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DSA_DUP_DH(3) Library Functions Manual DSA_DUP_DH(3)

DSA_dup_DHcreate a DH structure out of DSA structure

#include <openssl/dsa.h>

DH *
DSA_dup_DH(const DSA *r);

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

DSA_dup_DH() returns the new DH structure or NULL on error. The error codes can be obtained by ERR_get_error(3).

DH_new(3), DSA_get0_pqg(3), DSA_new(3)

DSA_dup_DH() first appeared in OpenSSL 0.9.4 and has been available since OpenBSD 2.6.

Be careful to avoid small subgroup attacks when using this.

June 10, 2019 OpenBSD-6.7