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.\" ========================================================================
.\"
.IX Title "SSL_library_init 3"
.TH SSL_library_init 3 2019-12-20 1.0.2u OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
SSL_library_init, OpenSSL_add_ssl_algorithms, SSLeay_add_ssl_algorithms
\&\- initialize SSL library by registering algorithms
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #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()
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBSSL_library_init()\fR registers the available SSL/TLS ciphers and digests.
.PP
\&\fBOpenSSL_add_ssl_algorithms()\fR and \fBSSLeay_add_ssl_algorithms()\fR are synonyms
for \fBSSL_library_init()\fR.
.SH NOTES
.IX Header "NOTES"
\&\fBSSL_library_init()\fR must be called before any other action takes place.
\&\fBSSL_library_init()\fR is not reentrant.
.SH WARNING
.IX Header "WARNING"
\&\fBSSL_library_init()\fR adds ciphers and digests used directly and indirectly by
SSL/TLS.
.SH EXAMPLES
.IX Header "EXAMPLES"
A typical TLS/SSL application will start with the library initialization,
and provide readable error messages.
.PP
.Vb 2
\& SSL_load_error_strings();                /* readable error messages */
\& SSL_library_init();                      /* initialize library */
.Ve
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_library_init()\fR always returns "1", so it is safe to discard the return
value.
.SH NOTES
.IX Header "NOTES"
OpenSSL 0.9.8o and 1.0.0a and later added SHA2 algorithms to \fBSSL_library_init()\fR.
Applications which need to use SHA2 in earlier versions of OpenSSL should call
\&\fBOpenSSL_add_all_algorithms()\fR as well.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3), \fBSSL_load_error_strings\fR\|(3),
\&\fBRAND_add\fR\|(3)