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invert pby when normalizing S during signing

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Pavol Rusnak 2014-12-23 18:13:33 +01:00
parent 89a7d7797b
commit 795579cbac
1 changed files with 3 additions and 0 deletions
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3
ecdsa.c
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@ -364,6 +364,9 @@ int ecdsa_sign_digest(const uint8_t *priv_key, const uint8_t *digest, uint8_t *s
// if S > order/2 => S = -S
if (bn_is_less(&order256k1_half, &k)) {
bn_substract_noprime(&order256k1, &k, &k);
if (pby) {
*pby = !*pby;
}
}
// we are done, R.x and k is the result signature