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1 | /* |
2 | * Cryptographic Hash operations. |
3 | * |
4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it |
7 | * under the terms of the GNU General Public License as published by the Free |
8 | * Software Foundation; either version 2 of the License, or (at your option) |
9 | * any later version. |
10 | */ |
11 | |
12 | #include <crypto/internal/hash.h> |
13 | #include <linux/errno.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/seq_file.h> |
18 | |
19 | #include "internal.h" |
20 | |
21 | static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type, |
22 | u32 mask) |
23 | { |
24 | return alg->cra_ctxsize; |
25 | } |
26 | |
27 | static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key, |
28 | unsigned int keylen) |
29 | { |
30 | struct crypto_tfm *tfm = crypto_hash_tfm(crt); |
31 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
32 | unsigned long alignmask = crypto_hash_alignmask(crt); |
33 | int ret; |
34 | u8 *buffer, *alignbuffer; |
35 | unsigned long absize; |
36 | |
37 | absize = keylen + alignmask; |
38 | buffer = kmalloc(absize, GFP_ATOMIC); |
39 | if (!buffer) |
40 | return -ENOMEM; |
41 | |
42 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
43 | memcpy(alignbuffer, key, keylen); |
44 | ret = alg->setkey(crt, alignbuffer, keylen); |
45 | memset(alignbuffer, 0, keylen); |
46 | kfree(buffer); |
47 | return ret; |
48 | } |
49 | |
50 | static int hash_setkey(struct crypto_hash *crt, const u8 *key, |
51 | unsigned int keylen) |
52 | { |
53 | struct crypto_tfm *tfm = crypto_hash_tfm(crt); |
54 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
55 | unsigned long alignmask = crypto_hash_alignmask(crt); |
56 | |
57 | if ((unsigned long)key & alignmask) |
58 | return hash_setkey_unaligned(crt, key, keylen); |
59 | |
60 | return alg->setkey(crt, key, keylen); |
61 | } |
62 | |
63 | static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key, |
64 | unsigned int keylen) |
65 | { |
66 | struct crypto_tfm *tfm = crypto_ahash_tfm(tfm_async); |
67 | struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm); |
68 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
69 | |
70 | return alg->setkey(tfm_hash, key, keylen); |
71 | } |
72 | |
73 | static int hash_async_init(struct ahash_request *req) |
74 | { |
75 | struct crypto_tfm *tfm = req->base.tfm; |
76 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
77 | struct hash_desc desc = { |
78 | .tfm = __crypto_hash_cast(tfm), |
79 | .flags = req->base.flags, |
80 | }; |
81 | |
82 | return alg->init(&desc); |
83 | } |
84 | |
85 | static int hash_async_update(struct ahash_request *req) |
86 | { |
87 | struct crypto_tfm *tfm = req->base.tfm; |
88 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
89 | struct hash_desc desc = { |
90 | .tfm = __crypto_hash_cast(tfm), |
91 | .flags = req->base.flags, |
92 | }; |
93 | |
94 | return alg->update(&desc, req->src, req->nbytes); |
95 | } |
96 | |
97 | static int hash_async_final(struct ahash_request *req) |
98 | { |
99 | struct crypto_tfm *tfm = req->base.tfm; |
100 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
101 | struct hash_desc desc = { |
102 | .tfm = __crypto_hash_cast(tfm), |
103 | .flags = req->base.flags, |
104 | }; |
105 | |
106 | return alg->final(&desc, req->result); |
107 | } |
108 | |
109 | static int hash_async_digest(struct ahash_request *req) |
110 | { |
111 | struct crypto_tfm *tfm = req->base.tfm; |
112 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
113 | struct hash_desc desc = { |
114 | .tfm = __crypto_hash_cast(tfm), |
115 | .flags = req->base.flags, |
116 | }; |
117 | |
118 | return alg->digest(&desc, req->src, req->nbytes, req->result); |
119 | } |
120 | |
121 | static int crypto_init_hash_ops_async(struct crypto_tfm *tfm) |
122 | { |
123 | struct ahash_tfm *crt = &tfm->crt_ahash; |
124 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
125 | |
126 | crt->init = hash_async_init; |
127 | crt->update = hash_async_update; |
128 | crt->final = hash_async_final; |
129 | crt->digest = hash_async_digest; |
130 | crt->setkey = hash_async_setkey; |
131 | crt->digestsize = alg->digestsize; |
132 | |
133 | return 0; |
134 | } |
135 | |
136 | static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm) |
137 | { |
138 | struct hash_tfm *crt = &tfm->crt_hash; |
139 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
140 | |
141 | crt->init = alg->init; |
142 | crt->update = alg->update; |
143 | crt->final = alg->final; |
144 | crt->digest = alg->digest; |
145 | crt->setkey = hash_setkey; |
146 | crt->digestsize = alg->digestsize; |
147 | |
148 | return 0; |
149 | } |
150 | |
151 | static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
152 | { |
153 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; |
154 | |
155 | if (alg->digestsize > PAGE_SIZE / 8) |
156 | return -EINVAL; |
157 | |
158 | if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK) |
159 | return crypto_init_hash_ops_async(tfm); |
160 | else |
161 | return crypto_init_hash_ops_sync(tfm); |
162 | } |
163 | |
164 | static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg) |
165 | __attribute__ ((unused)); |
166 | static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg) |
167 | { |
168 | seq_printf(m, "type : hash\n"); |
169 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
170 | seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize); |
171 | } |
172 | |
173 | const struct crypto_type crypto_hash_type = { |
174 | .ctxsize = crypto_hash_ctxsize, |
175 | .init = crypto_init_hash_ops, |
176 | #ifdef CONFIG_PROC_FS |
177 | .show = crypto_hash_show, |
178 | #endif |
179 | }; |
180 | EXPORT_SYMBOL_GPL(crypto_hash_type); |
181 | |
182 | MODULE_LICENSE("GPL"); |
183 | MODULE_DESCRIPTION("Generic cryptographic hash type"); |
184 |
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