mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-19 09:48:16 +00:00
283fc52ade
Without hardware acceleration, a cryptographically strong algorithm is too expensive for pauth_computepac. Even with hardware accel, we are not currently expecting to link the linux-user binaries to any crypto libraries, and doing so would generally make the --static build fail. So choose XXH64 as a reasonably quick and decent hash. Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210111235740.462469-2-richard.henderson@linaro.org Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
221 lines
6.4 KiB
C
221 lines
6.4 KiB
C
/*
|
|
* xxHash - Fast Hash algorithm
|
|
* Copyright (C) 2012-2016, Yann Collet
|
|
*
|
|
* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* + Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* + Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following disclaimer
|
|
* in the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* You can contact the author at :
|
|
* - xxHash source repository : https://github.com/Cyan4973/xxHash
|
|
*/
|
|
|
|
#ifndef QEMU_XXHASH_H
|
|
#define QEMU_XXHASH_H
|
|
|
|
#include "qemu/bitops.h"
|
|
|
|
#define PRIME32_1 2654435761U
|
|
#define PRIME32_2 2246822519U
|
|
#define PRIME32_3 3266489917U
|
|
#define PRIME32_4 668265263U
|
|
#define PRIME32_5 374761393U
|
|
|
|
#define QEMU_XXHASH_SEED 1
|
|
|
|
/*
|
|
* xxhash32, customized for input variables that are not guaranteed to be
|
|
* contiguous in memory.
|
|
*/
|
|
static inline uint32_t
|
|
qemu_xxhash7(uint64_t ab, uint64_t cd, uint32_t e, uint32_t f, uint32_t g)
|
|
{
|
|
uint32_t v1 = QEMU_XXHASH_SEED + PRIME32_1 + PRIME32_2;
|
|
uint32_t v2 = QEMU_XXHASH_SEED + PRIME32_2;
|
|
uint32_t v3 = QEMU_XXHASH_SEED + 0;
|
|
uint32_t v4 = QEMU_XXHASH_SEED - PRIME32_1;
|
|
uint32_t a = ab;
|
|
uint32_t b = ab >> 32;
|
|
uint32_t c = cd;
|
|
uint32_t d = cd >> 32;
|
|
uint32_t h32;
|
|
|
|
v1 += a * PRIME32_2;
|
|
v1 = rol32(v1, 13);
|
|
v1 *= PRIME32_1;
|
|
|
|
v2 += b * PRIME32_2;
|
|
v2 = rol32(v2, 13);
|
|
v2 *= PRIME32_1;
|
|
|
|
v3 += c * PRIME32_2;
|
|
v3 = rol32(v3, 13);
|
|
v3 *= PRIME32_1;
|
|
|
|
v4 += d * PRIME32_2;
|
|
v4 = rol32(v4, 13);
|
|
v4 *= PRIME32_1;
|
|
|
|
h32 = rol32(v1, 1) + rol32(v2, 7) + rol32(v3, 12) + rol32(v4, 18);
|
|
h32 += 28;
|
|
|
|
h32 += e * PRIME32_3;
|
|
h32 = rol32(h32, 17) * PRIME32_4;
|
|
|
|
h32 += f * PRIME32_3;
|
|
h32 = rol32(h32, 17) * PRIME32_4;
|
|
|
|
h32 += g * PRIME32_3;
|
|
h32 = rol32(h32, 17) * PRIME32_4;
|
|
|
|
h32 ^= h32 >> 15;
|
|
h32 *= PRIME32_2;
|
|
h32 ^= h32 >> 13;
|
|
h32 *= PRIME32_3;
|
|
h32 ^= h32 >> 16;
|
|
|
|
return h32;
|
|
}
|
|
|
|
static inline uint32_t qemu_xxhash2(uint64_t ab)
|
|
{
|
|
return qemu_xxhash7(ab, 0, 0, 0, 0);
|
|
}
|
|
|
|
static inline uint32_t qemu_xxhash4(uint64_t ab, uint64_t cd)
|
|
{
|
|
return qemu_xxhash7(ab, cd, 0, 0, 0);
|
|
}
|
|
|
|
static inline uint32_t qemu_xxhash5(uint64_t ab, uint64_t cd, uint32_t e)
|
|
{
|
|
return qemu_xxhash7(ab, cd, e, 0, 0);
|
|
}
|
|
|
|
static inline uint32_t qemu_xxhash6(uint64_t ab, uint64_t cd, uint32_t e,
|
|
uint32_t f)
|
|
{
|
|
return qemu_xxhash7(ab, cd, e, f, 0);
|
|
}
|
|
|
|
/*
|
|
* Component parts of the XXH64 algorithm from
|
|
* https://github.com/Cyan4973/xxHash/blob/v0.8.0/xxhash.h
|
|
*
|
|
* The complete algorithm looks like
|
|
*
|
|
* i = 0;
|
|
* if (len >= 32) {
|
|
* v1 = seed + XXH_PRIME64_1 + XXH_PRIME64_2;
|
|
* v2 = seed + XXH_PRIME64_2;
|
|
* v3 = seed + 0;
|
|
* v4 = seed - XXH_PRIME64_1;
|
|
* do {
|
|
* v1 = XXH64_round(v1, get64bits(input + i));
|
|
* v2 = XXH64_round(v2, get64bits(input + i + 8));
|
|
* v3 = XXH64_round(v3, get64bits(input + i + 16));
|
|
* v4 = XXH64_round(v4, get64bits(input + i + 24));
|
|
* } while ((i += 32) <= len);
|
|
* h64 = XXH64_mergerounds(v1, v2, v3, v4);
|
|
* } else {
|
|
* h64 = seed + XXH_PRIME64_5;
|
|
* }
|
|
* h64 += len;
|
|
*
|
|
* for (; i + 8 <= len; i += 8) {
|
|
* h64 ^= XXH64_round(0, get64bits(input + i));
|
|
* h64 = rol64(h64, 27) * XXH_PRIME64_1 + XXH_PRIME64_4;
|
|
* }
|
|
* for (; i + 4 <= len; i += 4) {
|
|
* h64 ^= get32bits(input + i) * PRIME64_1;
|
|
* h64 = rol64(h64, 23) * XXH_PRIME64_2 + XXH_PRIME64_3;
|
|
* }
|
|
* for (; i < len; i += 1) {
|
|
* h64 ^= get8bits(input + i) * XXH_PRIME64_5;
|
|
* h64 = rol64(h64, 11) * XXH_PRIME64_1;
|
|
* }
|
|
*
|
|
* return XXH64_avalanche(h64)
|
|
*
|
|
* Exposing the pieces instead allows for simplified usage when
|
|
* the length is a known constant and the inputs are in registers.
|
|
*/
|
|
#define XXH_PRIME64_1 0x9E3779B185EBCA87ULL
|
|
#define XXH_PRIME64_2 0xC2B2AE3D27D4EB4FULL
|
|
#define XXH_PRIME64_3 0x165667B19E3779F9ULL
|
|
#define XXH_PRIME64_4 0x85EBCA77C2B2AE63ULL
|
|
#define XXH_PRIME64_5 0x27D4EB2F165667C5ULL
|
|
|
|
static inline uint64_t XXH64_round(uint64_t acc, uint64_t input)
|
|
{
|
|
return rol64(acc + input * XXH_PRIME64_2, 31) * XXH_PRIME64_1;
|
|
}
|
|
|
|
static inline uint64_t XXH64_mergeround(uint64_t acc, uint64_t val)
|
|
{
|
|
return (acc ^ XXH64_round(0, val)) * XXH_PRIME64_1 + XXH_PRIME64_4;
|
|
}
|
|
|
|
static inline uint64_t XXH64_mergerounds(uint64_t v1, uint64_t v2,
|
|
uint64_t v3, uint64_t v4)
|
|
{
|
|
uint64_t h64;
|
|
|
|
h64 = rol64(v1, 1) + rol64(v2, 7) + rol64(v3, 12) + rol64(v4, 18);
|
|
h64 = XXH64_mergeround(h64, v1);
|
|
h64 = XXH64_mergeround(h64, v2);
|
|
h64 = XXH64_mergeround(h64, v3);
|
|
h64 = XXH64_mergeround(h64, v4);
|
|
|
|
return h64;
|
|
}
|
|
|
|
static inline uint64_t XXH64_avalanche(uint64_t h64)
|
|
{
|
|
h64 ^= h64 >> 33;
|
|
h64 *= XXH_PRIME64_2;
|
|
h64 ^= h64 >> 29;
|
|
h64 *= XXH_PRIME64_3;
|
|
h64 ^= h64 >> 32;
|
|
return h64;
|
|
}
|
|
|
|
static inline uint64_t qemu_xxhash64_4(uint64_t a, uint64_t b,
|
|
uint64_t c, uint64_t d)
|
|
{
|
|
uint64_t v1 = QEMU_XXHASH_SEED + XXH_PRIME64_1 + XXH_PRIME64_2;
|
|
uint64_t v2 = QEMU_XXHASH_SEED + XXH_PRIME64_2;
|
|
uint64_t v3 = QEMU_XXHASH_SEED + 0;
|
|
uint64_t v4 = QEMU_XXHASH_SEED - XXH_PRIME64_1;
|
|
|
|
v1 = XXH64_round(v1, a);
|
|
v2 = XXH64_round(v2, b);
|
|
v3 = XXH64_round(v3, c);
|
|
v4 = XXH64_round(v4, d);
|
|
|
|
return XXH64_avalanche(XXH64_mergerounds(v1, v2, v3, v4));
|
|
}
|
|
|
|
#endif /* QEMU_XXHASH_H */
|