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branch: master
Paul Harris
88 lines (76 sloc) 2.766 kb
#include "siphash_impl.h"
/* 0,2,1,3 */
static const packedelem64 siphash_init[2] = {
{{0x736f6d6570736575ull,0x6c7967656e657261ull}},
{{0x646f72616e646f6dull,0x7465646279746573ull}}
};
static const packedelem64 siphash_final = {
{0x0000000000000000ull,0x00000000000000ffull}
};
static const packedelem8 siphash_rot16v3 = {
{14,15,8,9,10,11,12,13,8,9,10,11,12,13,14,15}
};
uint64_t
siphash(const unsigned char key[16], const unsigned char *m, size_t len) {
xmmi k,v02,v20,v13,v11,v33,mi;
uint64_t last7;
uint32_t lo, hi;
size_t i, blocks;
k = _mm_loadu_si128((xmmi *)(key + 0));
v02 = siphash_init[0].v;
v13 = siphash_init[1].v;
v02 = _mm_xor_si128(v02, _mm_unpacklo_epi64(k, k));
v13 = _mm_xor_si128(v13, _mm_unpackhi_epi64(k, k));
last7 = (uint64_t)(len & 0xff) << 56;
#define sipcompress() \
v11 = v13; \
v33 = v13; \
v11 = _mm_or_si128(_mm_slli_epi64(v11, 13), _mm_srli_epi64(v11, 64-13)); \
v02 = _mm_add_epi64(v02, v13); \
v33 = _mm_shuffle_epi8(v33, siphash_rot16v3.v); \
v13 = _mm_unpacklo_epi64(v11, v33); \
v13 = _mm_xor_si128(v13, v02); \
v20 = _mm_shuffle_epi32(v02, _MM_SHUFFLE(0,1,3,2)); \
v11 = v13; \
v33 = _mm_shuffle_epi32(v13, _MM_SHUFFLE(1,0,3,2)); \
v11 = _mm_or_si128(_mm_slli_epi64(v11, 17), _mm_srli_epi64(v11, 64-17)); \
v20 = _mm_add_epi64(v20, v13); \
v33 = _mm_or_si128(_mm_slli_epi64(v33, 21), _mm_srli_epi64(v33, 64-21)); \
v13 = _mm_unpacklo_epi64(v11, v33); \
v13 = _mm_unpacklo_epi64(v11, v33); \
v02 = _mm_shuffle_epi32(v20, _MM_SHUFFLE(0,1,3,2)); \
v13 = _mm_xor_si128(v13, v20);
for (i = 0, blocks = (len & ~7); i < blocks; i += 8) {
mi = _mm_loadl_epi64((xmmi *)(m + i));
v13 = _mm_xor_si128(v13, _mm_slli_si128(mi, 8));
sipcompress()
sipcompress()
v02 = _mm_xor_si128(v02, mi);
}
switch (len - blocks) {
case 7: last7 |= (uint64_t)m[i + 6] << 48;
case 6: last7 |= (uint64_t)m[i + 5] << 40;
case 5: last7 |= (uint64_t)m[i + 4] << 32;
case 4: last7 |= (uint64_t)m[i + 3] << 24;
case 3: last7 |= (uint64_t)m[i + 2] << 16;
case 2: last7 |= (uint64_t)m[i + 1] << 8;
case 1: last7 |= (uint64_t)m[i + 0] ;
case 0:
default:;
};
mi = _mm_unpacklo_epi32(_mm_cvtsi32_si128((uint32_t)last7),_mm_cvtsi32_si128((uint32_t)(last7 >> 32)));
v13 = _mm_xor_si128(v13, _mm_slli_si128(mi, 8));
sipcompress()
sipcompress()
v02 = _mm_xor_si128(v02, mi);
v02 = _mm_xor_si128(v02, siphash_final.v);
sipcompress()
sipcompress()
sipcompress()
sipcompress()
v02 = _mm_xor_si128(v02, v13);
v02 = _mm_xor_si128(v02, _mm_shuffle_epi32(v02, _MM_SHUFFLE(1,0,3,2)));
lo = _mm_cvtsi128_si32(v02);
hi = _mm_cvtsi128_si32(_mm_srli_si128(v02, 4));
return ((uint64_t)hi << 32) | lo;
}
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