Merge tag 'pinctrl-for-3.7-late' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-3.10.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 static inline int crypto_set_driver_name(struct crypto_alg *alg)
28 {
29         static const char suffix[] = "-generic";
30         char *driver_name = alg->cra_driver_name;
31         int len;
32
33         if (*driver_name)
34                 return 0;
35
36         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
37         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
38                 return -ENAMETOOLONG;
39
40         memcpy(driver_name + len, suffix, sizeof(suffix));
41         return 0;
42 }
43
44 static int crypto_check_alg(struct crypto_alg *alg)
45 {
46         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
47                 return -EINVAL;
48
49         if (alg->cra_blocksize > PAGE_SIZE / 8)
50                 return -EINVAL;
51
52         if (alg->cra_priority < 0)
53                 return -EINVAL;
54
55         return crypto_set_driver_name(alg);
56 }
57
58 static void crypto_destroy_instance(struct crypto_alg *alg)
59 {
60         struct crypto_instance *inst = (void *)alg;
61         struct crypto_template *tmpl = inst->tmpl;
62
63         tmpl->free(inst);
64         crypto_tmpl_put(tmpl);
65 }
66
67 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
68                                             struct list_head *stack,
69                                             struct list_head *top,
70                                             struct list_head *secondary_spawns)
71 {
72         struct crypto_spawn *spawn, *n;
73
74         if (list_empty(stack))
75                 return NULL;
76
77         spawn = list_first_entry(stack, struct crypto_spawn, list);
78         n = list_entry(spawn->list.next, struct crypto_spawn, list);
79
80         if (spawn->alg && &n->list != stack && !n->alg)
81                 n->alg = (n->list.next == stack) ? alg :
82                          &list_entry(n->list.next, struct crypto_spawn,
83                                      list)->inst->alg;
84
85         list_move(&spawn->list, secondary_spawns);
86
87         return &n->list == stack ? top : &n->inst->alg.cra_users;
88 }
89
90 static void crypto_remove_spawn(struct crypto_spawn *spawn,
91                                 struct list_head *list)
92 {
93         struct crypto_instance *inst = spawn->inst;
94         struct crypto_template *tmpl = inst->tmpl;
95
96         if (crypto_is_dead(&inst->alg))
97                 return;
98
99         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
100         if (hlist_unhashed(&inst->list))
101                 return;
102
103         if (!tmpl || !crypto_tmpl_get(tmpl))
104                 return;
105
106         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
107         list_move(&inst->alg.cra_list, list);
108         hlist_del(&inst->list);
109         inst->alg.cra_destroy = crypto_destroy_instance;
110
111         BUG_ON(!list_empty(&inst->alg.cra_users));
112 }
113
114 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
115                           struct crypto_alg *nalg)
116 {
117         u32 new_type = (nalg ?: alg)->cra_flags;
118         struct crypto_spawn *spawn, *n;
119         LIST_HEAD(secondary_spawns);
120         struct list_head *spawns;
121         LIST_HEAD(stack);
122         LIST_HEAD(top);
123
124         spawns = &alg->cra_users;
125         list_for_each_entry_safe(spawn, n, spawns, list) {
126                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
127                         continue;
128
129                 list_move(&spawn->list, &top);
130         }
131
132         spawns = &top;
133         do {
134                 while (!list_empty(spawns)) {
135                         struct crypto_instance *inst;
136
137                         spawn = list_first_entry(spawns, struct crypto_spawn,
138                                                  list);
139                         inst = spawn->inst;
140
141                         BUG_ON(&inst->alg == alg);
142
143                         list_move(&spawn->list, &stack);
144
145                         if (&inst->alg == nalg)
146                                 break;
147
148                         spawn->alg = NULL;
149                         spawns = &inst->alg.cra_users;
150                 }
151         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
152                                               &secondary_spawns)));
153
154         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
155                 if (spawn->alg)
156                         list_move(&spawn->list, &spawn->alg->cra_users);
157                 else
158                         crypto_remove_spawn(spawn, list);
159         }
160 }
161 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
162
163 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
164 {
165         struct crypto_alg *q;
166         struct crypto_larval *larval;
167         int ret = -EAGAIN;
168
169         if (crypto_is_dead(alg))
170                 goto err;
171
172         INIT_LIST_HEAD(&alg->cra_users);
173
174         /* No cheating! */
175         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
176
177         ret = -EEXIST;
178
179         atomic_set(&alg->cra_refcnt, 1);
180         list_for_each_entry(q, &crypto_alg_list, cra_list) {
181                 if (q == alg)
182                         goto err;
183
184                 if (crypto_is_moribund(q))
185                         continue;
186
187                 if (crypto_is_larval(q)) {
188                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
189                                 goto err;
190                         continue;
191                 }
192
193                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
194                     !strcmp(q->cra_name, alg->cra_driver_name))
195                         goto err;
196         }
197
198         larval = crypto_larval_alloc(alg->cra_name,
199                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
200         if (IS_ERR(larval))
201                 goto out;
202
203         ret = -ENOENT;
204         larval->adult = crypto_mod_get(alg);
205         if (!larval->adult)
206                 goto free_larval;
207
208         atomic_set(&larval->alg.cra_refcnt, 1);
209         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
210                CRYPTO_MAX_ALG_NAME);
211         larval->alg.cra_priority = alg->cra_priority;
212
213         list_add(&alg->cra_list, &crypto_alg_list);
214         list_add(&larval->alg.cra_list, &crypto_alg_list);
215
216 out:
217         return larval;
218
219 free_larval:
220         kfree(larval);
221 err:
222         larval = ERR_PTR(ret);
223         goto out;
224 }
225
226 void crypto_alg_tested(const char *name, int err)
227 {
228         struct crypto_larval *test;
229         struct crypto_alg *alg;
230         struct crypto_alg *q;
231         LIST_HEAD(list);
232
233         down_write(&crypto_alg_sem);
234         list_for_each_entry(q, &crypto_alg_list, cra_list) {
235                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
236                         continue;
237
238                 test = (struct crypto_larval *)q;
239
240                 if (!strcmp(q->cra_driver_name, name))
241                         goto found;
242         }
243
244         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
245         goto unlock;
246
247 found:
248         q->cra_flags |= CRYPTO_ALG_DEAD;
249         alg = test->adult;
250         if (err || list_empty(&alg->cra_list))
251                 goto complete;
252
253         alg->cra_flags |= CRYPTO_ALG_TESTED;
254
255         list_for_each_entry(q, &crypto_alg_list, cra_list) {
256                 if (q == alg)
257                         continue;
258
259                 if (crypto_is_moribund(q))
260                         continue;
261
262                 if (crypto_is_larval(q)) {
263                         struct crypto_larval *larval = (void *)q;
264
265                         /*
266                          * Check to see if either our generic name or
267                          * specific name can satisfy the name requested
268                          * by the larval entry q.
269                          */
270                         if (strcmp(alg->cra_name, q->cra_name) &&
271                             strcmp(alg->cra_driver_name, q->cra_name))
272                                 continue;
273
274                         if (larval->adult)
275                                 continue;
276                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
277                                 continue;
278                         if (!crypto_mod_get(alg))
279                                 continue;
280
281                         larval->adult = alg;
282                         continue;
283                 }
284
285                 if (strcmp(alg->cra_name, q->cra_name))
286                         continue;
287
288                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
289                     q->cra_priority > alg->cra_priority)
290                         continue;
291
292                 crypto_remove_spawns(q, &list, alg);
293         }
294
295 complete:
296         complete_all(&test->completion);
297
298 unlock:
299         up_write(&crypto_alg_sem);
300
301         crypto_remove_final(&list);
302 }
303 EXPORT_SYMBOL_GPL(crypto_alg_tested);
304
305 void crypto_remove_final(struct list_head *list)
306 {
307         struct crypto_alg *alg;
308         struct crypto_alg *n;
309
310         list_for_each_entry_safe(alg, n, list, cra_list) {
311                 list_del_init(&alg->cra_list);
312                 crypto_alg_put(alg);
313         }
314 }
315 EXPORT_SYMBOL_GPL(crypto_remove_final);
316
317 static void crypto_wait_for_test(struct crypto_larval *larval)
318 {
319         int err;
320
321         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
322         if (err != NOTIFY_STOP) {
323                 if (WARN_ON(err != NOTIFY_DONE))
324                         goto out;
325                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
326         }
327
328         err = wait_for_completion_interruptible(&larval->completion);
329         WARN_ON(err);
330
331 out:
332         crypto_larval_kill(&larval->alg);
333 }
334
335 int crypto_register_alg(struct crypto_alg *alg)
336 {
337         struct crypto_larval *larval;
338         int err;
339
340         err = crypto_check_alg(alg);
341         if (err)
342                 return err;
343
344         down_write(&crypto_alg_sem);
345         larval = __crypto_register_alg(alg);
346         up_write(&crypto_alg_sem);
347
348         if (IS_ERR(larval))
349                 return PTR_ERR(larval);
350
351         crypto_wait_for_test(larval);
352         return 0;
353 }
354 EXPORT_SYMBOL_GPL(crypto_register_alg);
355
356 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
357 {
358         if (unlikely(list_empty(&alg->cra_list)))
359                 return -ENOENT;
360
361         alg->cra_flags |= CRYPTO_ALG_DEAD;
362
363         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
364         list_del_init(&alg->cra_list);
365         crypto_remove_spawns(alg, list, NULL);
366
367         return 0;
368 }
369
370 int crypto_unregister_alg(struct crypto_alg *alg)
371 {
372         int ret;
373         LIST_HEAD(list);
374
375         down_write(&crypto_alg_sem);
376         ret = crypto_remove_alg(alg, &list);
377         up_write(&crypto_alg_sem);
378
379         if (ret)
380                 return ret;
381
382         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
383         if (alg->cra_destroy)
384                 alg->cra_destroy(alg);
385
386         crypto_remove_final(&list);
387         return 0;
388 }
389 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
390
391 int crypto_register_algs(struct crypto_alg *algs, int count)
392 {
393         int i, ret;
394
395         for (i = 0; i < count; i++) {
396                 ret = crypto_register_alg(&algs[i]);
397                 if (ret)
398                         goto err;
399         }
400
401         return 0;
402
403 err:
404         for (--i; i >= 0; --i)
405                 crypto_unregister_alg(&algs[i]);
406
407         return ret;
408 }
409 EXPORT_SYMBOL_GPL(crypto_register_algs);
410
411 int crypto_unregister_algs(struct crypto_alg *algs, int count)
412 {
413         int i, ret;
414
415         for (i = 0; i < count; i++) {
416                 ret = crypto_unregister_alg(&algs[i]);
417                 if (ret)
418                         pr_err("Failed to unregister %s %s: %d\n",
419                                algs[i].cra_driver_name, algs[i].cra_name, ret);
420         }
421
422         return 0;
423 }
424 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
425
426 int crypto_register_template(struct crypto_template *tmpl)
427 {
428         struct crypto_template *q;
429         int err = -EEXIST;
430
431         down_write(&crypto_alg_sem);
432
433         list_for_each_entry(q, &crypto_template_list, list) {
434                 if (q == tmpl)
435                         goto out;
436         }
437
438         list_add(&tmpl->list, &crypto_template_list);
439         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
440         err = 0;
441 out:
442         up_write(&crypto_alg_sem);
443         return err;
444 }
445 EXPORT_SYMBOL_GPL(crypto_register_template);
446
447 void crypto_unregister_template(struct crypto_template *tmpl)
448 {
449         struct crypto_instance *inst;
450         struct hlist_node *p, *n;
451         struct hlist_head *list;
452         LIST_HEAD(users);
453
454         down_write(&crypto_alg_sem);
455
456         BUG_ON(list_empty(&tmpl->list));
457         list_del_init(&tmpl->list);
458
459         list = &tmpl->instances;
460         hlist_for_each_entry(inst, p, list, list) {
461                 int err = crypto_remove_alg(&inst->alg, &users);
462                 BUG_ON(err);
463         }
464
465         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
466
467         up_write(&crypto_alg_sem);
468
469         hlist_for_each_entry_safe(inst, p, n, list, list) {
470                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
471                 tmpl->free(inst);
472         }
473         crypto_remove_final(&users);
474 }
475 EXPORT_SYMBOL_GPL(crypto_unregister_template);
476
477 static struct crypto_template *__crypto_lookup_template(const char *name)
478 {
479         struct crypto_template *q, *tmpl = NULL;
480
481         down_read(&crypto_alg_sem);
482         list_for_each_entry(q, &crypto_template_list, list) {
483                 if (strcmp(q->name, name))
484                         continue;
485                 if (unlikely(!crypto_tmpl_get(q)))
486                         continue;
487
488                 tmpl = q;
489                 break;
490         }
491         up_read(&crypto_alg_sem);
492
493         return tmpl;
494 }
495
496 struct crypto_template *crypto_lookup_template(const char *name)
497 {
498         return try_then_request_module(__crypto_lookup_template(name), name);
499 }
500 EXPORT_SYMBOL_GPL(crypto_lookup_template);
501
502 int crypto_register_instance(struct crypto_template *tmpl,
503                              struct crypto_instance *inst)
504 {
505         struct crypto_larval *larval;
506         int err;
507
508         err = crypto_check_alg(&inst->alg);
509         if (err)
510                 goto err;
511
512         inst->alg.cra_module = tmpl->module;
513         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
514
515         down_write(&crypto_alg_sem);
516
517         larval = __crypto_register_alg(&inst->alg);
518         if (IS_ERR(larval))
519                 goto unlock;
520
521         hlist_add_head(&inst->list, &tmpl->instances);
522         inst->tmpl = tmpl;
523
524 unlock:
525         up_write(&crypto_alg_sem);
526
527         err = PTR_ERR(larval);
528         if (IS_ERR(larval))
529                 goto err;
530
531         crypto_wait_for_test(larval);
532         err = 0;
533
534 err:
535         return err;
536 }
537 EXPORT_SYMBOL_GPL(crypto_register_instance);
538
539 int crypto_unregister_instance(struct crypto_alg *alg)
540 {
541         int err;
542         struct crypto_instance *inst = (void *)alg;
543         struct crypto_template *tmpl = inst->tmpl;
544         LIST_HEAD(users);
545
546         if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
547                 return -EINVAL;
548
549         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
550
551         down_write(&crypto_alg_sem);
552
553         hlist_del_init(&inst->list);
554         err = crypto_remove_alg(alg, &users);
555
556         up_write(&crypto_alg_sem);
557
558         if (err)
559                 return err;
560
561         tmpl->free(inst);
562         crypto_remove_final(&users);
563
564         return 0;
565 }
566 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
567
568 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
569                       struct crypto_instance *inst, u32 mask)
570 {
571         int err = -EAGAIN;
572
573         spawn->inst = inst;
574         spawn->mask = mask;
575
576         down_write(&crypto_alg_sem);
577         if (!crypto_is_moribund(alg)) {
578                 list_add(&spawn->list, &alg->cra_users);
579                 spawn->alg = alg;
580                 err = 0;
581         }
582         up_write(&crypto_alg_sem);
583
584         return err;
585 }
586 EXPORT_SYMBOL_GPL(crypto_init_spawn);
587
588 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
589                        struct crypto_instance *inst,
590                        const struct crypto_type *frontend)
591 {
592         int err = -EINVAL;
593
594         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
595                 goto out;
596
597         spawn->frontend = frontend;
598         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
599
600 out:
601         return err;
602 }
603 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
604
605 void crypto_drop_spawn(struct crypto_spawn *spawn)
606 {
607         if (!spawn->alg)
608                 return;
609
610         down_write(&crypto_alg_sem);
611         list_del(&spawn->list);
612         up_write(&crypto_alg_sem);
613 }
614 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
615
616 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
617 {
618         struct crypto_alg *alg;
619         struct crypto_alg *alg2;
620
621         down_read(&crypto_alg_sem);
622         alg = spawn->alg;
623         alg2 = alg;
624         if (alg2)
625                 alg2 = crypto_mod_get(alg2);
626         up_read(&crypto_alg_sem);
627
628         if (!alg2) {
629                 if (alg)
630                         crypto_shoot_alg(alg);
631                 return ERR_PTR(-EAGAIN);
632         }
633
634         return alg;
635 }
636
637 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
638                                     u32 mask)
639 {
640         struct crypto_alg *alg;
641         struct crypto_tfm *tfm;
642
643         alg = crypto_spawn_alg(spawn);
644         if (IS_ERR(alg))
645                 return ERR_CAST(alg);
646
647         tfm = ERR_PTR(-EINVAL);
648         if (unlikely((alg->cra_flags ^ type) & mask))
649                 goto out_put_alg;
650
651         tfm = __crypto_alloc_tfm(alg, type, mask);
652         if (IS_ERR(tfm))
653                 goto out_put_alg;
654
655         return tfm;
656
657 out_put_alg:
658         crypto_mod_put(alg);
659         return tfm;
660 }
661 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
662
663 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
664 {
665         struct crypto_alg *alg;
666         struct crypto_tfm *tfm;
667
668         alg = crypto_spawn_alg(spawn);
669         if (IS_ERR(alg))
670                 return ERR_CAST(alg);
671
672         tfm = crypto_create_tfm(alg, spawn->frontend);
673         if (IS_ERR(tfm))
674                 goto out_put_alg;
675
676         return tfm;
677
678 out_put_alg:
679         crypto_mod_put(alg);
680         return tfm;
681 }
682 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
683
684 int crypto_register_notifier(struct notifier_block *nb)
685 {
686         return blocking_notifier_chain_register(&crypto_chain, nb);
687 }
688 EXPORT_SYMBOL_GPL(crypto_register_notifier);
689
690 int crypto_unregister_notifier(struct notifier_block *nb)
691 {
692         return blocking_notifier_chain_unregister(&crypto_chain, nb);
693 }
694 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
695
696 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
697 {
698         struct rtattr *rta = tb[0];
699         struct crypto_attr_type *algt;
700
701         if (!rta)
702                 return ERR_PTR(-ENOENT);
703         if (RTA_PAYLOAD(rta) < sizeof(*algt))
704                 return ERR_PTR(-EINVAL);
705         if (rta->rta_type != CRYPTOA_TYPE)
706                 return ERR_PTR(-EINVAL);
707
708         algt = RTA_DATA(rta);
709
710         return algt;
711 }
712 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
713
714 int crypto_check_attr_type(struct rtattr **tb, u32 type)
715 {
716         struct crypto_attr_type *algt;
717
718         algt = crypto_get_attr_type(tb);
719         if (IS_ERR(algt))
720                 return PTR_ERR(algt);
721
722         if ((algt->type ^ type) & algt->mask)
723                 return -EINVAL;
724
725         return 0;
726 }
727 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
728
729 const char *crypto_attr_alg_name(struct rtattr *rta)
730 {
731         struct crypto_attr_alg *alga;
732
733         if (!rta)
734                 return ERR_PTR(-ENOENT);
735         if (RTA_PAYLOAD(rta) < sizeof(*alga))
736                 return ERR_PTR(-EINVAL);
737         if (rta->rta_type != CRYPTOA_ALG)
738                 return ERR_PTR(-EINVAL);
739
740         alga = RTA_DATA(rta);
741         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
742
743         return alga->name;
744 }
745 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
746
747 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
748                                     const struct crypto_type *frontend,
749                                     u32 type, u32 mask)
750 {
751         const char *name;
752         int err;
753
754         name = crypto_attr_alg_name(rta);
755         err = PTR_ERR(name);
756         if (IS_ERR(name))
757                 return ERR_PTR(err);
758
759         return crypto_find_alg(name, frontend, type, mask);
760 }
761 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
762
763 int crypto_attr_u32(struct rtattr *rta, u32 *num)
764 {
765         struct crypto_attr_u32 *nu32;
766
767         if (!rta)
768                 return -ENOENT;
769         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
770                 return -EINVAL;
771         if (rta->rta_type != CRYPTOA_U32)
772                 return -EINVAL;
773
774         nu32 = RTA_DATA(rta);
775         *num = nu32->num;
776
777         return 0;
778 }
779 EXPORT_SYMBOL_GPL(crypto_attr_u32);
780
781 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
782                              unsigned int head)
783 {
784         struct crypto_instance *inst;
785         char *p;
786         int err;
787
788         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
789                     GFP_KERNEL);
790         if (!p)
791                 return ERR_PTR(-ENOMEM);
792
793         inst = (void *)(p + head);
794
795         err = -ENAMETOOLONG;
796         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
797                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
798                 goto err_free_inst;
799
800         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
801                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
802                 goto err_free_inst;
803
804         return p;
805
806 err_free_inst:
807         kfree(p);
808         return ERR_PTR(err);
809 }
810 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
811
812 struct crypto_instance *crypto_alloc_instance(const char *name,
813                                               struct crypto_alg *alg)
814 {
815         struct crypto_instance *inst;
816         struct crypto_spawn *spawn;
817         int err;
818
819         inst = crypto_alloc_instance2(name, alg, 0);
820         if (IS_ERR(inst))
821                 goto out;
822
823         spawn = crypto_instance_ctx(inst);
824         err = crypto_init_spawn(spawn, alg, inst,
825                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
826
827         if (err)
828                 goto err_free_inst;
829
830         return inst;
831
832 err_free_inst:
833         kfree(inst);
834         inst = ERR_PTR(err);
835
836 out:
837         return inst;
838 }
839 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
840
841 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
842 {
843         INIT_LIST_HEAD(&queue->list);
844         queue->backlog = &queue->list;
845         queue->qlen = 0;
846         queue->max_qlen = max_qlen;
847 }
848 EXPORT_SYMBOL_GPL(crypto_init_queue);
849
850 int crypto_enqueue_request(struct crypto_queue *queue,
851                            struct crypto_async_request *request)
852 {
853         int err = -EINPROGRESS;
854
855         if (unlikely(queue->qlen >= queue->max_qlen)) {
856                 err = -EBUSY;
857                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
858                         goto out;
859                 if (queue->backlog == &queue->list)
860                         queue->backlog = &request->list;
861         }
862
863         queue->qlen++;
864         list_add_tail(&request->list, &queue->list);
865
866 out:
867         return err;
868 }
869 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
870
871 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
872 {
873         struct list_head *request;
874
875         if (unlikely(!queue->qlen))
876                 return NULL;
877
878         queue->qlen--;
879
880         if (queue->backlog != &queue->list)
881                 queue->backlog = queue->backlog->next;
882
883         request = queue->list.next;
884         list_del(request);
885
886         return (char *)list_entry(request, struct crypto_async_request, list) -
887                offset;
888 }
889 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
890
891 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
892 {
893         return __crypto_dequeue_request(queue, 0);
894 }
895 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
896
897 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
898 {
899         struct crypto_async_request *req;
900
901         list_for_each_entry(req, &queue->list, list) {
902                 if (req->tfm == tfm)
903                         return 1;
904         }
905
906         return 0;
907 }
908 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
909
910 static inline void crypto_inc_byte(u8 *a, unsigned int size)
911 {
912         u8 *b = (a + size);
913         u8 c;
914
915         for (; size; size--) {
916                 c = *--b + 1;
917                 *b = c;
918                 if (c)
919                         break;
920         }
921 }
922
923 void crypto_inc(u8 *a, unsigned int size)
924 {
925         __be32 *b = (__be32 *)(a + size);
926         u32 c;
927
928         for (; size >= 4; size -= 4) {
929                 c = be32_to_cpu(*--b) + 1;
930                 *b = cpu_to_be32(c);
931                 if (c)
932                         return;
933         }
934
935         crypto_inc_byte(a, size);
936 }
937 EXPORT_SYMBOL_GPL(crypto_inc);
938
939 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
940 {
941         for (; size; size--)
942                 *a++ ^= *b++;
943 }
944
945 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
946 {
947         u32 *a = (u32 *)dst;
948         u32 *b = (u32 *)src;
949
950         for (; size >= 4; size -= 4)
951                 *a++ ^= *b++;
952
953         crypto_xor_byte((u8 *)a, (u8 *)b, size);
954 }
955 EXPORT_SYMBOL_GPL(crypto_xor);
956
957 static int __init crypto_algapi_init(void)
958 {
959         crypto_init_proc();
960         return 0;
961 }
962
963 static void __exit crypto_algapi_exit(void)
964 {
965         crypto_exit_proc();
966 }
967
968 module_init(crypto_algapi_init);
969 module_exit(crypto_algapi_exit);
970
971 MODULE_LICENSE("GPL");
972 MODULE_DESCRIPTION("Cryptographic algorithms API");