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Linux kernel mirror (for testing)
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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 * This is an implementation of the BLAKE2s hash and PRF functions.
6 *
7 * Information: https://blake2.net/
8 *
9 */
10
11#include <crypto/internal/blake2s.h>
12#include <linux/bug.h>
13#include <linux/export.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/string.h>
18#include <linux/types.h>
19
20static inline void blake2s_set_lastblock(struct blake2s_state *state)
21{
22 state->f[0] = -1;
23}
24
25void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)
26{
27 const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
28
29 if (unlikely(!inlen))
30 return;
31 if (inlen > fill) {
32 memcpy(state->buf + state->buflen, in, fill);
33 blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
34 state->buflen = 0;
35 in += fill;
36 inlen -= fill;
37 }
38 if (inlen > BLAKE2S_BLOCK_SIZE) {
39 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
40 blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
41 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
42 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
43 }
44 memcpy(state->buf + state->buflen, in, inlen);
45 state->buflen += inlen;
46}
47EXPORT_SYMBOL(blake2s_update);
48
49void blake2s_final(struct blake2s_state *state, u8 *out)
50{
51 WARN_ON(IS_ENABLED(DEBUG) && !out);
52 blake2s_set_lastblock(state);
53 memset(state->buf + state->buflen, 0,
54 BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
55 blake2s_compress(state, state->buf, 1, state->buflen);
56 cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
57 memcpy(out, state->h, state->outlen);
58 memzero_explicit(state, sizeof(*state));
59}
60EXPORT_SYMBOL(blake2s_final);
61
62static int __init blake2s_mod_init(void)
63{
64 if (IS_ENABLED(CONFIG_CRYPTO_SELFTESTS) &&
65 WARN_ON(!blake2s_selftest()))
66 return -ENODEV;
67 return 0;
68}
69
70module_init(blake2s_mod_init);
71MODULE_DESCRIPTION("BLAKE2s hash function");
72MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");