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Uncomment existing SHA256::Transform, enable when __OPTIMIZE_SIZE__ is defined

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This is Wei's original code. It was commented out, but it might be useful to some since IoT gadgets are becoming more popular
This commit is contained in:
Jeffrey Walton 2016-09-13 21:06:42 -04:00
parent ff67abdec5
commit db768200ab
1 changed files with 34 additions and 34 deletions
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68
sha.cpp
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@ -506,39 +506,8 @@ size_t SHA224::HashMultipleBlocks(const word32 *input, size_t length)
#define s0(x) (rotrFixed(x,7)^rotrFixed(x,18)^(x>>3))
#define s1(x) (rotrFixed(x,17)^rotrFixed(x,19)^(x>>10))
void SHA256::Transform(word32 *state, const word32 *data)
{
word32 W[16];
#if (defined(CRYPTOPP_X86_ASM_AVAILABLE) || defined(CRYPTOPP_X32_ASM_AVAILABLE) || defined(CRYPTOPP_X64_MASM_AVAILABLE)) && !defined(CRYPTOPP_DISABLE_SHA_ASM)
// this byte reverse is a waste of time, but this function is only called by MDC
ByteReverse(W, data, BLOCKSIZE);
X86_SHA256_HashBlocks(state, W, BLOCKSIZE - !HasSSE2());
#else
word32 T[8];
/* Copy context->state[] to working vars */
memcpy(T, state, sizeof(T));
/* 64 operations, partially loop unrolled */
for (unsigned int j=0; j<64; j+=16)
{
R( 0); R( 1); R( 2); R( 3);
R( 4); R( 5); R( 6); R( 7);
R( 8); R( 9); R(10); R(11);
R(12); R(13); R(14); R(15);
}
/* Add the working vars back into context.state[] */
state[0] += a(0);
state[1] += b(0);
state[2] += c(0);
state[3] += d(0);
state[4] += e(0);
state[5] += f(0);
state[6] += g(0);
state[7] += h(0);
#endif
}
/*
// smaller but slower
// Smaller but slower
#if defined(__OPTIMIZE_SIZE__)
void SHA256::Transform(word32 *state, const word32 *data)
{
word32 T[20];
@ -610,7 +579,38 @@ void SHA256::Transform(word32 *state, const word32 *data)
state[6] += t[6];
state[7] += t[7];
}
*/
#else
void SHA256::Transform(word32 *state, const word32 *data)
{
word32 W[16];
#if (defined(CRYPTOPP_X86_ASM_AVAILABLE) || defined(CRYPTOPP_X32_ASM_AVAILABLE) || defined(CRYPTOPP_X64_MASM_AVAILABLE)) && !defined(CRYPTOPP_DISABLE_SHA_ASM)
// this byte reverse is a waste of time, but this function is only called by MDC
ByteReverse(W, data, BLOCKSIZE);
X86_SHA256_HashBlocks(state, W, BLOCKSIZE - !HasSSE2());
#else
word32 T[8];
/* Copy context->state[] to working vars */
memcpy(T, state, sizeof(T));
/* 64 operations, partially loop unrolled */
for (unsigned int j=0; j<64; j+=16)
{
R( 0); R( 1); R( 2); R( 3);
R( 4); R( 5); R( 6); R( 7);
R( 8); R( 9); R(10); R(11);
R(12); R(13); R(14); R(15);
}
/* Add the working vars back into context.state[] */
state[0] += a(0);
state[1] += b(0);
state[2] += c(0);
state[3] += d(0);
state[4] += e(0);
state[5] += f(0);
state[6] += g(0);
state[7] += h(0);
#endif
}
#endif
#undef S0
#undef S1