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-.\"
-.\"     $OpenBSD: SSL_CIPHER_get_name.3,v 1.2 2014/12/02 14:11:01 jmc Exp $
-.\"
-.Dd $Mdocdate: December 2 2014 $
-.Dt SSL_CIPHER_GET_NAME 3
-.Os
-.Sh NAME
-.Nm SSL_CIPHER_get_name ,
-.Nm SSL_CIPHER_get_bits ,
-.Nm SSL_CIPHER_get_version ,
-.Nm SSL_CIPHER_description
-.Nd get SSL_CIPHER properties
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft const char *
-.Fn SSL_CIPHER_get_name "const SSL_CIPHER *cipher"
-.Ft int
-.Fn SSL_CIPHER_get_bits "const SSL_CIPHER *cipher" "int *alg_bits"
-.Ft char *
-.Fn SSL_CIPHER_get_version "const SSL_CIPHER *cipher"
-.Ft char *
-.Fn SSL_CIPHER_description "const SSL_CIPHER *cipher" "char *buf" "int size"
-.Sh DESCRIPTION
-.Fn SSL_CIPHER_get_name
-returns a pointer to the name of
-.Fa cipher .
-If the
-argument is the
-.Dv NULL
-pointer, a pointer to the constant value
-.Qq NONE
-is returned.
-.Pp
-.Fn SSL_CIPHER_get_bits
-returns the number of secret bits used for
-.Fa cipher .
-If
-.Fa alg_bits
-is not
-.Dv NULL ,
-it contains the number of bits processed by the
-chosen algorithm.
-If
-.Fa cipher
-is
-.Dv NULL ,
-0 is returned.
-.Pp
-.Fn SSL_CIPHER_get_version
-returns a string which indicates the SSL/TLS protocol version that first
-defined the cipher.
-This is currently
-.Qq SSLv2
-or
-.Qq TLSv1/SSLv3 .
-In some cases it should possibly return
-.Qq TLSv1.2
-but the function does not; use
-.Xr SSL_CIPHER_description 3
-instead.
-If
-.Fa cipher
-is
-.Dv NULL ,
-.Qq (NONE)
-is returned.
-.Pp
-.Fn SSL_CIPHER_description
-returns a textual description of the cipher used into the buffer
-.Fa buf
-of length
-.Fa len
-provided.
-If
-.Fa buf
-is
-.Dv NULL ,
-a buffer is allocated using
-.Xr asprintf 3 ;
-that buffer should be freed using the
-.Xr free 3
-function.
-If
-.Fa len
-is too small, or if
-.Fa buf
-is
-.Dv NULL
-and the allocation fails, a pointer to the string
-.Qq Buffer too small
-is returned.
-.Sh NOTES
-The number of bits processed can be different from the secret bits.
-For example, an export cipher like EXP-RC4-MD5 has only 40 secret bits.
-The algorithm does use the full 128 bits (which would be returned for
-.Fa alg_bits ) ,
-but 88 bits are fixed.
-The search space is hence only 40 bits.
-.Pp
-The string returned by
-.Fn SSL_CIPHER_description
-in case of success consists
-of cleartext information separated by one or more blanks in the following
-sequence:
-.Bl -tag -width Ds
-.It Aq Ar ciphername
-Textual representation of the cipher name.
-.It Aq Ar protocol version
-Protocol version:
-.Em SSLv2 ,
-.Em SSLv3 ,
-.Em TLSv1.2 .
-The TLSv1.0 ciphers are flagged with SSLv3.
-No new ciphers were added by TLSv1.1.
-.It Kx= Ns Aq Ar key exchange
-Key exchange method:
-.Em RSA
-(for export ciphers as
-.Em RSA(512)
-or
-.Em RSA(1024) ) ,
-.Em DH
-(for export ciphers as
-.Em DH(512)
-or
-.Em DH(1024) ) ,
-.Em DH/RSA ,
-.Em DH/DSS ,
-.Em Fortezza .
-.It Au= Ns Aq Ar authentication
-Authentication method:
-.Em RSA ,
-.Em DSS ,
-.Em DH ,
-.Em None .
-.Em None
-is the representation of anonymous ciphers.
-.It Enc= Ns Aq Ar symmetric encryption method
-Encryption method with number of secret bits:
-.Em DES(40) ,
-.Em DES(56) ,
-.Em 3DES(168) ,
-.Em RC4(40) ,
-.Em RC4(56) ,
-.Em RC4(64) ,
-.Em RC4(128) ,
-.Em RC2(40) ,
-.Em RC2(56) ,
-.Em RC2(128) ,
-.Em IDEA(128) ,
-.Em Fortezza ,
-.Em None .
-.It Mac= Ns Aq Ar message authentication code
-Message digest:
-.Em MD5 ,
-.Em SHA1 .
-.It Aq Ar export flag
-If the cipher is flagged exportable with respect to old US crypto
-regulations, the word
-.Dq export
-is printed.
-.El
-.Sh RETURN VALUES
-See
-.Sx DESCRIPTION
-.Sh EXAMPLES
-Some examples for the output of
-.Fn SSL_CIPHER_description :
-.D1 "EDH-RSA-DES-CBC3-SHA    SSLv3 Kx=DH       Au=RSA  Enc=3DES(168) Mac=SHA1"
-.D1 "EDH-DSS-DES-CBC3-SHA    SSLv3 Kx=DH       Au=DSS  Enc=3DES(168) Mac=SHA1"
-.D1 "RC4-MD5                 SSLv3 Kx=RSA      Au=RSA  Enc=RC4(128)  Mac=MD5"
-.D1 "EXP-RC4-MD5             SSLv3 Kx=RSA(512) Au=RSA  Enc=RC4(40)   Mac=MD5  export"
-.Pp
-A complete list can be retrieved by invoking the following command:
-.Pp
-.Dl $ openssl ciphers -v ALL
-.Sh SEE ALSO
-.Xr openssl 1 ,
-.Xr ssl 3 ,
-.Xr SSL_get_ciphers 3 ,
-.Xr SSL_get_current_cipher 3
-.Sh BUGS
-If
-.Fn SSL_CIPHER_description
-is called with
-.Fa cipher
-being
-.Dv NULL ,
-the library crashes.
-.Pp
-If
-.Fn SSL_CIPHER_description
-cannot handle a built-in cipher,
-the according description of the cipher property is
-.Qq unknown .
-This case should not occur.