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/* Copyright (C) 2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* This file is provided under a dual BSD/GPLv2 license.
*
* 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 <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include "utils.h"
#define SIPHASH_ALIGNMENT __alignof__(uint64_t)
typedef struct {
uint64_t key[2];
} siphash_key_t;
static inline bool siphash_key_is_zero(const siphash_key_t *key)
{
return !(key->key[0] | key->key[1]);
}
uint64_t siphash(const void *data, size_t len, const siphash_key_t *key);
static inline void siphash_to_le64(void *dest, const void *data, size_t len,
const siphash_key_t *key)
{
uint64_t hash = siphash(data, len, key);
*(uint64_t *)dest = cpu_to_le64(hash);
}
static inline void siphash_to_be64(void *dest, const void *data, size_t len,
const siphash_key_t *key)
{
uint64_t hash = siphash(data, len, key);
*(uint64_t *)dest = cpu_to_be64(hash);
}
#endif /* _LINUX_SIPHASH_H */
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