init: v1.0.0

sm/sm9/utils.go

@@ -0,0 +1,42 @@
+package sm9
+
+import (
+	"math/big"
+)
+
+// dup duplicates a byte slice b.
+func dup(b []byte) []byte {
+	ret := make([]byte, len(b))
+	copy(ret, b)
+	return ret
+}
+
+// pairingThenMul computes e = e(p,q)^k
+func pairingThenMul(p *G1, q *G2, k *big.Int) *GT {
+	e := Pairing(p, q)
+	return e.ScalarMult(e, k)
+}
+
+// mulG1ThenPairing computes e = e(p,q)^k = e(kp,q)
+func mulG1ThenPairing(p *G1, q *G2, k *big.Int) *GT {
+	p1 := (&G1{}).ScalarMult(p, k)
+	return Pairing(p1, q)
+}
+
+// mulG2ThenPairing computes e = e(p,q)^k = e(p,kq)
+func mulG2ThenPairing(p *G1, q *G2, k *big.Int) *GT {
+	q2 := (&G2{}).ScalarMult(q, k)
+	return Pairing(p, q2)
+}
+
+// mulG1BaseThenPairing computes e = e(p,q)^k = e(kp,q)
+func mulG1BaseThenPairing(e *GT, q *G2, k *big.Int) {
+	p1 := (&G1{}).ScalarBaseMult(k)
+	pairing(e, p1, q)
+}
+
+// mulG2BaseThenPairing computes e = e(p,q)^k = e(kp,q)
+func mulG2BaseThenPairing(p *G1, k *big.Int) *GT {
+	q2 := (&G2{}).ScalarBaseMult(k)
+	return Pairing(p, q2)
+}