libressl-SSL_library_init(3)

libressl-SSL_library_init3

Initialize ssl library by registering algorithms

Usage

SSL Library (libssl, -lssl) libcrypto

#include <openssl/ssl.h>

int

SSL_library_init(void);

int

OpenSSL_add_ssl_algorithms(void);

int

SSLeay_add_ssl_algorithms(void);

Overview

These functions are deprecated. It is never useful for any application program to call any of them explicitly. The library automatically calls them internally whenever needed.

SSL_library_init() registers the available ciphers and digests which are used directly or indirectly by TLS.

OpenSSL_add_ssl_algorithms() and SSLeay_add_ssl_algorithms() are synonyms for SSL_library_init() and are implemented as macros.

Return values

SSL_library_init() always returns 1.

History

SSLeay_add_ssl_algorithms() first appeared in SSLeay 0.8.0 and has been available since OpenBSD 2.4.

SSL_library_init() first appeared in OpenSSL 0.9.2b and has been available since OpenBSD 2.6.

OpenSSL_add_ssl_algorithms() first appeared in OpenSSL 0.9.5 and has been available since OpenBSD 2.7.

From libressl 4.4.0-1 in Arch Linux 2026-11-01. Parsed by carta from the page's mdoc source.