From 331c1a15635e70c6f84e38e8c8f80727588cda03 Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Tue, 11 Oct 2011 22:44:16 +0900
Subject: [PATCH] change return value of carry

---
 src/bn.c | 6 +++---
 src/bn.h | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/bn.c b/src/bn.c
index e0e7d95..9d97d90 100644
--- a/src/bn.c
+++ b/src/bn.c
@@ -24,7 +24,7 @@
 #include <stdint.h>
 #include "bn.h"
 
-int
+uint32_t
 bn256_add (bn256 *X, const bn256 *A, const bn256 *B)
 {
   int i;
@@ -50,7 +50,7 @@ bn256_add (bn256 *X, const bn256 *A, const bn256 *B)
   return carry;
 }
 
-int
+uint32_t
 bn256_sub (bn256 *X, const bn256 *A, const bn256 *B)
 {
   int i;
@@ -183,7 +183,7 @@ bn256_sqr (bn512 *X, const bn256 *A)
   X->words[k] = r0;
 }
 
-int
+uint32_t
 bn256_shift (bn256 *X, const bn256 *A, int shift)
 {
   int i;
diff --git a/src/bn.h b/src/bn.h
index ac0adad..a4e2f63 100644
--- a/src/bn.h
+++ b/src/bn.h
@@ -8,11 +8,11 @@ typedef struct bn512 {
   uint32_t words[ BN512_WORDS ]; /* Little endian */
 } bn512;
 
-int bn256_add (bn256 *X, const bn256 *A, const bn256 *B);
-int bn256_sub (bn256 *X, const bn256 *A, const bn256 *B);
+uint32_t bn256_add (bn256 *X, const bn256 *A, const bn256 *B);
+uint32_t bn256_sub (bn256 *X, const bn256 *A, const bn256 *B);
 void bn256_mul (bn512 *X, const bn256 *A, const bn256 *B);
 void bn256_sqr (bn512 *X, const bn256 *A);
-int bn256_shift (bn256 *X, const bn256 *A, int shift);
+uint32_t bn256_shift (bn256 *X, const bn256 *A, int shift);
 int bn256_is_zero (const bn256 *X);
 int bn256_is_even (const bn256 *X);
 int bn256_is_ge (const bn256 *A, const bn256 *B);