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Update twist.go

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Antonio Sanso 2025-06-20 10:56:10 +02:00 committed by GitHub
parent 35dd61a3bf
commit da8f1a872a
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GPG key ID: B5690EEEBB952194
1 changed files with 4 additions and 1 deletions
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5
crypto/bn256/cloudflare/twist.go
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@ -43,7 +43,7 @@ func (c *twistPoint) Set(a *twistPoint) {
c.t.Set(&a.t) c.t.Set(&a.t)
} }
// IsOnCurve returns true iff c is on the curve. // IsOnCurve returns true iff c is on the curve and is in the correct subgroup.
func (c *twistPoint) IsOnCurve() bool { func (c *twistPoint) IsOnCurve() bool {
c.MakeAffine() c.MakeAffine()
if c.IsInfinity() { if c.IsInfinity() {
@ -57,6 +57,9 @@ func (c *twistPoint) IsOnCurve() bool {
if *y2 != *x3 { if *y2 != *x3 {
return false return false
} }
// Subgroup check: multiply the point by the group order and
// verify that it becomes the point at infinity.
cneg := &twistPoint{} cneg := &twistPoint{}
cneg.Mul(c, Order) cneg.Mul(c, Order)
return cneg.z.IsZero() return cneg.z.IsZero()