linux/include/linux/siphash.h

/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
/* Copyright (C) 2016-2022 Jason A. Donenfeld <[email protected]>. 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 …
siphash_key_t;

#define siphash_aligned_key_t …

static inline bool siphash_key_is_zero(const siphash_key_t *key)
{ … }

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)
{ … }
static inline u64 siphash_4u32(const u32 a, const u32 b, const u32 c,
			       const u32 d, const siphash_key_t *key)
{ … }


static inline u64 ___siphash_aligned(const __le64 *data, size_t len,
				     const siphash_key_t *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)
{ … }

#define HSIPHASH_ALIGNMENT …
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)
{ … }

/**
 * 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)
{ … }

/*
 * 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) …

#define SIPHASH_CONST_0 …
#define SIPHASH_CONST_1 …
#define SIPHASH_CONST_2 …
#define SIPHASH_CONST_3 …

#define HSIPHASH_PERMUTATION(a, b, c, d) …

#define HSIPHASH_CONST_0 …
#define HSIPHASH_CONST_1 …
#define HSIPHASH_CONST_2 …
#define HSIPHASH_CONST_3 …

#endif /* _LINUX_SIPHASH_H */