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145 lines
4.6 KiB
145 lines
4.6 KiB
/* Copyright (C) 2016 Jason A. Donenfeld <[email protected]>. 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 _LINUX_SIPHASH_H |
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#define _LINUX_SIPHASH_H |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#define SIPHASH_ALIGNMENT __alignof__(u64) |
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typedef struct { |
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u64 key[2]; |
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} siphash_key_t; |
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static inline bool siphash_key_is_zero(const siphash_key_t *key) |
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{ |
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return !(key->key[0] | key->key[1]); |
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} |
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u64 __siphash_aligned(const void *data, size_t len, const siphash_key_t *key); |
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#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
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u64 __siphash_unaligned(const void *data, size_t len, const siphash_key_t *key); |
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#endif |
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u64 siphash_1u64(const u64 a, const siphash_key_t *key); |
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u64 siphash_2u64(const u64 a, const u64 b, const siphash_key_t *key); |
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u64 siphash_3u64(const u64 a, const u64 b, const u64 c, |
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const siphash_key_t *key); |
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u64 siphash_4u64(const u64 a, const u64 b, const u64 c, const u64 d, |
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const siphash_key_t *key); |
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u64 siphash_1u32(const u32 a, const siphash_key_t *key); |
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u64 siphash_3u32(const u32 a, const u32 b, const u32 c, |
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const siphash_key_t *key); |
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static inline u64 siphash_2u32(const u32 a, const u32 b, |
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const siphash_key_t *key) |
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{ |
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return siphash_1u64((u64)b << 32 | a, key); |
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} |
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static inline u64 siphash_4u32(const u32 a, const u32 b, const u32 c, |
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const u32 d, const siphash_key_t *key) |
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{ |
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return siphash_2u64((u64)b << 32 | a, (u64)d << 32 | c, key); |
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} |
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static inline u64 ___siphash_aligned(const __le64 *data, size_t len, |
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const siphash_key_t *key) |
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{ |
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if (__builtin_constant_p(len) && len == 4) |
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return siphash_1u32(le32_to_cpup((const __le32 *)data), key); |
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if (__builtin_constant_p(len) && len == 8) |
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return siphash_1u64(le64_to_cpu(data[0]), key); |
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if (__builtin_constant_p(len) && len == 16) |
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return siphash_2u64(le64_to_cpu(data[0]), le64_to_cpu(data[1]), |
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key); |
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if (__builtin_constant_p(len) && len == 24) |
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return siphash_3u64(le64_to_cpu(data[0]), le64_to_cpu(data[1]), |
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le64_to_cpu(data[2]), key); |
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if (__builtin_constant_p(len) && len == 32) |
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return siphash_4u64(le64_to_cpu(data[0]), le64_to_cpu(data[1]), |
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le64_to_cpu(data[2]), le64_to_cpu(data[3]), |
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key); |
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return __siphash_aligned(data, len, key); |
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} |
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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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static inline u64 siphash(const void *data, size_t len, |
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const siphash_key_t *key) |
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{ |
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#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
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if (!IS_ALIGNED((unsigned long)data, SIPHASH_ALIGNMENT)) |
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return __siphash_unaligned(data, len, key); |
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#endif |
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return ___siphash_aligned(data, len, key); |
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} |
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#define HSIPHASH_ALIGNMENT __alignof__(unsigned long) |
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typedef struct { |
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unsigned long key[2]; |
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} hsiphash_key_t; |
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u32 __hsiphash_aligned(const void *data, size_t len, |
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const hsiphash_key_t *key); |
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#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
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u32 __hsiphash_unaligned(const void *data, size_t len, |
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const hsiphash_key_t *key); |
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#endif |
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u32 hsiphash_1u32(const u32 a, const hsiphash_key_t *key); |
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u32 hsiphash_2u32(const u32 a, const u32 b, const hsiphash_key_t *key); |
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u32 hsiphash_3u32(const u32 a, const u32 b, const u32 c, |
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const hsiphash_key_t *key); |
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u32 hsiphash_4u32(const u32 a, const u32 b, const u32 c, const u32 d, |
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const hsiphash_key_t *key); |
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static inline u32 ___hsiphash_aligned(const __le32 *data, size_t len, |
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const hsiphash_key_t *key) |
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{ |
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if (__builtin_constant_p(len) && len == 4) |
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return hsiphash_1u32(le32_to_cpu(data[0]), key); |
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if (__builtin_constant_p(len) && len == 8) |
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return hsiphash_2u32(le32_to_cpu(data[0]), le32_to_cpu(data[1]), |
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key); |
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if (__builtin_constant_p(len) && len == 12) |
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return hsiphash_3u32(le32_to_cpu(data[0]), le32_to_cpu(data[1]), |
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le32_to_cpu(data[2]), key); |
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if (__builtin_constant_p(len) && len == 16) |
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return hsiphash_4u32(le32_to_cpu(data[0]), le32_to_cpu(data[1]), |
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le32_to_cpu(data[2]), le32_to_cpu(data[3]), |
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key); |
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return __hsiphash_aligned(data, len, key); |
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} |
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/** |
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* hsiphash - compute 32-bit hsiphash PRF value |
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* @data: buffer to hash |
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* @size: size of @data |
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* @key: the hsiphash key |
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*/ |
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static inline u32 hsiphash(const void *data, size_t len, |
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const hsiphash_key_t *key) |
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{ |
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#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
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if (!IS_ALIGNED((unsigned long)data, HSIPHASH_ALIGNMENT)) |
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return __hsiphash_unaligned(data, len, key); |
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#endif |
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return ___hsiphash_aligned(data, len, key); |
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} |
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#endif /* _LINUX_SIPHASH_H */
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