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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
24static void crypto_remove_final(struct list_head *list);
25
26static LIST_HEAD(crypto_template_list);
27
28void 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}
42EXPORT_SYMBOL_GPL(crypto_larval_error);
43
44static 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
61static 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
75static 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
84static 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
107static 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
131static 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 = ⊤
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
180static 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
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
233out:
234 return larval;
235
236free_larval:
237 kfree(larval);
238err:
239 larval = ERR_PTR(ret);
240 goto out;
241}
242
243void 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
264found:
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
284
285
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
313complete:
314 complete_all(&test->completion);
315
316unlock:
317 up_write(&crypto_alg_sem);
318
319 crypto_remove_final(&list);
320}
321EXPORT_SYMBOL_GPL(crypto_alg_tested);
322
323static 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
334static 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
348out:
349 crypto_larval_kill(&larval->alg);
350}
351
352int 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}
371EXPORT_SYMBOL_GPL(crypto_register_alg);
372
373static 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
387int 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}
406EXPORT_SYMBOL_GPL(crypto_unregister_alg);
407
408int 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;
423out:
424 up_write(&crypto_alg_sem);
425 return err;
426}
427EXPORT_SYMBOL_GPL(crypto_register_template);
428
429void 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}
457EXPORT_SYMBOL_GPL(crypto_unregister_template);
458
459static 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
478struct crypto_template *crypto_lookup_template(const char *name)
479{
480 return try_then_request_module(__crypto_lookup_template(name), name);
481}
482EXPORT_SYMBOL_GPL(crypto_lookup_template);
483
484int 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
505unlock:
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
515err:
516 return err;
517}
518EXPORT_SYMBOL_GPL(crypto_register_instance);
519
520int 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}
538EXPORT_SYMBOL_GPL(crypto_init_spawn);
539
540int 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
552out:
553 return err;
554}
555EXPORT_SYMBOL_GPL(crypto_init_spawn2);
556
557void 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}
566EXPORT_SYMBOL_GPL(crypto_drop_spawn);
567
568static 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
589struct 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
609out_put_alg:
610 crypto_mod_put(alg);
611 return tfm;
612}
613EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
614
615void *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
630out_put_alg:
631 crypto_mod_put(alg);
632 return tfm;
633}
634EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
635
636int crypto_register_notifier(struct notifier_block *nb)
637{
638 return blocking_notifier_chain_register(&crypto_chain, nb);
639}
640EXPORT_SYMBOL_GPL(crypto_register_notifier);
641
642int crypto_unregister_notifier(struct notifier_block *nb)
643{
644 return blocking_notifier_chain_unregister(&crypto_chain, nb);
645}
646EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
647
648struct 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}
664EXPORT_SYMBOL_GPL(crypto_get_attr_type);
665
666int 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}
679EXPORT_SYMBOL_GPL(crypto_check_attr_type);
680
681const 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}
697EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
698
699struct 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}
713EXPORT_SYMBOL_GPL(crypto_attr_alg2);
714
715int 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}
731EXPORT_SYMBOL_GPL(crypto_attr_u32);
732
733void *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
758err_free_inst:
759 kfree(p);
760 return ERR_PTR(err);
761}
762EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
763
764struct 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
784err_free_inst:
785 kfree(inst);
786 inst = ERR_PTR(err);
787
788out:
789 return inst;
790}
791EXPORT_SYMBOL_GPL(crypto_alloc_instance);
792
793void 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}
800EXPORT_SYMBOL_GPL(crypto_init_queue);
801
802int 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
818out:
819 return err;
820}
821EXPORT_SYMBOL_GPL(crypto_enqueue_request);
822
823void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
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 (char *)list_entry(request, struct crypto_async_request, list) -
839 offset;
840}
841EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
842
843struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
844{
845 return __crypto_dequeue_request(queue, 0);
846}
847EXPORT_SYMBOL_GPL(crypto_dequeue_request);
848
849int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
850{
851 struct crypto_async_request *req;
852
853 list_for_each_entry(req, &queue->list, list) {
854 if (req->tfm == tfm)
855 return 1;
856 }
857
858 return 0;
859}
860EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
861
862static inline void crypto_inc_byte(u8 *a, unsigned int size)
863{
864 u8 *b = (a + size);
865 u8 c;
866
867 for (; size; size--) {
868 c = *--b + 1;
869 *b = c;
870 if (c)
871 break;
872 }
873}
874
875void crypto_inc(u8 *a, unsigned int size)
876{
877 __be32 *b = (__be32 *)(a + size);
878 u32 c;
879
880 for (; size >= 4; size -= 4) {
881 c = be32_to_cpu(*--b) + 1;
882 *b = cpu_to_be32(c);
883 if (c)
884 return;
885 }
886
887 crypto_inc_byte(a, size);
888}
889EXPORT_SYMBOL_GPL(crypto_inc);
890
891static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
892{
893 for (; size; size--)
894 *a++ ^= *b++;
895}
896
897void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
898{
899 u32 *a = (u32 *)dst;
900 u32 *b = (u32 *)src;
901
902 for (; size >= 4; size -= 4)
903 *a++ ^= *b++;
904
905 crypto_xor_byte((u8 *)a, (u8 *)b, size);
906}
907EXPORT_SYMBOL_GPL(crypto_xor);
908
909static int __init crypto_algapi_init(void)
910{
911 crypto_init_proc();
912 return 0;
913}
914
915static void __exit crypto_algapi_exit(void)
916{
917 crypto_exit_proc();
918}
919
920module_init(crypto_algapi_init);
921module_exit(crypto_algapi_exit);
922
923MODULE_LICENSE("GPL");
924MODULE_DESCRIPTION("Cryptographic algorithms API");
925
