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+.\" $OpenBSD: SSL_get_current_cipher.3,v 1.5 2025/06/08 22:52:00 schwarze Exp $
+.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
+.\"
+.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
+.\" Copyright (c) 2000, 2005, 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: June 8 2025 $
+.Dt SSL_GET_CURRENT_CIPHER 3
+.Os
+.Sh NAME
+.Nm SSL_get_current_cipher ,
+.Nm SSL_get_cipher ,
+.Nm SSL_get_cipher_name ,
+.Nm SSL_get_cipher_bits ,
+.Nm SSL_get_cipher_version
+.Nd get SSL_CIPHER of a connection
+.Sh SYNOPSIS
+.Lb libssl libcrypto
+.In openssl/ssl.h
+.Ft const SSL_CIPHER *
+.Fn SSL_get_current_cipher "const SSL *ssl"
+.Ft const char *
+.Fn SSL_get_cipher "const SSL *ssl"
+.Ft const char *
+.Fn SSL_get_cipher_name "const SSL *ssl"
+.Ft int
+.Fn SSL_get_cipher_bits "const SSL *ssl" "int *np"
+.Ft char *
+.Fn SSL_get_cipher_version "const SSL *ssl"
+.Sh DESCRIPTION
+.Fn SSL_get_current_cipher
+returns a pointer to an
+.Vt SSL_CIPHER
+object containing the description of the actually used cipher of a connection
+established with the
+.Fa ssl
+object.
+See
+.Xr SSL_CIPHER_get_name 3
+for more details.
+.Pp
+.Fn SSL_get_cipher_name
+obtains the name of the currently used cipher.
+.Fn SSL_get_cipher
+is identical to
+.Fn SSL_get_cipher_name .
+.Pp
+.Fn SSL_get_cipher_bits
+obtains the number of secret/algorithm bits used and
+.Fn SSL_get_cipher_version
+returns the protocol name.
+.Pp
+.Fn SSL_get_cipher ,
+.Fn SSL_get_cipher_name ,
+.Fn SSL_get_cipher_bits ,
+and
+.Fn SSL_get_cipher_version
+are implemented as macros.
+.Sh RETURN VALUES
+.Fn SSL_get_current_cipher
+returns the cipher actually used, or
+.Dv NULL
+if no session has been established.
+.Sh SEE ALSO
+.Xr ssl 3 ,
+.Xr SSL_CIPHER_get_name 3
+.Sh HISTORY
+.Fn SSL_get_cipher
+appeared in SSLeay 0.4 or earlier.
+.Fn SSL_get_cipher_bits
+first appeared in SSLeay 0.6.4.
+.Fn SSL_get_cipher_name
+and
+.Fn SSL_get_cipher_version
+first appeared in SSLeay 0.8.0.
+.Fn SSL_get_current_cipher
+first appeared in SSLeay 0.8.1.
+These functions have been available since
+.Ox 2.4 .