2 * Cryptographic API for algorithms (i.e., low-level API).
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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)
13 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/string.h>
22 static LIST_HEAD(crypto_template_list
);
24 void crypto_larval_error(const char *name
, u32 type
, u32 mask
)
26 struct crypto_alg
*alg
;
28 down_read(&crypto_alg_sem
);
29 alg
= __crypto_alg_lookup(name
, type
, mask
);
30 up_read(&crypto_alg_sem
);
33 if (crypto_is_larval(alg
)) {
34 struct crypto_larval
*larval
= (void *)alg
;
35 complete(&larval
->completion
);
40 EXPORT_SYMBOL_GPL(crypto_larval_error
);
42 static inline int crypto_set_driver_name(struct crypto_alg
*alg
)
44 static const char suffix
[] = "-generic";
45 char *driver_name
= alg
->cra_driver_name
;
51 len
= strlcpy(driver_name
, alg
->cra_name
, CRYPTO_MAX_ALG_NAME
);
52 if (len
+ sizeof(suffix
) > CRYPTO_MAX_ALG_NAME
)
55 memcpy(driver_name
+ len
, suffix
, sizeof(suffix
));
59 static int crypto_check_alg(struct crypto_alg
*alg
)
61 if (alg
->cra_alignmask
& (alg
->cra_alignmask
+ 1))
64 if (alg
->cra_alignmask
& alg
->cra_blocksize
)
67 if (alg
->cra_blocksize
> PAGE_SIZE
/ 8)
70 if (alg
->cra_priority
< 0)
73 return crypto_set_driver_name(alg
);
76 static int __crypto_register_alg(struct crypto_alg
*alg
)
81 atomic_set(&alg
->cra_refcnt
, 1);
82 list_for_each_entry(q
, &crypto_alg_list
, cra_list
) {
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
;
90 if ((q
->cra_flags
^ alg
->cra_flags
) & larval
->mask
)
92 if (!crypto_mod_get(alg
))
95 complete(&larval
->completion
);
99 list_add(&alg
->cra_list
, &crypto_alg_list
);
101 crypto_notify(CRYPTO_MSG_ALG_REGISTER
, alg
);
108 int crypto_register_alg(struct crypto_alg
*alg
)
112 err
= crypto_check_alg(alg
);
116 down_write(&crypto_alg_sem
);
117 err
= __crypto_register_alg(alg
);
118 up_write(&crypto_alg_sem
);
122 EXPORT_SYMBOL_GPL(crypto_register_alg
);
124 int crypto_unregister_alg(struct crypto_alg
*alg
)
128 down_write(&crypto_alg_sem
);
129 if (likely(!list_empty(&alg
->cra_list
))) {
130 list_del_init(&alg
->cra_list
);
133 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER
, alg
);
134 up_write(&crypto_alg_sem
);
139 BUG_ON(atomic_read(&alg
->cra_refcnt
) != 1);
140 if (alg
->cra_destroy
)
141 alg
->cra_destroy(alg
);
145 EXPORT_SYMBOL_GPL(crypto_unregister_alg
);
147 int crypto_register_template(struct crypto_template
*tmpl
)
149 struct crypto_template
*q
;
152 down_write(&crypto_alg_sem
);
154 list_for_each_entry(q
, &crypto_template_list
, list
) {
159 list_add(&tmpl
->list
, &crypto_template_list
);
160 crypto_notify(CRYPTO_MSG_TMPL_REGISTER
, tmpl
);
163 up_write(&crypto_alg_sem
);
166 EXPORT_SYMBOL_GPL(crypto_register_template
);
168 void crypto_unregister_template(struct crypto_template
*tmpl
)
170 struct crypto_instance
*inst
;
171 struct hlist_node
*p
, *n
;
172 struct hlist_head
*list
;
174 down_write(&crypto_alg_sem
);
176 BUG_ON(list_empty(&tmpl
->list
));
177 list_del_init(&tmpl
->list
);
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
);
183 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER
, &inst
->alg
);
186 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER
, tmpl
);
188 up_write(&crypto_alg_sem
);
190 hlist_for_each_entry_safe(inst
, p
, n
, list
, list
) {
191 BUG_ON(atomic_read(&inst
->alg
.cra_refcnt
) != 1);
195 EXPORT_SYMBOL_GPL(crypto_unregister_template
);
197 static struct crypto_template
*__crypto_lookup_template(const char *name
)
199 struct crypto_template
*q
, *tmpl
= NULL
;
201 down_read(&crypto_alg_sem
);
202 list_for_each_entry(q
, &crypto_template_list
, list
) {
203 if (strcmp(q
->name
, name
))
205 if (unlikely(!crypto_tmpl_get(q
)))
211 up_read(&crypto_alg_sem
);
216 struct crypto_template
*crypto_lookup_template(const char *name
)
218 return try_then_request_module(__crypto_lookup_template(name
), name
);
220 EXPORT_SYMBOL_GPL(crypto_lookup_template
);
222 int crypto_register_instance(struct crypto_template
*tmpl
,
223 struct crypto_instance
*inst
)
227 if (inst
->alg
.cra_destroy
)
230 err
= crypto_check_alg(&inst
->alg
);
234 inst
->alg
.cra_module
= tmpl
->module
;
236 down_write(&crypto_alg_sem
);
238 err
= __crypto_register_alg(&inst
->alg
);
242 hlist_add_head(&inst
->list
, &tmpl
->instances
);
246 up_write(&crypto_alg_sem
);
251 EXPORT_SYMBOL_GPL(crypto_register_instance
);
253 int crypto_register_notifier(struct notifier_block
*nb
)
255 return blocking_notifier_chain_register(&crypto_chain
, nb
);
257 EXPORT_SYMBOL_GPL(crypto_register_notifier
);
259 int crypto_unregister_notifier(struct notifier_block
*nb
)
261 return blocking_notifier_chain_unregister(&crypto_chain
, nb
);
263 EXPORT_SYMBOL_GPL(crypto_unregister_notifier
);
265 static int __init
crypto_algapi_init(void)
271 static void __exit
crypto_algapi_exit(void)
276 module_init(crypto_algapi_init
);
277 module_exit(crypto_algapi_exit
);
279 MODULE_LICENSE("GPL");
280 MODULE_DESCRIPTION("Cryptographic algorithms API");