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SSL_SESSION_get0_id_context, SSL_SESSION_set1_id_context
get and set the SSL ID context associated with a session

#include <openssl/ssl.h>
const unsigned char *
SSL_SESSION_get0_id_context(const SSL_SESSION *s, unsigned int *len);
SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx, unsigned int sid_ctx_len);

SSL_SESSION_get0_id_context() returns the ID context associated with s. The length of the ID context in bytes is written to *len if len is not NULL.
SSL_SESSION_set1_id_context() takes a copy of the provided ID context given in sid_ctx and associates it with the session s. The length of the ID context is given by sid_ctx_len which must not exceed SSL_MAX_SID_CTX_LENGTH bytes.

SSL_SESSION_get0_id_context() returns an internal pointer to an object maintained within s that should not be freed by the caller.
SSL_SESSION_set1_id_context() returns 1 on success or 0 on error.

ssl(3), SSL_CTX_set_session_id_context(3), SSL_get_session(3), SSL_SESSION_new(3)

SSL_SESSION_set1_id_context() first appeared in OpenSSL 1.0.1 and has been available since OpenBSD 5.3.
SSL_SESSION_get0_id_context() first appeared in OpenSSL 1.1.0 and has been available since OpenBSD 6.3.
March 24, 2018 OpenBSD-current