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
6 #ifndef BLAKE2S_H
7 #define BLAKE2S_H
8
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/string.h>
12
13 #include <asm/bug.h>
14
15 enum blake2s_lengths {
16 BLAKE2S_BLOCK_SIZE = 64,
17 BLAKE2S_HASH_SIZE = 32,
18 BLAKE2S_KEY_SIZE = 32,
19
20 BLAKE2S_128_HASH_SIZE = 16,
21 BLAKE2S_160_HASH_SIZE = 20,
22 BLAKE2S_224_HASH_SIZE = 28,
23 BLAKE2S_256_HASH_SIZE = 32,
24 };
25
26 struct blake2s_state {
27 u32 h[8];
28 u32 t[2];
29 u32 f[2];
30 u8 buf[BLAKE2S_BLOCK_SIZE];
31 unsigned int buflen;
32 unsigned int outlen;
33 };
34
35 enum blake2s_iv {
36 BLAKE2S_IV0 = 0x6A09E667UL,
37 BLAKE2S_IV1 = 0xBB67AE85UL,
38 BLAKE2S_IV2 = 0x3C6EF372UL,
39 BLAKE2S_IV3 = 0xA54FF53AUL,
40 BLAKE2S_IV4 = 0x510E527FUL,
41 BLAKE2S_IV5 = 0x9B05688CUL,
42 BLAKE2S_IV6 = 0x1F83D9ABUL,
43 BLAKE2S_IV7 = 0x5BE0CD19UL,
44 };
45
46 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
47 void blake2s_final(struct blake2s_state *state, u8 *out);
48
blake2s_init_param(struct blake2s_state * state,const u32 param)49 static inline void blake2s_init_param(struct blake2s_state *state,
50 const u32 param)
51 {
52 *state = (struct blake2s_state){{
53 BLAKE2S_IV0 ^ param,
54 BLAKE2S_IV1,
55 BLAKE2S_IV2,
56 BLAKE2S_IV3,
57 BLAKE2S_IV4,
58 BLAKE2S_IV5,
59 BLAKE2S_IV6,
60 BLAKE2S_IV7,
61 }};
62 }
63
blake2s_init(struct blake2s_state * state,const size_t outlen)64 static inline void blake2s_init(struct blake2s_state *state,
65 const size_t outlen)
66 {
67 blake2s_init_param(state, 0x01010000 | outlen);
68 state->outlen = outlen;
69 }
70
blake2s_init_key(struct blake2s_state * state,const size_t outlen,const void * key,const size_t keylen)71 static inline void blake2s_init_key(struct blake2s_state *state,
72 const size_t outlen, const void *key,
73 const size_t keylen)
74 {
75 WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
76 !key || !keylen || keylen > BLAKE2S_KEY_SIZE));
77
78 blake2s_init_param(state, 0x01010000 | keylen << 8 | outlen);
79 memcpy(state->buf, key, keylen);
80 state->buflen = BLAKE2S_BLOCK_SIZE;
81 state->outlen = outlen;
82 }
83
blake2s(u8 * out,const u8 * in,const u8 * key,const size_t outlen,const size_t inlen,const size_t keylen)84 static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
85 const size_t outlen, const size_t inlen,
86 const size_t keylen)
87 {
88 struct blake2s_state state;
89
90 WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
91 outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
92 (!key && keylen)));
93
94 if (keylen)
95 blake2s_init_key(&state, outlen, key, keylen);
96 else
97 blake2s_init(&state, outlen);
98
99 blake2s_update(&state, in, inlen);
100 blake2s_final(&state, out);
101 }
102
103 void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
104 const size_t keylen);
105
106 #endif /* BLAKE2S_H */
107
