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/*
* Copyright (c) 2016-2020 Positive Technologies, https://www.ptsecurity.com,
* Fast Positive Hash.
*
* Portions Copyright (c) 2010-2020 Leonid Yuriev <leo@yuriev.ru>,
* The 1Hippeus project (t1h).
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgement in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/*
* t1ha = { Fast Positive Hash, aka "Позитивный Хэш" }
* by [Positive Technologies](https://www.ptsecurity.ru)
*
* Briefly, it is a 64-bit Hash Function:
* 1. Created for 64-bit little-endian platforms, in predominantly for x86_64,
* but portable and without penalties it can run on any 64-bit CPU.
* 2. In most cases up to 15% faster than City64, xxHash, mum-hash, metro-hash
* and all others portable hash-functions (which do not use specific
* hardware tricks).
* 3. Not suitable for cryptography.
*
* The Future will (be) Positive. Всё будет хорошо.
*
* ACKNOWLEDGEMENT:
* The t1ha was originally developed by Leonid Yuriev (Леонид Юрьев)
* for The 1Hippeus project - zerocopy messaging in the spirit of Sparta!
*/
#include "t1ha_bits.h"
#include "t1ha_selfcheck.h"
#if T1HA0_AESNI_AVAILABLE
uint64_t T1HA_IA32AES_NAME(const void *data, size_t len, uint64_t seed) {
uint64_t a = seed;
uint64_t b = len;
if (unlikely(len > 32)) {
__m128i x = _mm_set_epi64x(a, b);
__m128i y = _mm_aesenc_si128(x, _mm_set_epi64x(prime_0, prime_1));
const __m128i *v = (const __m128i *)data;
const __m128i *const detent =
(const __m128i *)((const uint8_t *)data + (len & ~15ul));
data = detent;
if (len & 16) {
x = _mm_add_epi64(x, _mm_loadu_si128(v++));
y = _mm_aesenc_si128(x, y);
}
len &= 15;
if (v + 7 < detent) {
__m128i salt = y;
do {
__m128i t = _mm_aesenc_si128(_mm_loadu_si128(v++), salt);
t = _mm_aesdec_si128(t, _mm_loadu_si128(v++));
t = _mm_aesdec_si128(t, _mm_loadu_si128(v++));
t = _mm_aesdec_si128(t, _mm_loadu_si128(v++));
t = _mm_aesdec_si128(t, _mm_loadu_si128(v++));
t = _mm_aesdec_si128(t, _mm_loadu_si128(v++));
t = _mm_aesdec_si128(t, _mm_loadu_si128(v++));
t = _mm_aesdec_si128(t, _mm_loadu_si128(v++));
salt = _mm_add_epi64(salt, _mm_set_epi64x(prime_5, prime_6));
t = _mm_aesenc_si128(x, t);
x = _mm_add_epi64(y, x);
y = t;
} while (v + 7 < detent);
}
while (v < detent) {
__m128i v0y = _mm_add_epi64(y, _mm_loadu_si128(v++));
__m128i v1x = _mm_sub_epi64(x, _mm_loadu_si128(v++));
x = _mm_aesdec_si128(x, v0y);
y = _mm_aesdec_si128(y, v1x);
}
x = _mm_add_epi64(_mm_aesdec_si128(x, _mm_aesenc_si128(y, x)), y);
#if defined(__x86_64__) || defined(_M_X64)
#if defined(__SSE4_1__) || defined(__AVX__)
a = _mm_extract_epi64(x, 0);
b = _mm_extract_epi64(x, 1);
#else
a = _mm_cvtsi128_si64(x);
b = _mm_cvtsi128_si64(_mm_unpackhi_epi64(x, x));
#endif
#else
#if defined(__SSE4_1__) || defined(__AVX__)
a = (uint32_t)_mm_extract_epi32(x, 0) | (uint64_t)_mm_extract_epi32(x, 1)
<< 32;
b = (uint32_t)_mm_extract_epi32(x, 2) | (uint64_t)_mm_extract_epi32(x, 3)
<< 32;
#else
a = (uint32_t)_mm_cvtsi128_si32(x);
a |= (uint64_t)_mm_cvtsi128_si32(_mm_shuffle_epi32(x, 1)) << 32;
x = _mm_unpackhi_epi64(x, x);
b = (uint32_t)_mm_cvtsi128_si32(x);
b |= (uint64_t)_mm_cvtsi128_si32(_mm_shuffle_epi32(x, 1)) << 32;
#endif
#endif
#ifdef __AVX__
_mm256_zeroupper();
#elif !(defined(_X86_64_) || defined(__x86_64__) || defined(_M_X64) || \
defined(__e2k__))
_mm_empty();
#endif
}
const uint64_t *v = (const uint64_t *)data;
switch (len) {
default:
mixup64(&a, &b, fetch64_le_unaligned(v++), prime_4);
/* fall through */
case 24:
case 23:
case 22:
case 21:
case 20:
case 19:
case 18:
case 17:
mixup64(&b, &a, fetch64_le_unaligned(v++), prime_3);
/* fall through */
case 16:
case 15:
case 14:
case 13:
case 12:
case 11:
case 10:
case 9:
mixup64(&a, &b, fetch64_le_unaligned(v++), prime_2);
/* fall through */
case 8:
case 7:
case 6:
case 5:
case 4:
case 3:
case 2:
case 1:
mixup64(&b, &a, tail64_le_unaligned(v, len), prime_1);
/* fall through */
case 0:
return final64(a, b);
}
}
#endif /* T1HA0_AESNI_AVAILABLE */
#undef T1HA_IA32AES_NAME
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