From f3f9be495c6a9c37340e7fe4879b945afc060c92 Mon Sep 17 00:00:00 2001
From: MITSUNARI Shigeo <herumi@nifty.com>
Date: Fri, 22 Mar 2019 14:45:17 +0900
Subject: [PATCH] shortcut for Ec::mul(Px, P, x) if P = 0

---
 include/mcl/ec.hpp | 4 ++++
 include/mcl/op.hpp | 2 +-
 readme.md          | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/mcl/ec.hpp b/include/mcl/ec.hpp
index 840fa01..b8eb10b 100644
--- a/include/mcl/ec.hpp
+++ b/include/mcl/ec.hpp
@@ -910,6 +910,10 @@ 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 && x.isZero()) {
+			z.clear();
+			return;
+		}
 		if (mulArrayGLV && (constTime || yn > 1)) {
 			mulArrayGLV(z, x, y, yn, isNegative, constTime);
 			return;
diff --git a/include/mcl/op.hpp b/include/mcl/op.hpp
index 549d93b..36d3703 100644
--- a/include/mcl/op.hpp
+++ b/include/mcl/op.hpp
@@ -26,7 +26,7 @@
 
 namespace mcl {
 
-static const int version = 0x091; /* 0xABC = A.BC */
+static const int version = 0x092; /* 0xABC = A.BC */
 
 /*
 	specifies available string format mode for X::setIoMode()
diff --git a/readme.md b/readme.md
index 04d2ef3..8bd56f0 100644
--- a/readme.md
+++ b/readme.md
@@ -443,6 +443,7 @@ Y. Sakemi, Y. Nogami, K. Okeya, Y. Morikawa, CANS 2008.
 
 # History
 
+* 2019/Mar/22 v0.92 shortcut for Ec::mul(Px, P, x) if P = 0
 * 2019/Mar/21 python binding of she256 for Linux/Mac/Windows
 * 2019/Mar/14 v0.91 modp supports mcl-wasm
 * 2019/Mar/12 v0.90 fix Vint::setArray(x) for x == this