From c29bd10555e1f73622a22e3da5df80ff607ac0a8 Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Wed, 22 Jan 2014 15:53:13 +0900
Subject: [PATCH] bug fix

---
 src/mod.c     | 4 ++--
 src/modp256.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/mod.c b/src/mod.c
index 888c9f8..9801599 100644
--- a/src/mod.c
+++ b/src/mod.c
@@ -158,7 +158,7 @@ mod_inv (bn256 *C, const bn256 *X, const bn256 *N)
 
       switch (c)
 	{
-	case 0:
+	case 3:
 	  bn256_shift (u, u, -1);
 	  if (bn256_is_even (A))
 	    {
@@ -293,7 +293,7 @@ mod_inv (bn256 *C, const bn256 *X, const bn256 *N)
 	    }
 	  break;
 
-	case 3:
+	case 0:
 	  bn256_shift (tmp, tmp, -1);
 	  if (bn256_is_even (tmp))
 	    {
diff --git a/src/modp256.c b/src/modp256.c
index 935be86..eb763c6 100644
--- a/src/modp256.c
+++ b/src/modp256.c
@@ -248,7 +248,7 @@ modp256_inv (bn256 *C, const bn256 *a)
 
       switch (c)
 	{
-	case 0:
+	case 3:
 	  bn256_shift (u, u, -1);
 	  if (bn256_is_even (A))
 	    {
@@ -359,7 +359,7 @@ modp256_inv (bn256 *C, const bn256 *a)
 	    }
 	  break;
 
-	case 3:
+	case 0:
 	  bn256_shift (tmp, tmp, -1);
 	  if (bn256_is_even (tmp))
 	    {