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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 | ||
492e2b63 | 24 | void crypto_larval_error(const char *name, u32 type, u32 mask) |
2825982d HX |
25 | { |
26 | struct crypto_alg *alg; | |
27 | ||
28 | down_read(&crypto_alg_sem); | |
492e2b63 | 29 | alg = __crypto_alg_lookup(name, type, mask); |
2825982d HX |
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 | ||
492e2b63 HX |
90 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
91 | continue; | |
2825982d HX |
92 | if (!crypto_mod_get(alg)) |
93 | continue; | |
94 | larval->adult = alg; | |
95 | complete(&larval->completion); | |
96 | } | |
cce9e06d HX |
97 | } |
98 | ||
99 | list_add(&alg->cra_list, &crypto_alg_list); | |
2825982d HX |
100 | |
101 | crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg); | |
4cc7720c | 102 | ret = 0; |
2825982d | 103 | |
cce9e06d | 104 | out: |
cce9e06d HX |
105 | return ret; |
106 | } | |
4cc7720c HX |
107 | |
108 | int crypto_register_alg(struct crypto_alg *alg) | |
109 | { | |
110 | int err; | |
111 | ||
112 | err = crypto_check_alg(alg); | |
113 | if (err) | |
114 | return err; | |
115 | ||
116 | down_write(&crypto_alg_sem); | |
117 | err = __crypto_register_alg(alg); | |
118 | up_write(&crypto_alg_sem); | |
119 | ||
120 | return err; | |
121 | } | |
cce9e06d HX |
122 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
123 | ||
124 | int crypto_unregister_alg(struct crypto_alg *alg) | |
125 | { | |
126 | int ret = -ENOENT; | |
cce9e06d HX |
127 | |
128 | down_write(&crypto_alg_sem); | |
4cc7720c HX |
129 | if (likely(!list_empty(&alg->cra_list))) { |
130 | list_del_init(&alg->cra_list); | |
131 | ret = 0; | |
cce9e06d | 132 | } |
2825982d | 133 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); |
cce9e06d HX |
134 | up_write(&crypto_alg_sem); |
135 | ||
136 | if (ret) | |
137 | return ret; | |
138 | ||
139 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
140 | if (alg->cra_destroy) | |
141 | alg->cra_destroy(alg); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
146 | ||
4cc7720c HX |
147 | int crypto_register_template(struct crypto_template *tmpl) |
148 | { | |
149 | struct crypto_template *q; | |
150 | int err = -EEXIST; | |
151 | ||
152 | down_write(&crypto_alg_sem); | |
153 | ||
154 | list_for_each_entry(q, &crypto_template_list, list) { | |
155 | if (q == tmpl) | |
156 | goto out; | |
157 | } | |
158 | ||
159 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 160 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
161 | err = 0; |
162 | out: | |
163 | up_write(&crypto_alg_sem); | |
164 | return err; | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
167 | ||
168 | void crypto_unregister_template(struct crypto_template *tmpl) | |
169 | { | |
170 | struct crypto_instance *inst; | |
171 | struct hlist_node *p, *n; | |
172 | struct hlist_head *list; | |
173 | ||
174 | down_write(&crypto_alg_sem); | |
175 | ||
176 | BUG_ON(list_empty(&tmpl->list)); | |
177 | list_del_init(&tmpl->list); | |
178 | ||
179 | list = &tmpl->instances; | |
180 | hlist_for_each_entry(inst, p, list, list) { | |
181 | BUG_ON(list_empty(&inst->alg.cra_list)); | |
182 | list_del_init(&inst->alg.cra_list); | |
2825982d | 183 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); |
4cc7720c HX |
184 | } |
185 | ||
2825982d HX |
186 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
187 | ||
4cc7720c HX |
188 | up_write(&crypto_alg_sem); |
189 | ||
190 | hlist_for_each_entry_safe(inst, p, n, list, list) { | |
191 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); | |
192 | tmpl->free(inst); | |
193 | } | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
196 | ||
197 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
198 | { | |
199 | struct crypto_template *q, *tmpl = NULL; | |
200 | ||
201 | down_read(&crypto_alg_sem); | |
202 | list_for_each_entry(q, &crypto_template_list, list) { | |
203 | if (strcmp(q->name, name)) | |
204 | continue; | |
205 | if (unlikely(!crypto_tmpl_get(q))) | |
206 | continue; | |
207 | ||
208 | tmpl = q; | |
209 | break; | |
210 | } | |
211 | up_read(&crypto_alg_sem); | |
212 | ||
213 | return tmpl; | |
214 | } | |
215 | ||
216 | struct crypto_template *crypto_lookup_template(const char *name) | |
217 | { | |
218 | return try_then_request_module(__crypto_lookup_template(name), name); | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
221 | ||
222 | int crypto_register_instance(struct crypto_template *tmpl, | |
223 | struct crypto_instance *inst) | |
224 | { | |
225 | int err = -EINVAL; | |
226 | ||
227 | if (inst->alg.cra_destroy) | |
228 | goto err; | |
229 | ||
230 | err = crypto_check_alg(&inst->alg); | |
231 | if (err) | |
232 | goto err; | |
233 | ||
234 | inst->alg.cra_module = tmpl->module; | |
235 | ||
236 | down_write(&crypto_alg_sem); | |
237 | ||
238 | err = __crypto_register_alg(&inst->alg); | |
239 | if (err) | |
240 | goto unlock; | |
241 | ||
242 | hlist_add_head(&inst->list, &tmpl->instances); | |
243 | inst->tmpl = tmpl; | |
244 | ||
245 | unlock: | |
246 | up_write(&crypto_alg_sem); | |
247 | ||
248 | err: | |
249 | return err; | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
252 | ||
2825982d HX |
253 | int crypto_register_notifier(struct notifier_block *nb) |
254 | { | |
255 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
256 | } | |
257 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
258 | ||
259 | int crypto_unregister_notifier(struct notifier_block *nb) | |
260 | { | |
261 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
262 | } | |
263 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
264 | ||
cce9e06d HX |
265 | static int __init crypto_algapi_init(void) |
266 | { | |
267 | crypto_init_proc(); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static void __exit crypto_algapi_exit(void) | |
272 | { | |
273 | crypto_exit_proc(); | |
274 | } | |
275 | ||
276 | module_init(crypto_algapi_init); | |
277 | module_exit(crypto_algapi_exit); | |
278 | ||
279 | MODULE_LICENSE("GPL"); | |
280 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |