core/vm, crypto/bn256: fix bn256 use and pairing corner case

crypto/bn256/bn256.go

@@ -379,16 +379,22 @@ func Pair(g1 *G1, g2 *G2) *GT {
 	return &GT{optimalAte(g2.p, g1.p, new(bnPool))}
 }
 
+// PairingCheck calculates the Optimal Ate pairing for a set of points.
 func PairingCheck(a []*G1, b []*G2) bool {
 	pool := new(bnPool)
-	e := newGFp12(pool)
-	e.SetOne()
+
+	acc := newGFp12(pool)
+	acc.SetOne()
+
 	for i := 0; i < len(a); i++ {
-		new_e := miller(b[i].p, a[i].p, pool)
-		e.Mul(e, new_e, pool)
+		if a[i].p.IsInfinity() || b[i].p.IsInfinity() {
+			continue
+		}
+		acc.Mul(acc, miller(b[i].p, a[i].p, pool), pool)
 	}
-	ret := finalExponentiation(e, pool)
-	e.Put(pool)
+	ret := finalExponentiation(acc, pool)
+	acc.Put(pool)
+
 	return ret.IsOne()
 }
 

crypto/bn256/optate.go

@@ -393,6 +393,5 @@ func optimalAte(a *twistPoint, b *curvePoint, pool *bnPool) *gfP12 {
 	if a.IsInfinity() || b.IsInfinity() {
 		ret.SetOne()
 	}
-
 	return ret
 }