SSL_get_extms_support - extended master secret support

#include <openssl/ssl.h>

int SSL_get_extms_support(SSL *ssl);

SSL_get_extms_support() indicates whether the current session used extended master secret.

This function is implemented as a macro.

SSL_get_extms_support() returns 1 if the current session used extended master secret, 0 if it did not and -1 if a handshake is currently in progress i.e. it is not possible to determine if extended master secret was used.


Copyright 2015-2016 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

2021-03-25 1.1.1k