SSL_SESSION_set1_id(3ssl)

SSL_SESSION_set1_id3ssl

Get and set the ssl session id

Usage

 #include <openssl/ssl.h>
 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s,
                                         unsigned int *len);
 int SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
                         unsigned int sid_len);

Overview

SSL_SESSION_get_id() returns a pointer to the internal session id value for the session s. The length of the id in bytes is stored in *len. The length may be 0. The caller should not free the returned pointer directly.

SSL_SESSION_set1_id() sets the session ID for the ssl SSL/TLS session to sid of length sid_len.

Return values

SSL_SESSION_get_id() returns a pointer to the session id value. SSL_SESSION_set1_id() returns 1 for success and 0 for failure, for example if the supplied session ID length exceeds SSL_MAX_SSL_SESSION_ID_LENGTH.

Releases

6 releases since Debian 9 (Stretch); the text changed 5 times.

  1. 9
  2. 10
  3. 11
  4. 12
  5. 13
  6. Arch

History

The SSL_SESSION_set1_id() function was added in OpenSSL 1.1.0.

From openssl 3.6.5-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.