Fix for constant time (step 7)

2014-01-22 14:26:41 +09:00
parent 6a69c31c3b
commit 251760d5da
2 changed files with 4 additions and 3 deletions
--- a/4
+++ b/4
@@ -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.

--- 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;