SSL_library_init.3ssl - Man Page

initialize SSL library by registering algorithms


 #include <openssl/ssl.h>

 int SSL_library_init(void);

 int OpenSSL_add_ssl_algorithms(void);


SSL_library_init() registers the available SSL/TLS ciphers and digests.

OpenSSL_add_ssl_algorithms() is a synonym for SSL_library_init() and is implemented as a macro.


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.

Return Values

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

See Also

ssl(7), RAND_add(3)


The SSL_library_init() and OpenSSL_add_ssl_algorithms() functions were deprecated in OpenSSL 1.1.0 by OPENSSL_init_ssl().

Referenced By

The man page OpenSSL_add_ssl_algorithms.3ssl(3) is an alias of SSL_library_init.3ssl(3).

2021-09-20 1.1.1l OpenSSL