From 9f335d719ebc27f58251559240de0077ec42c583 Mon Sep 17 00:00:00 2001
From: Pierre Lestringant <plt@amossys.fr>
Date: Wed, 6 Apr 2016 15:51:17 +0200
Subject: [PATCH] Fix the Rijndael timing attack counter measure
---
rijndael.cpp | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/rijndael.cpp b/rijndael.cpp
index f394960..92f9dea 100644
--- a/rijndael.cpp
+++ b/rijndael.cpp
@@ -391,7 +391,7 @@ void Rijndael::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock
// timing attack countermeasure. see comments at top for more details
const int cacheLineSize = GetCacheLineSize();
unsigned int i;
- word32 u = 0;
+ volatile word32 u = 0;
#if defined(CRYPTOPP_ALLOW_UNALIGNED_DATA_ACCESS) || defined(CRYPTOPP_ALLOW_RIJNDAEL_UNALIGNED_DATA_ACCESS)
for (i=0; i<2048; i+=cacheLineSize)
#else
@@ -467,7 +467,7 @@ void Rijndael::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock
// timing attack countermeasure. see comments at top for more details
const int cacheLineSize = GetCacheLineSize();
unsigned int i;
- word32 u = 0;
+ volatile word32 u = 0;
#if defined(CRYPTOPP_ALLOW_UNALIGNED_DATA_ACCESS) || defined(CRYPTOPP_ALLOW_RIJNDAEL_UNALIGNED_DATA_ACCESS)
for (i=0; i<2048; i+=cacheLineSize)
#else