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/*
* SSE2 ChaCha
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/chacha.h>
#include <emmintrin.h>
namespace Botan {
//static
BOTAN_FUNC_ISA("sse2")
void ChaCha::chacha_sse2_x4(uint8_t output[64*4], uint32_t input[16], size_t rounds)
{
BOTAN_ASSERT(rounds % 2 == 0, "Valid rounds");
const __m128i* input_mm = reinterpret_cast<const __m128i*>(input);
__m128i* output_mm = reinterpret_cast<__m128i*>(output);
__m128i input0 = _mm_loadu_si128(input_mm);
__m128i input1 = _mm_loadu_si128(input_mm + 1);
__m128i input2 = _mm_loadu_si128(input_mm + 2);
__m128i input3 = _mm_loadu_si128(input_mm + 3);
// TODO: try transposing, which would avoid the permutations each round
#define mm_rotl(r, n) \
_mm_or_si128(_mm_slli_epi32(r, n), _mm_srli_epi32(r, 32-n))
__m128i r0_0 = input0;
__m128i r0_1 = input1;
__m128i r0_2 = input2;
__m128i r0_3 = input3;
__m128i r1_0 = input0;
__m128i r1_1 = input1;
__m128i r1_2 = input2;
__m128i r1_3 = _mm_add_epi64(r0_3, _mm_set_epi32(0, 0, 0, 1));
__m128i r2_0 = input0;
__m128i r2_1 = input1;
__m128i r2_2 = input2;
__m128i r2_3 = _mm_add_epi64(r0_3, _mm_set_epi32(0, 0, 0, 2));
__m128i r3_0 = input0;
__m128i r3_1 = input1;
__m128i r3_2 = input2;
__m128i r3_3 = _mm_add_epi64(r0_3, _mm_set_epi32(0, 0, 0, 3));
for(size_t r = 0; r != rounds / 2; ++r)
{
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 = mm_rotl(r0_3, 16);
r1_3 = mm_rotl(r1_3, 16);
r2_3 = mm_rotl(r2_3, 16);
r3_3 = mm_rotl(r3_3, 16);
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 = mm_rotl(r0_1, 12);
r1_1 = mm_rotl(r1_1, 12);
r2_1 = mm_rotl(r2_1, 12);
r3_1 = mm_rotl(r3_1, 12);
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 = mm_rotl(r0_3, 8);
r1_3 = mm_rotl(r1_3, 8);
r2_3 = mm_rotl(r2_3, 8);
r3_3 = mm_rotl(r3_3, 8);
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 = mm_rotl(r0_1, 7);
r1_1 = mm_rotl(r1_1, 7);
r2_1 = mm_rotl(r2_1, 7);
r3_1 = mm_rotl(r3_1, 7);
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 = mm_rotl(r0_3, 16);
r1_3 = mm_rotl(r1_3, 16);
r2_3 = mm_rotl(r2_3, 16);
r3_3 = mm_rotl(r3_3, 16);
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 = mm_rotl(r0_1, 12);
r1_1 = mm_rotl(r1_1, 12);
r2_1 = mm_rotl(r2_1, 12);
r3_1 = mm_rotl(r3_1, 12);
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 = mm_rotl(r0_3, 8);
r1_3 = mm_rotl(r1_3, 8);
r2_3 = mm_rotl(r2_3, 8);
r3_3 = mm_rotl(r3_3, 8);
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 = mm_rotl(r0_1, 7);
r1_1 = mm_rotl(r1_1, 7);
r2_1 = mm_rotl(r2_1, 7);
r3_1 = mm_rotl(r3_1, 7);
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, input0);
r0_1 = _mm_add_epi32(r0_1, input1);
r0_2 = _mm_add_epi32(r0_2, input2);
r0_3 = _mm_add_epi32(r0_3, input3);
r1_0 = _mm_add_epi32(r1_0, input0);
r1_1 = _mm_add_epi32(r1_1, input1);
r1_2 = _mm_add_epi32(r1_2, input2);
r1_3 = _mm_add_epi32(r1_3, input3);
r1_3 = _mm_add_epi64(r1_3, _mm_set_epi32(0, 0, 0, 1));
r2_0 = _mm_add_epi32(r2_0, input0);
r2_1 = _mm_add_epi32(r2_1, input1);
r2_2 = _mm_add_epi32(r2_2, input2);
r2_3 = _mm_add_epi32(r2_3, input3);
r2_3 = _mm_add_epi64(r2_3, _mm_set_epi32(0, 0, 0, 2));
r3_0 = _mm_add_epi32(r3_0, input0);
r3_1 = _mm_add_epi32(r3_1, input1);
r3_2 = _mm_add_epi32(r3_2, input2);
r3_3 = _mm_add_epi32(r3_3, input3);
r3_3 = _mm_add_epi64(r3_3, _mm_set_epi32(0, 0, 0, 3));
_mm_storeu_si128(output_mm + 0, r0_0);
_mm_storeu_si128(output_mm + 1, r0_1);
_mm_storeu_si128(output_mm + 2, r0_2);
_mm_storeu_si128(output_mm + 3, r0_3);
_mm_storeu_si128(output_mm + 4, r1_0);
_mm_storeu_si128(output_mm + 5, r1_1);
_mm_storeu_si128(output_mm + 6, r1_2);
_mm_storeu_si128(output_mm + 7, r1_3);
_mm_storeu_si128(output_mm + 8, r2_0);
_mm_storeu_si128(output_mm + 9, r2_1);
_mm_storeu_si128(output_mm + 10, r2_2);
_mm_storeu_si128(output_mm + 11, r2_3);
_mm_storeu_si128(output_mm + 12, r3_0);
_mm_storeu_si128(output_mm + 13, r3_1);
_mm_storeu_si128(output_mm + 14, r3_2);
_mm_storeu_si128(output_mm + 15, r3_3);
#undef mm_rotl
input[12] += 4;
if(input[12] < 4)
input[13]++;
}
}
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