3b9ef92da6fc3ce586fc0904469a706362011ce5
[pandora-kernel.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/slab.h>
21 #include <linux/string.h>
22
23 #include "internal.h"
24
25 static LIST_HEAD(crypto_template_list);
26
27 void crypto_larval_error(const char *name, u32 type, u32 mask)
28 {
29         struct crypto_alg *alg;
30
31         alg = crypto_alg_lookup(name, type, mask);
32
33         if (alg) {
34                 if (crypto_is_larval(alg)) {
35                         struct crypto_larval *larval = (void *)alg;
36                         complete_all(&larval->completion);
37                 }
38                 crypto_mod_put(alg);
39         }
40 }
41 EXPORT_SYMBOL_GPL(crypto_larval_error);
42
43 static inline int crypto_set_driver_name(struct crypto_alg *alg)
44 {
45         static const char suffix[] = "-generic";
46         char *driver_name = alg->cra_driver_name;
47         int len;
48
49         if (*driver_name)
50                 return 0;
51
52         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
53         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
54                 return -ENAMETOOLONG;
55
56         memcpy(driver_name + len, suffix, sizeof(suffix));
57         return 0;
58 }
59
60 static int crypto_check_alg(struct crypto_alg *alg)
61 {
62         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
63                 return -EINVAL;
64
65         if (alg->cra_blocksize > PAGE_SIZE / 8)
66                 return -EINVAL;
67
68         if (alg->cra_priority < 0)
69                 return -EINVAL;
70
71         return crypto_set_driver_name(alg);
72 }
73
74 static void crypto_destroy_instance(struct crypto_alg *alg)
75 {
76         struct crypto_instance *inst = (void *)alg;
77         struct crypto_template *tmpl = inst->tmpl;
78
79         tmpl->free(inst);
80         crypto_tmpl_put(tmpl);
81 }
82
83 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
84                                             struct list_head *stack,
85                                             struct list_head *top,
86                                             struct list_head *secondary_spawns)
87 {
88         struct crypto_spawn *spawn, *n;
89
90         if (list_empty(stack))
91                 return NULL;
92
93         spawn = list_first_entry(stack, struct crypto_spawn, list);
94         n = list_entry(spawn->list.next, struct crypto_spawn, list);
95
96         if (spawn->alg && &n->list != stack && !n->alg)
97                 n->alg = (n->list.next == stack) ? alg :
98                          &list_entry(n->list.next, struct crypto_spawn,
99                                      list)->inst->alg;
100
101         list_move(&spawn->list, secondary_spawns);
102
103         return &n->list == stack ? top : &n->inst->alg.cra_users;
104 }
105
106 static void crypto_remove_spawn(struct crypto_spawn *spawn,
107                                 struct list_head *list)
108 {
109         struct crypto_instance *inst = spawn->inst;
110         struct crypto_template *tmpl = inst->tmpl;
111
112         if (crypto_is_dead(&inst->alg))
113                 return;
114
115         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
116         if (hlist_unhashed(&inst->list))
117                 return;
118
119         if (!tmpl || !crypto_tmpl_get(tmpl))
120                 return;
121
122         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
123         list_move(&inst->alg.cra_list, list);
124         hlist_del(&inst->list);
125         inst->alg.cra_destroy = crypto_destroy_instance;
126
127         BUG_ON(!list_empty(&inst->alg.cra_users));
128 }
129
130 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
131                           struct crypto_alg *nalg)
132 {
133         u32 new_type = (nalg ?: alg)->cra_flags;
134         struct crypto_spawn *spawn, *n;
135         LIST_HEAD(secondary_spawns);
136         struct list_head *spawns;
137         LIST_HEAD(stack);
138         LIST_HEAD(top);
139
140         spawns = &alg->cra_users;
141         list_for_each_entry_safe(spawn, n, spawns, list) {
142                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
143                         continue;
144
145                 list_move(&spawn->list, &top);
146         }
147
148         spawns = &top;
149         do {
150                 while (!list_empty(spawns)) {
151                         struct crypto_instance *inst;
152
153                         spawn = list_first_entry(spawns, struct crypto_spawn,
154                                                  list);
155                         inst = spawn->inst;
156
157                         BUG_ON(&inst->alg == alg);
158
159                         list_move(&spawn->list, &stack);
160
161                         if (&inst->alg == nalg)
162                                 break;
163
164                         spawn->alg = NULL;
165                         spawns = &inst->alg.cra_users;
166                 }
167         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
168                                               &secondary_spawns)));
169
170         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
171                 if (spawn->alg)
172                         list_move(&spawn->list, &spawn->alg->cra_users);
173                 else
174                         crypto_remove_spawn(spawn, list);
175         }
176 }
177 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
178
179 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
180 {
181         struct crypto_alg *q;
182         struct crypto_larval *larval;
183         int ret = -EAGAIN;
184
185         if (crypto_is_dead(alg))
186                 goto err;
187
188         INIT_LIST_HEAD(&alg->cra_users);
189
190         /* No cheating! */
191         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
192
193         ret = -EEXIST;
194
195         atomic_set(&alg->cra_refcnt, 1);
196         list_for_each_entry(q, &crypto_alg_list, cra_list) {
197                 if (q == alg)
198                         goto err;
199
200                 if (crypto_is_moribund(q))
201                         continue;
202
203                 if (crypto_is_larval(q)) {
204                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
205                                 goto err;
206                         continue;
207                 }
208
209                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
210                     !strcmp(q->cra_name, alg->cra_driver_name))
211                         goto err;
212         }
213
214         larval = crypto_larval_alloc(alg->cra_name,
215                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
216         if (IS_ERR(larval))
217                 goto out;
218
219         ret = -ENOENT;
220         larval->adult = crypto_mod_get(alg);
221         if (!larval->adult)
222                 goto free_larval;
223
224         atomic_set(&larval->alg.cra_refcnt, 1);
225         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
226                CRYPTO_MAX_ALG_NAME);
227         larval->alg.cra_priority = alg->cra_priority;
228
229         list_add(&alg->cra_list, &crypto_alg_list);
230         list_add(&larval->alg.cra_list, &crypto_alg_list);
231
232 out:
233         return larval;
234
235 free_larval:
236         kfree(larval);
237 err:
238         larval = ERR_PTR(ret);
239         goto out;
240 }
241
242 void crypto_alg_tested(const char *name, int err)
243 {
244         struct crypto_larval *test;
245         struct crypto_alg *alg;
246         struct crypto_alg *q;
247         LIST_HEAD(list);
248
249         down_write(&crypto_alg_sem);
250         list_for_each_entry(q, &crypto_alg_list, cra_list) {
251                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
252                         continue;
253
254                 test = (struct crypto_larval *)q;
255
256                 if (!strcmp(q->cra_driver_name, name))
257                         goto found;
258         }
259
260         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
261         goto unlock;
262
263 found:
264         q->cra_flags |= CRYPTO_ALG_DEAD;
265         alg = test->adult;
266         if (err || list_empty(&alg->cra_list))
267                 goto complete;
268
269         alg->cra_flags |= CRYPTO_ALG_TESTED;
270
271         list_for_each_entry(q, &crypto_alg_list, cra_list) {
272                 if (q == alg)
273                         continue;
274
275                 if (crypto_is_moribund(q))
276                         continue;
277
278                 if (crypto_is_larval(q)) {
279                         struct crypto_larval *larval = (void *)q;
280
281                         /*
282                          * Check to see if either our generic name or
283                          * specific name can satisfy the name requested
284                          * by the larval entry q.
285                          */
286                         if (strcmp(alg->cra_name, q->cra_name) &&
287                             strcmp(alg->cra_driver_name, q->cra_name))
288                                 continue;
289
290                         if (larval->adult)
291                                 continue;
292                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
293                                 continue;
294                         if (!crypto_mod_get(alg))
295                                 continue;
296
297                         larval->adult = alg;
298                         complete_all(&larval->completion);
299                         continue;
300                 }
301
302                 if (strcmp(alg->cra_name, q->cra_name))
303                         continue;
304
305                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
306                     q->cra_priority > alg->cra_priority)
307                         continue;
308
309                 crypto_remove_spawns(q, &list, alg);
310         }
311
312 complete:
313         complete_all(&test->completion);
314
315 unlock:
316         up_write(&crypto_alg_sem);
317
318         crypto_remove_final(&list);
319 }
320 EXPORT_SYMBOL_GPL(crypto_alg_tested);
321
322 void crypto_remove_final(struct list_head *list)
323 {
324         struct crypto_alg *alg;
325         struct crypto_alg *n;
326
327         list_for_each_entry_safe(alg, n, list, cra_list) {
328                 list_del_init(&alg->cra_list);
329                 crypto_alg_put(alg);
330         }
331 }
332 EXPORT_SYMBOL_GPL(crypto_remove_final);
333
334 static void crypto_wait_for_test(struct crypto_larval *larval)
335 {
336         int err;
337
338         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
339         if (err != NOTIFY_STOP) {
340                 if (WARN_ON(err != NOTIFY_DONE))
341                         goto out;
342                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
343         }
344
345         err = wait_for_completion_interruptible(&larval->completion);
346         WARN_ON(err);
347
348 out:
349         crypto_larval_kill(&larval->alg);
350 }
351
352 int crypto_register_alg(struct crypto_alg *alg)
353 {
354         struct crypto_larval *larval;
355         int err;
356
357         err = crypto_check_alg(alg);
358         if (err)
359                 return err;
360
361         down_write(&crypto_alg_sem);
362         larval = __crypto_register_alg(alg);
363         up_write(&crypto_alg_sem);
364
365         if (IS_ERR(larval))
366                 return PTR_ERR(larval);
367
368         crypto_wait_for_test(larval);
369         return 0;
370 }
371 EXPORT_SYMBOL_GPL(crypto_register_alg);
372
373 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
374 {
375         if (unlikely(list_empty(&alg->cra_list)))
376                 return -ENOENT;
377
378         alg->cra_flags |= CRYPTO_ALG_DEAD;
379
380         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
381         list_del_init(&alg->cra_list);
382         crypto_remove_spawns(alg, list, NULL);
383
384         return 0;
385 }
386
387 int crypto_unregister_alg(struct crypto_alg *alg)
388 {
389         int ret;
390         LIST_HEAD(list);
391
392         down_write(&crypto_alg_sem);
393         ret = crypto_remove_alg(alg, &list);
394         up_write(&crypto_alg_sem);
395
396         if (ret)
397                 return ret;
398
399         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
400         if (alg->cra_destroy)
401                 alg->cra_destroy(alg);
402
403         crypto_remove_final(&list);
404         return 0;
405 }
406 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
407
408 int crypto_register_template(struct crypto_template *tmpl)
409 {
410         struct crypto_template *q;
411         int err = -EEXIST;
412
413         down_write(&crypto_alg_sem);
414
415         list_for_each_entry(q, &crypto_template_list, list) {
416                 if (q == tmpl)
417                         goto out;
418         }
419
420         list_add(&tmpl->list, &crypto_template_list);
421         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
422         err = 0;
423 out:
424         up_write(&crypto_alg_sem);
425         return err;
426 }
427 EXPORT_SYMBOL_GPL(crypto_register_template);
428
429 void crypto_unregister_template(struct crypto_template *tmpl)
430 {
431         struct crypto_instance *inst;
432         struct hlist_node *p, *n;
433         struct hlist_head *list;
434         LIST_HEAD(users);
435
436         down_write(&crypto_alg_sem);
437
438         BUG_ON(list_empty(&tmpl->list));
439         list_del_init(&tmpl->list);
440
441         list = &tmpl->instances;
442         hlist_for_each_entry(inst, p, list, list) {
443                 int err = crypto_remove_alg(&inst->alg, &users);
444                 BUG_ON(err);
445         }
446
447         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
448
449         up_write(&crypto_alg_sem);
450
451         hlist_for_each_entry_safe(inst, p, n, list, list) {
452                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
453                 tmpl->free(inst);
454         }
455         crypto_remove_final(&users);
456 }
457 EXPORT_SYMBOL_GPL(crypto_unregister_template);
458
459 static struct crypto_template *__crypto_lookup_template(const char *name)
460 {
461         struct crypto_template *q, *tmpl = NULL;
462
463         down_read(&crypto_alg_sem);
464         list_for_each_entry(q, &crypto_template_list, list) {
465                 if (strcmp(q->name, name))
466                         continue;
467                 if (unlikely(!crypto_tmpl_get(q)))
468                         continue;
469
470                 tmpl = q;
471                 break;
472         }
473         up_read(&crypto_alg_sem);
474
475         return tmpl;
476 }
477
478 struct crypto_template *crypto_lookup_template(const char *name)
479 {
480         return try_then_request_module(__crypto_lookup_template(name),
481                                        "crypto-%s", name);
482 }
483 EXPORT_SYMBOL_GPL(crypto_lookup_template);
484
485 int crypto_register_instance(struct crypto_template *tmpl,
486                              struct crypto_instance *inst)
487 {
488         struct crypto_larval *larval;
489         int err;
490
491         err = crypto_check_alg(&inst->alg);
492         if (err)
493                 goto err;
494
495         inst->alg.cra_module = tmpl->module;
496         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
497
498         down_write(&crypto_alg_sem);
499
500         larval = __crypto_register_alg(&inst->alg);
501         if (IS_ERR(larval))
502                 goto unlock;
503
504         hlist_add_head(&inst->list, &tmpl->instances);
505         inst->tmpl = tmpl;
506
507 unlock:
508         up_write(&crypto_alg_sem);
509
510         err = PTR_ERR(larval);
511         if (IS_ERR(larval))
512                 goto err;
513
514         crypto_wait_for_test(larval);
515         err = 0;
516
517 err:
518         return err;
519 }
520 EXPORT_SYMBOL_GPL(crypto_register_instance);
521
522 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
523                       struct crypto_instance *inst, u32 mask)
524 {
525         int err = -EAGAIN;
526
527         spawn->inst = inst;
528         spawn->mask = mask;
529
530         down_write(&crypto_alg_sem);
531         if (!crypto_is_moribund(alg)) {
532                 list_add(&spawn->list, &alg->cra_users);
533                 spawn->alg = alg;
534                 err = 0;
535         }
536         up_write(&crypto_alg_sem);
537
538         return err;
539 }
540 EXPORT_SYMBOL_GPL(crypto_init_spawn);
541
542 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
543                        struct crypto_instance *inst,
544                        const struct crypto_type *frontend)
545 {
546         int err = -EINVAL;
547
548         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
549                 goto out;
550
551         spawn->frontend = frontend;
552         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
553
554 out:
555         return err;
556 }
557 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
558
559 void crypto_drop_spawn(struct crypto_spawn *spawn)
560 {
561         if (!spawn->alg)
562                 return;
563
564         down_write(&crypto_alg_sem);
565         list_del(&spawn->list);
566         up_write(&crypto_alg_sem);
567 }
568 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
569
570 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
571 {
572         struct crypto_alg *alg;
573         struct crypto_alg *alg2;
574
575         down_read(&crypto_alg_sem);
576         alg = spawn->alg;
577         alg2 = alg;
578         if (alg2)
579                 alg2 = crypto_mod_get(alg2);
580         up_read(&crypto_alg_sem);
581
582         if (!alg2) {
583                 if (alg)
584                         crypto_shoot_alg(alg);
585                 return ERR_PTR(-EAGAIN);
586         }
587
588         return alg;
589 }
590
591 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
592                                     u32 mask)
593 {
594         struct crypto_alg *alg;
595         struct crypto_tfm *tfm;
596
597         alg = crypto_spawn_alg(spawn);
598         if (IS_ERR(alg))
599                 return ERR_CAST(alg);
600
601         tfm = ERR_PTR(-EINVAL);
602         if (unlikely((alg->cra_flags ^ type) & mask))
603                 goto out_put_alg;
604
605         tfm = __crypto_alloc_tfm(alg, type, mask);
606         if (IS_ERR(tfm))
607                 goto out_put_alg;
608
609         return tfm;
610
611 out_put_alg:
612         crypto_mod_put(alg);
613         return tfm;
614 }
615 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
616
617 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
618 {
619         struct crypto_alg *alg;
620         struct crypto_tfm *tfm;
621
622         alg = crypto_spawn_alg(spawn);
623         if (IS_ERR(alg))
624                 return ERR_CAST(alg);
625
626         tfm = crypto_create_tfm(alg, spawn->frontend);
627         if (IS_ERR(tfm))
628                 goto out_put_alg;
629
630         return tfm;
631
632 out_put_alg:
633         crypto_mod_put(alg);
634         return tfm;
635 }
636 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
637
638 int crypto_register_notifier(struct notifier_block *nb)
639 {
640         return blocking_notifier_chain_register(&crypto_chain, nb);
641 }
642 EXPORT_SYMBOL_GPL(crypto_register_notifier);
643
644 int crypto_unregister_notifier(struct notifier_block *nb)
645 {
646         return blocking_notifier_chain_unregister(&crypto_chain, nb);
647 }
648 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
649
650 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
651 {
652         struct rtattr *rta = tb[0];
653         struct crypto_attr_type *algt;
654
655         if (!rta)
656                 return ERR_PTR(-ENOENT);
657         if (RTA_PAYLOAD(rta) < sizeof(*algt))
658                 return ERR_PTR(-EINVAL);
659         if (rta->rta_type != CRYPTOA_TYPE)
660                 return ERR_PTR(-EINVAL);
661
662         algt = RTA_DATA(rta);
663
664         return algt;
665 }
666 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
667
668 int crypto_check_attr_type(struct rtattr **tb, u32 type)
669 {
670         struct crypto_attr_type *algt;
671
672         algt = crypto_get_attr_type(tb);
673         if (IS_ERR(algt))
674                 return PTR_ERR(algt);
675
676         if ((algt->type ^ type) & algt->mask)
677                 return -EINVAL;
678
679         return 0;
680 }
681 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
682
683 const char *crypto_attr_alg_name(struct rtattr *rta)
684 {
685         struct crypto_attr_alg *alga;
686
687         if (!rta)
688                 return ERR_PTR(-ENOENT);
689         if (RTA_PAYLOAD(rta) < sizeof(*alga))
690                 return ERR_PTR(-EINVAL);
691         if (rta->rta_type != CRYPTOA_ALG)
692                 return ERR_PTR(-EINVAL);
693
694         alga = RTA_DATA(rta);
695         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
696
697         return alga->name;
698 }
699 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
700
701 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
702                                     const struct crypto_type *frontend,
703                                     u32 type, u32 mask)
704 {
705         const char *name;
706         int err;
707
708         name = crypto_attr_alg_name(rta);
709         err = PTR_ERR(name);
710         if (IS_ERR(name))
711                 return ERR_PTR(err);
712
713         return crypto_find_alg(name, frontend, type, mask);
714 }
715 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
716
717 int crypto_attr_u32(struct rtattr *rta, u32 *num)
718 {
719         struct crypto_attr_u32 *nu32;
720
721         if (!rta)
722                 return -ENOENT;
723         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
724                 return -EINVAL;
725         if (rta->rta_type != CRYPTOA_U32)
726                 return -EINVAL;
727
728         nu32 = RTA_DATA(rta);
729         *num = nu32->num;
730
731         return 0;
732 }
733 EXPORT_SYMBOL_GPL(crypto_attr_u32);
734
735 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
736                              unsigned int head)
737 {
738         struct crypto_instance *inst;
739         char *p;
740         int err;
741
742         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
743                     GFP_KERNEL);
744         if (!p)
745                 return ERR_PTR(-ENOMEM);
746
747         inst = (void *)(p + head);
748
749         err = -ENAMETOOLONG;
750         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
751                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
752                 goto err_free_inst;
753
754         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
755                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
756                 goto err_free_inst;
757
758         return p;
759
760 err_free_inst:
761         kfree(p);
762         return ERR_PTR(err);
763 }
764 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
765
766 struct crypto_instance *crypto_alloc_instance(const char *name,
767                                               struct crypto_alg *alg)
768 {
769         struct crypto_instance *inst;
770         struct crypto_spawn *spawn;
771         int err;
772
773         inst = crypto_alloc_instance2(name, alg, 0);
774         if (IS_ERR(inst))
775                 goto out;
776
777         spawn = crypto_instance_ctx(inst);
778         err = crypto_init_spawn(spawn, alg, inst,
779                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
780
781         if (err)
782                 goto err_free_inst;
783
784         return inst;
785
786 err_free_inst:
787         kfree(inst);
788         inst = ERR_PTR(err);
789
790 out:
791         return inst;
792 }
793 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
794
795 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
796 {
797         INIT_LIST_HEAD(&queue->list);
798         queue->backlog = &queue->list;
799         queue->qlen = 0;
800         queue->max_qlen = max_qlen;
801 }
802 EXPORT_SYMBOL_GPL(crypto_init_queue);
803
804 int crypto_enqueue_request(struct crypto_queue *queue,
805                            struct crypto_async_request *request)
806 {
807         int err = -EINPROGRESS;
808
809         if (unlikely(queue->qlen >= queue->max_qlen)) {
810                 err = -EBUSY;
811                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
812                         goto out;
813                 if (queue->backlog == &queue->list)
814                         queue->backlog = &request->list;
815         }
816
817         queue->qlen++;
818         list_add_tail(&request->list, &queue->list);
819
820 out:
821         return err;
822 }
823 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
824
825 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
826 {
827         struct list_head *request;
828
829         if (unlikely(!queue->qlen))
830                 return NULL;
831
832         queue->qlen--;
833
834         if (queue->backlog != &queue->list)
835                 queue->backlog = queue->backlog->next;
836
837         request = queue->list.next;
838         list_del(request);
839
840         return (char *)list_entry(request, struct crypto_async_request, list) -
841                offset;
842 }
843 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
844
845 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
846 {
847         return __crypto_dequeue_request(queue, 0);
848 }
849 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
850
851 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
852 {
853         struct crypto_async_request *req;
854
855         list_for_each_entry(req, &queue->list, list) {
856                 if (req->tfm == tfm)
857                         return 1;
858         }
859
860         return 0;
861 }
862 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
863
864 static inline void crypto_inc_byte(u8 *a, unsigned int size)
865 {
866         u8 *b = (a + size);
867         u8 c;
868
869         for (; size; size--) {
870                 c = *--b + 1;
871                 *b = c;
872                 if (c)
873                         break;
874         }
875 }
876
877 void crypto_inc(u8 *a, unsigned int size)
878 {
879         __be32 *b = (__be32 *)(a + size);
880         u32 c;
881
882         for (; size >= 4; size -= 4) {
883                 c = be32_to_cpu(*--b) + 1;
884                 *b = cpu_to_be32(c);
885                 if (c)
886                         return;
887         }
888
889         crypto_inc_byte(a, size);
890 }
891 EXPORT_SYMBOL_GPL(crypto_inc);
892
893 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
894 {
895         for (; size; size--)
896                 *a++ ^= *b++;
897 }
898
899 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
900 {
901         u32 *a = (u32 *)dst;
902         u32 *b = (u32 *)src;
903
904         for (; size >= 4; size -= 4)
905                 *a++ ^= *b++;
906
907         crypto_xor_byte((u8 *)a, (u8 *)b, size);
908 }
909 EXPORT_SYMBOL_GPL(crypto_xor);
910
911 static int __init crypto_algapi_init(void)
912 {
913         crypto_init_proc();
914         return 0;
915 }
916
917 static void __exit crypto_algapi_exit(void)
918 {
919         crypto_exit_proc();
920 }
921
922 module_init(crypto_algapi_init);
923 module_exit(crypto_algapi_exit);
924
925 MODULE_LICENSE("GPL");
926 MODULE_DESCRIPTION("Cryptographic algorithms API");