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/err.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <linux/list.h>
18 #include <linux/module.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/string.h>
24 static LIST_HEAD(crypto_template_list
);
26 void crypto_larval_error(const char *name
, u32 type
, u32 mask
)
28 struct crypto_alg
*alg
;
30 alg
= crypto_alg_lookup(name
, type
, mask
);
33 if (crypto_is_larval(alg
)) {
34 struct crypto_larval
*larval
= (void *)alg
;
35 complete_all(&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_blocksize
> PAGE_SIZE
/ 8)
67 if (alg
->cra_priority
< 0)
70 return crypto_set_driver_name(alg
);
73 static void crypto_destroy_instance(struct crypto_alg
*alg
)
75 struct crypto_instance
*inst
= (void *)alg
;
76 struct crypto_template
*tmpl
= inst
->tmpl
;
79 crypto_tmpl_put(tmpl
);
82 static void crypto_remove_spawn(struct crypto_spawn
*spawn
,
83 struct list_head
*list
,
84 struct list_head
*secondary_spawns
)
86 struct crypto_instance
*inst
= spawn
->inst
;
87 struct crypto_template
*tmpl
= inst
->tmpl
;
89 list_del_init(&spawn
->list
);
92 if (crypto_is_dead(&inst
->alg
))
95 inst
->alg
.cra_flags
|= CRYPTO_ALG_DEAD
;
96 if (hlist_unhashed(&inst
->list
))
99 if (!tmpl
|| !crypto_tmpl_get(tmpl
))
102 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER
, &inst
->alg
);
103 list_move(&inst
->alg
.cra_list
, list
);
104 hlist_del(&inst
->list
);
105 inst
->alg
.cra_destroy
= crypto_destroy_instance
;
107 list_splice(&inst
->alg
.cra_users
, secondary_spawns
);
110 static void crypto_remove_spawns(struct list_head
*spawns
,
111 struct list_head
*list
, u32 new_type
)
113 struct crypto_spawn
*spawn
, *n
;
114 LIST_HEAD(secondary_spawns
);
116 list_for_each_entry_safe(spawn
, n
, spawns
, list
) {
117 if ((spawn
->alg
->cra_flags
^ new_type
) & spawn
->mask
)
120 crypto_remove_spawn(spawn
, list
, &secondary_spawns
);
123 while (!list_empty(&secondary_spawns
)) {
124 list_for_each_entry_safe(spawn
, n
, &secondary_spawns
, list
)
125 crypto_remove_spawn(spawn
, list
, &secondary_spawns
);
129 static int __crypto_register_alg(struct crypto_alg
*alg
,
130 struct list_head
*list
)
132 struct crypto_alg
*q
;
135 if (crypto_is_dead(alg
))
138 INIT_LIST_HEAD(&alg
->cra_users
);
142 atomic_set(&alg
->cra_refcnt
, 1);
143 list_for_each_entry(q
, &crypto_alg_list
, cra_list
) {
147 if (crypto_is_moribund(q
))
150 if (crypto_is_larval(q
)) {
151 struct crypto_larval
*larval
= (void *)q
;
154 * Check to see if either our generic name or
155 * specific name can satisfy the name requested
156 * by the larval entry q.
158 if (strcmp(alg
->cra_name
, q
->cra_name
) &&
159 strcmp(alg
->cra_driver_name
, q
->cra_name
))
164 if ((q
->cra_flags
^ alg
->cra_flags
) & larval
->mask
)
166 if (!crypto_mod_get(alg
))
170 complete_all(&larval
->completion
);
174 if (strcmp(alg
->cra_name
, q
->cra_name
))
177 if (strcmp(alg
->cra_driver_name
, q
->cra_driver_name
) &&
178 q
->cra_priority
> alg
->cra_priority
)
181 crypto_remove_spawns(&q
->cra_users
, list
, alg
->cra_flags
);
184 list_add(&alg
->cra_list
, &crypto_alg_list
);
186 crypto_notify(CRYPTO_MSG_ALG_REGISTER
, alg
);
193 static void crypto_remove_final(struct list_head
*list
)
195 struct crypto_alg
*alg
;
196 struct crypto_alg
*n
;
198 list_for_each_entry_safe(alg
, n
, list
, cra_list
) {
199 list_del_init(&alg
->cra_list
);
204 int crypto_register_alg(struct crypto_alg
*alg
)
209 err
= crypto_check_alg(alg
);
213 down_write(&crypto_alg_sem
);
214 err
= __crypto_register_alg(alg
, &list
);
215 up_write(&crypto_alg_sem
);
217 crypto_remove_final(&list
);
220 EXPORT_SYMBOL_GPL(crypto_register_alg
);
222 static int crypto_remove_alg(struct crypto_alg
*alg
, struct list_head
*list
)
224 if (unlikely(list_empty(&alg
->cra_list
)))
227 alg
->cra_flags
|= CRYPTO_ALG_DEAD
;
229 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER
, alg
);
230 list_del_init(&alg
->cra_list
);
231 crypto_remove_spawns(&alg
->cra_users
, list
, alg
->cra_flags
);
236 int crypto_unregister_alg(struct crypto_alg
*alg
)
241 down_write(&crypto_alg_sem
);
242 ret
= crypto_remove_alg(alg
, &list
);
243 up_write(&crypto_alg_sem
);
248 BUG_ON(atomic_read(&alg
->cra_refcnt
) != 1);
249 if (alg
->cra_destroy
)
250 alg
->cra_destroy(alg
);
252 crypto_remove_final(&list
);
255 EXPORT_SYMBOL_GPL(crypto_unregister_alg
);
257 int crypto_register_template(struct crypto_template
*tmpl
)
259 struct crypto_template
*q
;
262 down_write(&crypto_alg_sem
);
264 list_for_each_entry(q
, &crypto_template_list
, list
) {
269 list_add(&tmpl
->list
, &crypto_template_list
);
270 crypto_notify(CRYPTO_MSG_TMPL_REGISTER
, tmpl
);
273 up_write(&crypto_alg_sem
);
276 EXPORT_SYMBOL_GPL(crypto_register_template
);
278 void crypto_unregister_template(struct crypto_template
*tmpl
)
280 struct crypto_instance
*inst
;
281 struct hlist_node
*p
, *n
;
282 struct hlist_head
*list
;
285 down_write(&crypto_alg_sem
);
287 BUG_ON(list_empty(&tmpl
->list
));
288 list_del_init(&tmpl
->list
);
290 list
= &tmpl
->instances
;
291 hlist_for_each_entry(inst
, p
, list
, list
) {
292 int err
= crypto_remove_alg(&inst
->alg
, &users
);
296 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER
, tmpl
);
298 up_write(&crypto_alg_sem
);
300 hlist_for_each_entry_safe(inst
, p
, n
, list
, list
) {
301 BUG_ON(atomic_read(&inst
->alg
.cra_refcnt
) != 1);
304 crypto_remove_final(&users
);
306 EXPORT_SYMBOL_GPL(crypto_unregister_template
);
308 static struct crypto_template
*__crypto_lookup_template(const char *name
)
310 struct crypto_template
*q
, *tmpl
= NULL
;
312 down_read(&crypto_alg_sem
);
313 list_for_each_entry(q
, &crypto_template_list
, list
) {
314 if (strcmp(q
->name
, name
))
316 if (unlikely(!crypto_tmpl_get(q
)))
322 up_read(&crypto_alg_sem
);
327 struct crypto_template
*crypto_lookup_template(const char *name
)
329 return try_then_request_module(__crypto_lookup_template(name
), name
);
331 EXPORT_SYMBOL_GPL(crypto_lookup_template
);
333 int crypto_register_instance(struct crypto_template
*tmpl
,
334 struct crypto_instance
*inst
)
339 err
= crypto_check_alg(&inst
->alg
);
343 inst
->alg
.cra_module
= tmpl
->module
;
345 down_write(&crypto_alg_sem
);
347 err
= __crypto_register_alg(&inst
->alg
, &list
);
351 hlist_add_head(&inst
->list
, &tmpl
->instances
);
355 up_write(&crypto_alg_sem
);
357 crypto_remove_final(&list
);
362 EXPORT_SYMBOL_GPL(crypto_register_instance
);
364 int crypto_init_spawn(struct crypto_spawn
*spawn
, struct crypto_alg
*alg
,
365 struct crypto_instance
*inst
, u32 mask
)
372 down_write(&crypto_alg_sem
);
373 if (!crypto_is_moribund(alg
)) {
374 list_add(&spawn
->list
, &alg
->cra_users
);
378 up_write(&crypto_alg_sem
);
382 EXPORT_SYMBOL_GPL(crypto_init_spawn
);
384 void crypto_drop_spawn(struct crypto_spawn
*spawn
)
386 down_write(&crypto_alg_sem
);
387 list_del(&spawn
->list
);
388 up_write(&crypto_alg_sem
);
390 EXPORT_SYMBOL_GPL(crypto_drop_spawn
);
392 struct crypto_tfm
*crypto_spawn_tfm(struct crypto_spawn
*spawn
, u32 type
,
395 struct crypto_alg
*alg
;
396 struct crypto_alg
*alg2
;
397 struct crypto_tfm
*tfm
;
399 down_read(&crypto_alg_sem
);
403 alg2
= crypto_mod_get(alg2
);
404 up_read(&crypto_alg_sem
);
408 crypto_shoot_alg(alg
);
409 return ERR_PTR(-EAGAIN
);
412 tfm
= ERR_PTR(-EINVAL
);
413 if (unlikely((alg
->cra_flags
^ type
) & mask
))
416 tfm
= __crypto_alloc_tfm(alg
, type
, mask
);
426 EXPORT_SYMBOL_GPL(crypto_spawn_tfm
);
428 int crypto_register_notifier(struct notifier_block
*nb
)
430 return blocking_notifier_chain_register(&crypto_chain
, nb
);
432 EXPORT_SYMBOL_GPL(crypto_register_notifier
);
434 int crypto_unregister_notifier(struct notifier_block
*nb
)
436 return blocking_notifier_chain_unregister(&crypto_chain
, nb
);
438 EXPORT_SYMBOL_GPL(crypto_unregister_notifier
);
440 struct crypto_attr_type
*crypto_get_attr_type(struct rtattr
**tb
)
442 struct rtattr
*rta
= tb
[0];
443 struct crypto_attr_type
*algt
;
446 return ERR_PTR(-ENOENT
);
447 if (RTA_PAYLOAD(rta
) < sizeof(*algt
))
448 return ERR_PTR(-EINVAL
);
449 if (rta
->rta_type
!= CRYPTOA_TYPE
)
450 return ERR_PTR(-EINVAL
);
452 algt
= RTA_DATA(rta
);
456 EXPORT_SYMBOL_GPL(crypto_get_attr_type
);
458 int crypto_check_attr_type(struct rtattr
**tb
, u32 type
)
460 struct crypto_attr_type
*algt
;
462 algt
= crypto_get_attr_type(tb
);
464 return PTR_ERR(algt
);
466 if ((algt
->type
^ type
) & algt
->mask
)
471 EXPORT_SYMBOL_GPL(crypto_check_attr_type
);
473 const char *crypto_attr_alg_name(struct rtattr
*rta
)
475 struct crypto_attr_alg
*alga
;
478 return ERR_PTR(-ENOENT
);
479 if (RTA_PAYLOAD(rta
) < sizeof(*alga
))
480 return ERR_PTR(-EINVAL
);
481 if (rta
->rta_type
!= CRYPTOA_ALG
)
482 return ERR_PTR(-EINVAL
);
484 alga
= RTA_DATA(rta
);
485 alga
->name
[CRYPTO_MAX_ALG_NAME
- 1] = 0;
489 EXPORT_SYMBOL_GPL(crypto_attr_alg_name
);
491 struct crypto_alg
*crypto_attr_alg(struct rtattr
*rta
, u32 type
, u32 mask
)
496 name
= crypto_attr_alg_name(rta
);
501 return crypto_alg_mod_lookup(name
, type
, mask
);
503 EXPORT_SYMBOL_GPL(crypto_attr_alg
);
505 int crypto_attr_u32(struct rtattr
*rta
, u32
*num
)
507 struct crypto_attr_u32
*nu32
;
511 if (RTA_PAYLOAD(rta
) < sizeof(*nu32
))
513 if (rta
->rta_type
!= CRYPTOA_U32
)
516 nu32
= RTA_DATA(rta
);
521 EXPORT_SYMBOL_GPL(crypto_attr_u32
);
523 struct crypto_instance
*crypto_alloc_instance(const char *name
,
524 struct crypto_alg
*alg
)
526 struct crypto_instance
*inst
;
527 struct crypto_spawn
*spawn
;
530 inst
= kzalloc(sizeof(*inst
) + sizeof(*spawn
), GFP_KERNEL
);
532 return ERR_PTR(-ENOMEM
);
535 if (snprintf(inst
->alg
.cra_name
, CRYPTO_MAX_ALG_NAME
, "%s(%s)", name
,
536 alg
->cra_name
) >= CRYPTO_MAX_ALG_NAME
)
539 if (snprintf(inst
->alg
.cra_driver_name
, CRYPTO_MAX_ALG_NAME
, "%s(%s)",
540 name
, alg
->cra_driver_name
) >= CRYPTO_MAX_ALG_NAME
)
543 spawn
= crypto_instance_ctx(inst
);
544 err
= crypto_init_spawn(spawn
, alg
, inst
,
545 CRYPTO_ALG_TYPE_MASK
| CRYPTO_ALG_ASYNC
);
556 EXPORT_SYMBOL_GPL(crypto_alloc_instance
);
558 void crypto_init_queue(struct crypto_queue
*queue
, unsigned int max_qlen
)
560 INIT_LIST_HEAD(&queue
->list
);
561 queue
->backlog
= &queue
->list
;
563 queue
->max_qlen
= max_qlen
;
565 EXPORT_SYMBOL_GPL(crypto_init_queue
);
567 int crypto_enqueue_request(struct crypto_queue
*queue
,
568 struct crypto_async_request
*request
)
570 int err
= -EINPROGRESS
;
572 if (unlikely(queue
->qlen
>= queue
->max_qlen
)) {
574 if (!(request
->flags
& CRYPTO_TFM_REQ_MAY_BACKLOG
))
576 if (queue
->backlog
== &queue
->list
)
577 queue
->backlog
= &request
->list
;
581 list_add_tail(&request
->list
, &queue
->list
);
586 EXPORT_SYMBOL_GPL(crypto_enqueue_request
);
588 struct crypto_async_request
*crypto_dequeue_request(struct crypto_queue
*queue
)
590 struct list_head
*request
;
592 if (unlikely(!queue
->qlen
))
597 if (queue
->backlog
!= &queue
->list
)
598 queue
->backlog
= queue
->backlog
->next
;
600 request
= queue
->list
.next
;
603 return list_entry(request
, struct crypto_async_request
, list
);
605 EXPORT_SYMBOL_GPL(crypto_dequeue_request
);
607 int crypto_tfm_in_queue(struct crypto_queue
*queue
, struct crypto_tfm
*tfm
)
609 struct crypto_async_request
*req
;
611 list_for_each_entry(req
, &queue
->list
, list
) {
618 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue
);
620 static inline void crypto_inc_byte(u8
*a
, unsigned int size
)
625 for (; size
; size
--) {
633 void crypto_inc(u8
*a
, unsigned int size
)
635 __be32
*b
= (__be32
*)(a
+ size
);
638 for (; size
>= 4; size
-= 4) {
639 c
= be32_to_cpu(*--b
) + 1;
645 crypto_inc_byte(a
, size
);
647 EXPORT_SYMBOL_GPL(crypto_inc
);
649 static inline void crypto_xor_byte(u8
*a
, const u8
*b
, unsigned int size
)
655 void crypto_xor(u8
*dst
, const u8
*src
, unsigned int size
)
660 for (; size
>= 4; size
-= 4)
663 crypto_xor_byte((u8
*)a
, (u8
*)b
, size
);
665 EXPORT_SYMBOL_GPL(crypto_xor
);
667 static int __init
crypto_algapi_init(void)
673 static void __exit
crypto_algapi_exit(void)
678 module_init(crypto_algapi_init
);
679 module_exit(crypto_algapi_exit
);
681 MODULE_LICENSE("GPL");
682 MODULE_DESCRIPTION("Cryptographic algorithms API");