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-.\"     $OpenBSD: crypto.3,v 1.30 2024/12/07 19:22:15 schwarze Exp $
-.\"     OpenSSL a9c85cea Nov 11 09:33:55 2016 +0100
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" The original file was written by Ulf Moeller <ulf@openssl.org> and
-.\" Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000, 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.
-.\"
-.Dd $Mdocdate: December 7 2024 $
-.Dt CRYPTO 3
-.Os
-.Sh NAME
-.Nm crypto
-.Nd OpenSSL cryptographic library
-.Sh DESCRIPTION
-The OpenSSL crypto library implements a wide range of cryptographic
-algorithms used in various Internet standards.
-The services provided by this library are used by the OpenSSL
-implementations of TLS and S/MIME, and they have also been used to
-implement SSH, OpenPGP, and other cryptographic standards.
-.Pp
-.Sy Symmetric ciphers
-including AES, Blowfish, CAST, ChaCha20, IDEA, DES, RC2, and RC4
-are provided by the generic interface
-.Xr EVP_EncryptInit 3 .
-Low-level stand-alone interfaces include
-.Xr AES_encrypt 3 ,
-.Xr BF_set_key 3 ,
-.Xr ChaCha 3 ,
-.Xr DES_set_key 3 ,
-.Xr RC2_encrypt 3 ,
-and
-.Xr RC4 3 .
-.Pp
-.Sy Public key cryptography and key agreement
-are provided by
-.Xr DH_new 3 ,
-.Xr ECDH_compute_key 3 ,
-.Xr X25519 3 ,
-.Xr DSA_new 3 ,
-.Xr ECDSA_SIG_new 3 ,
-.Xr RSA_new 3 ,
-and
-.Xr EVP_PKEY_new 3 .
-.Pp
-.Sy Certificates
-are handled by
-.Xr X509_new 3
-and
-.Xr X509v3_add_ext 3 .
-.Pp
-.Sy Authentication codes and hash functions
-offered include
-.Xr EVP_DigestInit 3 ,
-.Xr CMAC_Init 3 ,
-.Xr HMAC 3 ,
-.Xr MD4 3 ,
-.Xr MD5 3 ,
-.Xr RIPEMD160 3 ,
-.Xr SHA1 3 ,
-and
-.Xr SHA256 3 .
-.Pp
-.Sy Input, output, and data encoding
-facilities include
-.Xr ASN1_TYPE_get 3 ,
-.Xr BIO_new 3 ,
-.Xr CMS_ContentInfo_new 3 ,
-.Xr evp 3 ,
-.Xr EVP_EncodeInit 3 ,
-.Xr PEM_read 3 ,
-.Xr PKCS7_encrypt 3 ,
-.Xr PKCS7_sign 3 ,
-.Xr PKCS12_create 3 ,
-and
-.Xr SMIME_write_PKCS7 3 .
-.Pp
-.Sy Auxiliary features include:
-.Bl -dash -compact
-.It
-configuration file handling: see
-.Xr OPENSSL_config 3
-.It
-error reporting: see
-.Xr ERR 3
-.It
-.Xr OCSP_REQUEST_new 3
-.It
-.Xr UI_new 3
-.El
-.Pp
-.Sy Internal utilities
-include
-.Xr BIO_f_buffer 3 ,
-.Xr BN_new 3 ,
-.Xr EC_GROUP_new 3 ,
-.Xr lh_new 3 ,
-and
-.Xr STACK_OF 3 .
-.Sh NAMING CONVENTIONS
-Elements used in the names of API functions include the following:
-.Bl -tag -width Ds
-.It add0
-See
-.Dq set0
-below.
-.It add1
-See
-.Dq set1
-below.
-.It BIO
-basic input and/or output abstraction:
-The function manipulates objects of the idiosyncratic OpenSSL
-.Vt BIO
-object type.
-See
-.Xr BIO_new 3 .
-.It bio
-The function uses a
-.Vt BIO
-object for input or output.
-In many cases, simpler variants of the function are available
-that operate directly on
-.In stdio.h
-.Vt FILE
-objects or directly in RAM, usually using byte arrays.
-.It BIO_f_
-filter BIO:
-The function returns a pointer to a static built-in object that,
-when passed to
-.Xr BIO_new 3 ,
-results in the creation of a BIO object that can write data to
-and/or read data from another
-.Vt BIO
-object.
-.It BIO_s_
-source and/or sink BIO:
-The function returns a pointer to a static built-in object that,
-when passed to
-.Xr BIO_new 3 ,
-results in the creation of a BIO object
-that can write data to an external destination
-and/or read data from an external source,
-for example a file descriptor or object, a memory buffer, or the network.
-.It BN
-big number:
-The function operates on
-.Vt BIGNUM
-objects representing integer numbers of variable, almost unlimited size.
-See
-.Xr BN_new 3 .
-.It cb
-callback:
-The function takes or returns a function pointer
-that is called by API functions from inside the library.
-The function pointed to may be defined by the application program.
-In some cases, API functions with
-.Dq cb
-in their name may return function pointers to internal functions
-defined inside the library that are not API functions.
-The element
-.Dq cb
-is also used in the names of some function pointer datatypes
-declared with
-.Sy typedef .
-In a small number of cases, the all caps form
-.Dq CB
-is used with the same meaning.
-.It CTX
-context:
-The function operates on a wrapper object around another object.
-The purposes and properties of such
-.Dq CTX
-wrapper objects vary wildly depending on the objects in question.
-A few function names use the lower case form
-.Dq ctx
-in the same sense.
-.It d2i
-DER to internal:
-The function decodes input conforming to ASN.1 basic encoding rules (BER)
-and either stores the result in an existing object
-or in a newly allocated object.
-The latter is usually preferable because
-creating a new object is more robust and less error prone.
-In spite of the name, the input usually does not need to conform to ASN.1
-distinguished encoding rules (DER), which are more restrictive than BER.
-.It EVP
-digital EnVeloPe library:
-See
-.Xr evp 3 .
-.It ex
-This name element is used for two completely unrelated purposes.
-.Pp
-extended version:
-The function is similar to an older function without the
-.Dq ex
-in its name, but takes one or more additional arguments
-in order to make it more versatile.
-In several cases, the older version is now deprecated.
-.Pp
-extra data:
-Some object types support storing additional, application-specific data
-inside objects in addition to the data the object is designed to hold.
-The function sets, retrieves, or prepares for using such extra data.
-Related function names usually contain
-.Dq ex_data
-or
-.Dq ex_new_index .
-See
-.Xr CRYPTO_set_ex_data 3 .
-.It fp
-file pointer:
-The function takes a
-.Vt FILE *
-argument.
-Usually, the function is a variant of another function taking a
-.Vt BIO *
-argument instead.
-.It i2d
-internal to DER:
-The function encodes an object passed as an argument
-according to ASN.1 distinguished encoding rules (DER).
-There are a few rare exceptions of functions that have
-.Dq i2d
-in their name but produce output anyway
-that only conforms to ASN.1 basic encoding rules (BER) and not to DER.
-.It get0
-The function returns an internal pointer
-owned by the object passed as an argument.
-The returned pointer must not be freed by the calling code.
-It will be freed automatically
-when the object owning the pointer will be freed.
-.It get1
-The function returns a copy of a sub-object
-of an object passed as an argument.
-The caller is responsible for freeing the returned object
-when it is no longer needed.
-.Pp
-If the object type is reference counted, usually the reference count
-is incremented instead of copying the object.
-Consequently, modifying the returned object may still impact all
-objects containing references to it.
-The caller is responsible for freeing the returned object
-when it is no longer needed; for reference-counted objects still
-referenced elsewhere, this will merely decrement the reference count.
-.It get
-Functions containing
-.Dq get
-in their name without a following digit may behave in
-.Dq get0
-or, more rarely, in
-.Dq get1
-style.
-To find out which is the case, refer to the individual manual pages.
-.It lh
-linear hash:
-The function manipulates a dynamic hash table.
-See
-.Xr lh_new 3 .
-.It md
-message digest.
-Some function names use the all caps form
-.Dq MD
-in the same sense.
-.It meth
-The function manipulates an object holding a function table.
-Usually, such function tables allow the application program
-to implement additional cryptographic or I/O algorithms
-and to use them with the same high-level API functions as the
-algorithms provided by the library itself, or to replace the
-implementations of algorithms provided by the library with
-custom implementations provided by the application program.
-Some API functions use the name elements
-.Dq method
-or
-.Dq METHOD
-in the same sense.
-See also the
-.Dq cb
-entry in the present list.
-.It nid
-numerical identifier:
-A non-standard, LibreSSL-specific
-.Vt int
-number associated with an ASN.1 object identifier.
-In several cases, the all caps form
-.Dq NID
-is used in the same sense.
-See
-.Xr OBJ_nid2obj 3 .
-.It obj
-This name element and its all caps form
-.Dq OBJ
-usually refer to ASN.1 object identifiers represented by the
-.Vt ASN1_OBJECT
-data type.
-See
-.Xr ASN1_OBJECT_new 3 .
-.It PKEY
-In most cases, this name element and its lower case form
-.Dq pkey
-mean
-.Dq private key ,
-but for both forms, there are some cases where they mean
-.Dq public key
-instead.
-.It set0
-The function transfers ownership of a pointer passed as an argument
-to an object passed as another argument,
-by storing the pointer inside the object.
-The transferred pointer must not be freed by the calling code.
-It will be freed automatically
-when the object now owning the pointer will be freed.
-.It set1
-The function copies the content of one object passed as an argument
-into another object also passed as an argument.
-When the calling code no longer needs the copied object,
-it can free that object.
-.Pp
-In some cases, if the object to be copied is reference counted,
-the function does not actually copy the object but merely increments
-its reference count and stores the pointer to it in the other object.
-When the calling code no longer needs its original pointer to
-the now inner object, it can free the original pointer, thus
-decrementing the reference count of the inner object
-and transferring ownership of the inner object to the outer object.
-The inner object will then be freed automatically
-when the outer object is freed later on.
-.It set
-Functions containing
-.Dq set
-in their name without a following digit may behave in
-.Dq set0
-or, more rarely, in
-.Dq set1
-style.
-To find out which is the case, refer to the individual manual pages.
-.It sk
-stack:
-The function manipulates a variable-sized array of pointers
-in the idiosyncratic style described in
-.Xr OPENSSL_sk_new 3 .
-.It TS
-X.509 time-stamp protocol:
-See
-.Xr TS_REQ_new 3 .
-.It up_ref
-The function increments the reference count of the argument by one.
-Only a minority of object types support reference counting.
-For those that do, if the reference count is greater than one,
-the corresponding
-.Dq free
-function reverses the effect of one call to the
-.Dq up_ref
-function rather than freeing the object.
-.El
-.Sh SEE ALSO
-.Xr openssl 1 ,
-.Xr ssl 3