openssl/doc/crypto/DSA_dup_DH.pod
Geoff Thorpe 5bf738737d These are updates/fixes to DH/DSA/RAND docs based on the fixes to the RSA
docs. There were a couple of other places (including RSA) where the docs
were not quite synchronised with the API that are now fixed. One or two
still remain to be fixed though ...
2002-08-05 16:27:01 +00:00

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=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 VALUE
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)|ERR_get_error(3)>.
=head1 NOTE
Be careful to avoid small subgroup attacks when using this.
=head1 SEE ALSO
L<dh(3)|dh(3)>, L<dsa(3)|dsa(3)>, L<err(3)|err(3)>
=head1 HISTORY
DSA_dup_DH() was added in OpenSSL 0.9.4.
=cut