/usr/man/cat.3/SSL_library_init.3

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)

1.0.2t               Last change: 2019-09-10                    1

See also OpenSSL_add_ssl_algorithms(3)
See also SSLeay_add_ssl_algorithms(3)