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
14enum 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
25struct 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
35enum 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
46static 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
70static inline void blake2s_init(struct blake2s_state *state,
71				const size_t outlen)
72{
73	__blake2s_init(state, outlen, NULL, 0);
74}
75
76static 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
86void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
87void blake2s_final(struct blake2s_state *state, u8 *out);
88
89static 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