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fixed Salsa20 initialization crash on non-SSE2 machines

pull/2/head
weidai 2007-08-13 23:48:17 +00:00
parent d42ea79cd7
commit b130b99781
1 changed files with 57 additions and 54 deletions
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17
salsa.cpp
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@ -72,11 +72,6 @@ unsigned int Salsa20_Policy::GetOptimalBlockSize() const
}
#endif
#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
static const __m128i s_maskLo32 = _mm_shuffle_epi32(_mm_cvtsi32_si128(-1), _MM_SHUFFLE(1, 0, 1, 0));
static const __m128i s_maskHi32 = _mm_slli_epi64(s_maskLo32, 32);
#endif
void Salsa20_Policy::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
{
int i;
@ -207,9 +202,13 @@ void Salsa20_Policy::OperateKeystream(KeystreamOperation operation, byte *output
}
#endif
if (!IsP4()) while (iterationCount)
if (!IsP4() && iterationCount > 0)
{
const __m128i s_maskLo32 = _mm_shuffle_epi32(_mm_cvtsi32_si128(-1), _MM_SHUFFLE(1, 0, 1, 0));
const __m128i s_maskHi32 = _mm_slli_epi64(s_maskLo32, 32);
do
{
--iterationCount;
__m128i x0 = s[0];
__m128i x1 = s[1];
__m128i x2 = s[2];
@ -264,6 +263,8 @@ void Salsa20_Policy::OperateKeystream(KeystreamOperation operation, byte *output
CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(SSE2_OUTPUT, BYTES_PER_ITERATION);
}
while (--iterationCount);
}
}
#endif
@ -325,7 +326,9 @@ void Salsa20_Policy::OperateKeystream(KeystreamOperation operation, byte *output
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 14, x6 + m_state[6]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 15, x3 + m_state[3]);}
#ifndef CRYPTOPP_DOXYGEN_PROCESSING
CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(SALSA_OUTPUT, BYTES_PER_ITERATION);
#endif
if (++m_state[8] == 0)
++m_state[5];