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Fix one-off bug in signRFC6979

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junderw 2018-11-23 14:55:01 +09:00 • committed by Dave Collins
parent 67e573d211
commit 3dcf298fed
1 changed files with 1 additions and 3 deletions
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4
btcec/signature.go
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@ -427,9 +427,7 @@ func signRFC6979(privateKey *PrivateKey, hash []byte) (*Signature, error) {
k := nonceRFC6979(privkey.D, hash) k := nonceRFC6979(privkey.D, hash)
inv := new(big.Int).ModInverse(k, N) inv := new(big.Int).ModInverse(k, N)
r, _ := privkey.Curve.ScalarBaseMult(k.Bytes()) r, _ := privkey.Curve.ScalarBaseMult(k.Bytes())
if r.Cmp(N) == 1 { r.Mod(r, N)
r.Sub(r, N)
}
if r.Sign() == 0 { if r.Sign() == 0 {
return nil, errors.New("calculated R is zero") return nil, errors.New("calculated R is zero")