From 13d9500f3f9ac721fe186abdd7d74da5fb1dec9b Mon Sep 17 00:00:00 2001
From: MITSUNARI Shigeo <herumi@nifty.com>
Date: Fri, 6 Sep 2019 22:17:58 +0900
Subject: [PATCH] Ec::mulSmallInt errors if negative

---
 include/mcl/ec.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/mcl/ec.hpp b/include/mcl/ec.hpp
index 7ff7e8a..708b854 100644
--- a/include/mcl/ec.hpp
+++ b/include/mcl/ec.hpp
@@ -994,7 +994,7 @@ public:
 	bool operator<=(const EcT& rhs) const { return !operator>(rhs); }
 	static inline void mulArray(EcT& z, const EcT& x, const fp::Unit *y, size_t yn, bool isNegative, bool constTime = false)
 	{
-		if (!constTime && yn == 1 && *y <= 16) {
+		if (!constTime && yn == 1 && *y <= 16 && !isNegative) {
 			if (mulSmallInt(z, x, static_cast<int>(*y), isNegative)) return;
 		}
 		if (mulArrayGLV && (constTime || yn > 1)) {