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-.\" $OpenBSD: SSL_CIPHER_get_name.3,v 1.17 2024/07/16 10:19:38 tb Exp $
-.\" full merge up to: OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
-.\" selective merge up to: OpenSSL 61f805c1 Jan 16 01:01:46 2018 +0800
-.\"
-.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>,
-.\" Dr. Stephen Henson <steve@openssl.org>, Todd Short <tshort@akamai.com>,
-.\" and Paul Yang <yang.yang@baishancloud.com>.
-.\" Copyright (c) 2000, 2005, 2009, 2013, 2014, 2015, 2016, 2017
-.\" 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,
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-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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-.\"
-.Dd $Mdocdate: July 16 2024 $
-.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_get_cipher_nid ,
-.Nm SSL_CIPHER_get_digest_nid ,
-.Nm SSL_CIPHER_get_handshake_digest ,
-.Nm SSL_CIPHER_get_kx_nid ,
-.Nm SSL_CIPHER_get_auth_nid ,
-.Nm SSL_CIPHER_is_aead ,
-.Nm SSL_CIPHER_find ,
-.Nm SSL_CIPHER_get_id ,
-.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 const char *
-.Fn SSL_CIPHER_get_version "const SSL_CIPHER *cipher"
-.Ft int
-.Fn SSL_CIPHER_get_cipher_nid "const SSL_CIPHER *cipher"
-.Ft int
-.Fn SSL_CIPHER_get_digest_nid "const SSL_CIPHER *cipher"
-.Ft "const EVP_MD *"
-.Fn SSL_CIPHER_get_handshake_digest "const SSL_CIPHER *cipher"
-.Ft int
-.Fn SSL_CIPHER_get_kx_nid "const SSL_CIPHER *cipher"
-.Ft int
-.Fn SSL_CIPHER_get_auth_nid "const SSL_CIPHER *cipher"
-.Ft int
-.Fn SSL_CIPHER_is_aead "const SSL_CIPHER *cipher"
-.Ft const SSL_CIPHER *
-.Fn SSL_CIPHER_find "SSL *ssl" "const unsigned char *ptr"
-.Ft unsigned long
-.Fn SSL_CIPHER_get_id "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 .
-.Pp
-.Fn SSL_CIPHER_get_bits
-returns the number of secret bits used for
-.Fa cipher .
-If
-.Fa alg_bits
-is not
-.Dv NULL ,
-the number of bits processed by the chosen algorithm is stored into it.
-.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 TLSv1/SSLv3 .
-In some cases it should possibly return
-.Qq TLSv1.2
-but the function does not; use
-.Fn SSL_CIPHER_description
-instead.
-.Pp
-.Fn SSL_CIPHER_get_cipher_nid
-returns the cipher NID corresponding to the
-.Fa cipher .
-If there is no cipher (e.g. for cipher suites with no encryption), then
-.Dv NID_undef
-is returned.
-.Pp
-.Fn SSL_CIPHER_get_digest_nid
-returns the digest NID corresponding to the MAC used by the
-.Fa cipher
-during record encryption/decryption.
-If there is no digest (e.g. for AEAD cipher suites), then
-.Dv NID_undef
-is returned.
-.Pp
-.Fn SSL_CIPHER_get_handshake_digest
-returns the
-.Vt EVP_MD
-object representing the digest used during a TLS handshake with the cipher
-.Fa c ,
-which may be different to the digest used in the message authentication code
-for encrypted records.
-.Pp
-.Fn SSL_CIPHER_get_kx_nid
-returns the key exchange NID corresponding to the method used by the
-.Fa cipher .
-If there is no key exchange, then
-.Dv NID_undef
-is returned.
-Examples of possible return values include
-.Dv NID_kx_rsa ,
-.Dv NID_kx_dhe ,
-and
-.Dv NID_kx_ecdhe .
-.Pp
-.Fn SSL_CIPHER_get_auth_nid
-returns the authentication NID corresponding to the method used by the
-.Fa cipher .
-If there is no authentication,
-.Dv NID_undef
-is returned.
-Examples of possible return values include
-.Dv NID_auth_rsa
-and
-.Dv NID_auth_ecdsa .
-.Pp
-.Fn SSL_CIPHER_is_aead
-returns 1 if the
-.Fa cipher
-is AEAD (e.g. GCM or ChaCha20/Poly1305), or 0 if it is not AEAD.
-.Pp
-.Fn SSL_CIPHER_find
-returns a pointer to a
-.Vt SSL_CIPHER
-structure which has the cipher ID specified in
-.Fa ptr .
-The
-.Fa ptr
-parameter is an array of length two which stores the two-byte
-TLS cipher ID (as allocated by IANA) in network byte order.
-.Fa SSL_CIPHER_find
-returns
-.Dv NULL
-if an error occurs or the indicated cipher is not found.
-.Pp
-.Fn SSL_CIPHER_get_id
-returns the ID of the given
-.Fa cipher ,
-which must not be
-.Dv NULL .
-The ID here is an OpenSSL-specific concept, which stores a prefix
-of 0x0300 in the higher two bytes and the IANA-specified cipher
-suite ID in the lower two bytes.
-For instance, TLS_RSA_WITH_NULL_MD5 has IANA ID "0x00, 0x01", so
-.Fn SSL_CIPHER_get_id
-returns 0x03000001.
-.Pp
-.Fn SSL_CIPHER_description
-copies a textual description of
-.Fa cipher
-into the buffer
-.Fa buf ,
-which must be at least
-.Fa size
-bytes long.
-The
-.Fa cipher
-argument must not be a
-.Dv NULL
-pointer.
-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 to hold the description, a pointer to the static string
-.Qq Buffer too small
-is returned.
-If memory allocation fails, which can happen even if a
-.Fa buf
-of sufficient size is provided, a pointer to the static string
-.Qq OPENSSL_malloc Error
-is returned and the content of
-.Fa buf
-remains unchanged.
-.Pp
-The string returned by
-.Fn SSL_CIPHER_description
-consists of several fields separated by whitespace:
-.Bl -tag -width Ds
-.It Aq Ar ciphername
-Textual representation of the cipher name.
-.It Aq Ar protocol version
-Protocol version:
-.Sy SSLv3 ,
-.Sy TLSv1.2 ,
-or
-.Sy TLSv1.3 .
-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:
-.Sy DH ,
-.Sy ECDH ,
-.Sy GOST ,
-.Sy RSA ,
-or
-.Sy TLSv1.3 .
-.It Au= Ns Aq Ar authentication
-Authentication method:
-.Sy ECDSA ,
-.Sy GOST01 ,
-.Sy RSA ,
-.Sy TLSv1.3 ,
-or
-.Sy None .
-.Sy None
-is the representation of anonymous ciphers.
-.It Enc= Ns Aq Ar symmetric encryption method
-Encryption method with number of secret bits:
-.Sy 3DES(168) ,
-.Sy RC4(128) ,
-.Sy AES(128) ,
-.Sy AES(256) ,
-.Sy AESGCM(128) ,
-.Sy AESGCM(256) ,
-.Sy Camellia(128) ,
-.Sy Camellia(256) ,
-.Sy ChaCha20-Poly1305 ,
-.Sy GOST-28178-89-CNT ,
-or
-.Sy None .
-.It Mac= Ns Aq Ar message authentication code
-Message digest:
-.Sy MD5 ,
-.Sy SHA1 ,
-.Sy SHA256 ,
-.Sy SHA384 ,
-.Sy AEAD ,
-.Sy GOST94 ,
-.Sy GOST89IMIT ,
-or
-.Sy STREEBOG256 .
-.El
-.Sh RETURN VALUES
-.Fn SSL_CIPHER_get_name
-returns an internal pointer to a NUL-terminated string.
-.Fn SSL_CIPHER_get_version
-returns a pointer to a static NUL-terminated string.
-If
-.Fa cipher
-is a
-.Dv NULL
-pointer, both functions return a pointer to the static string
-.Qq Pq NONE .
-.Pp
-.Fn SSL_CIPHER_get_bits
-returns a positive integer representing the number of secret bits
-or 0 if
-.Fa cipher
-is a
-.Dv NULL
-pointer.
-.Pp
-.Fn SSL_CIPHER_get_cipher_nid ,
-.Fn SSL_CIPHER_get_digest_nid ,
-.Fn SSL_CIPHER_get_kx_nid ,
-and
-.Fn SSL_CIPHER_get_auth_nid
-return an NID constant or
-.Dv NID_undef
-if an error occurred.
-.Fn SSL_CIPHER_get_handshake_digest
-returns a valid
-.Vt EVP_MD
-object or
-.Dv NULL
-if an error occurred.
-.Pp
-.Fn SSL_CIPHER_is_aead
-returns 1 if the
-.Fa cipher
-is AEAD or 0 otherwise.
-.Pp
-.Fn SSL_CIPHER_find
-returns a pointer to a valid
-.Vt SSL_CIPHER
-structure or
-.Dv NULL
-if an error occurred.
-.Pp
-.Fn SSL_CIPHER_get_id
-returns a 32-bit unsigned integer.
-.Pp
-.Fn SSL_CIPHER_description
-returns
-.Fa buf
-or a newly allocated string on success or a pointer to a static
-string on error.
-.Sh EXAMPLES
-An example for the output of
-.Fn SSL_CIPHER_description :
-.Bd -literal
-ECDHE-RSA-AES256-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
-.Ed
-.Pp
-A complete list can be retrieved by invoking the following command:
-.Pp
-.Dl $ openssl ciphers -v ALL:COMPLEMENTOFALL
-.Sh SEE ALSO
-.Xr openssl 1 ,
-.Xr ssl 3 ,
-.Xr SSL_get_ciphers 3 ,
-.Xr SSL_get_current_cipher 3
-.Sh HISTORY
-.Fn SSL_CIPHER_description
-first appeared in SSLeay 0.8.0.
-.Fn SSL_CIPHER_get_name ,
-.Fn SSL_CIPHER_get_bits ,
-and
-.Fn SSL_CIPHER_get_version
-first appeared in SSLeay 0.8.1.
-These functions have been available since
-.Ox 2.4 .
-.Pp
-.Fn SSL_CIPHER_get_id
-first appeared in OpenSSL 1.0.1 and has been available since
-.Ox 5.3 .
-.Pp
-.Fn SSL_CIPHER_get_cipher_nid ,
-.Fn SSL_CIPHER_get_digest_nid ,
-.Fn SSL_CIPHER_get_kx_nid ,
-.Fn SSL_CIPHER_get_auth_nid ,
-and
-.Fn SSL_CIPHER_is_aead
-first appeared in OpenSSL 1.1.0 and have been available since
-.Ox 6.3 .
-.Fn SSL_CIPHER_find
-first appeared in OpenSSL 1.1.0 and has been available since
-.Ox 7.0 .
-.Fn SSL_CIPHER_get_handshake_digest
-first appeared in OpenSSL 1.1.1 and has been available since
-.Ox 7.6 .
-.Sh BUGS
-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.