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66d7fb94 JD |
1 | // SPDX-License-Identifier: GPL-2.0 OR MIT |
2 | /* | |
3 | * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. | |
4 | * | |
5 | * This is an implementation of the BLAKE2s hash and PRF functions. | |
6 | * | |
7 | * Information: https://blake2.net/ | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <crypto/internal/blake2s.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/bug.h> | |
18 | #include <asm/unaligned.h> | |
19 | ||
20 | static const u8 blake2s_sigma[10][16] = { | |
21 | { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, | |
22 | { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }, | |
23 | { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 }, | |
24 | { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 }, | |
25 | { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 }, | |
26 | { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 }, | |
27 | { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 }, | |
28 | { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 }, | |
29 | { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 }, | |
30 | { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 }, | |
31 | }; | |
32 | ||
33 | static inline void blake2s_increment_counter(struct blake2s_state *state, | |
34 | const u32 inc) | |
35 | { | |
36 | state->t[0] += inc; | |
37 | state->t[1] += (state->t[0] < inc); | |
38 | } | |
39 | ||
6048fdcc JD |
40 | void blake2s_compress(struct blake2s_state *state, const u8 *block, |
41 | size_t nblocks, const u32 inc) | |
42 | __weak __alias(blake2s_compress_generic); | |
43 | ||
44 | void blake2s_compress_generic(struct blake2s_state *state, const u8 *block, | |
66d7fb94 JD |
45 | size_t nblocks, const u32 inc) |
46 | { | |
47 | u32 m[16]; | |
48 | u32 v[16]; | |
49 | int i; | |
50 | ||
51 | WARN_ON(IS_ENABLED(DEBUG) && | |
52 | (nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE)); | |
53 | ||
54 | while (nblocks > 0) { | |
55 | blake2s_increment_counter(state, inc); | |
56 | memcpy(m, block, BLAKE2S_BLOCK_SIZE); | |
57 | le32_to_cpu_array(m, ARRAY_SIZE(m)); | |
58 | memcpy(v, state->h, 32); | |
59 | v[ 8] = BLAKE2S_IV0; | |
60 | v[ 9] = BLAKE2S_IV1; | |
61 | v[10] = BLAKE2S_IV2; | |
62 | v[11] = BLAKE2S_IV3; | |
63 | v[12] = BLAKE2S_IV4 ^ state->t[0]; | |
64 | v[13] = BLAKE2S_IV5 ^ state->t[1]; | |
65 | v[14] = BLAKE2S_IV6 ^ state->f[0]; | |
66 | v[15] = BLAKE2S_IV7 ^ state->f[1]; | |
67 | ||
68 | #define G(r, i, a, b, c, d) do { \ | |
69 | a += b + m[blake2s_sigma[r][2 * i + 0]]; \ | |
70 | d = ror32(d ^ a, 16); \ | |
71 | c += d; \ | |
72 | b = ror32(b ^ c, 12); \ | |
73 | a += b + m[blake2s_sigma[r][2 * i + 1]]; \ | |
74 | d = ror32(d ^ a, 8); \ | |
75 | c += d; \ | |
76 | b = ror32(b ^ c, 7); \ | |
77 | } while (0) | |
78 | ||
79 | #define ROUND(r) do { \ | |
80 | G(r, 0, v[0], v[ 4], v[ 8], v[12]); \ | |
81 | G(r, 1, v[1], v[ 5], v[ 9], v[13]); \ | |
82 | G(r, 2, v[2], v[ 6], v[10], v[14]); \ | |
83 | G(r, 3, v[3], v[ 7], v[11], v[15]); \ | |
84 | G(r, 4, v[0], v[ 5], v[10], v[15]); \ | |
85 | G(r, 5, v[1], v[ 6], v[11], v[12]); \ | |
86 | G(r, 6, v[2], v[ 7], v[ 8], v[13]); \ | |
87 | G(r, 7, v[3], v[ 4], v[ 9], v[14]); \ | |
88 | } while (0) | |
89 | ROUND(0); | |
90 | ROUND(1); | |
91 | ROUND(2); | |
92 | ROUND(3); | |
93 | ROUND(4); | |
94 | ROUND(5); | |
95 | ROUND(6); | |
96 | ROUND(7); | |
97 | ROUND(8); | |
98 | ROUND(9); | |
99 | ||
100 | #undef G | |
101 | #undef ROUND | |
102 | ||
103 | for (i = 0; i < 8; ++i) | |
104 | state->h[i] ^= v[i] ^ v[i + 8]; | |
105 | ||
106 | block += BLAKE2S_BLOCK_SIZE; | |
107 | --nblocks; | |
108 | } | |
109 | } | |
110 | ||
111 | EXPORT_SYMBOL(blake2s_compress_generic); | |
112 | ||
113 | MODULE_LICENSE("GPL v2"); | |
114 | MODULE_DESCRIPTION("BLAKE2s hash function"); | |
115 | MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>"); |