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chacha20_avx2.c
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#include "chacha20.h"
#include <immintrin.h>
#include <memory.h>
#if defined(USE_AVX2)
inline void PartialXor(const __m256i val, const uint8_t* Src, uint8_t* Dest, uint64_t Size)
{
_Alignas(32) uint8_t BuffForPartialOp[32];
memcpy(BuffForPartialOp, Src, Size);
_mm256_storeu_si256((__m256i*)(BuffForPartialOp), _mm256_xor_si256(val, _mm256_loadu_si256((const __m256i*)BuffForPartialOp)));
memcpy(Dest, BuffForPartialOp, Size);
}
inline void PartialStore(const __m256i val, uint8_t* Dest, uint64_t Size)
{
_Alignas(32) uint8_t BuffForPartialOp[32];
_mm256_storeu_si256((__m256i*)(BuffForPartialOp), val);
memcpy(Dest, BuffForPartialOp, Size);
}
inline __m256i RotateLeft7(const __m256i val) {
return _mm256_or_si256(_mm256_slli_epi32(val, 7),
_mm256_srli_epi32(val, 32 - 7));
}
inline __m256i RotateLeft12(const __m256i val) {
return _mm256_or_si256(_mm256_slli_epi32(val, 12),
_mm256_srli_epi32(val, 32 - 12));
}
inline __m256i RotateLeft8(const __m256i val) {
const __m256i mask =
_mm256_set_epi8(14, 13, 12, 15, 10, 9, 8, 11, 6, 5, 4, 7, 2, 1, 0, 3, 14,
13, 12, 15, 10, 9, 8, 11, 6, 5, 4, 7, 2, 1, 0, 3);
return _mm256_shuffle_epi8(val, mask);
}
inline __m256i RotateLeft16(const __m256i val) {
const __m256i mask =
_mm256_set_epi8(13, 12, 15, 14, 9, 8, 11, 10, 5, 4, 7, 6, 1, 0, 3, 2, 13,
12, 15, 14, 9, 8, 11, 10, 5, 4, 7, 6, 1, 0, 3, 2);
return _mm256_shuffle_epi8(val, mask);
}
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 / 512;
uint64_t RemainingBytes = Size % 512;
const __m256i state0 = _mm256_broadcastsi128_si256(_mm_set_epi32(1797285236, 2036477234, 857760878, 1634760805)); //"expand 32-byte k"
const __m256i state1 = _mm256_broadcastsi128_si256(_mm_load_si128((const __m128i*)(state)));
const __m256i state2 = _mm256_broadcastsi128_si256(_mm_load_si128((const __m128i*)(state + 16)));
__m256i CTR0 = _mm256_set_epi32(0, 0, 0, 0, 0, 0, 0, 4);
const __m256i CTR1 = _mm256_set_epi32(0, 0, 0, 1, 0, 0, 0, 5);
const __m256i CTR2 = _mm256_set_epi32(0, 0, 0, 2, 0, 0, 0, 6);
const __m256i CTR3 = _mm256_set_epi32(0, 0, 0, 3, 0, 0, 0, 7);
for (int64_t n = 0; n < FullBlocksCount; n++)
{
const __m256i state3 = _mm256_broadcastsi128_si256(
_mm_load_si128((const __m128i*)(state + 32)));
__m256i X0_0 = state0;
__m256i X0_1 = state1;
__m256i X0_2 = state2;
__m256i X0_3 = _mm256_add_epi32(state3, CTR0);
__m256i X1_0 = state0;
__m256i X1_1 = state1;
__m256i X1_2 = state2;
__m256i X1_3 = _mm256_add_epi32(state3, CTR1);
__m256i X2_0 = state0;
__m256i X2_1 = state1;
__m256i X2_2 = state2;
__m256i X2_3 = _mm256_add_epi32(state3, CTR2);
__m256i X3_0 = state0;
__m256i X3_1 = state1;
__m256i X3_2 = state2;
__m256i X3_3 = _mm256_add_epi32(state3, CTR3);
for (int i = 20; i > 0; i -= 2)
{
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X1_0 = _mm256_add_epi32(X1_0, X1_1);
X2_0 = _mm256_add_epi32(X2_0, X2_1);
X3_0 = _mm256_add_epi32(X3_0, X3_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X1_3 = _mm256_xor_si256(X1_3, X1_0);
X2_3 = _mm256_xor_si256(X2_3, X2_0);
X3_3 = _mm256_xor_si256(X3_3, X3_0);
X0_3 = RotateLeft16(X0_3);
X1_3 = RotateLeft16(X1_3);
X2_3 = RotateLeft16(X2_3);
X3_3 = RotateLeft16(X3_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X1_2 = _mm256_add_epi32(X1_2, X1_3);
X2_2 = _mm256_add_epi32(X2_2, X2_3);
X3_2 = _mm256_add_epi32(X3_2, X3_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X1_1 = _mm256_xor_si256(X1_1, X1_2);
X2_1 = _mm256_xor_si256(X2_1, X2_2);
X3_1 = _mm256_xor_si256(X3_1, X3_2);
X0_1 = RotateLeft12(X0_1);
X1_1 = RotateLeft12(X1_1);
X2_1 = RotateLeft12(X2_1);
X3_1 = RotateLeft12(X3_1);
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X1_0 = _mm256_add_epi32(X1_0, X1_1);
X2_0 = _mm256_add_epi32(X2_0, X2_1);
X3_0 = _mm256_add_epi32(X3_0, X3_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X1_3 = _mm256_xor_si256(X1_3, X1_0);
X2_3 = _mm256_xor_si256(X2_3, X2_0);
X3_3 = _mm256_xor_si256(X3_3, X3_0);
X0_3 = RotateLeft8(X0_3);
X1_3 = RotateLeft8(X1_3);
X2_3 = RotateLeft8(X2_3);
X3_3 = RotateLeft8(X3_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X1_2 = _mm256_add_epi32(X1_2, X1_3);
X2_2 = _mm256_add_epi32(X2_2, X2_3);
X3_2 = _mm256_add_epi32(X3_2, X3_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X1_1 = _mm256_xor_si256(X1_1, X1_2);
X2_1 = _mm256_xor_si256(X2_1, X2_2);
X3_1 = _mm256_xor_si256(X3_1, X3_2);
X0_1 = RotateLeft7(X0_1);
X1_1 = RotateLeft7(X1_1);
X2_1 = RotateLeft7(X2_1);
X3_1 = RotateLeft7(X3_1);
X0_1 = _mm256_shuffle_epi32(X0_1, _MM_SHUFFLE(0, 3, 2, 1));
X0_2 = _mm256_shuffle_epi32(X0_2, _MM_SHUFFLE(1, 0, 3, 2));
X0_3 = _mm256_shuffle_epi32(X0_3, _MM_SHUFFLE(2, 1, 0, 3));
X1_1 = _mm256_shuffle_epi32(X1_1, _MM_SHUFFLE(0, 3, 2, 1));
X1_2 = _mm256_shuffle_epi32(X1_2, _MM_SHUFFLE(1, 0, 3, 2));
X1_3 = _mm256_shuffle_epi32(X1_3, _MM_SHUFFLE(2, 1, 0, 3));
X2_1 = _mm256_shuffle_epi32(X2_1, _MM_SHUFFLE(0, 3, 2, 1));
X2_2 = _mm256_shuffle_epi32(X2_2, _MM_SHUFFLE(1, 0, 3, 2));
X2_3 = _mm256_shuffle_epi32(X2_3, _MM_SHUFFLE(2, 1, 0, 3));
X3_1 = _mm256_shuffle_epi32(X3_1, _MM_SHUFFLE(0, 3, 2, 1));
X3_2 = _mm256_shuffle_epi32(X3_2, _MM_SHUFFLE(1, 0, 3, 2));
X3_3 = _mm256_shuffle_epi32(X3_3, _MM_SHUFFLE(2, 1, 0, 3));
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X1_0 = _mm256_add_epi32(X1_0, X1_1);
X2_0 = _mm256_add_epi32(X2_0, X2_1);
X3_0 = _mm256_add_epi32(X3_0, X3_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X1_3 = _mm256_xor_si256(X1_3, X1_0);
X2_3 = _mm256_xor_si256(X2_3, X2_0);
X3_3 = _mm256_xor_si256(X3_3, X3_0);
X0_3 = RotateLeft16(X0_3);
X1_3 = RotateLeft16(X1_3);
X2_3 = RotateLeft16(X2_3);
X3_3 = RotateLeft16(X3_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X1_2 = _mm256_add_epi32(X1_2, X1_3);
X2_2 = _mm256_add_epi32(X2_2, X2_3);
X3_2 = _mm256_add_epi32(X3_2, X3_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X1_1 = _mm256_xor_si256(X1_1, X1_2);
X2_1 = _mm256_xor_si256(X2_1, X2_2);
X3_1 = _mm256_xor_si256(X3_1, X3_2);
X0_1 = RotateLeft12(X0_1);
X1_1 = RotateLeft12(X1_1);
X2_1 = RotateLeft12(X2_1);
X3_1 = RotateLeft12(X3_1);
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X1_0 = _mm256_add_epi32(X1_0, X1_1);
X2_0 = _mm256_add_epi32(X2_0, X2_1);
X3_0 = _mm256_add_epi32(X3_0, X3_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X1_3 = _mm256_xor_si256(X1_3, X1_0);
X2_3 = _mm256_xor_si256(X2_3, X2_0);
X3_3 = _mm256_xor_si256(X3_3, X3_0);
X0_3 = RotateLeft8(X0_3);
X1_3 = RotateLeft8(X1_3);
X2_3 = RotateLeft8(X2_3);
X3_3 = RotateLeft8(X3_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X1_2 = _mm256_add_epi32(X1_2, X1_3);
X2_2 = _mm256_add_epi32(X2_2, X2_3);
X3_2 = _mm256_add_epi32(X3_2, X3_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X1_1 = _mm256_xor_si256(X1_1, X1_2);
X2_1 = _mm256_xor_si256(X2_1, X2_2);
X3_1 = _mm256_xor_si256(X3_1, X3_2);
X0_1 = RotateLeft7(X0_1);
X1_1 = RotateLeft7(X1_1);
X2_1 = RotateLeft7(X2_1);
X3_1 = RotateLeft7(X3_1);
X0_1 = _mm256_shuffle_epi32(X0_1, _MM_SHUFFLE(2, 1, 0, 3));
X0_2 = _mm256_shuffle_epi32(X0_2, _MM_SHUFFLE(1, 0, 3, 2));
X0_3 = _mm256_shuffle_epi32(X0_3, _MM_SHUFFLE(0, 3, 2, 1));
X1_1 = _mm256_shuffle_epi32(X1_1, _MM_SHUFFLE(2, 1, 0, 3));
X1_2 = _mm256_shuffle_epi32(X1_2, _MM_SHUFFLE(1, 0, 3, 2));
X1_3 = _mm256_shuffle_epi32(X1_3, _MM_SHUFFLE(0, 3, 2, 1));
X2_1 = _mm256_shuffle_epi32(X2_1, _MM_SHUFFLE(2, 1, 0, 3));
X2_2 = _mm256_shuffle_epi32(X2_2, _MM_SHUFFLE(1, 0, 3, 2));
X2_3 = _mm256_shuffle_epi32(X2_3, _MM_SHUFFLE(0, 3, 2, 1));
X3_1 = _mm256_shuffle_epi32(X3_1, _MM_SHUFFLE(2, 1, 0, 3));
X3_2 = _mm256_shuffle_epi32(X3_2, _MM_SHUFFLE(1, 0, 3, 2));
X3_3 = _mm256_shuffle_epi32(X3_3, _MM_SHUFFLE(0, 3, 2, 1));
}
X0_0 = _mm256_add_epi32(X0_0, state0);
X0_1 = _mm256_add_epi32(X0_1, state1);
X0_2 = _mm256_add_epi32(X0_2, state2);
X0_3 = _mm256_add_epi32(X0_3, state3);
X0_3 = _mm256_add_epi32(X0_3, CTR0);
X1_0 = _mm256_add_epi32(X1_0, state0);
X1_1 = _mm256_add_epi32(X1_1, state1);
X1_2 = _mm256_add_epi32(X1_2, state2);
X1_3 = _mm256_add_epi32(X1_3, state3);
X1_3 = _mm256_add_epi32(X1_3, CTR1);
X2_0 = _mm256_add_epi32(X2_0, state0);
X2_1 = _mm256_add_epi32(X2_1, state1);
X2_2 = _mm256_add_epi32(X2_2, state2);
X2_3 = _mm256_add_epi32(X2_3, state3);
X2_3 = _mm256_add_epi32(X2_3, CTR2);
X3_0 = _mm256_add_epi32(X3_0, state0);
X3_1 = _mm256_add_epi32(X3_1, state1);
X3_2 = _mm256_add_epi32(X3_2, state2);
X3_3 = _mm256_add_epi32(X3_3, state3);
X3_3 = _mm256_add_epi32(X3_3, CTR3);
//
if (In)
{
_mm256_storeu_si256((__m256i*)(CurrentOut + 0 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_0, X0_1, 1 + (3 << 4)),
_mm256_loadu_si256((__m256i*)(CurrentIn + 0 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 1 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_2, X0_3, 1 + (3 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 1 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 2 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X1_0, X1_1, 1 + (3 << 4)),
_mm256_loadu_si256(((const __m256i*)(CurrentIn + 2 * 32)))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 3 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X1_2, X1_3, 1 + (3 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 3 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 4 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X2_0, X2_1, 1 + (3 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 4 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 5 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X2_2, X2_3, 1 + (3 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 5 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 6 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X3_0, X3_1, 1 + (3 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 6 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 7 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X3_2, X3_3, 1 + (3 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 7 * 32))));
_mm256_storeu_si256(
(__m256i*)(CurrentOut + 8 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_0, X0_1, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 8 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 9 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_2, X0_3, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 9 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 10 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X1_0, X1_1, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 10 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 11 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X1_2, X1_3, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 11 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 12 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X2_0, X2_1, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 12 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 13 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X2_2, X2_3, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 13 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 14 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X3_0, X3_1, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 14 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 15 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X3_2, X3_3, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 15 * 32))));
}
else
{
_mm256_storeu_si256((__m256i*)(CurrentOut + 0 * 32),
_mm256_permute2x128_si256(X0_0, X0_1, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 1 * 32),
_mm256_permute2x128_si256(X0_2, X0_3, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 2 * 32),
_mm256_permute2x128_si256(X1_0, X1_1, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 3 * 32),
_mm256_permute2x128_si256(X1_2, X1_3, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 4 * 32),
_mm256_permute2x128_si256(X2_0, X2_1, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 5 * 32),
_mm256_permute2x128_si256(X2_2, X2_3, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 6 * 32),
_mm256_permute2x128_si256(X3_0, X3_1, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 7 * 32),
_mm256_permute2x128_si256(X3_2, X3_3, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 8 * 32),
_mm256_permute2x128_si256(X0_0, X0_1, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 9 * 32),
_mm256_permute2x128_si256(X0_2, X0_3, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 10 * 32),
_mm256_permute2x128_si256(X1_0, X1_1, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 11 * 32),
_mm256_permute2x128_si256(X1_2, X1_3, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 12 * 32),
_mm256_permute2x128_si256(X2_0, X2_1, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 13 * 32),
_mm256_permute2x128_si256(X2_2, X2_3, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 14 * 32),
_mm256_permute2x128_si256(X3_0, X3_1, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 15 * 32),
_mm256_permute2x128_si256(X3_2, X3_3, 0 + (2 << 4)));
}
ChaCha20AddCounter(state, 8);
if (CurrentIn)
CurrentIn += 512;
CurrentOut += 512;
}
if (RemainingBytes == 0) return;
CTR0 = _mm256_set_epi32(0, 0, 0, 0, 0, 0, 0, 1);
while (1)
{
const __m256i state3 = _mm256_broadcastsi128_si256(
_mm_load_si128((const __m128i*)(state + 32)));
__m256i X0_0 = state0;
__m256i X0_1 = state1;
__m256i X0_2 = state2;
__m256i X0_3 = _mm256_add_epi32(state3, CTR0);
for (int i = 20; i > 0; i -= 2)
{
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X0_3 = RotateLeft16(X0_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X0_1 = RotateLeft12(X0_1);
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X0_3 = RotateLeft8(X0_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X0_1 = RotateLeft7(X0_1);
X0_1 = _mm256_shuffle_epi32(X0_1, _MM_SHUFFLE(0, 3, 2, 1));
X0_2 = _mm256_shuffle_epi32(X0_2, _MM_SHUFFLE(1, 0, 3, 2));
X0_3 = _mm256_shuffle_epi32(X0_3, _MM_SHUFFLE(2, 1, 0, 3));
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X0_3 = RotateLeft16(X0_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X0_1 = RotateLeft12(X0_1);
X0_0 = _mm256_add_epi32(X0_0, X0_1);
X0_3 = _mm256_xor_si256(X0_3, X0_0);
X0_3 = RotateLeft8(X0_3);
X0_2 = _mm256_add_epi32(X0_2, X0_3);
X0_1 = _mm256_xor_si256(X0_1, X0_2);
X0_1 = RotateLeft7(X0_1);
X0_1 = _mm256_shuffle_epi32(X0_1, _MM_SHUFFLE(2, 1, 0, 3));
X0_2 = _mm256_shuffle_epi32(X0_2, _MM_SHUFFLE(1, 0, 3, 2));
X0_3 = _mm256_shuffle_epi32(X0_3, _MM_SHUFFLE(0, 3, 2, 1));
}
X0_0 = _mm256_add_epi32(X0_0, state0);
X0_1 = _mm256_add_epi32(X0_1, state1);
X0_2 = _mm256_add_epi32(X0_2, state2);
X0_3 = _mm256_add_epi32(X0_3, state3);
X0_3 = _mm256_add_epi32(X0_3, CTR0);
//todo
if (RemainingBytes >= 128)
{
if (In)
{
_mm256_storeu_si256((__m256i*)(CurrentOut + 0 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_0, X0_1, 1 + (3 << 4)),
_mm256_loadu_si256((__m256i*)(CurrentIn + 0 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 1 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_2, X0_3, 1 + (3 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 1 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 2 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_0, X0_1, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 2 * 32))));
_mm256_storeu_si256((__m256i*)(CurrentOut + 3 * 32),
_mm256_xor_si256(_mm256_permute2x128_si256(X0_2, X0_3, 0 + (2 << 4)),
_mm256_loadu_si256((const __m256i*)(CurrentIn + 3 * 32))));
}
else
{
_mm256_storeu_si256((__m256i*)(CurrentOut + 0 * 32),
_mm256_permute2x128_si256(X0_0, X0_1, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 1 * 32),
_mm256_permute2x128_si256(X0_2, X0_3, 1 + (3 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 2 * 32),
_mm256_permute2x128_si256(X0_0, X0_1, 0 + (2 << 4)));
_mm256_storeu_si256((__m256i*)(CurrentOut + 3 * 32),
_mm256_permute2x128_si256(X0_2, X0_3, 0 + (2 << 4)));
}
ChaCha20AddCounter(state, 2);
RemainingBytes -= 128;
if (RemainingBytes == 0) return;
if (CurrentIn)
CurrentIn += 128;
CurrentOut += 128;
continue;
}
else //last, partial block
{
__m256i tmp;
if (In) // encrypt
{
tmp = _mm256_permute2x128_si256(X0_0, X0_1, 1 + (3 << 4));
if (RemainingBytes < 32)
{
PartialXor(tmp, CurrentIn, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 1);
return;
}
_mm256_storeu_si256((__m256i*)(CurrentOut), _mm256_xor_si256(tmp, _mm256_loadu_si256((const __m256i*)(CurrentIn))));
RemainingBytes -= 32;
if (RemainingBytes == 0)
{
ChaCha20AddCounter(state, 1);
return;
}
CurrentIn += 32;
CurrentOut += 32;
tmp = _mm256_permute2x128_si256(X0_2, X0_3, 1 + (3 << 4));
if (RemainingBytes < 32)
{
PartialXor(tmp, CurrentIn, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 1);
return;
}
_mm256_storeu_si256((__m256i*)(CurrentOut), _mm256_xor_si256(tmp, _mm256_loadu_si256((const __m256i*)(CurrentIn))));
RemainingBytes -= 32;
if (RemainingBytes == 0)
{
ChaCha20AddCounter(state, 1);
return;
}
CurrentIn += 32;
CurrentOut += 32;
tmp = _mm256_permute2x128_si256(X0_0, X0_1, 0 + (2 << 4));
if (RemainingBytes < 32)
{
PartialXor(tmp, CurrentIn, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 2);
return;
}
_mm256_storeu_si256((__m256i*)(CurrentOut), _mm256_xor_si256(tmp, _mm256_loadu_si256((const __m256i*)(CurrentIn))));
RemainingBytes -= 32;
if (RemainingBytes == 0)
{
ChaCha20AddCounter(state, 2);
return;
}
CurrentIn += 32;
CurrentOut += 32;
tmp = _mm256_permute2x128_si256(X0_2, X0_3, 0 + (2 << 4));
PartialXor(tmp, CurrentIn, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 2);
return;
}
else
{
tmp = _mm256_permute2x128_si256(X0_0, X0_1, 1 + (3 << 4));
if (RemainingBytes < 32)
{
PartialStore(tmp, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 1);
return;
}
_mm256_storeu_si256((__m256i*)(CurrentOut), tmp);
RemainingBytes -= 32;
if (RemainingBytes == 0)
{
ChaCha20AddCounter(state, 1);
return;
}
CurrentOut += 32;
tmp = _mm256_permute2x128_si256(X0_2, X0_3, 1 + (3 << 4));
if (RemainingBytes < 32)
{
PartialStore(tmp, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 1);
return;
}
_mm256_storeu_si256((__m256i*)(CurrentOut), tmp);
RemainingBytes -= 32;
if (RemainingBytes == 0)
{
ChaCha20AddCounter(state, 1);
return;
}
CurrentOut += 32;
tmp = _mm256_permute2x128_si256(X0_0, X0_1, 0 + (2 << 4));
if (RemainingBytes < 32)
{
PartialStore(tmp, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 2);
return;
}
_mm256_storeu_si256((__m256i*)(CurrentOut), tmp);
RemainingBytes -= 32;
if (RemainingBytes == 0)
{
ChaCha20AddCounter(state, 2);
return;
}
CurrentOut += 32;
tmp = _mm256_permute2x128_si256(X0_2, X0_3, 0 + (2 << 4));
PartialStore(tmp, CurrentOut, RemainingBytes);
ChaCha20AddCounter(state, 2);
return;
}
}
}
}
#endif