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IABSD.fr/src/lib/libssl/man/SSL_get_ciphers.3
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.\" $OpenBSD: SSL_get_ciphers.3,v 1.7 2019/01/22 01:18:24 tb Exp $ .\" full merge up to: OpenSSL c3e64028 Mar 30 11:50:14 2005 +0000 .\" selective merge up to: OpenSSL 83cf7abf May 29 13:07:08 2018 +0100 .\" .\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>, .\" Nick Mathewson <nickm@torproject.org>, and Kazuki Yamaguchi <k@rhe.jp>. .\" Copyright (c) 2000, 2005, 2015, 2016 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: January 22 2019 $ .Dt SSL_GET_CIPHERS 3 .Os .Sh NAME .Nm SSL_get_ciphers , .Nm SSL_CTX_get_ciphers , .Nm SSL_get1_supported_ciphers , .Nm SSL_get_client_ciphers , .Nm SSL_get_cipher_list .Nd get list of available SSL_CIPHERs .Sh SYNOPSIS .In openssl/ssl.h .Ft STACK_OF(SSL_CIPHER) * .Fn SSL_get_ciphers "const SSL *ssl" .Ft STACK_OF(SSL_CIPHER) * .Fn SSL_CTX_get_ciphers "const SSL_CTX *ctx" .Ft STACK_OF(SSL_CIPHER) * .Fn SSL_get1_supported_ciphers "SSL *ssl" .Ft STACK_OF(SSL_CIPHER) * .Fn SSL_get_client_ciphers "const SSL *ssl" .Ft const char * .Fn SSL_get_cipher_list "const SSL *ssl" "int priority" .Sh DESCRIPTION .Fn SSL_get_ciphers returns the stack of available .Vt SSL_CIPHER Ns s for .Fa ssl , sorted by preference. If .Fa ssl is .Dv NULL or no ciphers are available, .Dv NULL is returned. .Pp .Fn SSL_CTX_get_ciphers returns the stack of available .Vt SSL_CIPHER Ns s for .Fa ctx . .Pp .Fn SSL_get1_supported_ciphers returns the stack of enabled .Vt SSL_CIPHER Ns s for .Fa ssl as it would be sent in a ClientHello, sorted by preference. The list depends on settings like the cipher list, the supported protocol versions, the security level, and the enabled signature algorithms. The list of ciphers that would be sent in a ClientHello can differ from the list of ciphers that would be acceptable when acting as a server. For example, additional ciphers may be usable by a server if there is a gap in the list of supported protocols, and some ciphers may not be usable by a server if there is not a suitable certificate configured. If .Fa ssl is .Dv NULL or no ciphers are available, .Dv NULL is returned. .Pp .Fn SSL_get_client_ciphers returns the stack of available .Vt SSL_CIPHER Ns s matching the list received from the client on .Fa ssl . If .Fa ssl is .Dv NULL , no ciphers are available, or .Fa ssl is not operating in server mode, .Dv NULL is returned. .Pp .Fn SSL_get_ciphers , .Fn SSL_CTX_get_ciphers , and .Fn SSL_get_client_ciphers return pointers to internal cipher stacks, which will be freed later on when the .Vt SSL or .Vt SSL_CTX object is freed. Therefore, the calling code must not free the return value itself. .Pp The details of the ciphers obtained by .Fn SSL_get_ciphers , .Fn SSL_CTX_get_ciphers , .Fn SSL_get1_supported_ciphers , and .Fn SSL_get_client_ciphers can be obtained using the .Xr SSL_CIPHER_get_name 3 family of functions. .Pp .Fn SSL_get_cipher_list returns a pointer to the name of the .Vt SSL_CIPHER listed for .Fa ssl with .Fa priority . If .Fa ssl is .Dv NULL , no ciphers are available, or there are fewer ciphers than .Fa priority available, .Dv NULL is returned. .Pp Call .Fn SSL_get_cipher_list with .Fa priority starting from 0 to obtain the sorted list of available ciphers, until .Dv NULL is returned. .Sh SEE ALSO .Xr ssl 3 , .Xr SSL_CIPHER_get_name 3 , .Xr SSL_CTX_set_cipher_list 3 .Sh HISTORY .Fn SSL_get_cipher_list first appeared in SSLeay 0.5.2. .Fn SSL_get_ciphers first appeared in SSLeay 0.8.0. Both functions have been available since .Ox 2.4 . .Pp .Fn SSL_CTX_get_ciphers first appeared in OpenSSL 1.1.0 and has been available since .Ox 6.3 . .Pp .Fn SSL_get1_supported_ciphers and .Fn SSL_get_client_ciphers first appeared in OpenSSL 1.1.0 and has been available since .Ox 6.5 .