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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_get_error(3)|ERR_get_error(3)> =head1 HISTORY DSA_dup_DH() was added in OpenSSL 0.9.4. =cut