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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 <linux/types.h> #include <linux/kernel.h> #define SIPHASH_ALIGNMENT __alignof__(u64) typedef struct { u64 key[2]; } siphash_key_t; 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 */

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