diff options
Diffstat (limited to 'src/crypto/elliptic/elliptic.go')
| -rw-r--r-- | src/crypto/elliptic/elliptic.go | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/crypto/elliptic/elliptic.go b/src/crypto/elliptic/elliptic.go index f93dc16419..afedf18df1 100644 --- a/src/crypto/elliptic/elliptic.go +++ b/src/crypto/elliptic/elliptic.go @@ -71,6 +71,11 @@ func (curve *CurveParams) polynomial(x *big.Int) *big.Int { } func (curve *CurveParams) IsOnCurve(x, y *big.Int) bool { + if x.Sign() < 0 || x.Cmp(curve.P) >= 0 || + y.Sign() < 0 || y.Cmp(curve.P) >= 0 { + return false + } + // y² = x³ - 3x + b y2 := new(big.Int).Mul(y, y) y2.Mod(y2, curve.P) |