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Avoid extra ByteReverse 

This gains about 0.6 cpb. SHA-1 is down to 1.9 cpb. SHA-256 is not affected
pull/242/merge
Jeffrey Walton 2017-05-25 06:20:00 -04:00
parent b65ec291ea
commit 3b56ba118f
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GPG Key ID: B36AB348921B1838
2 changed files with 8 additions and 5 deletions
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11
iterhash.cpp
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@ -82,11 +82,14 @@ template <class T, class BASE> byte * IteratedHashBase<T, BASE>::CreateUpdateSpa
template <class T, class BASE> size_t IteratedHashBase<T, BASE>::HashMultipleBlocks(const T *input, size_t length) template <class T, class BASE> size_t IteratedHashBase<T, BASE>::HashMultipleBlocks(const T *input, size_t length)
{ {
// Hardware based SHA1 and SHA256 correct blocks themselves due to hardware requirements. #if CRYPTOPP_BOOL_SSE_SHA_INTRINSICS_AVAILABLE
// For Intel, SHA1 will effectively call ByteReverse(). SHA256 formats data to Intel // SHA-1 and SHA-256 only
// requirements, which means eight words ABCD EFGH are transformed to ABEF CDGH. static const bool noReverse = HasSHA() && this->BlockSize() <= 64;
#else
const bool noReverse = NativeByteOrderIs(this->GetByteOrder());
#endif
unsigned int blockSize = this->BlockSize(); unsigned int blockSize = this->BlockSize();
bool noReverse = NativeByteOrderIs(this->GetByteOrder());
T* dataBuf = this->DataBuf(); T* dataBuf = this->DataBuf();
do do
{ {

2
sha.cpp
View File

@ -112,7 +112,7 @@ static void SHA1_SSE_SHA_Transform(word32 *state, const word32 *data)
ABCD = _mm_loadu_si128((__m128i*) state); ABCD = _mm_loadu_si128((__m128i*) state);
E0 = _mm_set_epi32(state[4], 0, 0, 0); E0 = _mm_set_epi32(state[4], 0, 0, 0);
ABCD = _mm_shuffle_epi32(ABCD, 0x1B); ABCD = _mm_shuffle_epi32(ABCD, 0x1B);
MASK = _mm_set_epi8(3,2,1,0, 7,6,5,4, 11,10,9,8, 15,14,13,12); MASK = _mm_set_epi8(0,1,2,3, 4,5,6,7, 8,9,10,11, 12,13,14,15);
// Save current hash // Save current hash
ABCD_SAVE = ABCD; ABCD_SAVE = ABCD;