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 _CRYPTO_BLAKE2S_H
7 #define _CRYPTO_BLAKE2S_H
8
9 #include <linux/bug.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13
14 enum blake2s_lengths {
15 BLAKE2S_BLOCK_SIZE = 64,
16 BLAKE2S_HASH_SIZE = 32,
17 BLAKE2S_KEY_SIZE = 32,
18
19 BLAKE2S_128_HASH_SIZE = 16,
20 BLAKE2S_160_HASH_SIZE = 20,
21 BLAKE2S_224_HASH_SIZE = 28,
22 BLAKE2S_256_HASH_SIZE = 32,
23 };
24
25 struct blake2s_state {
26 u32 h[8];
27 u32 t[2];
28 u32 f[2];
29 u8 buf[BLAKE2S_BLOCK_SIZE];
30 unsigned int buflen;
31 unsigned int outlen;
32 };
33
34 enum blake2s_iv {
35 BLAKE2S_IV0 = 0x6A09E667UL,
36 BLAKE2S_IV1 = 0xBB67AE85UL,
37 BLAKE2S_IV2 = 0x3C6EF372UL,
38 BLAKE2S_IV3 = 0xA54FF53AUL,
39 BLAKE2S_IV4 = 0x510E527FUL,
40 BLAKE2S_IV5 = 0x9B05688CUL,
41 BLAKE2S_IV6 = 0x1F83D9ABUL,
42 BLAKE2S_IV7 = 0x5BE0CD19UL,
43 };
44
45 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
46 void blake2s_final(struct blake2s_state *state, u8 *out);
47
blake2s_init_param(struct blake2s_state * state,const u32 param)48 static inline void blake2s_init_param(struct blake2s_state *state,
49 const u32 param)
50 {
51 *state = (struct blake2s_state){{
52 BLAKE2S_IV0 ^ param,
53 BLAKE2S_IV1,
54 BLAKE2S_IV2,
55 BLAKE2S_IV3,
56 BLAKE2S_IV4,
57 BLAKE2S_IV5,
58 BLAKE2S_IV6,
59 BLAKE2S_IV7,
60 }};
61 }
62
blake2s_init(struct blake2s_state * state,const size_t outlen)63 static inline void blake2s_init(struct blake2s_state *state,
64 const size_t outlen)
65 {
66 blake2s_init_param(state, 0x01010000 | outlen);
67 state->outlen = outlen;
68 }
69
blake2s_init_key(struct blake2s_state * state,const size_t outlen,const void * key,const size_t keylen)70 static inline void blake2s_init_key(struct blake2s_state *state,
71 const size_t outlen, const void *key,
72 const size_t keylen)
73 {
74 WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
75 !key || !keylen || keylen > BLAKE2S_KEY_SIZE));
76
77 blake2s_init_param(state, 0x01010000 | keylen << 8 | outlen);
78 memcpy(state->buf, key, keylen);
79 state->buflen = BLAKE2S_BLOCK_SIZE;
80 state->outlen = outlen;
81 }
82
blake2s(u8 * out,const u8 * in,const u8 * key,const size_t outlen,const size_t inlen,const size_t keylen)83 static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
84 const size_t outlen, const size_t inlen,
85 const size_t keylen)
86 {
87 struct blake2s_state state;
88
89 WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
90 outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
91 (!key && keylen)));
92
93 if (keylen)
94 blake2s_init_key(&state, outlen, key, keylen);
95 else
96 blake2s_init(&state, outlen);
97
98 blake2s_update(&state, in, inlen);
99 blake2s_final(&state, out);
100 }
101
102 #endif /* _CRYPTO_BLAKE2S_H */
103