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Cleanup GCM code 

I always thought the SSE code in GCM_ReverseHashBufferIfNeeded_CLMUL was a wart
pull/703/head
Jeffrey Walton 2018-08-10 04:42:30 -04:00
parent 1c224c8798
commit 23e0ee44a0
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GPG Key ID: B36AB348921B1838
1 changed files with 4 additions and 6 deletions
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10
gcm-simd.cpp
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@ -741,9 +741,9 @@ size_t GCM_AuthenticateBlocks_CLMUL(const byte *data, size_t len, const byte *mt
void GCM_ReverseHashBufferIfNeeded_CLMUL(byte *hashBuffer)
{
// SSSE3 instruction, but only used with CLMUL
__m128i &val = *M128_CAST(hashBuffer);
const __m128i mask = _mm_set_epi32(0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f);
val = _mm_shuffle_epi8(val, mask);
_mm_storeu_si128(M128_CAST(hashBuffer), _mm_shuffle_epi8(
_mm_loadu_si128(CONST_M128_CAST(hashBuffer)), mask));
}
#endif // CRYPTOPP_CLMUL_AVAILABLE
@ -764,10 +764,8 @@ uint64x2_p GCM_Reduce_VMULL(uint64x2_p c0, uint64x2_p c1, uint64x2_p c2, uint64x
c1 = VectorXor(c1, VectorShiftRight<8>(c0));
c1 = VectorXor(c1, VMULL_10(c0, r));
c0 = VectorShiftLeft<8>(c0);
c0 = VectorXor(c0, c1);
c0 = vec_sl(c0, m1);
c0 = VMULL_00(c0, r);
c0 = VectorXor(c1, VectorShiftLeft<8>(c0));
c0 = VMULL_00(vec_sl(c0, m1), r);
c2 = VectorXor(c2, c0);
c2 = VectorXor(c2, VectorShiftLeft<8>(c1));
c1 = vec_sr(vec_mergeh(c1, c2), m63);