DSA_dup_DH - create a DH structure out of DSA structure
DH * DSA_dup_DH(const DSA *r);
duplicates DSA parameters/keys as DH parameters/keys. q is
lost during that conversion, but the resulting DH parameters contain its
returns the new DH
structure, and NULL on error. The
error codes can be obtained by ERR_get_error
Be careful to avoid small subgroup attacks when using this.
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