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t1ha2.c
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t1ha2.c
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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!
*/
#ifndef T1HA2_DISABLED
#include "t1ha_bits.h"
#include "t1ha_selfcheck.h"
static __always_inline void init_ab(t1ha_state256_t *s, uint64_t x,
uint64_t y) {
s->n.a = x;
s->n.b = y;
}
static __always_inline void init_cd(t1ha_state256_t *s, uint64_t x,
uint64_t y) {
s->n.c = rot64(y, 23) + ~x;
s->n.d = ~y + rot64(x, 19);
}
/* TODO: C++ template in the next version */
#define T1HA2_UPDATE(ENDIANNES, ALIGNESS, state, v) \
do { \
t1ha_state256_t *const s = state; \
const uint64_t w0 = fetch64_##ENDIANNES##_##ALIGNESS(v + 0); \
const uint64_t w1 = fetch64_##ENDIANNES##_##ALIGNESS(v + 1); \
const uint64_t w2 = fetch64_##ENDIANNES##_##ALIGNESS(v + 2); \
const uint64_t w3 = fetch64_##ENDIANNES##_##ALIGNESS(v + 3); \
\
const uint64_t d02 = w0 + rot64(w2 + s->n.d, 56); \
const uint64_t c13 = w1 + rot64(w3 + s->n.c, 19); \
s->n.d ^= s->n.b + rot64(w1, 38); \
s->n.c ^= s->n.a + rot64(w0, 57); \
s->n.b ^= prime_6 * (c13 + w2); \
s->n.a ^= prime_5 * (d02 + w3); \
} while (0)
static __always_inline void squash(t1ha_state256_t *s) {
s->n.a ^= prime_6 * (s->n.c + rot64(s->n.d, 23));
s->n.b ^= prime_5 * (rot64(s->n.c, 19) + s->n.d);
}
/* TODO: C++ template in the next version */
#define T1HA2_LOOP(ENDIANNES, ALIGNESS, state, data, len) \
do { \
const void *detent = (const uint8_t *)data + len - 31; \
do { \
const uint64_t *v = (const uint64_t *)data; \
data = (const uint64_t *)data + 4; \
prefetch(data); \
T1HA2_UPDATE(le, ALIGNESS, state, v); \
} while (likely(data < detent)); \
} while (0)
/* TODO: C++ template in the next version */
#define T1HA2_TAIL_AB(ENDIANNES, ALIGNESS, state, data, len) \
do { \
t1ha_state256_t *const s = state; \
const uint64_t *v = (const uint64_t *)data; \
switch (len) { \
default: \
mixup64(&s->n.a, &s->n.b, fetch64_##ENDIANNES##_##ALIGNESS(v++), \
prime_4); \
/* fall through */ \
case 24: \
case 23: \
case 22: \
case 21: \
case 20: \
case 19: \
case 18: \
case 17: \
mixup64(&s->n.b, &s->n.a, fetch64_##ENDIANNES##_##ALIGNESS(v++), \
prime_3); \
/* fall through */ \
case 16: \
case 15: \
case 14: \
case 13: \
case 12: \
case 11: \
case 10: \
case 9: \
mixup64(&s->n.a, &s->n.b, fetch64_##ENDIANNES##_##ALIGNESS(v++), \
prime_2); \
/* fall through */ \
case 8: \
case 7: \
case 6: \
case 5: \
case 4: \
case 3: \
case 2: \
case 1: \
mixup64(&s->n.b, &s->n.a, tail64_##ENDIANNES##_##ALIGNESS(v, len), \
prime_1); \
/* fall through */ \
case 0: \
return final64(s->n.a, s->n.b); \
} \
} while (0)
/* TODO: C++ template in the next version */
#define T1HA2_TAIL_ABCD(ENDIANNES, ALIGNESS, state, data, len) \
do { \
t1ha_state256_t *const s = state; \
const uint64_t *v = (const uint64_t *)data; \
switch (len) { \
default: \
mixup64(&s->n.a, &s->n.d, fetch64_##ENDIANNES##_##ALIGNESS(v++), \
prime_4); \
/* fall through */ \
case 24: \
case 23: \
case 22: \
case 21: \
case 20: \
case 19: \
case 18: \
case 17: \
mixup64(&s->n.b, &s->n.a, fetch64_##ENDIANNES##_##ALIGNESS(v++), \
prime_3); \
/* fall through */ \
case 16: \
case 15: \
case 14: \
case 13: \
case 12: \
case 11: \
case 10: \
case 9: \
mixup64(&s->n.c, &s->n.b, fetch64_##ENDIANNES##_##ALIGNESS(v++), \
prime_2); \
/* fall through */ \
case 8: \
case 7: \
case 6: \
case 5: \
case 4: \
case 3: \
case 2: \
case 1: \
mixup64(&s->n.d, &s->n.c, tail64_##ENDIANNES##_##ALIGNESS(v, len), \
prime_1); \
/* fall through */ \
case 0: \
return final128(s->n.a, s->n.b, s->n.c, s->n.d, extra_result); \
} \
} while (0)
static __always_inline uint64_t final128(uint64_t a, uint64_t b, uint64_t c,
uint64_t d, uint64_t *h) {
mixup64(&a, &b, rot64(c, 41) ^ d, prime_0);
mixup64(&b, &c, rot64(d, 23) ^ a, prime_6);
mixup64(&c, &d, rot64(a, 19) ^ b, prime_5);
mixup64(&d, &a, rot64(b, 31) ^ c, prime_4);
*h = c + d;
return a ^ b;
}
//------------------------------------------------------------------------------
uint64_t t1ha2_atonce(const void *data, size_t length, uint64_t seed) {
t1ha_state256_t state;
init_ab(&state, seed, length);
#if T1HA_SYS_UNALIGNED_ACCESS == T1HA_UNALIGNED_ACCESS__EFFICIENT
if (unlikely(length > 32)) {
init_cd(&state, seed, length);
T1HA2_LOOP(le, unaligned, &state, data, length);
squash(&state);
length &= 31;
}
T1HA2_TAIL_AB(le, unaligned, &state, data, length);
#else
const bool misaligned = (((uintptr_t)data) & (ALIGNMENT_64 - 1)) != 0;
if (misaligned) {
if (unlikely(length > 32)) {
init_cd(&state, seed, length);
T1HA2_LOOP(le, unaligned, &state, data, length);
squash(&state);
length &= 31;
}
T1HA2_TAIL_AB(le, unaligned, &state, data, length);
} else {
if (unlikely(length > 32)) {
init_cd(&state, seed, length);
T1HA2_LOOP(le, aligned, &state, data, length);
squash(&state);
length &= 31;
}
T1HA2_TAIL_AB(le, aligned, &state, data, length);
}
#endif
}
uint64_t t1ha2_atonce128(uint64_t *__restrict extra_result,
const void *__restrict data, size_t length,
uint64_t seed) {
t1ha_state256_t state;
init_ab(&state, seed, length);
init_cd(&state, seed, length);
#if T1HA_SYS_UNALIGNED_ACCESS == T1HA_UNALIGNED_ACCESS__EFFICIENT
if (unlikely(length > 32)) {
T1HA2_LOOP(le, unaligned, &state, data, length);
length &= 31;
}
T1HA2_TAIL_ABCD(le, unaligned, &state, data, length);
#else
const bool misaligned = (((uintptr_t)data) & (ALIGNMENT_64 - 1)) != 0;
if (misaligned) {
if (unlikely(length > 32)) {
T1HA2_LOOP(le, unaligned, &state, data, length);
length &= 31;
}
T1HA2_TAIL_ABCD(le, unaligned, &state, data, length);
} else {
if (unlikely(length > 32)) {
T1HA2_LOOP(le, aligned, &state, data, length);
length &= 31;
}
T1HA2_TAIL_ABCD(le, aligned, &state, data, length);
}
#endif
}
//------------------------------------------------------------------------------
void t1ha2_init(t1ha_context_t *ctx, uint64_t seed_x, uint64_t seed_y) {
init_ab(&ctx->state, seed_x, seed_y);
init_cd(&ctx->state, seed_x, seed_y);
ctx->partial = 0;
ctx->total = 0;
}
void t1ha2_update(t1ha_context_t *__restrict ctx, const void *__restrict data,
size_t length) {
ctx->total += length;
if (ctx->partial) {
const size_t left = 32 - ctx->partial;
const size_t chunk = (length >= left) ? left : length;
memcpy(ctx->buffer.bytes + ctx->partial, data, chunk);
ctx->partial += chunk;
if (ctx->partial < 32) {
assert(left >= length);
return;
}
ctx->partial = 0;
data = (const uint8_t *)data + chunk;
length -= chunk;
T1HA2_UPDATE(le, aligned, &ctx->state, ctx->buffer.u64);
}
if (length >= 32) {
#if T1HA_SYS_UNALIGNED_ACCESS == T1HA_UNALIGNED_ACCESS__EFFICIENT
T1HA2_LOOP(le, unaligned, &ctx->state, data, length);
#else
const bool misaligned = (((uintptr_t)data) & (ALIGNMENT_64 - 1)) != 0;
if (misaligned) {
T1HA2_LOOP(le, unaligned, &ctx->state, data, length);
} else {
T1HA2_LOOP(le, aligned, &ctx->state, data, length);
}
#endif
length &= 31;
}
if (length)
memcpy(ctx->buffer.bytes, data, ctx->partial = length);
}
uint64_t t1ha2_final(t1ha_context_t *__restrict ctx,
uint64_t *__restrict extra_result) {
uint64_t bits = (ctx->total << 3) ^ (UINT64_C(1) << 63);
#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
bits = bswap64(bits);
#endif
t1ha2_update(ctx, &bits, 8);
if (likely(!extra_result)) {
squash(&ctx->state);
T1HA2_TAIL_AB(le, aligned, &ctx->state, ctx->buffer.u64, ctx->partial);
}
T1HA2_TAIL_ABCD(le, aligned, &ctx->state, ctx->buffer.u64, ctx->partial);
}
#endif /* T1HA2_DISABLED */