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chacha20_sse2.c
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#include "chacha20.h"
#include <immintrin.h>
#include <memory.h>
#if defined(USE_SSE)
inline void PartialXor(const __m128i val, uint8_t* Src, uint8_t* Dest, uint64_t Size)
{
_Alignas(16) uint8_t BuffForPartialOp[16];
memcpy(BuffForPartialOp, Src, Size);
_mm_storeu_si128((__m128i*)(BuffForPartialOp), _mm_xor_si128(val, _mm_loadu_si128((const __m128i*)BuffForPartialOp)));
memcpy(Dest, BuffForPartialOp, Size);
}
inline void PartialStore(const __m128i val, uint8_t* Dest, uint64_t Size)
{
_Alignas(16) uint8_t BuffForPartialOp[16];
_mm_storeu_si128((__m128i*)(BuffForPartialOp), val);
memcpy(Dest, BuffForPartialOp, Size);
}
inline __m128i RotateLeft7(const __m128i val)
{
return _mm_or_si128(_mm_slli_epi32(val, 7), _mm_srli_epi32(val, 32 - 7));
}
inline __m128i RotateLeft8(const __m128i val)
{
return _mm_or_si128(_mm_slli_epi32(val, 8), _mm_srli_epi32(val, 32 - 8));
}
inline __m128i RotateLeft12(const __m128i val)
{
return _mm_or_si128(_mm_slli_epi32(val, 12), _mm_srli_epi32(val, 32 - 12));
}
inline __m128i RotateLeft16(const __m128i val)
{
return _mm_or_si128(_mm_slli_epi32(val, 16), _mm_srli_epi32(val, 32 - 16));
}
void ChaCha20EncryptBytes(uint8_t* state, uint8_t* In, uint8_t* Out, uint64_t Size)
{
uint8_t* CurrentIn = In;
uint8_t* CurrentOut = Out;
uint64_t FullBlocksCount = Size / 256;
uint64_t RemainingBytes = Size % 256;
const __m128i state0 = _mm_set_epi32(1797285236, 2036477234, 857760878, 1634760805); //"expand 32-byte k"
const __m128i state1 = _mm_loadu_si128((const __m128i*)(state));
const __m128i state2 = _mm_loadu_si128((const __m128i*)((state)+16));
for (int64_t n = 0; n < FullBlocksCount; n++)
{
const __m128i state3 = _mm_loadu_si128((const __m128i*)((state)+32));
__m128i r0_0 = state0;
__m128i r0_1 = state1;
__m128i r0_2 = state2;
__m128i r0_3 = state3;
__m128i r1_0 = state0;
__m128i r1_1 = state1;
__m128i r1_2 = state2;
__m128i r1_3 = _mm_add_epi64(r0_3, _mm_set_epi32(0, 0, 0, 1));
__m128i r2_0 = state0;
__m128i r2_1 = state1;
__m128i r2_2 = state2;
__m128i r2_3 = _mm_add_epi64(r0_3, _mm_set_epi32(0, 0, 0, 2));
__m128i r3_0 = state0;
__m128i r3_1 = state1;
__m128i r3_2 = state2;
__m128i r3_3 = _mm_add_epi64(r0_3, _mm_set_epi32(0, 0, 0, 3));
for (int i = 20; i > 0; i -= 2)
{
r0_0 = _mm_add_epi32(r0_0, r0_1);
r1_0 = _mm_add_epi32(r1_0, r1_1);
r2_0 = _mm_add_epi32(r2_0, r2_1);
r3_0 = _mm_add_epi32(r3_0, r3_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r1_3 = _mm_xor_si128(r1_3, r1_0);
r2_3 = _mm_xor_si128(r2_3, r2_0);
r3_3 = _mm_xor_si128(r3_3, r3_0);
r0_3 = RotateLeft16(r0_3);
r1_3 = RotateLeft16(r1_3);
r2_3 = RotateLeft16(r2_3);
r3_3 = RotateLeft16(r3_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r1_2 = _mm_add_epi32(r1_2, r1_3);
r2_2 = _mm_add_epi32(r2_2, r2_3);
r3_2 = _mm_add_epi32(r3_2, r3_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r1_1 = _mm_xor_si128(r1_1, r1_2);
r2_1 = _mm_xor_si128(r2_1, r2_2);
r3_1 = _mm_xor_si128(r3_1, r3_2);
r0_1 = RotateLeft12(r0_1);
r1_1 = RotateLeft12(r1_1);
r2_1 = RotateLeft12(r2_1);
r3_1 = RotateLeft12(r3_1);
r0_0 = _mm_add_epi32(r0_0, r0_1);
r1_0 = _mm_add_epi32(r1_0, r1_1);
r2_0 = _mm_add_epi32(r2_0, r2_1);
r3_0 = _mm_add_epi32(r3_0, r3_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r1_3 = _mm_xor_si128(r1_3, r1_0);
r2_3 = _mm_xor_si128(r2_3, r2_0);
r3_3 = _mm_xor_si128(r3_3, r3_0);
r0_3 = RotateLeft8(r0_3);
r1_3 = RotateLeft8(r1_3);
r2_3 = RotateLeft8(r2_3);
r3_3 = RotateLeft8(r3_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r1_2 = _mm_add_epi32(r1_2, r1_3);
r2_2 = _mm_add_epi32(r2_2, r2_3);
r3_2 = _mm_add_epi32(r3_2, r3_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r1_1 = _mm_xor_si128(r1_1, r1_2);
r2_1 = _mm_xor_si128(r2_1, r2_2);
r3_1 = _mm_xor_si128(r3_1, r3_2);
r0_1 = RotateLeft7(r0_1);
r1_1 = RotateLeft7(r1_1);
r2_1 = RotateLeft7(r2_1);
r3_1 = RotateLeft7(r3_1);
r0_1 = _mm_shuffle_epi32(r0_1, _MM_SHUFFLE(0, 3, 2, 1));
r0_2 = _mm_shuffle_epi32(r0_2, _MM_SHUFFLE(1, 0, 3, 2));
r0_3 = _mm_shuffle_epi32(r0_3, _MM_SHUFFLE(2, 1, 0, 3));
r1_1 = _mm_shuffle_epi32(r1_1, _MM_SHUFFLE(0, 3, 2, 1));
r1_2 = _mm_shuffle_epi32(r1_2, _MM_SHUFFLE(1, 0, 3, 2));
r1_3 = _mm_shuffle_epi32(r1_3, _MM_SHUFFLE(2, 1, 0, 3));
r2_1 = _mm_shuffle_epi32(r2_1, _MM_SHUFFLE(0, 3, 2, 1));
r2_2 = _mm_shuffle_epi32(r2_2, _MM_SHUFFLE(1, 0, 3, 2));
r2_3 = _mm_shuffle_epi32(r2_3, _MM_SHUFFLE(2, 1, 0, 3));
r3_1 = _mm_shuffle_epi32(r3_1, _MM_SHUFFLE(0, 3, 2, 1));
r3_2 = _mm_shuffle_epi32(r3_2, _MM_SHUFFLE(1, 0, 3, 2));
r3_3 = _mm_shuffle_epi32(r3_3, _MM_SHUFFLE(2, 1, 0, 3));
r0_0 = _mm_add_epi32(r0_0, r0_1);
r1_0 = _mm_add_epi32(r1_0, r1_1);
r2_0 = _mm_add_epi32(r2_0, r2_1);
r3_0 = _mm_add_epi32(r3_0, r3_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r1_3 = _mm_xor_si128(r1_3, r1_0);
r2_3 = _mm_xor_si128(r2_3, r2_0);
r3_3 = _mm_xor_si128(r3_3, r3_0);
r0_3 = RotateLeft16(r0_3);
r1_3 = RotateLeft16(r1_3);
r2_3 = RotateLeft16(r2_3);
r3_3 = RotateLeft16(r3_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r1_2 = _mm_add_epi32(r1_2, r1_3);
r2_2 = _mm_add_epi32(r2_2, r2_3);
r3_2 = _mm_add_epi32(r3_2, r3_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r1_1 = _mm_xor_si128(r1_1, r1_2);
r2_1 = _mm_xor_si128(r2_1, r2_2);
r3_1 = _mm_xor_si128(r3_1, r3_2);
r0_1 = RotateLeft12(r0_1);
r1_1 = RotateLeft12(r1_1);
r2_1 = RotateLeft12(r2_1);
r3_1 = RotateLeft12(r3_1);
r0_0 = _mm_add_epi32(r0_0, r0_1);
r1_0 = _mm_add_epi32(r1_0, r1_1);
r2_0 = _mm_add_epi32(r2_0, r2_1);
r3_0 = _mm_add_epi32(r3_0, r3_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r1_3 = _mm_xor_si128(r1_3, r1_0);
r2_3 = _mm_xor_si128(r2_3, r2_0);
r3_3 = _mm_xor_si128(r3_3, r3_0);
r0_3 = RotateLeft8(r0_3);
r1_3 = RotateLeft8(r1_3);
r2_3 = RotateLeft8(r2_3);
r3_3 = RotateLeft8(r3_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r1_2 = _mm_add_epi32(r1_2, r1_3);
r2_2 = _mm_add_epi32(r2_2, r2_3);
r3_2 = _mm_add_epi32(r3_2, r3_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r1_1 = _mm_xor_si128(r1_1, r1_2);
r2_1 = _mm_xor_si128(r2_1, r2_2);
r3_1 = _mm_xor_si128(r3_1, r3_2);
r0_1 = RotateLeft7(r0_1);
r1_1 = RotateLeft7(r1_1);
r2_1 = RotateLeft7(r2_1);
r3_1 = RotateLeft7(r3_1);
r0_1 = _mm_shuffle_epi32(r0_1, _MM_SHUFFLE(2, 1, 0, 3));
r0_2 = _mm_shuffle_epi32(r0_2, _MM_SHUFFLE(1, 0, 3, 2));
r0_3 = _mm_shuffle_epi32(r0_3, _MM_SHUFFLE(0, 3, 2, 1));
r1_1 = _mm_shuffle_epi32(r1_1, _MM_SHUFFLE(2, 1, 0, 3));
r1_2 = _mm_shuffle_epi32(r1_2, _MM_SHUFFLE(1, 0, 3, 2));
r1_3 = _mm_shuffle_epi32(r1_3, _MM_SHUFFLE(0, 3, 2, 1));
r2_1 = _mm_shuffle_epi32(r2_1, _MM_SHUFFLE(2, 1, 0, 3));
r2_2 = _mm_shuffle_epi32(r2_2, _MM_SHUFFLE(1, 0, 3, 2));
r2_3 = _mm_shuffle_epi32(r2_3, _MM_SHUFFLE(0, 3, 2, 1));
r3_1 = _mm_shuffle_epi32(r3_1, _MM_SHUFFLE(2, 1, 0, 3));
r3_2 = _mm_shuffle_epi32(r3_2, _MM_SHUFFLE(1, 0, 3, 2));
r3_3 = _mm_shuffle_epi32(r3_3, _MM_SHUFFLE(0, 3, 2, 1));
}
r0_0 = _mm_add_epi32(r0_0, state0);
r0_1 = _mm_add_epi32(r0_1, state1);
r0_2 = _mm_add_epi32(r0_2, state2);
r0_3 = _mm_add_epi32(r0_3, state3);
r1_0 = _mm_add_epi32(r1_0, state0);
r1_1 = _mm_add_epi32(r1_1, state1);
r1_2 = _mm_add_epi32(r1_2, state2);
r1_3 = _mm_add_epi32(r1_3, state3);
r1_3 = _mm_add_epi64(r1_3, _mm_set_epi32(0, 0, 0, 1));
r2_0 = _mm_add_epi32(r2_0, state0);
r2_1 = _mm_add_epi32(r2_1, state1);
r2_2 = _mm_add_epi32(r2_2, state2);
r2_3 = _mm_add_epi32(r2_3, state3);
r2_3 = _mm_add_epi64(r2_3, _mm_set_epi32(0, 0, 0, 2));
r3_0 = _mm_add_epi32(r3_0, state0);
r3_1 = _mm_add_epi32(r3_1, state1);
r3_2 = _mm_add_epi32(r3_2, state2);
r3_3 = _mm_add_epi32(r3_3, state3);
r3_3 = _mm_add_epi64(r3_3, _mm_set_epi32(0, 0, 0, 3));
if (In)
{
_mm_storeu_si128((__m128i*)(CurrentOut + 0 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 0 * 16)), r0_0));
_mm_storeu_si128((__m128i*)(CurrentOut + 1 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 1 * 16)), r0_1));
_mm_storeu_si128((__m128i*)(CurrentOut + 2 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 2 * 16)), r0_2));
_mm_storeu_si128((__m128i*)(CurrentOut + 3 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 3 * 16)), r0_3));
_mm_storeu_si128((__m128i*)(CurrentOut + 4 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 4 * 16)), r1_0));
_mm_storeu_si128((__m128i*)(CurrentOut + 5 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 5 * 16)), r1_1));
_mm_storeu_si128((__m128i*)(CurrentOut + 6 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 6 * 16)), r1_2));
_mm_storeu_si128((__m128i*)(CurrentOut + 7 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 7 * 16)), r1_3));
_mm_storeu_si128((__m128i*)(CurrentOut + 8 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 8 * 16)), r2_0));
_mm_storeu_si128((__m128i*)(CurrentOut + 9 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 9 * 16)), r2_1));
_mm_storeu_si128((__m128i*)(CurrentOut + 10 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 10 * 16)), r2_2));
_mm_storeu_si128((__m128i*)(CurrentOut + 11 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 11 * 16)), r2_3));
_mm_storeu_si128((__m128i*)(CurrentOut + 12 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 12 * 16)), r3_0));
_mm_storeu_si128((__m128i*)(CurrentOut + 13 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 13 * 16)), r3_1));
_mm_storeu_si128((__m128i*)(CurrentOut + 14 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 14 * 16)), r3_2));
_mm_storeu_si128((__m128i*)(CurrentOut + 15 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 15 * 16)), r3_3));
CurrentIn += 256;
}
else
{
_mm_storeu_si128((__m128i*)(CurrentOut + 0 * 16), r0_0);
_mm_storeu_si128((__m128i*)(CurrentOut + 1 * 16), r0_1);
_mm_storeu_si128((__m128i*)(CurrentOut + 2 * 16), r0_2);
_mm_storeu_si128((__m128i*)(CurrentOut + 3 * 16), r0_3);
_mm_storeu_si128((__m128i*)(CurrentOut + 4 * 16), r1_0);
_mm_storeu_si128((__m128i*)(CurrentOut + 5 * 16), r1_1);
_mm_storeu_si128((__m128i*)(CurrentOut + 6 * 16), r1_2);
_mm_storeu_si128((__m128i*)(CurrentOut + 7 * 16), r1_3);
_mm_storeu_si128((__m128i*)(CurrentOut + 8 * 16), r2_0);
_mm_storeu_si128((__m128i*)(CurrentOut + 9 * 16), r2_1);
_mm_storeu_si128((__m128i*)(CurrentOut + 10 * 16), r2_2);
_mm_storeu_si128((__m128i*)(CurrentOut + 11 * 16), r2_3);
_mm_storeu_si128((__m128i*)(CurrentOut + 12 * 16), r3_0);
_mm_storeu_si128((__m128i*)(CurrentOut + 13 * 16), r3_1);
_mm_storeu_si128((__m128i*)(CurrentOut + 14 * 16), r3_2);
_mm_storeu_si128((__m128i*)(CurrentOut + 15 * 16), r3_3);
}
CurrentOut += 256;
ChaCha20AddCounter(state, 4);
}
if (RemainingBytes == 0) return;
while(1)
{
const __m128i state3 = _mm_loadu_si128((const __m128i*)((state)+32));
__m128i r0_0 = state0;
__m128i r0_1 = state1;
__m128i r0_2 = state2;
__m128i r0_3 = state3;
for (int i = 20; i > 0; i -= 2)
{
r0_0 = _mm_add_epi32(r0_0, r0_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r0_3 = RotateLeft16(r0_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r0_1 = RotateLeft12(r0_1);
r0_0 = _mm_add_epi32(r0_0, r0_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r0_3 = RotateLeft8(r0_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r0_1 = RotateLeft7(r0_1);
r0_1 = _mm_shuffle_epi32(r0_1, _MM_SHUFFLE(0, 3, 2, 1));
r0_2 = _mm_shuffle_epi32(r0_2, _MM_SHUFFLE(1, 0, 3, 2));
r0_3 = _mm_shuffle_epi32(r0_3, _MM_SHUFFLE(2, 1, 0, 3));
r0_0 = _mm_add_epi32(r0_0, r0_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r0_3 = RotateLeft16(r0_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r0_1 = RotateLeft12(r0_1);
r0_0 = _mm_add_epi32(r0_0, r0_1);
r0_3 = _mm_xor_si128(r0_3, r0_0);
r0_3 = RotateLeft8(r0_3);
r0_2 = _mm_add_epi32(r0_2, r0_3);
r0_1 = _mm_xor_si128(r0_1, r0_2);
r0_1 = RotateLeft7(r0_1);
r0_1 = _mm_shuffle_epi32(r0_1, _MM_SHUFFLE(2, 1, 0, 3));
r0_2 = _mm_shuffle_epi32(r0_2, _MM_SHUFFLE(1, 0, 3, 2));
r0_3 = _mm_shuffle_epi32(r0_3, _MM_SHUFFLE(0, 3, 2, 1));
}
r0_0 = _mm_add_epi32(r0_0, state0);
r0_1 = _mm_add_epi32(r0_1, state1);
r0_2 = _mm_add_epi32(r0_2, state2);
r0_3 = _mm_add_epi32(r0_3, state3);
if (RemainingBytes>=64)
{
if (In)
{
_mm_storeu_si128((__m128i*)(CurrentOut + 0 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 0 * 16)), r0_0));
_mm_storeu_si128((__m128i*)(CurrentOut + 1 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 1 * 16)), r0_1));
_mm_storeu_si128((__m128i*)(CurrentOut + 2 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 2 * 16)), r0_2));
_mm_storeu_si128((__m128i*)(CurrentOut + 3 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(CurrentIn + 3 * 16)), r0_3));
CurrentIn += 64;
}
else
{
_mm_storeu_si128((__m128i*)(CurrentOut + 0 * 16), r0_0);
_mm_storeu_si128((__m128i*)(CurrentOut + 1 * 16), r0_1);
_mm_storeu_si128((__m128i*)(CurrentOut + 2 * 16), r0_2);
_mm_storeu_si128((__m128i*)(CurrentOut + 3 * 16), r0_3);
}
CurrentOut += 64;
ChaCha20AddCounter(state, 1);
RemainingBytes -= 64;
if (RemainingBytes == 0) return;
continue;
}
else
{
_Alignas(16) uint8_t TmpBuf[64];
if (In)
{
memcpy(TmpBuf, CurrentIn, RemainingBytes);
_mm_storeu_si128((__m128i*)(TmpBuf + 0 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(TmpBuf + 0 * 16)), r0_0));
_mm_storeu_si128((__m128i*)(TmpBuf + 1 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(TmpBuf + 1 * 16)), r0_1));
_mm_storeu_si128((__m128i*)(TmpBuf + 2 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(TmpBuf + 2 * 16)), r0_2));
_mm_storeu_si128((__m128i*)(TmpBuf + 3 * 16), _mm_xor_si128(_mm_loadu_si128((const __m128i*)(TmpBuf + 3 * 16)), r0_3));
}
else
{
_mm_storeu_si128((__m128i*)(TmpBuf + 0 * 16), r0_0);
_mm_storeu_si128((__m128i*)(TmpBuf + 1 * 16), r0_1);
_mm_storeu_si128((__m128i*)(TmpBuf + 2 * 16), r0_2);
_mm_storeu_si128((__m128i*)(TmpBuf + 3 * 16), r0_3);
}
memcpy(CurrentOut, TmpBuf, RemainingBytes);
ChaCha20AddCounter(state, 1);
return;
}
}
}
#endif