Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
[linux-2.6-microblaze.git] / crypto / blake2s_generic.c
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
15 static 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                 return -EINVAL;
22
23         memcpy(tctx->key, key, keylen);
24         tctx->keylen = keylen;
25
26         return 0;
27 }
28
29 static int crypto_blake2s_init(struct shash_desc *desc)
30 {
31         struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
32         struct blake2s_state *state = shash_desc_ctx(desc);
33         const int outlen = crypto_shash_digestsize(desc->tfm);
34
35         if (tctx->keylen)
36                 blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
37         else
38                 blake2s_init(state, outlen);
39
40         return 0;
41 }
42
43 static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
44                                  unsigned int inlen)
45 {
46         struct blake2s_state *state = shash_desc_ctx(desc);
47         const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
48
49         if (unlikely(!inlen))
50                 return 0;
51         if (inlen > fill) {
52                 memcpy(state->buf + state->buflen, in, fill);
53                 blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
54                 state->buflen = 0;
55                 in += fill;
56                 inlen -= fill;
57         }
58         if (inlen > BLAKE2S_BLOCK_SIZE) {
59                 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
60                 /* Hash one less (full) block than strictly possible */
61                 blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
62                 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
63                 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
64         }
65         memcpy(state->buf + state->buflen, in, inlen);
66         state->buflen += inlen;
67
68         return 0;
69 }
70
71 static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
72 {
73         struct blake2s_state *state = shash_desc_ctx(desc);
74
75         blake2s_set_lastblock(state);
76         memset(state->buf + state->buflen, 0,
77                BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
78         blake2s_compress_generic(state, state->buf, 1, state->buflen);
79         cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
80         memcpy(out, state->h, state->outlen);
81         memzero_explicit(state, sizeof(*state));
82
83         return 0;
84 }
85
86 static struct shash_alg blake2s_algs[] = {{
87         .base.cra_name          = "blake2s-128",
88         .base.cra_driver_name   = "blake2s-128-generic",
89         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
90         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
91         .base.cra_priority      = 200,
92         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
93         .base.cra_module        = THIS_MODULE,
94
95         .digestsize             = BLAKE2S_128_HASH_SIZE,
96         .setkey                 = crypto_blake2s_setkey,
97         .init                   = crypto_blake2s_init,
98         .update                 = crypto_blake2s_update,
99         .final                  = crypto_blake2s_final,
100         .descsize               = sizeof(struct blake2s_state),
101 }, {
102         .base.cra_name          = "blake2s-160",
103         .base.cra_driver_name   = "blake2s-160-generic",
104         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
105         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
106         .base.cra_priority      = 200,
107         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
108         .base.cra_module        = THIS_MODULE,
109
110         .digestsize             = BLAKE2S_160_HASH_SIZE,
111         .setkey                 = crypto_blake2s_setkey,
112         .init                   = crypto_blake2s_init,
113         .update                 = crypto_blake2s_update,
114         .final                  = crypto_blake2s_final,
115         .descsize               = sizeof(struct blake2s_state),
116 }, {
117         .base.cra_name          = "blake2s-224",
118         .base.cra_driver_name   = "blake2s-224-generic",
119         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
120         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
121         .base.cra_priority      = 200,
122         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
123         .base.cra_module        = THIS_MODULE,
124
125         .digestsize             = BLAKE2S_224_HASH_SIZE,
126         .setkey                 = crypto_blake2s_setkey,
127         .init                   = crypto_blake2s_init,
128         .update                 = crypto_blake2s_update,
129         .final                  = crypto_blake2s_final,
130         .descsize               = sizeof(struct blake2s_state),
131 }, {
132         .base.cra_name          = "blake2s-256",
133         .base.cra_driver_name   = "blake2s-256-generic",
134         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
135         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
136         .base.cra_priority      = 200,
137         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
138         .base.cra_module        = THIS_MODULE,
139
140         .digestsize             = BLAKE2S_256_HASH_SIZE,
141         .setkey                 = crypto_blake2s_setkey,
142         .init                   = crypto_blake2s_init,
143         .update                 = crypto_blake2s_update,
144         .final                  = crypto_blake2s_final,
145         .descsize               = sizeof(struct blake2s_state),
146 }};
147
148 static int __init blake2s_mod_init(void)
149 {
150         return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
151 }
152
153 static void __exit blake2s_mod_exit(void)
154 {
155         crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
156 }
157
158 subsys_initcall(blake2s_mod_init);
159 module_exit(blake2s_mod_exit);
160
161 MODULE_ALIAS_CRYPTO("blake2s-128");
162 MODULE_ALIAS_CRYPTO("blake2s-128-generic");
163 MODULE_ALIAS_CRYPTO("blake2s-160");
164 MODULE_ALIAS_CRYPTO("blake2s-160-generic");
165 MODULE_ALIAS_CRYPTO("blake2s-224");
166 MODULE_ALIAS_CRYPTO("blake2s-224-generic");
167 MODULE_ALIAS_CRYPTO("blake2s-256");
168 MODULE_ALIAS_CRYPTO("blake2s-256-generic");
169 MODULE_LICENSE("GPL v2");