fix: ECPoint.ScalarMult

bnb-chain · Apr 13, 2024 · 859dd6b · 859dd6b
1 parent 7113b68
commit 859dd6b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/crypto/ecpoint.go b/crypto/ecpoint.go
@@ -60,7 +60,8 @@ func (p *ECPoint) Add(p1 *ECPoint) (*ECPoint, error) {
 }
 
 func (p *ECPoint) ScalarMult(k *big.Int) *ECPoint {
- x, y := p.curve.ScalarMult(p.X(), p.Y(), k.Bytes())
+ kModN := new(big.Int).Mod(k, p.curve.Params().N)
+ x, y := p.curve.ScalarMult(p.X(), p.Y(), kModN.Bytes())
  newP, err := NewECPoint(p.curve, x, y) // it must be on the curve, no need to check.
  if err != nil {
  panic(fmt.Errorf("scalar mult to an ecpoint %s", err.Error()))