1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright Amazon.com Inc. or its affiliates. */
 3
 4#ifndef _TEST_SIPHASH_H
 5#define _TEST_SIPHASH_H
 6
 7/* include/linux/bitops.h */
 8static inline u64 rol64(u64 word, unsigned int shift)
 9{
10	return (word << (shift & 63)) | (word >> ((-shift) & 63));
11}
12
13/* include/linux/siphash.h */
14#define SIPHASH_PERMUTATION(a, b, c, d) ( \
15	(a) += (b), (b) = rol64((b), 13), (b) ^= (a), (a) = rol64((a), 32), \
16	(c) += (d), (d) = rol64((d), 16), (d) ^= (c), \
17	(a) += (d), (d) = rol64((d), 21), (d) ^= (a), \
18	(c) += (b), (b) = rol64((b), 17), (b) ^= (c), (c) = rol64((c), 32))
19
20#define SIPHASH_CONST_0 0x736f6d6570736575ULL
21#define SIPHASH_CONST_1 0x646f72616e646f6dULL
22#define SIPHASH_CONST_2 0x6c7967656e657261ULL
23#define SIPHASH_CONST_3 0x7465646279746573ULL
24
25/* lib/siphash.c */
26#define SIPROUND SIPHASH_PERMUTATION(v0, v1, v2, v3)
27
28#define PREAMBLE(len) \
29	u64 v0 = SIPHASH_CONST_0; \
30	u64 v1 = SIPHASH_CONST_1; \
31	u64 v2 = SIPHASH_CONST_2; \
32	u64 v3 = SIPHASH_CONST_3; \
33	u64 b = ((u64)(len)) << 56; \
34	v3 ^= key->key[1]; \
35	v2 ^= key->key[0]; \
36	v1 ^= key->key[1]; \
37	v0 ^= key->key[0];
38
39#define POSTAMBLE \
40	v3 ^= b; \
41	SIPROUND; \
42	SIPROUND; \
43	v0 ^= b; \
44	v2 ^= 0xff; \
45	SIPROUND; \
46	SIPROUND; \
47	SIPROUND; \
48	SIPROUND; \
49	return (v0 ^ v1) ^ (v2 ^ v3);
50
51static inline u64 siphash_2u64(const u64 first, const u64 second, const siphash_key_t *key)
52{
53	PREAMBLE(16)
54	v3 ^= first;
55	SIPROUND;
56	SIPROUND;
57	v0 ^= first;
58	v3 ^= second;
59	SIPROUND;
60	SIPROUND;
61	v0 ^= second;
62	POSTAMBLE
63}
64#endif