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/*
* Copyright (c) 2016-2018 Positive Technologies, https://www.ptsecurity.com,
* Fast Positive Hash.
*
* Portions Copyright (c) 2010-2018 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 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_selfcheck.h"
#include "t1ha_bits.h"
const uint8_t t1ha_test_pattern[64] = {
0, 1, 2, 3, 4, 5, 6, 7, 0xFF, 0x7F, 0x3F,
0x1F, 0xF, 8, 16, 32, 64, 0x80, 0xFE, 0xFC, 0xF8, 0xF0,
0xE0, 0xC0, 0xFD, 0xFB, 0xF7, 0xEF, 0xDF, 0xBF, 0x55, 0xAA, 11,
17, 19, 23, 29, 37, 42, 43, 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x'};
static VC_INLINE int probe(uint64_t (*hash)(const void *, size_t, uint64_t),
const uint64_t reference, const void *data,
unsigned len, uint64_t seed) {
const uint64_t actual = hash(data, len, seed);
assert(actual == reference);
return actual != reference;
}
__cold int t1ha_selfcheck(uint64_t (*hash)(const void *, size_t, uint64_t),
const uint64_t *reference_values) {
int failed = 0;
uint64_t seed = 1;
const uint64_t zero = 0;
uint8_t pattern_long[512];
int i;
failed |= probe(hash, /* empty-zero */ *reference_values++, NULL, 0, zero);
failed |= probe(hash, /* empty-all1 */ *reference_values++, NULL, 0, ~zero);
failed |= probe(hash, /* bin64-zero */ *reference_values++, t1ha_test_pattern,
64, zero);
for (i = 1; i < 64; i++) {
/* bin%i-1p%i */
failed |= probe(hash, *reference_values++, t1ha_test_pattern, i, seed);
seed <<= 1;
}
seed = ~zero;
for (i = 1; i <= 7; i++) {
seed <<= 1;
/* align%i_F%i */;
failed |=
probe(hash, *reference_values++, t1ha_test_pattern + i, 64 - i, seed);
}
for (i = 0; i < sizeof(pattern_long); ++i)
pattern_long[i] = (uint8_t)i;
for (i = 0; i <= 7; i++) {
/* long-%05i */
failed |=
probe(hash, *reference_values++, pattern_long + i, 128 + i * 17, seed);
}
return failed ? -1 : 0;
}
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