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 11The following functions have been deprecated since OpenSSL 3.0, and can be 12hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value, 13see L<openssl_user_macros(7)>: 14 15 DH *DSA_dup_DH(const DSA *r); 16 17=head1 DESCRIPTION 18 19The function described on this page is deprecated. There is no direct 20replacement, applications should use the EVP_PKEY APIs for Diffie-Hellman 21operations. 22 23DSA_dup_DH() duplicates DSA parameters/keys as DH parameters/keys. q 24is lost during that conversion, but the resulting DH parameters 25contain its length. 26 27=head1 RETURN VALUES 28 29DSA_dup_DH() returns the new B<DH> structure, and NULL on error. The 30error codes can be obtained by L<ERR_get_error(3)>. 31 32=head1 NOTE 33 34Be careful to avoid small subgroup attacks when using this. 35 36=head1 SEE ALSO 37 38L<DH_new(3)>, L<DSA_new(3)>, L<ERR_get_error(3)> 39 40=head1 HISTORY 41 42This function was deprecated in OpenSSL 3.0. 43 44=head1 COPYRIGHT 45 46Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved. 47 48Licensed under the Apache License 2.0 (the "License"). You may not use 49this file except in compliance with the License. You can obtain a copy 50in the file LICENSE in the source distribution or at 51L<https://www.openssl.org/source/license.html>. 52 53=cut 54