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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _SELINUX_HASH_H_
#define _SELINUX_HASH_H_
/*
* Based on MurmurHash3, written by Austin Appleby and placed in the
* public domain.
*/
static inline u32 av_hash(u32 key1, u32 key2, u32 key3, u32 mask)
{
static const u32 c1 = 0xcc9e2d51;
static const u32 c2 = 0x1b873593;
static const u32 r1 = 15;
static const u32 r2 = 13;
static const u32 m = 5;
static const u32 n = 0xe6546b64;
u32 hash = 0;
#define mix(input) \
do { \
u32 v = input; \
v *= c1; \
v = (v << r1) | (v >> (32 - r1)); \
v *= c2; \
hash ^= v; \
hash = (hash << r2) | (hash >> (32 - r2)); \
hash = hash * m + n; \
} while (0)
mix(key1);
mix(key2);
mix(key3);
#undef mix
hash ^= hash >> 16;
hash *= 0x85ebca6b;
hash ^= hash >> 13;
hash *= 0xc2b2ae35;
hash ^= hash >> 16;
return hash & mask;
}
#endif /* _SELINUX_HASH_H_ */
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