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-.\"     $OpenBSD: SSL_export_keying_material.3,v 1.3 2019/06/12 09:36:30 schwarze Exp $
-.\"     OpenSSL a599574b Jun 28 17:18:27 2017 +0100
-.\"     OpenSSL 23cec1f4 Jun 21 13:55:02 2017 +0100
-.\"
-.\" This file was written by Matt Caswell <matt@openssl.org>.
-.\" Copyright (c) 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,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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-.\"
-.Dd $Mdocdate: June 12 2019 $
-.Dt SSL_EXPORT_KEYING_MATERIAL 3
-.Os
-.Sh NAME
-.Nm SSL_export_keying_material
-.Nd obtain keying material for application use
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft int
-.Fo SSL_export_keying_material
-.Fa "SSL *s"
-.Fa "unsigned char *out"
-.Fa "size_t olen"
-.Fa "const char *label"
-.Fa "size_t llen"
-.Fa "const unsigned char *context"
-.Fa "size_t contextlen"
-.Fa "int use_context"
-.Fc
-.Sh DESCRIPTION
-During the creation of a TLS or DTLS connection,
-shared keying material is established between the two endpoints.
-The function
-.Fn SSL_export_keying_material
-enables an application to use some of this keying material
-for its own purposes in accordance with RFC 5705.
-.Pp
-An application may need to securely establish the context
-within which this keying material will be used.
-For example, this may include identifiers for the application session,
-application algorithms or parameters, or the lifetime of the context.
-The context value is left to the application but must be the same on
-both sides of the communication.
-.Pp
-For a given SSL connection
-.Fa s ,
-.Fa olen
-bytes of data will be written to
-.Fa out .
-The application specific context should be supplied
-in the location pointed to by
-.Fa context
-and should be
-.Fa contextlen
-bytes long.
-Provision of a context is optional.
-If the context should be omitted entirely, then
-.Fa use_context
-should be set to 0.
-Otherwise it should be any other value.
-If
-.Fa use_context
-is 0, then the values of
-.Fa context
-and
-.Fa contextlen
-are ignored.
-.Pp
-In TLSv1.2 and below, a zero length context is treated differently
-from no context at all, and will result in different keying material
-being returned.
-.Pp
-An application specific label should be provided in the location pointed
-to by
-.Fa label
-and should be
-.Fa llen
-bytes long.
-Typically this will be a value from the
-.Lk https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#exporter-labels "IANA Exporter Label Registry" .
-.Pp
-Alternatively, labels beginning with "EXPERIMENTAL" are permitted by the
-standard to be used without registration.
-.Sh RETURN VALUES
-.Fn SSL_export_keying_material
-returns 1 on success or 0 or -1 on failure.
-.Sh SEE ALSO
-.Xr ssl 3
-.Sh HISTORY
-.Fn SSL_export_keying_material
-first appeared in OpenSSL 1.0.1 and has been available since
-.Ox 5.3 .