add sswuG1 for E1

include/mcl/mapto_wb19.hpp

@@ -433,15 +433,15 @@ struct MapTo_WB19 {
 			Fp::neg(y, y);
 		}
 	}
-	void sswuG1(Fp pt[3], const Fp& u) const
+	void sswuG1(E1& pt, const Fp& u) const
 	{
 		Fp xn, y;
-		Fp& xd = pt[2];
+		Fp& xd = pt.z;
 		sswuG1(xn, xd, y, u);
-		Fp::mul(pt[0], xn, xd);
+		Fp::mul(pt.x, xn, xd);
-		Fp::sqr(pt[1], xd);
+		Fp::sqr(pt.y, xd);
-		pt[1] *= xd;
+		pt.y *= xd;
-		pt[1] *= y;
+		pt.y *= y;
 	}
 	// https://github.com/algorand/bls_sigs_ref
 	void osswu2_help(E2& P, const Fp2& t) const
@@ -589,6 +589,27 @@ struct MapTo_WB19 {
 		}
 		map2curve_osswu2(out, msg, msgSize, dst, strlen(dst));
 	}
+#if 0
+	void msgToG1(G1& out, const void *msg, size_t msgSize) const
+	{
+		assert(draftVersion_ == 7);
+		const char *dst = "BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_POP_";
+		const size_t dstSize = strlen(dst);
+		uint8_t md[128];
+		mcl::fp::expand_message_xmd(md, sizeof(md), msg, msgSize, dst, dstSize);
+		Fp u[2];
+		for (size_t i = 0; i < 2; i++) {
+			bool b;
+			u[i].setBigEndianMod(&b, &md[64 * i], 64);
+			assert(b); (void)b;
+		}
+		E1 P1, P2;
+		sswuG1(P1, u[0]);
+		sswuG1(P2, u[1]);
+		ec::addJacobi(P1, P1, P2); // ok
+		// ec::normalizeJacobi(P1);
+	}
+#endif
 };
 
 } // mcl

test/mapto_wb19_test.cpp

@@ -812,7 +812,6 @@ void testHashToFp2v6(const T& mapto)
 			}
 		},
 	};
-	bn::setMapToMode(MCL_MAP_TO_MODE_HASH_TO_CURVE_06);
 	for (size_t i = 0; i < CYBOZU_NUM_OF_ARRAY(tbl); i++) {
 		const char *msg = tbl[i].msg;
 		const char *dst = tbl[i].dst;
@@ -856,7 +855,6 @@ void testHashToFp2v6(const T& mapto)
 template<class T>
 void testHashToFp2v7(const T& mapto)
 {
-	bn::setMapToMode(MCL_MAP_TO_MODE_HASH_TO_CURVE_07);
 	{
 		const char *msg = "asdf";
 		PointStr s = {
@@ -1048,7 +1046,6 @@ void testEth2phase0()
 			"882730e5d03f6b42c3abc26d3372625034e1d871b65a8a6b900a56dae22da98abbe1b68f85e49fe7652a55ec3d0591c20767677e33e5cbb1207315c41a9ac03be39c2e7668edc043d6cb1d9fd93033caa8a1c5b0e84bedaeb6c64972503a43eb",
 		},
 	};
-	bn::setMapToMode(MCL_MAP_TO_MODE_HASH_TO_CURVE_07);
 	for (size_t i = 0; i < CYBOZU_NUM_OF_ARRAY(tbl); i++) {
 		const Uint8Vec msg = fromHexStr(tbl[i].msg);
 		const Uint8Vec out = fromHexStr(tbl[i].out);
@@ -1103,6 +1100,30 @@ void testSswuG1(const T& mapto)
 	}
 }
 
+template<class T>
+void testMsgToG1(const T& mapto)
+{
+	const struct {
+		const char *msg;
+		const char *x;
+		const char *y;
+		const char *z;
+	} tbl[] = {
+		{
+			"asdf",
+			"0",
+			"0",
+			"0",
+		},
+	};
+	for (size_t i = 0; i < CYBOZU_NUM_OF_ARRAY(tbl); i++) {
+		const char *msg = tbl[i].msg;
+		const size_t msgSize = strlen(msg);
+		G1 P;
+		mapto.msgToG1(P, msg, msgSize);
+	}
+}
+
 CYBOZU_TEST_AUTO(test)
 {
 	initPairing(mcl::BLS12_381);
@@ -1122,8 +1143,11 @@ CYBOZU_TEST_AUTO(test)
 	testVec("../misc/mapto/fips_186_3_B233.txt");
 	testVec("../misc/mapto/misc.txt");
 	ethMsgToG2testAll("../bls_sigs_ref/test-vectors/hash_g2/");
+	bn::setMapToMode(MCL_MAP_TO_MODE_HASH_TO_CURVE_06);
 	testHashToFp2v6(mapto);
+	bn::setMapToMode(MCL_MAP_TO_MODE_HASH_TO_CURVE_07);
 	testHashToFp2v7(mapto);
 	testEth2phase0();
 	testSswuG1(mapto);
+//	testMsgToG1(mapto);
 }