crypto: tcrypt - add lrw(twofish) tests
[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 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), 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         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
496
497         down_write(&crypto_alg_sem);
498
499         larval = __crypto_register_alg(&inst->alg);
500         if (IS_ERR(larval))
501                 goto unlock;
502
503         hlist_add_head(&inst->list, &tmpl->instances);
504         inst->tmpl = tmpl;
505
506 unlock:
507         up_write(&crypto_alg_sem);
508
509         err = PTR_ERR(larval);
510         if (IS_ERR(larval))
511                 goto err;
512
513         crypto_wait_for_test(larval);
514         err = 0;
515
516 err:
517         return err;
518 }
519 EXPORT_SYMBOL_GPL(crypto_register_instance);
520
521 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
522                       struct crypto_instance *inst, u32 mask)
523 {
524         int err = -EAGAIN;
525
526         spawn->inst = inst;
527         spawn->mask = mask;
528
529         down_write(&crypto_alg_sem);
530         if (!crypto_is_moribund(alg)) {
531                 list_add(&spawn->list, &alg->cra_users);
532                 spawn->alg = alg;
533                 err = 0;
534         }
535         up_write(&crypto_alg_sem);
536
537         return err;
538 }
539 EXPORT_SYMBOL_GPL(crypto_init_spawn);
540
541 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
542                        struct crypto_instance *inst,
543                        const struct crypto_type *frontend)
544 {
545         int err = -EINVAL;
546
547         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
548                 goto out;
549
550         spawn->frontend = frontend;
551         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
552
553 out:
554         return err;
555 }
556 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
557
558 void crypto_drop_spawn(struct crypto_spawn *spawn)
559 {
560         if (!spawn->alg)
561                 return;
562
563         down_write(&crypto_alg_sem);
564         list_del(&spawn->list);
565         up_write(&crypto_alg_sem);
566 }
567 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
568
569 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
570 {
571         struct crypto_alg *alg;
572         struct crypto_alg *alg2;
573
574         down_read(&crypto_alg_sem);
575         alg = spawn->alg;
576         alg2 = alg;
577         if (alg2)
578                 alg2 = crypto_mod_get(alg2);
579         up_read(&crypto_alg_sem);
580
581         if (!alg2) {
582                 if (alg)
583                         crypto_shoot_alg(alg);
584                 return ERR_PTR(-EAGAIN);
585         }
586
587         return alg;
588 }
589
590 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
591                                     u32 mask)
592 {
593         struct crypto_alg *alg;
594         struct crypto_tfm *tfm;
595
596         alg = crypto_spawn_alg(spawn);
597         if (IS_ERR(alg))
598                 return ERR_CAST(alg);
599
600         tfm = ERR_PTR(-EINVAL);
601         if (unlikely((alg->cra_flags ^ type) & mask))
602                 goto out_put_alg;
603
604         tfm = __crypto_alloc_tfm(alg, type, mask);
605         if (IS_ERR(tfm))
606                 goto out_put_alg;
607
608         return tfm;
609
610 out_put_alg:
611         crypto_mod_put(alg);
612         return tfm;
613 }
614 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
615
616 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
617 {
618         struct crypto_alg *alg;
619         struct crypto_tfm *tfm;
620
621         alg = crypto_spawn_alg(spawn);
622         if (IS_ERR(alg))
623                 return ERR_CAST(alg);
624
625         tfm = crypto_create_tfm(alg, spawn->frontend);
626         if (IS_ERR(tfm))
627                 goto out_put_alg;
628
629         return tfm;
630
631 out_put_alg:
632         crypto_mod_put(alg);
633         return tfm;
634 }
635 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
636
637 int crypto_register_notifier(struct notifier_block *nb)
638 {
639         return blocking_notifier_chain_register(&crypto_chain, nb);
640 }
641 EXPORT_SYMBOL_GPL(crypto_register_notifier);
642
643 int crypto_unregister_notifier(struct notifier_block *nb)
644 {
645         return blocking_notifier_chain_unregister(&crypto_chain, nb);
646 }
647 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
648
649 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
650 {
651         struct rtattr *rta = tb[0];
652         struct crypto_attr_type *algt;
653
654         if (!rta)
655                 return ERR_PTR(-ENOENT);
656         if (RTA_PAYLOAD(rta) < sizeof(*algt))
657                 return ERR_PTR(-EINVAL);
658         if (rta->rta_type != CRYPTOA_TYPE)
659                 return ERR_PTR(-EINVAL);
660
661         algt = RTA_DATA(rta);
662
663         return algt;
664 }
665 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
666
667 int crypto_check_attr_type(struct rtattr **tb, u32 type)
668 {
669         struct crypto_attr_type *algt;
670
671         algt = crypto_get_attr_type(tb);
672         if (IS_ERR(algt))
673                 return PTR_ERR(algt);
674
675         if ((algt->type ^ type) & algt->mask)
676                 return -EINVAL;
677
678         return 0;
679 }
680 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
681
682 const char *crypto_attr_alg_name(struct rtattr *rta)
683 {
684         struct crypto_attr_alg *alga;
685
686         if (!rta)
687                 return ERR_PTR(-ENOENT);
688         if (RTA_PAYLOAD(rta) < sizeof(*alga))
689                 return ERR_PTR(-EINVAL);
690         if (rta->rta_type != CRYPTOA_ALG)
691                 return ERR_PTR(-EINVAL);
692
693         alga = RTA_DATA(rta);
694         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
695
696         return alga->name;
697 }
698 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
699
700 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
701                                     const struct crypto_type *frontend,
702                                     u32 type, u32 mask)
703 {
704         const char *name;
705         int err;
706
707         name = crypto_attr_alg_name(rta);
708         err = PTR_ERR(name);
709         if (IS_ERR(name))
710                 return ERR_PTR(err);
711
712         return crypto_find_alg(name, frontend, type, mask);
713 }
714 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
715
716 int crypto_attr_u32(struct rtattr *rta, u32 *num)
717 {
718         struct crypto_attr_u32 *nu32;
719
720         if (!rta)
721                 return -ENOENT;
722         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
723                 return -EINVAL;
724         if (rta->rta_type != CRYPTOA_U32)
725                 return -EINVAL;
726
727         nu32 = RTA_DATA(rta);
728         *num = nu32->num;
729
730         return 0;
731 }
732 EXPORT_SYMBOL_GPL(crypto_attr_u32);
733
734 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
735                              unsigned int head)
736 {
737         struct crypto_instance *inst;
738         char *p;
739         int err;
740
741         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
742                     GFP_KERNEL);
743         if (!p)
744                 return ERR_PTR(-ENOMEM);
745
746         inst = (void *)(p + head);
747
748         err = -ENAMETOOLONG;
749         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
750                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
751                 goto err_free_inst;
752
753         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
754                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
755                 goto err_free_inst;
756
757         return p;
758
759 err_free_inst:
760         kfree(p);
761         return ERR_PTR(err);
762 }
763 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
764
765 struct crypto_instance *crypto_alloc_instance(const char *name,
766                                               struct crypto_alg *alg)
767 {
768         struct crypto_instance *inst;
769         struct crypto_spawn *spawn;
770         int err;
771
772         inst = crypto_alloc_instance2(name, alg, 0);
773         if (IS_ERR(inst))
774                 goto out;
775
776         spawn = crypto_instance_ctx(inst);
777         err = crypto_init_spawn(spawn, alg, inst,
778                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
779
780         if (err)
781                 goto err_free_inst;
782
783         return inst;
784
785 err_free_inst:
786         kfree(inst);
787         inst = ERR_PTR(err);
788
789 out:
790         return inst;
791 }
792 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
793
794 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
795 {
796         INIT_LIST_HEAD(&queue->list);
797         queue->backlog = &queue->list;
798         queue->qlen = 0;
799         queue->max_qlen = max_qlen;
800 }
801 EXPORT_SYMBOL_GPL(crypto_init_queue);
802
803 int crypto_enqueue_request(struct crypto_queue *queue,
804                            struct crypto_async_request *request)
805 {
806         int err = -EINPROGRESS;
807
808         if (unlikely(queue->qlen >= queue->max_qlen)) {
809                 err = -EBUSY;
810                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
811                         goto out;
812                 if (queue->backlog == &queue->list)
813                         queue->backlog = &request->list;
814         }
815
816         queue->qlen++;
817         list_add_tail(&request->list, &queue->list);
818
819 out:
820         return err;
821 }
822 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
823
824 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
825 {
826         struct list_head *request;
827
828         if (unlikely(!queue->qlen))
829                 return NULL;
830
831         queue->qlen--;
832
833         if (queue->backlog != &queue->list)
834                 queue->backlog = queue->backlog->next;
835
836         request = queue->list.next;
837         list_del(request);
838
839         return (char *)list_entry(request, struct crypto_async_request, list) -
840                offset;
841 }
842 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
843
844 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
845 {
846         return __crypto_dequeue_request(queue, 0);
847 }
848 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
849
850 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
851 {
852         struct crypto_async_request *req;
853
854         list_for_each_entry(req, &queue->list, list) {
855                 if (req->tfm == tfm)
856                         return 1;
857         }
858
859         return 0;
860 }
861 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
862
863 static inline void crypto_inc_byte(u8 *a, unsigned int size)
864 {
865         u8 *b = (a + size);
866         u8 c;
867
868         for (; size; size--) {
869                 c = *--b + 1;
870                 *b = c;
871                 if (c)
872                         break;
873         }
874 }
875
876 void crypto_inc(u8 *a, unsigned int size)
877 {
878         __be32 *b = (__be32 *)(a + size);
879         u32 c;
880
881         for (; size >= 4; size -= 4) {
882                 c = be32_to_cpu(*--b) + 1;
883                 *b = cpu_to_be32(c);
884                 if (c)
885                         return;
886         }
887
888         crypto_inc_byte(a, size);
889 }
890 EXPORT_SYMBOL_GPL(crypto_inc);
891
892 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
893 {
894         for (; size; size--)
895                 *a++ ^= *b++;
896 }
897
898 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
899 {
900         u32 *a = (u32 *)dst;
901         u32 *b = (u32 *)src;
902
903         for (; size >= 4; size -= 4)
904                 *a++ ^= *b++;
905
906         crypto_xor_byte((u8 *)a, (u8 *)b, size);
907 }
908 EXPORT_SYMBOL_GPL(crypto_xor);
909
910 static int __init crypto_algapi_init(void)
911 {
912         crypto_init_proc();
913         return 0;
914 }
915
916 static void __exit crypto_algapi_exit(void)
917 {
918         crypto_exit_proc();
919 }
920
921 module_init(crypto_algapi_init);
922 module_exit(crypto_algapi_exit);
923
924 MODULE_LICENSE("GPL");
925 MODULE_DESCRIPTION("Cryptographic algorithms API");