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SSL_LIBRARY_INIT(3) Library Functions Manual SSL_LIBRARY_INIT(3)

SSL_library_init, OpenSSL_add_ssl_algorithms, SSLeay_add_ssl_algorithms
initialize SSL library by registering algorithms

#include <openssl/ssl.h>

SSL_library_init() registers the available SSL/TLS ciphers and digests.
OpenSSL_add_ssl_algorithms() and SSLeay_add_ssl_algorithms() are synonyms for SSL_library_init() and are implemented as macros.
SSL_library_init() must be called before any other action takes place. SSL_library_init() is not reentrant.
SSL_library_init() adds ciphers and digests used directly and indirectly by SSL/TLS.

SSL_library_init() always returns 1, so it is safe to discard the return value.

A typical TLS/SSL application will start with the library initialization, and provide readable error messages.
SSL_load_error_strings();                /* readable error messages */ 
SSL_library_init();                      /* initialize library */

RAND_add(3), ssl(3), SSL_load_error_strings(3)

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.
March 27, 2018 OpenBSD-current