xref: /openbmc/linux/include/crypto/blake2s.h (revision 9a29f5fc)
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/kconfig.h>
11 #include <linux/types.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 	/* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */
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 static inline void __blake2s_init(struct blake2s_state *state, size_t outlen,
47 				  const void *key, size_t keylen)
48 {
49 	state->h[0] = BLAKE2S_IV0 ^ (0x01010000 | keylen << 8 | outlen);
50 	state->h[1] = BLAKE2S_IV1;
51 	state->h[2] = BLAKE2S_IV2;
52 	state->h[3] = BLAKE2S_IV3;
53 	state->h[4] = BLAKE2S_IV4;
54 	state->h[5] = BLAKE2S_IV5;
55 	state->h[6] = BLAKE2S_IV6;
56 	state->h[7] = BLAKE2S_IV7;
57 	state->t[0] = 0;
58 	state->t[1] = 0;
59 	state->f[0] = 0;
60 	state->f[1] = 0;
61 	state->buflen = 0;
62 	state->outlen = outlen;
63 	if (keylen) {
64 		memcpy(state->buf, key, keylen);
65 		memset(&state->buf[keylen], 0, BLAKE2S_BLOCK_SIZE - keylen);
66 		state->buflen = BLAKE2S_BLOCK_SIZE;
67 	}
68 }
69 
70 static inline void blake2s_init(struct blake2s_state *state,
71 				const size_t outlen)
72 {
73 	__blake2s_init(state, outlen, NULL, 0);
74 }
75 
76 static inline void blake2s_init_key(struct blake2s_state *state,
77 				    const size_t outlen, const void *key,
78 				    const size_t keylen)
79 {
80 	WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
81 		!key || !keylen || keylen > BLAKE2S_KEY_SIZE));
82 
83 	__blake2s_init(state, outlen, key, keylen);
84 }
85 
86 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
87 void blake2s_final(struct blake2s_state *state, u8 *out);
88 
89 static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
90 			   const size_t outlen, const size_t inlen,
91 			   const size_t keylen)
92 {
93 	struct blake2s_state state;
94 
95 	WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
96 		outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
97 		(!key && keylen)));
98 
99 	__blake2s_init(&state, outlen, key, keylen);
100 	blake2s_update(&state, in, inlen);
101 	blake2s_final(&state, out);
102 }
103 
104 #endif /* _CRYPTO_BLAKE2S_H */
105