crypto: api - Do not displace newly registered algorithms
[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 struct list_head *crypto_more_spawns(struct crypto_alg *alg,
85                                             struct list_head *stack,
86                                             struct list_head *top,
87                                             struct list_head *secondary_spawns)
88 {
89         struct crypto_spawn *spawn, *n;
90
91         if (list_empty(stack))
92                 return NULL;
93
94         spawn = list_first_entry(stack, struct crypto_spawn, list);
95         n = list_entry(spawn->list.next, struct crypto_spawn, list);
96
97         if (spawn->alg && &n->list != stack && !n->alg)
98                 n->alg = (n->list.next == stack) ? alg :
99                          &list_entry(n->list.next, struct crypto_spawn,
100                                      list)->inst->alg;
101
102         list_move(&spawn->list, secondary_spawns);
103
104         return &n->list == stack ? top : &n->inst->alg.cra_users;
105 }
106
107 static void crypto_remove_spawn(struct crypto_spawn *spawn,
108                                 struct list_head *list)
109 {
110         struct crypto_instance *inst = spawn->inst;
111         struct crypto_template *tmpl = inst->tmpl;
112
113         if (crypto_is_dead(&inst->alg))
114                 return;
115
116         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
117         if (hlist_unhashed(&inst->list))
118                 return;
119
120         if (!tmpl || !crypto_tmpl_get(tmpl))
121                 return;
122
123         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
124         list_move(&inst->alg.cra_list, list);
125         hlist_del(&inst->list);
126         inst->alg.cra_destroy = crypto_destroy_instance;
127
128         BUG_ON(!list_empty(&inst->alg.cra_users));
129 }
130
131 static void crypto_remove_spawns(struct crypto_alg *alg,
132                                  struct list_head *list,
133                                  struct crypto_alg *nalg)
134 {
135         u32 new_type = (nalg ?: alg)->cra_flags;
136         struct crypto_spawn *spawn, *n;
137         LIST_HEAD(secondary_spawns);
138         struct list_head *spawns;
139         LIST_HEAD(stack);
140         LIST_HEAD(top);
141
142         spawns = &alg->cra_users;
143         list_for_each_entry_safe(spawn, n, spawns, list) {
144                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
145                         continue;
146
147                 list_move(&spawn->list, &top);
148         }
149
150         spawns = &top;
151         do {
152                 while (!list_empty(spawns)) {
153                         struct crypto_instance *inst;
154
155                         spawn = list_first_entry(spawns, struct crypto_spawn,
156                                                  list);
157                         inst = spawn->inst;
158
159                         BUG_ON(&inst->alg == alg);
160
161                         list_move(&spawn->list, &stack);
162
163                         if (&inst->alg == nalg)
164                                 break;
165
166                         spawn->alg = NULL;
167                         spawns = &inst->alg.cra_users;
168                 }
169         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
170                                               &secondary_spawns)));
171
172         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
173                 if (spawn->alg)
174                         list_move(&spawn->list, &spawn->alg->cra_users);
175                 else
176                         crypto_remove_spawn(spawn, list);
177         }
178 }
179
180 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
181 {
182         struct crypto_alg *q;
183         struct crypto_larval *larval;
184         int ret = -EAGAIN;
185
186         if (crypto_is_dead(alg))
187                 goto err;
188
189         INIT_LIST_HEAD(&alg->cra_users);
190
191         /* No cheating! */
192         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
193
194         ret = -EEXIST;
195
196         atomic_set(&alg->cra_refcnt, 1);
197         list_for_each_entry(q, &crypto_alg_list, cra_list) {
198                 if (q == alg)
199                         goto err;
200
201                 if (crypto_is_moribund(q))
202                         continue;
203
204                 if (crypto_is_larval(q)) {
205                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
206                                 goto err;
207                         continue;
208                 }
209
210                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
211                     !strcmp(q->cra_name, alg->cra_driver_name))
212                         goto err;
213         }
214
215         larval = crypto_larval_alloc(alg->cra_name,
216                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
217         if (IS_ERR(larval))
218                 goto out;
219
220         ret = -ENOENT;
221         larval->adult = crypto_mod_get(alg);
222         if (!larval->adult)
223                 goto free_larval;
224
225         atomic_set(&larval->alg.cra_refcnt, 1);
226         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
227                CRYPTO_MAX_ALG_NAME);
228         larval->alg.cra_priority = alg->cra_priority;
229
230         list_add(&alg->cra_list, &crypto_alg_list);
231         list_add(&larval->alg.cra_list, &crypto_alg_list);
232
233 out:    
234         return larval;
235
236 free_larval:
237         kfree(larval);
238 err:
239         larval = ERR_PTR(ret);
240         goto out;
241 }
242
243 void crypto_alg_tested(const char *name, int err)
244 {
245         struct crypto_larval *test;
246         struct crypto_alg *alg;
247         struct crypto_alg *q;
248         LIST_HEAD(list);
249
250         down_write(&crypto_alg_sem);
251         list_for_each_entry(q, &crypto_alg_list, cra_list) {
252                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
253                         continue;
254
255                 test = (struct crypto_larval *)q;
256
257                 if (!strcmp(q->cra_driver_name, name))
258                         goto found;
259         }
260
261         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
262         goto unlock;
263
264 found:
265         q->cra_flags |= CRYPTO_ALG_DEAD;
266         alg = test->adult;
267         if (err || list_empty(&alg->cra_list))
268                 goto complete;
269
270         alg->cra_flags |= CRYPTO_ALG_TESTED;
271
272         list_for_each_entry(q, &crypto_alg_list, cra_list) {
273                 if (q == alg)
274                         continue;
275
276                 if (crypto_is_moribund(q))
277                         continue;
278
279                 if (crypto_is_larval(q)) {
280                         struct crypto_larval *larval = (void *)q;
281
282                         /*
283                          * Check to see if either our generic name or
284                          * specific name can satisfy the name requested
285                          * by the larval entry q.
286                          */
287                         if (strcmp(alg->cra_name, q->cra_name) &&
288                             strcmp(alg->cra_driver_name, q->cra_name))
289                                 continue;
290
291                         if (larval->adult)
292                                 continue;
293                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
294                                 continue;
295                         if (!crypto_mod_get(alg))
296                                 continue;
297
298                         larval->adult = alg;
299                         complete_all(&larval->completion);
300                         continue;
301                 }
302
303                 if (strcmp(alg->cra_name, q->cra_name))
304                         continue;
305
306                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
307                     q->cra_priority > alg->cra_priority)
308                         continue;
309
310                 crypto_remove_spawns(q, &list, alg);
311         }
312
313 complete:
314         complete_all(&test->completion);
315
316 unlock:
317         up_write(&crypto_alg_sem);
318
319         crypto_remove_final(&list);
320 }
321 EXPORT_SYMBOL_GPL(crypto_alg_tested);
322
323 static void crypto_remove_final(struct list_head *list)
324 {
325         struct crypto_alg *alg;
326         struct crypto_alg *n;
327
328         list_for_each_entry_safe(alg, n, list, cra_list) {
329                 list_del_init(&alg->cra_list);
330                 crypto_alg_put(alg);
331         }
332 }
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), name);
481 }
482 EXPORT_SYMBOL_GPL(crypto_lookup_template);
483
484 int crypto_register_instance(struct crypto_template *tmpl,
485                              struct crypto_instance *inst)
486 {
487         struct crypto_larval *larval;
488         int err;
489
490         err = crypto_check_alg(&inst->alg);
491         if (err)
492                 goto err;
493
494         inst->alg.cra_module = tmpl->module;
495
496         down_write(&crypto_alg_sem);
497
498         larval = __crypto_register_alg(&inst->alg);
499         if (IS_ERR(larval))
500                 goto unlock;
501
502         hlist_add_head(&inst->list, &tmpl->instances);
503         inst->tmpl = tmpl;
504
505 unlock:
506         up_write(&crypto_alg_sem);
507
508         err = PTR_ERR(larval);
509         if (IS_ERR(larval))
510                 goto err;
511
512         crypto_wait_for_test(larval);
513         err = 0;
514
515 err:
516         return err;
517 }
518 EXPORT_SYMBOL_GPL(crypto_register_instance);
519
520 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
521                       struct crypto_instance *inst, u32 mask)
522 {
523         int err = -EAGAIN;
524
525         spawn->inst = inst;
526         spawn->mask = mask;
527
528         down_write(&crypto_alg_sem);
529         if (!crypto_is_moribund(alg)) {
530                 list_add(&spawn->list, &alg->cra_users);
531                 spawn->alg = alg;
532                 err = 0;
533         }
534         up_write(&crypto_alg_sem);
535
536         return err;
537 }
538 EXPORT_SYMBOL_GPL(crypto_init_spawn);
539
540 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
541                        struct crypto_instance *inst,
542                        const struct crypto_type *frontend)
543 {
544         int err = -EINVAL;
545
546         if (frontend && (alg->cra_flags ^ frontend->type) & frontend->maskset)
547                 goto out;
548
549         spawn->frontend = frontend;
550         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
551
552 out:
553         return err;
554 }
555 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
556
557 void crypto_drop_spawn(struct crypto_spawn *spawn)
558 {
559         if (!spawn->alg)
560                 return;
561
562         down_write(&crypto_alg_sem);
563         list_del(&spawn->list);
564         up_write(&crypto_alg_sem);
565 }
566 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
567
568 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
569 {
570         struct crypto_alg *alg;
571         struct crypto_alg *alg2;
572
573         down_read(&crypto_alg_sem);
574         alg = spawn->alg;
575         alg2 = alg;
576         if (alg2)
577                 alg2 = crypto_mod_get(alg2);
578         up_read(&crypto_alg_sem);
579
580         if (!alg2) {
581                 if (alg)
582                         crypto_shoot_alg(alg);
583                 return ERR_PTR(-EAGAIN);
584         }
585
586         return alg;
587 }
588
589 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
590                                     u32 mask)
591 {
592         struct crypto_alg *alg;
593         struct crypto_tfm *tfm;
594
595         alg = crypto_spawn_alg(spawn);
596         if (IS_ERR(alg))
597                 return ERR_CAST(alg);
598
599         tfm = ERR_PTR(-EINVAL);
600         if (unlikely((alg->cra_flags ^ type) & mask))
601                 goto out_put_alg;
602
603         tfm = __crypto_alloc_tfm(alg, type, mask);
604         if (IS_ERR(tfm))
605                 goto out_put_alg;
606
607         return tfm;
608
609 out_put_alg:
610         crypto_mod_put(alg);
611         return tfm;
612 }
613 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
614
615 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
616 {
617         struct crypto_alg *alg;
618         struct crypto_tfm *tfm;
619
620         alg = crypto_spawn_alg(spawn);
621         if (IS_ERR(alg))
622                 return ERR_CAST(alg);
623
624         tfm = crypto_create_tfm(alg, spawn->frontend);
625         if (IS_ERR(tfm))
626                 goto out_put_alg;
627
628         return tfm;
629
630 out_put_alg:
631         crypto_mod_put(alg);
632         return tfm;
633 }
634 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
635
636 int crypto_register_notifier(struct notifier_block *nb)
637 {
638         return blocking_notifier_chain_register(&crypto_chain, nb);
639 }
640 EXPORT_SYMBOL_GPL(crypto_register_notifier);
641
642 int crypto_unregister_notifier(struct notifier_block *nb)
643 {
644         return blocking_notifier_chain_unregister(&crypto_chain, nb);
645 }
646 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
647
648 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
649 {
650         struct rtattr *rta = tb[0];
651         struct crypto_attr_type *algt;
652
653         if (!rta)
654                 return ERR_PTR(-ENOENT);
655         if (RTA_PAYLOAD(rta) < sizeof(*algt))
656                 return ERR_PTR(-EINVAL);
657         if (rta->rta_type != CRYPTOA_TYPE)
658                 return ERR_PTR(-EINVAL);
659
660         algt = RTA_DATA(rta);
661
662         return algt;
663 }
664 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
665
666 int crypto_check_attr_type(struct rtattr **tb, u32 type)
667 {
668         struct crypto_attr_type *algt;
669
670         algt = crypto_get_attr_type(tb);
671         if (IS_ERR(algt))
672                 return PTR_ERR(algt);
673
674         if ((algt->type ^ type) & algt->mask)
675                 return -EINVAL;
676
677         return 0;
678 }
679 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
680
681 const char *crypto_attr_alg_name(struct rtattr *rta)
682 {
683         struct crypto_attr_alg *alga;
684
685         if (!rta)
686                 return ERR_PTR(-ENOENT);
687         if (RTA_PAYLOAD(rta) < sizeof(*alga))
688                 return ERR_PTR(-EINVAL);
689         if (rta->rta_type != CRYPTOA_ALG)
690                 return ERR_PTR(-EINVAL);
691
692         alga = RTA_DATA(rta);
693         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
694
695         return alga->name;
696 }
697 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
698
699 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
700                                     const struct crypto_type *frontend,
701                                     u32 type, u32 mask)
702 {
703         const char *name;
704         int err;
705
706         name = crypto_attr_alg_name(rta);
707         err = PTR_ERR(name);
708         if (IS_ERR(name))
709                 return ERR_PTR(err);
710
711         return crypto_find_alg(name, frontend, type, mask);
712 }
713 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
714
715 int crypto_attr_u32(struct rtattr *rta, u32 *num)
716 {
717         struct crypto_attr_u32 *nu32;
718
719         if (!rta)
720                 return -ENOENT;
721         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
722                 return -EINVAL;
723         if (rta->rta_type != CRYPTOA_U32)
724                 return -EINVAL;
725
726         nu32 = RTA_DATA(rta);
727         *num = nu32->num;
728
729         return 0;
730 }
731 EXPORT_SYMBOL_GPL(crypto_attr_u32);
732
733 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
734                              unsigned int head)
735 {
736         struct crypto_instance *inst;
737         char *p;
738         int err;
739
740         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
741                     GFP_KERNEL);
742         if (!p)
743                 return ERR_PTR(-ENOMEM);
744
745         inst = (void *)(p + head);
746
747         err = -ENAMETOOLONG;
748         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
749                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
750                 goto err_free_inst;
751
752         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
753                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
754                 goto err_free_inst;
755
756         return p;
757
758 err_free_inst:
759         kfree(p);
760         return ERR_PTR(err);
761 }
762 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
763
764 struct crypto_instance *crypto_alloc_instance(const char *name,
765                                               struct crypto_alg *alg)
766 {
767         struct crypto_instance *inst;
768         struct crypto_spawn *spawn;
769         int err;
770
771         inst = crypto_alloc_instance2(name, alg, 0);
772         if (IS_ERR(inst))
773                 goto out;
774
775         spawn = crypto_instance_ctx(inst);
776         err = crypto_init_spawn(spawn, alg, inst,
777                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
778
779         if (err)
780                 goto err_free_inst;
781
782         return inst;
783
784 err_free_inst:
785         kfree(inst);
786         inst = ERR_PTR(err);
787
788 out:
789         return inst;
790 }
791 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
792
793 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
794 {
795         INIT_LIST_HEAD(&queue->list);
796         queue->backlog = &queue->list;
797         queue->qlen = 0;
798         queue->max_qlen = max_qlen;
799 }
800 EXPORT_SYMBOL_GPL(crypto_init_queue);
801
802 int crypto_enqueue_request(struct crypto_queue *queue,
803                            struct crypto_async_request *request)
804 {
805         int err = -EINPROGRESS;
806
807         if (unlikely(queue->qlen >= queue->max_qlen)) {
808                 err = -EBUSY;
809                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
810                         goto out;
811                 if (queue->backlog == &queue->list)
812                         queue->backlog = &request->list;
813         }
814
815         queue->qlen++;
816         list_add_tail(&request->list, &queue->list);
817
818 out:
819         return err;
820 }
821 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
822
823 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
824 {
825         struct list_head *request;
826
827         if (unlikely(!queue->qlen))
828                 return NULL;
829
830         queue->qlen--;
831
832         if (queue->backlog != &queue->list)
833                 queue->backlog = queue->backlog->next;
834
835         request = queue->list.next;
836         list_del(request);
837
838         return list_entry(request, struct crypto_async_request, list);
839 }
840 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
841
842 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
843 {
844         struct crypto_async_request *req;
845
846         list_for_each_entry(req, &queue->list, list) {
847                 if (req->tfm == tfm)
848                         return 1;
849         }
850
851         return 0;
852 }
853 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
854
855 static inline void crypto_inc_byte(u8 *a, unsigned int size)
856 {
857         u8 *b = (a + size);
858         u8 c;
859
860         for (; size; size--) {
861                 c = *--b + 1;
862                 *b = c;
863                 if (c)
864                         break;
865         }
866 }
867
868 void crypto_inc(u8 *a, unsigned int size)
869 {
870         __be32 *b = (__be32 *)(a + size);
871         u32 c;
872
873         for (; size >= 4; size -= 4) {
874                 c = be32_to_cpu(*--b) + 1;
875                 *b = cpu_to_be32(c);
876                 if (c)
877                         return;
878         }
879
880         crypto_inc_byte(a, size);
881 }
882 EXPORT_SYMBOL_GPL(crypto_inc);
883
884 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
885 {
886         for (; size; size--)
887                 *a++ ^= *b++;
888 }
889
890 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
891 {
892         u32 *a = (u32 *)dst;
893         u32 *b = (u32 *)src;
894
895         for (; size >= 4; size -= 4)
896                 *a++ ^= *b++;
897
898         crypto_xor_byte((u8 *)a, (u8 *)b, size);
899 }
900 EXPORT_SYMBOL_GPL(crypto_xor);
901
902 static int __init crypto_algapi_init(void)
903 {
904         crypto_init_proc();
905         return 0;
906 }
907
908 static void __exit crypto_algapi_exit(void)
909 {
910         crypto_exit_proc();
911 }
912
913 module_init(crypto_algapi_init);
914 module_exit(crypto_algapi_exit);
915
916 MODULE_LICENSE("GPL");
917 MODULE_DESCRIPTION("Cryptographic algorithms API");