Function Verify

sm2/sm2.go:211–238

* za, err := ZA(pub, uid) if err != nil { return } e, err := msgHash(za, msg) hash=e.getBytes() */

(pub *PublicKey, hash []byte, r, s *big.Int)

	hash=e.getBytes()
*/
func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool {
	c := pub.Curve
	N := c.Params().N

	if r.Sign() <= 0 || s.Sign() <= 0 {
		return false
	}
	if r.Cmp(N) >= 0 || s.Cmp(N) >= 0 {
		return false
	}

	// 调整算法细节以实现SM2
	t := new(big.Int).Add(r, s)
	t.Mod(t, N)
	if t.Sign() == 0 {
		return false
	}

	var x *big.Int
	x1, y1 := c.ScalarBaseMult(s.Bytes())
	x2, y2 := c.ScalarMult(pub.X, pub.Y, t.Bytes())
	x, _ = c.Add(x1, y1, x2, y2)

	e := new(big.Int).SetBytes(hash)
	x.Add(x, e)
	x.Mod(x, N)
	return x.Cmp(r) == 0
}

/*
 * sm2密文结构如下: