1=pod 2 3=head1 NAME 4 5DSA_dup_DH - create a DH structure out of DSA structure 6 7=head1 SYNOPSIS 8 9 #include <openssl/dsa.h> 10 11 DH *DSA_dup_DH(const DSA *r); 12 13=head1 DESCRIPTION 14 15DSA_dup_DH() duplicates DSA parameters/keys as DH parameters/keys. q 16is lost during that conversion, but the resulting DH parameters 17contain its length. 18 19=head1 RETURN VALUES 20 21DSA_dup_DH() returns the new B<DH> structure, and NULL on error. The 22error codes can be obtained by L<ERR_get_error(3)>. 23 24=head1 NOTE 25 26Be careful to avoid small subgroup attacks when using this. 27 28=head1 SEE ALSO 29 30L<DH_new(3)>, L<DSA_new(3)>, L<ERR_get_error(3)> 31 32=head1 COPYRIGHT 33 34Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved. 35 36Licensed under the OpenSSL license (the "License"). You may not use 37this file except in compliance with the License. You can obtain a copy 38in the file LICENSE in the source distribution or at 39L<https://www.openssl.org/source/license.html>. 40 41=cut 42