#include <openssl/ssl.h> int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx, unsigned int sid_ctx_len); int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx, unsigned int sid_ctx_len);
SSL_set_session_id_context() sets the context sid_ctx of length sid_ctx_len within which a session can be reused for the ssl object.
The session id context becomes part of the session. The session id context is set by the SSL/TLS server. The SSL_CTX_set_session_id_context() and SSL_set_session_id_context() functions are therefore only useful on the server side.
OpenSSL clients will check the session id context returned by the server when reusing a session.
The maximum length of the sid_ctx is limited to SSL_MAX_SID_CTX_LENGTH.
If a server returns a different session id context to an OpenSSL client when reusing a session, an error will be flagged and the handshake will fail. OpenSSL servers will always return the correct session id context, as an OpenSSL server checks the session id context itself before reusing a session as described above.
- The length sid_ctx_len of the session id context sid_ctx exceeded the maximum allowed length of SSL_MAX_SID_CTX_LENGTH. The error is logged to the error stack.
- The operation succeeded.
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 https://www.openssl.org/source/license.html.