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| author | Michael Stapelberg <stapelberg@debian.org> | 2013-03-04 21:27:36 +0100 |
|---|---|---|
| committer | Michael Stapelberg <michael@stapelberg.de> | 2013-03-04 21:27:36 +0100 |
| commit | 04b08da9af0c450d645ab7389d1467308cfc2db8 (patch) | |
| tree | db247935fa4f2f94408edc3acd5d0d4f997aa0d8 /src/pkg/crypto/ecdsa/ecdsa.go | |
| parent | 917c5fb8ec48e22459d77e3849e6d388f93d3260 (diff) | |
| download | golang-upstream/1.1_hg20130304.tar.gz | |
Imported Upstream version 1.1~hg20130304upstream/1.1_hg20130304
Diffstat (limited to 'src/pkg/crypto/ecdsa/ecdsa.go')
| -rw-r--r-- | src/pkg/crypto/ecdsa/ecdsa.go | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/pkg/crypto/ecdsa/ecdsa.go b/src/pkg/crypto/ecdsa/ecdsa.go index 8508e3b4f..512d20c63 100644 --- a/src/pkg/crypto/ecdsa/ecdsa.go +++ b/src/pkg/crypto/ecdsa/ecdsa.go @@ -140,14 +140,16 @@ func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool { w := new(big.Int).ModInverse(s, N) u1 := e.Mul(e, w) + u1.Mod(u1, N) u2 := w.Mul(r, w) + u2.Mod(u2, N) x1, y1 := c.ScalarBaseMult(u1.Bytes()) x2, y2 := c.ScalarMult(pub.X, pub.Y, u2.Bytes()) - if x1.Cmp(x2) == 0 { + x, y := c.Add(x1, y1, x2, y2) + if x.Sign() == 0 && y.Sign() == 0 { return false } - x, _ := c.Add(x1, y1, x2, y2) x.Mod(x, N) return x.Cmp(r) == 0 } |