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+.\" $OpenBSD: openssl.1,v 1.91 2012/09/26 16:19:44 jmc Exp $
+.\" ====================================================================
+.\" Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\" ====================================================================
+.\"
+.\" This product includes cryptographic software written by Eric Young
+.\" (eay@cryptsoft.com).  This product includes software written by Tim
+.\" Hudson (tjh@cryptsoft.com).
+.\"
+.\"
+.\" Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+.\" All rights reserved.
+.\"
+.\" This package is an SSL implementation written
+.\" by Eric Young (eay@cryptsoft.com).
+.\" The implementation was written so as to conform with Netscapes SSL.
+.\"
+.\" This library is free for commercial and non-commercial use as long as
+.\" the following conditions are aheared to.  The following conditions
+.\" apply to all code found in this distribution, be it the RC4, RSA,
+.\" lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+.\" included with this distribution is covered by the same copyright terms
+.\" except that the holder is Tim Hudson (tjh@cryptsoft.com).
+.\"
+.\" Copyright remains Eric Young's, and as such any Copyright notices in
+.\" the code are not to be removed.
+.\" If this package is used in a product, Eric Young should be given attribution
+.\" as the author of the parts of the library used.
+.\" This can be in the form of a textual message at program startup or
+.\" in documentation (online or textual) provided with the package.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"    "This product includes cryptographic software written by
+.\"     Eric Young (eay@cryptsoft.com)"
+.\"    The word 'cryptographic' can be left out if the rouines from the library
+.\"    being used are not cryptographic related :-).
+.\" 4. If you include any Windows specific code (or a derivative thereof) from
+.\"    the apps directory (application code) you must include an
+.\"    acknowledgement:
+.\"    "This product includes software written by Tim Hudson
+.\"     (tjh@cryptsoft.com)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" The licence and distribution terms for any publically available version or
+.\" derivative of this code cannot be changed.  i.e. this code cannot simply be
+.\" copied and put under another distribution licence
+.\" [including the GNU Public Licence.]
+.\"
+.\" OPENSSL
+.\"
+.Dd $Mdocdate: September 26 2012 $
+.Dt OPENSSL 1
+.Os
+.Sh NAME
+.Nm openssl
+.Nd OpenSSL command line tool
+.Sh SYNOPSIS
+.Nm
+.Cm command
+.Op Ar command_opts
+.Op Ar command_args
+.Pp
+.Nm
+.Cm list-standard-commands \*(Ba
+.Cm list-message-digest-commands \*(Ba
+.Cm list-cipher-commands \*(Ba
+.Cm list-cipher-algorithms \*(Ba
+.Cm list-message-digest-algorithms \*(Ba
+.Cm list-public-key-algorithms
+.Pp
+.Nm
+.Cm no- Ns Ar XXX
+.Op Ar arbitrary options
+.Sh DESCRIPTION
+.Nm OpenSSL
+is a cryptography toolkit implementing the Secure Sockets Layer
+.Pq SSL v3
+and Transport Layer Security
+.Pq TLS v1
+network protocols and related cryptography standards required by them.
+.Pp
+The
+.Nm
+program is a command line tool for using the various
+cryptography functions of
+.Nm OpenSSL Ns Li 's
+.Em crypto
+library from the shell.
+It can be used for
+.Pp
+.Bl -bullet -offset indent -compact
+.It
+Creation and management of private keys, public keys, and parameters
+.It
+Public key cryptographic operations
+.It
+Creation of X.509 certificates, CSRs and CRLs
+.It
+Calculation of Message Digests
+.It
+Encryption and Decryption with Ciphers
+.It
+SSL/TLS Client and Server Tests
+.It
+Handling of S/MIME signed or encrypted mail
+.It
+Time stamp requests, generation, and verification
+.El
+.Sh COMMAND SUMMARY
+The
+.Nm
+program provides a rich variety of commands
+.Pf ( Cm command
+in the
+.Sx SYNOPSIS
+above),
+each of which often has a wealth of options and arguments
+.Pf ( Ar command_opts
+and
+.Ar command_args
+in the
+.Sx SYNOPSIS ) .
+.Pp
+The pseudo-commands
+.Cm list-standard-commands , list-message-digest-commands ,
+and
+.Cm list-cipher-commands
+output a list
+.Pq one entry per line
+of the names of all standard commands, message digest commands,
+or cipher commands, respectively, that are available in the present
+.Nm
+utility.
+.Pp
+The pseudo-commands
+.Cm list-cipher-algorithms
+and
+.Cm list-message-digest-algorithms
+list all cipher and message digest names,
+one entry per line.
+Aliases are listed as:
+.Pp
+.D1 from =\*(Gt to
+.Pp
+The pseudo-command
+.Cm list-public-key-algorithms
+lists all supported public key algorithms.
+.Pp
+The pseudo-command
+.Cm no- Ns Ar XXX
+tests whether a command of the
+specified name is available.
+If no command named
+.Ar XXX
+exists,
+it returns 0
+.Pq success
+and prints
+.Cm no- Ns Ar XXX ;
+otherwise it returns 1 and prints
+.Ar XXX .
+In both cases, the output goes to
+.Em stdout
+and nothing is printed to
+.Em stderr .
+Additional command line arguments are always ignored.
+Since for each cipher there is a command of the same name,
+this provides an easy way for shell scripts to test for the
+availability of ciphers in the
+.Nm
+program.
+.Pp
+.Sy Note :
+.Cm no- Ns Ar XXX
+is not able to detect pseudo-commands such as
+.Cm quit ,
+.Cm list- Ns Ar ... Ns Cm -commands ,
+or
+.Cm no- Ns Ar XXX
+itself.
+.Sh STANDARD COMMANDS
+.Bl -tag -width "asn1parse"
+.It Cm asn1parse
+Parse an ASN.1 sequence.
+.It Cm ca
+Certificate Authority
+.Pq CA
+management.
+.It Cm ciphers
+Cipher suite description determination.
+.It Cm crl
+Certificate Revocation List
+.Pq CRL
+management.
+.It Cm crl2pkcs7
+CRL to PKCS#7 conversion.
+.It Cm dgst
+Message digest calculation.
+.It Cm dh
+Diffie-Hellman parameter management.
+Obsoleted by
+.Cm dhparam .
+.It Cm dhparam
+Generation and management of Diffie-Hellman parameters.
+Superseded by
+.Cm genpkey
+and
+.Cm pkeyparam .
+.It Cm dsa
+DSA data management.
+.It Cm dsaparam
+DSA parameter generation and management.
+Superseded by
+.Cm genpkey
+and
+.Cm pkeyparam .
+.It Cm ec
+Elliptic curve (EC) key processing.
+.It Cm ecparam
+EC parameter manipulation and generation.
+.It Cm enc
+Encoding with ciphers.
+.It Cm engine
+Engine (loadable module) information and manipulation.
+.It Cm errstr
+Error number to error string conversion.
+.It Cm gendh
+Generation of Diffie-Hellman parameters.
+Obsoleted by
+.Cm dhparam .
+.It Cm gendsa
+Generation of DSA private key from parameters.
+Superseded by
+.Cm genpkey
+and
+.Cm pkey .
+.It Cm genpkey
+Generation of private keys or parameters.
+.It Cm genrsa
+Generation of RSA private key.
+Superseded by
+.Cm genpkey .
+.It Cm nseq
+Create or examine a Netscape certificate sequence.
+.It Cm ocsp
+Online Certificate Status Protocol utility.
+.It Cm passwd
+Generation of hashed passwords.
+.It Cm pkcs7
+PKCS#7 data management.
+.It Cm pkcs8
+PKCS#8 data management.
+.It Cm pkcs12
+PKCS#12 data management.
+.It Cm pkey
+Public and private key management.
+.It Cm pkeyparam
+Public key algorithm parameter management.
+.It Cm pkeyutl
+Public key algorithm cryptographic operation utility.
+.It Cm prime
+Generate prime numbers or test numbers for primality.
+.It Cm rand
+Generate pseudo-random bytes.
+.It Cm req
+PKCS#10 X.509 Certificate Signing Request
+.Pq CSR
+management.
+.It Cm rsa
+RSA key management.
+.It Cm rsautl
+RSA utility for signing, verification, encryption, and decryption.
+Superseded by
+.Cm pkeyutl .
+.It Cm s_client
+This implements a generic SSL/TLS client which can establish a transparent
+connection to a remote server speaking SSL/TLS.
+It's intended for testing purposes only and provides only rudimentary
+interface functionality but internally uses mostly all functionality of the
+.Nm OpenSSL
+.Em ssl
+library.
+.It Cm s_server
+This implements a generic SSL/TLS server which accepts connections from remote
+clients speaking SSL/TLS.
+It's intended for testing purposes only and provides only rudimentary
+interface functionality but internally uses mostly all functionality of the
+.Nm OpenSSL
+.Em ssl
+library.
+It provides both an own command line oriented protocol for testing
+SSL functions and a simple HTTP response
+facility to emulate an SSL/TLS-aware webserver.
+.It Cm s_time
+SSL connection timer.
+.It Cm sess_id
+SSL session data management.
+.It Cm smime
+S/MIME mail processing.
+.It Cm speed
+Algorithm speed measurement.
+.It Cm spkac
+SPKAC printing and generating utility.
+.It Cm ts
+Time stamping authority tool (client/server).
+.It Cm verify
+X.509 certificate verification.
+.It Cm version
+.Nm OpenSSL
+version information.
+.It Cm x509
+X.509 certificate data management.
+.El
+.Sh MESSAGE DIGEST COMMANDS
+.Bl -tag -width "asn1parse"
+.It Cm md2
+MD2 digest.
+.It Cm md4
+MD4 digest.
+.It Cm md5
+MD5 digest.
+.It Cm ripemd160
+RIPEMD-160 digest.
+.It Cm sha
+SHA digest.
+.It Cm sha1
+SHA-1 digest.
+.El
+.Sh ENCODING AND CIPHER COMMANDS
+.Bl -tag -width Ds -compact
+.It Cm aes-128-cbc | aes-128-ecb | aes-192-cbc | aes-192-ecb
+.It Cm aes-256-cbc | aes-256-ecb
+AES cipher.
+.Pp
+.It Cm base64
+Base64 encoding.
+.Pp
+.It Xo
+.Cm bf | bf-cbc | bf-cfb |
+.Cm bf-ecb | bf-ofb
+.Xc
+Blowfish cipher.
+.Pp
+.It Cm cast | cast-cbc
+CAST cipher.
+.Pp
+.It Cm cast5-cbc | cast5-cfb | cast5-ecb | cast5-ofb
+CAST5 cipher.
+.Pp
+.It Xo
+.Cm des | des-cbc | des-cfb | des-ecb |
+.Cm des-ede | des-ede-cbc
+.Xc
+.It Cm des-ede-cfb | des-ede-ofb | des-ofb
+DES cipher.
+.Pp
+.It Xo
+.Cm des3 | desx | des-ede3 |
+.Cm des-ede3-cbc | des-ede3-cfb | des-ede3-ofb
+.Xc
+Triple DES cipher.
+.Pp
+.It Xo
+.Cm rc2 | rc2-40-cbc | rc2-64-cbc | rc2-cbc |
+.Cm rc2-cfb | rc2-ecb | rc2-ofb
+.Xc
+RC2 cipher.
+.Pp
+.It Cm rc4 | rc4-40
+RC4 cipher.
+.El
+.Sh PASS PHRASE ARGUMENTS
+Several commands accept password arguments, typically using
+.Fl passin
+and
+.Fl passout
+for input and output passwords, respectively.
+These allow the password to be obtained from a variety of sources.
+Both of these options take a single argument whose format is described below.
+If no password argument is given and a password is required,
+then the user is prompted to enter one:
+this will typically be read from the current terminal with echoing turned off.
+.Bl -tag -width "fd:number"
+.It Ar pass : Ns Ar password
+The actual password is
+.Ar password .
+Since the password is visible to utilities
+(like
+.Xr ps 1
+under
+.Ux )
+this form should only be used where security is not important.
+.It Ar env : Ns Ar var
+Obtain the password from the environment variable
+.Ar var .
+Since the environment of other processes is visible on certain platforms
+(e.g.\&
+.Xr ps 1
+under certain
+.Ux
+OSes) this option should be used with caution.
+.It Ar file : Ns Ar path
+The first line of
+.Ar path
+is the password.
+If the same
+.Ar path
+argument is supplied to
+.Fl passin
+and
+.Fl passout ,
+then the first line will be used for the input password and the next line
+for the output password.
+.Ar path
+need not refer to a regular file:
+it could, for example, refer to a device or named pipe.
+.It Ar fd : Ns Ar number
+Read the password from the file descriptor
+.Ar number .
+This can be used to send the data via a pipe for example.
+.It Ar stdin
+Read the password from standard input.
+.El
+.\"
+.\" ASN1PARSE
+.\"
+.Sh ASN1PARSE
+.nr nS 1
+.Nm "openssl asn1parse"
+.Bk -words
+.Op Fl i
+.Op Fl dlimit Ar number
+.Op Fl dump
+.Op Fl genconf Ar file
+.Op Fl genstr Ar str
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM | TXT
+.Op Fl length Ar number
+.Op Fl noout
+.Op Fl offset Ar number
+.Op Fl oid Ar file
+.Op Fl out Ar file
+.Op Fl strparse Ar offset
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm asn1parse
+command is a diagnostic utility that can parse ASN.1 structures.
+It can also be used to extract data from ASN.1 formatted data.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl dlimit Ar number
+Dump the first
+.Ar number
+bytes of unknown data in hex form.
+.It Fl dump
+Dump unknown data in hex form.
+.It Fl genconf Ar file , Fl genstr Ar str
+Generate encoded data based on string
+.Ar str ,
+file
+.Ar file ,
+or both using
+.Xr ASN1_generate_nconf 3
+format.
+If only
+.Ar file
+is present then the string is obtained from the default section
+using the name
+.Dq asn1 .
+The encoded data is passed through the ASN1 parser and printed out as
+though it came from a file;
+the contents can thus be examined and written to a file using the
+.Fl out
+option.
+.It Fl i
+Indents the output according to the
+.Qq depth
+of the structures.
+.It Fl in Ar file
+The input file; default is standard input.
+.It Fl inform Ar DER | PEM | TXT
+The input format.
+.Ar DER
+.Pq Distinguished Encoding Rules
+is binary format and
+.Ar PEM
+.Pq Privacy Enhanced Mail ,
+the default, is base64-encoded.
+.Ar TXT
+is plain text.
+.It Fl length Ar number
+Number of bytes to parse; default is until end of file.
+.It Fl noout
+Don't output the parsed version of the input file.
+.It Fl offset Ar number
+Starting offset to begin parsing; default is start of file.
+.It Fl oid Ar file
+A file containing additional object identifiers
+.Pq OIDs .
+The format of this file is described in the
+.Sx ASN1PARSE NOTES
+section below.
+.It Fl out Ar file
+Output file to place the DER-encoded data into.
+If this option is not present, no encoded data will be output.
+This is most useful when combined with the
+.Fl strparse
+option.
+.It Fl strparse Ar offset
+Parse the content octets of the ASN.1 object starting at
+.Ar offset .
+This option can be used multiple times to
+.Qq drill down
+into a nested structure.
+.El
+.Sh ASN1PARSE OUTPUT
+The output will typically contain lines like this:
+.Bd -literal -offset 2n
+0:d=0  hl=4 l= 681 cons: SEQUENCE
+
+\&.....
+
+229:d=3  hl=3 l= 141 prim: BIT STRING
+373:d=2  hl=3 l= 162 cons: cont [ 3 ]
+376:d=3  hl=3 l= 159 cons: SEQUENCE
+379:d=4  hl=2 l=  29 cons: SEQUENCE
+381:d=5  hl=2 l=   3 prim: OBJECT        :X509v3 Subject Key Identifier
+386:d=5  hl=2 l=  22 prim: OCTET STRING
+410:d=4  hl=2 l= 112 cons: SEQUENCE
+412:d=5  hl=2 l=   3 prim: OBJECT        :X509v3 Authority Key Identifier
+417:d=5  hl=2 l= 105 prim: OCTET STRING
+524:d=4  hl=2 l=  12 cons: SEQUENCE
+
+\&.....
+.Ed
+.Pp
+This example is part of a self-signed certificate.
+Each line starts with the offset in decimal.
+.Cm d=XX
+specifies the current depth.
+The depth is increased within the scope of any SET or SEQUENCE.
+.Cm hl=XX
+gives the header length
+.Pq tag and length octets
+of the current type.
+.Cm l=XX
+gives the length of the content octets.
+.Pp
+The
+.Fl i
+option can be used to make the output more readable.
+.Pp
+Some knowledge of the ASN.1 structure is needed to interpret the output.
+.Pp
+In this example, the BIT STRING at offset 229 is the certificate public key.
+The content octets of this will contain the public key information.
+This can be examined using the option
+.Fl strparse Cm 229
+to yield:
+.Bd -literal
+    0:d=0  hl=3 l= 137 cons: SEQUENCE
+    3:d=1  hl=3 l= 129 prim: INTEGER           :E5D21E1F5C8D208EA7A2166C7FA
+F9F6BDF2059669C60876DDB70840F1A5AAFA59699FE471F379F1DD6A487E7D5409AB6A88D4A
+9746E24B91D8CF55DB3521015460C8EDE44EE8A4189F7A7BE77D6CD3A9AF2696F486855CF58
+BF0EDF2B4068058C7A947F52548DDF7E15E96B385F86422BEA9064A3EE9
+  135:d=1  hl=2 l=   3 prim: INTEGER           :010001
+.Ed
+.Sh ASN1PARSE NOTES
+If an OID
+.Pq object identifier
+is not part of
+.Nm OpenSSL Ns Li 's
+internal table it will be represented in
+numerical form
+.Pq for example 1.2.3.4 .
+The file passed to the
+.Fl oid
+option allows additional OIDs to be included.
+Each line consists of three columns:
+the first column is the OID in numerical format and should be followed by
+whitespace.
+The second column is the
+.Qq short name
+which is a single word followed by whitespace.
+The final column is the rest of the line and is the
+.Qq long name .
+.Nm asn1parse
+displays the long name.
+Example:
+.Pp
+.Dl \&"1.2.3.4  shortname       A long name\&"
+.Sh ASN1 EXAMPLES
+Parse a file:
+.Pp
+.Dl $ openssl asn1parse -in file.pem
+.Pp
+Parse a DER file:
+.Pp
+.Dl $ openssl asn1parse -inform DER -in file.der
+.Sh ASN1PARSE BUGS
+There should be options to change the format of output lines.
+The output of some ASN.1 types is not well handled
+.Pq if at all .
+.\"
+.\" CA
+.\"
+.Sh CA
+.nr nS 1
+.Nm "openssl ca"
+.Bk -words
+.Op Fl batch
+.Op Fl cert Ar file
+.Op Fl config Ar file
+.Op Fl crl_CA_compromise Ar time
+.Op Fl crl_compromise Ar time
+.Op Fl crl_hold Ar instruction
+.Op Fl crl_reason Ar reason
+.Op Fl crldays Ar days
+.Op Fl crlexts Ar section
+.Op Fl crlhours Ar hours
+.Op Fl days Ar arg
+.Op Fl enddate Ar date
+.Op Fl engine Ar id
+.Op Fl extensions Ar section
+.Op Fl extfile Ar section
+.Op Fl gencrl
+.Op Fl in Ar file
+.Op Fl infiles
+.Op Fl key Ar keyfile
+.Op Fl keyfile Ar arg
+.Op Fl keyform Ar ENGINE | PEM
+.Op Fl md Ar arg
+.Op Fl msie_hack
+.Op Fl name Ar section
+.Op Fl noemailDN
+.Op Fl notext
+.Op Fl out Ar file
+.Op Fl outdir Ar dir
+.Op Fl passin Ar arg
+.Op Fl policy Ar arg
+.Op Fl preserveDN
+.Op Fl revoke Ar file
+.Op Fl spkac Ar file
+.Op Fl ss_cert Ar file
+.Op Fl startdate Ar date
+.Op Fl status Ar serial
+.Op Fl subj Ar arg
+.Op Fl updatedb
+.Op Fl verbose
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm ca
+command is a minimal CA application.
+It can be used to sign certificate requests in a variety of forms
+and generate CRLs.
+It also maintains a text database of issued certificates and their status.
+.Pp
+The options descriptions will be divided into each purpose.
+.Sh CA OPTIONS
+.Bl -tag -width "XXXX"
+.It Fl batch
+This sets the batch mode.
+In this mode no questions will be asked
+and all certificates will be certified automatically.
+.It Fl cert Ar file
+The CA certificate file.
+.It Fl config Ar file
+Specifies the configuration file to use.
+.It Fl days Ar arg
+The number of days to certify the certificate for.
+.It Fl enddate Ar date
+This allows the expiry date to be explicitly set.
+The format of the date is YYMMDDHHMMSSZ
+.Pq the same as an ASN1 UTCTime structure .
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm ca
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl extensions Ar section
+The section of the configuration file containing certificate extensions
+to be added when a certificate is issued (defaults to
+.Em x509_extensions
+unless the
+.Fl extfile
+option is used).
+If no extension section is present, a V1 certificate is created.
+If the extension section is present
+.Pq even if it is empty ,
+then a V3 certificate is created.
+.It Fl extfile Ar file
+An additional configuration
+.Ar file
+to read certificate extensions from
+(using the default section unless the
+.Fl extensions
+option is also used).
+.It Fl in Ar file
+An input
+.Ar file
+containing a single certificate request to be signed by the CA.
+.It Fl infiles
+If present, this should be the last option; all subsequent arguments
+are assumed to be the names of files containing certificate requests.
+.It Fl key Ar keyfile
+The password used to encrypt the private key.
+Since on some systems the command line arguments are visible
+(e.g.\&
+.Ux
+with the
+.Xr ps 1
+utility) this option should be used with caution.
+.It Fl keyfile Ar file
+The private key to sign requests with.
+.It Fl keyform Ar ENGINE | PEM
+Private key file format.
+.It Fl md Ar alg
+The message digest to use.
+Possible values include
+.Ar md5
+and
+.Ar sha1 .
+This option also applies to CRLs.
+.It Fl msie_hack
+This is a legacy option to make
+.Nm ca
+work with very old versions of the IE certificate enrollment control
+.Qq certenr3 .
+It used UniversalStrings for almost everything.
+Since the old control has various security bugs,
+its use is strongly discouraged.
+The newer control
+.Qq Xenroll
+does not need this option.
+.It Fl name Ar section
+Specifies the configuration file
+.Ar section
+to use (overrides
+.Cm default_ca
+in the
+.Cm ca
+section).
+.It Fl noemailDN
+The DN of a certificate can contain the EMAIL field if present in the
+request DN, however it is good policy just having the e-mail set into
+the
+.Em altName
+extension of the certificate.
+When this option is set, the EMAIL field is removed from the certificate's
+subject and set only in the, eventually present, extensions.
+The
+.Ar email_in_dn
+keyword can be used in the configuration file to enable this behaviour.
+.It Fl notext
+Don't output the text form of a certificate to the output file.
+.It Fl out Ar file
+The output file to output certificates to.
+The default is standard output.
+The certificate details will also be printed out to this file.
+.It Fl outdir Ar directory
+The
+.Ar directory
+to output certificates to.
+The certificate will be written to a file consisting of the
+serial number in hex with
+.Qq .pem
+appended.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl policy Ar arg
+This option defines the CA
+.Qq policy
+to use.
+This is a section in the configuration file which decides which fields
+should be mandatory or match the CA certificate.
+Check out the
+.Sx CA POLICY FORMAT
+section for more information.
+.It Fl preserveDN
+Normally, the DN order of a certificate is the same as the order of the
+fields in the relevant policy section.
+When this option is set, the order is the same as the request.
+This is largely for compatibility with the older IE enrollment control
+which would only accept certificates if their DNs matched the order of the
+request.
+This is not needed for Xenroll.
+.It Fl spkac Ar file
+A file containing a single Netscape signed public key and challenge,
+and additional field values to be signed by the CA.
+See the
+.Sx SPKAC FORMAT
+section for information on the required format.
+.It Fl ss_cert Ar file
+A single self-signed certificate to be signed by the CA.
+.It Fl startdate Ar date
+This allows the start date to be explicitly set.
+The format of the date is YYMMDDHHMMSSZ
+.Pq the same as an ASN1 UTCTime structure .
+.It Fl status Ar serial
+Show status of certificate with serial number
+.Ar serial .
+.It Fl updatedb
+Update database for expired certificates.
+.It Fl verbose
+This prints extra details about the operations being performed.
+.El
+.Sh CRL OPTIONS
+.Bl -tag -width "XXXX"
+.It Fl crl_CA_compromise Ar time
+This is the same as
+.Fl crl_compromise ,
+except the revocation reason is set to CACompromise.
+.It Fl crl_compromise Ar time
+This sets the revocation reason to keyCompromise and the compromise time to
+.Ar time .
+.Ar time
+should be in GeneralizedTime format, i.e. YYYYMMDDHHMMSSZ.
+.It Fl crl_hold Ar instruction
+This sets the CRL revocation reason code to certificateHold and the hold
+instruction to
+.Ar instruction
+which must be an OID.
+Although any OID can be used, only holdInstructionNone
+(the use of which is discouraged by RFC 2459), holdInstructionCallIssuer or
+holdInstructionReject will normally be used.
+.It Fl crl_reason Ar reason
+Revocation reason, where
+.Ar reason
+is one of:
+unspecified, keyCompromise, CACompromise, affiliationChanged, superseded,
+cessationOfOperation, certificateHold or removeFromCRL.
+The matching of
+.Ar reason
+is case insensitive.
+Setting any revocation reason will make the CRL v2.
+In practice, removeFromCRL is not particularly useful because it is only used
+in delta CRLs which are not currently implemented.
+.It Fl crldays Ar num
+The number of days before the next CRL is due.
+This is the days from now to place in the CRL
+.Em nextUpdate
+field.
+.It Fl crlexts Ar section
+The
+.Ar section
+of the configuration file containing CRL extensions to include.
+If no CRL extension section is present then a V1 CRL is created;
+if the CRL extension section is present
+.Pq even if it is empty
+then a V2 CRL is created.
+The CRL extensions specified are CRL extensions and
+.Em not
+CRL entry extensions.
+It should be noted that some software
+.Pq for example Netscape
+can't handle V2 CRLs.
+.It Fl crlhours Ar num
+The number of hours before the next CRL is due.
+.It Fl gencrl
+This option generates a CRL based on information in the index file.
+.It Fl revoke Ar file
+A
+.Ar file
+containing a certificate to revoke.
+.It Fl subj Ar arg
+Supersedes the subject name given in the request.
+The
+.Ar arg
+must be formatted as
+.Ar /type0=value0/type1=value1/type2=... ;
+characters may be escaped by
+.Sq \e
+.Pq backslash ,
+no spaces are skipped.
+.El
+.Sh CA CONFIGURATION FILE OPTIONS
+The section of the configuration file containing options for
+.Nm ca
+is found as follows:
+If the
+.Fl name
+command line option is used, then it names the section to be used.
+Otherwise the section to be used must be named in the
+.Em default_ca
+option of the
+.Em ca
+section of the configuration file (or in the default section of the
+configuration file).
+Besides
+.Em default_ca ,
+the following options are read directly from the
+.Em ca
+section:
+.Pp
+.Bl -tag -width Ds -offset indent -compact
+.It RANDFILE
+.It preserve
+.It msie_hack
+.El
+.Pp
+With the exception of RANDFILE, this is probably a bug and may
+change in future releases.
+.Pp
+Many of the configuration file options are identical to command line
+options.
+Where the option is present in the configuration file and the command line,
+the command line value is used.
+Where an option is described as mandatory, then it must be present in
+the configuration file or the command line equivalent
+.Pq if any
+used.
+.Bl -tag -width "XXXX"
+.It Ar certificate
+The same as
+.Fl cert .
+It gives the file containing the CA certificate.
+Mandatory.
+.It Ar copy_extensions
+Determines how extensions in certificate requests should be handled.
+If set to
+.Ar none
+or this option is not present, then extensions are
+ignored and not copied to the certificate.
+If set to
+.Ar copy ,
+then any extensions present in the request that are not already present
+are copied to the certificate.
+If set to
+.Ar copyall ,
+then all extensions in the request are copied to the certificate:
+if the extension is already present in the certificate it is deleted first.
+See the
+.Sx CA WARNINGS
+section before using this option.
+.Pp
+The main use of this option is to allow a certificate request to supply
+values for certain extensions such as
+.Em subjectAltName .
+.It Ar crl_extensions
+The same as
+.Fl crlexts .
+.It Ar crlnumber
+A text file containing the next CRL number to use in hex.
+The CRL number will be inserted in the CRLs only if this file exists.
+If this file is present, it must contain a valid CRL number.
+.It Ar database
+The text database file to use.
+Mandatory.
+This file must be present, though initially it will be empty.
+.It Ar default_crl_hours , default_crl_days
+The same as the
+.Fl crlhours
+and
+.Fl crldays
+options.
+These will only be used if neither command line option is present.
+At least one of these must be present to generate a CRL.
+.It Ar default_days
+The same as the
+.Fl days
+option.
+The number of days to certify a certificate for.
+.It Ar default_enddate
+The same as the
+.Fl enddate
+option.
+Either this option or
+.Ar default_days
+.Pq or the command line equivalents
+must be present.
+.It Ar default_md
+The same as the
+.Fl md
+option.
+The message digest to use.
+Mandatory.
+.It Ar default_startdate
+The same as the
+.Fl startdate
+option.
+The start date to certify a certificate for.
+If not set, the current time is used.
+.It Ar email_in_dn
+The same as
+.Fl noemailDN .
+If the EMAIL field is to be removed from the DN of the certificate,
+simply set this to
+.Qq no .
+If not present, the default is to allow for the EMAIL field in the
+certificate's DN.
+.It Ar msie_hack
+The same as
+.Fl msie_hack .
+.It Ar name_opt , cert_opt
+These options allow the format used to display the certificate details
+when asking the user to confirm signing.
+All the options supported by the
+.Nm x509
+utilities'
+.Fl nameopt
+and
+.Fl certopt
+switches can be used here, except that
+.Ar no_signame
+and
+.Ar no_sigdump
+are permanently set and cannot be disabled
+(this is because the certificate signature cannot be displayed because
+the certificate has not been signed at this point).
+.Pp
+For convenience, the value
+.Em ca_default
+is accepted by both to produce a reasonable output.
+.Pp
+If neither option is present, the format used in earlier versions of
+.Nm OpenSSL
+is used.
+Use of the old format is
+.Em strongly
+discouraged because it only displays fields mentioned in the
+.Ar policy
+section,
+mishandles multicharacter string types and does not display extensions.
+.It Ar new_certs_dir
+The same as the
+.Fl outdir
+command line option.
+It specifies the directory where new certificates will be placed.
+Mandatory.
+.It Ar oid_file
+This specifies a file containing additional object identifiers.
+Each line of the file should consist of the numerical form of the
+object identifier followed by whitespace, then the short name followed
+by whitespace and finally the long name.
+.It Ar oid_section
+This specifies a section in the configuration file containing extra
+object identifiers.
+Each line should consist of the short name of the object identifier
+followed by
+.Sq =
+and the numerical form.
+The short and long names are the same when this option is used.
+.It Ar policy
+The same as
+.Fl policy .
+Mandatory.
+See the
+.Sx CA POLICY FORMAT
+section for more information.
+.It Ar preserve
+The same as
+.Fl preserveDN .
+.It Ar private_key
+Same as the
+.Fl keyfile
+option.
+The file containing the CA private key.
+Mandatory.
+.It Ar RANDFILE
+A file used to read and write random number seed information,
+or an EGD socket (see
+.Xr RAND_egd 3 ) .
+.It Ar serial
+A text file containing the next serial number to use in hex.
+Mandatory.
+This file must be present and contain a valid serial number.
+.It Ar unique_subject
+If the value
+.Ar yes
+is given, the valid certificate entries in the
+database must have unique subjects.
+If the value
+.Ar no
+is given,
+several valid certificate entries may have the exact same subject.
+The default value is
+.Ar yes .
+.It Ar x509_extensions
+The same as
+.Fl extensions .
+.El
+.Sh CA POLICY FORMAT
+The policy section consists of a set of variables corresponding to
+certificate DN fields.
+If the value is
+.Qq match ,
+then the field value must match the same field in the CA certificate.
+If the value is
+.Qq supplied ,
+then it must be present.
+If the value is
+.Qq optional ,
+then it may be present.
+Any fields not mentioned in the policy section
+are silently deleted, unless the
+.Fl preserveDN
+option is set,
+but this can be regarded more of a quirk than intended behaviour.
+.Sh SPKAC FORMAT
+The input to the
+.Fl spkac
+command line option is a Netscape signed public key and challenge.
+This will usually come from the
+.Em KEYGEN
+tag in an HTML form to create a new private key.
+It is, however, possible to create SPKACs using the
+.Nm spkac
+utility.
+.Pp
+The file should contain the variable SPKAC set to the value of
+the SPKAC and also the required DN components as name value pairs.
+If it's necessary to include the same component twice,
+then it can be preceded by a number and a
+.Sq \&. .
+.Sh CA EXAMPLES
+.Sy Note :
+these examples assume that the
+.Nm ca
+directory structure is already set up and the relevant files already exist.
+This usually involves creating a CA certificate and private key with
+.Cm req ,
+a serial number file and an empty index file and placing them in
+the relevant directories.
+.Pp
+To use the sample configuration file below, the directories
+.Pa demoCA ,
+.Pa demoCA/private
+and
+.Pa demoCA/newcerts
+would be created.
+The CA certificate would be copied to
+.Pa demoCA/cacert.pem
+and its private key to
+.Pa demoCA/private/cakey.pem .
+A file
+.Pa demoCA/serial
+would be created containing, for example,
+.Qq 01
+and the empty index file
+.Pa demoCA/index.txt .
+.Pp
+Sign a certificate request:
+.Pp
+.Dl $ openssl ca -in req.pem -out newcert.pem
+.Pp
+Sign a certificate request, using CA extensions:
+.Pp
+.Dl $ openssl ca -in req.pem -extensions v3_ca -out newcert.pem
+.Pp
+Generate a CRL:
+.Pp
+.Dl $ openssl ca -gencrl -out crl.pem
+.Pp
+Sign several requests:
+.Pp
+.Dl $ openssl ca -infiles req1.pem req2.pem req3.pem
+.Pp
+Certify a Netscape SPKAC:
+.Pp
+.Dl $ openssl ca -spkac spkac.txt
+.Pp
+A sample SPKAC file
+.Pq the SPKAC line has been truncated for clarity :
+.Bd -literal -offset indent
+SPKAC=MIG0MGAwXDANBgkqhkiG9w0BAQEFAANLADBIAkEAn7PDhCeV/xIxUg8V70YRxK
+CN=Steve Test
+emailAddress=steve@openssl.org
+0.OU=OpenSSL Group
+1.OU=Another Group
+.Ed
+.Pp
+A sample configuration file with the relevant sections for
+.Nm ca :
+.Bd -literal
+\& [ ca ]
+\& default_ca      = CA_default            # The default ca section
+
+\& [ CA_default ]
+
+\& dir            = ./demoCA              # top dir
+\& database       = $dir/index.txt        # index file
+\& new_certs_dir  = $dir/newcerts         # new certs dir
+
+\& certificate    = $dir/cacert.pem       # The CA cert
+\& serial         = $dir/serial           # serial no file
+\& private_key    = $dir/private/cakey.pem# CA private key
+\& RANDFILE       = $dir/private/.rand    # random number file
+
+\& default_days   = 365                   # how long to certify for
+\& default_crl_days= 30                   # how long before next CRL
+\& default_md     = md5                   # md to use
+
+\& policy         = policy_any            # default policy
+\& email_in_dn    = no                    # Don't add the email into cert DN
+
+\& name_opt        = ca_default           # Subject name display option
+\& cert_opt        = ca_default           # Certificate display option
+\& copy_extensions = none                 #Don't copy extensions from request
+
+\& [ policy_any ]
+\& countryName            = supplied
+\& stateOrProvinceName    = optional
+\& organizationName       = optional
+\& organizationalUnitName = optional
+\& commonName             = supplied
+\& emailAddress           = optional
+.Ed
+.Sh CA FILES
+.Sy Note :
+the location of all files can change either by compile time options,
+configuration file entries, environment variables, or command line options.
+The values below reflect the default values.
+.Bd -literal -offset indent
+/etc/ssl/openssl.cnf           - master configuration file
+\&./demoCA                       - main CA directory
+\&./demoCA/cacert.pem            - CA certificate
+\&./demoCA/private/cakey.pem     - CA private key
+\&./demoCA/serial                - CA serial number file
+\&./demoCA/serial.old            - CA serial number backup file
+\&./demoCA/index.txt             - CA text database file
+\&./demoCA/index.txt.old         - CA text database backup file
+\&./demoCA/certs                 - certificate output file
+\&./demoCA/.rnd                  - CA random seed information
+.Ed
+.Sh CA ENVIRONMENT VARIABLES
+.Ev OPENSSL_CONF
+reflects the location of the master configuration file;
+it can be overridden by the
+.Fl config
+command line option.
+.Sh CA RESTRICTIONS
+The text database index file is a critical part of the process,
+and if corrupted it can be difficult to fix.
+It is theoretically possible to rebuild the index file from all the
+issued certificates and a current CRL; however there is no option to do this.
+.Pp
+V2 CRL features like delta CRLs are not currently supported.
+.Pp
+Although several requests can be input and handled at once, it is only
+possible to include one SPKAC or self-signed certificate.
+.Sh CA BUGS
+The use of an in-memory text database can cause problems when large
+numbers of certificates are present because, as the name implies,
+the database has to be kept in memory.
+.Pp
+It is not possible to certify two certificates with the same DN; this
+is a side effect of how the text database is indexed and it cannot easily
+be fixed without introducing other problems.
+Some S/MIME clients can use two certificates with the same DN for separate
+signing and encryption keys.
+.Pp
+The
+.Nm ca
+command really needs rewriting or the required functionality
+exposed at either a command or interface level so a more friendly utility
+.Pq perl script or GUI
+can handle things properly.
+The scripts
+.Nm CA.sh
+and
+.Nm CA.pl
+help a little but not very much.
+.Pp
+Any fields in a request that are not present in a policy are silently
+deleted.
+This does not happen if the
+.Fl preserveDN
+option is used.
+To enforce the absence of the EMAIL field within the DN, as suggested
+by RFCs, regardless of the contents of the request's subject the
+.Fl noemailDN
+option can be used.
+The behaviour should be more friendly and configurable.
+.Pp
+Cancelling some commands by refusing to certify a certificate can
+create an empty file.
+.Sh CA WARNINGS
+The
+.Nm ca
+command is quirky and at times downright unfriendly.
+.Pp
+The
+.Nm ca
+utility was originally meant as an example of how to do things in a CA.
+It was not supposed to be used as a full blown CA itself:
+nevertheless some people are using it for this purpose.
+.Pp
+The
+.Nm ca
+command is effectively a single user command: no locking is done on the
+various files, and attempts to run more than one
+.Nm ca
+command on the same database can have unpredictable results.
+.Pp
+The
+.Ar copy_extensions
+option should be used with caution.
+If care is not taken, it can be a security risk.
+For example, if a certificate request contains a
+.Em basicConstraints
+extension with CA:TRUE and the
+.Ar copy_extensions
+value is set to
+.Ar copyall
+and the user does not spot
+this when the certificate is displayed, then this will hand the requestor
+a valid CA certificate.
+.Pp
+This situation can be avoided by setting
+.Ar copy_extensions
+to
+.Ar copy
+and including
+.Em basicConstraints
+with CA:FALSE in the configuration file.
+Then if the request contains a
+.Em basicConstraints
+extension, it will be ignored.
+.Pp
+It is advisable to also include values for other extensions such
+as
+.Ar keyUsage
+to prevent a request supplying its own values.
+.Pp
+Additional restrictions can be placed on the CA certificate itself.
+For example if the CA certificate has:
+.Pp
+.D1 basicConstraints = CA:TRUE, pathlen:0
+.Pp
+then even if a certificate is issued with CA:TRUE it will not be valid.
+.\"
+.\" CIPHERS
+.\"
+.Sh CIPHERS
+.Nm openssl ciphers
+.Op Fl hVv
+.Op Fl ssl3 | tls1
+.Op Ar cipherlist
+.Pp
+The
+.Nm ciphers
+command converts
+.Nm OpenSSL
+cipher lists into ordered SSL cipher preference lists.
+It can be used as a test tool to determine the appropriate cipherlist.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl h , \&?
+Print a brief usage message.
+.It Fl ssl3
+Only include SSL v3 ciphers.
+.It Fl tls1
+Only include TLS v1 ciphers.
+.It Fl V
+Like
+.Fl v ,
+but include cipher suite codes in output (hex format).
+.It Fl v
+Verbose option.
+List ciphers with a complete description of protocol version
+.Pq SSLv3, which includes TLS ,
+key exchange, authentication, encryption and mac algorithms used along with
+any key size restrictions and whether the algorithm is classed as an
+.Em export
+cipher.
+Note that without the
+.Fl v
+option, ciphers may seem to appear twice in a cipher list;
+this is when similar ciphers are available for SSL v3/TLS v1.
+.It Ar cipherlist
+A cipher list to convert to a cipher preference list.
+If it is not included, the default cipher list will be used.
+The format is described below.
+.El
+.Sh CIPHERS LIST FORMAT
+The cipher list consists of one or more
+.Em cipher strings
+separated by colons.
+Commas or spaces are also acceptable separators, but colons are normally used.
+.Pp
+The actual
+.Em cipher string
+can take several different forms:
+.Pp
+It can consist of a single cipher suite such as
+.Em RC4-SHA .
+.Pp
+It can represent a list of cipher suites containing a certain algorithm,
+or cipher suites of a certain type.
+For example
+.Em SHA1
+represents all cipher suites using the digest algorithm SHA1, and
+.Em SSLv3
+represents all SSL v3 algorithms.
+.Pp
+Lists of cipher suites can be combined in a single
+.Em cipher string
+using the
+.Sq +
+character.
+This is used as a logical
+.Em and
+operation.
+For example,
+.Em SHA1+DES
+represents all cipher suites containing the SHA1 and the DES algorithms.
+.Pp
+Each cipher string can be optionally preceded by the characters
+.Sq \&! ,
+.Sq - ,
+or
+.Sq + .
+.Pp
+If
+.Sq !\&
+is used, then the ciphers are permanently deleted from the list.
+The ciphers deleted can never reappear in the list even if they are
+explicitly stated.
+.Pp
+If
+.Sq -
+is used, then the ciphers are deleted from the list, but some or
+all of the ciphers can be added again by later options.
+.Pp
+If
+.Sq +
+is used, then the ciphers are moved to the end of the list.
+This option doesn't add any new ciphers, it just moves matching existing ones.
+.Pp
+If none of these characters is present, the string is just interpreted
+as a list of ciphers to be appended to the current preference list.
+If the list includes any ciphers already present, they will be ignored;
+that is, they will not be moved to the end of the list.
+.Pp
+Additionally, the cipher string
+.Em @STRENGTH
+can be used at any point to sort the current cipher list in order of
+encryption algorithm key length.
+.Sh CIPHERS STRINGS
+The following is a list of all permitted cipher strings and their meanings.
+.Bl -tag -width "XXXX"
+.It Ar DEFAULT
+The default cipher list.
+This is determined at compile time and is currently
+.Ar ALL:!aNULL:!eNULL:!SSLv2 .
+This must be the first
+.Ar cipher string
+specified.
+.It Ar COMPLEMENTOFDEFAULT
+The ciphers included in
+.Ar ALL ,
+but not enabled by default.
+Currently this is
+.Ar ADH .
+Note that this rule does not cover
+.Ar eNULL ,
+which is not included by
+.Ar ALL
+(use
+.Ar COMPLEMENTOFALL
+if necessary).
+.It Ar ALL
+All cipher suites except the
+.Ar eNULL
+ciphers which must be explicitly enabled.
+.It Ar COMPLEMENTOFALL
+The cipher suites not enabled by
+.Ar ALL ,
+currently being
+.Ar eNULL .
+.It Ar HIGH
+.Qq High
+encryption cipher suites.
+This currently means those with key lengths larger than 128 bits.
+.It Ar MEDIUM
+.Qq Medium
+encryption cipher suites, currently those using 128-bit encryption.
+.It Ar LOW
+.Qq Low
+encryption cipher suites, currently those using 64- or 56-bit encryption
+algorithms, but excluding export cipher suites.
+.It Ar EXP , EXPORT
+Export encryption algorithms.
+Including 40- and 56-bit algorithms.
+.It Ar EXPORT40
+40-bit export encryption algorithms.
+.It Ar eNULL , NULL
+The
+.Qq NULL
+ciphers; that is, those offering no encryption.
+Because these offer no encryption at all and are a security risk,
+they are disabled unless explicitly included.
+.It Ar aNULL
+The cipher suites offering no authentication.
+This is currently the anonymous DH algorithms.
+These cipher suites are vulnerable to a
+.Qq man in the middle
+attack, so their use is normally discouraged.
+.It Ar kRSA , RSA
+Cipher suites using RSA key exchange.
+.It Ar kEDH
+Cipher suites using ephemeral DH key agreement.
+.It Ar aRSA
+Cipher suites using RSA authentication, i.e. the certificates carry RSA keys.
+.It Ar aDSS , DSS
+Cipher suites using DSS authentication, i.e. the certificates carry DSS keys.
+.It Ar TLSv1 , SSLv3
+TLS v1.0 or SSL v3.0 cipher suites, respectively.
+.It Ar DH
+Cipher suites using DH, including anonymous DH.
+.It Ar ADH
+Anonymous DH cipher suites.
+.It Ar AES
+Cipher suites using AES.
+.It Ar 3DES
+Cipher suites using triple DES.
+.It Ar DES
+Cipher suites using DES
+.Pq not triple DES .
+.It Ar RC4
+Cipher suites using RC4.
+.It Ar RC2
+Cipher suites using RC2.
+.It Ar MD5
+Cipher suites using MD5.
+.It Ar SHA1 , SHA
+Cipher suites using SHA1.
+.El
+.Sh CIPHERS SUITE NAMES
+The following lists give the SSL or TLS cipher suites names from the
+relevant specification and their
+.Nm OpenSSL
+equivalents.
+It should be noted that several cipher suite names do not include the
+authentication used, e.g. DES-CBC3-SHA.
+In these cases, RSA authentication is used.
+.Ss SSL v3.0 cipher suites
+.Bd -unfilled -offset indent
+SSL_RSA_WITH_NULL_MD5                   NULL-MD5
+SSL_RSA_WITH_NULL_SHA                   NULL-SHA
+SSL_RSA_EXPORT_WITH_RC4_40_MD5          EXP-RC4-MD5
+SSL_RSA_WITH_RC4_128_MD5                RC4-MD5
+SSL_RSA_WITH_RC4_128_SHA                RC4-SHA
+SSL_RSA_EXPORT_WITH_RC2_CBC_40_MD5      EXP-RC2-CBC-MD5
+SSL_RSA_WITH_IDEA_CBC_SHA               IDEA-CBC-SHA
+SSL_RSA_EXPORT_WITH_DES40_CBC_SHA       EXP-DES-CBC-SHA
+SSL_RSA_WITH_DES_CBC_SHA                DES-CBC-SHA
+SSL_RSA_WITH_3DES_EDE_CBC_SHA           DES-CBC3-SHA
+
+SSL_DH_DSS_EXPORT_WITH_DES40_CBC_SHA    Not implemented.
+SSL_DH_DSS_WITH_DES_CBC_SHA             Not implemented.
+SSL_DH_DSS_WITH_3DES_EDE_CBC_SHA        Not implemented.
+SSL_DH_RSA_EXPORT_WITH_DES40_CBC_SHA    Not implemented.
+SSL_DH_RSA_WITH_DES_CBC_SHA             Not implemented.
+SSL_DH_RSA_WITH_3DES_EDE_CBC_SHA        Not implemented.
+SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-DSS-DES-CBC-SHA
+SSL_DHE_DSS_WITH_DES_CBC_SHA            EDH-DSS-CBC-SHA
+SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA       EDH-DSS-DES-CBC3-SHA
+SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-RSA-DES-CBC-SHA
+SSL_DHE_RSA_WITH_DES_CBC_SHA            EDH-RSA-DES-CBC-SHA
+SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA       EDH-RSA-DES-CBC3-SHA
+
+SSL_DH_anon_EXPORT_WITH_RC4_40_MD5      EXP-ADH-RC4-MD5
+SSL_DH_anon_WITH_RC4_128_MD5            ADH-RC4-MD5
+SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA   EXP-ADH-DES-CBC-SHA
+SSL_DH_anon_WITH_DES_CBC_SHA            ADH-DES-CBC-SHA
+SSL_DH_anon_WITH_3DES_EDE_CBC_SHA       ADH-DES-CBC3-SHA
+
+SSL_FORTEZZA_KEA_WITH_NULL_SHA          Not implemented.
+SSL_FORTEZZA_KEA_WITH_FORTEZZA_CBC_SHA  Not implemented.
+SSL_FORTEZZA_KEA_WITH_RC4_128_SHA       Not implemented.
+.Ed
+.Ss TLS v1.0 cipher suites
+.Bd -unfilled -offset indent
+TLS_RSA_WITH_NULL_MD5                   NULL-MD5
+TLS_RSA_WITH_NULL_SHA                   NULL-SHA
+TLS_RSA_EXPORT_WITH_RC4_40_MD5          EXP-RC4-MD5
+TLS_RSA_WITH_RC4_128_MD5                RC4-MD5
+TLS_RSA_WITH_RC4_128_SHA                RC4-SHA
+TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5      EXP-RC2-CBC-MD5
+TLS_RSA_WITH_IDEA_CBC_SHA               IDEA-CBC-SHA
+TLS_RSA_EXPORT_WITH_DES40_CBC_SHA       EXP-DES-CBC-SHA
+TLS_RSA_WITH_DES_CBC_SHA                DES-CBC-SHA
+TLS_RSA_WITH_3DES_EDE_CBC_SHA           DES-CBC3-SHA
+
+TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA    Not implemented.
+TLS_DH_DSS_WITH_DES_CBC_SHA             Not implemented.
+TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA        Not implemented.
+TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA    Not implemented.
+TLS_DH_RSA_WITH_DES_CBC_SHA             Not implemented.
+TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA        Not implemented.
+TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-DSS-DES-CBC-SHA
+TLS_DHE_DSS_WITH_DES_CBC_SHA            EDH-DSS-CBC-SHA
+TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA       EDH-DSS-DES-CBC3-SHA
+TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-RSA-DES-CBC-SHA
+TLS_DHE_RSA_WITH_DES_CBC_SHA            EDH-RSA-DES-CBC-SHA
+TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA       EDH-RSA-DES-CBC3-SHA
+
+TLS_DH_anon_EXPORT_WITH_RC4_40_MD5      EXP-ADH-RC4-MD5
+TLS_DH_anon_WITH_RC4_128_MD5            ADH-RC4-MD5
+TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA   EXP-ADH-DES-CBC-SHA
+TLS_DH_anon_WITH_DES_CBC_SHA            ADH-DES-CBC-SHA
+TLS_DH_anon_WITH_3DES_EDE_CBC_SHA       ADH-DES-CBC3-SHA
+.Ed
+.Ss AES ciphersuites from RFC 3268, extending TLS v1.0
+.Bd -unfilled -offset indent
+TLS_RSA_WITH_AES_128_CBC_SHA            AES128-SHA
+TLS_RSA_WITH_AES_256_CBC_SHA            AES256-SHA
+
+TLS_DH_DSS_WITH_AES_128_CBC_SHA         Not implemented.
+TLS_DH_DSS_WITH_AES_256_CBC_SHA         Not implemented.
+TLS_DH_RSA_WITH_AES_128_CBC_SHA         Not implemented.
+TLS_DH_RSA_WITH_AES_256_CBC_SHA         Not implemented.
+
+TLS_DHE_DSS_WITH_AES_128_CBC_SHA        DHE-DSS-AES128-SHA
+TLS_DHE_DSS_WITH_AES_256_CBC_SHA        DHE-DSS-AES256-SHA
+TLS_DHE_RSA_WITH_AES_128_CBC_SHA        DHE-RSA-AES128-SHA
+TLS_DHE_RSA_WITH_AES_256_CBC_SHA        DHE-RSA-AES256-SHA
+
+TLS_DH_anon_WITH_AES_128_CBC_SHA        ADH-AES128-SHA
+TLS_DH_anon_WITH_AES_256_CBC_SHA        ADH-AES256-SHA
+.Ed
+.Ss GOST ciphersuites from draft-chudov-cryptopro-cptls, extending TLS v1.0
+.Sy Note :
+These ciphers require an engine which includes GOST cryptographic
+algorithms, such as the
+.Dq ccgost
+engine, included in the OpenSSL distribution.
+.Bd -unfilled -offset indent
+TLS_GOSTR341094_WITH_28147_CNT_IMIT     GOST94-GOST89-GOST89
+TLS_GOSTR341001_WITH_28147_CNT_IMIT     GOST2001-GOST89-GOST89
+TLS_GOSTR341094_WITH_NULL_GOSTR3411     GOST94-NULL-GOST94
+TLS_GOSTR341001_WITH_NULL_GOSTR3411     GOST2001-NULL-GOST94
+.Ed
+.Ss Additional Export 1024 and other cipher suites
+.Sy Note :
+These ciphers can also be used in SSL v3.
+.Bd -unfilled -offset indent
+TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA     EXP1024-DES-CBC-SHA
+TLS_RSA_EXPORT1024_WITH_RC4_56_SHA      EXP1024-RC4-SHA
+TLS_DHE_DSS_EXPORT1024_WITH_DES_CBC_SHA EXP1024-DHE-DSS-DES-CBC-SHA
+TLS_DHE_DSS_EXPORT1024_WITH_RC4_56_SHA  EXP1024-DHE-DSS-RC4-SHA
+TLS_DHE_DSS_WITH_RC4_128_SHA            DHE-DSS-RC4-SHA
+.Ed
+.Sh CIPHERS NOTES
+The non-ephemeral DH modes are currently unimplemented in
+.Nm OpenSSL
+because there is no support for DH certificates.
+.Pp
+Some compiled versions of
+.Nm OpenSSL
+may not include all the ciphers
+listed here because some ciphers were excluded at compile time.
+.Sh CIPHERS EXAMPLES
+Verbose listing of all
+.Nm OpenSSL
+ciphers including NULL ciphers:
+.Pp
+.Dl $ openssl ciphers -v 'ALL:eNULL'
+.Pp
+Include all ciphers except NULL and anonymous DH then sort by
+strength:
+.Pp
+.Dl $ openssl ciphers -v 'ALL:!ADH:@STRENGTH'
+.Pp
+Include only 3DES ciphers and then place RSA ciphers last:
+.Pp
+.Dl $ openssl ciphers -v '3DES:+RSA'
+.Pp
+Include all RC4 ciphers but leave out those without authentication:
+.Pp
+.Dl $ openssl ciphers -v 'RC4:!COMPLEMENTOFDEFAULT'
+.Pp
+Include all ciphers with RSA authentication but leave out ciphers without
+encryption:
+.Pp
+.Dl $ openssl ciphers -v 'RSA:!COMPLEMENTOFALL'
+.Sh CIPHERS HISTORY
+The
+.Ar COMPLEMENTOFALL
+and
+.Ar COMPLEMENTOFDEFAULT
+selection options were added in
+.Nm OpenSSL
+0.9.7.
+.Pp
+The
+.Fl V
+option of the
+.Nm ciphers
+command was added in
+.Nm OpenSSL
+1.0.0.
+.\"
+.\" CRL
+.\"
+.Sh CRL
+.nr nS 1
+.Nm "openssl crl"
+.Bk -words
+.Op Fl CAfile Ar file
+.Op Fl CApath Ar dir
+.Op Fl fingerprint
+.Op Fl hash
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl issuer
+.Op Fl lastupdate
+.Op Fl nextupdate
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm crl
+command processes CRL files in DER or PEM format.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl CAfile Ar file
+Verify the signature on a CRL by looking up the issuing certificate in
+.Ar file .
+.It Fl CApath Ar directory
+Verify the signature on a CRL by looking up the issuing certificate in
+.Ar dir .
+This directory must be a standard certificate directory,
+i.e. a hash of each subject name (using
+.Cm x509 Fl hash )
+should be linked to each certificate.
+.It Fl fingerprint
+Print the CRL fingerprint.
+.It Fl hash
+Output a hash of the issuer name.
+This can be used to look up CRLs in a directory by issuer name.
+.It Fl in Ar file
+This specifies the input file to read from, or standard input if this
+option is not specified.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+.Ar DER
+format is a DER-encoded CRL structure.
+.Ar PEM
+.Pq the default
+is a base64-encoded version of the DER form with header and footer lines.
+.It Fl issuer
+Output the issuer name.
+.It Fl lastupdate
+Output the
+.Ar lastUpdate
+field.
+.It Fl nextupdate
+Output the
+.Ar nextUpdate
+field.
+.It Fl noout
+Don't output the encoded version of the CRL.
+.It Fl out Ar file
+Specifies the output file to write to, or standard output by
+default.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl text
+Print out the CRL in text form.
+.El
+.Sh CRL NOTES
+The PEM CRL format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN X509 CRL-----
+-----END X509 CRL-----
+.Ed
+.Sh CRL EXAMPLES
+Convert a CRL file from PEM to DER:
+.Pp
+.Dl $ openssl crl -in crl.pem -outform DER -out crl.der
+.Pp
+Output the text form of a DER-encoded certificate:
+.Pp
+.Dl $ openssl crl -in crl.der -inform DER -text -noout
+.Sh CRL BUGS
+Ideally, it should be possible to create a CRL using appropriate options
+and files too.
+.\"
+.\" CRL2PKCS7
+.\"
+.Sh CRL2PKCS7
+.nr nS 1
+.Nm "openssl crl2pkcs7"
+.Bk -words
+.Op Fl certfile Ar file
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl nocrl
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm crl2pkcs7
+command takes an optional CRL and one or more
+certificates and converts them into a PKCS#7 degenerate
+.Qq certificates only
+structure.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl certfile Ar file
+Specifies a
+.Ar file
+containing one or more certificates in PEM format.
+All certificates in the file will be added to the PKCS#7 structure.
+This option can be used more than once to read certificates from multiple
+files.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read a CRL from, or standard input if this option is not specified.
+.It Fl inform Ar DER | PEM
+This specifies the CRL input format.
+.Ar DER
+format is a DER-encoded CRL structure.
+.Ar PEM
+.Pq the default
+is a base64-encoded version of the DER form with header and footer lines.
+.It Fl nocrl
+Normally, a CRL is included in the output file.
+With this option, no CRL is
+included in the output file and a CRL is not read from the input file.
+.It Fl out Ar file
+Specifies the output
+.Ar file
+to write the PKCS#7 structure to, or standard output by default.
+.It Fl outform Ar DER | PEM
+This specifies the PKCS#7 structure output format.
+.Ar DER
+format is a DER-encoded PKCS#7 structure.
+.Ar PEM
+.Pq the default
+is a base64-encoded version of the DER form with header and footer lines.
+.El
+.Sh CRL2PKCS7 EXAMPLES
+Create a PKCS#7 structure from a certificate and CRL:
+.Pp
+.Dl $ openssl crl2pkcs7 -in crl.pem -certfile cert.pem -out p7.pem
+.Pp
+Create a PKCS#7 structure in DER format with no CRL from several
+different certificates:
+.Bd -literal -offset indent
+$ openssl crl2pkcs7 -nocrl -certfile newcert.pem \e
+        -certfile demoCA/cacert.pem -outform DER -out p7.der
+.Ed
+.Sh CRL2PKCS7 NOTES
+The output file is a PKCS#7 signed data structure containing no signers and
+just certificates and an optional CRL.
+.Pp
+This utility can be used to send certificates and CAs to Netscape as part of
+the certificate enrollment process.
+This involves sending the DER-encoded output
+as MIME type
+.Em application/x-x509-user-cert .
+.Pp
+The PEM-encoded form with the header and footer lines removed can be used to
+install user certificates and CAs in MSIE using the Xenroll control.
+.\"
+.\" DGST
+.\"
+.Sh DGST
+.nr nS 1
+.Nm "openssl dgst"
+.Bk -words
+.Oo
+.Fl dss1 | md2 | md4 | md5 |
+.Fl ripemd160 | sha | sha1
+.Oc
+.Op Fl binary
+.Op Fl cd
+.Op Fl engine Ar id
+.Op Fl hex
+.Op Fl hmac Ar key
+.Op Fl keyform Ar ENGINE | PEM
+.Op Fl mac Ar algorithm
+.Op Fl macopt Ar nm : Ns Ar v
+.Op Fl out Ar file
+.Op Fl passin Ar arg
+.Op Fl prverify Ar file
+.Op Fl rand Ar
+.Op Fl sign Ar file
+.Op Fl signature Ar file
+.Op Fl sigopt Ar nm : Ns Ar v
+.Op Fl verify Ar file
+.Op Ar
+.Ek
+.nr nS 0
+.Pp
+.Nm openssl
+.Cm md2 | md4 | md5 |
+.Cm ripemd160 | sha | sha1
+.Op Fl c
+.Op Fl d
+.Op Ar
+.Pp
+The digest functions output the message digest of a supplied
+.Ar file
+or
+.Ar files
+in hexadecimal form.
+They can also be used for digital signing and verification.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl binary
+Output the digest or signature in binary form.
+.It Fl c
+Print out the digest in two-digit groups separated by colons; only relevant if
+.Em hex
+format output is used.
+.It Fl d
+Print out BIO debugging information.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm dgst
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+This engine is not used as a source for digest algorithms
+unless it is also specified in the configuration file.
+.It Fl hex
+Digest is to be output as a hex dump.
+This is the default case for a
+.Qq normal
+digest as opposed to a digital signature.
+.It Fl hmac Ar key
+Create a hashed MAC using
+.Ar key .
+.It Fl keyform Ar ENGINE | PEM
+Specifies the key format to sign the digest with.
+.It Fl mac Ar algorithm
+Create a keyed Message Authentication Code (MAC).
+The most popular MAC algorithm is HMAC (hash-based MAC),
+but there are other MAC algorithms which are not based on hash.
+MAC keys and other options should be set via the
+.Fl macopt
+parameter.
+.It Fl macopt Ar nm : Ns Ar v
+Passes options to the MAC algorithm, specified by
+.Fl mac .
+The following options are supported by HMAC:
+.Bl -tag -width Ds
+.It Ar key : Ns Ar string
+Specifies the MAC key as an alphanumeric string
+(use if the key contain printable characters only).
+String length must conform to any restrictions of the MAC algorithm.
+.It Ar hexkey : Ns Ar string
+Specifies the MAC key in hexadecimal form (two hex digits per byte).
+Key length must conform to any restrictions of the MAC algorithm.
+.El
+.It Fl out Ar file
+The file to output to, or standard output by default.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl prverify Ar file
+Verify the signature using the private key in
+.Ar file .
+The output is either
+.Qq Verification OK
+or
+.Qq Verification Failure .
+.It Fl rand Ar
+A file or files containing random data used to seed the random number
+generator, or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.It Fl sign Ar file
+Digitally sign the digest using the private key in
+.Ar file .
+.It Fl signature Ar file
+The actual signature to verify.
+.It Fl sigopt Ar nm : Ns Ar v
+Pass options to the signature algorithm during sign or verify operations.
+The names and values of these options are algorithm-specific.
+.It Fl verify Ar file
+Verify the signature using the public key in
+.Ar file .
+The output is either
+.Qq Verification OK
+or
+.Qq Verification Failure .
+.It Ar
+File or files to digest.
+If no files are specified then standard input is used.
+.El
+.Sh DGST NOTES
+The digest of choice for all new applications is SHA1.
+Other digests are, however, still widely used.
+.Pp
+If you wish to sign or verify data using the DSA algorithm, the dss1
+digest must be used.
+.Pp
+A source of random numbers is required for certain signing algorithms, in
+particular DSA.
+.Pp
+The signing and verify options should only be used if a single file is
+being signed or verified.
+.\"
+.\" DH
+.\"
+.Sh DH
+Diffie-Hellman Parameter Management.
+The
+.Nm dh
+command has been replaced by
+.Nm dhparam .
+See
+.Sx DHPARAM
+below.
+.\"
+.\" DHPARAM
+.\"
+.Sh DHPARAM
+.nr nS 1
+.Nm "openssl dhparam"
+.Bk -words
+.Op Fl 2 | 5
+.Op Fl C
+.Op Fl check
+.Op Fl dsaparam
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl rand Ar
+.Op Fl text
+.Op Ar numbits
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm dhparam
+command is used to manipulate DH parameter files.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl 2 , 5
+The generator to use, either 2 or 5.
+2 is the default.
+If present, the input file is ignored and parameters are generated instead.
+.It Fl C
+This option converts the parameters into C code.
+The parameters can then be loaded by calling the
+.Cm get_dh Ns Ar numbits Ns Li ()
+function.
+.It Fl check
+Check the DH parameters.
+.It Fl dsaparam
+If this option is used, DSA rather than DH parameters are read or created;
+they are converted to DH format.
+Otherwise,
+.Qq strong
+primes
+.Pq such that (p-1)/2 is also prime
+will be used for DH parameter generation.
+.Pp
+DH parameter generation with the
+.Fl dsaparam
+option is much faster,
+and the recommended exponent length is shorter,
+which makes DH key exchange more efficient.
+Beware that with such DSA-style DH parameters,
+a fresh DH key should be created for each use to
+avoid small-subgroup attacks that may be possible otherwise.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm dhparam
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read parameters from, or standard input if this option is not specified.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+The argument
+.Ar DER
+uses an ASN1 DER-encoded form compatible with the PKCS#3 DHparameter
+structure.
+The
+.Ar PEM
+form is the default format:
+it consists of the DER format base64-encoded with
+additional header and footer lines.
+.It Fl noout
+This option inhibits the output of the encoded version of the parameters.
+.It Ar numbits
+This argument specifies that a parameter set should be generated of size
+.Ar numbits .
+It must be the last option.
+If not present, a value of 512 is used.
+If this value is present, the input file is ignored and
+parameters are generated instead.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write parameters to.
+Standard output is used if this option is not present.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl rand Ar
+A file or files containing random data used to seed the random number generator,
+or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified, separated by a
+.Sq \&: .
+.It Fl text
+This option prints out the DH parameters in human readable form.
+.El
+.Sh DHPARAM WARNINGS
+The program
+.Nm dhparam
+combines the functionality of the programs
+.Nm dh
+and
+.Nm gendh
+in previous versions of
+.Nm OpenSSL
+and
+.Nm SSLeay .
+The
+.Nm dh
+and
+.Nm gendh
+programs are retained for now, but may have different purposes in future
+versions of
+.Nm OpenSSL .
+.Sh DHPARAM NOTES
+PEM format DH parameters use the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN DH PARAMETERS-----
+-----END DH PARAMETERS-----
+.Ed
+.Pp
+.Nm OpenSSL
+currently only supports the older PKCS#3 DH,
+not the newer X9.42 DH.
+.Pp
+This program manipulates DH parameters not keys.
+.Sh DHPARAM BUGS
+There should be a way to generate and manipulate DH keys.
+.Sh DHPARAM HISTORY
+The
+.Nm dhparam
+command was added in
+.Nm OpenSSL
+0.9.5.
+The
+.Fl dsaparam
+option was added in
+.Nm OpenSSL
+0.9.6.
+.\"
+.\" DSA
+.\"
+.Sh DSA
+.nr nS 1
+.Nm "openssl dsa"
+.Bk -words
+.Oo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Oc
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl modulus
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl passin Ar arg
+.Op Fl passout Ar arg
+.Op Fl pubin
+.Op Fl pubout
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm dsa
+command processes DSA keys.
+They can be converted between various forms and their components printed out.
+.Pp
+.Sy Note :
+This command uses the traditional
+.Nm SSLeay
+compatible format for private key encryption:
+newer applications should use the more secure PKCS#8 format using the
+.Nm pkcs8
+command.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Xo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Xc
+These options encrypt the private key with the AES, DES, or the triple DES
+ciphers, respectively, before outputting it.
+A pass phrase is prompted for.
+If none of these options is specified, the key is written in plain text.
+This means that using the
+.Nm dsa
+utility to read in an encrypted key with no encryption option can be used to
+remove the pass phrase from a key,
+or by setting the encryption options it can be use to add or change
+the pass phrase.
+These options can only be used with PEM format output files.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm dsa
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read a key from, or standard input if this option is not specified.
+If the key is encrypted, a pass phrase will be prompted for.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+The
+.Ar DER
+argument with a private key uses an ASN1 DER-encoded form of an ASN.1
+SEQUENCE consisting of the values of version
+.Pq currently zero ,
+P, Q, G,
+and the public and private key components, respectively, as ASN.1 INTEGERs.
+When used with a public key it uses a
+.Em SubjectPublicKeyInfo
+structure: it is an error if the key is not DSA.
+.Pp
+The
+.Ar PEM
+form is the default format:
+it consists of the DER format base64-encoded with additional header and footer
+lines.
+In the case of a private key, PKCS#8 format is also accepted.
+.It Fl modulus
+This option prints out the value of the public key component of the key.
+.It Fl noout
+This option prevents output of the encoded version of the key.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write a key to, or standard output if not specified.
+If any encryption options are set then a pass phrase will be
+prompted for.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl pubin
+By default, a private key is read from the input file.
+With this option a public key is read instead.
+.It Fl pubout
+By default, a private key is output.
+With this option a public key will be output instead.
+This option is automatically set if the input is a public key.
+.It Fl text
+Prints out the public/private key components and parameters.
+.El
+.Sh DSA NOTES
+The PEM private key format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN DSA PRIVATE KEY-----
+-----END DSA PRIVATE KEY-----
+.Ed
+.Pp
+The PEM public key format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN PUBLIC KEY-----
+-----END PUBLIC KEY-----
+.Ed
+.Sh DSA EXAMPLES
+To remove the pass phrase on a DSA private key:
+.Pp
+.Dl $ openssl dsa -in key.pem -out keyout.pem
+.Pp
+To encrypt a private key using triple DES:
+.Pp
+.Dl $ openssl dsa -in key.pem -des3 -out keyout.pem
+.Pp
+To convert a private key from PEM to DER format:
+.Pp
+.Dl $ openssl dsa -in key.pem -outform DER -out keyout.der
+.Pp
+To print out the components of a private key to standard output:
+.Pp
+.Dl $ openssl dsa -in key.pem -text -noout
+.Pp
+To just output the public part of a private key:
+.Pp
+.Dl $ openssl dsa -in key.pem -pubout -out pubkey.pem
+.\"
+.\" DSAPARAM
+.\"
+.Sh DSAPARAM
+.nr nS 1
+.Nm "openssl dsaparam"
+.Bk -words
+.Op Fl C
+.Op Fl engine Ar id
+.Op Fl genkey
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl rand Ar
+.Op Fl text
+.Op Ar numbits
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm dsaparam
+command is used to manipulate or generate DSA parameter files.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl C
+This option converts the parameters into C code.
+The parameters can then be loaded by calling the
+.Cm get_dsa Ns Ar XXX Ns Li ()
+function.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm dsaparam
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl genkey
+This option will generate a DSA either using the specified or generated
+parameters.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read parameters from, or standard input if this option is not specified.
+If the
+.Ar numbits
+parameter is included, then this option will be ignored.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+The
+.Ar DER
+argument uses an ASN1 DER-encoded form compatible with RFC 2459
+.Pq PKIX
+DSS-Parms that is a SEQUENCE consisting of p, q and g, respectively.
+The
+.Ar PEM
+form is the default format:
+it consists of the DER format base64-encoded with additional header
+and footer lines.
+.It Fl noout
+This option inhibits the output of the encoded version of the parameters.
+.It Ar numbits
+This option specifies that a parameter set should be generated of size
+.Ar numbits .
+If this option is included, the input file
+.Pq if any
+is ignored.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write parameters to.
+Standard output is used if this option is not present.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl rand Ar
+A file or files containing random data used to seed the random number
+generator, or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified, separated by a
+.Sq \&: .
+.It Fl text
+This option prints out the DSA parameters in human readable form.
+.El
+.Sh DSAPARAM NOTES
+PEM format DSA parameters use the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN DSA PARAMETERS-----
+-----END DSA PARAMETERS-----
+.Ed
+.Pp
+DSA parameter generation is a slow process and as a result the same set of
+DSA parameters is often used to generate several distinct keys.
+.\"
+.\" EC
+.\"
+.Sh EC
+.nr nS 1
+.Nm "openssl ec"
+.Bk -words
+.Op Fl conv_form Ar arg
+.Op Fl des
+.Op Fl des3
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl param_enc Ar arg
+.Op Fl param_out
+.Op Fl passin Ar arg
+.Op Fl passout Ar arg
+.Op Fl pubin
+.Op Fl pubout
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm ec
+command processes EC keys.
+They can be converted between various
+forms and their components printed out.
+Note:
+.Nm OpenSSL
+uses the private key format specified in
+.Dq SEC 1: Elliptic Curve Cryptography
+.Pq Lk http://www.secg.org/ .
+To convert an
+.Nm OpenSSL
+EC private key into the PKCS#8 private key format use the
+.Nm pkcs8
+command.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl conv_form Ar arg
+This specifies how the points on the elliptic curve are converted
+into octet strings.
+Possible values are:
+.Cm compressed
+(the default value),
+.Cm uncompressed ,
+and
+.Cm hybrid .
+For more information regarding
+the point conversion forms please read the X9.62 standard.
+Note:
+Due to patent issues the
+.Cm compressed
+option is disabled by default for binary curves
+and can be enabled by defining the preprocessor macro
+.Ar OPENSSL_EC_BIN_PT_COMP
+at compile time.
+.It Fl des | des3
+These options encrypt the private key with the DES, triple DES, or
+any other cipher supported by
+.Nm OpenSSL
+before outputting it.
+A pass phrase is prompted for.
+If none of these options is specified the key is written in plain text.
+This means that using the
+.Nm ec
+utility to read in an encrypted key with no
+encryption option can be used to remove the pass phrase from a key,
+or by setting the encryption options
+it can be use to add or change the pass phrase.
+These options can only be used with PEM format output files.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm ec
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input filename to read a key from,
+or standard input if this option is not specified.
+If the key is encrypted a pass phrase will be prompted for.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+DER with a private key uses
+an ASN.1 DER-encoded SEC1 private key.
+When used with a public key it
+uses the SubjectPublicKeyInfo structure as specified in RFC 3280.
+PEM is the default format:
+it consists of the DER format base64
+encoded with additional header and footer lines.
+In the case of a private key
+PKCS#8 format is also accepted.
+.It Fl noout
+Prevents output of the encoded version of the key.
+.It Fl out Ar file
+Specifies the output filename to write a key to,
+or standard output if none is specified.
+If any encryption options are set then a pass phrase will be prompted for.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | PEM
+This specifies the output format.
+The options have the same meaning as the
+.Fl inform
+option.
+.It Fl param_enc Ar arg
+This specifies how the elliptic curve parameters are encoded.
+Possible value are:
+.Cm named_curve ,
+i.e. the EC parameters are specified by an OID; or
+.Cm explicit ,
+where the EC parameters are explicitly given
+(see RFC 3279 for the definition of the EC parameter structures).
+The default value is
+.Cm named_curve .
+Note: the
+.Cm implicitlyCA
+alternative,
+as specified in RFC 3279,
+is currently not implemented in
+.Nm OpenSSL .
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl pubin
+By default a private key is read from the input file;
+with this option a public key is read instead.
+.It Fl pubout
+By default a private key is output;
+with this option a public key is output instead.
+This option is automatically set if the input is a public key.
+.It Fl text
+Prints out the public/private key components and parameters.
+.El
+.Sh EC NOTES
+The PEM private key format uses the header and footer lines:
+.Bd -literal -offset indent
+-----BEGIN EC PRIVATE KEY-----
+-----END EC PRIVATE KEY-----
+.Ed
+.Pp
+The PEM public key format uses the header and footer lines:
+.Bd -literal -offset indent
+-----BEGIN PUBLIC KEY-----
+-----END PUBLIC KEY-----
+.Ed
+.Sh EC EXAMPLES
+To encrypt a private key using triple DES:
+.Bd -literal -offset indent
+$ openssl ec -in key.pem -des3 -out keyout.pem
+.Ed
+.Pp
+To convert a private key from PEM to DER format:
+.Bd -literal -offset indent
+$ openssl ec -in key.pem -outform DER -out keyout.der
+.Ed
+.Pp
+To print out the components of a private key to standard output:
+.Bd -literal -offset indent
+$ openssl ec -in key.pem -text -noout
+.Ed
+.Pp
+To just output the public part of a private key:
+.Bd -literal -offset indent
+$ openssl ec -in key.pem -pubout -out pubkey.pem
+.Ed
+.Pp
+To change the parameter encoding to
+.Cm explicit :
+.Bd -literal -offset indent
+$ openssl ec -in key.pem -param_enc explicit -out keyout.pem
+.Ed
+.Pp
+To change the point conversion form to
+.Cm compressed :
+.Bd -literal -offset indent
+$ openssl ec -in key.pem -conv_form compressed -out keyout.pem
+.Ed
+.Sh EC HISTORY
+The
+.Nm ec
+command was first introduced in
+.Nm OpenSSL
+0.9.8.
+.Sh EC AUTHORS
+.An Nils Larsch .
+.\"
+.\" ECPARAM
+.\"
+.Sh ECPARAM
+.nr nS 1
+.Nm "openssl ecparam"
+.Bk -words
+.Op Fl C
+.Op Fl check
+.Op Fl conv_form Ar arg
+.Op Fl engine Ar id
+.Op Fl genkey
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl list_curves
+.Op Fl name Ar arg
+.Op Fl no_seed
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl param_enc Ar arg
+.Op Fl rand Ar file ...
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+This command is used to manipulate or generate EC parameter files.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl C
+Convert the EC parameters into C code.
+The parameters can then be loaded by calling the
+.Fn get_ec_group_XXX
+function.
+.It Fl check
+Validate the elliptic curve parameters.
+.It Fl conv_form Ar arg
+Specify how the points on the elliptic curve are converted
+into octet strings.
+Possible values are:
+.Cm compressed
+(the default value),
+.Cm uncompressed ,
+and
+.Cm hybrid .
+For more information regarding
+the point conversion forms please read the X9.62 standard.
+Note:
+Due to patent issues the
+.Cm compressed
+option is disabled by default for binary curves
+and can be enabled by defining the preprocessor macro
+.Ar OPENSSL_EC_BIN_PT_COMP
+at compile time.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm ecparam
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl genkey
+Generate an EC private key using the specified parameters.
+.It Fl in Ar file
+Specify the input filename to read parameters from or standard input if
+this option is not specified.
+.It Fl inform Ar DER | PEM
+Specify the input format.
+DER uses an ASN.1 DER-encoded
+form compatible with RFC 3279 EcpkParameters.
+PEM is the default format:
+it consists of the DER format base64 encoded with additional
+header and footer lines.
+.It Fl list_curves
+Print out a list of all
+currently implemented EC parameter names and exit.
+.It Fl name Ar arg
+Use the EC parameters with the specified 'short' name.
+Use
+.Fl list_curves
+to get a list of all currently implemented EC parameters.
+.It Fl no_seed
+Inhibit that the 'seed' for the parameter generation
+is included in the ECParameters structure (see RFC 3279).
+.It Fl noout
+Inhibit the output of the encoded version of the parameters.
+.It Fl out Ar file
+Specify the output filename parameters are written to.
+Standard output is used if this option is not present.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | PEM
+Specify the output format;
+the parameters have the same meaning as the
+.Fl inform
+option.
+.It Fl param_enc Ar arg
+This specifies how the elliptic curve parameters are encoded.
+Possible value are:
+.Cm named_curve ,
+i.e. the EC parameters are specified by an OID, or
+.Cm explicit ,
+where the EC parameters are explicitly given
+(see RFC 3279 for the definition of the EC parameter structures).
+The default value is
+.Cm named_curve .
+Note: the
+.Cm implicitlyCA
+alternative, as specified in RFC 3279,
+is currently not implemented in
+.Nm OpenSSL .
+.It Fl rand Ar file ...
+A file or files containing random data used to seed the random number
+generator, or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by an OS-dependent character.
+The separator is
+.Sq \&;
+for MS-Windows,
+.Sq \&,
+for OpenVMS, and
+.Sq \&:
+for all others.
+.It Fl text
+Print out the EC parameters in human readable form.
+.El
+.Sh ECPARAM NOTES
+PEM format EC parameters use the header and footer lines:
+.Bd -literal -offset indent
+-----BEGIN EC PARAMETERS-----
+-----END EC PARAMETERS-----
+.Ed
+.Pp
+.Nm OpenSSL
+is currently not able to generate new groups and therefore
+.Nm ecparam
+can only create EC parameters from known (named) curves.
+.Sh ECPARAM EXAMPLES
+To create EC parameters with the group 'prime192v1':
+.Bd -literal -offset indent
+$ openssl ecparam -out ec_param.pem -name prime192v1
+.Ed
+.Pp
+To create EC parameters with explicit parameters:
+.Bd -literal -offset indent
+$ openssl ecparam -out ec_param.pem -name prime192v1 \e
+        -param_enc explicit
+.Ed
+.Pp
+To validate given EC parameters:
+.Bd -literal -offset indent
+$ openssl ecparam -in ec_param.pem -check
+.Ed
+.Pp
+To create EC parameters and a private key:
+.Bd -literal -offset indent
+$ openssl ecparam -out ec_key.pem -name prime192v1 -genkey
+.Ed
+.Pp
+To change the point encoding to 'compressed':
+.Bd -literal -offset indent
+$ openssl ecparam -in ec_in.pem -out ec_out.pem \e
+        -conv_form compressed
+.Ed
+.Pp
+To print out the EC parameters to standard output:
+.Bd -literal -offset indent
+$ openssl ecparam -in ec_param.pem -noout -text
+.Ed
+.Sh ECPARAM HISTORY
+The
+.Nm ecparam
+command was first introduced in
+.Nm OpenSSL
+0.9.8.
+.Sh ECPARAM AUTHORS
+.An Nils Larsch .
+.\"
+.\" ENC
+.\"
+.Sh ENC
+.nr nS 1
+.Nm "openssl enc"
+.Bk -words
+.Fl ciphername
+.Op Fl AadePp
+.Op Fl base64
+.Op Fl bufsize Ar number
+.Op Fl debug
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl iv Ar IV
+.Op Fl K Ar key
+.Op Fl k Ar password
+.Op Fl kfile Ar file
+.Op Fl md Ar digest
+.Op Fl none
+.Op Fl nopad
+.Op Fl nosalt
+.Op Fl out Ar file
+.Op Fl pass Ar arg
+.Op Fl S Ar salt
+.Op Fl salt
+.Ek
+.nr nS 0
+.Pp
+The symmetric cipher commands allow data to be encrypted or decrypted
+using various block and stream ciphers using keys based on passwords
+or explicitly provided.
+Base64 encoding or decoding can also be performed either by itself
+or in addition to the encryption or decryption.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl A
+If the
+.Fl a
+option is set, then base64 process the data on one line.
+.It Fl a , base64
+Base64 process the data.
+This means that if encryption is taking place, the data is base64-encoded
+after encryption.
+If decryption is set, the input data is base64 decoded before
+being decrypted.
+.It Fl bufsize Ar number
+Set the buffer size for I/O.
+.It Fl d
+Decrypt the input data.
+.It Fl debug
+Debug the BIOs used for I/O.
+.It Fl e
+Encrypt the input data: this is the default.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm enc
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+The input
+.Ar file ;
+standard input by default.
+.It Fl iv Ar IV
+The actual
+.Ar IV
+.Pq initialisation vector
+to use:
+this must be represented as a string comprised only of hex digits.
+When only the
+.Ar key
+is specified using the
+.Fl K
+option, the
+.Ar IV
+must explicitly be defined.
+When a password is being specified using one of the other options,
+the
+.Ar IV
+is generated from this password.
+.It Fl K Ar key
+The actual
+.Ar key
+to use:
+this must be represented as a string comprised only of hex digits.
+If only the key is specified, the
+.Ar IV
+must be additionally specified using the
+.Fl iv
+option.
+When both a
+.Ar key
+and a
+.Ar password
+are specified, the
+.Ar key
+given with the
+.Fl K
+option will be used and the
+.Ar IV
+generated from the password will be taken.
+It probably does not make much sense to specify both
+.Ar key
+and
+.Ar password .
+.It Fl k Ar password
+The
+.Ar password
+to derive the key from.
+This is for compatibility with previous versions of
+.Nm OpenSSL .
+Superseded by the
+.Fl pass
+option.
+.It Fl kfile Ar file
+Read the password to derive the key from the first line of
+.Ar file .
+This is for compatibility with previous versions of
+.Nm OpenSSL .
+Superseded by the
+.Fl pass
+option.
+.It Fl md Ar digest
+Use
+.Ar digest
+to create a key from a pass phrase.
+.Ar digest
+may be one of
+.Dq md2 ,
+.Dq md5 ,
+.Dq sha ,
+or
+.Dq sha1 .
+.It Fl none
+Use NULL cipher (no encryption or decryption of input).
+.It Fl nopad
+Disable standard block padding.
+.It Fl nosalt
+Don't use a
+.Ar salt
+in the key derivation routines.
+This option should
+.Em NEVER
+be used unless compatibility with previous versions of
+.Nm OpenSSL
+or
+.Nm SSLeay
+is required.
+.It Fl out Ar file
+The output
+.Ar file ,
+standard output by default.
+.It Fl P
+Print out the
+.Ar salt ,
+.Ar key ,
+and
+.Ar IV
+used, then immediately exit;
+don't do any encryption or decryption.
+.It Fl p
+Print out the
+.Ar salt ,
+.Ar key ,
+and
+.Ar IV
+used.
+.It Fl pass Ar arg
+The password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl S Ar salt
+The actual
+.Ar salt
+to use:
+this must be represented as a string comprised only of hex digits.
+.It Fl salt
+Use a
+.Ar salt
+in the key derivation routines.
+This is the default.
+.El
+.Sh ENC NOTES
+The program can be called either as
+.Nm openssl ciphername
+or
+.Nm openssl enc -ciphername .
+But the first form doesn't work with engine-provided ciphers,
+because this form is processed before the
+configuration file is read and any engines loaded.
+.Pp
+Engines which provide entirely new encryption algorithms
+should be configured in the configuration file.
+Engines, specified on the command line using the
+.Fl engine
+option,
+can only be used for hardware-assisted implementations of ciphers,
+supported by
+.Nm OpenSSL
+core, or by other engines specified in the configuration file.
+.Pp
+When
+.Nm enc
+lists supported ciphers,
+ciphers provided by engines specified in the configuration files
+are listed too.
+.Pp
+A password will be prompted for to derive the
+.Ar key
+and
+.Ar IV
+if necessary.
+.Pp
+The
+.Fl nosalt
+option should
+.Em NEVER
+be used unless compatibility with previous versions of
+.Nm OpenSSL
+or
+.Nm SSLeay
+is required.
+.Pp
+With the
+.Fl nosalt
+option it is possible to perform efficient dictionary
+attacks on the password and to attack stream cipher encrypted data.
+The reason for this is that without the salt
+the same password always generates the same encryption key.
+When the salt
+is being used the first eight bytes of the encrypted data are reserved
+for the salt:
+it is generated at random when encrypting a file and read from the
+encrypted file when it is decrypted.
+.Pp
+Some of the ciphers do not have large keys and others have security
+implications if not used correctly.
+A beginner is advised to just use a strong block cipher in CBC mode
+such as bf or des3.
+.Pp
+All the block ciphers normally use PKCS#5 padding also known as standard block
+padding:
+this allows a rudimentary integrity or password check to be performed.
+However, since the chance of random data passing the test is
+better than 1 in 256, it isn't a very good test.
+.Pp
+If padding is disabled, the input data must be a multiple of the cipher
+block length.
+.Pp
+All RC2 ciphers have the same key and effective key length.
+.Pp
+Blowfish and RC5 algorithms use a 128-bit key.
+.Sh ENC SUPPORTED CIPHERS
+.Bd -unfilled -offset indent
+aes-[128|192|256]-cbc   128/192/256 bit AES in CBC mode
+aes-[128|192|256]       Alias for aes-[128|192|256]-cbc
+aes-[128|192|256]-cfb   128/192/256 bit AES in 128 bit CFB mode
+aes-[128|192|256]-cfb1  128/192/256 bit AES in 1 bit CFB mode
+aes-[128|192|256]-cfb8  128/192/256 bit AES in 8 bit CFB mode
+aes-[128|192|256]-ecb   128/192/256 bit AES in ECB mode
+aes-[128|192|256]-ofb   128/192/256 bit AES in OFB mode
+
+base64                  Base 64
+
+bf                      Alias for bf-cbc
+bf-cbc                  Blowfish in CBC mode
+bf-cfb                  Blowfish in CFB mode
+bf-ecb                  Blowfish in ECB mode
+bf-ofb                  Blowfish in OFB mode
+
+cast                    Alias for cast-cbc
+cast-cbc                CAST in CBC mode
+cast5-cbc               CAST5 in CBC mode
+cast5-cfb               CAST5 in CFB mode
+cast5-ecb               CAST5 in ECB mode
+cast5-ofb               CAST5 in OFB mode
+
+des                     Alias for des-cbc
+des-cbc                 DES in CBC mode
+des-cfb                 DES in CBC mode
+des-ecb                 DES in ECB mode
+des-ofb                 DES in OFB mode
+
+des-ede                 Two key triple DES EDE in ECB mode
+des-ede-cbc             Two key triple DES EDE in CBC mode
+des-ede-cfb             Two key triple DES EDE in CFB mode
+des-ede-ofb             Two key triple DES EDE in OFB mode
+
+des3                    Alias for des-ede3-cbc
+des-ede3                Three key triple DES EDE in ECB mode
+des-ede3-cbc            Three key triple DES EDE in CBC mode
+des-ede3-cfb            Three key triple DES EDE CFB mode
+des-ede3-ofb            Three key triple DES EDE in OFB mode
+
+desx                    DESX algorithm
+
+rc2                     Alias for rc2-cbc
+rc2-cbc                 128-bit RC2 in CBC mode
+rc2-cfb                 128-bit RC2 in CFB mode
+rc2-ecb                 128-bit RC2 in ECB mode
+rc2-ofb                 128-bit RC2 in OFB mode
+rc2-64-cbc              64-bit RC2 in CBC mode
+rc2-40-cbc              40-bit RC2 in CBC mode
+
+rc4                     128-bit RC4
+rc4-40                  40-bit RC4
+.Ed
+.Sh ENC EXAMPLES
+Just base64 encode a binary file:
+.Pp
+.Dl $ openssl base64 -in file.bin -out file.b64
+.Pp
+Decode the same file:
+.Pp
+.Dl $ openssl base64 -d -in file.b64 -out file.bin
+.Pp
+Encrypt a file using triple DES in CBC mode using a prompted password:
+.Pp
+.Dl $ openssl des3 -salt -in file.txt -out file.des3
+.Pp
+Decrypt a file using a supplied password:
+.Pp
+.Dl "$ openssl des3 -d -in file.des3 -out file.txt -k mypassword"
+.Pp
+Encrypt a file then base64 encode it
+(so it can be sent via mail for example)
+using Blowfish in CBC mode:
+.Pp
+.Dl $ openssl bf -a -salt -in file.txt -out file.bf
+.Pp
+Base64 decode a file then decrypt it:
+.Pp
+.Dl "$ openssl bf -d -a -in file.bf -out file.txt"
+.Sh ENC BUGS
+The
+.Fl A
+option when used with large files doesn't work properly.
+.Pp
+There should be an option to allow an iteration count to be included.
+.Pp
+The
+.Nm enc
+program only supports a fixed number of algorithms with certain parameters.
+Therefore it is not possible to use RC2 with a 76-bit key
+or RC4 with an 84-bit key with this program.
+.\"
+.\" ENGINE
+.\"
+.Sh ENGINE
+.Nm openssl engine
+.Op Fl ctv
+.Op Fl post Ar cmd
+.Op Fl pre Ar cmd
+.Op Ar engine ...
+.Pp
+The
+.Nm engine
+command provides loadable module information and manipulation
+of various engines.
+Any options are applied to all engines supplied on the command line,
+or all supported engines if none are specified.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl c
+For each engine, also list the capabilities.
+.It Fl post Ar cmd
+Run command
+.Ar cmd
+against the engine after loading it
+(only used if
+.Fl t
+is also provided).
+.It Fl pre Ar cmd
+Run command
+.Ar cmd
+against the engine before any attempts
+to load it
+(only used if
+.Fl t
+is also provided).
+.It Fl t
+For each engine, check that they are really available.
+.Fl tt
+will display an error trace for unavailable engines.
+.It Fl v
+Verbose mode.
+For each engine, list its 'control commands'.
+.Fl vv
+will additionally display each command's description.
+.Fl vvv
+will also add the input flags for each command.
+.Fl vvvv
+will also show internal input flags.
+.El
+.\"
+.\" ERRSTR
+.\"
+.Sh ERRSTR
+.Nm openssl errstr
+.Op Fl stats
+.Ar errno ...
+.Pp
+The
+.Nm errstr
+command performs error number to error string conversion,
+generating a human-readable string representing the error code
+.Ar errno .
+The string is obtained through the
+.Xr ERR_error_string_n 3
+function and has the following format:
+.Pp
+.Dl error:[error code]:[library name]:[function name]:[reason string]
+.Pp
+.Bq error code
+is an 8-digit hexadecimal number.
+The remaining fields
+.Bq library name ,
+.Bq function name ,
+and
+.Bq reason string
+are all ASCII text.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl stats
+Print debugging statistics about various aspects of the hash table.
+.El
+.Sh ERRSTR EXAMPLES
+The following error code:
+.Pp
+.Dl 27594:error:2006D080:lib(32):func(109):reason(128):bss_file.c:107:
+.Pp
+\&...can be displayed with:
+.Pp
+.Dl $ openssl errstr 2006D080
+.Pp
+\&...to produce the error message:
+.Pp
+.Dl error:2006D080:BIO routines:BIO_new_file:no such file
+.\"
+.\" GENDH
+.\"
+.Sh GENDH
+Generation of Diffie-Hellman Parameters.
+Replaced by
+.Nm dhparam .
+See
+.Sx DHPARAM
+above.
+.\"
+.\" GENDSA
+.\"
+.Sh GENDSA
+.nr nS 1
+.Nm "openssl gendsa"
+.Bk -words
+.Oo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Oc
+.Op Fl engine Ar id
+.Op Fl out Ar file
+.Op Fl rand Ar
+.Op Ar paramfile
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm gendsa
+command generates a DSA private key from a DSA parameter file
+(which will typically be generated by the
+.Nm openssl dsaparam
+command).
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Xo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Xc
+These options encrypt the private key with the AES, DES,
+or the triple DES ciphers, respectively, before outputting it.
+A pass phrase is prompted for.
+If none of these options are specified, no encryption is used.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm gendsa
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl out Ar file
+The output
+.Ar file .
+If this argument is not specified, standard output is used.
+.It Fl rand Ar
+A file or files containing random data used to seed the random number
+generator, or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.It Ar paramfile
+This option specifies the DSA parameter file to use.
+The parameters in this file determine the size of the private key.
+DSA parameters can be generated and examined using the
+.Nm openssl dsaparam
+command.
+.El
+.Sh GENDSA NOTES
+DSA key generation is little more than random number generation so it is
+much quicker than RSA key generation, for example.
+.\"
+.\" GENPKEY
+.\"
+.Sh GENPKEY
+.nr nS 1
+.Nm "openssl genpkey"
+.Bk -words
+.Op Fl algorithm Ar alg
+.Op Ar cipher
+.Op Fl engine Ar id
+.Op Fl genparam
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl paramfile Ar file
+.Op Fl pass Ar arg
+.Op Fl pkeyopt Ar opt : Ns Ar value
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm genpkey
+command generates private keys.
+The use of this
+program is encouraged over the algorithm specific utilities
+because additional algorithm options
+and engine-provided algorithms can be used.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl algorithm Ar alg
+The public key algorithm to use,
+such as RSA, DSA, or DH.
+If used this option must precede any
+.Fl pkeyopt
+options.
+The options
+.Fl paramfile
+and
+.Fl algorithm
+are mutually exclusive.
+.It Ar cipher
+Encrypt the private key with the supplied cipher.
+Any algorithm name accepted by
+.Fn EVP_get_cipherbyname
+is acceptable, such as
+.Cm des3 .
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm genpkey
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl genparam
+Generate a set of parameters instead of a private key.
+If used this option must precede any
+.Fl algorithm ,
+.Fl paramfile ,
+or
+.Fl pkeyopt
+options.
+.It Fl out Ar file
+The output filename.
+If this argument is not specified then standard output is used.
+.It Fl outform Ar DER | PEM
+This specifies the output format, DER or PEM.
+.It Fl paramfile Ar file
+Some public key algorithms generate a private key based on a set of parameters.
+They can be supplied using this option.
+If this option is used the public key
+algorithm used is determined by the parameters.
+If used this option must precede any
+.Fl pkeyopt
+options.
+The options
+.Fl paramfile
+and
+.Fl algorithm
+are mutually exclusive.
+.It Fl pass Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl pkeyopt Ar opt : Ns Ar value
+Set the public key algorithm option
+.Ar opt
+to
+.Ar value .
+The precise set of options supported
+depends on the public key algorithm used and its implementation.
+See
+.Sx GENPKEY KEY GENERATION OPTIONS
+below for more details.
+.It Fl text
+Print an (unencrypted) text representation of private and public keys and
+parameters along with the DER or PEM structure.
+.El
+.Sh GENPKEY KEY GENERATION OPTIONS
+The options supported by each algorithm
+and indeed each implementation of an algorithm can vary.
+The options for the
+.Nm OpenSSL
+implementations are detailed below.
+.Bl -tag -width Ds -offset indent
+.It rsa_keygen_bits : Ns Ar numbits
+(RSA)
+The number of bits in the generated key.
+If not specified 1024 is used.
+.It rsa_keygen_pubexp : Ns Ar value
+(RSA)
+The RSA public exponent value.
+This can be a large decimal or hexadecimal value if preceded by 0x.
+The default value is 65537.
+.It dsa_paramgen_bits : Ns Ar numbits
+(DSA)
+The number of bits in the generated parameters.
+If not specified 1024 is used.
+.It dh_paramgen_prime_len : Ns Ar numbits
+(DH)
+The number of bits in the prime parameter
+.Ar p .
+.It dh_paramgen_generator : Ns Ar value
+(DH)
+The value to use for the generator
+.Ar g .
+.It ec_paramgen_curve : Ns Ar curve
+(EC)
+The EC curve to use.
+.El
+.Sh GENPKEY EXAMPLES
+Generate an RSA private key using default parameters:
+.Bd -literal -offset indent
+$ openssl genpkey -algorithm RSA -out key.pem
+.Ed
+.Pp
+Encrypt and output a private key using 128-bit AES and the passphrase "hello":
+.Bd -literal -offset indent
+$ openssl genpkey -algorithm RSA -out key.pem \e
+        -aes-128-cbc -pass pass:hello
+.Ed
+.Pp
+Generate a 2048-bit RSA key using 3 as the public exponent:
+.Bd -literal -offset indent
+$ openssl genpkey -algorithm RSA -out key.pem \e
+        -pkeyopt rsa_keygen_bits:2048 -pkeyopt rsa_keygen_pubexp:3
+.Ed
+.Pp
+Generate 1024-bit DSA parameters:
+.Bd -literal -offset indent
+$ openssl genpkey -genparam -algorithm DSA \e
+        -out dsap.pem -pkeyopt dsa_paramgen_bits:1024
+.Ed
+.Pp
+Generate a DSA key from parameters:
+.Bd -literal -offset indent
+$ openssl genpkey -paramfile dsap.pem -out dsakey.pem
+.Ed
+.Pp
+Generate 1024-bit DH parameters:
+.Bd -literal -offset indent
+$ openssl genpkey -genparam -algorithm DH \e
+        -out dhp.pem -pkeyopt dh_paramgen_prime_len:1024
+.Ed
+.Pp
+Generate a DH key from parameters:
+.Bd -literal -offset indent
+$ openssl genpkey -paramfile dhp.pem -out dhkey.pem
+.Ed
+.\"
+.\" GENRSA
+.\"
+.Sh GENRSA
+.nr nS 1
+.Nm "openssl genrsa"
+.Bk -words
+.Op Fl 3 | f4
+.Oo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Oc
+.Op Fl engine Ar id
+.Op Fl out Ar file
+.Op Fl passout Ar arg
+.Op Fl rand Ar
+.Op Ar numbits
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm genrsa
+command generates an RSA private key.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl 3 | f4
+The public exponent to use, either 3 or 65537.
+The default is 65537.
+.It Xo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Xc
+These options encrypt the private key with the AES, DES,
+or the triple DES ciphers, respectively, before outputting it.
+If none of these options are specified, no encryption is used.
+If encryption is used, a pass phrase is prompted for,
+if it is not supplied via the
+.Fl passout
+option.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm genrsa
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl out Ar file
+The output
+.Ar file .
+If this argument is not specified, standard output is used.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl rand Ar
+A file or files
+containing random data used to seed the random number
+generator, or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.It Ar numbits
+The size of the private key to generate in bits.
+This must be the last option specified.
+The default is 512.
+.El
+.Sh GENRSA NOTES
+RSA private key generation essentially involves the generation of two prime
+numbers.
+When generating a private key, various symbols will be output to
+indicate the progress of the generation.
+A
+.Sq \&.
+represents each number which has passed an initial sieve test;
+.Sq +
+means a number has passed a single round of the Miller-Rabin primality test.
+A newline means that the number has passed all the prime tests
+.Pq the actual number depends on the key size .
+.Pp
+Because key generation is a random process,
+the time taken to generate a key may vary somewhat.
+.Sh GENRSA BUGS
+A quirk of the prime generation algorithm is that it cannot generate small
+primes.
+Therefore the number of bits should not be less that 64.
+For typical private keys this will not matter because for security reasons
+they will be much larger
+.Pq typically 1024 bits .
+.\"
+.\" NSEQ
+.\"
+.Sh NSEQ
+.Nm openssl nseq
+.Op Fl in Ar file
+.Op Fl out Ar file
+.Op Fl toseq
+.Pp
+The
+.Nm nseq
+command takes a file containing a Netscape certificate
+sequence and prints out the certificates contained in it or takes a
+file of certificates and converts it into a Netscape certificate
+sequence.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read, or standard input if this option is not specified.
+.It Fl out Ar file
+Specifies the output
+.Ar file ,
+or standard output by default.
+.It Fl toseq
+Normally, a Netscape certificate sequence will be input and the output
+is the certificates contained in it.
+With the
+.Fl toseq
+option the situation is reversed:
+a Netscape certificate sequence is created from a file of certificates.
+.El
+.Sh NSEQ EXAMPLES
+Output the certificates in a Netscape certificate sequence:
+.Bd -literal -offset indent
+$ openssl nseq -in nseq.pem -out certs.pem
+.Ed
+.Pp
+Create a Netscape certificate sequence:
+.Bd -literal -offset indent
+$ openssl nseq -in certs.pem -toseq -out nseq.pem
+.Ed
+.Sh NSEQ NOTES
+The PEM-encoded form uses the same headers and footers as a certificate:
+.Bd -unfilled -offset indent
+-----BEGIN CERTIFICATE-----
+-----END CERTIFICATE-----
+.Ed
+.Pp
+A Netscape certificate sequence is a Netscape specific form that can be sent
+to browsers as an alternative to the standard PKCS#7 format when several
+certificates are sent to the browser:
+for example during certificate enrollment.
+It is used by the Netscape certificate server, for example.
+.Sh NSEQ BUGS
+This program needs a few more options,
+like allowing DER or PEM input and output files
+and allowing multiple certificate files to be used.
+.\"
+.\" OCSP
+.\"
+.Sh OCSP
+.nr nS 1
+.Nm "openssl ocsp"
+.Bk -words
+.Op Fl CA Ar file
+.Op Fl CAfile Ar file
+.Op Fl CApath Ar directory
+.Op Fl cert Ar file
+.Op Fl dgst Ar alg
+.Oo
+.Fl host
+.Ar hostname : Ns Ar port
+.Oc
+.Op Fl index Ar indexfile
+.Op Fl issuer Ar file
+.Op Fl ndays Ar days
+.Op Fl nmin Ar minutes
+.Op Fl no_cert_checks
+.Op Fl no_cert_verify
+.Op Fl no_certs
+.Op Fl no_chain
+.Op Fl no_intern
+.Op Fl no_nonce
+.Op Fl no_signature_verify
+.Op Fl nonce
+.Op Fl noverify
+.Op Fl nrequest Ar number
+.Op Fl out Ar file
+.Op Fl path Ar path
+.Op Fl port Ar portnum
+.Op Fl req_text
+.Op Fl reqin Ar file
+.Op Fl reqout Ar file
+.Op Fl resp_key_id
+.Op Fl resp_no_certs
+.Op Fl resp_text
+.Op Fl respin Ar file
+.Op Fl respout Ar file
+.Op Fl rkey Ar file
+.Op Fl rother Ar file
+.Op Fl rsigner Ar file
+.Op Fl serial Ar number
+.Op Fl sign_other Ar file
+.Op Fl signer Ar file
+.Op Fl signkey Ar file
+.Op Fl status_age Ar age
+.Op Fl text
+.Op Fl trust_other
+.Op Fl url Ar responder_url
+.Op Fl VAfile Ar file
+.Op Fl validity_period Ar nsec
+.Op Fl verify_other Ar file
+.Ek
+.nr nS 0
+.Pp
+The Online Certificate Status Protocol
+.Pq OCSP
+enables applications to determine the
+.Pq revocation
+state of an identified certificate
+.Pq RFC 2560 .
+.Pp
+The
+.Nm ocsp
+command performs many common OCSP tasks.
+It can be used to print out requests and responses,
+create requests and send queries to an OCSP responder,
+and behave like a mini OCSP server itself.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl CAfile Ar file , Fl CApath Ar directory
+.Ar file
+or
+.Ar path
+containing trusted CA certificates.
+These are used to verify the signature on the OCSP response.
+.It Fl cert Ar file
+Add the certificate
+.Ar file
+to the request.
+The issuer certificate is taken from the previous
+.Fl issuer
+option, or an error occurs if no issuer certificate is specified.
+.It Fl dgst Ar alg
+Sets the digest algorithm to use for certificate identification
+in the OCSP request.
+By default SHA-1 is used.
+.It Xo
+.Fl host Ar hostname : Ns Ar port ,
+.Fl path Ar path
+.Xc
+If the
+.Fl host
+option is present, then the OCSP request is sent to the host
+.Ar hostname
+on port
+.Ar port .
+.Fl path
+specifies the HTTP path name to use, or
+.Sq /
+by default.
+.It Fl issuer Ar file
+This specifies the current issuer certificate.
+This option can be used multiple times.
+The certificate specified in
+.Ar file
+must be in PEM format.
+This option
+.Em must
+come before any
+.Fl cert
+options.
+.It Fl no_cert_checks
+Don't perform any additional checks on the OCSP response signer's certificate.
+That is, do not make any checks to see if the signer's certificate is
+authorised to provide the necessary status information:
+as a result this option should only be used for testing purposes.
+.It Fl no_cert_verify
+Don't verify the OCSP response signer's certificate at all.
+Since this option allows the OCSP response to be signed by any certificate,
+it should only be used for testing purposes.
+.It Fl no_certs
+Don't include any certificates in signed request.
+.It Fl no_chain
+Do not use certificates in the response as additional untrusted CA
+certificates.
+.It Fl no_intern
+Ignore certificates contained in the OCSP response
+when searching for the signer's certificate.
+With this option, the signer's certificate must be specified with either the
+.Fl verify_other
+or
+.Fl VAfile
+options.
+.It Fl no_signature_verify
+Don't check the signature on the OCSP response.
+Since this option tolerates invalid signatures on OCSP responses,
+it will normally only be used for testing purposes.
+.It Fl nonce , no_nonce
+Add an OCSP
+.Em nonce
+extension to a request or disable an OCSP
+.Em nonce
+addition.
+Normally, if an OCSP request is input using the
+.Fl respin
+option no
+.Em nonce
+is added:
+using the
+.Fl nonce
+option will force addition of a
+.Em nonce .
+If an OCSP request is being created (using the
+.Fl cert
+and
+.Fl serial
+options)
+a
+.Em nonce
+is automatically added; specifying
+.Fl no_nonce
+overrides this.
+.It Fl noverify
+Don't attempt to verify the OCSP response signature or the
+.Em nonce
+values.
+This option will normally only be used for debugging
+since it disables all verification of the responder's certificate.
+.It Fl out Ar file
+Specify output
+.Ar file ;
+default is standard output.
+.It Fl req_text , resp_text , text
+Print out the text form of the OCSP request, response, or both, respectively.
+.It Fl reqin Ar file , Fl respin Ar file
+Read an OCSP request or response file from
+.Ar file .
+These options are ignored
+if an OCSP request or response creation is implied by other options
+(for example with the
+.Fl serial , cert ,
+and
+.Fl host
+options).
+.It Fl reqout Ar file , Fl respout Ar file
+Write out the DER-encoded certificate request or response to
+.Ar file .
+.It Fl serial Ar num
+Same as the
+.Fl cert
+option except the certificate with serial number
+.Ar num
+is added to the request.
+The serial number is interpreted as a decimal integer unless preceded by
+.Sq 0x .
+Negative integers can also be specified by preceding the value with a
+.Sq -
+sign.
+.It Fl sign_other Ar file
+Additional certificates to include in the signed request.
+.It Fl signer Ar file , Fl signkey Ar file
+Sign the OCSP request using the certificate specified in the
+.Fl signer
+option and the private key specified by the
+.Fl signkey
+option.
+If the
+.Fl signkey
+option is not present, then the private key is read from the same file
+as the certificate.
+If neither option is specified, the OCSP request is not signed.
+.It Fl trust_other
+The certificates specified by the
+.Fl verify_other
+option should be explicitly trusted and no additional checks will be
+performed on them.
+This is useful when the complete responder certificate chain is not available
+or trusting a root CA is not appropriate.
+.It Fl url Ar responder_url
+Specify the responder URL.
+Both HTTP and HTTPS
+.Pq SSL/TLS
+URLs can be specified.
+.It Fl VAfile Ar file
+.Ar file
+containing explicitly trusted responder certificates.
+Equivalent to the
+.Fl verify_other
+and
+.Fl trust_other
+options.
+.It Fl validity_period Ar nsec , Fl status_age Ar age
+These options specify the range of times, in seconds, which will be tolerated
+in an OCSP response.
+Each certificate status response includes a
+.Em notBefore
+time and an optional
+.Em notAfter
+time.
+The current time should fall between these two values,
+but the interval between the two times may be only a few seconds.
+In practice the OCSP responder and clients' clocks may not be precisely
+synchronised and so such a check may fail.
+To avoid this the
+.Fl validity_period
+option can be used to specify an acceptable error range in seconds,
+the default value is 5 minutes.
+.Pp
+If the
+.Em notAfter
+time is omitted from a response, then this means that new status
+information is immediately available.
+In this case the age of the
+.Em notBefore
+field is checked to see it is not older than
+.Ar age
+seconds old.
+By default, this additional check is not performed.
+.It Fl verify_other Ar file
+.Ar file
+containing additional certificates to search when attempting to locate
+the OCSP response signing certificate.
+Some responders omit the actual signer's certificate from the response;
+this option can be used to supply the necessary certificate in such cases.
+.El
+.Sh OCSP SERVER OPTIONS
+.Bl -tag -width "XXXX"
+.It Fl CA Ar file
+CA certificate corresponding to the revocation information in
+.Ar indexfile .
+.It Fl index Ar indexfile
+.Ar indexfile
+is a text index file in
+.Nm ca
+format containing certificate revocation information.
+.Pp
+If the
+.Fl index
+option is specified, the
+.Nm ocsp
+utility is in
+.Em responder
+mode, otherwise it is in
+.Em client
+mode.
+The request(s) the responder processes can be either specified on
+the command line (using the
+.Fl issuer
+and
+.Fl serial
+options), supplied in a file (using the
+.Fl respin
+option) or via external OCSP clients (if
+.Ar port
+or
+.Ar url
+is specified).
+.Pp
+If the
+.Fl index
+option is present, then the
+.Fl CA
+and
+.Fl rsigner
+options must also be present.
+.It Fl nmin Ar minutes , Fl ndays Ar days
+Number of
+.Ar minutes
+or
+.Ar days
+when fresh revocation information is available: used in the
+.Ar nextUpdate
+field.
+If neither option is present, the
+.Em nextUpdate
+field is omitted, meaning fresh revocation information is immediately available.
+.It Fl nrequest Ar number
+The OCSP server will exit after receiving
+.Ar number
+requests, default unlimited.
+.It Fl port Ar portnum
+Port to listen for OCSP requests on.
+The port may also be specified using the
+.Fl url
+option.
+.It Fl resp_key_id
+Identify the signer certificate using the key ID;
+default is to use the subject name.
+.It Fl resp_no_certs
+Don't include any certificates in the OCSP response.
+.It Fl rkey Ar file
+The private key to sign OCSP responses with;
+if not present, the file specified in the
+.Fl rsigner
+option is used.
+.It Fl rother Ar file
+Additional certificates to include in the OCSP response.
+.It Fl rsigner Ar file
+The certificate to sign OCSP responses with.
+.El
+.Sh OCSP RESPONSE VERIFICATION
+OCSP Response follows the rules specified in RFC 2560.
+.Pp
+Initially the OCSP responder certificate is located and the signature on
+the OCSP request checked using the responder certificate's public key.
+.Pp
+Then a normal certificate verify is performed on the OCSP responder certificate
+building up a certificate chain in the process.
+The locations of the trusted certificates used to build the chain can be
+specified by the
+.Fl CAfile
+and
+.Fl CApath
+options or they will be looked for in the standard
+.Nm OpenSSL
+certificates
+directory.
+.Pp
+If the initial verify fails, the OCSP verify process halts with an
+error.
+.Pp
+Otherwise the issuing CA certificate in the request is compared to the OCSP
+responder certificate: if there is a match then the OCSP verify succeeds.
+.Pp
+Otherwise the OCSP responder certificate's CA is checked against the issuing
+CA certificate in the request.
+If there is a match and the OCSPSigning extended key usage is present
+in the OCSP responder certificate, then the OCSP verify succeeds.
+.Pp
+Otherwise the root CA of the OCSP responder's CA is checked to see if it
+is trusted for OCSP signing.
+If it is, the OCSP verify succeeds.
+.Pp
+If none of these checks is successful, the OCSP verify fails.
+.Pp
+What this effectively means is that if the OCSP responder certificate is
+authorised directly by the CA it is issuing revocation information about
+.Pq and it is correctly configured ,
+then verification will succeed.
+.Pp
+If the OCSP responder is a
+.Em global responder
+which can give details about multiple CAs and has its own separate
+certificate chain, then its root CA can be trusted for OCSP signing.
+For example:
+.Bd -literal -offset indent
+$ openssl x509 -in ocspCA.pem -addtrust OCSPSigning \e
+        -out trustedCA.pem
+.Ed
+.Pp
+Alternatively, the responder certificate itself can be explicitly trusted
+with the
+.Fl VAfile
+option.
+.Sh OCSP NOTES
+As noted, most of the verify options are for testing or debugging purposes.
+Normally, only the
+.Fl CApath , CAfile
+and
+.Pq if the responder is a `global VA'
+.Fl VAfile
+options need to be used.
+.Pp
+The OCSP server is only useful for test and demonstration purposes:
+it is not really usable as a full OCSP responder.
+It contains only a very simple HTTP request handling and can only handle
+the POST form of OCSP queries.
+It also handles requests serially, meaning it cannot respond to
+new requests until it has processed the current one.
+The text index file format of revocation is also inefficient for large
+quantities of revocation data.
+.Pp
+It is possible to run the
+.Nm ocsp
+application in
+.Em responder
+mode via a CGI script using the
+.Fl respin
+and
+.Fl respout
+options.
+.Sh OCSP EXAMPLES
+Create an OCSP request and write it to a file:
+.Bd -literal -offset indent
+$ openssl ocsp -issuer issuer.pem -cert c1.pem -cert c2.pem \e
+        -reqout req.der
+.Ed
+.Pp
+Send a query to an OCSP responder with URL
+.Pa http://ocsp.myhost.com/ ,
+save the response to a file and print it out in text form:
+.Bd -literal -offset indent
+$ openssl ocsp -issuer issuer.pem -cert c1.pem -cert c2.pem \e
+        -url http://ocsp.myhost.com/ -resp_text -respout resp.der
+.Ed
+.Pp
+Read in an OCSP response and print out in text form:
+.Pp
+.Dl $ openssl ocsp -respin resp.der -text
+.Pp
+OCSP server on port 8888 using a standard
+.Nm ca
+configuration, and a separate responder certificate.
+All requests and responses are printed to a file:
+.Bd -literal -offset indent
+$ openssl ocsp -index demoCA/index.txt -port 8888 -rsigner \e
+        rcert.pem -CA demoCA/cacert.pem -text -out log.txt
+.Ed
+.Pp
+As above, but exit after processing one request:
+.Bd -literal -offset indent
+$ openssl ocsp -index demoCA/index.txt -port 8888 -rsigner \e
+        rcert.pem -CA demoCA/cacert.pem -nrequest 1
+.Ed
+.Pp
+Query status information using internally generated request:
+.Bd -literal -offset indent
+$ openssl ocsp -index demoCA/index.txt -rsigner rcert.pem -CA \e
+        demoCA/cacert.pem -issuer demoCA/cacert.pem -serial 1
+.Ed
+.Pp
+Query status information using request read from a file and write
+the response to a second file:
+.Bd -literal -offset indent
+$ openssl ocsp -index demoCA/index.txt -rsigner rcert.pem -CA \e
+        demoCA/cacert.pem -reqin req.der -respout resp.der
+.Ed
+.\"
+.\" PASSWD
+.\"
+.Sh PASSWD
+.nr nS 1
+.Nm "openssl passwd"
+.Op Fl 1 | apr1 | crypt
+.Op Fl in Ar file
+.Op Fl noverify
+.Op Fl quiet
+.Op Fl reverse
+.Op Fl salt Ar string
+.Op Fl stdin
+.Op Fl table
+.Op Ar password
+.nr nS 0
+.Pp
+The
+.Nm passwd
+command computes the hash of a password typed at run-time
+or the hash of each password in a list.
+The password list is taken from the named
+.Ar file
+for option
+.Fl in ,
+from stdin for option
+.Fl stdin ,
+or from the command line, or from the terminal otherwise.
+The
+.Ux
+standard algorithm
+.Em crypt
+and the MD5-based
+.Bx
+password algorithm
+.Em 1
+and its Apache variant
+.Em apr1
+are available.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl 1
+Use the MD5 based
+.Bx
+password algorithm
+.Em 1 .
+.It Fl apr1
+Use the
+.Em apr1
+algorithm
+.Pq Apache variant of the
+.Bx
+algorithm.
+.It Fl crypt
+Use the
+.Em crypt
+algorithm
+.Pq default .
+.It Fl in Ar file
+Read passwords from
+.Ar file .
+.It Fl noverify
+Don't verify when reading a password from the terminal.
+.It Fl quiet
+Don't output warnings when passwords given on the command line are truncated.
+.It Fl reverse
+Switch table columns.
+This only makes sense in conjunction with the
+.Fl table
+option.
+.It Fl salt Ar string
+Use the specified
+.Ar salt .
+When reading a password from the terminal, this implies
+.Fl noverify .
+.It Fl stdin
+Read passwords from
+.Em stdin .
+.It Fl table
+In the output list, prepend the cleartext password and a TAB character
+to each password hash.
+.El
+.Sh PASSWD EXAMPLES
+.Dl $ openssl passwd -crypt -salt xx password
+prints
+.Qq xxj31ZMTZzkVA .
+.Pp
+.Dl $ openssl passwd -1 -salt xxxxxxxx password
+prints
+.Qq $1$xxxxxxxx$UYCIxa628.9qXjpQCjM4a. .
+.Pp
+.Dl $ openssl passwd -apr1 -salt xxxxxxxx password
+prints
+.Qq $apr1$xxxxxxxx$dxHfLAsjHkDRmG83UXe8K0 .
+.\"
+.\" PKCS7
+.\"
+.Sh PKCS7
+.nr nS 1
+.Nm "openssl pkcs7"
+.Bk -words
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl print_certs
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm pkcs7
+command processes PKCS#7 files in DER or PEM format.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm pkcs7
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read from, or standard input if this option is not specified.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+.Ar DER
+format is a DER-encoded PKCS#7 v1.5 structure.
+.Ar PEM
+.Pq the default
+is a base64-encoded version of the DER form with header and footer lines.
+.It Fl noout
+Don't output the encoded version of the PKCS#7 structure
+(or certificates if
+.Fl print_certs
+is set).
+.It Fl out Ar file
+Specifies the output
+.Ar file
+to write to, or standard output by default.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl print_certs
+Prints out any certificates or CRLs contained in the file.
+They are preceded by their subject and issuer names in a one-line format.
+.It Fl text
+Prints out certificate details in full rather than just subject and
+issuer names.
+.El
+.Sh PKCS7 EXAMPLES
+Convert a PKCS#7 file from PEM to DER:
+.Pp
+.Dl $ openssl pkcs7 -in file.pem -outform DER -out file.der
+.Pp
+Output all certificates in a file:
+.Pp
+.Dl $ openssl pkcs7 -in file.pem -print_certs -out certs.pem
+.Sh PKCS7 NOTES
+The PEM PKCS#7 format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN PKCS7-----
+-----END PKCS7-----
+.Ed
+.Pp
+For compatibility with some CAs it will also accept:
+.Bd -unfilled -offset indent
+-----BEGIN CERTIFICATE-----
+-----END CERTIFICATE-----
+.Ed
+.Sh PKCS7 RESTRICTIONS
+There is no option to print out all the fields of a PKCS#7 file.
+.Pp
+The PKCS#7 routines only understand PKCS#7 v 1.5 as specified in RFC 2315.
+They cannot currently parse, for example, the new CMS as described in RFC 2630.
+.\"
+.\" PKCS8
+.\"
+.Sh PKCS8
+.nr nS 1
+.Nm "openssl pkcs8"
+.Bk -words
+.Op Fl embed
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl nocrypt
+.Op Fl noiter
+.Op Fl nooct
+.Op Fl nsdb
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl passin Ar arg
+.Op Fl passout Ar arg
+.Op Fl topk8
+.Op Fl v1 Ar alg
+.Op Fl v2 Ar alg
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm pkcs8
+command processes private keys in PKCS#8 format.
+It can handle both unencrypted PKCS#8 PrivateKeyInfo format
+and EncryptedPrivateKeyInfo format with a variety of PKCS#5
+.Pq v1.5 and v2.0
+and PKCS#12 algorithms.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl embed
+This option generates DSA keys in a broken format.
+The DSA parameters are embedded inside the
+.Em PrivateKey
+structure.
+In this form the OCTET STRING contains an ASN1 SEQUENCE consisting of
+two structures:
+a SEQUENCE containing the parameters and an ASN1 INTEGER containing
+the private key.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm pkcs8
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read a key from, or standard input if this option is not specified.
+If the key is encrypted, a pass phrase will be prompted for.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+If a PKCS#8 format key is expected on input,
+then either a
+DER- or PEM-encoded version of a PKCS#8 key will be expected.
+Otherwise the DER or PEM format of the traditional format private key is used.
+.It Fl nocrypt
+PKCS#8 keys generated or input are normally PKCS#8
+.Em EncryptedPrivateKeyInfo
+structures using an appropriate password-based encryption algorithm.
+With this option, an unencrypted
+.Em PrivateKeyInfo
+structure is expected or output.
+This option does not encrypt private keys at all and should only be used
+when absolutely necessary.
+Certain software such as some versions of Java code signing software use
+unencrypted private keys.
+.It Fl noiter
+Use an iteration count of 1.
+See the
+.Sx PKCS12
+section below for a detailed explanation of this option.
+.It Fl nooct
+This option generates RSA private keys in a broken format that some software
+uses.
+Specifically the private key should be enclosed in an OCTET STRING,
+but some software just includes the structure itself without the
+surrounding OCTET STRING.
+.It Fl nsdb
+This option generates DSA keys in a broken format compatible with Netscape
+private key databases.
+The
+.Em PrivateKey
+contains a SEQUENCE consisting of the public and private keys, respectively.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write a key to, or standard output by default.
+If any encryption options are set, a pass phrase will be prompted for.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl topk8
+Normally, a PKCS#8 private key is expected on input and a traditional format
+private key will be written.
+With the
+.Fl topk8
+option the situation is reversed:
+it reads a traditional format private key and writes a PKCS#8 format key.
+.It Fl v1 Ar alg
+This option specifies a PKCS#5 v1.5 or PKCS#12 algorithm to use.
+A complete list of possible algorithms is included below.
+.It Fl v2 Ar alg
+This option enables the use of PKCS#5 v2.0 algorithms.
+Normally, PKCS#8 private keys are encrypted with the password-based
+encryption algorithm called
+.Em pbeWithMD5AndDES-CBC ;
+this uses 56-bit DES encryption but it was the strongest encryption
+algorithm supported in PKCS#5 v1.5.
+Using the
+.Fl v2
+option PKCS#5 v2.0 algorithms are used which can use any
+encryption algorithm such as 168-bit triple DES or 128-bit RC2, however
+not many implementations support PKCS#5 v2.0 yet.
+If using private keys with
+.Nm OpenSSL
+then this doesn't matter.
+.Pp
+The
+.Ar alg
+argument is the encryption algorithm to use; valid values include
+.Ar des , des3 ,
+and
+.Ar rc2 .
+It is recommended that
+.Ar des3
+is used.
+.El
+.Sh PKCS8 NOTES
+The encrypted form of a PEM-encoded PKCS#8 file uses the following
+headers and footers:
+.Bd -unfilled -offset indent
+-----BEGIN ENCRYPTED PRIVATE KEY-----
+-----END ENCRYPTED PRIVATE KEY-----
+.Ed
+.Pp
+The unencrypted form uses:
+.Bd -unfilled -offset indent
+-----BEGIN PRIVATE KEY-----
+-----END PRIVATE KEY-----
+.Ed
+.Pp
+Private keys encrypted using PKCS#5 v2.0 algorithms and high iteration
+counts are more secure than those encrypted using the traditional
+.Nm SSLeay
+compatible formats.
+So if additional security is considered important, the keys should be converted.
+.Pp
+The default encryption is only 56 bits because this is the encryption
+that most current implementations of PKCS#8 support.
+.Pp
+Some software may use PKCS#12 password-based encryption algorithms
+with PKCS#8 format private keys: these are handled automatically
+but there is no option to produce them.
+.Pp
+It is possible to write out
+DER-encoded encrypted private keys in PKCS#8 format because the encryption
+details are included at an ASN1
+level whereas the traditional format includes them at a PEM level.
+.Sh PKCS#5 V1.5 AND PKCS#12 ALGORITHMS
+Various algorithms can be used with the
+.Fl v1
+command line option, including PKCS#5 v1.5 and PKCS#12.
+These are described in more detail below.
+.Pp
+.Bl -tag -width "XXXX" -compact
+.It Ar PBE-MD2-DES | PBE-MD5-DES
+These algorithms were included in the original PKCS#5 v1.5 specification.
+They only offer 56 bits of protection since they both use DES.
+.Pp
+.It Ar PBE-SHA1-RC2-64 | PBE-MD2-RC2-64 | PBE-MD5-RC2-64 | PBE-SHA1-DES
+These algorithms are not mentioned in the original PKCS#5 v1.5 specification
+but they use the same key derivation algorithm and are supported by some
+software.
+They are mentioned in PKCS#5 v2.0.
+They use either 64-bit RC2 or 56-bit DES.
+.Pp
+.It Ar PBE-SHA1-RC4-128 | PBE-SHA1-RC4-40 | PBE-SHA1-3DES | PBE-SHA1-2DES
+.It Ar PBE-SHA1-RC2-128 | PBE-SHA1-RC2-40
+These algorithms use the PKCS#12 password-based encryption algorithm and
+allow strong encryption algorithms like triple DES or 128-bit RC2 to be used.
+.El
+.Sh PKCS8 EXAMPLES
+Convert a private key from traditional to PKCS#5 v2.0 format using triple DES:
+.Pp
+.Dl "$ openssl pkcs8 -in key.pem -topk8 -v2 des3 -out enckey.pem"
+.Pp
+Convert a private key to PKCS#8 using a PKCS#5 1.5 compatible algorithm
+.Pq DES :
+.Pp
+.Dl $ openssl pkcs8 -in key.pem -topk8 -out enckey.pem
+.Pp
+Convert a private key to PKCS#8 using a PKCS#12 compatible algorithm
+.Pq 3DES :
+.Bd -literal -offset indent
+$ openssl pkcs8 -in key.pem -topk8 -out enckey.pem \e
+        -v1 PBE-SHA1-3DES
+.Ed
+.Pp
+Read a DER-unencrypted PKCS#8 format private key:
+.Pp
+.Dl "$ openssl pkcs8 -inform DER -nocrypt -in key.der -out key.pem"
+.Pp
+Convert a private key from any PKCS#8 format to traditional format:
+.Pp
+.Dl $ openssl pkcs8 -in pk8.pem -out key.pem
+.Sh PKCS8 STANDARDS
+Test vectors from this PKCS#5 v2.0 implementation were posted to the
+pkcs-tng mailing list using triple DES, DES and RC2 with high iteration counts;
+several people confirmed that they could decrypt the private
+keys produced and therefore it can be assumed that the PKCS#5 v2.0
+implementation is reasonably accurate at least as far as these
+algorithms are concerned.
+.Pp
+The format of PKCS#8 DSA
+.Pq and other
+private keys is not well documented:
+it is hidden away in PKCS#11 v2.01, section 11.9;
+.Nm OpenSSL Ns Li 's
+default DSA PKCS#8 private key format complies with this standard.
+.Sh PKCS8 BUGS
+There should be an option that prints out the encryption algorithm
+in use and other details such as the iteration count.
+.Pp
+PKCS#8 using triple DES and PKCS#5 v2.0 should be the default private
+key format; for
+.Nm OpenSSL
+compatibility, several of the utilities use the old format at present.
+.\"
+.\" PKCS12
+.\"
+.Sh PKCS12
+.nr nS 1
+.Nm "openssl pkcs12"
+.Bk -words
+.Oo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Oc
+.Op Fl cacerts
+.Op Fl CAfile Ar file
+.Op Fl caname Ar name
+.Op Fl CApath Ar directory
+.Op Fl certfile Ar file
+.Op Fl certpbe Ar alg
+.Op Fl chain
+.Op Fl clcerts
+.Op Fl CSP Ar name
+.Op Fl descert
+.Op Fl engine Ar id
+.Op Fl export
+.Op Fl in Ar file
+.Op Fl info
+.Op Fl inkey Ar file
+.Op Fl keyex
+.Op Fl keypbe Ar alg
+.Op Fl keysig
+.Op Fl macalg Ar alg
+.Op Fl maciter
+.Op Fl name Ar name
+.Op Fl nocerts
+.Op Fl nodes
+.Op Fl noiter
+.Op Fl nokeys
+.Op Fl nomac
+.Op Fl nomaciter
+.Op Fl nomacver
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl passin Ar arg
+.Op Fl passout Ar arg
+.Op Fl rand Ar
+.Op Fl twopass
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm pkcs12
+command allows PKCS#12 files
+.Pq sometimes referred to as PFX files
+to be created and parsed.
+PKCS#12 files are used by several programs including Netscape, MSIE
+and MS Outlook.
+.Pp
+There are a lot of options; the meaning of some depends on whether a
+PKCS#12 file is being created or parsed.
+By default, a PKCS#12 file is parsed;
+a PKCS#12 file can be created by using the
+.Fl export
+option
+.Pq see below .
+.Sh PKCS12 PARSING OPTIONS
+.Bl -tag -width "XXXX"
+.It Xo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Xc
+Use AES, DES, or triple DES, respectively,
+to encrypt private keys before outputting.
+The default is triple DES.
+.It Fl cacerts
+Only output CA certificates
+.Pq not client certificates .
+.It Fl clcerts
+Only output client certificates
+.Pq not CA certificates .
+.It Fl in Ar file
+This specifies the
+.Ar file
+of the PKCS#12 file to be parsed.
+Standard input is used by default.
+.It Fl info
+Output additional information about the PKCS#12 file structure,
+algorithms used, and iteration counts.
+.It Fl nocerts
+No certificates at all will be output.
+.It Fl nodes
+Don't encrypt the private keys at all.
+.It Fl nokeys
+No private keys will be output.
+.It Fl nomacver
+Don't attempt to verify the integrity MAC before reading the file.
+.It Fl noout
+This option inhibits output of the keys and certificates to the output file
+version of the PKCS#12 file.
+.It Fl out Ar file
+The
+.Ar file
+to write certificates and private keys to, standard output by default.
+They are all written in PEM format.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl twopass
+Prompt for separate integrity and encryption passwords: most software
+always assumes these are the same so this option will render such
+PKCS#12 files unreadable.
+.El
+.Sh PKCS12 FILE CREATION OPTIONS
+.Bl -tag -width "XXXX"
+.It Fl CAfile Ar file
+CA storage as a file.
+.It Fl CApath Ar directory
+CA storage as a directory.
+This directory must be a standard certificate directory:
+that is, a hash of each subject name (using
+.Cm x509 -hash )
+should be linked to each certificate.
+.It Fl caname Ar name
+This specifies the
+.Qq friendly name
+for other certificates.
+This option may be used multiple times to specify names for all certificates
+in the order they appear.
+Netscape ignores friendly names on other certificates,
+whereas MSIE displays them.
+.It Fl certfile Ar file
+A file to read additional certificates from.
+.It Fl certpbe Ar alg , Fl keypbe Ar alg
+These options allow the algorithm used to encrypt the private key and
+certificates to be selected.
+Any PKCS#5 v1.5 or PKCS#12 PBE algorithm name can be used (see the
+.Sx PKCS12 NOTES
+section for more information).
+If a cipher name
+(as output by the
+.Cm list-cipher-algorithms
+command) is specified then it
+is used with PKCS#5 v2.0.
+For interoperability reasons it is advisable to only use PKCS#12 algorithms.
+.It Fl chain
+If this option is present, an attempt is made to include the entire
+certificate chain of the user certificate.
+The standard CA store is used for this search.
+If the search fails, it is considered a fatal error.
+.It Fl CSP Ar name
+Write
+.Ar name
+as a Microsoft CSP name.
+.It Fl descert
+Encrypt the certificate using triple DES; this may render the PKCS#12
+file unreadable by some
+.Qq export grade
+software.
+By default, the private key is encrypted using triple DES and the
+certificate using 40-bit RC2.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm pkcs12
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl export
+This option specifies that a PKCS#12 file will be created rather than
+parsed.
+.It Fl in Ar file
+The
+.Ar file
+to read certificates and private keys from, standard input by default.
+They must all be in PEM format.
+The order doesn't matter but one private key and its corresponding
+certificate should be present.
+If additional certificates are present, they will also be included
+in the PKCS#12 file.
+.It Fl inkey Ar file
+File to read private key from.
+If not present, a private key must be present in the input file.
+.It Fl keyex | keysig
+Specifies that the private key is to be used for key exchange or just signing.
+This option is only interpreted by MSIE and similar MS software.
+Normally,
+.Qq export grade
+software will only allow 512-bit RSA keys to be
+used for encryption purposes, but arbitrary length keys for signing.
+The
+.Fl keysig
+option marks the key for signing only.
+Signing only keys can be used for S/MIME signing, authenticode
+.Pq ActiveX control signing
+and SSL client authentication;
+however, due to a bug only MSIE 5.0 and later support
+the use of signing only keys for SSL client authentication.
+.It Fl macalg Ar alg
+Specify the MAC digest algorithm.
+If not included then SHA1 is used.
+.It Fl maciter
+This option is included for compatibility with previous versions; it used
+to be needed to use MAC iterations counts but they are now used by default.
+.It Fl name Ar name
+This specifies the
+.Qq friendly name
+for the certificate and private key.
+This name is typically displayed in list boxes by software importing the file.
+.It Fl nomac
+Don't attempt to provide the MAC integrity.
+.It Fl nomaciter , noiter
+These options affect the iteration counts on the MAC and key algorithms.
+Unless you wish to produce files compatible with MSIE 4.0, you should leave
+these options alone.
+.Pp
+To discourage attacks by using large dictionaries of common passwords,
+the algorithm that derives keys from passwords can have an iteration count
+applied to it: this causes a certain part of the algorithm to be repeated
+and slows it down.
+The MAC is used to check the file integrity but since it will normally
+have the same password as the keys and certificates it could also be attacked.
+By default, both MAC and encryption iteration counts are set to 2048;
+using these options the MAC and encryption iteration counts can be set to 1.
+Since this reduces the file security you should not use these options
+unless you really have to.
+Most software supports both MAC and key iteration counts.
+MSIE 4.0 doesn't support MAC iteration counts, so it needs the
+.Fl nomaciter
+option.
+.It Fl out Ar file
+This specifies
+.Ar file
+to write the PKCS#12 file to.
+Standard output is used by default.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl rand Ar
+A file or files
+containing random data used to seed the random number generator,
+or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.El
+.Sh PKCS12 NOTES
+Although there are a large number of options,
+most of them are very rarely used.
+For PKCS#12 file parsing, only
+.Fl in
+and
+.Fl out
+need to be used for PKCS#12 file creation.
+.Fl export
+and
+.Fl name
+are also used.
+.Pp
+If none of the
+.Fl clcerts , cacerts ,
+or
+.Fl nocerts
+options are present, then all certificates will be output in the order
+they appear in the input PKCS#12 files.
+There is no guarantee that the first certificate present is
+the one corresponding to the private key.
+Certain software which requires a private key and certificate and assumes
+the first certificate in the file is the one corresponding to the private key:
+this may not always be the case.
+Using the
+.Fl clcerts
+option will solve this problem by only outputting the certificate
+corresponding to the private key.
+If the CA certificates are required, they can be output to a separate
+file using the
+.Fl nokeys
+and
+.Fl cacerts
+options to just output CA certificates.
+.Pp
+The
+.Fl keypbe
+and
+.Fl certpbe
+algorithms allow the precise encryption algorithms for private keys
+and certificates to be specified.
+Normally, the defaults are fine but occasionally software can't handle
+triple DES encrypted private keys;
+then the option
+.Fl keypbe Ar PBE-SHA1-RC2-40
+can be used to reduce the private key encryption to 40-bit RC2.
+A complete description of all algorithms is contained in the
+.Sx PKCS8
+section above.
+.Sh PKCS12 EXAMPLES
+Parse a PKCS#12 file and output it to a file:
+.Pp
+.Dl $ openssl pkcs12 -in file.p12 -out file.pem
+.Pp
+Output only client certificates to a file:
+.Pp
+.Dl $ openssl pkcs12 -in file.p12 -clcerts -out file.pem
+.Pp
+Don't encrypt the private key:
+.Pp
+.Dl $ openssl pkcs12 -in file.p12 -out file.pem -nodes
+.Pp
+Print some info about a PKCS#12 file:
+.Pp
+.Dl $ openssl pkcs12 -in file.p12 -info -noout
+.Pp
+Create a PKCS#12 file:
+.Bd -literal -offset indent
+$ openssl pkcs12 -export -in file.pem -out file.p12 \e
+        -name "My Certificate"
+.Ed
+.Pp
+Include some extra certificates:
+.Bd -literal -offset indent
+$ openssl pkcs12 -export -in file.pem -out file.p12 \e
+        -name "My Certificate" -certfile othercerts.pem
+.Ed
+.Sh PKCS12 BUGS
+Some would argue that the PKCS#12 standard is one big bug :\-)
+.Pp
+Versions of
+.Nm OpenSSL
+before 0.9.6a had a bug in the PKCS#12 key generation routines.
+Under rare circumstances this could produce a PKCS#12 file encrypted
+with an invalid key.
+As a result some PKCS#12 files which triggered this bug
+from other implementations
+.Pq MSIE or Netscape
+could not be decrypted by
+.Nm OpenSSL
+and similarly
+.Nm OpenSSL
+could produce PKCS#12 files which could not be decrypted by other
+implementations.
+The chances of producing such a file are relatively small: less than 1 in 256.
+.Pp
+A side effect of fixing this bug is that any old invalidly encrypted PKCS#12
+files can no longer be parsed by the fixed version.
+Under such circumstances the
+.Nm pkcs12
+utility will report that the MAC is OK but fail with a decryption
+error when extracting private keys.
+.Pp
+This problem can be resolved by extracting the private keys and certificates
+from the PKCS#12 file using an older version of
+.Nm OpenSSL
+and recreating
+the PKCS#12 file from the keys and certificates using a newer version of
+.Nm OpenSSL .
+For example:
+.Bd -literal -offset indent
+$ old-openssl -in bad.p12 -out keycerts.pem
+$ openssl -in keycerts.pem -export -name "My PKCS#12 file" \e
+        -out fixed.p12
+.Ed
+.\"
+.\" PKEY
+.\"
+.Sh PKEY
+.nr nS 1
+.Nm "openssl pkey"
+.Bk -words
+.Op Ar cipher
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl passin Ar arg
+.Op Fl passout Ar arg
+.Op Fl pubin
+.Op Fl pubout
+.Op Fl text
+.Op Fl text_pub
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm pkey
+command processes public or private keys.
+They can be converted between various forms
+and their components printed out.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Ar cipher
+These options encrypt the private key with the supplied cipher.
+Any algorithm name accepted by
+.Fn EVP_get_cipherbyname
+is acceptable, such as
+.Cm des3 .
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm pkey
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input filename to read a key from,
+or standard input if this option is not specified.
+If the key is encrypted a pass phrase will be prompted for.
+.It Fl inform Ar DER | PEM
+This specifies the input format, DER or PEM.
+.It Fl noout
+Do not output the encoded version of the key.
+.It Fl out Ar file
+This specifies the output filename to write a key to,
+or standard output if this option is not specified.
+If any encryption options are set then a pass phrase
+will be prompted for.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | PEM
+This specifies the output format;
+the options have the same meaning as the
+.Fl inform
+option.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl pubin
+By default a private key is read from the input file:
+with this option a public key is read instead.
+.It Fl pubout
+By default a private key is output:
+with this option a public key will be output instead.
+This option is automatically set if
+the input is a public key.
+.It Fl text
+Print out the various public or private key components in
+plain text in addition to the encoded version.
+.It Fl text_pub
+Print out only public key components
+even if a private key is being processed.
+.El
+.Sh PKEY EXAMPLES
+To remove the pass phrase on an RSA private key:
+.Bd -literal -offset indent
+$ openssl pkey -in key.pem -out keyout.pem
+.Ed
+.Pp
+To encrypt a private key using triple DES:
+.Bd -literal -offset indent
+$ openssl pkey -in key.pem -des3 -out keyout.pem
+.Ed
+.Pp
+To convert a private key from PEM to DER format:
+.Bd -literal -offset indent
+$ openssl pkey -in key.pem -outform DER -out keyout.der
+.Ed
+.Pp
+To print the components of a private key to standard output:
+.Bd -literal -offset indent
+$ openssl pkey -in key.pem -text -noout
+.Ed
+.Pp
+To print the public components of a private key to standard output:
+.Bd -literal -offset indent
+$ openssl pkey -in key.pem -text_pub -noout
+.Ed
+.Pp
+To just output the public part of a private key:
+.Bd -literal -offset indent
+$ openssl pkey -in key.pem -pubout -out pubkey.pem
+.Ed
+.\"
+.\" PKEYPARAM
+.\"
+.Sh PKEYPARAM
+.Cm openssl pkeyparam
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl text
+.Pp
+The
+.Nm pkey
+command processes public or private keys.
+They can be converted between various forms and their components printed out.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm pkeyparam
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input filename to read parameters from,
+or standard input if this option is not specified.
+.It Fl noout
+Do not output the encoded version of the parameters.
+.It Fl out Ar file
+This specifies the output filename to write parameters to,
+or standard output if this option is not specified.
+.It Fl text
+Prints out the parameters in plain text in addition to the encoded version.
+.El
+.Sh PKEYPARAM EXAMPLES
+Print out text version of parameters:
+.Bd -literal -offset indent
+$ openssl pkeyparam -in param.pem -text
+.Ed
+.Sh PKEYPARAM NOTES
+There are no
+.Fl inform
+or
+.Fl outform
+options for this command because only PEM format is supported
+because the key type is determined by the PEM headers.
+.\"
+.\" PKEYUTL
+.\"
+.Sh PKEYUTL
+.nr nS 1
+.Nm "openssl pkeyutl"
+.Bk -words
+.Op Fl asn1parse
+.Op Fl certin
+.Op Fl decrypt
+.Op Fl derive
+.Op Fl encrypt
+.Op Fl engine Ar id
+.Op Fl hexdump
+.Op Fl in Ar file
+.Op Fl inkey Ar file
+.Op Fl keyform Ar DER | ENGINE | PEM
+.Op Fl out Ar file
+.Op Fl passin Ar arg
+.Op Fl peerform Ar DER | ENGINE | PEM
+.Op Fl peerkey Ar file
+.Op Fl pkeyopt Ar opt : Ns Ar value
+.Op Fl pubin
+.Op Fl rev
+.Op Fl sigfile Ar file
+.Op Fl sign
+.Op Fl verify
+.Op Fl verifyrecover
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm pkeyutl
+command can be used to perform public key operations using
+any supported algorithm.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl asn1parse
+ASN1parse the output data.
+This is useful when combined with the
+.Fl verifyrecover
+option when an ASN1 structure is signed.
+.It Fl certin
+The input is a certificate containing a public key.
+.It Fl decrypt
+Decrypt the input data using a private key.
+.It Fl derive
+Derive a shared secret using the peer key.
+.It Fl encrypt
+Encrypt the input data using a public key.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm pkeyutl
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl hexdump
+Hex dump the output data.
+.It Fl in Ar file
+Specify the input filename to read data from,
+or standard input if this option is not specified.
+.It Fl inkey Ar file
+The input key file.
+By default it should be a private key.
+.It Fl keyform Ar DER | ENGINE | PEM
+The key format DER, ENGINE, or PEM.
+.It Fl out Ar file
+Specify the output filename to write to,
+or standard output by default.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl peerform Ar DER | ENGINE | PEM
+The peer key format DER, ENGINE, or PEM.
+.It Fl peerkey Ar file
+The peer key file, used by key derivation (agreement) operations.
+.It Fl pkeyopt Ar opt : Ns Ar value
+Public key options.
+.It Fl pubin
+The input file is a public key.
+.It Fl rev
+Reverse the order of the input buffer.
+This is useful for some libraries (such as CryptoAPI)
+which represent the buffer in little endian format.
+.It Fl sigfile Ar file
+Signature file (verify operation only).
+.It Fl sign
+Sign the input data and output the signed result.
+This requires a private key.
+.It Fl verify
+Verify the input data against the signature file and indicate if the
+verification succeeded or failed.
+.It Fl verifyrecover
+Verify the input data and output the recovered data.
+.El
+.Sh PKEYUTL NOTES
+The operations and options supported vary according to the key algorithm
+and its implementation.
+The
+.Nm OpenSSL
+operations and options are indicated below.
+.Pp
+Unless otherwise mentioned all algorithms support the
+.Ar digest : Ns Ar alg
+option which specifies the digest in use
+for sign, verify, and verifyrecover operations.
+The value
+.Ar alg
+should represent a digest name as used in the
+.Fn EVP_get_digestbyname
+function, for example
+.Cm sha1 .
+.Ss RSA algorithm
+The RSA algorithm supports the
+encrypt, decrypt, sign, verify, and verifyrecover operations in general.
+Some padding modes only support some of these
+operations however.
+.Bl -tag -width Ds
+.It rsa_padding_mode : Ns Ar mode
+This sets the RSA padding mode.
+Acceptable values for
+.Ar mode
+are
+.Cm pkcs1
+for PKCS#1 padding;
+.Cm sslv3
+for SSLv3 padding;
+.Cm none
+for no padding;
+.Cm oaep
+for OAEP mode;
+.Cm x931
+for X9.31 mode;
+and
+.Cm pss
+for PSS.
+.Pp
+In PKCS#1 padding if the message digest is not set then the supplied data is
+signed or verified directly instead of using a DigestInfo structure.
+If a digest is set then a DigestInfo
+structure is used and its length
+must correspond to the digest type.
+.Pp
+For oeap mode only encryption and decryption is supported.
+.Pp
+For x931 if the digest type is set it is used to format the block data;
+otherwise the first byte is used to specify the X9.31 digest ID.
+Sign, verify, and verifyrecover can be performed in this mode.
+.Pp
+For pss mode only sign and verify are supported and the digest type must be
+specified.
+.It rsa_pss_saltlen : Ns Ar len
+For pss
+mode only this option specifies the salt length.
+Two special values are supported:
+-1 sets the salt length to the digest length.
+When signing -2 sets the salt length to the maximum permissible value.
+When verifying -2 causes the salt length to be automatically determined
+based on the PSS block structure.
+.El
+.Ss DSA algorithm
+The DSA algorithm supports the sign and verify operations.
+Currently there are no additional options other than
+.Ar digest .
+Only the SHA1 digest can be used and this digest is assumed by default.
+.Ss DH algorithm
+The DH algorithm supports the derive operation
+and no additional options.
+.Ss EC algorithm
+The EC algorithm supports the sign, verify, and derive operations.
+The sign and verify operations use ECDSA and derive uses ECDH.
+Currently there are no additional options other than
+.Ar digest .
+Only the SHA1 digest can be used and this digest is assumed by default.
+.Sh PKEYUTL EXAMPLES
+Sign some data using a private key:
+.Bd -literal -offset indent
+$ openssl pkeyutl -sign -in file -inkey key.pem -out sig
+.Ed
+.Pp
+Recover the signed data (e.g. if an RSA key is used):
+.Bd -literal -offset indent
+$ openssl pkeyutl -verifyrecover -in sig -inkey key.pem
+.Ed
+.Pp
+Verify the signature (e.g. a DSA key):
+.Bd -literal -offset indent
+$ openssl pkeyutl -verify -in file -sigfile sig \e
+        -inkey key.pem
+.Ed
+.Pp
+Sign data using a message digest value (this is currently only valid for RSA):
+.Bd -literal -offset indent
+$ openssl pkeyutl -sign -in file -inkey key.pem \e
+        -out sig -pkeyopt digest:sha256
+.Ed
+.Pp
+Derive a shared secret value:
+.Bd -literal -offset indent
+$ openssl pkeyutl -derive -inkey key.pem \e
+        -peerkey pubkey.pem -out secret
+.Ed
+.\"
+.\" PRIME
+.\"
+.Sh PRIME
+.Cm openssl prime
+.Op Fl bits Ar n
+.Op Fl checks Ar n
+.Op Fl generate
+.Op Fl hex
+.Op Fl safe
+.Ar p
+.Pp
+The
+.Nm prime
+command is used to generate prime numbers,
+or to check numbers for primality.
+Results are probabilistic:
+they have an exceedingly high likelihood of being correct,
+but are not guaranteed.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl bits Ar n
+Specify the number of bits in the generated prime number.
+Must be used in conjunction with
+.Fl generate .
+.It Fl checks Ar n
+Perform a Miller-Rabin probabilistic primality test with
+.Ar n
+iterations.
+The default is 20.
+.It Fl generate
+Generate a pseudo-random prime number.
+Must be used in conjunction with
+.Fl bits .
+.It Fl hex
+Output in hex format.
+.It Fl safe
+Generate only
+.Qq safe
+prime numbers
+(i.e. a prime p so that (p-1)/2 is also prime).
+.It Ar p
+Test if number
+.Ar p
+is prime.
+.El
+.\"
+.\" RAND
+.\"
+.Sh RAND
+.nr nS 1
+.Nm "openssl rand"
+.Op Fl base64
+.Op Fl engine Ar id
+.Op Fl hex
+.Op Fl out Ar file
+.Op Fl rand Ar
+.Ar num
+.nr nS 0
+.Pp
+The
+.Nm rand
+command outputs
+.Ar num
+pseudo-random bytes after seeding
+the random number generator once.
+As in other
+.Nm openssl
+command line tools, PRNG seeding uses the file
+.Pa $HOME/.rnd
+or
+.Pa .rnd
+in addition to the files given in the
+.Fl rand
+option.
+A new
+.Pa $HOME/.rnd
+or
+.Pa .rnd
+file will be written back if enough
+seeding was obtained from these sources.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl base64
+Perform
+.Em base64
+encoding on the output.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm rand
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl hex
+Specify hexadecimal output.
+.It Fl out Ar file
+Write to
+.Ar file
+instead of standard output.
+.It Fl rand Ar
+Use specified file or files, or EGD socket (see
+.Xr RAND_egd 3 )
+for seeding the random number generator.
+Multiple files can be specified separated by a
+.Sq \&: .
+.El
+.\"
+.\" REQ
+.\"
+.Sh REQ
+.nr nS 1
+.Nm "openssl req"
+.Bk -words
+.Op Fl asn1-kludge
+.Op Fl batch
+.Op Fl config Ar file
+.Op Fl days Ar n
+.Op Fl engine Ar id
+.Op Fl extensions Ar section
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl key Ar keyfile
+.Op Fl keyform Ar DER | PEM
+.Op Fl keyout Ar file
+.Op Fl md4 | md5 | sha1
+.Op Fl modulus
+.Op Fl nameopt Ar option
+.Op Fl new
+.Op Fl newhdr
+.Op Fl newkey Ar arg
+.Op Fl no-asn1-kludge
+.Op Fl nodes
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl passin Ar arg
+.Op Fl passout Ar arg
+.Op Fl pubkey
+.Op Fl rand Ar
+.Op Fl reqexts Ar section
+.Op Fl reqopt Ar option
+.Op Fl set_serial Ar n
+.Op Fl subj Ar arg
+.Op Fl subject
+.Op Fl text
+.Op Fl utf8
+.Op Fl verbose
+.Op Fl verify
+.Op Fl x509
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm req
+command primarily creates and processes certificate requests
+in PKCS#10 format.
+It can additionally create self-signed certificates,
+for use as root CAs, for example.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl asn1-kludge
+By default, the
+.Nm req
+command outputs certificate requests containing
+no attributes in the correct PKCS#10 format.
+However certain CAs will only
+accept requests containing no attributes in an invalid form: this
+option produces this invalid format.
+.Pp
+More precisely, the
+.Em Attributes
+in a PKCS#10 certificate request are defined as a SET OF Attribute.
+They are
+.Em not
+optional, so if no attributes are present then they should be encoded as an
+empty SET OF.
+The invalid form does not include the empty
+SET OF, whereas the correct form does.
+.Pp
+It should be noted that very few CAs still require the use of this option.
+.It Fl batch
+Non-interactive mode.
+.It Fl config Ar file
+This allows an alternative configuration file to be specified;
+this overrides the compile time filename or any specified in
+the
+.Ev OPENSSL_CONF
+environment variable.
+.It Fl days Ar n
+When the
+.Fl x509
+option is being used, this specifies the number of
+days to certify the certificate for.
+The default is 30 days.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm req
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl extensions Ar section , Fl reqexts Ar section
+These options specify alternative sections to include certificate
+extensions (if the
+.Fl x509
+option is present) or certificate request extensions.
+This allows several different sections to
+be used in the same configuration file to specify requests for
+a variety of purposes.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read a request from, or standard input
+if this option is not specified.
+A request is only read if the creation options
+.Fl new
+and
+.Fl newkey
+are not specified.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+The
+.Ar DER
+argument uses an ASN1 DER-encoded form compatible with the PKCS#10.
+The
+.Ar PEM
+form is the default format:
+it consists of the DER format base64-encoded with additional header and
+footer lines.
+.It Fl key Ar keyfile
+This specifies the file to read the private key from.
+It also accepts PKCS#8 format private keys for PEM format files.
+.It Fl keyform Ar DER | PEM
+The format of the private key file specified in the
+.Fl key
+argument.
+.Ar PEM
+is the default.
+.It Fl keyout Ar file
+This gives the
+.Ar file
+to write the newly created private key to.
+If this option is not specified, the filename present in the
+configuration file is used.
+.It Fl md4 | md5 | sha1
+This specifies the message digest to sign the request with.
+This overrides the digest algorithm specified in the configuration file.
+.Pp
+Some public key algorithms may override this choice.
+For instance, DSA signatures always use SHA1.
+.It Fl modulus
+This option prints out the value of the modulus of the public key
+contained in the request.
+.It Fl nameopt Ar option , Fl reqopt Ar option
+These options determine how the subject or issuer names are displayed.
+The
+.Ar option
+argument can be a single option or multiple options separated by commas.
+Alternatively, these options may be used more than once to set multiple options.
+See the
+.Sx X509
+section below for details.
+.It Fl new
+This option generates a new certificate request.
+It will prompt the user for the relevant field values.
+The actual fields prompted for and their maximum and minimum sizes
+are specified in the configuration file and any requested extensions.
+.Pp
+If the
+.Fl key
+option is not used, it will generate a new RSA private
+key using information specified in the configuration file.
+.It Fl newhdr
+Adds the word NEW to the PEM file header and footer lines
+on the outputed request.
+Some software
+.Pq Netscape certificate server
+and some CAs need this.
+.It Fl newkey Ar arg
+This option creates a new certificate request and a new private key.
+The argument takes one of several forms.
+.Ar rsa : Ns Ar nbits ,
+where
+.Ar nbits
+is the number of bits, generates an RSA key
+.Ar nbits
+in size.
+If
+.Ar nbits
+is omitted, i.e.\&
+.Cm -newkey rsa
+specified,
+the default key size, specified in the configuration file, is used.
+.Pp
+All other algorithms support the
+.Ar alg : Ns Ar file
+form,
+where file may be an algorithm parameter file,
+created by the
+.Cm genpkey -genparam
+command or an X.509 certificate for a key with approriate algorithm.
+.Pp
+.Ar param : Ns Ar file
+generates a key using the parameter file or certificate
+.Ar file ;
+the algorithm is determined by the parameters.
+.Ar algname : Ns Ar file
+use algorithm
+.Ar algname
+and parameter file
+.Ar file :
+the two algorithms must match or an error occurs.
+.Ar algname
+just uses algorithm
+.Ar algname ,
+and parameters, if necessary,
+should be specified via the
+.Fl pkeyopt
+option.
+.Pp
+.Ar dsa : Ns Ar file
+generates a DSA key using the parameters in the file
+.Ar file .
+.It Fl no-asn1-kludge
+Reverses the effect of
+.Fl asn1-kludge .
+.It Fl nodes
+If this option is specified and a private key is created, it
+will not be encrypted.
+.It Fl noout
+This option prevents output of the encoded version of the request.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write to, or standard output by default.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl pubkey
+Outputs the public key.
+.It Fl rand Ar
+A file or files containing random data used to seed the random number generator,
+or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.It Fl reqopt Ar option
+Customise the output format used with
+.Fl text .
+The
+.Ar option
+argument can be a single option or multiple options separated by commas.
+.Pp
+See the discussion of the
+.Fl certopt
+option in the
+.Nm x509
+command.
+.It Fl set_serial Ar n
+Serial number to use when outputting a self-signed certificate.
+This may be specified as a decimal value or a hex value if preceded by
+.Sq 0x .
+It is possible to use negative serial numbers but this is not recommended.
+.It Fl subj Ar arg
+Replaces subject field of input request with specified data and outputs
+modified request.
+The arg must be formatted as
+.Em /type0=value0/type1=value1/type2=... ;
+characters may be escaped by
+.Sq \e
+.Pq backslash ;
+no spaces are skipped.
+.It Fl subject
+Prints out the request subject (or certificate subject if
+.Fl x509
+is specified.
+.It Fl text
+Prints out the certificate request in text form.
+.It Fl utf8
+This option causes field values to be interpreted as UTF8 strings;
+by default they are interpreted as ASCII.
+This means that the field values, whether prompted from a terminal or
+obtained from a configuration file, must be valid UTF8 strings.
+.It Fl verbose
+Print extra details about the operations being performed.
+.It Fl verify
+Verifies the signature on the request.
+.It Fl x509
+This option outputs a self-signed certificate instead of a certificate
+request.
+This is typically used to generate a test certificate or
+a self-signed root CA.
+The extensions added to the certificate
+.Pq if any
+are specified in the configuration file.
+Unless specified using the
+.Fl set_serial
+option, 0 will be used for the serial number.
+.El
+.Sh REQ CONFIGURATION FILE FORMAT
+The configuration options are specified in the
+.Em req
+section of the configuration file.
+As with all configuration files, if no value is specified in the specific
+section (i.e.\&
+.Em req )
+then the initial unnamed or
+.Em default
+section is searched too.
+.Pp
+The options available are described in detail below.
+.Bl -tag -width "XXXX"
+.It Ar attributes
+This specifies the section containing any request attributes: its format
+is the same as
+.Ar distinguished_name .
+Typically these may contain the
+.Em challengePassword
+or
+.Em unstructuredName
+types.
+They are currently ignored by
+.Nm OpenSSL Ns Li 's
+request signing utilities, but some CAs might want them.
+.It Ar default_bits
+This specifies the default key size in bits.
+If not specified, 512 is used.
+It is used if the
+.Fl new
+option is used.
+It can be overridden by using the
+.Fl newkey
+option.
+.It Ar default_keyfile
+This is the default file to write a private key to.
+If not specified, the key is written to standard output.
+This can be overridden by the
+.Fl keyout
+option.
+.It Ar default_md
+This option specifies the digest algorithm to use.
+Possible values include
+.Ar md5
+and
+.Ar sha1 .
+If not present, MD5 is used.
+This option can be overridden on the command line.
+.It Ar distinguished_name
+This specifies the section containing the distinguished name fields to
+prompt for when generating a certificate or certificate request.
+The format is described in the next section.
+.It Ar encrypt_key
+If this is set to
+.Em no
+and a private key is generated, it is
+.Em not
+encrypted.
+This is equivalent to the
+.Fl nodes
+command line option.
+For compatibility,
+.Ar encrypt_rsa_key
+is an equivalent option.
+.It Ar input_password | output_password
+The passwords for the input private key file
+.Pq if present
+and the output private key file
+.Pq if one will be created .
+The command line options
+.Fl passin
+and
+.Fl passout
+override the configuration file values.
+.It Ar oid_file
+This specifies a file containing additional OBJECT IDENTIFIERS.
+Each line of the file should consist of the numerical form of the
+object identifier, followed by whitespace, then the short name followed
+by whitespace and finally the long name.
+.It Ar oid_section
+This specifies a section in the configuration file containing extra
+object identifiers.
+Each line should consist of the short name of the
+object identifier followed by
+.Sq =
+and the numerical form.
+The short and long names are the same when this option is used.
+.It Ar prompt
+If set to the value
+.Em no ,
+this disables prompting of certificate fields
+and just takes values from the config file directly.
+It also changes the expected format of the
+.Em distinguished_name
+and
+.Em attributes
+sections.
+.It Ar RANDFILE
+This specifies a file in which random number seed information is
+placed and read from, or an EGD socket (see
+.Xr RAND_egd 3 ) .
+It is used for private key generation.
+.It Ar req_extensions
+This specifies the configuration file section containing a list of
+extensions to add to the certificate request.
+It can be overridden by the
+.Fl reqexts
+command line switch.
+.It Ar string_mask
+This option masks out the use of certain string types in certain
+fields.
+Most users will not need to change this option.
+.Pp
+It can be set to several values:
+.Ar default ,
+which is also the default option, uses
+.Em PrintableStrings , T61Strings
+and
+.Em BMPStrings ;
+if the
+.Ar pkix
+value is used, then only
+.Em PrintableStrings
+and
+.Em BMPStrings
+will be used.
+This follows the PKIX recommendation in RFC 2459.
+If the
+.Fl utf8only
+option is used, then only
+.Em UTF8Strings
+will be used: this is the PKIX recommendation in RFC 2459 after 2003.
+Finally, the
+.Ar nombstr
+option just uses
+.Em PrintableStrings
+and
+.Em T61Strings :
+certain software has problems with
+.Em BMPStrings
+and
+.Em UTF8Strings :
+in particular Netscape.
+.It Ar utf8
+If set to the value
+.Em yes ,
+then field values are interpreted as UTF8 strings;
+by default they are interpreted as ASCII.
+This means that the field values, whether prompted from a terminal or
+obtained from a configuration file, must be valid UTF8 strings.
+.It Ar x509_extensions
+This specifies the configuration file section containing a list of
+extensions to add to a certificate generated when the
+.Fl x509
+switch is used.
+It can be overridden by the
+.Fl extensions
+command line switch.
+.El
+.Sh REQ DISTINGUISHED NAME AND ATTRIBUTE SECTION FORMAT
+There are two separate formats for the distinguished name and attribute
+sections.
+If the
+.Fl prompt
+option is set to
+.Em no ,
+then these sections just consist of field names and values: for example,
+.Bd -unfilled -offset indent
+CN=My Name
+OU=My Organization
+emailAddress=someone@somewhere.org
+.Ed
+.Pp
+This allows external programs
+.Pq e.g. GUI based
+to generate a template file with all the field names and values
+and just pass it to
+.Nm req .
+An example of this kind of configuration file is contained in the
+.Sx REQ EXAMPLES
+section.
+.Pp
+Alternatively if the
+.Fl prompt
+option is absent or not set to
+.Em no ,
+then the file contains field prompting information.
+It consists of lines of the form:
+.Bd -unfilled -offset indent
+fieldName="prompt"
+fieldName_default="default field value"
+fieldName_min= 2
+fieldName_max= 4
+.Ed
+.Pp
+.Qq fieldName
+is the field name being used, for example
+.Em commonName
+.Pq or CN .
+The
+.Qq prompt
+string is used to ask the user to enter the relevant details.
+If the user enters nothing, the default value is used;
+if no default value is present, the field is omitted.
+A field can still be omitted if a default value is present,
+if the user just enters the
+.Sq \&.
+character.
+.Pp
+The number of characters entered must be between the
+.Em fieldName_min
+and
+.Em fieldName_max
+limits:
+there may be additional restrictions based on the field being used
+(for example
+.Em countryName
+can only ever be two characters long and must fit in a
+.Em PrintableString ) .
+.Pp
+Some fields (such as
+.Em organizationName )
+can be used more than once in a DN.
+This presents a problem because configuration files will
+not recognize the same name occurring twice.
+To avoid this problem, if the
+.Em fieldName
+contains some characters followed by a full stop, they will be ignored.
+So, for example, a second
+.Em organizationName
+can be input by calling it
+.Qq 1.organizationName .
+.Pp
+The actual permitted field names are any object identifier short or
+long names.
+These are compiled into
+.Nm OpenSSL
+and include the usual values such as
+.Em commonName , countryName , localityName , organizationName ,
+.Em organizationUnitName , stateOrProvinceName .
+Additionally,
+.Em emailAddress
+is included as well as
+.Em name , surname , givenName initials
+and
+.Em dnQualifier .
+.Pp
+Additional object identifiers can be defined with the
+.Ar oid_file
+or
+.Ar oid_section
+options in the configuration file.
+Any additional fields will be treated as though they were a
+.Em DirectoryString .
+.Sh REQ EXAMPLES
+Examine and verify a certificate request:
+.Pp
+.Dl $ openssl req -in req.pem -text -verify -noout
+.Pp
+Create a private key and then generate a certificate request from it:
+.Bd -literal -offset indent
+$ openssl genrsa -out key.pem 2048
+$ openssl req -new -key key.pem -out req.pem
+.Ed
+.Pp
+The same but just using req:
+.Pp
+.Dl $ openssl req -newkey rsa:2048 -keyout key.pem -out req.pem
+.Pp
+Generate a self-signed root certificate:
+.Pp
+.Dl "$ openssl req -x509 -newkey rsa:2048 -keyout key.pem -out req.pem"
+.Pp
+Example of a file pointed to by the
+.Ar oid_file
+option:
+.Bd -unfilled -offset indent
+1.2.3.4        shortName       A longer Name
+1.2.3.6        otherName       Other longer Name
+.Ed
+.Pp
+Example of a section pointed to by
+.Ar oid_section
+making use of variable expansion:
+.Bd -unfilled -offset indent
+testoid1=1.2.3.5
+testoid2=${testoid1}.6
+.Ed
+.Pp
+Sample configuration file prompting for field values:
+.Bd -literal
+\& [ req ]
+\& default_bits           = 1024
+\& default_keyfile        = privkey.pem
+\& distinguished_name     = req_distinguished_name
+\& attributes             = req_attributes
+\& x509_extensions        = v3_ca
+
+\& dirstring_type = nobmp
+
+\& [ req_distinguished_name ]
+\& countryName                    = Country Name (2 letter code)
+\& countryName_default            = AU
+\& countryName_min                = 2
+\& countryName_max                = 2
+
+\& localityName                   = Locality Name (eg, city)
+
+\& organizationalUnitName         = Organizational Unit Name (eg, section)
+
+\& commonName                     = Common Name (eg, YOUR name)
+\& commonName_max                 = 64
+
+\& emailAddress                   = Email Address
+\& emailAddress_max               = 40
+
+\& [ req_attributes ]
+\& challengePassword              = A challenge password
+\& challengePassword_min          = 4
+\& challengePassword_max          = 20
+
+\& [ v3_ca ]
+
+\& subjectKeyIdentifier=hash
+\& authorityKeyIdentifier=keyid:always,issuer:always
+\& basicConstraints = CA:true
+.Ed
+.Pp
+Sample configuration containing all field values:
+.Bd -literal
+\& RANDFILE               = $ENV::HOME/.rnd
+
+\& [ req ]
+\& default_bits           = 1024
+\& default_keyfile        = keyfile.pem
+\& distinguished_name     = req_distinguished_name
+\& attributes             = req_attributes
+\& prompt                 = no
+\& output_password        = mypass
+
+\& [ req_distinguished_name ]
+\& C                      = GB
+\& ST                     = Test State or Province
+\& L                      = Test Locality
+\& O                      = Organization Name
+\& OU                     = Organizational Unit Name
+\& CN                     = Common Name
+\& emailAddress           = test@email.address
+
+\& [ req_attributes ]
+\& challengePassword              = A challenge password
+.Ed
+.Sh REQ NOTES
+The header and footer lines in the PEM format are normally:
+.Bd -unfilled -offset indent
+-----BEGIN CERTIFICATE REQUEST-----
+-----END CERTIFICATE REQUEST-----
+.Ed
+.Pp
+Some software
+.Pq some versions of Netscape certificate server
+instead needs:
+.Bd -unfilled -offset indent
+-----BEGIN NEW CERTIFICATE REQUEST-----
+-----END NEW CERTIFICATE REQUEST-----
+.Ed
+.Pp
+which is produced with the
+.Fl newhdr
+option but is otherwise compatible.
+Either form is accepted transparently on input.
+.Pp
+The certificate requests generated by Xenroll with MSIE have extensions added.
+It includes the
+.Em keyUsage
+extension which determines the type of key
+.Pq signature only or general purpose
+and any additional OIDs entered by the script in an
+.Em extendedKeyUsage
+extension.
+.Sh REQ DIAGNOSTICS
+The following messages are frequently asked about:
+.Bd -unfilled -offset indent
+Using configuration from /some/path/openssl.cnf
+Unable to load config info
+.Ed
+.Pp
+This is followed some time later by...
+.Bd -unfilled -offset indent
+unable to find 'distinguished_name' in config
+problems making Certificate Request
+.Ed
+.Pp
+The first error message is the clue: it can't find the configuration
+file!
+Certain operations
+.Pq like examining a certificate request
+don't need a configuration file so its use isn't enforced.
+Generation of certificates or requests, however, do need a configuration file.
+This could be regarded as a bug.
+.Pp
+Another puzzling message is this:
+.Bd -unfilled -offset indent
+Attributes:
+    a0:00
+.Ed
+.Pp
+This is displayed when no attributes are present and the request includes
+the correct empty SET OF structure
+.Pq the DER encoding of which is 0xa0 0x00 .
+If you just see:
+.Pp
+.D1 Attributes:
+.Pp
+then the SET OF is missing and the encoding is technically invalid
+.Pq but it is tolerated .
+See the description of the command line option
+.Fl asn1-kludge
+for more information.
+.Sh REQ ENVIRONMENT VARIABLES
+The variable
+.Ev OPENSSL_CONF ,
+if defined, allows an alternative configuration
+file location to be specified; it will be overridden by the
+.Fl config
+command line switch if it is present.
+For compatibility reasons the
+.Ev SSLEAY_CONF
+environment variable serves the same purpose but its use is discouraged.
+.Sh REQ BUGS
+.Nm OpenSSL Ns Li 's
+handling of T61Strings
+.Pq aka TeletexStrings
+is broken: it effectively treats them as ISO 8859-1
+.Pq Latin 1 ;
+Netscape and MSIE have similar behaviour.
+This can cause problems if you need characters that aren't available in
+.Em PrintableStrings
+and you don't want to or can't use
+.Em BMPStrings .
+.Pp
+As a consequence of the T61String handling, the only correct way to represent
+accented characters in
+.Nm OpenSSL
+is to use a
+.Em BMPString :
+unfortunately Netscape currently chokes on these.
+If you have to use accented characters with Netscape
+and MSIE then you currently need to use the invalid T61String form.
+.Pp
+The current prompting is not very friendly.
+It doesn't allow you to confirm what you've just entered.
+Other things, like extensions in certificate requests, are
+statically defined in the configuration file.
+Some of these, like an email address in
+.Em subjectAltName ,
+should be input by the user.
+.\"
+.\" RSA
+.\"
+.Sh RSA
+.nr nS 1
+.Nm "openssl rsa"
+.Bk -words
+.Oo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Oc
+.Op Fl check
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl inform Ar DER | NET | PEM
+.Op Fl modulus
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | NET | PEM
+.Op Fl passin Ar arg
+.Op Fl passout Ar arg
+.Op Fl pubin
+.Op Fl pubout
+.Op Fl sgckey
+.Op Fl text
+.nr nS 0
+.Ek
+.Pp
+The
+.Nm rsa
+command processes RSA keys.
+They can be converted between various forms and their components printed out.
+.Pp
+.Sy Note :
+this command uses the traditional
+.Nm SSLeay
+compatible format for private key encryption:
+newer applications should use the more secure PKCS#8 format using the
+.Nm pkcs8
+utility.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Xo
+.Fl aes128 | aes192 | aes256 |
+.Fl des | des3
+.Xc
+These options encrypt the private key with the AES, DES,
+or the triple DES ciphers, respectively, before outputting it.
+A pass phrase is prompted for.
+If none of these options are specified, the key is written in plain text.
+This means that using the
+.Nm rsa
+utility to read in an encrypted key with no encryption option can be used
+to remove the pass phrase from a key, or by setting the encryption options
+it can be used to add or change the pass phrase.
+These options can only be used with PEM format output files.
+.It Fl check
+This option checks the consistency of an RSA private key.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm rsa
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read a key from, or standard input if this
+option is not specified.
+If the key is encrypted, a pass phrase will be prompted for.
+.It Fl inform Ar DER | NET | PEM
+This specifies the input format.
+The
+.Ar DER
+argument
+uses an ASN1 DER-encoded form compatible with the PKCS#1
+RSAPrivateKey or SubjectPublicKeyInfo format.
+The
+.Ar PEM
+form is the default format: it consists of the DER format base64-encoded with
+additional header and footer lines.
+On input PKCS#8 format private keys are also accepted.
+The
+.Ar NET
+form is a format described in the
+.Sx RSA NOTES
+section.
+.It Fl noout
+This option prevents output of the encoded version of the key.
+.It Fl modulus
+This option prints out the value of the modulus of the key.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write a key to, or standard output if this option is not specified.
+If any encryption options are set, a pass phrase will be prompted for.
+The output filename should
+.Em not
+be the same as the input filename.
+.It Fl outform Ar DER | NET | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl passout Ar arg
+The output file password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl pubin
+By default, a private key is read from the input file; with this
+option a public key is read instead.
+.It Fl pubout
+By default, a private key is output;
+with this option a public key will be output instead.
+This option is automatically set if the input is a public key.
+.It Fl sgckey
+Use the modified
+.Em NET
+algorithm used with some versions of Microsoft IIS and SGC keys.
+.It Fl text
+Prints out the various public or private key components in
+plain text, in addition to the encoded version.
+.El
+.Sh RSA NOTES
+The PEM private key format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN RSA PRIVATE KEY-----
+-----END RSA PRIVATE KEY-----
+.Ed
+.Pp
+The PEM public key format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN PUBLIC KEY-----
+-----END PUBLIC KEY-----
+.Ed
+.Pp
+The
+.Em NET
+form is a format compatible with older Netscape servers
+and Microsoft IIS .key files; this uses unsalted RC4 for its encryption.
+It is not very secure and so should only be used when necessary.
+.Pp
+Some newer version of IIS have additional data in the exported .key files.
+To use these with the
+.Nm rsa
+utility, view the file with a binary editor
+and look for the string
+.Qq private-key ,
+then trace back to the byte sequence 0x30, 0x82
+.Pq this is an ASN1 SEQUENCE .
+Copy all the data from this point onwards to another file and use that as
+the input to the
+.Nm rsa
+utility with the
+.Fl inform Ar NET
+option.
+If there is an error after entering the password, try the
+.Fl sgckey
+option.
+.Sh RSA EXAMPLES
+To remove the pass phrase on an RSA private key:
+.Pp
+.Dl $ openssl rsa -in key.pem -out keyout.pem
+.Pp
+To encrypt a private key using triple DES:
+.Pp
+.Dl $ openssl rsa -in key.pem -des3 -out keyout.pem
+.Pp
+To convert a private key from PEM to DER format:
+.Pp
+.Dl $ openssl rsa -in key.pem -outform DER -out keyout.der
+.Pp
+To print out the components of a private key to standard output:
+.Pp
+.Dl $ openssl rsa -in key.pem -text -noout
+.Pp
+To just output the public part of a private key:
+.Pp
+.Dl $ openssl rsa -in key.pem -pubout -out pubkey.pem
+.Sh RSA BUGS
+The command line password arguments don't currently work with
+.Em NET
+format.
+.Pp
+There should be an option that automatically handles .key files,
+without having to manually edit them.
+.\"
+.\" RSAUTL
+.\"
+.Sh RSAUTL
+.nr nS 1
+.Nm "openssl rsautl"
+.Bk -words
+.Op Fl asn1parse
+.Op Fl certin
+.Op Fl decrypt
+.Op Fl encrypt
+.Op Fl engine Ar id
+.Op Fl hexdump
+.Op Fl in Ar file
+.Op Fl inkey Ar file
+.Op Fl keyform Ar DER | PEM
+.Op Fl oaep | pkcs | raw | ssl
+.Op Fl out Ar file
+.Op Fl pubin
+.Op Fl sign
+.Op Fl verify
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm rsautl
+command can be used to sign, verify, encrypt and decrypt
+data using the RSA algorithm.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl asn1parse
+Asn1parse the output data; this is useful when combined with the
+.Fl verify
+option.
+.It Fl certin
+The input is a certificate containing an RSA public key.
+.It Fl decrypt
+Decrypt the input data using an RSA private key.
+.It Fl encrypt
+Encrypt the input data using an RSA public key.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm rsautl
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl hexdump
+Hex dump the output data.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read data from, or standard input
+if this option is not specified.
+.It Fl inkey Ar file
+The input key file, by default it should be an RSA private key.
+.It Fl keyform Ar DER | PEM
+Private ket format.
+Default is
+.Ar PEM .
+.It Fl oaep | pkcs | raw | ssl
+The padding to use:
+PKCS#1 OAEP, PKCS#1 v1.5
+.Pq the default ,
+or no padding, respectively.
+For signatures, only
+.Fl pkcs
+and
+.Fl raw
+can be used.
+.It Fl out Ar file
+Specifies the output
+.Ar file
+to write to, or standard output by
+default.
+.It Fl pubin
+The input file is an RSA public key.
+.It Fl sign
+Sign the input data and output the signed result.
+This requires an RSA private key.
+.It Fl verify
+Verify the input data and output the recovered data.
+.El
+.Sh RSAUTL NOTES
+.Nm rsautl ,
+because it uses the RSA algorithm directly, can only be
+used to sign or verify small pieces of data.
+.Sh RSAUTL EXAMPLES
+Sign some data using a private key:
+.Pp
+.Dl "$ openssl rsautl -sign -in file -inkey key.pem -out sig"
+.Pp
+Recover the signed data:
+.Pp
+.Dl $ openssl rsautl -verify -in sig -inkey key.pem
+.Pp
+Examine the raw signed data:
+.Pp
+.Li "\ \&$ openssl rsautl -verify -in file -inkey key.pem -raw -hexdump"
+.Bd -unfilled
+\& 0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
+\& 0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
+\& 0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
+\& 0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
+\& 0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
+\& 0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
+\& 0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
+\& 0070 - ff ff ff ff 00 68 65 6c-6c 6f 20 77 6f 72 6c 64   .....hello world
+.Ed
+.Pp
+The PKCS#1 block formatting is evident from this.
+If this was done using encrypt and decrypt, the block would have been of type 2
+.Pq the second byte
+and random padding data visible instead of the 0xff bytes.
+.Pp
+It is possible to analyse the signature of certificates using this
+utility in conjunction with
+.Nm asn1parse .
+Consider the self-signed example in
+.Pa certs/pca-cert.pem :
+running
+.Nm asn1parse
+as follows yields:
+.Pp
+.Li "\ \&$ openssl asn1parse -in pca-cert.pem"
+.Bd -unfilled
+\&    0:d=0  hl=4 l= 742 cons: SEQUENCE
+\&    4:d=1  hl=4 l= 591 cons:  SEQUENCE
+\&    8:d=2  hl=2 l=   3 cons:   cont [ 0 ]
+\&   10:d=3  hl=2 l=   1 prim:    INTEGER           :02
+\&   13:d=2  hl=2 l=   1 prim:   INTEGER           :00
+\&   16:d=2  hl=2 l=  13 cons:   SEQUENCE
+\&   18:d=3  hl=2 l=   9 prim:    OBJECT            :md5WithRSAEncryption
+\&   29:d=3  hl=2 l=   0 prim:    NULL
+\&   31:d=2  hl=2 l=  92 cons:   SEQUENCE
+\&   33:d=3  hl=2 l=  11 cons:    SET
+\&   35:d=4  hl=2 l=   9 cons:     SEQUENCE
+\&   37:d=5  hl=2 l=   3 prim:      OBJECT            :countryName
+\&   42:d=5  hl=2 l=   2 prim:      PRINTABLESTRING   :AU
+\&  ....
+\&  599:d=1  hl=2 l=  13 cons:  SEQUENCE
+\&  601:d=2  hl=2 l=   9 prim:   OBJECT            :md5WithRSAEncryption
+\&  612:d=2  hl=2 l=   0 prim:   NULL
+\&  614:d=1  hl=3 l= 129 prim:  BIT STRING
+.Ed
+.Pp
+The final BIT STRING contains the actual signature.
+It can be extracted with:
+.Pp
+.Dl "$ openssl asn1parse -in pca-cert.pem -out sig -noout -strparse 614"
+.Pp
+The certificate public key can be extracted with:
+.Pp
+.Dl $ openssl x509 -in test/testx509.pem -pubkey -noout \*(Gtpubkey.pem
+.Pp
+The signature can be analysed with:
+.Pp
+.Li "\ \&$ openssl rsautl -in sig -verify -asn1parse -inkey pubkey.pem -pubin"
+.Bd -unfilled
+\&    0:d=0  hl=2 l=  32 cons: SEQUENCE
+\&    2:d=1  hl=2 l=  12 cons:  SEQUENCE
+\&    4:d=2  hl=2 l=   8 prim:   OBJECT            :md5
+\&   14:d=2  hl=2 l=   0 prim:   NULL
+\&   16:d=1  hl=2 l=  16 prim:  OCTET STRING
+\&   0000 - f3 46 9e aa 1a 4a 73 c9-37 ea 93 00 48 25 08 b5  .F...Js.7...H%..
+.Ed
+.Pp
+This is the parsed version of an ASN1
+.Em DigestInfo
+structure.
+It can be seen that the digest used was MD5.
+The actual part of the certificate that was signed can be extracted with:
+.Pp
+.Dl "$ openssl asn1parse -in pca-cert.pem -out tbs -noout -strparse 4"
+.Pp
+and its digest computed with:
+.Pp
+.Dl $ openssl md5 -c tbs
+.D1 MD5(tbs)= f3:46:9e:aa:1a:4a:73:c9:37:ea:93:00:48:25:08:b5
+.Pp
+which it can be seen agrees with the recovered value above.
+.\"
+.\" S_CLIENT
+.\"
+.Sh S_CLIENT
+.nr nS 1
+.Nm "openssl s_client"
+.Bk -words
+.Op Fl 4 | 6
+.Op Fl bugs
+.Op Fl CAfile Ar file
+.Op Fl CApath Ar directory
+.Op Fl cert Ar file
+.Op Fl check_ss_sig
+.Op Fl cipher Ar cipherlist
+.Oo
+.Fl connect Ar host : Ns Ar port |
+.Ar host Ns / Ns Ar port
+.Oc
+.Op Fl crl_check
+.Op Fl crl_check_all
+.Op Fl crlf
+.Op Fl debug
+.Op Fl engine Ar id
+.Op Fl extended_crl
+.Op Fl ign_eof
+.Op Fl ignore_critical
+.Op Fl issuer_checks
+.Op Fl key Ar keyfile
+.Op Fl msg
+.Op Fl nbio
+.Op Fl nbio_test
+.Op Fl no_ssl3
+.Op Fl no_ticket
+.Op Fl no_tls1
+.Op Fl pause
+.Op Fl policy_check
+.Op Fl prexit
+.Op Fl psk Ar key
+.Op Fl psk_identity Ar identity
+.Op Fl quiet
+.Op Fl rand Ar
+.Op Fl reconnect
+.Op Fl showcerts
+.Op Fl ssl3
+.Op Fl starttls Ar protocol
+.Op Fl state
+.Op Fl tls1
+.Op Fl tlsextdebug
+.Op Fl verify Ar depth
+.Op Fl x509_strict
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm s_client
+command implements a generic SSL/TLS client which connects
+to a remote host using SSL/TLS.
+It is a
+.Em very
+useful diagnostic tool for SSL servers.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl 4
+Specify that
+.Nm s_client
+should attempt connections using IPv4 only.
+.It Fl 6
+Specify that
+.Nm s_client
+should attempt connections using IPv6 only.
+.It Fl bugs
+There are several known bugs in SSL and TLS implementations.
+Adding this option enables various workarounds.
+.It Fl CAfile Ar file
+A
+.Ar file
+containing trusted certificates to use during server authentication
+and to use when attempting to build the client certificate chain.
+.It Fl CApath Ar directory
+The
+.Ar directory
+to use for server certificate verification.
+This directory must be in
+.Qq hash format ;
+see
+.Fl verify
+for more information.
+These are also used when building the client certificate chain.
+.It Fl cert Ar file
+The certificate to use, if one is requested by the server.
+The default is not to use a certificate.
+.It Xo
+.Fl check_ss_sig ,
+.Fl crl_check ,
+.Fl crl_check_all ,
+.Fl extended_crl ,
+.Fl ignore_critical ,
+.Fl issuer_checks ,
+.Fl policy_check ,
+.Fl x509_strict
+.Xc
+Set various certificate chain validation options.
+See the
+.Nm VERIFY
+command for details.
+.It Fl cipher Ar cipherlist
+This allows the cipher list sent by the client to be modified.
+Although the server determines which cipher suite is used, it should take
+the first supported cipher in the list sent by the client.
+See the
+.Sx CIPHERS
+section above for more information.
+.It Xo
+.Fl connect Ar host : Ns Ar port |
+.Ar host Ns / Ns Ar port
+.Xc
+This specifies the
+.Ar host
+and optional
+.Ar port
+to connect to.
+If not specified, an attempt is made to connect to the local host
+on port 4433.
+Alternatively, the host and port pair may be separated using a forward-slash
+character.
+This form is useful for numeric IPv6 addresses.
+.It Fl crlf
+This option translates a line feed from the terminal into CR+LF as required
+by some servers.
+.It Fl debug
+Print extensive debugging information including a hex dump of all traffic.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm s_client
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl ign_eof
+Inhibit shutting down the connection when end of file is reached in the
+input.
+.It Fl key Ar keyfile
+The private key to use.
+If not specified, the certificate file will be used.
+.It Fl msg
+Show all protocol messages with hex dump.
+.It Fl nbio
+Turns on non-blocking I/O.
+.It Fl nbio_test
+Tests non-blocking I/O.
+.It Xo
+.Fl no_ssl3 | no_tls1 |
+.Fl ssl3 | tls1
+.Xc
+These options disable the use of certain SSL or TLS protocols.
+By default, the initial handshake uses a method which should be compatible
+with all servers and permit them to use SSL v3 or TLS as appropriate.
+.Pp
+Unfortunately there are a lot of ancient and broken servers in use which
+cannot handle this technique and will fail to connect.
+Some servers only work if TLS is turned off with the
+.Fl no_tls
+option.
+.It Fl no_ticket
+Disable RFC 4507 session ticket support.
+.It Fl pause
+Pauses 1 second between each read and write call.
+.It Fl prexit
+Print session information when the program exits.
+This will always attempt
+to print out information even if the connection fails.
+Normally, information will only be printed out once if the connection succeeds.
+This option is useful because the cipher in use may be renegotiated
+or the connection may fail because a client certificate is required or is
+requested only after an attempt is made to access a certain URL.
+.Sy Note :
+the output produced by this option is not always accurate because a
+connection might never have been established.
+.It Fl psk Ar key
+Use the PSK key
+.Ar key
+when using a PSK cipher suite.
+The key is given as a hexadecimal number without the leading 0x,
+for example -psk 1a2b3c4d.
+.It Fl psk_identity Ar identity
+Use the PSK identity
+.Ar identity
+when using a PSK cipher suite.
+.It Fl quiet
+Inhibit printing of session and certificate information.
+This implicitly turns on
+.Fl ign_eof
+as well.
+.It Fl rand Ar
+A file or files containing random data used to seed the random number generator,
+or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.It Fl reconnect
+Reconnects to the same server 5 times using the same session ID; this can
+be used as a test that session caching is working.
+.It Fl showcerts
+Display the whole server certificate chain: normally only the server
+certificate itself is displayed.
+.It Fl starttls Ar protocol
+Send the protocol-specific message(s) to switch to TLS for communication.
+.Ar protocol
+is a keyword for the intended protocol.
+Currently, the supported keywords are
+.Qq ftp ,
+.Qq imap ,
+.Qq smtp ,
+.Qq pop3 ,
+and
+.Qq xmpp .
+.It Fl state
+Prints out the SSL session states.
+.It Fl tlsextdebug
+Print out a hex dump of any TLS extensions received from the server.
+.It Fl verify Ar depth
+The verify
+.Ar depth
+to use.
+This specifies the maximum length of the
+server certificate chain and turns on server certificate verification.
+Currently the verify operation continues after errors so all the problems
+with a certificate chain can be seen.
+As a side effect the connection will never fail due to a server
+certificate verify failure.
+.El
+.Sh S_CLIENT CONNECTED COMMANDS
+If a connection is established with an SSL server, any data received
+from the server is displayed and any key presses will be sent to the
+server.
+When used interactively (which means neither
+.Fl quiet
+nor
+.Fl ign_eof
+have been given), the session will be renegotiated if the line begins with an
+.Em R ;
+if the line begins with a
+.Em Q
+or if end of file is reached, the connection will be closed down.
+.Sh S_CLIENT NOTES
+.Nm s_client
+can be used to debug SSL servers.
+To connect to an SSL HTTP server the command:
+.Pp
+.Dl $ openssl s_client -connect servername:443
+.Pp
+would typically be used
+.Pq HTTPS uses port 443 .
+If the connection succeeds, an HTTP command can be given such as
+.Qq GET
+to retrieve a web page.
+.Pp
+If the handshake fails, there are several possible causes; if it is
+nothing obvious like no client certificate, then the
+.Fl bugs , ssl3 , tls1 , no_ssl3 ,
+and
+.Fl no_tls1
+options can be tried in case it is a buggy server.
+In particular these options should be tried
+.Em before
+submitting a bug report to an
+.Nm OpenSSL
+mailing list.
+.Pp
+A frequent problem when attempting to get client certificates working
+is that a web client complains it has no certificates or gives an empty
+list to choose from.
+This is normally because the server is not sending the client's certificate
+authority in its
+.Qq acceptable CA list
+when it requests a certificate.
+By using
+.Nm s_client
+the CA list can be viewed and checked.
+However some servers only request client authentication
+after a specific URL is requested.
+To obtain the list in this case it is necessary to use the
+.Fl prexit
+option and send an HTTP request for an appropriate page.
+.Pp
+If a certificate is specified on the command line using the
+.Fl cert
+option, it will not be used unless the server specifically requests
+a client certificate.
+Therefore merely including a client certificate
+on the command line is no guarantee that the certificate works.
+.Pp
+If there are problems verifying a server certificate, the
+.Fl showcerts
+option can be used to show the whole chain.
+.Pp
+Compression methods are only supported for
+.Fl tls1 .
+.Sh S_CLIENT BUGS
+Because this program has a lot of options and also because some of
+the techniques used are rather old, the C source of
+.Nm s_client
+is rather hard to read and not a model of how things should be done.
+A typical SSL client program would be much simpler.
+.Pp
+The
+.Fl verify
+option should really exit if the server verification fails.
+.Pp
+The
+.Fl prexit
+option is a bit of a hack.
+We should really report information whenever a session is renegotiated.
+.\"
+.\" S_SERVER
+.\"
+.Sh S_SERVER
+.nr nS 1
+.Nm "openssl s_server"
+.Bk -words
+.Op Fl accept Ar port
+.Op Fl bugs
+.Op Fl CAfile Ar file
+.Op Fl CApath Ar directory
+.Op Fl cert Ar file
+.Op Fl cipher Ar cipherlist
+.Op Fl context Ar id
+.Op Fl crl_check
+.Op Fl crl_check_all
+.Op Fl crlf
+.Op Fl dcert Ar file
+.Op Fl debug
+.Op Fl dhparam Ar file
+.Op Fl dkey Ar file
+.Op Fl engine Ar id
+.Op Fl hack
+.Op Fl HTTP
+.Op Fl id_prefix Ar arg
+.Op Fl key Ar keyfile
+.Op Fl msg
+.Op Fl nbio
+.Op Fl nbio_test
+.Op Fl no_dhe
+.Op Fl no_ssl3
+.Op Fl no_tls1
+.Op Fl no_tmp_rsa
+.Op Fl nocert
+.Op Fl psk Ar key
+.Op Fl psk_hint Ar hint
+.Op Fl quiet
+.Op Fl rand Ar
+.Op Fl serverpref
+.Op Fl ssl3
+.Op Fl state
+.Op Fl tls1
+.Op Fl Verify Ar depth
+.Op Fl verify Ar depth
+.Op Fl WWW
+.Op Fl www
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm s_server
+command implements a generic SSL/TLS server which listens
+for connections on a given port using SSL/TLS.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl accept Ar port
+The TCP
+.Ar port
+to listen on for connections.
+If not specified, 4433 is used.
+.It Fl bugs
+There are several known bugs in SSL and TLS implementations.
+Adding this option enables various workarounds.
+.It Fl CAfile Ar file
+A file containing trusted certificates to use during client authentication
+and to use when attempting to build the server certificate chain.
+The list is also used in the list of acceptable client CAs passed to the
+client when a certificate is requested.
+.It Fl CApath Ar directory
+The
+.Ar directory
+to use for client certificate verification.
+This directory must be in
+.Qq hash format ;
+see
+.Fl verify
+for more information.
+These are also used when building the server certificate chain.
+.It Fl cert Ar file
+The certificate to use; most server's cipher suites require the use of a
+certificate and some require a certificate with a certain public key type:
+for example the DSS cipher suites require a certificate containing a DSS
+.Pq DSA
+key.
+If not specified, the file
+.Pa server.pem
+will be used.
+.It Fl cipher Ar cipherlist
+This allows the cipher list used by the server to be modified.
+When the client sends a list of supported ciphers, the first client cipher
+also included in the server list is used.
+Because the client specifies the preference order, the order of the server
+cipherlist is irrelevant.
+See the
+.Sx CIPHERS
+section for more information.
+.It Fl context Ar id
+Sets the SSL context ID.
+It can be given any string value.
+If this option is not present, a default value will be used.
+.It Fl crl_check , crl_check_all
+Check the peer certificate has not been revoked by its CA.
+The CRLs are appended to the certificate file.
+With the
+.Fl crl_check_all
+option, all CRLs of all CAs in the chain are checked.
+.It Fl crlf
+This option translates a line feed from the terminal into CR+LF.
+.It Fl dcert Ar file , Fl dkey Ar file
+Specify an additional certificate and private key; these behave in the
+same manner as the
+.Fl cert
+and
+.Fl key
+options except there is no default if they are not specified
+.Pq no additional certificate or key is used .
+As noted above some cipher suites require a certificate containing a key of
+a certain type.
+Some cipher suites need a certificate carrying an RSA key
+and some a DSS
+.Pq DSA
+key.
+By using RSA and DSS certificates and keys,
+a server can support clients which only support RSA or DSS cipher suites
+by using an appropriate certificate.
+.It Fl debug
+Print extensive debugging information including a hex dump of all traffic.
+.It Fl dhparam Ar file
+The DH parameter file to use.
+The ephemeral DH cipher suites generate keys
+using a set of DH parameters.
+If not specified, an attempt is made to
+load the parameters from the server certificate file.
+If this fails, a static set of parameters hard coded into the
+.Nm s_server
+program will be used.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm s_server
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl hack
+This option enables a further workaround for some early Netscape
+SSL code
+.Pq \&? .
+.It Fl HTTP
+Emulates a simple web server.
+Pages will be resolved relative to the current directory;
+for example if the URL
+.Pa https://myhost/page.html
+is requested, the file
+.Pa ./page.html
+will be loaded.
+The files loaded are assumed to contain a complete and correct HTTP
+response (lines that are part of the HTTP response line and headers
+must end with CRLF).
+.It Fl id_prefix Ar arg
+Generate SSL/TLS session IDs prefixed by
+.Ar arg .
+This is mostly useful for testing any SSL/TLS code
+.Pq e.g. proxies
+that wish to deal with multiple servers, when each of which might be
+generating a unique range of session IDs
+.Pq e.g. with a certain prefix .
+.It Fl key Ar keyfile
+The private key to use.
+If not specified, the certificate file will be used.
+.It Fl msg
+Show all protocol messages with hex dump.
+.It Fl nbio
+Turns on non-blocking I/O.
+.It Fl nbio_test
+Tests non-blocking I/O.
+.It Fl no_dhe
+If this option is set, no DH parameters will be loaded, effectively
+disabling the ephemeral DH cipher suites.
+.It Xo
+.Fl no_ssl3 | no_tls1 |
+.Fl ssl3 | tls1
+.Xc
+These options disable the use of certain SSL or TLS protocols.
+By default, the initial handshake uses a method which should be compatible
+with all servers and permit them to use SSL v3 or TLS as appropriate.
+.It Fl no_tmp_rsa
+Certain export cipher suites sometimes use a temporary RSA key; this option
+disables temporary RSA key generation.
+.It Fl nocert
+If this option is set, no certificate is used.
+This restricts the cipher suites available to the anonymous ones
+.Pq currently just anonymous DH .
+.It Fl psk Ar key
+Use the PSK key
+.Ar key
+when using a PSK cipher suite.
+The key is given as a hexadecimal number without the leading 0x,
+for example -psk 1a2b3c4d.
+.It Fl psk_hint Ar hint
+Use the PSK identity hint
+.Ar hint
+when using a PSK cipher suite.
+.It Fl quiet
+Inhibit printing of session and certificate information.
+.It Fl rand Ar
+A file or files containing random data used to seed the random number generator,
+or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.It Fl serverpref
+Use server's cipher preferences.
+.It Fl state
+Prints out the SSL session states.
+.It Fl WWW
+Emulates a simple web server.
+Pages will be resolved relative to the current directory;
+for example if the URL
+.Pa https://myhost/page.html
+is requested, the file
+.Pa ./page.html
+will be loaded.
+.It Fl www
+Sends a status message back to the client when it connects.
+This includes lots of information about the ciphers used and various
+session parameters.
+The output is in HTML format so this option will normally be used with a
+web browser.
+.It Fl Verify Ar depth , Fl verify Ar depth
+The verify
+.Ar depth
+to use.
+This specifies the maximum length of the client certificate chain
+and makes the server request a certificate from the client.
+With the
+.Fl Verify
+option, the client must supply a certificate or an error occurs.
+With the
+.Fl verify
+option, a certificate is requested but the client does not have to send one.
+.El
+.Sh S_SERVER CONNECTED COMMANDS
+If a connection request is established with an SSL client and neither the
+.Fl www
+nor the
+.Fl WWW
+option has been used, then normally any data received
+from the client is displayed and any key presses will be sent to the client.
+.Pp
+Certain single letter commands are also recognized which perform special
+operations: these are listed below.
+.Bl -tag -width "XXXX"
+.It Ar P
+Send some plain text down the underlying TCP connection: this should
+cause the client to disconnect due to a protocol violation.
+.It Ar Q
+End the current SSL connection and exit.
+.It Ar q
+End the current SSL connection, but still accept new connections.
+.It Ar R
+Renegotiate the SSL session and request a client certificate.
+.It Ar r
+Renegotiate the SSL session.
+.It Ar S
+Print out some session cache status information.
+.El
+.Sh S_SERVER NOTES
+.Nm s_server
+can be used to debug SSL clients.
+To accept connections from a web browser the command:
+.Pp
+.Dl $ openssl s_server -accept 443 -www
+.Pp
+can be used, for example.
+.Pp
+Most web browsers
+.Pq in particular Netscape and MSIE
+only support RSA cipher suites, so they cannot connect to servers
+which don't use a certificate carrying an RSA key or a version of
+.Nm OpenSSL
+with RSA disabled.
+.Pp
+Although specifying an empty list of CAs when requesting a client certificate
+is strictly speaking a protocol violation, some SSL
+clients interpret this to mean any CA is acceptable.
+This is useful for debugging purposes.
+.Pp
+The session parameters can printed out using the
+.Nm sess_id
+program.
+.Sh S_SERVER BUGS
+Because this program has a lot of options and also because some of
+the techniques used are rather old, the C source of
+.Nm s_server
+is rather hard to read and not a model of how things should be done.
+A typical SSL server program would be much simpler.
+.Pp
+The output of common ciphers is wrong: it just gives the list of ciphers that
+.Nm OpenSSL
+recognizes and the client supports.
+.Pp
+There should be a way for the
+.Nm s_server
+program to print out details of any
+unknown cipher suites a client says it supports.
+.\"
+.\" S_TIME
+.\"
+.Sh S_TIME
+.nr nS 1
+.Nm "openssl s_time"
+.Bk -words
+.Op Fl bugs
+.Op Fl CAfile Ar file
+.Op Fl CApath Ar directory
+.Op Fl cert Ar file
+.Op Fl cipher Ar cipherlist
+.Op Fl connect Ar host : Ns Ar port
+.Op Fl key Ar keyfile
+.Op Fl nbio
+.Op Fl new
+.Op Fl reuse
+.Op Fl ssl3
+.Op Fl time Ar seconds
+.Op Fl verify Ar depth
+.Op Fl www Ar page
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm s_client
+command implements a generic SSL/TLS client which connects to a
+remote host using SSL/TLS.
+It can request a page from the server and includes
+the time to transfer the payload data in its timing measurements.
+It measures the number of connections within a given timeframe,
+the amount of data transferred
+.Pq if any ,
+and calculates the average time spent for one connection.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl bugs
+There are several known bugs in SSL and TLS implementations.
+Adding this option enables various workarounds.
+.It Fl CAfile Ar file
+A file containing trusted certificates to use during server authentication
+and to use when attempting to build the client certificate chain.
+.It Fl CApath Ar directory
+The directory to use for server certificate verification.
+This directory must be in
+.Qq hash format ;
+see
+.Nm verify
+for more information.
+These are also used when building the client certificate chain.
+.It Fl cert Ar file
+The certificate to use, if one is requested by the server.
+The default is not to use a certificate.
+The file is in PEM format.
+.It Fl cipher Ar cipherlist
+This allows the cipher list sent by the client to be modified.
+Although the server determines which cipher suite is used,
+it should take the first supported cipher in the list sent by the client.
+See the
+.Nm ciphers
+command for more information.
+.It Fl connect Ar host : Ns Ar port
+This specifies the host and optional port to connect to.
+.It Fl key Ar keyfile
+The private key to use.
+If not specified, the certificate file will be used.
+The file is in PEM format.
+.It Fl nbio
+Turns on non-blocking I/O.
+.It Fl new
+Performs the timing test using a new session ID for each connection.
+If neither
+.Fl new
+nor
+.Fl reuse
+are specified,
+they are both on by default and executed in sequence.
+.It Fl reuse
+Performs the timing test using the same session ID;
+this can be used as a test that session caching is working.
+If neither
+.Fl new
+nor
+.Fl reuse
+are specified,
+they are both on by default and executed in sequence.
+.It Fl ssl3
+This option disables the use of certain SSL or TLS protocols.
+By default, the initial handshake uses a method
+which should be compatible with all servers and permit them to use
+SSL v3 or TLS as appropriate.
+The timing program is not as rich in options to turn protocols on and off as
+the
+.Nm s_client
+program and may not connect to all servers.
+.Pp
+Unfortunately there are a lot of ancient and broken servers in use which
+cannot handle this technique and will fail to connect.
+Some servers only work if TLS is turned off with the
+.Fl ssl3
+option.
+.It Fl time Ar seconds
+Specifies how long
+.Pq in seconds
+.Nm s_time
+should establish connections and
+optionally transfer payload data from a server.
+The default is 30 seconds.
+Server and client performance and the link speed
+determine how many connections
+.Nm s_time
+can establish.
+.It Fl verify Ar depth
+The verify depth to use.
+This specifies the maximum length of the server certificate chain
+and turns on server certificate verification.
+Currently the verify operation continues after errors, so all the problems
+with a certificate chain can be seen.
+As a side effect,
+the connection will never fail due to a server certificate verify failure.
+.It Fl www Ar page
+This specifies the page to GET from the server.
+A value of
+.Sq /
+gets the index.htm[l] page.
+If this parameter is not specified,
+.Nm s_time
+will only perform the handshake to establish SSL connections
+but not transfer any payload data.
+.El
+.Sh S_TIME NOTES
+.Nm s_client
+can be used to measure the performance of an SSL connection.
+To connect to an SSL HTTP server and get the default page the command
+.Bd -literal -offset indent
+$ openssl s_time -connect servername:443 -www / -CApath yourdir \e
+        -CAfile yourfile.pem -cipher commoncipher [-ssl3]
+.Ed
+.Pp
+would typically be used
+.Pq HTTPS uses port 443 .
+.Dq commoncipher
+is a cipher to which both client and server can agree;
+see the
+.Nm ciphers
+command for details.
+.Pp
+If the handshake fails, there are several possible causes:
+if it is nothing obvious like no client certificate, the
+.Fl bugs
+and
+.Fl ssl3
+options can be tried in case it is a buggy server.
+In particular you should play with these options
+.Em before
+submitting a bug report to an OpenSSL mailing list.
+.Pp
+A frequent problem when attempting to get client certificates working
+is that a web client complains it has no certificates or gives an empty
+list to choose from.
+This is normally because the server is not sending
+the clients certificate authority in its
+.Qq acceptable CA list
+when it requests a certificate.
+By using
+.Nm s_client ,
+the CA list can be viewed and checked.
+However some servers only request client authentication
+after a specific URL is requested.
+To obtain the list in this case, it is necessary to use the
+.Fl prexit
+option of
+.Nm s_client
+and send an HTTP request for an appropriate page.
+.Pp
+If a certificate is specified on the command line using the
+.Fl cert
+option,
+it will not be used unless the server specifically requests
+a client certificate.
+Therefore merely including a client certificate
+on the command line is no guarantee that the certificate works.
+.Sh S_TIME BUGS
+Because this program does not have all the options of the
+.Nm s_client
+program to turn protocols on and off,
+you may not be able to measure the performance
+of all protocols with all servers.
+.Pp
+The
+.Fl verify
+option should really exit if the server verification fails.
+.\"
+.\" SESS_ID
+.\"
+.Sh SESS_ID
+.nr nS 1
+.Nm "openssl sess_id"
+.Bk -words
+.Op Fl cert
+.Op Fl context Ar ID
+.Op Fl in Ar file
+.Op Fl inform Ar DER | PEM
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm sess_id
+program processes the encoded version of the SSL session structure and
+optionally prints out SSL session details
+.Pq for example the SSL session master key
+in human readable format.
+Since this is a diagnostic tool that needs some knowledge of the SSL
+protocol to use properly, most users will not need to use it.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl cert
+If a certificate is present in the session,
+it will be output using this option;
+if the
+.Fl text
+option is also present, then it will be printed out in text form.
+.It Fl context Ar ID
+This option can set the session ID so the output session information uses the
+supplied
+.Ar ID .
+The
+.Ar ID
+can be any string of characters.
+This option won't normally be used.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read session information from, or standard input by default.
+.It Fl inform Ar DER | PEM
+This specifies the input format.
+The
+.Ar DER
+argument uses an ASN1 DER-encoded
+format containing session details.
+The precise format can vary from one version to the next.
+The
+.Ar PEM
+form is the default format: it consists of the DER
+format base64-encoded with additional header and footer lines.
+.It Fl noout
+This option prevents output of the encoded version of the session.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write session information to, or standard
+output if this option is not specified.
+.It Fl outform Ar DER | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl text
+Prints out the various public or private key components in
+plain text in addition to the encoded version.
+.El
+.Sh SESS_ID OUTPUT
+Typical output:
+.Bd -literal
+SSL-Session:
+    Protocol  : TLSv1
+    Cipher    : 0016
+    Session-ID: 871E62626C554CE95488823752CBD5F3673A3EF3DCE9C67BD916C809914B40ED
+    Session-ID-ctx: 01000000
+    Master-Key: A7CEFC571974BE02CAC305269DC59F76EA9F0B180CB6642697A68251F2D2BB57E51DBBB4C7885573192AE9AEE220FACD
+    Key-Arg   : None
+    Start Time: 948459261
+    Timeout   : 300 (sec)
+    Verify return code 0 (ok)
+.Ed
+.Pp
+These are described below in more detail.
+.Pp
+.Bl -tag -width "Verify return code " -compact
+.It Ar Protocol
+This is the protocol in use: TLSv1 or SSLv3.
+.It Ar Cipher
+The cipher used is the actual raw SSL or TLS cipher code;
+see the SSL or TLS specifications for more information.
+.It Ar Session-ID
+The SSL session ID in hex format.
+.It Ar Session-ID-ctx
+The session ID context in hex format.
+.It Ar Master-Key
+This is the SSL session master key.
+.It Ar Key-Arg
+The key argument; this is only used in SSL v2.
+.It Ar Start Time
+This is the session start time, represented as an integer in standard
+.Ux
+format.
+.It Ar Timeout
+The timeout in seconds.
+.It Ar Verify return code
+This is the return code when an SSL client certificate is verified.
+.El
+.Sh SESS_ID NOTES
+The PEM-encoded session format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN SSL SESSION PARAMETERS-----
+-----END SSL SESSION PARAMETERS-----
+.Ed
+.Pp
+Since the SSL session output contains the master key, it is possible to read
+the contents of an encrypted session using this information.
+Therefore appropriate security precautions
+should be taken if the information is being output by a
+.Qq real
+application.
+This is, however, strongly discouraged and should only be used for
+debugging purposes.
+.Sh SESS_ID BUGS
+The cipher and start time should be printed out in human readable form.
+.\"
+.\" SMIME
+.\"
+.Sh SMIME
+.nr nS 1
+.Nm "openssl smime"
+.Bk -words
+.Oo
+.Fl aes128 | aes192 | aes256 | des |
+.Fl des3 | rc2-40 | rc2-64 | rc2-128
+.Oc
+.Op Fl binary
+.Op Fl CAfile Ar file
+.Op Fl CApath Ar directory
+.Op Fl certfile Ar file
+.Op Fl check_ss_sig
+.Op Fl content Ar file
+.Op Fl crl_check
+.Op Fl crl_check_all
+.Op Fl decrypt
+.Op Fl encrypt
+.Op Fl engine Ar id
+.Op Fl extended_crl
+.Op Fl from Ar addr
+.Op Fl ignore_critical
+.Op Fl in Ar file
+.Op Fl indef
+.Op Fl inform Ar DER | PEM | SMIME
+.Op Fl inkey Ar file
+.Op Fl issuer_checks
+.Op Fl keyform Ar ENGINE | PEM
+.Op Fl md Ar digest
+.Op Fl noattr
+.Op Fl nocerts
+.Op Fl nochain
+.Op Fl nodetach
+.Op Fl noindef
+.Op Fl nointern
+.Op Fl nosigs
+.Op Fl noverify
+.Op Fl out Ar file
+.Op Fl outform Ar DER | PEM | SMIME
+.Op Fl passin Ar arg
+.Op Fl pk7out
+.Op Fl policy_check
+.Op Fl rand Ar
+.Op Fl recip Ar file
+.Op Fl resign
+.Op Fl sign
+.Op Fl signer Ar file
+.Op Fl stream
+.Op Fl subject Ar s
+.Op Fl text
+.Op Fl to Ar addr
+.Op Fl verify
+.Op Fl x509_strict
+.Op Ar cert.pem ...
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm smime
+command handles
+.Em S/MIME
+mail.
+It can encrypt, decrypt, sign, and verify
+.Em S/MIME
+messages.
+.Pp
+There are six operation options that set the type of operation to be performed.
+The meaning of the other options varies according to the operation type.
+.Pp
+The six operation options are as follows:
+.Bl -tag -width "XXXX"
+.It Fl decrypt
+Decrypt mail using the supplied certificate and private key.
+Expects an encrypted mail message in
+.Em MIME
+format for the input file.
+The decrypted mail is written to the output file.
+.It Fl encrypt
+Encrypt mail for the given recipient certificates.
+Input file is the message to be encrypted.
+The output file is the encrypted mail in
+.Em MIME
+format.
+.It Fl pk7out
+Takes an input message and writes out a PEM-encoded PKCS#7 structure.
+.It Fl resign
+Resign a message: take an existing message and one or more new signers.
+.It Fl sign
+Sign mail using the supplied certificate and private key.
+Input file is the message to be signed.
+The signed message in
+.Em MIME
+format is written to the output file.
+.It Fl verify
+Verify signed mail.
+Expects a signed mail message on input and outputs the signed data.
+Both clear text and opaque signing is supported.
+.El
+.Pp
+The reamaining options are as follows:
+.Bl -tag -width "XXXX"
+.It Xo
+.Fl aes128 | aes192 | aes256 | des |
+.Fl des3 | rc2-40 | rc2-64 | rc2-128
+.Xc
+The encryption algorithm to use.
+128-, 192-, or 256-bit AES,
+DES
+.Pq 56 bits ,
+triple DES
+.Pq 168 bits ,
+or 40-, 64-, or 128-bit RC2, respectively;
+if not specified, 40-bit RC2 is
+used.
+Only used with
+.Fl encrypt .
+.It Fl binary
+Normally, the input message is converted to
+.Qq canonical
+format which is effectively using CR and LF as end of line \-
+as required by the
+.Em S/MIME
+specification.
+When this option is present no translation occurs.
+This is useful when handling binary data which may not be in
+.Em MIME
+format.
+.It Fl CAfile Ar file
+A
+.Ar file
+containing trusted CA certificates; only used with
+.Fl verify .
+.It Fl CApath Ar directory
+A
+.Ar directory
+containing trusted CA certificates; only used with
+.Fl verify .
+This directory must be a standard certificate directory:
+that is, a hash of each subject name (using
+.Nm x509 -hash )
+should be linked to each certificate.
+.It Ar cert.pem ...
+One or more certificates of message recipients: used when encrypting
+a message.
+.It Fl certfile Ar file
+Allows additional certificates to be specified.
+When signing, these will be included with the message.
+When verifying, these will be searched for the signers' certificates.
+The certificates should be in PEM format.
+.It Xo
+.Fl check_ss_sig ,
+.Fl crl_check ,
+.Fl crl_check_all ,
+.Fl extended_crl ,
+.Fl ignore_critical ,
+.Fl issuer_checks ,
+.Fl policy_check ,
+.Fl x509_strict
+.Xc
+Set various certificate chain validation options.
+See the
+.Nm VERIFY
+command for details.
+.It Fl content Ar file
+This specifies a file containing the detached content.
+This is only useful with the
+.Fl verify
+command.
+This is only usable if the PKCS#7 structure is using the detached
+signature form where the content is not included.
+This option will override any content if the input format is
+.Em S/MIME
+and it uses the multipart/signed
+.Em MIME
+content type.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm smime
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Xo
+.Fl from Ar addr ,
+.Fl subject Ar s ,
+.Fl to Ar addr
+.Xc
+The relevant mail headers.
+These are included outside the signed
+portion of a message so they may be included manually.
+When signing, many
+.Em S/MIME
+mail clients check that the signer's certificate email
+address matches the From: address.
+.It Fl in Ar file
+The input message to be encrypted or signed or the
+.Em MIME
+message to
+be decrypted or verified.
+.It Fl indef
+Enable streaming I/O for encoding operations.
+This permits single pass processing of data without
+the need to hold the entire contents in memory,
+potentially supporting very large files.
+Streaming is automatically set for S/MIME signing with detached
+data if the output format is SMIME;
+it is currently off by default for all other operations.
+.It Fl inform Ar DER | PEM | SMIME
+This specifies the input format for the PKCS#7 structure.
+The default is
+.Em SMIME ,
+which reads an
+.Em S/MIME
+format message.
+.Ar PEM
+and
+.Ar DER
+format change this to expect PEM and DER format PKCS#7 structures
+instead.
+This currently only affects the input format of the PKCS#7
+structure; if no PKCS#7 structure is being input (for example with
+.Fl encrypt
+or
+.Fl sign ) ,
+this option has no effect.
+.It Fl inkey Ar file
+The private key to use when signing or decrypting.
+This must match the corresponding certificate.
+If this option is not specified, the private key must be included
+in the certificate file specified with
+the
+.Fl recip
+or
+.Fl signer
+file.
+When signing,
+this option can be used multiple times to specify successive keys.
+.It Fl keyform Ar ENGINE | PEM
+Input private key format.
+.It Fl md Ar digest
+The digest algorithm to use when signing or resigning.
+If not present then the default digest algorithm for the signing key is used
+(usually SHA1).
+.It Fl noattr
+Normally, when a message is signed a set of attributes are included which
+include the signing time and supported symmetric algorithms.
+With this option they are not included.
+.It Fl nocerts
+When signing a message, the signer's certificate is normally included;
+with this option it is excluded.
+This will reduce the size of the signed message but the verifier must
+have a copy of the signer's certificate available locally (passed using the
+.Fl certfile
+option, for example).
+.It Fl nochain
+Do not do chain verification of signers' certificates: that is,
+don't use the certificates in the signed message as untrusted CAs.
+.It Fl nodetach
+When signing a message use opaque signing: this form is more resistant
+to translation by mail relays but it cannot be read by mail agents that
+do not support
+.Em S/MIME .
+Without this option cleartext signing with the
+.Em MIME
+type multipart/signed is used.
+.It Fl noindef
+Disable streaming I/O where it would produce an encoding of indefinite length.
+This option currently has no effect.
+In future streaming will be enabled by default on all relevant operations
+and this option will disable it.
+.It Fl nointern
+When verifying a message, normally certificates
+.Pq if any
+included in the message are searched for the signing certificate.
+With this option, only the certificates specified in the
+.Fl certfile
+option are used.
+The supplied certificates can still be used as untrusted CAs however.
+.It Fl nosigs
+Don't try to verify the signatures on the message.
+.It Fl noverify
+Do not verify the signer's certificate of a signed message.
+.It Fl out Ar file
+The message text that has been decrypted or verified, or the output
+.Em MIME
+format message that has been signed or verified.
+.It Fl outform Ar DER | PEM | SMIME
+This specifies the output format for the PKCS#7 structure.
+The default is
+.Em SMIME ,
+which writes an
+.Em S/MIME
+format message.
+.Ar PEM
+and
+.Ar DER
+format change this to write PEM and DER format PKCS#7 structures
+instead.
+This currently only affects the output format of the PKCS#7
+structure; if no PKCS#7 structure is being output (for example with
+.Fl verify
+or
+.Fl decrypt )
+this option has no effect.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl rand Ar
+A file or files
+containing random data used to seed the random number generator,
+or an EGD socket (see
+.Xr RAND_egd 3 ) .
+Multiple files can be specified separated by a
+.Sq \&: .
+.It Fl recip Ar file
+The recipients certificate when decrypting a message.
+This certificate
+must match one of the recipients of the message or an error occurs.
+.It Fl signer Ar file
+A signing certificate when signing or resigning a message;
+this option can be used multiple times if more than one signer is required.
+If a message is being verified, the signer's certificates will be
+written to this file if the verification was successful.
+.It Fl stream
+The same as
+.Fl indef .
+.It Fl text
+This option adds plain text
+.Pq text/plain
+.Em MIME
+headers to the supplied message if encrypting or signing.
+If decrypting or verifying, it strips off text headers:
+if the decrypted or verified message is not of
+.Em MIME
+type text/plain then an error occurs.
+.El
+.Sh SMIME NOTES
+The
+.Em MIME
+message must be sent without any blank lines between the
+headers and the output.
+Some mail programs will automatically add a blank line.
+Piping the mail directly to sendmail is one way to
+achieve the correct format.
+.Pp
+The supplied message to be signed or encrypted must include the
+necessary
+.Em MIME
+headers or many
+.Em S/MIME
+clients won't display it properly
+.Pq if at all .
+You can use the
+.Fl text
+option to automatically add plain text headers.
+.Pp
+A
+.Qq signed and encrypted
+message is one where a signed message is then encrypted.
+This can be produced by encrypting an already signed message:
+see the
+.Sx SMIME EXAMPLES
+section.
+.Pp
+This version of the program only allows one signer per message, but it
+will verify multiple signers on received messages.
+Some
+.Em S/MIME
+clients choke if a message contains multiple signers.
+It is possible to sign messages
+.Qq in parallel
+by signing an already signed message.
+.Pp
+The options
+.Fl encrypt
+and
+.Fl decrypt
+reflect common usage in
+.Em S/MIME
+clients.
+Strictly speaking these process PKCS#7 enveloped data: PKCS#7
+encrypted data is used for other purposes.
+.Pp
+The
+.Fl resign
+option uses an existing message digest when adding a new signer.
+This means that attributes must be present in at least one existing
+signer using the same message digest or this operation will fail.
+.Pp
+The
+.Fl stream
+and
+.Fl indef
+options enable experimental streaming I/O support.
+As a result the encoding is BER using indefinite length constructed encoding
+and no longer DER.
+Streaming is supported for the
+.Fl encrypt
+and
+.Fl sign
+operations if the content is not detached.
+.Pp
+Streaming is always used for the
+.Fl sign
+operation with detached data
+but since the content is no longer part of the PKCS#7 structure
+the encoding remains DER.
+.Sh SMIME EXIT CODES
+.Bl -tag -width "XXXX"
+.It Ar 0
+The operation was completely successful.
+.It Ar 1
+An error occurred parsing the command options.
+.It Ar 2
+One of the input files could not be read.
+.It Ar 3
+An error occurred creating the PKCS#7 file or when reading the
+.Em MIME
+message.
+.It Ar 4
+An error occurred decrypting or verifying the message.
+.It Ar 5
+The message was verified correctly, but an error occurred writing out
+the signer's certificates.
+.El
+.Sh SMIME EXAMPLES
+Create a cleartext signed message:
+.Bd -literal -offset indent
+$ openssl smime -sign -in message.txt -text -out mail.msg \e
+        -signer mycert.pem
+.Ed
+.Pp
+Create an opaque signed message:
+.Bd -literal -offset indent
+$ openssl smime -sign -in message.txt -text -out mail.msg \e
+        -nodetach -signer mycert.pem
+.Ed
+.Pp
+Create a signed message, include some additional certificates and
+read the private key from another file:
+.Bd -literal -offset indent
+$ openssl smime -sign -in in.txt -text -out mail.msg \e
+        -signer mycert.pem -inkey mykey.pem -certfile mycerts.pem
+.Ed
+.Pp
+Create a signed message with two signers:
+.Bd -literal -offset indent
+openssl smime -sign -in message.txt -text -out mail.msg \e
+        -signer mycert.pem -signer othercert.pem
+.Ed
+.Pp
+Send a signed message under
+.Ux
+directly to
+.Xr sendmail 8 ,
+including headers:
+.Bd -literal -offset indent
+$ openssl smime -sign -in in.txt -text -signer mycert.pem \e
+        -from steve@openssl.org -to someone@somewhere \e
+        -subject "Signed message" | sendmail someone@somewhere
+.Ed
+.Pp
+Verify a message and extract the signer's certificate if successful:
+.Bd -literal -offset indent
+$ openssl smime -verify -in mail.msg -signer user.pem \e
+        -out signedtext.txt
+.Ed
+.Pp
+Send encrypted mail using triple DES:
+.Bd -literal -offset indent
+$ openssl smime -encrypt -in in.txt -from steve@openssl.org \e
+        -to someone@somewhere -subject "Encrypted message" \e
+        -des3 -out mail.msg user.pem
+.Ed
+.Pp
+Sign and encrypt mail:
+.Bd -literal -offset indent
+$ openssl smime -sign -in ml.txt -signer my.pem -text | \e
+        openssl smime -encrypt -out mail.msg \e
+        -from steve@openssl.org -to someone@somewhere \e
+        -subject "Signed and Encrypted message" -des3 user.pem
+.Ed
+.Pp
+.Sy Note :
+The encryption command does not include the
+.Fl text
+option because the message being encrypted already has
+.Em MIME
+headers.
+.Pp
+Decrypt mail:
+.Bd -literal -offset indent
+$ openssl smime -decrypt -in mail.msg -recip mycert.pem \e
+        -inkey key.pem"
+.Ed
+.Pp
+The output from Netscape form signing is a PKCS#7 structure with the
+detached signature format.
+You can use this program to verify the signature by line wrapping the
+base64-encoded structure and surrounding it with:
+.Bd -unfilled -offset indent
+-----BEGIN PKCS7-----
+-----END PKCS7-----
+.Ed
+.Pp
+and using the command:
+.Bd -literal -offset indent
+$ openssl smime -verify -inform PEM -in signature.pem \e
+        -content content.txt
+.Ed
+.Pp
+Alternatively, you can base64 decode the signature and use:
+.Bd -literal -offset indent
+$ openssl smime -verify -inform DER -in signature.der \e
+        -content content.txt
+.Ed
+.Pp
+Create an encrypted message using 128-bit AES:
+.Bd -literal -offset indent
+openssl smime -encrypt -in plain.txt -aes128 \e
+        -out mail.msg cert.pem
+.Ed
+.Pp
+Add a signer to an existing message:
+.Bd -literal -offset indent
+openssl smime -resign -in mail.msg -signer newsign.pem \e
+        -out mail2.msg
+.Ed
+.Sh SMIME BUGS
+The
+.Em MIME
+parser isn't very clever: it seems to handle most messages that I've thrown
+at it, but it may choke on others.
+.Pp
+The code currently will only write out the signer's certificate to a file:
+if the signer has a separate encryption certificate this must be manually
+extracted.
+There should be some heuristic that determines the correct encryption
+certificate.
+.Pp
+Ideally, a database should be maintained of a certificate for each email
+address.
+.Pp
+The code doesn't currently take note of the permitted symmetric encryption
+algorithms as supplied in the
+.Em SMIMECapabilities
+signed attribute.
+This means the user has to manually include the correct encryption algorithm.
+It should store the list of permitted ciphers in a database and only use those.
+.Pp
+No revocation checking is done on the signer's certificate.
+.Pp
+The current code can only handle
+.Em S/MIME
+v2 messages; the more complex
+.Em S/MIME
+v3 structures may cause parsing errors.
+.Sh SMIME HISTORY
+The use of multiple
+.Fl signer
+options and the
+.Fl resign
+command were first added in
+.Nm OpenSSL
+1.0.0.
+.\"
+.\" SPEED
+.\"
+.Sh SPEED
+.nr nS 1
+.Nm "openssl speed"
+.Bk -words
+.Op Cm aes
+.Op Cm aes-128-cbc
+.Op Cm aes-192-cbc
+.Op Cm aes-256-cbc
+.Op Cm blowfish
+.Op Cm bf-cbc
+.Op Cm cast
+.Op Cm cast-cbc
+.Op Cm des
+.Op Cm des-cbc
+.Op Cm des-ede3
+.Op Cm dsa
+.Op Cm dsa512
+.Op Cm dsa1024
+.Op Cm dsa2048
+.Op Cm hmac
+.Op Cm md2
+.Op Cm md4
+.Op Cm md5
+.Op Cm rc2
+.Op Cm rc2-cbc
+.Op Cm rc4
+.Op Cm rmd160
+.Op Cm rsa
+.Op Cm rsa512
+.Op Cm rsa1024
+.Op Cm rsa2048
+.Op Cm rsa4096
+.Op Cm sha1
+.Op Fl decrypt
+.Op Fl elapsed
+.Op Fl engine Ar id
+.Op Fl evp Ar e
+.Op Fl mr
+.Op Fl multi Ar number
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm speed
+command is used to test the performance of cryptographic algorithms.
+.Bl -tag -width "XXXX"
+.It Bq Cm zero or more test algorithms
+If any options are given,
+.Nm speed
+tests those algorithms, otherwise all of the above are tested.
+.It Fl decrypt
+Time decryption instead of encryption
+.Pq only EVP .
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm speed
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl elapsed
+Measure time in real time instead of CPU user time.
+.It Fl evp Ar e
+Use EVP
+.Ar e .
+.It Fl mr
+Produce machine readable output.
+.It Fl multi Ar number
+Run
+.Ar number
+benchmarks in parallel.
+.El
+.\"
+.\" TS
+.\"
+.Sh TS
+.nr nS 1
+.Nm "openssl ts"
+.Bk -words
+.Fl query
+.Op Fl md4 | md5 | ripemd160 | sha | sha1
+.Op Fl cert
+.Op Fl config Ar configfile
+.Op Fl data Ar file_to_hash
+.Op Fl digest Ar digest_bytes
+.Op Fl in Ar request.tsq
+.Op Fl no_nonce
+.Op Fl out Ar request.tsq
+.Op Fl policy Ar object_id
+.Op Fl rand Ar file : Ns Ar file
+.Op Fl text
+.Ek
+.nr nS 0
+.Pp
+.nr nS 1
+.Nm "openssl ts"
+.Bk -words
+.Fl reply
+.Op Fl chain Ar certs_file.pem
+.Op Fl config Ar configfile
+.Op Fl engine Ar id
+.Op Fl in Ar response.tsr
+.Op Fl inkey Ar private.pem
+.Op Fl out Ar response.tsr
+.Op Fl passin Ar arg
+.Op Fl policy Ar object_id
+.Op Fl queryfile Ar request.tsq
+.Op Fl section Ar tsa_section
+.Op Fl signer Ar tsa_cert.pem
+.Op Fl text
+.Op Fl token_in
+.Op Fl token_out
+.Ek
+.nr nS 0
+.Pp
+.nr nS 1
+.Nm "openssl ts"
+.Bk -words
+.Fl verify
+.Op Fl CAfile Ar trusted_certs.pem
+.Op Fl CApath Ar trusted_cert_path
+.Op Fl data Ar file_to_hash
+.Op Fl digest Ar digest_bytes
+.Op Fl in Ar response.tsr
+.Op Fl queryfile Ar request.tsq
+.Op Fl token_in
+.Op Fl untrusted Ar cert_file.pem
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm ts
+command is a basic Time Stamping Authority (TSA) client and server
+application as specified in RFC 3161 (Time-Stamp Protocol, TSP).
+A TSA can be part of a PKI deployment and its role is to provide long
+term proof of the existence of a certain datum before a particular time.
+Here is a brief description of the protocol:
+.Bl -enum
+.It
+The TSA client computes a one-way hash value for a data file and sends
+the hash to the TSA.
+.It
+The TSA attaches the current date and time to the received hash value,
+signs them and sends the time stamp token back to the client.
+By creating this token the TSA certifies the existence of the original
+data file at the time of response generation.
+.It
+The TSA client receives the time stamp token and verifies the
+signature on it.
+It also checks if the token contains the same hash
+value that it had sent to the TSA.
+.El
+.Pp
+There is one DER-encoded protocol data unit defined for transporting a time
+stamp request to the TSA and one for sending the time stamp response
+back to the client.
+The
+.Nm ts
+command has three main functions:
+creating a time stamp request based on a data file;
+creating a time stamp response based on a request;
+and verifying if a response corresponds
+to a particular request or a data file.
+.Pp
+There is no support for sending the requests/responses automatically
+over HTTP or TCP yet as suggested in RFC 3161.
+Users must send the requests either by FTP or email.
+.Pp
+The
+.Fl query
+switch can be used for creating and printing a time stamp
+request with the following options:
+.Bl -tag -width Ds
+.It Fl cert
+The TSA is expected to include its signing certificate in the
+response.
+.It Fl config Ar configfile
+The configuration file to use.
+This option overrides the
+.Ev OPENSSL_CONF
+environment variable.
+Only the OID section of the config file is used with the
+.Fl query
+command.
+.It Fl data Ar file_to_hash
+The data file for which the time stamp request needs to be created.
+stdin is the default if neither the
+.Fl data
+nor the
+.Fl digest
+option is specified.
+.It Fl digest Ar digest_bytes
+It is possible to specify the message imprint explicitly without the data
+file.
+The imprint must be specified in a hexadecimal format,
+two characters per byte,
+the bytes optionally separated by colons (e.g. 1A:F6:01:... or 1AF601...).
+The number of bytes must match the message digest algorithm in use.
+.It Fl in Ar request.tsq
+This option specifies a previously created time stamp request in DER
+format that will be printed into the output file.
+Useful when you need to examine the content of a request in human-readable
+format.
+.It Fl md4|md5|ripemd160|sha|sha1
+The message digest to apply to the data file.
+It supports all the message digest algorithms that are supported by the
+.Nm dgst
+command.
+The default is SHA-1.
+.It Fl no_nonce
+No nonce is specified in the request if this option is given.
+Otherwise a 64-bit long pseudo-random none is
+included in the request.
+It is recommended to use nonce to protect against replay-attacks.
+.It Fl out Ar request.tsq
+Name of the output file to which the request will be written.
+The default is stdout.
+.It Fl policy Ar object_id
+The policy that the client expects the TSA to use for creating the
+time stamp token.
+Either the dotted OID notation or OID names defined
+in the config file can be used.
+If no policy is requested the TSA will
+use its own default policy.
+.It Fl rand Ar file : Ns Ar file
+The files containing random data for seeding the random number generator.
+Multiple files can be specified.
+The separator is
+.Sq \&;
+for MS-Windows;
+.Sq \&,
+for VMS; and
+.Sq \&:
+for all other platforms.
+.It Fl text
+If this option is specified the output is in human-readable text format
+instead of DER.
+.El
+.Pp
+A time stamp response (TimeStampResp) consists of a response status
+and the time stamp token itself (ContentInfo),
+if the token generation was successful.
+The
+.Fl reply
+command is for creating a time stamp
+response or time stamp token based on a request and printing the
+response/token in human-readable format.
+If
+.Fl token_out
+is not specified the output is always a time stamp response (TimeStampResp),
+otherwise it is a time stamp token (ContentInfo).
+.Bl -tag -width Ds
+.It Fl chain Ar certs_file.pem
+The collection of certificates, in PEM format,
+that will be included in the response
+in addition to the signer certificate if the
+.Fl cert
+option was used for the request.
+This file is supposed to contain the certificate chain
+for the signer certificate from its issuer upwards.
+The
+.Fl reply
+command does not build a certificate chain automatically.
+.It Fl config Ar configfile
+The configuration file to use.
+This option overrides the
+.Ev OPENSSL_CONF
+environment variable.
+See
+.Sx TS CONFIGURATION FILE OPTIONS
+for configurable variables.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm ts
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar response.tsr
+Specifies a previously created time stamp response or time stamp token, if
+.Fl token_in
+is also specified,
+in DER format that will be written to the output file.
+This option does not require a request;
+it is useful, for example,
+when you need to examine the content of a response or token
+or you want to extract the time stamp token from a response.
+If the input is a token and the output is a time stamp response a default
+.Dq granted
+status info is added to the token.
+.It Fl inkey Ar private.pem
+The signer private key of the TSA in PEM format.
+Overrides the
+.Cm signer_key
+config file option.
+.It Fl out Ar response.tsr
+The response is written to this file.
+The format and content of the file depends on other options (see
+.Fl text
+and
+.Fl token_out ) .
+The default is stdout.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl policy Ar object_id
+The default policy to use for the response unless the client
+explicitly requires a particular TSA policy.
+The OID can be specified either in dotted notation or with its name.
+Overrides the
+.Cm default_policy
+config file option.
+.It Fl queryfile Ar request.tsq
+The name of the file containing a DER-encoded time stamp request.
+.It Fl section Ar tsa_section
+The name of the config file section containing the settings for the
+response generation.
+If not specified the default TSA section is used; see
+.Sx TS CONFIGURATION FILE OPTIONS
+for details.
+.It Fl signer Ar tsa_cert.pem
+The signer certificate of the TSA in PEM format.
+The TSA signing certificate must have exactly one extended key usage
+assigned to it: timeStamping.
+The extended key usage must also be critical,
+otherwise the certificate is going to be refused.
+Overrides the
+.Cm signer_cert
+variable of the config file.
+.It Fl text
+If this option is specified the output is human-readable text format
+instead of DER.
+.It Fl token_in
+This flag can be used together with the
+.Fl in
+option and indicates that the input is a DER-encoded time stamp token
+(ContentInfo) instead of a time stamp response (TimeStampResp).
+.It Fl token_out
+The output is a time stamp token (ContentInfo) instead of time stamp
+response (TimeStampResp).
+.El
+.Pp
+The
+.Fl verify
+command is for verifying if a time stamp response or time stamp token
+is valid and matches a particular time stamp request or data file.
+The
+.Fl verify
+command does not use the configuration file.
+.Bl -tag -width Ds
+.It Fl CAfile Ar trusted_certs.pem
+The name of the file containing a set of trusted self-signed CA
+certificates in PEM format.
+See the similar option of
+.Nm verify
+for additional details.
+Either this option or
+.Fl CApath
+must be specified.
+.It Fl CApath Ar trusted_cert_path
+The name of the directory containing the trused CA certificates of the
+client.
+See the similar option of
+.Nm verify
+for additional details.
+Either this option or
+.Fl CAfile
+must be specified.
+.It Fl data Ar file_to_hash
+The response or token must be verified against
+.Ar file_to_hash .
+The file is hashed with the message digest algorithm specified in the token.
+The
+.Fl digest
+and
+.Fl queryfile
+options must not be specified with this one.
+.It Fl digest Ar digest_bytes
+The response or token must be verified against the message digest specified
+with this option.
+The number of bytes must match the message digest algorithm
+specified in the token.
+The
+.Fl data
+and
+.Fl queryfile
+options must not be specified with this one.
+.It Fl in Ar response.tsr
+The time stamp response that needs to be verified, in DER format.
+This option in mandatory.
+.It Fl queryfile Ar request.tsq
+The original time stamp request, in DER format.
+The
+.Fl data
+and
+.Fl digest
+options must not be specified with this one.
+.It Fl token_in
+This flag can be used together with the
+.Fl in
+option and indicates that the input is a DER-encoded time stamp token
+(ContentInfo) instead of a time stamp response (TimeStampResp).
+.It Fl untrusted Ar cert_file.pem
+Set of additional untrusted certificates in PEM format which may be
+needed when building the certificate chain for the TSA's signing
+certificate.
+This file must contain the TSA signing certificate and
+all intermediate CA certificates unless the response includes them.
+.El
+.Sh TS CONFIGURATION FILE OPTIONS
+The
+.Fl query
+and
+.Fl reply
+options make use of a configuration file defined by the
+.Ev OPENSSL_CONF
+environment variable.
+The
+.Fl query
+option uses only the symbolic OID names section
+and it can work without it.
+However, the
+.Fl reply
+option needs the config file for its operation.
+.Pp
+When there is a command line switch equivalent of a variable the
+switch always overrides the settings in the config file.
+.Bl -tag -width Ds
+.It Cm tsa Ar section , Cm default_tsa
+This is the main section and it specifies the name of another section
+that contains all the options for the
+.Fl reply
+option.
+This default section can be overridden with the
+.Fl section
+command line switch.
+.It Cm oid_file
+See
+.Nm ca
+for a description.
+.It Cm oid_section
+See
+.Nm ca
+for a description.
+.It Cm RANDFILE
+See
+.Nm ca
+for a description.
+.It Cm serial
+The name of the file containing the hexadecimal serial number of the
+last time stamp response created.
+This number is incremented by 1 for each response.
+If the file does not exist at the time of response
+generation a new file is created with serial number 1.
+This parameter is mandatory.
+.It Cm crypto_device
+Specifies the
+.Nm OpenSSL
+engine that will be set as the default for
+all available algorithms.
+.It Cm signer_cert
+TSA signing certificate, in PEM format.
+The same as the
+.Fl signer
+command line option.
+.It Cm certs
+A file containing a set of PEM-encoded certificates that need to be
+included in the response.
+The same as the
+.Fl chain
+command line option.
+.It Cm signer_key
+The private key of the TSA, in PEM format.
+The same as the
+.Fl inkey
+command line option.
+.It Cm default_policy
+The default policy to use when the request does not mandate any policy.
+The same as the
+.Fl policy
+command line option.
+.It Cm other_policies
+Comma separated list of policies that are also acceptable by the TSA
+and used only if the request explicitly specifies one of them.
+.It Cm digests
+The list of message digest algorithms that the TSA accepts.
+At least one algorithm must be specified.
+This parameter is mandatory.
+.It Cm accuracy
+The accuracy of the time source of the TSA in seconds, milliseconds
+and microseconds.
+For example, secs:1, millisecs:500, microsecs:100.
+If any of the components is missing,
+zero is assumed for that field.
+.It Cm clock_precision_digits
+Specifies the maximum number of digits, which represent the fraction of
+seconds, that need to be included in the time field.
+The trailing zeroes must be removed from the time,
+so there might actually be fewer digits,
+or no fraction of seconds at all.
+The maximum value is 6;
+the default is 0.
+.It Cm ordering
+If this option is yes,
+the responses generated by this TSA can always be ordered,
+even if the time difference between two responses is less
+than the sum of their accuracies.
+The default is no.
+.It Cm tsa_name
+Set this option to yes if the subject name of the TSA must be included in
+the TSA name field of the response.
+The default is no.
+.It Cm ess_cert_id_chain
+The SignedData objects created by the TSA always contain the
+certificate identifier of the signing certificate in a signed
+attribute (see RFC 2634, Enhanced Security Services).
+If this option is set to yes and either the
+.Cm certs
+variable or the
+.Fl chain
+option is specified then the certificate identifiers of the chain will also
+be included in the SigningCertificate signed attribute.
+If this variable is set to no,
+only the signing certificate identifier is included.
+The default is no.
+.El
+.Sh TS ENVIRONMENT VARIABLES
+.Ev OPENSSL_CONF
+contains the path of the configuration file and can be
+overridden by the
+.Fl config
+command line option.
+.Sh TS EXAMPLES
+All the examples below presume that
+.Ev OPENSSL_CONF
+is set to a proper configuration file,
+e.g. the example configuration file
+.Pa openssl/apps/openssl.cnf
+will do.
+.Pp
+To create a time stamp request for design1.txt with SHA-1
+without nonce and policy and no certificate is required in the response:
+.Bd -literal -offset indent
+$ openssl ts -query -data design1.txt -no_nonce \e
+        -out design1.tsq
+.Ed
+.Pp
+To create a similar time stamp request but specifying the message imprint
+explicitly:
+.Bd -literal -offset indent
+$ openssl ts -query \e
+        -digest b7e5d3f93198b38379852f2c04e78d73abdd0f4b \e
+        -no_nonce -out design1.tsq
+.Ed
+.Pp
+To print the content of the previous request in human readable format:
+.Bd -literal -offset indent
+$ openssl ts -query -in design1.tsq -text
+.Ed
+.Pp
+To create a time stamp request which includes the MD5 digest
+of design2.txt, requests the signer certificate and nonce,
+specifies a policy ID
+(assuming the tsa_policy1 name is defined in the
+OID section of the config file):
+.Bd -literal -offset indent
+$ openssl ts -query -data design2.txt -md5 \e
+        -policy tsa_policy1 -cert -out design2.tsq
+.Ed
+.Pp
+Before generating a response,
+a signing certificate must be created for the TSA that contains the
+.Cm timeStamping
+critical extended key usage extension
+without any other key usage extensions.
+You can add the
+.Dq extendedKeyUsage = critical,timeStamping
+line to the user certificate section
+of the config file to generate a proper certificate.
+See the
+.Nm req ,
+.Nm ca ,
+and
+.Nm x509
+commands for instructions.
+The examples below assume that cacert.pem contains the certificate of the CA,
+tsacert.pem is the signing certificate issued by cacert.pem and
+tsakey.pem is the private key of the TSA.
+.Pp
+To create a time stamp response for a request:
+.Bd -literal -offset indent
+$ openssl ts -reply -queryfile design1.tsq -inkey tsakey.pem \e
+        -signer tsacert.pem -out design1.tsr
+.Ed
+.Pp
+If you want to use the settings in the config file you could just write:
+.Bd -literal -offset indent
+$ openssl ts -reply -queryfile design1.tsq -out design1.tsr
+.Ed
+.Pp
+To print a time stamp reply to stdout in human readable format:
+.Bd -literal -offset indent
+$ openssl ts -reply -in design1.tsr -text
+.Ed
+.Pp
+To create a time stamp token instead of time stamp response:
+.Bd -literal -offset indent
+$ openssl ts -reply -queryfile design1.tsq \e
+        -out design1_token.der -token_out
+.Ed
+.Pp
+To print a time stamp token to stdout in human readable format:
+.Bd -literal -offset indent
+$ openssl ts -reply -in design1_token.der -token_in \e
+        -text -token_out
+.Ed
+.Pp
+To extract the time stamp token from a response:
+.Bd -literal -offset indent
+$ openssl ts -reply -in design1.tsr -out design1_token.der \e
+        -token_out
+.Ed
+.Pp
+To add
+.Dq granted
+status info to a time stamp token thereby creating a valid response:
+.Bd -literal -offset indent
+$ openssl ts -reply -in design1_token.der \e
+        -token_in -out design1.tsr
+.Ed
+.Pp
+To verify a time stamp reply against a request:
+.Bd -literal -offset indent
+$ openssl ts -verify -queryfile design1.tsq -in design1.tsr \e
+        -CAfile cacert.pem -untrusted tsacert.pem
+.Ed
+.Pp
+To verify a time stamp reply that includes the certificate chain:
+.Bd -literal -offset indent
+$ openssl ts -verify -queryfile design2.tsq -in design2.tsr \e
+        -CAfile cacert.pem
+.Ed
+.Pp
+To verify a time stamp token against the original data file:
+.Bd -literal -offset indent
+$ openssl ts -verify -data design2.txt -in design2.tsr \e
+        -CAfile cacert.pem
+.Ed
+.Pp
+To verify a time stamp token against a message imprint:
+.Bd -literal -offset indent
+$ openssl ts -verify \e
+        -digest b7e5d3f93198b38379852f2c04e78d73abdd0f4b \e
+        -in design2.tsr -CAfile cacert.pem
+.Ed
+.Sh TS BUGS
+No support for time stamps over SMTP, though it is quite easy
+to implement an automatic email-based TSA with
+.Xr procmail
+and
+.Xr perl 1 .
+HTTP server support is provided in the form of
+a separate
+.Xr httpd 8
+module.
+Pure TCP/IP is not supported.
+.Pp
+The file containing the last serial number of the TSA is not
+locked when being read or written.
+This is a problem if more than one instance of
+.Nm OpenSSL
+is trying to create a time stamp
+response at the same time.
+This is not an issue when using the
+.Xr httpd 8
+server module, which does proper locking.
+.Pp
+Look for the FIXME word in the source files.
+.Pp
+The source code should really be reviewed by somebody else, too.
+.Pp
+More testing is needed.
+.Sh TS AUTHORS
+.An Zoltan Glozik Aq zglozik@opentsa.org ,
+OpenTSA project
+.Pq Lk http://www.opentsa.org .
+.\"
+.\" SPKAC
+.\"
+.Sh SPKAC
+.nr nS 1
+.Nm "openssl spkac"
+.Bk -words
+.Op Fl challenge Ar string
+.Op Fl engine Ar id
+.Op Fl in Ar file
+.Op Fl key Ar keyfile
+.Op Fl noout
+.Op Fl out Ar file
+.Op Fl passin Ar arg
+.Op Fl pubkey
+.Op Fl spkac Ar spkacname
+.Op Fl spksect Ar section
+.Op Fl verify
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm spkac
+command processes Netscape signed public key and challenge
+.Pq SPKAC
+files.
+It can print out their contents, verify the signature,
+and produce its own SPKACs from a supplied private key.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl challenge Ar string
+Specifies the challenge string if an SPKAC is being created.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm spkac
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read from, or standard input if this option is not specified.
+Ignored if the
+.Fl key
+option is used.
+.It Fl key Ar keyfile
+Create an SPKAC file using the private key in
+.Ar keyfile .
+The
+.Fl in , noout , spksect ,
+and
+.Fl verify
+options are ignored if present.
+.It Fl noout
+Don't output the text version of the SPKAC
+.Pq not used if an SPKAC is being created .
+.It Fl out Ar file
+Specifies the output
+.Ar file
+to write to, or standard output by default.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.It Fl pubkey
+Output the public key of an SPKAC
+.Pq not used if an SPKAC is being created .
+.It Fl spkac Ar spkacname
+Allows an alternative name for the variable containing the SPKAC.
+The default is "SPKAC".
+This option affects both generated and input SPKAC files.
+.It Fl spksect Ar section
+Allows an alternative name for the
+.Ar section
+containing the SPKAC.
+The default is the default section.
+.It Fl verify
+Verifies the digital signature on the supplied SPKAC.
+.El
+.Sh SPKAC EXAMPLES
+Print out the contents of an SPKAC:
+.Pp
+.Dl $ openssl spkac -in spkac.cnf
+.Pp
+Verify the signature of an SPKAC:
+.Pp
+.Dl $ openssl spkac -in spkac.cnf -noout -verify
+.Pp
+Create an SPKAC using the challenge string
+.Qq hello :
+.Pp
+.Dl $ openssl spkac -key key.pem -challenge hello -out spkac.cnf
+.Pp
+Example of an SPKAC,
+.Pq long lines split up for clarity :
+.Bd -unfilled -offset indent
+SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA1cCoq2Wa3Ixs47uI7F\e
+PVwHVIPDx5yso105Y6zpozam135a8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03u\e
+PFoQIDAQABFgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJh1bEIYuc\e
+2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnDdq+NQ3F+X4deMx9AaEglZtULwV\e
+4=
+.Ed
+.Sh SPKAC NOTES
+A created SPKAC with suitable DN components appended can be fed into
+the
+.Nm ca
+utility.
+.Pp
+SPKACs are typically generated by Netscape when a form is submitted
+containing the
+.Em KEYGEN
+tag as part of the certificate enrollment process.
+.Pp
+The challenge string permits a primitive form of proof of possession
+of private key.
+By checking the SPKAC signature and a random challenge
+string, some guarantee is given that the user knows the private key
+corresponding to the public key being certified.
+This is important in some applications.
+Without this it is possible for a previous SPKAC
+to be used in a
+.Qq replay attack .
+.\"
+.\" VERIFY
+.\"
+.Sh VERIFY
+.nr nS 1
+.Nm "openssl verify"
+.Bk -words
+.Op Fl CAfile Ar file
+.Op Fl CApath Ar directory
+.Op Fl check_ss_sig
+.Op Fl crl_check
+.Op Fl crl_check_all
+.Op Fl engine Ar id
+.Op Fl explicit_policy
+.Op Fl extended_crl
+.Op Fl help
+.Op Fl ignore_critical
+.Op Fl inhibit_any
+.Op Fl inhibit_map
+.Op Fl issuer_checks
+.Op Fl policy_check
+.Op Fl purpose Ar purpose
+.Op Fl untrusted Ar file
+.Op Fl verbose
+.Op Fl x509_strict
+.Op Fl
+.Op Ar certificates
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm verify
+command verifies certificate chains.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl check_ss_sig
+Verify the signature on the self-signed root CA.
+This is disabled by default
+because it doesn't add any security.
+.It Fl CAfile Ar file
+A
+.Ar file
+of trusted certificates.
+The
+.Ar file
+should contain multiple certificates in PEM format, concatenated together.
+.It Fl CApath Ar directory
+A
+.Ar directory
+of trusted certificates.
+The certificates should have names of the form
+.Em hash.0 ,
+or have symbolic links to them of this form
+("hash" is the hashed certificate subject name: see the
+.Fl hash
+option of the
+.Nm x509
+utility).
+Under
+.Ux ,
+the
+.Nm c_rehash
+script will automatically create symbolic links to a directory of certificates.
+.It Fl crl_check
+Checks end entity certificate validity by attempting to look up a valid CRL.
+If a valid CRL cannot be found an error occurs.
+.It Fl crl_check_all
+Checks the validity of all certificates in the chain by attempting
+to look up valid CRLs.
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm verify
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl explicit_policy
+Set policy variable require-explicit-policy (see RFC 3280 et al).
+.It Fl extended_crl
+Enable extended CRL features such as indirect CRLs and alternate CRL
+signing keys.
+.It Fl help
+Prints out a usage message.
+.It Fl ignore_critical
+Normally if an unhandled critical extension is present which is not
+supported by
+.Nm OpenSSL ,
+the certificate is rejected (as required by RFC 3280 et al).
+If this option is set, critical extensions are ignored.
+.It Fl inhibit_any
+Set policy variable inhibit-any-policy (see RFC 3280 et al).
+.It Fl inhibit_map
+Set policy variable inhibit-policy-mapping (see RFC 3280 et al).
+.It Fl issuer_checks
+Print out diagnostics relating to searches for the issuer certificate
+of the current certificate.
+This shows why each candidate issuer certificate was rejected.
+However the presence of rejection messages
+does not itself imply that anything is wrong: during the normal
+verify process several rejections may take place.
+.It Fl policy_check
+Enables certificate policy processing.
+.It Fl purpose Ar purpose
+The intended use for the certificate.
+Without this option no chain verification will be done.
+Currently accepted uses are
+.Ar sslclient , sslserver ,
+.Ar nssslserver , smimesign ,
+.Ar smimeencrypt , crlsign ,
+.Ar any ,
+and
+.Ar ocsphelper .
+See the
+.Sx VERIFY OPERATION
+section for more information.
+.It Fl untrusted Ar file
+A
+.Ar file
+of untrusted certificates.
+The
+.Ar file
+should contain multiple certificates.
+.It Fl verbose
+Print extra information about the operations being performed.
+.It Fl x509_strict
+Disable workarounds for broken certificates which have to be disabled
+for strict X.509 compliance.
+.It Fl
+Marks the last option.
+All arguments following this are assumed to be certificate files.
+This is useful if the first certificate filename begins with a
+.Sq - .
+.It Ar certificates
+One or more
+.Ar certificates
+to verify.
+If no certificate files are included, an attempt is made to read
+a certificate from standard input.
+They should all be in PEM format.
+.El
+.Sh VERIFY OPERATION
+The
+.Nm verify
+program uses the same functions as the internal SSL and S/MIME verification,
+therefore this description applies to these verify operations too.
+.Pp
+There is one crucial difference between the verify operations performed
+by the
+.Nm verify
+program: wherever possible an attempt is made to continue
+after an error, whereas normally the verify operation would halt on the
+first error.
+This allows all the problems with a certificate chain to be determined.
+.Pp
+The verify operation consists of a number of separate steps:
+.Pp
+Firstly a certificate chain is built up starting from the supplied certificate
+and ending in the root CA.
+It is an error if the whole chain cannot be built up.
+The chain is built up by looking up the issuer's certificate of the current
+certificate.
+If a certificate is found which is its own issuer, it is assumed
+to be the root CA.
+.Pp
+The process of
+.Qq looking up the issuer's certificate
+itself involves a number of steps.
+In versions of
+.Nm OpenSSL
+before 0.9.5a the first certificate whose subject name matched the issuer
+of the current certificate was assumed to be the issuer's certificate.
+In
+.Nm OpenSSL
+0.9.6 and later all certificates whose subject name matches the issuer name
+of the current certificate are subject to further tests.
+The relevant authority key identifier components of the current certificate
+.Pq if present
+must match the subject key identifier
+.Pq if present
+and issuer and serial number of the candidate issuer; in addition the
+.Em keyUsage
+extension of the candidate issuer
+.Pq if present
+must permit certificate signing.
+.Pp
+The lookup first looks in the list of untrusted certificates and if no match
+is found the remaining lookups are from the trusted certificates.
+The root CA is always looked up in the trusted certificate list: if the
+certificate to verify is a root certificate, then an exact match must be
+found in the trusted list.
+.Pp
+The second operation is to check every untrusted certificate's extensions for
+consistency with the supplied purpose.
+If the
+.Fl purpose
+option is not included, then no checks are done.
+The supplied or
+.Qq leaf
+certificate must have extensions compatible with the supplied purpose
+and all other certificates must also be valid CA certificates.
+The precise extensions required are described in more detail in
+the
+.Sx X.509 CERTIFICATE EXTENSIONS
+section below.
+.Pp
+The third operation is to check the trust settings on the root CA.
+The root CA should be trusted for the supplied purpose.
+For compatibility with previous versions of
+.Nm SSLeay
+and
+.Nm OpenSSL ,
+a certificate with no trust settings is considered to be valid for
+all purposes.
+.Pp
+The final operation is to check the validity of the certificate chain.
+The validity period is checked against the current system time and the
+.Em notBefore
+and
+.Em notAfter
+dates in the certificate.
+The certificate signatures are also checked at this point.
+.Pp
+If all operations complete successfully, the certificate is considered
+valid.
+If any operation fails then the certificate is not valid.
+.Sh VERIFY DIAGNOSTICS
+When a verify operation fails, the output messages can be somewhat cryptic.
+The general form of the error message is:
+.Bd -unfilled
+\& server.pem: /C=AU/ST=Queensland/O=CryptSoft Pty Ltd/CN=Test CA (1024-bit)
+\& error 24 at 1 depth lookup:invalid CA certificate
+.Ed
+.Pp
+The first line contains the name of the certificate being verified, followed by
+the subject name of the certificate.
+The second line contains the error number and the depth.
+The depth is the number of the certificate being verified when a
+problem was detected starting with zero for the certificate being verified
+itself, then 1 for the CA that signed the certificate and so on.
+Finally a text version of the error number is presented.
+.Pp
+An exhaustive list of the error codes and messages is shown below; this also
+includes the name of the error code as defined in the header file
+.Aq Pa openssl/x509_vfy.h .
+Some of the error codes are defined but never returned: these are described
+as
+.Qq unused .
+.Bl -tag -width "XXXX"
+.It Ar "0 X509_V_OK: ok"
+The operation was successful.
+.It Ar 2 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate
+The issuer certificate could not be found: this occurs if the issuer certificate
+of an untrusted certificate cannot be found.
+.It Ar 3 X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL
+The CRL of a certificate could not be found.
+.It Ar 4 X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature
+The certificate signature could not be decrypted.
+This means that the actual signature value could not be determined rather
+than it not matching the expected value.
+This is only meaningful for RSA keys.
+.It Ar 5 X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt CRL's signature
+The CRL signature could not be decrypted: this means that the actual
+signature value could not be determined rather than it not matching the
+expected value.
+Unused.
+.It Ar 6 X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key
+The public key in the certificate
+.Em SubjectPublicKeyInfo
+could not be read.
+.It Ar 7 X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure
+The signature of the certificate is invalid.
+.It Ar 8 X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure
+The signature of the certificate is invalid.
+.It Ar 9 X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid
+The certificate is not yet valid: the
+.Em notBefore
+date is after the current time.
+.It Ar 10 X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired
+The certificate has expired; that is, the
+.Em notAfter
+date is before the current time.
+.It Ar 11 X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid
+The CRL is not yet valid.
+.It Ar 12 X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired
+The CRL has expired.
+.It Ar 13 X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field
+The certificate
+.Em notBefore
+field contains an invalid time.
+.It Ar 14 X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field
+The certificate
+.Em notAfter
+field contains an invalid time.
+.It Ar 15 X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field
+The CRL
+.Em lastUpdate
+field contains an invalid time.
+.It Ar 16 X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field
+The CRL
+.Em nextUpdate
+field contains an invalid time.
+.It Ar 17 X509_V_ERR_OUT_OF_MEM: out of memory
+An error occurred trying to allocate memory.
+This should never happen.
+.It Ar 18 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate
+The passed certificate is self-signed and the same certificate cannot be
+found in the list of trusted certificates.
+.It Ar 19 X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain
+The certificate chain could be built up using the untrusted certificates but
+the root could not be found locally.
+.It Ar 20 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate
+The issuer certificate of a locally looked up certificate could not be found.
+This normally means the list of trusted certificates is not complete.
+.It Ar 21 X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate
+No signatures could be verified because the chain contains only one
+certificate and it is not self-signed.
+.It Ar 22 X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long
+The certificate chain length is greater than the supplied maximum depth.
+Unused.
+.It Ar 23 X509_V_ERR_CERT_REVOKED: certificate revoked
+The certificate has been revoked.
+.It Ar 24 X509_V_ERR_INVALID_CA: invalid CA certificate
+A CA certificate is invalid.
+Either it is not a CA or its extensions are not consistent
+with the supplied purpose.
+.It Ar 25 X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded
+The
+.Em basicConstraints
+pathlength parameter has been exceeded.
+.It Ar 26 X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose
+The supplied certificate cannot be used for the specified purpose.
+.It Ar 27 X509_V_ERR_CERT_UNTRUSTED: certificate not trusted
+The root CA is not marked as trusted for the specified purpose.
+.It Ar 28 X509_V_ERR_CERT_REJECTED: certificate rejected
+The root CA is marked to reject the specified purpose.
+.It Ar 29 X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch
+The current candidate issuer certificate was rejected because its subject name
+did not match the issuer name of the current certificate.
+Only displayed when the
+.Fl issuer_checks
+option is set.
+.It Ar 30 X509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch
+The current candidate issuer certificate was rejected because its subject key
+identifier was present and did not match the authority key identifier current
+certificate.
+Only displayed when the
+.Fl issuer_checks
+option is set.
+.It Ar 31 X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch
+The current candidate issuer certificate was rejected because its issuer name
+and serial number were present and did not match the authority key identifier
+of the current certificate.
+Only displayed when the
+.Fl issuer_checks
+option is set.
+.It Ar 32 X509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing
+The current candidate issuer certificate was rejected because its
+.Em keyUsage
+extension does not permit certificate signing.
+.It Ar 50 X509_V_ERR_APPLICATION_VERIFICATION: application verification failure
+An application specific error.
+Unused.
+.El
+.Sh VERIFY BUGS
+Although the issuer checks are a considerable improvement over the old
+technique, they still suffer from limitations in the underlying
+X509_LOOKUP API.
+One consequence of this is that trusted certificates with matching subject
+name must either appear in a file (as specified by the
+.Fl CAfile
+option) or a directory (as specified by
+.Fl CApath ) .
+If they occur in both, only the certificates in the file will
+be recognised.
+.Pp
+Previous versions of
+.Nm OpenSSL
+assumed certificates with matching subject name were identical and
+mishandled them.
+.\"
+.\" VERSION
+.\"
+.Sh VERSION
+.Nm openssl version
+.Op Fl abdfopv
+.Pp
+The
+.Nm version
+command is used to print out version information about
+.Nm OpenSSL .
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl a
+All information: this is the same as setting all the other flags.
+.It Fl b
+The date the current version of
+.Nm OpenSSL
+was built.
+.It Fl d
+.Ev OPENSSLDIR
+setting.
+.It Fl f
+Compilation flags.
+.It Fl o
+Option information: various options set when the library was built.
+.It Fl p
+Platform setting.
+.It Fl v
+The current
+.Nm OpenSSL
+version.
+.El
+.Sh VERSION NOTES
+The output of
+.Nm openssl version -a
+would typically be used when sending in a bug report.
+.Sh VERSION HISTORY
+The
+.Fl d
+option was added in
+.Nm OpenSSL
+0.9.7.
+.\"
+.\" X509
+.\"
+.Sh X509
+.nr nS 1
+.Nm "openssl x509"
+.Bk -words
+.Op Fl C
+.Op Fl addreject Ar arg
+.Op Fl addtrust Ar arg
+.Op Fl alias
+.Op Fl CA Ar file
+.Op Fl CAcreateserial
+.Op Fl CAform Ar DER | PEM
+.Op Fl CAkey Ar file
+.Op Fl CAkeyform Ar DER | PEM
+.Op Fl CAserial Ar file
+.Op Fl certopt Ar option
+.Op Fl checkend Ar arg
+.Op Fl clrext
+.Op Fl clrreject
+.Op Fl clrtrust
+.Op Fl dates
+.Op Fl days Ar arg
+.Op Fl email
+.Op Fl enddate
+.Op Fl engine Ar id
+.Op Fl extensions Ar section
+.Op Fl extfile Ar file
+.Op Fl fingerprint
+.Op Fl hash
+.Op Fl in Ar file
+.Op Fl inform Ar DER | NET | PEM
+.Op Fl issuer
+.Op Fl issuer_hash
+.Op Fl issuer_hash_old
+.Op Fl keyform Ar DER | PEM
+.Op Fl md2 | md5 | sha1
+.Op Fl modulus
+.Op Fl nameopt Ar option
+.Op Fl noout
+.Op Fl ocsp_uri
+.Op Fl ocspid
+.Op Fl out Ar file
+.Op Fl outform Ar DER | NET | PEM
+.Op Fl passin Ar arg
+.Op Fl pubkey
+.Op Fl purpose
+.Op Fl req
+.Op Fl serial
+.Op Fl set_serial Ar n
+.Op Fl setalias Ar arg
+.Op Fl signkey Ar file
+.Op Fl startdate
+.Op Fl subject
+.Op Fl subject_hash
+.Op Fl subject_hash_old
+.Op Fl text
+.Op Fl trustout
+.Op Fl x509toreq
+.Ek
+.nr nS 0
+.Pp
+The
+.Nm x509
+command is a multi-purpose certificate utility.
+It can be used to display certificate information, convert certificates to
+various forms, sign certificate requests like a
+.Qq mini CA ,
+or edit certificate trust settings.
+.Pp
+Since there are a large number of options, they are split up into
+various sections.
+.Sh X509 INPUT, OUTPUT, AND GENERAL PURPOSE OPTIONS
+.Bl -tag -width "XXXX"
+.It Fl engine Ar id
+Specifying an engine (by its unique
+.Ar id
+string) will cause
+.Nm x509
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed.
+The engine will then be set as the default for all available algorithms.
+.It Fl in Ar file
+This specifies the input
+.Ar file
+to read a certificate from, or standard input if this option is not specified.
+.It Fl inform Ar DER | NET | PEM
+This specifies the input format.
+Normally, the command will expect an X.509 certificate,
+but this can change if other options such as
+.Fl req
+are present.
+The
+.Ar DER
+format is the DER encoding of the certificate and
+.Ar PEM
+is the base64 encoding of the DER encoding with header and footer lines added.
+The
+.Ar NET
+option is an obscure Netscape server format that is now
+obsolete.
+.It Fl md2 | md5 | sha1
+The digest to use.
+This affects any signing or display option that uses a message digest,
+such as the
+.Fl fingerprint , signkey ,
+and
+.Fl CA
+options.
+If not specified, MD5 is used.
+If the key being used to sign with is a DSA key,
+this option has no effect: SHA1 is always used with DSA keys.
+.It Fl out Ar file
+This specifies the output
+.Ar file
+to write to, or standard output by default.
+.It Fl outform Ar DER | NET | PEM
+This specifies the output format; the options have the same meaning as the
+.Fl inform
+option.
+.It Fl passin Ar arg
+The key password source.
+For more information about the format of
+.Ar arg ,
+see the
+.Sx PASS PHRASE ARGUMENTS
+section above.
+.El
+.Sh X509 DISPLAY OPTIONS
+.Sy Note :
+The
+.Fl alias
+and
+.Fl purpose
+options are also display options but are described in the
+.Sx X509 TRUST SETTINGS
+section.
+.Bl -tag -width "XXXX"
+.It Fl C
+This outputs the certificate in the form of a C source file.
+.It Fl certopt Ar option
+Customise the output format used with
+.Fl text .
+The
+.Ar option
+argument can be a single option or multiple options separated by commas.
+The
+.Fl certopt
+switch may also be used more than once to set multiple options.
+See the
+.Sx X509 TEXT OPTIONS
+section for more information.
+.It Fl dates
+Prints out the start and expiry dates of a certificate.
+.It Fl email
+Outputs the email address(es), if any.
+.It Fl enddate
+Prints out the expiry date of the certificate; that is, the
+.Em notAfter
+date.
+.It Fl fingerprint
+Prints out the digest of the DER-encoded version of the whole certificate
+(see
+.Sx DIGEST OPTIONS ) .
+.It Fl hash
+A synonym for
+.Fl subject_hash ,
+for backwards compatibility.
+.It Fl issuer
+Outputs the issuer name.
+.It Fl issuer_hash
+Outputs the
+.Qq hash
+of the certificate issuer name.
+.It Fl issuer_hash_old
+Outputs the
+.Qq hash
+of the certificate issuer name using the older algorithm
+as used by
+.Nm OpenSSL
+versions before 1.0.0.
+.It Fl modulus
+This option prints out the value of the modulus of the public key
+contained in the certificate.
+.It Fl nameopt Ar option
+Option which determines how the subject or issuer names are displayed.
+The
+.Ar option
+argument can be a single option or multiple options separated by commas.
+Alternatively, the
+.Fl nameopt
+switch may be used more than once to set multiple options.
+See the
+.Sx X509 NAME OPTIONS
+section for more information.
+.It Fl noout
+This option prevents output of the encoded version of the request.
+.It Fl ocsp_uri
+Outputs the OCSP responder addresses, if any.
+.It Fl ocspid
+Print OCSP hash values for the subject name and public key.
+.It Fl pubkey
+Output the public key.
+.It Fl serial
+Outputs the certificate serial number.
+.It Fl startdate
+Prints out the start date of the certificate; that is, the
+.Em notBefore
+date.
+.It Fl subject
+Outputs the subject name.
+.It Fl subject_hash
+Outputs the
+.Qq hash
+of the certificate subject name.
+This is used in
+.Nm OpenSSL
+to form an index to allow certificates in a directory to be looked up
+by subject name.
+.It Fl subject_hash_old
+Outputs the
+.Qq hash
+of the certificate subject name using the older algorithm
+as used by
+.Nm OpenSSL
+versions before 1.0.0.
+.It Fl text
+Prints out the certificate in text form.
+Full details are output including the public key, signature algorithms,
+issuer and subject names, serial number, any extensions present,
+and any trust settings.
+.El
+.Sh X509 TRUST SETTINGS
+Please note these options are currently experimental and may well change.
+.Pp
+A
+.Em trusted certificate
+is an ordinary certificate which has several
+additional pieces of information attached to it such as the permitted
+and prohibited uses of the certificate and an
+.Qq alias .
+.Pp
+Normally, when a certificate is being verified at least one certificate
+must be
+.Qq trusted .
+By default, a trusted certificate must be stored
+locally and must be a root CA: any certificate chain ending in this CA
+is then usable for any purpose.
+.Pp
+Trust settings currently are only used with a root CA.
+They allow a finer control over the purposes the root CA can be used for.
+For example, a CA may be trusted for an SSL client but not for
+SSL server use.
+.Pp
+See the description of the
+.Nm verify
+utility for more information on the meaning of trust settings.
+.Pp
+Future versions of
+.Nm OpenSSL
+will recognize trust settings on any certificate: not just root CAs.
+.Bl -tag -width "XXXX"
+.It Fl addreject Ar arg
+Adds a prohibited use.
+It accepts the same values as the
+.Fl addtrust
+option.
+.It Fl addtrust Ar arg
+Adds a trusted certificate use.
+Any object name can be used here, but currently only
+.Ar clientAuth
+.Pq SSL client use ,
+.Ar serverAuth
+.Pq SSL server use ,
+and
+.Ar emailProtection
+.Pq S/MIME email
+are used.
+Other
+.Nm OpenSSL
+applications may define additional uses.
+.It Fl alias
+Outputs the certificate alias, if any.
+.It Fl clrreject
+Clears all the prohibited or rejected uses of the certificate.
+.It Fl clrtrust
+Clears all the permitted or trusted uses of the certificate.
+.It Fl purpose
+This option performs tests on the certificate extensions and outputs
+the results.
+For a more complete description, see the
+.Sx X.509 CERTIFICATE EXTENSIONS
+section.
+.It Fl setalias Ar arg
+Sets the alias of the certificate.
+This will allow the certificate to be referred to using a nickname,
+for example
+.Qq Steve's Certificate .
+.It Fl trustout
+This causes
+.Nm x509
+to output a
+.Em trusted certificate .
+An ordinary or trusted certificate can be input, but by default an ordinary
+certificate is output and any trust settings are discarded.
+With the
+.Fl trustout
+option a trusted certificate is output.
+A trusted certificate is automatically output if any trust settings
+are modified.
+.El
+.Sh X509 SIGNING OPTIONS
+The
+.Nm x509
+utility can be used to sign certificates and requests: it
+can thus behave like a
+.Qq mini CA .
+.Bl -tag -width "XXXX"
+.It Fl CA Ar file
+Specifies the CA certificate to be used for signing.
+When this option is present,
+.Nm x509
+behaves like a
+.Qq mini CA .
+The input file is signed by the CA using this option;
+that is, its issuer name is set to the subject name of the CA and it is
+digitally signed using the CA's private key.
+.Pp
+This option is normally combined with the
+.Fl req
+option.
+Without the
+.Fl req
+option, the input is a certificate which must be self-signed.
+.It Fl CAcreateserial
+With this option the CA serial number file is created if it does not exist:
+it will contain the serial number
+.Sq 02
+and the certificate being signed will have
+.Sq 1
+as its serial number.
+Normally, if the
+.Fl CA
+option is specified and the serial number file does not exist, it is an error.
+.It Fl CAform Ar DER | PEM
+The format of the CA certificate file.
+The default is
+.Ar PEM .
+.It Fl CAkey Ar file
+Sets the CA private key to sign a certificate with.
+If this option is not specified, it is assumed that the CA private key
+is present in the CA certificate file.
+.It Fl CAkeyform Ar DER | PEM
+The format of the CA private key.
+The default is
+.Ar PEM .
+.It Fl CAserial Ar file
+Sets the CA serial number file to use.
+.Pp
+When the
+.Fl CA
+option is used to sign a certificate,
+it uses a serial number specified in a file.
+This file consists of one line containing an even number of hex digits
+with the serial number to use.
+After each use the serial number is incremented and written out
+to the file again.
+.Pp
+The default filename consists of the CA certificate file base name with
+.Pa .srl
+appended.
+For example, if the CA certificate file is called
+.Pa mycacert.pem ,
+it expects to find a serial number file called
+.Pa mycacert.srl .
+.It Fl checkend Ar arg
+Check whether the certificate expires in the next
+.Ar arg
+seconds.
+If so, exit with return value 1;
+otherwise exit with return value 0.
+.It Fl clrext
+Delete any extensions from a certificate.
+This option is used when a certificate is being created from another
+certificate (for example with the
+.Fl signkey
+or the
+.Fl CA
+options).
+Normally, all extensions are retained.
+.It Fl days Ar arg
+Specifies the number of days to make a certificate valid for.
+The default is 30 days.
+.It Fl extensions Ar section
+The section to add certificate extensions from.
+If this option is not specified, the extensions should either be
+contained in the unnamed
+.Pq default
+section or the default section should contain a variable called
+.Qq extensions
+which contains the section to use.
+.It Fl extfile Ar file
+File containing certificate extensions to use.
+If not specified, no extensions are added to the certificate.
+.It Fl keyform Ar DER | PEM
+Specifies the format
+.Pq DER or PEM
+of the private key file used in the
+.Fl signkey
+option.
+.It Fl req
+By default, a certificate is expected on input.
+With this option a certificate request is expected instead.
+.It Fl set_serial Ar n
+Specifies the serial number to use.
+This option can be used with either the
+.Fl signkey
+or
+.Fl CA
+options.
+If used in conjunction with the
+.Fl CA
+option, the serial number file (as specified by the
+.Fl CAserial
+or
+.Fl CAcreateserial
+options) is not used.
+.Pp
+The serial number can be decimal or hex (if preceded by
+.Sq 0x ) .
+Negative serial numbers can also be specified but their use is not recommended.
+.It Fl signkey Ar file
+This option causes the input file to be self-signed using the supplied
+private key.
+.Pp
+If the input file is a certificate, it sets the issuer name to the
+subject name
+.Pq i.e. makes it self-signed ,
+changes the public key to the supplied value,
+and changes the start and end dates.
+The start date is set to the current time and the end date is set to
+a value determined by the
+.Fl days
+option.
+Any certificate extensions are retained unless the
+.Fl clrext
+option is supplied.
+.Pp
+If the input is a certificate request, a self-signed certificate
+is created using the supplied private key using the subject name in
+the request.
+.It Fl x509toreq
+Converts a certificate into a certificate request.
+The
+.Fl signkey
+option is used to pass the required private key.
+.El
+.Sh X509 NAME OPTIONS
+The
+.Fl nameopt
+command line switch determines how the subject and issuer
+names are displayed.
+If no
+.Fl nameopt
+switch is present, the default
+.Qq oneline
+format is used which is compatible with previous versions of
+.Nm OpenSSL .
+Each option is described in detail below; all options can be preceded by a
+.Sq -
+to turn the option off.
+Only
+.Ar compat ,
+.Ar RFC2253 ,
+.Ar oneline ,
+and
+.Ar multiline
+will normally be used.
+.Bl -tag -width "XXXX"
+.It Ar align
+Align field values for a more readable output.
+Only usable with
+.Ar sep_multiline .
+.It Ar compat
+Use the old format.
+This is equivalent to specifying no name options at all.
+.It Ar dn_rev
+Reverse the fields of the DN.
+This is required by RFC 2253.
+As a side effect, this also reverses the order of multiple AVAs but this is
+permissible.
+.It Ar dump_all
+Dump all fields.
+This option, when used with
+.Ar dump_der ,
+allows the DER encoding of the structure to be unambiguously determined.
+.It Ar dump_der
+When this option is set, any fields that need to be hexdumped will
+be dumped using the DER encoding of the field.
+Otherwise just the content octets will be displayed.
+Both options use the RFC 2253 #XXXX... format.
+.It Ar dump_nostr
+Dump non-character string types
+.Pq for example OCTET STRING ;
+if this option is not set, non-character string types will be displayed
+as though each content octet represents a single character.
+.It Ar dump_unknown
+Dump any field whose OID is not recognised by
+.Nm OpenSSL .
+.It Ar esc_2253
+Escape the
+.Qq special
+characters required by RFC 2253 in a field that is
+.Dq \& ,+"\*(Lt\*(Gt; .
+Additionally,
+.Sq #
+is escaped at the beginning of a string
+and a space character at the beginning or end of a string.
+.It Ar esc_ctrl
+Escape control characters.
+That is, those with ASCII values less than 0x20
+.Pq space
+and the delete
+.Pq 0x7f
+character.
+They are escaped using the RFC 2253 \eXX notation (where XX are two hex
+digits representing the character value).
+.It Ar esc_msb
+Escape characters with the MSB set; that is, with ASCII values larger than
+127.
+.It Ar multiline
+A multiline format.
+It is equivalent to
+.Ar esc_ctrl , esc_msb , sep_multiline ,
+.Ar space_eq , lname ,
+and
+.Ar align .
+.It Ar no_type
+This option does not attempt to interpret multibyte characters in any
+way.
+That is, their content octets are merely dumped as though one octet
+represents each character.
+This is useful for diagnostic purposes but will result in rather odd
+looking output.
+.It Ar nofname , sname , lname , oid
+These options alter how the field name is displayed.
+.Ar nofname
+does not display the field at all.
+.Ar sname
+uses the
+.Qq short name
+form (CN for
+.Ar commonName ,
+for example).
+.Ar lname
+uses the long form.
+.Ar oid
+represents the OID in numerical form and is useful for diagnostic purpose.
+.It Ar oneline
+A oneline format which is more readable than
+.Ar RFC2253 .
+It is equivalent to specifying the
+.Ar esc_2253 , esc_ctrl , esc_msb , utf8 ,
+.Ar dump_nostr , dump_der , use_quote , sep_comma_plus_spc ,
+.Ar space_eq ,
+and
+.Ar sname
+options.
+.It Ar RFC2253
+Displays names compatible with RFC 2253; equivalent to
+.Ar esc_2253 , esc_ctrl ,
+.Ar esc_msb , utf8 , dump_nostr , dump_unknown ,
+.Ar dump_der , sep_comma_plus , dn_rev ,
+and
+.Ar sname .
+.It Ar sep_comma_plus , sep_comma_plus_space , sep_semi_plus_space , sep_multiline
+These options determine the field separators.
+The first character is between RDNs and the second between multiple AVAs
+(multiple AVAs are very rare and their use is discouraged).
+The options ending in
+.Qq space
+additionally place a space after the separator to make it more readable.
+The
+.Ar sep_multiline
+uses a linefeed character for the RDN separator and a spaced
+.Sq +
+for the AVA separator.
+It also indents the fields by four characters.
+.It Ar show_type
+Show the type of the ASN1 character string.
+The type precedes the field contents.
+For example
+.Qq BMPSTRING: Hello World .
+.It Ar space_eq
+Places spaces round the
+.Sq =
+character which follows the field name.
+.It Ar use_quote
+Escapes some characters by surrounding the whole string with
+.Sq \&"
+characters.
+Without the option, all escaping is done with the
+.Sq \e
+character.
+.It Ar utf8
+Convert all strings to UTF8 format first.
+This is required by RFC 2253.
+If you are lucky enough to have a UTF8 compatible terminal,
+the use of this option (and
+.Em not
+setting
+.Ar esc_msb )
+may result in the correct display of multibyte
+.Pq international
+characters.
+If this option is not present, multibyte characters larger than 0xff
+will be represented using the format \eUXXXX for 16 bits and \eWXXXXXXXX
+for 32 bits.
+Also, if this option is off, any UTF8Strings will be converted to their
+character form first.
+.El
+.Sh X509 TEXT OPTIONS
+As well as customising the name output format, it is also possible to
+customise the actual fields printed using the
+.Fl certopt
+options when the
+.Fl text
+option is present.
+The default behaviour is to print all fields.
+.Bl -tag -width "XXXX"
+.It Ar ca_default
+The value used by the
+.Nm ca
+utility; equivalent to
+.Ar no_issuer , no_pubkey , no_header ,
+.Ar no_version , no_sigdump ,
+and
+.Ar no_signame .
+.It Ar compatible
+Use the old format.
+This is equivalent to specifying no output options at all.
+.It Ar ext_default
+Retain default extension behaviour: attempt to print out unsupported
+certificate extensions.
+.It Ar ext_dump
+Hex dump unsupported extensions.
+.It Ar ext_error
+Print an error message for unsupported certificate extensions.
+.It Ar ext_parse
+ASN1 parse unsupported extensions.
+.It Ar no_aux
+Don't print out certificate trust information.
+.It Ar no_extensions
+Don't print out any X509V3 extensions.
+.It Ar no_header
+Don't print header information: that is, the lines saying
+.Qq Certificate
+and
+.Qq Data .
+.It Ar no_issuer
+Don't print out the issuer name.
+.It Ar no_pubkey
+Don't print out the public key.
+.It Ar no_serial
+Don't print out the serial number.
+.It Ar no_sigdump
+Don't give a hexadecimal dump of the certificate signature.
+.It Ar no_signame
+Don't print out the signature algorithm used.
+.It Ar no_subject
+Don't print out the subject name.
+.It Ar no_validity
+Don't print the validity; that is, the
+.Em notBefore
+and
+.Em notAfter
+fields.
+.It Ar no_version
+Don't print out the version number.
+.El
+.Sh X509 EXAMPLES
+Display the contents of a certificate:
+.Pp
+.Dl $ openssl x509 -in cert.pem -noout -text
+.Pp
+Display the certificate serial number:
+.Pp
+.Dl $ openssl x509 -in cert.pem -noout -serial
+.Pp
+Display the certificate subject name:
+.Pp
+.Dl $ openssl x509 -in cert.pem -noout -subject
+.Pp
+Display the certificate subject name in RFC 2253 form:
+.Pp
+.Dl $ openssl x509 -in cert.pem -noout -subject -nameopt RFC2253
+.Pp
+Display the certificate subject name in oneline form on a terminal
+supporting UTF8:
+.Bd -literal -offset indent
+$ openssl x509 -in cert.pem -noout -subject \e
+        -nameopt oneline,-esc_msb
+.Ed
+.Pp
+Display the certificate MD5 fingerprint:
+.Pp
+.Dl $ openssl x509 -in cert.pem -noout -fingerprint
+.Pp
+Display the certificate SHA1 fingerprint:
+.Pp
+.Dl $ openssl x509 -sha1 -in cert.pem -noout -fingerprint
+.Pp
+Convert a certificate from PEM to DER format:
+.Pp
+.Dl "$ openssl x509 -in cert.pem -inform PEM -out cert.der -outform DER"
+.Pp
+Convert a certificate to a certificate request:
+.Bd -literal -offset indent
+$ openssl x509 -x509toreq -in cert.pem -out req.pem \e
+        -signkey key.pem
+.Ed
+.Pp
+Convert a certificate request into a self-signed certificate using
+extensions for a CA:
+.Bd -literal -offset indent
+$ openssl x509 -req -in careq.pem -extfile openssl.cnf -extensions \e
+        v3_ca -signkey key.pem -out cacert.pem
+.Ed
+.Pp
+Sign a certificate request using the CA certificate above and add user
+certificate extensions:
+.Bd -literal -offset indent
+$ openssl x509 -req -in req.pem -extfile openssl.cnf -extensions \e
+        v3_usr -CA cacert.pem -CAkey key.pem -CAcreateserial
+.Ed
+.Pp
+Set a certificate to be trusted for SSL
+client use and set its alias to
+.Qq Steve's Class 1 CA :
+.Bd -literal -offset indent
+$ openssl x509 -in cert.pem -addtrust clientAuth \e
+        -setalias "Steve's Class 1 CA" -out trust.pem
+.Ed
+.Sh X509 NOTES
+The PEM format uses the header and footer lines:
+.Bd -unfilled -offset indent
+-----BEGIN CERTIFICATE-----
+-----END CERTIFICATE-----
+.Ed
+.Pp
+It will also handle files containing:
+.Bd -unfilled -offset indent
+-----BEGIN X509 CERTIFICATE-----
+-----END X509 CERTIFICATE-----
+.Ed
+.Pp
+Trusted certificates have the lines:
+.Bd -unfilled -offset indent
+-----BEGIN TRUSTED CERTIFICATE-----
+-----END TRUSTED CERTIFICATE-----
+.Ed
+.Pp
+The conversion to UTF8 format used with the name options assumes that
+T61Strings use the ISO 8859-1 character set.
+This is wrong, but Netscape and MSIE do this, as do many certificates.
+So although this is incorrect
+it is more likely to display the majority of certificates correctly.
+.Pp
+The
+.Fl fingerprint
+option takes the digest of the DER-encoded certificate.
+This is commonly called a
+.Qq fingerprint .
+Because of the nature of message digests, the fingerprint of a certificate
+is unique to that certificate and two certificates with the same fingerprint
+can be considered to be the same.
+.Pp
+The Netscape fingerprint uses MD5, whereas MSIE uses SHA1.
+.Pp
+The
+.Fl email
+option searches the subject name and the subject alternative
+name extension.
+Only unique email addresses will be printed out: it will
+not print the same address more than once.
+.Sh X.509 CERTIFICATE EXTENSIONS
+The
+.Fl purpose
+option checks the certificate extensions and determines
+what the certificate can be used for.
+The actual checks done are rather
+complex and include various hacks and workarounds to handle broken
+certificates and software.
+.Pp
+The same code is used when verifying untrusted certificates in chains,
+so this section is useful if a chain is rejected by the verify code.
+.Pp
+The
+.Em basicConstraints
+extension CA flag is used to determine whether the
+certificate can be used as a CA.
+If the CA flag is true, it is a CA;
+if the CA flag is false, it is not a CA.
+.Em All
+CAs should have the CA flag set to true.
+.Pp
+If the
+.Em basicConstraints
+extension is absent, then the certificate is
+considered to be a
+.Qq possible CA ;
+other extensions are checked according to the intended use of the certificate.
+A warning is given in this case because the certificate should really not
+be regarded as a CA: however,
+it is allowed to be a CA to work around some broken software.
+.Pp
+If the certificate is a V1 certificate
+.Pq and thus has no extensions
+and it is self-signed, it is also assumed to be a CA but a warning is again
+given: this is to work around the problem of Verisign roots which are V1
+self-signed certificates.
+.Pp
+If the
+.Em keyUsage
+extension is present, then additional restraints are
+made on the uses of the certificate.
+A CA certificate
+.Em must
+have the
+.Em keyCertSign
+bit set if the
+.Em keyUsage
+extension is present.
+.Pp
+The extended key usage extension places additional restrictions on the
+certificate uses.
+If this extension is present
+.Pq whether critical or not ,
+the key can only be used for the purposes specified.
+.Pp
+A complete description of each test is given below.
+The comments about
+.Em basicConstraints
+and
+.Em keyUsage
+and V1 certificates above apply to
+.Em all
+CA certificates.
+.Bl -tag -width "XXXX"
+.It Ar SSL Client
+The extended key usage extension must be absent or include the
+.Qq web client authentication
+OID.
+.Ar keyUsage
+must be absent or it must have the
+.Em digitalSignature
+bit set.
+Netscape certificate type must be absent or it must have the SSL
+client bit set.
+.It Ar SSL Client CA
+The extended key usage extension must be absent or include the
+.Qq web client authentication
+OID.
+Netscape certificate type must be absent or it must have the SSL CA
+bit set: this is used as a work around if the
+.Em basicConstraints
+extension is absent.
+.It Ar SSL Server
+The extended key usage extension must be absent or include the
+.Qq web server authentication
+and/or one of the SGC OIDs.
+.Em keyUsage
+must be absent or it must have the
+.Em digitalSignature
+set, the
+.Em keyEncipherment
+set, or both bits set.
+Netscape certificate type must be absent or have the SSL server bit set.
+.It Ar SSL Server CA
+The extended key usage extension must be absent or include the
+.Qq web server authentication
+and/or one of the SGC OIDs.
+Netscape certificate type must be absent or the SSL CA
+bit must be set: this is used as a work around if the
+.Em basicConstraints
+extension is absent.
+.It Ar Netscape SSL Server
+For Netscape SSL clients to connect to an SSL server; it must have the
+.Em keyEncipherment
+bit set if the
+.Em keyUsage
+extension is present.
+This isn't always valid because some cipher suites use the key for
+digital signing.
+Otherwise it is the same as a normal SSL server.
+.It Ar Common S/MIME Client Tests
+The extended key usage extension must be absent or include the
+.Qq email protection
+OID.
+Netscape certificate type must be absent or should have the
+.Em S/MIME
+bit set.
+If the
+.Em S/MIME
+bit is not set in Netscape certificate type, then the SSL
+client bit is tolerated as an alternative but a warning is shown:
+this is because some Verisign certificates don't set the
+.Em S/MIME
+bit.
+.It Ar S/MIME Signing
+In addition to the common
+.Em S/MIME
+client tests, the
+.Em digitalSignature
+bit must be set if the
+.Em keyUsage
+extension is present.
+.It Ar S/MIME Encryption
+In addition to the common
+.Em S/MIME
+tests, the
+.Em keyEncipherment
+bit must be set if the
+.Em keyUsage
+extension is present.
+.It Ar S/MIME CA
+The extended key usage extension must be absent or include the
+.Qq email protection
+OID.
+Netscape certificate type must be absent or must have the
+.Em S/MIME CA
+bit set: this is used as a work around if the
+.Em basicConstraints
+extension is absent.
+.It Ar CRL Signing
+The
+.Em keyUsage
+extension must be absent or it must have the
+.Em CRL
+signing bit set.
+.It Ar CRL Signing CA
+The normal CA tests apply.
+Except in this case the
+.Em basicConstraints
+extension must be present.
+.El
+.Sh X509 BUGS
+Extensions in certificates are not transferred to certificate requests and
+vice versa.
+.Pp
+It is possible to produce invalid certificates or requests by specifying the
+wrong private key or using inconsistent options in some cases: these should
+be checked.
+.Pp
+There should be options to explicitly set such things as start and end dates,
+rather than an offset from the current time.
+.Pp
+The code to implement the verify behaviour described in the
+.Sx X509 TRUST SETTINGS
+is currently being developed.
+It thus describes the intended behaviour rather than the current behaviour.
+It is hoped that it will represent reality in
+.Nm OpenSSL
+0.9.5 and later.
+.Sh X509 HISTORY
+Before
+.Nm OpenSSL
+0.9.8,
+the default digest for RSA keys was MD5.
+.Pp
+The hash algorithm used in the
+.Fl subject_hash
+and
+.Fl issuer_hash
+options before
+.Nm OpenSSL
+1.0.0 was based on the deprecated MD5 algorithm and the encoding
+of the distinguished name.
+In
+.Nm OpenSSL
+1.0.0 and later it is based on a canonical version of the DN using SHA1.
+This means that any directories using the old form
+must have their links rebuilt using
+.Ar c_rehash
+or similar.
+.\"
+.\" FILES
+.\"
+.Sh FILES
+.Bl -tag -width "/etc/ssl/openssl.cnf" -compact
+.It /etc/ssl/
+Default config directory for
+.Nm openssl .
+.It /etc/ssl/lib/
+Unused.
+.It /etc/ssl/private/
+Default private key directory.
+.It /etc/ssl/openssl.cnf
+Default configuration file for
+.Nm openssl .
+.It /etc/ssl/x509v3.cnf
+Default configuration file for
+.Nm x509
+certificates.
+.El
+.\"
+.\" SEE ALSO
+.\"
+.Sh SEE ALSO
+.Xr httpd 8 ,
+.Xr sendmail 8 ,
+.Xr ssl 8 ,
+.Xr starttls 8
+.Sh STANDARDS
+.Rs
+.%D February 1995
+.%Q Netscape Communications Corp.
+.%T The SSL Protocol
+.Re
+.Pp
+.Rs
+.%D November 1996
+.%Q Netscape Communications Corp.
+.%T The SSL 3.0 Protocol
+.Re
+.Pp
+.Rs
+.%A T. Dierks
+.%A C. Allen
+.%D January 1999
+.%R RFC 2246
+.%T The TLS Protocol Version 1.0
+.Re
+.Pp
+.Rs
+.%A M. Wahl
+.%A S. Killie
+.%A T. Howes
+.%D December 1997
+.%R RFC 2253
+.%T Lightweight Directory Access Protocol (v3): UTF-8 String Representation of Distinguished Names
+.Re
+.Pp
+.Rs
+.%A B. Kaliski
+.%D March 1998
+.%R RFC 2315
+.%T PKCS #7: Cryptographic Message Syntax Version 1.5
+.Re
+.Pp
+.Rs
+.%A R. Housley
+.%A W. Ford
+.%A W. Polk
+.%A D. Solo
+.%D January 1999
+.%R RFC 2459
+.%T Internet X.509 Public Key Infrastructure Certificate and CRL Profile
+.Re
+.Pp
+.Rs
+.%A M. Myers
+.%A R. Ankney
+.%A A. Malpani
+.%A S. Galperin
+.%A C. Adams
+.%D June 1999
+.%R RFC 2560
+.%T X.509 Internet Public Key Infrastructure Online Certificate Status Protocol \(en OCSP
+.Re
+.Pp
+.Rs
+.%A R. Housley
+.%D June 1999
+.%R RFC 2630
+.%T Cryptographic Message Syntax
+.Re
+.Pp
+.Rs
+.%A P. Chown
+.%D June 2002
+.%R RFC 3268
+.%T Advanced Encryption Standard (AES) Ciphersuites for Transport Layer Security(TLS)
+.Re
+.\"
+.\" OPENSSL HISTORY
+.\"
+.Sh HISTORY
+The
+.Xr openssl 1
+document appeared in
+.Nm OpenSSL
+0.9.2.
+The
+.Cm list- Ns XXX Ns Cm -commands
+pseudo-commands were added in
+.Nm OpenSSL
+0.9.3;
+the
+.Cm no- Ns XXX
+pseudo-commands were added in
+.Nm OpenSSL
+0.9.5a;
+the
+.Cm list- Ns XXX Ns Cm -algorithms
+pseudo-commands were added in
+.Nm OpenSSL
+1.0.0.