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Fix the Rijndael timing attack counter measure (Issue 146)

pull/157/head
Jeffrey Walton 2016-04-12 14:43:39 -04:00
parent 29e9bd2b27
commit 22f493dda9
1 changed files with 1 additions and 1 deletions
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rijndael.cpp
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@ -511,7 +511,7 @@ void Rijndael::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock
// timing attack countermeasure. see comments at top for more details // timing attack countermeasure. see comments at top for more details
// If CRYPTOPP_ALLOW_UNALIGNED_DATA_ACCESS is defined, // If CRYPTOPP_ALLOW_UNALIGNED_DATA_ACCESS is defined,
// QUARTER_ROUND_LD will use Td, which is already preloaded. // QUARTER_ROUND_LD will use Td, which is already preloaded.
u = 0; u = _u;
for (i=0; i<256; i+=cacheLineSize) for (i=0; i<256; i+=cacheLineSize)
u &= *(const word32 *)(const void *)(Sd+i); u &= *(const word32 *)(const void *)(Sd+i);
u &= *(const word32 *)(const void *)(Sd+252); u &= *(const word32 *)(const void *)(Sd+252);