fix isValidOrder for G2

include/mcl/ec.hpp

@@ -212,7 +212,7 @@ public:
 	bool isValidOrder() const
 	{
 		EcT Q;
-		EcT::mul(Q, *this, order_);
+		EcT::mulGeneric(Q, *this, order_);
 		return Q.isZero();
 	}
 	bool isValid() const

test/bn384_test.cpp

@@ -50,6 +50,12 @@ CYBOZU_TEST_AUTO(pairing)
 	testCurve(mcl::bn::CurveFp382_1);
 	puts("CurveFp382_2");
 	testCurve(mcl::bn::CurveFp382_2);
+	// Q is not on EcT, but bad order
+	{
+		const char *s = "1 18d3d8c085a5a5e7553c3a4eb628e88b8465bf4de2612e35a0a4eb018fb0c82e9698896031e62fd7633ffd824a859474 1dc6edfcf33e29575d4791faed8e7203832217423bf7f7fbf1f6b36625b12e7132c15fbc15562ce93362a322fb83dd0d 65836963b1f7b6959030ddfa15ab38ce056097e91dedffd996c1808624fa7e2644a77be606290aa555cda8481cfb3cb 1b77b708d3d4f65aeedf54b58393463a42f0dc5856baadb5ce608036baeca398c5d9e6b169473a8838098fd72fd28b50";
+		G2 Q;
+		CYBOZU_TEST_EXCEPTION(Q.setStr(s, 16), std::exception);
+	}
 }
 
 int main(int argc, char *argv[])