SSL_SESSION_get0_cipher, SSL_SESSION_set_cipher - set and retrieve the SSL cipher associated with a

       Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                      SSL_SESSION_GET0_CIPHER(3SSL)

SSL_SESSION_get0_cipher() retrieves the cipher that was used by the connection when the session was
       created, or NULL if it cannot be determined.

       The value returned is a pointer to an object maintained within s and should not be released.

       SSL_SESSION_set_cipher() can be used to set the ciphersuite associated with the SSL_SESSION s to cipher.
       For example, this could be used to set up a session based PSK (see
       SSL_CTX_set_psk_use_session_callback(3)).

       The SSL_SESSION_get0_cipher() function was added in OpenSSL 1.1.0.  The SSL_SESSION_set_cipher() function
       was added in OpenSSL 1.1.1.

       SSL_SESSION_get0_cipher, SSL_SESSION_set_cipher - set and retrieve the SSL cipher associated with a
       session

SSL_SESSION_get0_cipher() returns the SSL_CIPHER associated with the SSL_SESSION or NULL if it cannot be
       determined.

       SSL_SESSION_set_cipher() returns 1 on success or 0 on failure.

ssl(7), d2i_SSL_SESSION(3), SSL_SESSION_get_time(3), SSL_SESSION_get0_hostname(3), SSL_SESSION_free(3),
       SSL_CTX_set_psk_use_session_callback(3)

        #include <openssl/ssl.h>

        const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSION *s);
        int SSL_SESSION_set_cipher(SSL_SESSION *s, const SSL_CIPHER *cipher);