1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2
3 #ifndef _CRYPTO_BLAKE2B_H
4 #define _CRYPTO_BLAKE2B_H
5
6 #include <linux/bug.h>
7 #include <linux/types.h>
8 #include <linux/string.h>
9
10 enum blake2b_lengths {
11 BLAKE2B_BLOCK_SIZE = 128,
12 BLAKE2B_HASH_SIZE = 64,
13 BLAKE2B_KEY_SIZE = 64,
14
15 BLAKE2B_160_HASH_SIZE = 20,
16 BLAKE2B_256_HASH_SIZE = 32,
17 BLAKE2B_384_HASH_SIZE = 48,
18 BLAKE2B_512_HASH_SIZE = 64,
19 };
20
21 struct blake2b_state {
22 /* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */
23 u64 h[8];
24 u64 t[2];
25 u64 f[2];
26 u8 buf[BLAKE2B_BLOCK_SIZE];
27 unsigned int buflen;
28 unsigned int outlen;
29 };
30
31 enum blake2b_iv {
32 BLAKE2B_IV0 = 0x6A09E667F3BCC908ULL,
33 BLAKE2B_IV1 = 0xBB67AE8584CAA73BULL,
34 BLAKE2B_IV2 = 0x3C6EF372FE94F82BULL,
35 BLAKE2B_IV3 = 0xA54FF53A5F1D36F1ULL,
36 BLAKE2B_IV4 = 0x510E527FADE682D1ULL,
37 BLAKE2B_IV5 = 0x9B05688C2B3E6C1FULL,
38 BLAKE2B_IV6 = 0x1F83D9ABFB41BD6BULL,
39 BLAKE2B_IV7 = 0x5BE0CD19137E2179ULL,
40 };
41
42 static inline void __blake2b_init(struct blake2b_state *state, size_t outlen,
43 const void *key, size_t keylen)
44 {
45 state->h[0] = BLAKE2B_IV0 ^ (0x01010000 | keylen << 8 | outlen);
46 state->h[1] = BLAKE2B_IV1;
47 state->h[2] = BLAKE2B_IV2;
48 state->h[3] = BLAKE2B_IV3;
49 state->h[4] = BLAKE2B_IV4;
50 state->h[5] = BLAKE2B_IV5;
51 state->h[6] = BLAKE2B_IV6;
52 state->h[7] = BLAKE2B_IV7;
53 state->t[0] = 0;
54 state->t[1] = 0;
55 state->f[0] = 0;
56 state->f[1] = 0;
57 state->buflen = 0;
58 state->outlen = outlen;
59 if (keylen) {
60 memcpy(state->buf, key, keylen);
61 memset(&state->buf[keylen], 0, BLAKE2B_BLOCK_SIZE - keylen);
62 state->buflen = BLAKE2B_BLOCK_SIZE;
63 }
64 }
65
66 #endif /* _CRYPTO_BLAKE2B_H */
67
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