tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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#include <crypto/internal/blake2s.h>
7#include <crypto/internal/simd.h>
8#include <crypto/internal/hash.h>
9
10#include <linux/types.h>
11#include <linux/jump_label.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14
15static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
16 unsigned int keylen)
17{
18 struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
19
20 if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE) {
21 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
22 return -EINVAL;
23 }
24
25 memcpy(tctx->key, key, keylen);
26 tctx->keylen = keylen;
27
28 return 0;
29}
30
31static int crypto_blake2s_init(struct shash_desc *desc)
32{
33 struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
34 struct blake2s_state *state = shash_desc_ctx(desc);
35 const int outlen = crypto_shash_digestsize(desc->tfm);
36
37 if (tctx->keylen)
38 blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
39 else
40 blake2s_init(state, outlen);
41
42 return 0;
43}
44
45static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
46 unsigned int inlen)
47{
48 struct blake2s_state *state = shash_desc_ctx(desc);
49 const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
50
51 if (unlikely(!inlen))
52 return 0;
53 if (inlen > fill) {
54 memcpy(state->buf + state->buflen, in, fill);
55 blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
56 state->buflen = 0;
57 in += fill;
58 inlen -= fill;
59 }
60 if (inlen > BLAKE2S_BLOCK_SIZE) {
61 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
62 /* Hash one less (full) block than strictly possible */
63 blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
64 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
65 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
66 }
67 memcpy(state->buf + state->buflen, in, inlen);
68 state->buflen += inlen;
69
70 return 0;
71}
72
73static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
74{
75 struct blake2s_state *state = shash_desc_ctx(desc);
76
77 blake2s_set_lastblock(state);
78 memset(state->buf + state->buflen, 0,
79 BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
80 blake2s_compress_generic(state, state->buf, 1, state->buflen);
81 cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
82 memcpy(out, state->h, state->outlen);
83 memzero_explicit(state, sizeof(*state));
84
85 return 0;
86}
87
88static struct shash_alg blake2s_algs[] = {{
89 .base.cra_name = "blake2s-128",
90 .base.cra_driver_name = "blake2s-128-generic",
91 .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
92 .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
93 .base.cra_priority = 200,
94 .base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
95 .base.cra_module = THIS_MODULE,
96
97 .digestsize = BLAKE2S_128_HASH_SIZE,
98 .setkey = crypto_blake2s_setkey,
99 .init = crypto_blake2s_init,
100 .update = crypto_blake2s_update,
101 .final = crypto_blake2s_final,
102 .descsize = sizeof(struct blake2s_state),
103}, {
104 .base.cra_name = "blake2s-160",
105 .base.cra_driver_name = "blake2s-160-generic",
106 .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
107 .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
108 .base.cra_priority = 200,
109 .base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
110 .base.cra_module = THIS_MODULE,
111
112 .digestsize = BLAKE2S_160_HASH_SIZE,
113 .setkey = crypto_blake2s_setkey,
114 .init = crypto_blake2s_init,
115 .update = crypto_blake2s_update,
116 .final = crypto_blake2s_final,
117 .descsize = sizeof(struct blake2s_state),
118}, {
119 .base.cra_name = "blake2s-224",
120 .base.cra_driver_name = "blake2s-224-generic",
121 .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
122 .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
123 .base.cra_priority = 200,
124 .base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
125 .base.cra_module = THIS_MODULE,
126
127 .digestsize = BLAKE2S_224_HASH_SIZE,
128 .setkey = crypto_blake2s_setkey,
129 .init = crypto_blake2s_init,
130 .update = crypto_blake2s_update,
131 .final = crypto_blake2s_final,
132 .descsize = sizeof(struct blake2s_state),
133}, {
134 .base.cra_name = "blake2s-256",
135 .base.cra_driver_name = "blake2s-256-generic",
136 .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
137 .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
138 .base.cra_priority = 200,
139 .base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
140 .base.cra_module = THIS_MODULE,
141
142 .digestsize = BLAKE2S_256_HASH_SIZE,
143 .setkey = crypto_blake2s_setkey,
144 .init = crypto_blake2s_init,
145 .update = crypto_blake2s_update,
146 .final = crypto_blake2s_final,
147 .descsize = sizeof(struct blake2s_state),
148}};
149
150static int __init blake2s_mod_init(void)
151{
152 return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
153}
154
155static void __exit blake2s_mod_exit(void)
156{
157 crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
158}
159
160subsys_initcall(blake2s_mod_init);
161module_exit(blake2s_mod_exit);
162
163MODULE_ALIAS_CRYPTO("blake2s-128");
164MODULE_ALIAS_CRYPTO("blake2s-128-generic");
165MODULE_ALIAS_CRYPTO("blake2s-160");
166MODULE_ALIAS_CRYPTO("blake2s-160-generic");
167MODULE_ALIAS_CRYPTO("blake2s-224");
168MODULE_ALIAS_CRYPTO("blake2s-224-generic");
169MODULE_ALIAS_CRYPTO("blake2s-256");
170MODULE_ALIAS_CRYPTO("blake2s-256-generic");
171MODULE_LICENSE("GPL v2");