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cce9e06d HX |
1 | /* |
2 | * Cryptographic API for algorithms (i.e., low-level API). | |
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 | ||
13 | #include <linux/errno.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/kernel.h> | |
4cc7720c | 16 | #include <linux/list.h> |
cce9e06d HX |
17 | #include <linux/module.h> |
18 | #include <linux/string.h> | |
19 | ||
20 | #include "internal.h" | |
21 | ||
4cc7720c HX |
22 | static LIST_HEAD(crypto_template_list); |
23 | ||
2825982d HX |
24 | void crypto_larval_error(const char *name) |
25 | { | |
26 | struct crypto_alg *alg; | |
27 | ||
28 | down_read(&crypto_alg_sem); | |
29 | alg = __crypto_alg_lookup(name); | |
30 | up_read(&crypto_alg_sem); | |
31 | ||
32 | if (alg) { | |
33 | if (crypto_is_larval(alg)) { | |
34 | struct crypto_larval *larval = (void *)alg; | |
35 | complete(&larval->completion); | |
36 | } | |
37 | crypto_mod_put(alg); | |
38 | } | |
39 | } | |
40 | EXPORT_SYMBOL_GPL(crypto_larval_error); | |
41 | ||
cce9e06d HX |
42 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
43 | { | |
44 | static const char suffix[] = "-generic"; | |
45 | char *driver_name = alg->cra_driver_name; | |
46 | int len; | |
47 | ||
48 | if (*driver_name) | |
49 | return 0; | |
50 | ||
51 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
52 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
53 | return -ENAMETOOLONG; | |
54 | ||
55 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
56 | return 0; | |
57 | } | |
58 | ||
4cc7720c | 59 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 60 | { |
cce9e06d HX |
61 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
62 | return -EINVAL; | |
63 | ||
64 | if (alg->cra_alignmask & alg->cra_blocksize) | |
65 | return -EINVAL; | |
66 | ||
67 | if (alg->cra_blocksize > PAGE_SIZE / 8) | |
68 | return -EINVAL; | |
69 | ||
70 | if (alg->cra_priority < 0) | |
71 | return -EINVAL; | |
cce9e06d | 72 | |
4cc7720c HX |
73 | return crypto_set_driver_name(alg); |
74 | } | |
75 | ||
76 | static int __crypto_register_alg(struct crypto_alg *alg) | |
77 | { | |
78 | struct crypto_alg *q; | |
79 | int ret = -EEXIST; | |
80 | ||
2825982d | 81 | atomic_set(&alg->cra_refcnt, 1); |
cce9e06d | 82 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 83 | if (q == alg) |
cce9e06d | 84 | goto out; |
2825982d HX |
85 | if (crypto_is_larval(q) && |
86 | (!strcmp(alg->cra_name, q->cra_name) || | |
87 | !strcmp(alg->cra_driver_name, q->cra_name))) { | |
88 | struct crypto_larval *larval = (void *)q; | |
89 | ||
90 | if (!crypto_mod_get(alg)) | |
91 | continue; | |
92 | larval->adult = alg; | |
93 | complete(&larval->completion); | |
94 | } | |
cce9e06d HX |
95 | } |
96 | ||
97 | list_add(&alg->cra_list, &crypto_alg_list); | |
2825982d HX |
98 | |
99 | crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg); | |
4cc7720c | 100 | ret = 0; |
2825982d | 101 | |
cce9e06d | 102 | out: |
cce9e06d HX |
103 | return ret; |
104 | } | |
4cc7720c HX |
105 | |
106 | int crypto_register_alg(struct crypto_alg *alg) | |
107 | { | |
108 | int err; | |
109 | ||
110 | err = crypto_check_alg(alg); | |
111 | if (err) | |
112 | return err; | |
113 | ||
114 | down_write(&crypto_alg_sem); | |
115 | err = __crypto_register_alg(alg); | |
116 | up_write(&crypto_alg_sem); | |
117 | ||
118 | return err; | |
119 | } | |
cce9e06d HX |
120 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
121 | ||
122 | int crypto_unregister_alg(struct crypto_alg *alg) | |
123 | { | |
124 | int ret = -ENOENT; | |
cce9e06d HX |
125 | |
126 | down_write(&crypto_alg_sem); | |
4cc7720c HX |
127 | if (likely(!list_empty(&alg->cra_list))) { |
128 | list_del_init(&alg->cra_list); | |
129 | ret = 0; | |
cce9e06d | 130 | } |
2825982d | 131 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); |
cce9e06d HX |
132 | up_write(&crypto_alg_sem); |
133 | ||
134 | if (ret) | |
135 | return ret; | |
136 | ||
137 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
138 | if (alg->cra_destroy) | |
139 | alg->cra_destroy(alg); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
144 | ||
4cc7720c HX |
145 | int crypto_register_template(struct crypto_template *tmpl) |
146 | { | |
147 | struct crypto_template *q; | |
148 | int err = -EEXIST; | |
149 | ||
150 | down_write(&crypto_alg_sem); | |
151 | ||
152 | list_for_each_entry(q, &crypto_template_list, list) { | |
153 | if (q == tmpl) | |
154 | goto out; | |
155 | } | |
156 | ||
157 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 158 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
159 | err = 0; |
160 | out: | |
161 | up_write(&crypto_alg_sem); | |
162 | return err; | |
163 | } | |
164 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
165 | ||
166 | void crypto_unregister_template(struct crypto_template *tmpl) | |
167 | { | |
168 | struct crypto_instance *inst; | |
169 | struct hlist_node *p, *n; | |
170 | struct hlist_head *list; | |
171 | ||
172 | down_write(&crypto_alg_sem); | |
173 | ||
174 | BUG_ON(list_empty(&tmpl->list)); | |
175 | list_del_init(&tmpl->list); | |
176 | ||
177 | list = &tmpl->instances; | |
178 | hlist_for_each_entry(inst, p, list, list) { | |
179 | BUG_ON(list_empty(&inst->alg.cra_list)); | |
180 | list_del_init(&inst->alg.cra_list); | |
2825982d | 181 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); |
4cc7720c HX |
182 | } |
183 | ||
2825982d HX |
184 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
185 | ||
4cc7720c HX |
186 | up_write(&crypto_alg_sem); |
187 | ||
188 | hlist_for_each_entry_safe(inst, p, n, list, list) { | |
189 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); | |
190 | tmpl->free(inst); | |
191 | } | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
194 | ||
195 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
196 | { | |
197 | struct crypto_template *q, *tmpl = NULL; | |
198 | ||
199 | down_read(&crypto_alg_sem); | |
200 | list_for_each_entry(q, &crypto_template_list, list) { | |
201 | if (strcmp(q->name, name)) | |
202 | continue; | |
203 | if (unlikely(!crypto_tmpl_get(q))) | |
204 | continue; | |
205 | ||
206 | tmpl = q; | |
207 | break; | |
208 | } | |
209 | up_read(&crypto_alg_sem); | |
210 | ||
211 | return tmpl; | |
212 | } | |
213 | ||
214 | struct crypto_template *crypto_lookup_template(const char *name) | |
215 | { | |
216 | return try_then_request_module(__crypto_lookup_template(name), name); | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
219 | ||
220 | int crypto_register_instance(struct crypto_template *tmpl, | |
221 | struct crypto_instance *inst) | |
222 | { | |
223 | int err = -EINVAL; | |
224 | ||
225 | if (inst->alg.cra_destroy) | |
226 | goto err; | |
227 | ||
228 | err = crypto_check_alg(&inst->alg); | |
229 | if (err) | |
230 | goto err; | |
231 | ||
232 | inst->alg.cra_module = tmpl->module; | |
233 | ||
234 | down_write(&crypto_alg_sem); | |
235 | ||
236 | err = __crypto_register_alg(&inst->alg); | |
237 | if (err) | |
238 | goto unlock; | |
239 | ||
240 | hlist_add_head(&inst->list, &tmpl->instances); | |
241 | inst->tmpl = tmpl; | |
242 | ||
243 | unlock: | |
244 | up_write(&crypto_alg_sem); | |
245 | ||
246 | err: | |
247 | return err; | |
248 | } | |
249 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
250 | ||
2825982d HX |
251 | int crypto_register_notifier(struct notifier_block *nb) |
252 | { | |
253 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
254 | } | |
255 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
256 | ||
257 | int crypto_unregister_notifier(struct notifier_block *nb) | |
258 | { | |
259 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
262 | ||
cce9e06d HX |
263 | static int __init crypto_algapi_init(void) |
264 | { | |
265 | crypto_init_proc(); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static void __exit crypto_algapi_exit(void) | |
270 | { | |
271 | crypto_exit_proc(); | |
272 | } | |
273 | ||
274 | module_init(crypto_algapi_init); | |
275 | module_exit(crypto_algapi_exit); | |
276 | ||
277 | MODULE_LICENSE("GPL"); | |
278 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |