spi: au1550_spi full duplex dma fix
[linux-2.6.git] / crypto / algapi.c
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/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>
21
22 #include "internal.h"
23
24 static void crypto_remove_final(struct list_head *list);
25
26 static LIST_HEAD(crypto_template_list);
27
28 void crypto_larval_error(const char *name, u32 type, u32 mask)
29 {
30         struct crypto_alg *alg;
31
32         alg = crypto_alg_lookup(name, type, mask);
33
34         if (alg) {
35                 if (crypto_is_larval(alg)) {
36                         struct crypto_larval *larval = (void *)alg;
37                         complete_all(&larval->completion);
38                 }
39                 crypto_mod_put(alg);
40         }
41 }
42 EXPORT_SYMBOL_GPL(crypto_larval_error);
43
44 static inline int crypto_set_driver_name(struct crypto_alg *alg)
45 {
46         static const char suffix[] = "-generic";
47         char *driver_name = alg->cra_driver_name;
48         int len;
49
50         if (*driver_name)
51                 return 0;
52
53         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
54         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
55                 return -ENAMETOOLONG;
56
57         memcpy(driver_name + len, suffix, sizeof(suffix));
58         return 0;
59 }
60
61 static int crypto_check_alg(struct crypto_alg *alg)
62 {
63         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
64                 return -EINVAL;
65
66         if (alg->cra_blocksize > PAGE_SIZE / 8)
67                 return -EINVAL;
68
69         if (alg->cra_priority < 0)
70                 return -EINVAL;
71
72         return crypto_set_driver_name(alg);
73 }
74
75 static void crypto_destroy_instance(struct crypto_alg *alg)
76 {
77         struct crypto_instance *inst = (void *)alg;
78         struct crypto_template *tmpl = inst->tmpl;
79
80         tmpl->free(inst);
81         crypto_tmpl_put(tmpl);
82 }
83
84 static void crypto_remove_spawn(struct crypto_spawn *spawn,
85                                 struct list_head *list,
86                                 struct list_head *secondary_spawns)
87 {
88         struct crypto_instance *inst = spawn->inst;
89         struct crypto_template *tmpl = inst->tmpl;
90
91         list_del_init(&spawn->list);
92         spawn->alg = NULL;
93
94         if (crypto_is_dead(&inst->alg))
95                 return;
96
97         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
98         if (hlist_unhashed(&inst->list))
99                 return;
100
101         if (!tmpl || !crypto_tmpl_get(tmpl))
102                 return;
103
104         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
105         list_move(&inst->alg.cra_list, list);
106         hlist_del(&inst->list);
107         inst->alg.cra_destroy = crypto_destroy_instance;
108
109         list_splice(&inst->alg.cra_users, secondary_spawns);
110 }
111
112 static void crypto_remove_spawns(struct list_head *spawns,
113                                  struct list_head *list, u32 new_type)
114 {
115         struct crypto_spawn *spawn, *n;
116         LIST_HEAD(secondary_spawns);
117
118         list_for_each_entry_safe(spawn, n, spawns, list) {
119                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
120                         continue;
121
122                 crypto_remove_spawn(spawn, list, &secondary_spawns);
123         }
124
125         while (!list_empty(&secondary_spawns)) {
126                 list_for_each_entry_safe(spawn, n, &secondary_spawns, list)
127                         crypto_remove_spawn(spawn, list, &secondary_spawns);
128         }
129 }
130
131 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
132 {
133         struct crypto_alg *q;
134         struct crypto_larval *larval;
135         int ret = -EAGAIN;
136
137         if (crypto_is_dead(alg))
138                 goto err;
139
140         INIT_LIST_HEAD(&alg->cra_users);
141
142         /* No cheating! */
143         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
144
145         ret = -EEXIST;
146
147         atomic_set(&alg->cra_refcnt, 1);
148         list_for_each_entry(q, &crypto_alg_list, cra_list) {
149                 if (q == alg)
150                         goto err;
151
152                 if (crypto_is_larval(q)) {
153                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
154                                 goto err;
155                         continue;
156                 }
157
158                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
159                     !strcmp(q->cra_name, alg->cra_driver_name))
160                         goto err;
161         }
162
163         larval = crypto_larval_alloc(alg->cra_name,
164                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
165         if (IS_ERR(larval))
166                 goto out;
167
168         ret = -ENOENT;
169         larval->adult = crypto_mod_get(alg);
170         if (!larval->adult)
171                 goto free_larval;
172
173         atomic_set(&larval->alg.cra_refcnt, 1);
174         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
175                CRYPTO_MAX_ALG_NAME);
176         larval->alg.cra_priority = alg->cra_priority;
177
178         list_add(&alg->cra_list, &crypto_alg_list);
179         list_add(&larval->alg.cra_list, &crypto_alg_list);
180
181 out:    
182         return larval;
183
184 free_larval:
185         kfree(larval);
186 err:
187         larval = ERR_PTR(ret);
188         goto out;
189 }
190
191 void crypto_alg_tested(const char *name, int err)
192 {
193         struct crypto_larval *test;
194         struct crypto_alg *alg;
195         struct crypto_alg *q;
196         LIST_HEAD(list);
197
198         down_write(&crypto_alg_sem);
199         list_for_each_entry(q, &crypto_alg_list, cra_list) {
200                 if (!crypto_is_larval(q))
201                         continue;
202
203                 test = (struct crypto_larval *)q;
204
205                 if (!strcmp(q->cra_driver_name, name))
206                         goto found;
207         }
208
209         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
210         goto unlock;
211
212 found:
213         alg = test->adult;
214         if (err || list_empty(&alg->cra_list))
215                 goto complete;
216
217         alg->cra_flags |= CRYPTO_ALG_TESTED;
218
219         list_for_each_entry(q, &crypto_alg_list, cra_list) {
220                 if (q == alg)
221                         continue;
222
223                 if (crypto_is_moribund(q))
224                         continue;
225
226                 if (crypto_is_larval(q)) {
227                         struct crypto_larval *larval = (void *)q;
228
229                         /*
230                          * Check to see if either our generic name or
231                          * specific name can satisfy the name requested
232                          * by the larval entry q.
233                          */
234                         if (strcmp(alg->cra_name, q->cra_name) &&
235                             strcmp(alg->cra_driver_name, q->cra_name))
236                                 continue;
237
238                         if (larval->adult)
239                                 continue;
240                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
241                                 continue;
242                         if (!crypto_mod_get(alg))
243                                 continue;
244
245                         larval->adult = alg;
246                         complete_all(&larval->completion);
247                         continue;
248                 }
249
250                 if (strcmp(alg->cra_name, q->cra_name))
251                         continue;
252
253                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
254                     q->cra_priority > alg->cra_priority)
255                         continue;
256
257                 crypto_remove_spawns(&q->cra_users, &list, alg->cra_flags);
258         }
259
260 complete:
261         complete_all(&test->completion);
262
263 unlock:
264         up_write(&crypto_alg_sem);
265
266         crypto_remove_final(&list);
267 }
268 EXPORT_SYMBOL_GPL(crypto_alg_tested);
269
270 static void crypto_remove_final(struct list_head *list)
271 {
272         struct crypto_alg *alg;
273         struct crypto_alg *n;
274
275         list_for_each_entry_safe(alg, n, list, cra_list) {
276                 list_del_init(&alg->cra_list);
277                 crypto_alg_put(alg);
278         }
279 }
280
281 static void crypto_wait_for_test(struct crypto_larval *larval)
282 {
283         int err;
284
285         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
286         if (err != NOTIFY_STOP) {
287                 if (WARN_ON(err != NOTIFY_DONE))
288                         goto out;
289                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
290         }
291
292         err = wait_for_completion_interruptible(&larval->completion);
293         WARN_ON(err);
294
295 out:
296         crypto_larval_kill(&larval->alg);
297 }
298
299 int crypto_register_alg(struct crypto_alg *alg)
300 {
301         struct crypto_larval *larval;
302         int err;
303
304         err = crypto_check_alg(alg);
305         if (err)
306                 return err;
307
308         down_write(&crypto_alg_sem);
309         larval = __crypto_register_alg(alg);
310         up_write(&crypto_alg_sem);
311
312         if (IS_ERR(larval))
313                 return PTR_ERR(larval);
314
315         crypto_wait_for_test(larval);
316         return 0;
317 }
318 EXPORT_SYMBOL_GPL(crypto_register_alg);
319
320 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
321 {
322         if (unlikely(list_empty(&alg->cra_list)))
323                 return -ENOENT;
324
325         alg->cra_flags |= CRYPTO_ALG_DEAD;
326
327         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
328         list_del_init(&alg->cra_list);
329         crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags);
330
331         return 0;
332 }
333
334 int crypto_unregister_alg(struct crypto_alg *alg)
335 {
336         int ret;
337         LIST_HEAD(list);
338         
339         down_write(&crypto_alg_sem);
340         ret = crypto_remove_alg(alg, &list);
341         up_write(&crypto_alg_sem);
342
343         if (ret)
344                 return ret;
345
346         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
347         if (alg->cra_destroy)
348                 alg->cra_destroy(alg);
349
350         crypto_remove_final(&list);
351         return 0;
352 }
353 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
354
355 int crypto_register_template(struct crypto_template *tmpl)
356 {
357         struct crypto_template *q;
358         int err = -EEXIST;
359
360         down_write(&crypto_alg_sem);
361
362         list_for_each_entry(q, &crypto_template_list, list) {
363                 if (q == tmpl)
364                         goto out;
365         }
366
367         list_add(&tmpl->list, &crypto_template_list);
368         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
369         err = 0;
370 out:
371         up_write(&crypto_alg_sem);
372         return err;
373 }
374 EXPORT_SYMBOL_GPL(crypto_register_template);
375
376 void crypto_unregister_template(struct crypto_template *tmpl)
377 {
378         struct crypto_instance *inst;
379         struct hlist_node *p, *n;
380         struct hlist_head *list;
381         LIST_HEAD(users);
382
383         down_write(&crypto_alg_sem);
384
385         BUG_ON(list_empty(&tmpl->list));
386         list_del_init(&tmpl->list);
387
388         list = &tmpl->instances;
389         hlist_for_each_entry(inst, p, list, list) {
390                 int err = crypto_remove_alg(&inst->alg, &users);
391                 BUG_ON(err);
392         }
393
394         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
395
396         up_write(&crypto_alg_sem);
397
398         hlist_for_each_entry_safe(inst, p, n, list, list) {
399                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
400                 tmpl->free(inst);
401         }
402         crypto_remove_final(&users);
403 }
404 EXPORT_SYMBOL_GPL(crypto_unregister_template);
405
406 static struct crypto_template *__crypto_lookup_template(const char *name)
407 {
408         struct crypto_template *q, *tmpl = NULL;
409
410         down_read(&crypto_alg_sem);
411         list_for_each_entry(q, &crypto_template_list, list) {
412                 if (strcmp(q->name, name))
413                         continue;
414                 if (unlikely(!crypto_tmpl_get(q)))
415                         continue;
416
417                 tmpl = q;
418                 break;
419         }
420         up_read(&crypto_alg_sem);
421
422         return tmpl;
423 }
424
425 struct crypto_template *crypto_lookup_template(const char *name)
426 {
427         return try_then_request_module(__crypto_lookup_template(name), name);
428 }
429 EXPORT_SYMBOL_GPL(crypto_lookup_template);
430
431 int crypto_register_instance(struct crypto_template *tmpl,
432                              struct crypto_instance *inst)
433 {
434         struct crypto_larval *larval;
435         int err;
436
437         err = crypto_check_alg(&inst->alg);
438         if (err)
439                 goto err;
440
441         inst->alg.cra_module = tmpl->module;
442
443         down_write(&crypto_alg_sem);
444
445         larval = __crypto_register_alg(&inst->alg);
446         if (IS_ERR(larval))
447                 goto unlock;
448
449         hlist_add_head(&inst->list, &tmpl->instances);
450         inst->tmpl = tmpl;
451
452 unlock:
453         up_write(&crypto_alg_sem);
454
455         err = PTR_ERR(larval);
456         if (IS_ERR(larval))
457                 goto err;
458
459         crypto_wait_for_test(larval);
460         err = 0;
461
462 err:
463         return err;
464 }
465 EXPORT_SYMBOL_GPL(crypto_register_instance);
466
467 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
468                       struct crypto_instance *inst, u32 mask)
469 {
470         int err = -EAGAIN;
471
472         spawn->inst = inst;
473         spawn->mask = mask;
474
475         down_write(&crypto_alg_sem);
476         if (!crypto_is_moribund(alg)) {
477                 list_add(&spawn->list, &alg->cra_users);
478                 spawn->alg = alg;
479                 err = 0;
480         }
481         up_write(&crypto_alg_sem);
482
483         return err;
484 }
485 EXPORT_SYMBOL_GPL(crypto_init_spawn);
486
487 void crypto_drop_spawn(struct crypto_spawn *spawn)
488 {
489         down_write(&crypto_alg_sem);
490         list_del(&spawn->list);
491         up_write(&crypto_alg_sem);
492 }
493 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
494
495 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
496                                     u32 mask)
497 {
498         struct crypto_alg *alg;
499         struct crypto_alg *alg2;
500         struct crypto_tfm *tfm;
501
502         down_read(&crypto_alg_sem);
503         alg = spawn->alg;
504         alg2 = alg;
505         if (alg2)
506                 alg2 = crypto_mod_get(alg2);
507         up_read(&crypto_alg_sem);
508
509         if (!alg2) {
510                 if (alg)
511                         crypto_shoot_alg(alg);
512                 return ERR_PTR(-EAGAIN);
513         }
514
515         tfm = ERR_PTR(-EINVAL);
516         if (unlikely((alg->cra_flags ^ type) & mask))
517                 goto out_put_alg;
518
519         tfm = __crypto_alloc_tfm(alg, type, mask);
520         if (IS_ERR(tfm))
521                 goto out_put_alg;
522
523         return tfm;
524
525 out_put_alg:
526         crypto_mod_put(alg);
527         return tfm;
528 }
529 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
530
531 int crypto_register_notifier(struct notifier_block *nb)
532 {
533         return blocking_notifier_chain_register(&crypto_chain, nb);
534 }
535 EXPORT_SYMBOL_GPL(crypto_register_notifier);
536
537 int crypto_unregister_notifier(struct notifier_block *nb)
538 {
539         return blocking_notifier_chain_unregister(&crypto_chain, nb);
540 }
541 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
542
543 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
544 {
545         struct rtattr *rta = tb[0];
546         struct crypto_attr_type *algt;
547
548         if (!rta)
549                 return ERR_PTR(-ENOENT);
550         if (RTA_PAYLOAD(rta) < sizeof(*algt))
551                 return ERR_PTR(-EINVAL);
552         if (rta->rta_type != CRYPTOA_TYPE)
553                 return ERR_PTR(-EINVAL);
554
555         algt = RTA_DATA(rta);
556
557         return algt;
558 }
559 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
560
561 int crypto_check_attr_type(struct rtattr **tb, u32 type)
562 {
563         struct crypto_attr_type *algt;
564
565         algt = crypto_get_attr_type(tb);
566         if (IS_ERR(algt))
567                 return PTR_ERR(algt);
568
569         if ((algt->type ^ type) & algt->mask)
570                 return -EINVAL;
571
572         return 0;
573 }
574 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
575
576 const char *crypto_attr_alg_name(struct rtattr *rta)
577 {
578         struct crypto_attr_alg *alga;
579
580         if (!rta)
581                 return ERR_PTR(-ENOENT);
582         if (RTA_PAYLOAD(rta) < sizeof(*alga))
583                 return ERR_PTR(-EINVAL);
584         if (rta->rta_type != CRYPTOA_ALG)
585                 return ERR_PTR(-EINVAL);
586
587         alga = RTA_DATA(rta);
588         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
589
590         return alga->name;
591 }
592 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
593
594 struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask)
595 {
596         const char *name;
597         int err;
598
599         name = crypto_attr_alg_name(rta);
600         err = PTR_ERR(name);
601         if (IS_ERR(name))
602                 return ERR_PTR(err);
603
604         return crypto_alg_mod_lookup(name, type, mask);
605 }
606 EXPORT_SYMBOL_GPL(crypto_attr_alg);
607
608 int crypto_attr_u32(struct rtattr *rta, u32 *num)
609 {
610         struct crypto_attr_u32 *nu32;
611
612         if (!rta)
613                 return -ENOENT;
614         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
615                 return -EINVAL;
616         if (rta->rta_type != CRYPTOA_U32)
617                 return -EINVAL;
618
619         nu32 = RTA_DATA(rta);
620         *num = nu32->num;
621
622         return 0;
623 }
624 EXPORT_SYMBOL_GPL(crypto_attr_u32);
625
626 struct crypto_instance *crypto_alloc_instance(const char *name,
627                                               struct crypto_alg *alg)
628 {
629         struct crypto_instance *inst;
630         struct crypto_spawn *spawn;
631         int err;
632
633         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
634         if (!inst)
635                 return ERR_PTR(-ENOMEM);
636
637         err = -ENAMETOOLONG;
638         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
639                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
640                 goto err_free_inst;
641
642         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
643                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
644                 goto err_free_inst;
645
646         spawn = crypto_instance_ctx(inst);
647         err = crypto_init_spawn(spawn, alg, inst,
648                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
649
650         if (err)
651                 goto err_free_inst;
652
653         return inst;
654
655 err_free_inst:
656         kfree(inst);
657         return ERR_PTR(err);
658 }
659 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
660
661 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
662 {
663         INIT_LIST_HEAD(&queue->list);
664         queue->backlog = &queue->list;
665         queue->qlen = 0;
666         queue->max_qlen = max_qlen;
667 }
668 EXPORT_SYMBOL_GPL(crypto_init_queue);
669
670 int crypto_enqueue_request(struct crypto_queue *queue,
671                            struct crypto_async_request *request)
672 {
673         int err = -EINPROGRESS;
674
675         if (unlikely(queue->qlen >= queue->max_qlen)) {
676                 err = -EBUSY;
677                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
678                         goto out;
679                 if (queue->backlog == &queue->list)
680                         queue->backlog = &request->list;
681         }
682
683         queue->qlen++;
684         list_add_tail(&request->list, &queue->list);
685
686 out:
687         return err;
688 }
689 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
690
691 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
692 {
693         struct list_head *request;
694
695         if (unlikely(!queue->qlen))
696                 return NULL;
697
698         queue->qlen--;
699
700         if (queue->backlog != &queue->list)
701                 queue->backlog = queue->backlog->next;
702
703         request = queue->list.next;
704         list_del(request);
705
706         return list_entry(request, struct crypto_async_request, list);
707 }
708 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
709
710 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
711 {
712         struct crypto_async_request *req;
713
714         list_for_each_entry(req, &queue->list, list) {
715                 if (req->tfm == tfm)
716                         return 1;
717         }
718
719         return 0;
720 }
721 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
722
723 static inline void crypto_inc_byte(u8 *a, unsigned int size)
724 {
725         u8 *b = (a + size);
726         u8 c;
727
728         for (; size; size--) {
729                 c = *--b + 1;
730                 *b = c;
731                 if (c)
732                         break;
733         }
734 }
735
736 void crypto_inc(u8 *a, unsigned int size)
737 {
738         __be32 *b = (__be32 *)(a + size);
739         u32 c;
740
741         for (; size >= 4; size -= 4) {
742                 c = be32_to_cpu(*--b) + 1;
743                 *b = cpu_to_be32(c);
744                 if (c)
745                         return;
746         }
747
748         crypto_inc_byte(a, size);
749 }
750 EXPORT_SYMBOL_GPL(crypto_inc);
751
752 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
753 {
754         for (; size; size--)
755                 *a++ ^= *b++;
756 }
757
758 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
759 {
760         u32 *a = (u32 *)dst;
761         u32 *b = (u32 *)src;
762
763         for (; size >= 4; size -= 4)
764                 *a++ ^= *b++;
765
766         crypto_xor_byte((u8 *)a, (u8 *)b, size);
767 }
768 EXPORT_SYMBOL_GPL(crypto_xor);
769
770 static int __init crypto_algapi_init(void)
771 {
772         crypto_init_proc();
773         return 0;
774 }
775
776 static void __exit crypto_algapi_exit(void)
777 {
778         crypto_exit_proc();
779 }
780
781 module_init(crypto_algapi_init);
782 module_exit(crypto_algapi_exit);
783
784 MODULE_LICENSE("GPL");
785 MODULE_DESCRIPTION("Cryptographic algorithms API");