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fix comparison of points

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This commit is contained in:
Pavol Rusnak 2014-07-04 15:07:02 +02:00
parent abf7178319
commit 82ed3f31db
1 changed files with 3 additions and 3 deletions
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ecdsa.c
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@ -460,9 +460,9 @@ int ecdsa_verify_digest(const uint8_t *pub_key, const uint8_t *sig, const uint8_
for (j = 0; j < 30; j++) {
if (i == 8 && (s.val[i] >> j) == 0) break;
if (s.val[i] & (1u << j)) {
bn_mod(&(pub.y), &prime256k1);
bn_mod(&(res.y), &prime256k1);
if (bn_is_equal(&(pub.y), &(res.y))) {
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;