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.\" ========================================================================
.\"
.IX Title "SSL_export_keying_material 3"
.TH SSL_export_keying_material 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_export_keying_material \- obtain keying material for application use
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
\&                                const char *label, size_t llen,
\&                                const unsigned char *context,
\&                                size_t contextlen, int use_context);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
During the creation of a \s-1TLS\s0 or \s-1DTLS\s0 connection shared keying material is
established between the two endpoints. The function \fBSSL_export_keying_material()\fR
enables an application to use some of this keying material for its own purposes
in accordance with \s-1RFC5705.\s0
.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 \s-1SSL\s0 connection \fBs\fR, \fBolen\fR bytes of data will be written to
\&\fBout\fR. The application specific context should be supplied in the location
pointed to by \fBcontext\fR and should be \fBcontextlen\fR bytes long. Provision of
a context is optional. If the context should be omitted entirely then
\&\fBuse_context\fR should be set to 0. Otherwise it should be any other value. If
\&\fBuse_context\fR is 0 then the values of \fBcontext\fR and \fBcontextlen\fR are ignored.
Note that a zero length context is treated differently to 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
\&\fBlabel\fR and should be \fBllen\fR bytes long. Typically this will be a value from
the \s-1IANA\s0 Exporter Label Registry
(<https://www.iana.org/assignments/tls\-parameters/tls\-parameters.xhtml#exporter\-labels>).
Alternatively labels beginning with \*(L"\s-1EXPERIMENTAL\*(R"\s0 are permitted by the standard
to be used without registration.
.PP
Note that this function is only defined for TLSv1.0 and above, and DTLSv1.0 and
above. Attempting to use it in SSLv3 will result in an error.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_export_keying_material()\fR returns 0 or \-1 on failure or 1 on success.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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