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-.\" $OpenBSD: SSL_get_client_random.3,v 1.2 2018/03/24 00:55:37 schwarze Exp $
-.\" full merge up to: OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100
-.\"
-.\" This file was written by Nick Mathewson <nickm@torproject.org>
-.\" Copyright (c) 2015 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: March 24 2018 $
-.Dt SSL_GET_CLIENT_RANDOM 3
-.Os
-.Sh NAME
-.Nm SSL_get_client_random ,
-.Nm SSL_get_server_random ,
-.Nm SSL_SESSION_get_master_key
-.Nd get internal TLS handshake random values and master key
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft size_t
-.Fo SSL_get_client_random
-.Fa "const SSL *ssl"
-.Fa "unsigned char *out"
-.Fa "size_t outlen"
-.Fc
-.Ft size_t
-.Fo SSL_get_server_random
-.Fa "const SSL *ssl"
-.Fa "unsigned char *out"
-.Fa "size_t outlen"
-.Fc
-.Ft size_t
-.Fo SSL_SESSION_get_master_key
-.Fa "const SSL_SESSION *session"
-.Fa "unsigned char *out"
-.Fa "size_t outlen"
-.Fc
-.Sh DESCRIPTION
-.Fn SSL_get_client_random
-extracts the random value that was sent from the client to the server
-during the initial TLS handshake.
-It copies at most
-.Fa outlen
-bytes of this value into the buffer
-.Fa out .
-If
-.Fa outlen
-is zero, nothing is copied.
-.Pp
-.Fn SSL_get_server_random
-behaves the same, but extracts the random value that was sent
-from the server to the client during the initial TLS handshake.
-.Pp
-.Fn SSL_SESSION_get_master_key
-behaves the same, but extracts the master secret used to guarantee the
-security of the TLS session.
-The security of the TLS session depends on keeping the master key
-secret: do not expose it, or any information about it, to anybody.
-To calculate another secret value that depends on the master secret,
-use
-.Xr SSL_export_keying_material 3
-instead.
-.Pp
-All these functions expose internal values from the TLS handshake,
-for use in low-level protocols.
-Avoid using them unless implementing a feature
-that requires access to the internal protocol details.
-.Pp
-Despite the names of
-.Fn SSL_get_client_random
-and
-.Fn SSL_get_server_random ,
-they are not random number generators.
-Instead, they return the mostly-random values that were already
-generated and used in the TLS protocol.
-.Pp
-In current versions of the TLS protocols,
-the length of client_random and server_random is always
-.Dv SSL3_RANDOM_SIZE
-bytes.
-Support for other
-.Fa outlen
-arguments is provided for the unlikely event that a future
-version or variant of TLS uses some other length.
-.Pp
-Finally, though the client_random and server_random values are called
-.Dq random ,
-many TLS implementations generate four bytes of those values
-based on their view of the current time.
-.Sh RETURN VALUES
-If
-.Fa outlen
-is greater than 0, these functions return the number of bytes
-actually copied, which is less than or equal to
-.Fa outlen .
-If
-.Fa outlen
-is 0, these functions return the maximum number of bytes they would
-copy \(em that is, the length of the underlying field.
-.Sh SEE ALSO
-.Xr ssl 3 ,
-.Xr SSL_export_keying_material 3 ,
-.Xr SSL_SESSION_get_id 3 ,
-.Xr SSL_SESSION_get_time 3 ,
-.Xr SSL_SESSION_new 3
-.Sh HISTORY
-These functions first appeared in OpenSSL 1.1.0
-and have been available since
-.Ox 6.3 .