=pod

=head1 NAME

DSA_dup_DH - create a DH structure out of DSA structure

=head1 SYNOPSIS

 #include <openssl/dsa.h>

 DH *DSA_dup_DH(const DSA *r);

=head1 DESCRIPTION

DSA_dup_DH() duplicates DSA parameters/keys as DH parameters/keys. q
is lost during that conversion, but the resulting DH parameters
contain its length.

=head1 RETURN VALUES

DSA_dup_DH() returns the new B<DH> structure, and NULL on error. The
error codes can be obtained by L<ERR_get_error(3)>.

=head1 NOTE

Be careful to avoid small subgroup attacks when using this.

=head1 SEE ALSO

L<DH_new(3)>, L<DSA_new(3)>, L<ERR_get_error(3)>

=head1 COPYRIGHT

Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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