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055bcee3 HX |
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 <linux/errno.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
791b4d5f | 15 | #include <linux/slab.h> |
055bcee3 HX |
16 | #include <linux/seq_file.h> |
17 | ||
18 | #include "internal.h" | |
19 | ||
27d2a330 HX |
20 | static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type, |
21 | u32 mask) | |
055bcee3 HX |
22 | { |
23 | return alg->cra_ctxsize; | |
24 | } | |
25 | ||
ca7c3938 SS |
26 | static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key, |
27 | unsigned int keylen) | |
28 | { | |
29 | struct crypto_tfm *tfm = crypto_hash_tfm(crt); | |
30 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
31 | unsigned long alignmask = crypto_hash_alignmask(crt); | |
32 | int ret; | |
33 | u8 *buffer, *alignbuffer; | |
34 | unsigned long absize; | |
35 | ||
36 | absize = keylen + alignmask; | |
37 | buffer = kmalloc(absize, GFP_ATOMIC); | |
38 | if (!buffer) | |
39 | return -ENOMEM; | |
40 | ||
41 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
42 | memcpy(alignbuffer, key, keylen); | |
43 | ret = alg->setkey(crt, alignbuffer, keylen); | |
06817176 | 44 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
45 | kfree(buffer); |
46 | return ret; | |
47 | } | |
48 | ||
49 | static int hash_setkey(struct crypto_hash *crt, const u8 *key, | |
791b4d5f | 50 | unsigned int keylen) |
ca7c3938 SS |
51 | { |
52 | struct crypto_tfm *tfm = crypto_hash_tfm(crt); | |
53 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
54 | unsigned long alignmask = crypto_hash_alignmask(crt); | |
55 | ||
56 | if ((unsigned long)key & alignmask) | |
57 | return hash_setkey_unaligned(crt, key, keylen); | |
58 | ||
59 | return alg->setkey(crt, key, keylen); | |
60 | } | |
61 | ||
004a403c LH |
62 | static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key, |
63 | unsigned int keylen) | |
64 | { | |
65 | struct crypto_tfm *tfm = crypto_ahash_tfm(tfm_async); | |
66 | struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm); | |
67 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
68 | ||
69 | return alg->setkey(tfm_hash, key, keylen); | |
70 | } | |
71 | ||
72 | static int hash_async_init(struct ahash_request *req) | |
73 | { | |
74 | struct crypto_tfm *tfm = req->base.tfm; | |
75 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
76 | struct hash_desc desc = { | |
77 | .tfm = __crypto_hash_cast(tfm), | |
78 | .flags = req->base.flags, | |
79 | }; | |
80 | ||
81 | return alg->init(&desc); | |
82 | } | |
83 | ||
84 | static int hash_async_update(struct ahash_request *req) | |
85 | { | |
86 | struct crypto_tfm *tfm = req->base.tfm; | |
87 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
88 | struct hash_desc desc = { | |
89 | .tfm = __crypto_hash_cast(tfm), | |
90 | .flags = req->base.flags, | |
91 | }; | |
92 | ||
93 | return alg->update(&desc, req->src, req->nbytes); | |
94 | } | |
95 | ||
96 | static int hash_async_final(struct ahash_request *req) | |
97 | { | |
98 | struct crypto_tfm *tfm = req->base.tfm; | |
99 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
100 | struct hash_desc desc = { | |
101 | .tfm = __crypto_hash_cast(tfm), | |
102 | .flags = req->base.flags, | |
103 | }; | |
104 | ||
105 | return alg->final(&desc, req->result); | |
106 | } | |
107 | ||
108 | static int hash_async_digest(struct ahash_request *req) | |
109 | { | |
110 | struct crypto_tfm *tfm = req->base.tfm; | |
111 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
112 | struct hash_desc desc = { | |
113 | .tfm = __crypto_hash_cast(tfm), | |
114 | .flags = req->base.flags, | |
115 | }; | |
116 | ||
117 | return alg->digest(&desc, req->src, req->nbytes, req->result); | |
118 | } | |
119 | ||
120 | static int crypto_init_hash_ops_async(struct crypto_tfm *tfm) | |
121 | { | |
122 | struct ahash_tfm *crt = &tfm->crt_ahash; | |
123 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
124 | ||
125 | crt->init = hash_async_init; | |
126 | crt->update = hash_async_update; | |
127 | crt->final = hash_async_final; | |
128 | crt->digest = hash_async_digest; | |
129 | crt->setkey = hash_async_setkey; | |
130 | crt->digestsize = alg->digestsize; | |
131 | crt->base = __crypto_ahash_cast(tfm); | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm) | |
055bcee3 HX |
137 | { |
138 | struct hash_tfm *crt = &tfm->crt_hash; | |
139 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
140 | ||
004a403c LH |
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; | |
055bcee3 HX |
146 | crt->digestsize = alg->digestsize; |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
004a403c LH |
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 > crypto_tfm_alg_blocksize(tfm)) | |
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 | ||
055bcee3 | 164 | static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg) |
03f5d8ce | 165 | __attribute__ ((unused)); |
055bcee3 HX |
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"); |