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SSL_library_init(3)                 OpenSSL                SSL_library_init(3)

NAME
       SSL_library_init, OpenSSL_add_ssl_algorithms, SSLeay_add_ssl_algorithms
       - initialize SSL library by registering algorithms

SYNOPSIS
        #include <openssl/ssl.h>

        int SSL_library_init(void);
        #define OpenSSL_add_ssl_algorithms()    SSL_library_init()
        #define SSLeay_add_ssl_algorithms()     SSL_library_init()

DESCRIPTION
       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().

NOTES
       SSL_library_init() must be called before any other action takes place.
       SSL_library_init() is not reentrant.

WARNING
       SSL_library_init() adds ciphers and digests used directly and
       indirectly by SSL/TLS.

EXAMPLES
       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 */

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

NOTES
       OpenSSL 0.9.8o and 1.0.0a and later added SHA2 algorithms to
       SSL_library_init().  Applications which need to use SHA2 in earlier
       versions of OpenSSL should call OpenSSL_add_all_algorithms() as well.

SEE ALSO
       ssl(3), SSL_load_error_strings(3), RAND_add(3)

1.0.2h                            2016-05-03               SSL_library_init(3)