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Add checking z sign in affineFromJacobian

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Abd ar-Rahman Hamidi 2019-01-09 17:02:28 +05:00 committed by GitHub
parent d70c4faf20
commit 18ba492d74
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4
crypto/secp256k1/curve.go
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@ -116,6 +116,10 @@ func (BitCurve *BitCurve) IsOnCurve(x, y *big.Int) bool {
// affineFromJacobian reverses the Jacobian transform. See the comment at the // affineFromJacobian reverses the Jacobian transform. See the comment at the
// top of the file. // top of the file.
func (BitCurve *BitCurve) affineFromJacobian(x, y, z *big.Int) (xOut, yOut *big.Int) { func (BitCurve *BitCurve) affineFromJacobian(x, y, z *big.Int) (xOut, yOut *big.Int) {
if z.Sign() == 0 {
return new(big.Int), new(big.Int)
}
zinv := new(big.Int).ModInverse(z, BitCurve.P) zinv := new(big.Int).ModInverse(z, BitCurve.P)
zinvsq := new(big.Int).Mul(zinv, zinv) zinvsq := new(big.Int).Mul(zinv, zinv)