From 251760d5da7e6d6d6ebb2eb0c526ad51da552cdf Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Wed, 22 Jan 2014 14:26:41 +0900
Subject: [PATCH] Fix for constant time (step 7)

---
 ChangeLog | 4 +++-
 src/bn.c  | 3 +--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 0d3996f..c65939e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,8 @@
 2014-01-22  Niibe Yutaka  <gniibe@fsij.org>
 
-	* src/mod.c (mod_inv): FIx for constant time.
+	* src/bn.c (bn256_sqr): Fix for constant time.
+
+	* src/mod.c (mod_inv): Fix for constant time.
 
 	* src/ec_p256.c (compute_kG): Simplify.
 
diff --git a/src/bn.c b/src/bn.c
index 4b40ab9..ee6f5cf 100644
--- a/src/bn.c
+++ b/src/bn.c
@@ -220,8 +220,7 @@ bn256_sqr (bn512 *X, const bn256 *A)
 	  uv = ((uint64_t )A->word[i])*((uint64_t )A->word[j]);
 	  if (i < j)
 	    {
-	      if ((uv >> 63) != 0)
-		r2++;
+	      r2 += ((uv >> 63) != 0);
 	      uv <<= 1;
 	    }
 	  v = uv;