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+SSL_export_keying_material - obtain keying material for application use
+ #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);
+During the creation of a TLS or DTLS connection shared keying material is
+established between the two endpoints. The function SSL_export_keying_material()
+enables an application to use some of this keying material for its own purposes
+in accordance with RFC5705.
+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.
+For a given SSL connection B<s>, B<olen> bytes of data will be written to
+B<out>. The application specific context should be supplied in the location
+pointed to by B<context> and should be B<contextlen> bytes long. Provision of
+a context is optional. If the context should be omitted entirely then
+B<use_context> should be set to 0. Otherwise it should be any other value. If
+B<use_context> is 0 then the values of B<context> and B<contextlen> 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.
+An application specific label should be provided in the location pointed to by
+B<label> and should be B<llen> bytes long. Typically this will be a value from
+the IANA Exporter Label Registry
+Alternatively labels beginning with "EXPERIMENTAL" are permitted by the standard
+to be used without registration.
+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.
+=head1 RETURN VALUES
+SSL_export_keying_material() returns 0 or -1 on failure or 1 on success.
+Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at