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
10enum 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
21struct 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
31enum 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
42static 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