blob: acea250677c0285266adbd877710c2e5873bd26f [file] [log] [blame]
Herbert Xucce9e062006-08-21 21:08:13 +10001/*
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>
Herbert Xu4cc77202006-08-06 21:16:34 +100016#include <linux/list.h>
Herbert Xucce9e062006-08-21 21:08:13 +100017#include <linux/module.h>
18#include <linux/string.h>
19
20#include "internal.h"
21
Herbert Xu4cc77202006-08-06 21:16:34 +100022static LIST_HEAD(crypto_template_list);
23
Herbert Xu492e2b62006-09-21 11:35:17 +100024void crypto_larval_error(const char *name, u32 type, u32 mask)
Herbert Xu28259822006-08-06 21:23:26 +100025{
26 struct crypto_alg *alg;
27
28 down_read(&crypto_alg_sem);
Herbert Xu492e2b62006-09-21 11:35:17 +100029 alg = __crypto_alg_lookup(name, type, mask);
Herbert Xu28259822006-08-06 21:23:26 +100030 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}
40EXPORT_SYMBOL_GPL(crypto_larval_error);
41
Herbert Xucce9e062006-08-21 21:08:13 +100042static 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
Herbert Xu4cc77202006-08-06 21:16:34 +100059static int crypto_check_alg(struct crypto_alg *alg)
Herbert Xucce9e062006-08-21 21:08:13 +100060{
Herbert Xucce9e062006-08-21 21:08:13 +100061 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;
Herbert Xucce9e062006-08-21 21:08:13 +100072
Herbert Xu4cc77202006-08-06 21:16:34 +100073 return crypto_set_driver_name(alg);
74}
75
76static int __crypto_register_alg(struct crypto_alg *alg)
77{
78 struct crypto_alg *q;
79 int ret = -EEXIST;
80
Herbert Xu28259822006-08-06 21:23:26 +100081 atomic_set(&alg->cra_refcnt, 1);
Herbert Xucce9e062006-08-21 21:08:13 +100082 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xu4cc77202006-08-06 21:16:34 +100083 if (q == alg)
Herbert Xucce9e062006-08-21 21:08:13 +100084 goto out;
Herbert Xu28259822006-08-06 21:23:26 +100085 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
Herbert Xu492e2b62006-09-21 11:35:17 +100090 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
91 continue;
Herbert Xu28259822006-08-06 21:23:26 +100092 if (!crypto_mod_get(alg))
93 continue;
94 larval->adult = alg;
95 complete(&larval->completion);
96 }
Herbert Xucce9e062006-08-21 21:08:13 +100097 }
98
99 list_add(&alg->cra_list, &crypto_alg_list);
Herbert Xu28259822006-08-06 21:23:26 +1000100
101 crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000102 ret = 0;
Herbert Xu28259822006-08-06 21:23:26 +1000103
Herbert Xucce9e062006-08-21 21:08:13 +1000104out:
Herbert Xucce9e062006-08-21 21:08:13 +1000105 return ret;
106}
Herbert Xu4cc77202006-08-06 21:16:34 +1000107
108int 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}
Herbert Xucce9e062006-08-21 21:08:13 +1000122EXPORT_SYMBOL_GPL(crypto_register_alg);
123
124int crypto_unregister_alg(struct crypto_alg *alg)
125{
126 int ret = -ENOENT;
Herbert Xucce9e062006-08-21 21:08:13 +1000127
128 down_write(&crypto_alg_sem);
Herbert Xu4cc77202006-08-06 21:16:34 +1000129 if (likely(!list_empty(&alg->cra_list))) {
130 list_del_init(&alg->cra_list);
131 ret = 0;
Herbert Xucce9e062006-08-21 21:08:13 +1000132 }
Herbert Xu28259822006-08-06 21:23:26 +1000133 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
Herbert Xucce9e062006-08-21 21:08:13 +1000134 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}
145EXPORT_SYMBOL_GPL(crypto_unregister_alg);
146
Herbert Xu4cc77202006-08-06 21:16:34 +1000147int 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);
Herbert Xu28259822006-08-06 21:23:26 +1000160 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
Herbert Xu4cc77202006-08-06 21:16:34 +1000161 err = 0;
162out:
163 up_write(&crypto_alg_sem);
164 return err;
165}
166EXPORT_SYMBOL_GPL(crypto_register_template);
167
168void 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);
Herbert Xu28259822006-08-06 21:23:26 +1000183 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000184 }
185
Herbert Xu28259822006-08-06 21:23:26 +1000186 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
187
Herbert Xu4cc77202006-08-06 21:16:34 +1000188 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}
195EXPORT_SYMBOL_GPL(crypto_unregister_template);
196
197static 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
216struct crypto_template *crypto_lookup_template(const char *name)
217{
218 return try_then_request_module(__crypto_lookup_template(name), name);
219}
220EXPORT_SYMBOL_GPL(crypto_lookup_template);
221
222int 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
245unlock:
246 up_write(&crypto_alg_sem);
247
248err:
249 return err;
250}
251EXPORT_SYMBOL_GPL(crypto_register_instance);
252
Herbert Xu28259822006-08-06 21:23:26 +1000253int crypto_register_notifier(struct notifier_block *nb)
254{
255 return blocking_notifier_chain_register(&crypto_chain, nb);
256}
257EXPORT_SYMBOL_GPL(crypto_register_notifier);
258
259int crypto_unregister_notifier(struct notifier_block *nb)
260{
261 return blocking_notifier_chain_unregister(&crypto_chain, nb);
262}
263EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
264
Herbert Xucce9e062006-08-21 21:08:13 +1000265static int __init crypto_algapi_init(void)
266{
267 crypto_init_proc();
268 return 0;
269}
270
271static void __exit crypto_algapi_exit(void)
272{
273 crypto_exit_proc();
274}
275
276module_init(crypto_algapi_init);
277module_exit(crypto_algapi_exit);
278
279MODULE_LICENSE("GPL");
280MODULE_DESCRIPTION("Cryptographic algorithms API");