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@@ -0,0 +1,69 @@
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+=pod
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+
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+=head1 NAME
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+
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+SSL_set_session_secret_cb, tls_session_secret_cb_fn
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+- set the session secret callback
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+
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+=head1 SYNOPSIS
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+
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+ #include <openssl/ssl.h>
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+
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+ typedef int (*tls_session_secret_cb_fn)(SSL *s, void *secret, int *secret_len,
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+ STACK_OF(SSL_CIPHER) *peer_ciphers,
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+ const SSL_CIPHER **cipher, void *arg);
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+
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+ int SSL_set_session_secret_cb(SSL *s,
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+ tls_session_secret_cb_fn session_secret_cb,
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+ void *arg);
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+
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+=head1 DESCRIPTION
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+
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+SSL_set_session_secret_cb() sets the session secret callback to be used
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+(I<session_secret_cb>), and an optional argument (I<arg>) to be passed to that
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+callback when it is called. This is only useful for an implementation of
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+EAP-FAST (RFC4851). The presence of the callback also modifies the internal
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+OpenSSL TLS state machine to match the modified TLS behaviour as described in
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+RFC4851. Therefore this callback should not be used except when implementing
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+EAP-FAST.
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+
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+The callback is expected to set the master secret to be used by filling in the
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+data pointed to by I<*secret>. The size of the secret buffer is initially
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+available in I<*secret_len> and may be updated by the callback (but must not be
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+larger than the initial value).
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+
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+On the server side the set of ciphersuites offered by the peer is provided in
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+the I<peer_ciphers> stack. Optionally the callback may select the preferred
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+ciphersuite by setting it in I<*cipher>.
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+
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+On the client side the I<peer_ciphers> stack will always be NULL. The callback
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+may specify the preferred cipher in I<*cipher> and this will be associated with
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+the B<SSL_SESSION> - but it does not affect the ciphersuite selected by the
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+server.
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+
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+The callback is also supplied with an additional argument in I<arg> which is the
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+argument that was provided to the original SSL_set_session_secret_cb() call.
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+
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+=head1 RETURN VALUES
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+
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+SSL_set_session_secret_cb() returns 1 on success and 0 on failure.
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+
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+If the callback returns 1 then this indicates it has successfully set the
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+secret. A return value of 0 indicates that the secret has not been set. On the
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+client this will cause an immediate abort of the handshake.
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+
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+=head1 SEE ALSO
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+
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+L<ssl(7)>,
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+L<SSL_get_session(3)>
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+
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+=head1 COPYRIGHT
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+
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+Copyright 2024 The OpenSSL Project Authors. All Rights Reserved.
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+
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+Licensed under the Apache License 2.0 (the "License"). You may not use
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+this file except in compliance with the License. You can obtain a copy
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+in the file LICENSE in the source distribution or at
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+L<https://www.openssl.org/source/license.html>.
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+
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+=cut
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Matt Caswell