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=pod

=head1 NAME

SSL_CTX_get0_param, SSL_get0_param, SSL_CTX_set1_param, SSL_set1_param -
get and set verification parameters

=head1 SYNOPSIS

 #include <openssl/ssl.h>

 X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx)
 X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl)
 int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm)
 int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm)

=head1 DESCRIPTION

SSL_CTX_get0_param() and SSL_get0_param() retrieve an internal pointer to
the verification parameters for B<ctx> or B<ssl> respectively. The returned
pointer must not be freed by the calling application.

SSL_CTX_set1_param() and SSL_set1_param() set the verification parameters
to B<vpm> for B<ctx> or B<ssl>.

=head1 NOTES

Typically parameters are retrieved from an B<SSL_CTX> or B<SSL> structure
using SSL_CTX_get0_param() or SSL_get0_param() and an application modifies
them to suit its needs: for example to add a hostname check.

=head1 RETURN VALUES

SSL_CTX_get0_param() and SSL_get0_param() return a pointer to an
B<X509_VERIFY_PARAM> structure.

SSL_CTX_set1_param() and SSL_set1_param() return 1 for success and 0
for failure.

=head1 EXAMPLES

Check hostname matches "www.foo.com" in peer certificate:

 X509_VERIFY_PARAM *vpm = SSL_get0_param(ssl);
 X509_VERIFY_PARAM_set1_host(vpm, "www.foo.com", 0);

=head1 SEE ALSO

L<X509_VERIFY_PARAM_set_flags(3)>

=head1 HISTORY

These functions were added in OpenSSL 1.0.2.

=head1 COPYRIGHT

Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut