169 строки
5.7 KiB
C
169 строки
5.7 KiB
C
/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
|
|
/* Copyright (C) 2016-2022 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
|
|
*
|
|
* SipHash: a fast short-input PRF
|
|
* https://131002.net/siphash/
|
|
*
|
|
* This implementation is specifically for SipHash2-4 for a secure PRF
|
|
* and HalfSipHash1-3/SipHash1-3 for an insecure PRF only suitable for
|
|
* hashtables.
|
|
*/
|
|
|
|
#ifndef _LINUX_SIPHASH_H
|
|
#define _LINUX_SIPHASH_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#define SIPHASH_ALIGNMENT __alignof__(u64)
|
|
typedef struct {
|
|
u64 key[2];
|
|
} siphash_key_t;
|
|
|
|
#define siphash_aligned_key_t siphash_key_t __aligned(16)
|
|
|
|
static inline bool siphash_key_is_zero(const siphash_key_t *key)
|
|
{
|
|
return !(key->key[0] | key->key[1]);
|
|
}
|
|
|
|
u64 __siphash_aligned(const void *data, size_t len, const siphash_key_t *key);
|
|
u64 __siphash_unaligned(const void *data, size_t len, const siphash_key_t *key);
|
|
|
|
u64 siphash_1u64(const u64 a, const siphash_key_t *key);
|
|
u64 siphash_2u64(const u64 a, const u64 b, const siphash_key_t *key);
|
|
u64 siphash_3u64(const u64 a, const u64 b, const u64 c,
|
|
const siphash_key_t *key);
|
|
u64 siphash_4u64(const u64 a, const u64 b, const u64 c, const u64 d,
|
|
const siphash_key_t *key);
|
|
u64 siphash_1u32(const u32 a, const siphash_key_t *key);
|
|
u64 siphash_3u32(const u32 a, const u32 b, const u32 c,
|
|
const siphash_key_t *key);
|
|
|
|
static inline u64 siphash_2u32(const u32 a, const u32 b,
|
|
const siphash_key_t *key)
|
|
{
|
|
return siphash_1u64((u64)b << 32 | a, key);
|
|
}
|
|
static inline u64 siphash_4u32(const u32 a, const u32 b, const u32 c,
|
|
const u32 d, const siphash_key_t *key)
|
|
{
|
|
return siphash_2u64((u64)b << 32 | a, (u64)d << 32 | c, key);
|
|
}
|
|
|
|
|
|
static inline u64 ___siphash_aligned(const __le64 *data, size_t len,
|
|
const siphash_key_t *key)
|
|
{
|
|
if (__builtin_constant_p(len) && len == 4)
|
|
return siphash_1u32(le32_to_cpup((const __le32 *)data), key);
|
|
if (__builtin_constant_p(len) && len == 8)
|
|
return siphash_1u64(le64_to_cpu(data[0]), key);
|
|
if (__builtin_constant_p(len) && len == 16)
|
|
return siphash_2u64(le64_to_cpu(data[0]), le64_to_cpu(data[1]),
|
|
key);
|
|
if (__builtin_constant_p(len) && len == 24)
|
|
return siphash_3u64(le64_to_cpu(data[0]), le64_to_cpu(data[1]),
|
|
le64_to_cpu(data[2]), key);
|
|
if (__builtin_constant_p(len) && len == 32)
|
|
return siphash_4u64(le64_to_cpu(data[0]), le64_to_cpu(data[1]),
|
|
le64_to_cpu(data[2]), le64_to_cpu(data[3]),
|
|
key);
|
|
return __siphash_aligned(data, len, key);
|
|
}
|
|
|
|
/**
|
|
* siphash - compute 64-bit siphash PRF value
|
|
* @data: buffer to hash
|
|
* @size: size of @data
|
|
* @key: the siphash key
|
|
*/
|
|
static inline u64 siphash(const void *data, size_t len,
|
|
const siphash_key_t *key)
|
|
{
|
|
if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
|
|
!IS_ALIGNED((unsigned long)data, SIPHASH_ALIGNMENT))
|
|
return __siphash_unaligned(data, len, key);
|
|
return ___siphash_aligned(data, len, key);
|
|
}
|
|
|
|
#define HSIPHASH_ALIGNMENT __alignof__(unsigned long)
|
|
typedef struct {
|
|
unsigned long key[2];
|
|
} hsiphash_key_t;
|
|
|
|
u32 __hsiphash_aligned(const void *data, size_t len,
|
|
const hsiphash_key_t *key);
|
|
u32 __hsiphash_unaligned(const void *data, size_t len,
|
|
const hsiphash_key_t *key);
|
|
|
|
u32 hsiphash_1u32(const u32 a, const hsiphash_key_t *key);
|
|
u32 hsiphash_2u32(const u32 a, const u32 b, const hsiphash_key_t *key);
|
|
u32 hsiphash_3u32(const u32 a, const u32 b, const u32 c,
|
|
const hsiphash_key_t *key);
|
|
u32 hsiphash_4u32(const u32 a, const u32 b, const u32 c, const u32 d,
|
|
const hsiphash_key_t *key);
|
|
|
|
static inline u32 ___hsiphash_aligned(const __le32 *data, size_t len,
|
|
const hsiphash_key_t *key)
|
|
{
|
|
if (__builtin_constant_p(len) && len == 4)
|
|
return hsiphash_1u32(le32_to_cpu(data[0]), key);
|
|
if (__builtin_constant_p(len) && len == 8)
|
|
return hsiphash_2u32(le32_to_cpu(data[0]), le32_to_cpu(data[1]),
|
|
key);
|
|
if (__builtin_constant_p(len) && len == 12)
|
|
return hsiphash_3u32(le32_to_cpu(data[0]), le32_to_cpu(data[1]),
|
|
le32_to_cpu(data[2]), key);
|
|
if (__builtin_constant_p(len) && len == 16)
|
|
return hsiphash_4u32(le32_to_cpu(data[0]), le32_to_cpu(data[1]),
|
|
le32_to_cpu(data[2]), le32_to_cpu(data[3]),
|
|
key);
|
|
return __hsiphash_aligned(data, len, key);
|
|
}
|
|
|
|
/**
|
|
* hsiphash - compute 32-bit hsiphash PRF value
|
|
* @data: buffer to hash
|
|
* @size: size of @data
|
|
* @key: the hsiphash key
|
|
*/
|
|
static inline u32 hsiphash(const void *data, size_t len,
|
|
const hsiphash_key_t *key)
|
|
{
|
|
if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
|
|
!IS_ALIGNED((unsigned long)data, HSIPHASH_ALIGNMENT))
|
|
return __hsiphash_unaligned(data, len, key);
|
|
return ___hsiphash_aligned(data, len, key);
|
|
}
|
|
|
|
/*
|
|
* These macros expose the raw SipHash and HalfSipHash permutations.
|
|
* Do not use them directly! If you think you have a use for them,
|
|
* be sure to CC the maintainer of this file explaining why.
|
|
*/
|
|
|
|
#define SIPHASH_PERMUTATION(a, b, c, d) ( \
|
|
(a) += (b), (b) = rol64((b), 13), (b) ^= (a), (a) = rol64((a), 32), \
|
|
(c) += (d), (d) = rol64((d), 16), (d) ^= (c), \
|
|
(a) += (d), (d) = rol64((d), 21), (d) ^= (a), \
|
|
(c) += (b), (b) = rol64((b), 17), (b) ^= (c), (c) = rol64((c), 32))
|
|
|
|
#define SIPHASH_CONST_0 0x736f6d6570736575ULL
|
|
#define SIPHASH_CONST_1 0x646f72616e646f6dULL
|
|
#define SIPHASH_CONST_2 0x6c7967656e657261ULL
|
|
#define SIPHASH_CONST_3 0x7465646279746573ULL
|
|
|
|
#define HSIPHASH_PERMUTATION(a, b, c, d) ( \
|
|
(a) += (b), (b) = rol32((b), 5), (b) ^= (a), (a) = rol32((a), 16), \
|
|
(c) += (d), (d) = rol32((d), 8), (d) ^= (c), \
|
|
(a) += (d), (d) = rol32((d), 7), (d) ^= (a), \
|
|
(c) += (b), (b) = rol32((b), 13), (b) ^= (c), (c) = rol32((c), 16))
|
|
|
|
#define HSIPHASH_CONST_0 0U
|
|
#define HSIPHASH_CONST_1 0U
|
|
#define HSIPHASH_CONST_2 0x6c796765U
|
|
#define HSIPHASH_CONST_3 0x74656462U
|
|
|
|
#endif /* _LINUX_SIPHASH_H */
|