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.\" ========================================================================
.\"
.IX Title "SSL_CTX_SET_SSL_VERSION 3SSL"
.TH SSL_CTX_SET_SSL_VERSION 3SSL "2023-10-23" "3.0.11" "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_CTX_set_ssl_version, SSL_CTX_get_ssl_method, SSL_set_ssl_method, SSL_get_ssl_method
\&\- choose a new TLS/SSL method
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *method);
\& const SSL_METHOD *SSL_CTX_get_ssl_method(const SSL_CTX *ctx);
\&
\& int SSL_set_ssl_method(SSL *s, const SSL_METHOD *method);
\& const SSL_METHOD *SSL_get_ssl_method(const SSL *ssl);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_set_ssl_version()\fR sets a new default \s-1TLS/SSL\s0 \fBmethod\fR for \s-1SSL\s0 objects
newly created from this \fBctx\fR.  Most of the configuration attached to the
\&\s-1SSL_CTX\s0 object is retained, with the exception of the configured \s-1TLS\s0 ciphers,
which are reset to the default values.  \s-1SSL\s0 objects already created from this
\&\s-1SSL_CTX\s0 with \fBSSL_new\fR\|(3) are not affected, except when \fBSSL_clear\fR\|(3) is
being called, as described below.
.PP
\&\fBSSL_CTX_get_ssl_method()\fR returns the \s-1SSL_METHOD\s0 which was used to construct the
\&\s-1SSL_CTX.\s0
.PP
\&\fBSSL_set_ssl_method()\fR sets a new \s-1TLS/SSL\s0 \fBmethod\fR for a particular \fBssl\fR
object. It may be reset, when \fBSSL_clear()\fR is called.
.PP
\&\fBSSL_get_ssl_method()\fR returns a pointer to the \s-1TLS/SSL\s0 method
set in \fBssl\fR.
.SH "NOTES"
.IX Header "NOTES"
The available \fBmethod\fR choices are described in
\&\fBSSL_CTX_new\fR\|(3).
.PP
When \fBSSL_clear\fR\|(3) is called and no session is connected to
an \s-1SSL\s0 object, the method of the \s-1SSL\s0 object is reset to the method currently
set in the corresponding \s-1SSL_CTX\s0 object.
.PP
\&\fBSSL_CTX_set_version()\fR has unusual semantics and no clear use case;
it would usually be preferable to create a new \s-1SSL_CTX\s0 object than to
try to reuse an existing one in this fashion.  Its usage is considered
deprecated.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur for \fBSSL_CTX_set_ssl_version()\fR
and \fBSSL_set_ssl_method()\fR:
.IP "0" 4
The new choice failed, check the error stack to find out the reason.
.IP "1" 4
.IX Item "1"
The operation succeeded.
.PP
\&\fBSSL_CTX_get_ssl_method()\fR and \fBSSL_get_ssl_method()\fR always return non-NULL
pointers.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBSSL_CTX_new\fR\|(3), \fBSSL_new\fR\|(3),
\&\fBSSL_clear\fR\|(3), \fBssl\fR\|(7),
\&\fBSSL_set_connect_state\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBSSL_CTX_set_ssl_version()\fR was deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.