rai mahua wrote:
Hi,
I have a case wherein I get the message that has been
signed + the R & S value of the DSA generated
signature.
How do I verify this using openssl lib.
put the r and s value into a DSA_SIG structure (i.e. something
like:
DSA_SIG *dsasig = DSA_SIG_new();
BN_bin2bn(r, r_len, dsasig->r);
BN_bin2bn(s, s_len, dsasig->s); )
and then use DSA_do_verify with sha-1 hash of the message (and, of
course, the public key in the DSA object).
Nils
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