SSL_SESSION_get0_id_context.3ssl man page
SSL_SESSION_get0_id_context — get 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_get0_id_context() returns the ID context associated with the SSL/TLS session s. The length of the ID context is written to *len if len is not NULL.
The value returned is a pointer to an object maintained within s and should not be released.
SSL_SESSION_get0_id_context() was first added to OpenSSL 1.1.0
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