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