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Removed test for point equality in ecdsa_verify_digest, point_add() already handles that.

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This commit is contained in:
Ondrej Mikle 2014-07-04 15:50:29 +02:00
parent da6a09880d
commit 6d61cefdb3
1 changed files with 0 additions and 7 deletions
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7
ecdsa.c
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@ -520,13 +520,6 @@ int ecdsa_verify_digest(const uint8_t *pub_key, const uint8_t *sig, const uint8_
for (j = 0; j < 30; j++) { for (j = 0; j < 30; j++) {
if (i == 8 && (s.val[i] >> j) == 0) break; if (i == 8 && (s.val[i] >> j) == 0) break;
if (s.val[i] & (1u << j)) { if (s.val[i] & (1u << j)) {
bn_mod(&(pub.x), &prime256k1);
bn_mod(&(res.x), &prime256k1);
if (bn_is_equal(&(pub.x), &(res.x))) {
// this is not a failure, but a very inprobable case
// that we don't handle because of its inprobability
return 4;
}
point_add(&pub, &res); point_add(&pub, &res);
} }
point_double(&pub); point_double(&pub);