61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* This file is provided under a dual BSD/GPLv2 license.
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*
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* SipHash: a fast short-input PRF
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* https://131002.net/siphash/
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*
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* This implementation is specifically for SipHash2-4 for a secure PRF
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* and HalfSipHash1-3/SipHash1-3 for an insecure PRF only suitable for
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* hashtables.
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*/
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#ifndef TUNSAFE_CRYPTO_SIPHASH_H_
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#define TUNSAFE_CRYPTO_SIPHASH_H_
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#include "tunsafe_types.h"
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typedef struct {
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uint64 key[2];
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} siphash_key_t;
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uint64 siphash_1u64(const uint64 a, const siphash_key_t *key);
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uint64 siphash_2u64(const uint64 a, const uint64 b, const siphash_key_t *key);
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uint64 siphash_3u64(const uint64 a, const uint64 b, const uint64 c,
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const siphash_key_t *key);
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uint64 siphash_4u64(const uint64 a, const uint64 b, const uint64 c, const uint64 d,
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const siphash_key_t *key);
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uint64 siphash_1u32(const uint32 a, const siphash_key_t *key);
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uint64 siphash_3u32(const uint32 a, const uint32 b, const uint32 c,
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const siphash_key_t *key);
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static inline uint64 siphash_2u32(const uint32 a, const uint32 b,
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const siphash_key_t *key)
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{
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return siphash_1u64((uint64)b << 32 | a, key);
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}
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static inline uint64 siphash_4u32(const uint32 a, const uint32 b, const uint32 c,
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const uint32 d, const siphash_key_t *key)
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{
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return siphash_2u64((uint64)b << 32 | a, (uint64)d << 32 | c, key);
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}
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uint64 siphash_u64_u32(const uint64 combined, const uint32 third, const siphash_key_t *key);
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/**
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* siphash - compute 64-bit siphash PRF value
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* @data: buffer to hash
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* @size: size of @data
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* @key: the siphash key
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*/
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uint64 siphash(const void *data, size_t len, const siphash_key_t *key);
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uint64 siphash13_2u64(const uint64 first, const uint64 second, const siphash_key_t *key);
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uint64 siphash13_3u64(const uint64 first, const uint64 second, const uint64 third,
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const siphash_key_t *key);
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uint64 siphash13_4u64(const uint64 first, const uint64 second, const uint64 third,
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const uint64 fourth, const siphash_key_t *key);
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#endif // TUNSAFE_CRYPTO_SIPHASH_H_
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