Revert "ARM: tegra: tegratab: dummy change"
[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/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_algs(struct crypto_alg *algs, int count)
409 {
410         int i, ret;
411
412         for (i = 0; i < count; i++) {
413                 ret = crypto_register_alg(&algs[i]);
414                 if (ret)
415                         goto err;
416         }
417
418         return 0;
419
420 err:
421         for (--i; i >= 0; --i)
422                 crypto_unregister_alg(&algs[i]);
423
424         return ret;
425 }
426 EXPORT_SYMBOL_GPL(crypto_register_algs);
427
428 int crypto_unregister_algs(struct crypto_alg *algs, int count)
429 {
430         int i, ret;
431
432         for (i = 0; i < count; i++) {
433                 ret = crypto_unregister_alg(&algs[i]);
434                 if (ret)
435                         pr_err("Failed to unregister %s %s: %d\n",
436                                algs[i].cra_driver_name, algs[i].cra_name, ret);
437         }
438
439         return 0;
440 }
441 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
442
443 int crypto_register_template(struct crypto_template *tmpl)
444 {
445         struct crypto_template *q;
446         int err = -EEXIST;
447
448         down_write(&crypto_alg_sem);
449
450         list_for_each_entry(q, &crypto_template_list, list) {
451                 if (q == tmpl)
452                         goto out;
453         }
454
455         list_add(&tmpl->list, &crypto_template_list);
456         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
457         err = 0;
458 out:
459         up_write(&crypto_alg_sem);
460         return err;
461 }
462 EXPORT_SYMBOL_GPL(crypto_register_template);
463
464 void crypto_unregister_template(struct crypto_template *tmpl)
465 {
466         struct crypto_instance *inst;
467         struct hlist_node *p, *n;
468         struct hlist_head *list;
469         LIST_HEAD(users);
470
471         down_write(&crypto_alg_sem);
472
473         BUG_ON(list_empty(&tmpl->list));
474         list_del_init(&tmpl->list);
475
476         list = &tmpl->instances;
477         hlist_for_each_entry(inst, p, list, list) {
478                 int err = crypto_remove_alg(&inst->alg, &users);
479                 BUG_ON(err);
480         }
481
482         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
483
484         up_write(&crypto_alg_sem);
485
486         hlist_for_each_entry_safe(inst, p, n, list, list) {
487                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
488                 tmpl->free(inst);
489         }
490         crypto_remove_final(&users);
491 }
492 EXPORT_SYMBOL_GPL(crypto_unregister_template);
493
494 static struct crypto_template *__crypto_lookup_template(const char *name)
495 {
496         struct crypto_template *q, *tmpl = NULL;
497
498         down_read(&crypto_alg_sem);
499         list_for_each_entry(q, &crypto_template_list, list) {
500                 if (strcmp(q->name, name))
501                         continue;
502                 if (unlikely(!crypto_tmpl_get(q)))
503                         continue;
504
505                 tmpl = q;
506                 break;
507         }
508         up_read(&crypto_alg_sem);
509
510         return tmpl;
511 }
512
513 struct crypto_template *crypto_lookup_template(const char *name)
514 {
515         return try_then_request_module(__crypto_lookup_template(name), "%s",
516                                        name);
517 }
518 EXPORT_SYMBOL_GPL(crypto_lookup_template);
519
520 int crypto_register_instance(struct crypto_template *tmpl,
521                              struct crypto_instance *inst)
522 {
523         struct crypto_larval *larval;
524         int err;
525
526         err = crypto_check_alg(&inst->alg);
527         if (err)
528                 goto err;
529
530         inst->alg.cra_module = tmpl->module;
531         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
532
533         down_write(&crypto_alg_sem);
534
535         larval = __crypto_register_alg(&inst->alg);
536         if (IS_ERR(larval))
537                 goto unlock;
538
539         hlist_add_head(&inst->list, &tmpl->instances);
540         inst->tmpl = tmpl;
541
542 unlock:
543         up_write(&crypto_alg_sem);
544
545         err = PTR_ERR(larval);
546         if (IS_ERR(larval))
547                 goto err;
548
549         crypto_wait_for_test(larval);
550         err = 0;
551
552 err:
553         return err;
554 }
555 EXPORT_SYMBOL_GPL(crypto_register_instance);
556
557 int crypto_unregister_instance(struct crypto_alg *alg)
558 {
559         int err;
560         struct crypto_instance *inst = (void *)alg;
561         struct crypto_template *tmpl = inst->tmpl;
562         LIST_HEAD(users);
563
564         if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
565                 return -EINVAL;
566
567         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
568
569         down_write(&crypto_alg_sem);
570
571         hlist_del_init(&inst->list);
572         err = crypto_remove_alg(alg, &users);
573
574         up_write(&crypto_alg_sem);
575
576         if (err)
577                 return err;
578
579         tmpl->free(inst);
580         crypto_remove_final(&users);
581
582         return 0;
583 }
584 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
585
586 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
587                       struct crypto_instance *inst, u32 mask)
588 {
589         int err = -EAGAIN;
590
591         spawn->inst = inst;
592         spawn->mask = mask;
593
594         down_write(&crypto_alg_sem);
595         if (!crypto_is_moribund(alg)) {
596                 list_add(&spawn->list, &alg->cra_users);
597                 spawn->alg = alg;
598                 err = 0;
599         }
600         up_write(&crypto_alg_sem);
601
602         return err;
603 }
604 EXPORT_SYMBOL_GPL(crypto_init_spawn);
605
606 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
607                        struct crypto_instance *inst,
608                        const struct crypto_type *frontend)
609 {
610         int err = -EINVAL;
611
612         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
613                 goto out;
614
615         spawn->frontend = frontend;
616         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
617
618 out:
619         return err;
620 }
621 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
622
623 void crypto_drop_spawn(struct crypto_spawn *spawn)
624 {
625         if (!spawn->alg)
626                 return;
627
628         down_write(&crypto_alg_sem);
629         list_del(&spawn->list);
630         up_write(&crypto_alg_sem);
631 }
632 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
633
634 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
635 {
636         struct crypto_alg *alg;
637         struct crypto_alg *alg2;
638
639         down_read(&crypto_alg_sem);
640         alg = spawn->alg;
641         alg2 = alg;
642         if (alg2)
643                 alg2 = crypto_mod_get(alg2);
644         up_read(&crypto_alg_sem);
645
646         if (!alg2) {
647                 if (alg)
648                         crypto_shoot_alg(alg);
649                 return ERR_PTR(-EAGAIN);
650         }
651
652         return alg;
653 }
654
655 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
656                                     u32 mask)
657 {
658         struct crypto_alg *alg;
659         struct crypto_tfm *tfm;
660
661         alg = crypto_spawn_alg(spawn);
662         if (IS_ERR(alg))
663                 return ERR_CAST(alg);
664
665         tfm = ERR_PTR(-EINVAL);
666         if (unlikely((alg->cra_flags ^ type) & mask))
667                 goto out_put_alg;
668
669         tfm = __crypto_alloc_tfm(alg, type, mask);
670         if (IS_ERR(tfm))
671                 goto out_put_alg;
672
673         return tfm;
674
675 out_put_alg:
676         crypto_mod_put(alg);
677         return tfm;
678 }
679 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
680
681 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
682 {
683         struct crypto_alg *alg;
684         struct crypto_tfm *tfm;
685
686         alg = crypto_spawn_alg(spawn);
687         if (IS_ERR(alg))
688                 return ERR_CAST(alg);
689
690         tfm = crypto_create_tfm(alg, spawn->frontend);
691         if (IS_ERR(tfm))
692                 goto out_put_alg;
693
694         return tfm;
695
696 out_put_alg:
697         crypto_mod_put(alg);
698         return tfm;
699 }
700 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
701
702 int crypto_register_notifier(struct notifier_block *nb)
703 {
704         return blocking_notifier_chain_register(&crypto_chain, nb);
705 }
706 EXPORT_SYMBOL_GPL(crypto_register_notifier);
707
708 int crypto_unregister_notifier(struct notifier_block *nb)
709 {
710         return blocking_notifier_chain_unregister(&crypto_chain, nb);
711 }
712 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
713
714 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
715 {
716         struct rtattr *rta = tb[0];
717         struct crypto_attr_type *algt;
718
719         if (!rta)
720                 return ERR_PTR(-ENOENT);
721         if (RTA_PAYLOAD(rta) < sizeof(*algt))
722                 return ERR_PTR(-EINVAL);
723         if (rta->rta_type != CRYPTOA_TYPE)
724                 return ERR_PTR(-EINVAL);
725
726         algt = RTA_DATA(rta);
727
728         return algt;
729 }
730 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
731
732 int crypto_check_attr_type(struct rtattr **tb, u32 type)
733 {
734         struct crypto_attr_type *algt;
735
736         algt = crypto_get_attr_type(tb);
737         if (IS_ERR(algt))
738                 return PTR_ERR(algt);
739
740         if ((algt->type ^ type) & algt->mask)
741                 return -EINVAL;
742
743         return 0;
744 }
745 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
746
747 const char *crypto_attr_alg_name(struct rtattr *rta)
748 {
749         struct crypto_attr_alg *alga;
750
751         if (!rta)
752                 return ERR_PTR(-ENOENT);
753         if (RTA_PAYLOAD(rta) < sizeof(*alga))
754                 return ERR_PTR(-EINVAL);
755         if (rta->rta_type != CRYPTOA_ALG)
756                 return ERR_PTR(-EINVAL);
757
758         alga = RTA_DATA(rta);
759         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
760
761         return alga->name;
762 }
763 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
764
765 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
766                                     const struct crypto_type *frontend,
767                                     u32 type, u32 mask)
768 {
769         const char *name;
770         int err;
771
772         name = crypto_attr_alg_name(rta);
773         err = PTR_ERR(name);
774         if (IS_ERR(name))
775                 return ERR_PTR(err);
776
777         return crypto_find_alg(name, frontend, type, mask);
778 }
779 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
780
781 int crypto_attr_u32(struct rtattr *rta, u32 *num)
782 {
783         struct crypto_attr_u32 *nu32;
784
785         if (!rta)
786                 return -ENOENT;
787         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
788                 return -EINVAL;
789         if (rta->rta_type != CRYPTOA_U32)
790                 return -EINVAL;
791
792         nu32 = RTA_DATA(rta);
793         *num = nu32->num;
794
795         return 0;
796 }
797 EXPORT_SYMBOL_GPL(crypto_attr_u32);
798
799 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
800                              unsigned int head)
801 {
802         struct crypto_instance *inst;
803         char *p;
804         int err;
805
806         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
807                     GFP_KERNEL);
808         if (!p)
809                 return ERR_PTR(-ENOMEM);
810
811         inst = (void *)(p + head);
812
813         err = -ENAMETOOLONG;
814         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
815                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
816                 goto err_free_inst;
817
818         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
819                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
820                 goto err_free_inst;
821
822         return p;
823
824 err_free_inst:
825         kfree(p);
826         return ERR_PTR(err);
827 }
828 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
829
830 struct crypto_instance *crypto_alloc_instance(const char *name,
831                                               struct crypto_alg *alg)
832 {
833         struct crypto_instance *inst;
834         struct crypto_spawn *spawn;
835         int err;
836
837         inst = crypto_alloc_instance2(name, alg, 0);
838         if (IS_ERR(inst))
839                 goto out;
840
841         spawn = crypto_instance_ctx(inst);
842         err = crypto_init_spawn(spawn, alg, inst,
843                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
844
845         if (err)
846                 goto err_free_inst;
847
848         return inst;
849
850 err_free_inst:
851         kfree(inst);
852         inst = ERR_PTR(err);
853
854 out:
855         return inst;
856 }
857 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
858
859 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
860 {
861         INIT_LIST_HEAD(&queue->list);
862         queue->backlog = &queue->list;
863         queue->qlen = 0;
864         queue->max_qlen = max_qlen;
865 }
866 EXPORT_SYMBOL_GPL(crypto_init_queue);
867
868 int crypto_enqueue_request(struct crypto_queue *queue,
869                            struct crypto_async_request *request)
870 {
871         int err = -EINPROGRESS;
872
873         if (unlikely(queue->qlen >= queue->max_qlen)) {
874                 err = -EBUSY;
875                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
876                         goto out;
877                 if (queue->backlog == &queue->list)
878                         queue->backlog = &request->list;
879         }
880
881         queue->qlen++;
882         list_add_tail(&request->list, &queue->list);
883
884 out:
885         return err;
886 }
887 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
888
889 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
890 {
891         struct list_head *request;
892
893         if (unlikely(!queue->qlen))
894                 return NULL;
895
896         queue->qlen--;
897
898         if (queue->backlog != &queue->list)
899                 queue->backlog = queue->backlog->next;
900
901         request = queue->list.next;
902         list_del(request);
903
904         return (char *)list_entry(request, struct crypto_async_request, list) -
905                offset;
906 }
907 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
908
909 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
910 {
911         return __crypto_dequeue_request(queue, 0);
912 }
913 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
914
915 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
916 {
917         struct crypto_async_request *req;
918
919         list_for_each_entry(req, &queue->list, list) {
920                 if (req->tfm == tfm)
921                         return 1;
922         }
923
924         return 0;
925 }
926 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
927
928 static inline void crypto_inc_byte(u8 *a, unsigned int size)
929 {
930         u8 *b = (a + size);
931         u8 c;
932
933         for (; size; size--) {
934                 c = *--b + 1;
935                 *b = c;
936                 if (c)
937                         break;
938         }
939 }
940
941 void crypto_inc(u8 *a, unsigned int size)
942 {
943         __be32 *b = (__be32 *)(a + size);
944         u32 c;
945
946         for (; size >= 4; size -= 4) {
947                 c = be32_to_cpu(*--b) + 1;
948                 *b = cpu_to_be32(c);
949                 if (c)
950                         return;
951         }
952
953         crypto_inc_byte(a, size);
954 }
955 EXPORT_SYMBOL_GPL(crypto_inc);
956
957 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
958 {
959         for (; size; size--)
960                 *a++ ^= *b++;
961 }
962
963 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
964 {
965         u32 *a = (u32 *)dst;
966         u32 *b = (u32 *)src;
967
968         for (; size >= 4; size -= 4)
969                 *a++ ^= *b++;
970
971         crypto_xor_byte((u8 *)a, (u8 *)b, size);
972 }
973 EXPORT_SYMBOL_GPL(crypto_xor);
974
975 static int __init crypto_algapi_init(void)
976 {
977         crypto_init_proc();
978         return 0;
979 }
980
981 static void __exit crypto_algapi_exit(void)
982 {
983         crypto_exit_proc();
984 }
985
986 module_init(crypto_algapi_init);
987 module_exit(crypto_algapi_exit);
988
989 MODULE_LICENSE("GPL");
990 MODULE_DESCRIPTION("Cryptographic algorithms API");