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Diffstat (limited to 'src/crypto/elliptic/p521.go')
| -rw-r--r-- | src/crypto/elliptic/p521.go | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/crypto/elliptic/p521.go b/src/crypto/elliptic/p521.go index 3d355943ec..587991e31b 100644 --- a/src/crypto/elliptic/p521.go +++ b/src/crypto/elliptic/p521.go @@ -32,6 +32,11 @@ func (curve p521Curve) Params() *CurveParams { } func (curve p521Curve) 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 + } + x1 := bigIntToFiatP521(x) y1 := bigIntToFiatP521(y) b := bigIntToFiatP521(curve.B) // TODO: precompute this value. |