Loading...
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
25static void crypto_remove_final(struct list_head *list);
26
27static LIST_HEAD(crypto_template_list);
28
29void crypto_larval_error(const char *name, u32 type, u32 mask)
30{
31 struct crypto_alg *alg;
32
33 alg = crypto_alg_lookup(name, type, mask);
34
35 if (alg) {
36 if (crypto_is_larval(alg)) {
37 struct crypto_larval *larval = (void *)alg;
38 complete_all(&larval->completion);
39 }
40 crypto_mod_put(alg);
41 }
42}
43EXPORT_SYMBOL_GPL(crypto_larval_error);
44
45static inline int crypto_set_driver_name(struct crypto_alg *alg)
46{
47 static const char suffix[] = "-generic";
48 char *driver_name = alg->cra_driver_name;
49 int len;
50
51 if (*driver_name)
52 return 0;
53
54 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
55 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
56 return -ENAMETOOLONG;
57
58 memcpy(driver_name + len, suffix, sizeof(suffix));
59 return 0;
60}
61
62static int crypto_check_alg(struct crypto_alg *alg)
63{
64 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
65 return -EINVAL;
66
67 if (alg->cra_blocksize > PAGE_SIZE / 8)
68 return -EINVAL;
69
70 if (alg->cra_priority < 0)
71 return -EINVAL;
72
73 return crypto_set_driver_name(alg);
74}
75
76static void crypto_destroy_instance(struct crypto_alg *alg)
77{
78 struct crypto_instance *inst = (void *)alg;
79 struct crypto_template *tmpl = inst->tmpl;
80
81 tmpl->free(inst);
82 crypto_tmpl_put(tmpl);
83}
84
85static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
86 struct list_head *stack,
87 struct list_head *top,
88 struct list_head *secondary_spawns)
89{
90 struct crypto_spawn *spawn, *n;
91
92 if (list_empty(stack))
93 return NULL;
94
95 spawn = list_first_entry(stack, struct crypto_spawn, list);
96 n = list_entry(spawn->list.next, struct crypto_spawn, list);
97
98 if (spawn->alg && &n->list != stack && !n->alg)
99 n->alg = (n->list.next == stack) ? alg :
100 &list_entry(n->list.next, struct crypto_spawn,
101 list)->inst->alg;
102
103 list_move(&spawn->list, secondary_spawns);
104
105 return &n->list == stack ? top : &n->inst->alg.cra_users;
106}
107
108static void crypto_remove_spawn(struct crypto_spawn *spawn,
109 struct list_head *list)
110{
111 struct crypto_instance *inst = spawn->inst;
112 struct crypto_template *tmpl = inst->tmpl;
113
114 if (crypto_is_dead(&inst->alg))
115 return;
116
117 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
118 if (hlist_unhashed(&inst->list))
119 return;
120
121 if (!tmpl || !crypto_tmpl_get(tmpl))
122 return;
123
124 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
125 list_move(&inst->alg.cra_list, list);
126 hlist_del(&inst->list);
127 inst->alg.cra_destroy = crypto_destroy_instance;
128
129 BUG_ON(!list_empty(&inst->alg.cra_users));
130}
131
132static void crypto_remove_spawns(struct crypto_alg *alg,
133 struct list_head *list,
134 struct crypto_alg *nalg)
135{
136 u32 new_type = (nalg ?: alg)->cra_flags;
137 struct crypto_spawn *spawn, *n;
138 LIST_HEAD(secondary_spawns);
139 struct list_head *spawns;
140 LIST_HEAD(stack);
141 LIST_HEAD(top);
142
143 spawns = &alg->cra_users;
144 list_for_each_entry_safe(spawn, n, spawns, list) {
145 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
146 continue;
147
148 list_move(&spawn->list, &top);
149 }
150
151 spawns = ⊤
152 do {
153 while (!list_empty(spawns)) {
154 struct crypto_instance *inst;
155
156 spawn = list_first_entry(spawns, struct crypto_spawn,
157 list);
158 inst = spawn->inst;
159
160 BUG_ON(&inst->alg == alg);
161
162 list_move(&spawn->list, &stack);
163
164 if (&inst->alg == nalg)
165 break;
166
167 spawn->alg = NULL;
168 spawns = &inst->alg.cra_users;
169 }
170 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
171 &secondary_spawns)));
172
173 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
174 if (spawn->alg)
175 list_move(&spawn->list, &spawn->alg->cra_users);
176 else
177 crypto_remove_spawn(spawn, list);
178 }
179}
180
181static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
182{
183 struct crypto_alg *q;
184 struct crypto_larval *larval;
185 int ret = -EAGAIN;
186
187 if (crypto_is_dead(alg))
188 goto err;
189
190 INIT_LIST_HEAD(&alg->cra_users);
191
192 /* No cheating! */
193 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
194
195 ret = -EEXIST;
196
197 atomic_set(&alg->cra_refcnt, 1);
198 list_for_each_entry(q, &crypto_alg_list, cra_list) {
199 if (q == alg)
200 goto err;
201
202 if (crypto_is_moribund(q))
203 continue;
204
205 if (crypto_is_larval(q)) {
206 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
207 goto err;
208 continue;
209 }
210
211 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
212 !strcmp(q->cra_name, alg->cra_driver_name))
213 goto err;
214 }
215
216 larval = crypto_larval_alloc(alg->cra_name,
217 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
218 if (IS_ERR(larval))
219 goto out;
220
221 ret = -ENOENT;
222 larval->adult = crypto_mod_get(alg);
223 if (!larval->adult)
224 goto free_larval;
225
226 atomic_set(&larval->alg.cra_refcnt, 1);
227 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
228 CRYPTO_MAX_ALG_NAME);
229 larval->alg.cra_priority = alg->cra_priority;
230
231 list_add(&alg->cra_list, &crypto_alg_list);
232 list_add(&larval->alg.cra_list, &crypto_alg_list);
233
234out:
235 return larval;
236
237free_larval:
238 kfree(larval);
239err:
240 larval = ERR_PTR(ret);
241 goto out;
242}
243
244void crypto_alg_tested(const char *name, int err)
245{
246 struct crypto_larval *test;
247 struct crypto_alg *alg;
248 struct crypto_alg *q;
249 LIST_HEAD(list);
250
251 down_write(&crypto_alg_sem);
252 list_for_each_entry(q, &crypto_alg_list, cra_list) {
253 if (crypto_is_moribund(q) || !crypto_is_larval(q))
254 continue;
255
256 test = (struct crypto_larval *)q;
257
258 if (!strcmp(q->cra_driver_name, name))
259 goto found;
260 }
261
262 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
263 goto unlock;
264
265found:
266 q->cra_flags |= CRYPTO_ALG_DEAD;
267 alg = test->adult;
268 if (err || list_empty(&alg->cra_list))
269 goto complete;
270
271 alg->cra_flags |= CRYPTO_ALG_TESTED;
272
273 list_for_each_entry(q, &crypto_alg_list, cra_list) {
274 if (q == alg)
275 continue;
276
277 if (crypto_is_moribund(q))
278 continue;
279
280 if (crypto_is_larval(q)) {
281 struct crypto_larval *larval = (void *)q;
282
283 /*
284 * Check to see if either our generic name or
285 * specific name can satisfy the name requested
286 * by the larval entry q.
287 */
288 if (strcmp(alg->cra_name, q->cra_name) &&
289 strcmp(alg->cra_driver_name, q->cra_name))
290 continue;
291
292 if (larval->adult)
293 continue;
294 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
295 continue;
296 if (!crypto_mod_get(alg))
297 continue;
298
299 larval->adult = alg;
300 complete_all(&larval->completion);
301 continue;
302 }
303
304 if (strcmp(alg->cra_name, q->cra_name))
305 continue;
306
307 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
308 q->cra_priority > alg->cra_priority)
309 continue;
310
311 crypto_remove_spawns(q, &list, alg);
312 }
313
314complete:
315 complete_all(&test->completion);
316
317unlock:
318 up_write(&crypto_alg_sem);
319
320 crypto_remove_final(&list);
321}
322EXPORT_SYMBOL_GPL(crypto_alg_tested);
323
324static void crypto_remove_final(struct list_head *list)
325{
326 struct crypto_alg *alg;
327 struct crypto_alg *n;
328
329 list_for_each_entry_safe(alg, n, list, cra_list) {
330 list_del_init(&alg->cra_list);
331 crypto_alg_put(alg);
332 }
333}
334
335static void crypto_wait_for_test(struct crypto_larval *larval)
336{
337 int err;
338
339 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
340 if (err != NOTIFY_STOP) {
341 if (WARN_ON(err != NOTIFY_DONE))
342 goto out;
343 crypto_alg_tested(larval->alg.cra_driver_name, 0);
344 }
345
346 err = wait_for_completion_interruptible(&larval->completion);
347 WARN_ON(err);
348
349out:
350 crypto_larval_kill(&larval->alg);
351}
352
353int crypto_register_alg(struct crypto_alg *alg)
354{
355 struct crypto_larval *larval;
356 int err;
357
358 err = crypto_check_alg(alg);
359 if (err)
360 return err;
361
362 down_write(&crypto_alg_sem);
363 larval = __crypto_register_alg(alg);
364 up_write(&crypto_alg_sem);
365
366 if (IS_ERR(larval))
367 return PTR_ERR(larval);
368
369 crypto_wait_for_test(larval);
370 return 0;
371}
372EXPORT_SYMBOL_GPL(crypto_register_alg);
373
374static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
375{
376 if (unlikely(list_empty(&alg->cra_list)))
377 return -ENOENT;
378
379 alg->cra_flags |= CRYPTO_ALG_DEAD;
380
381 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
382 list_del_init(&alg->cra_list);
383 crypto_remove_spawns(alg, list, NULL);
384
385 return 0;
386}
387
388int crypto_unregister_alg(struct crypto_alg *alg)
389{
390 int ret;
391 LIST_HEAD(list);
392
393 down_write(&crypto_alg_sem);
394 ret = crypto_remove_alg(alg, &list);
395 up_write(&crypto_alg_sem);
396
397 if (ret)
398 return ret;
399
400 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
401 if (alg->cra_destroy)
402 alg->cra_destroy(alg);
403
404 crypto_remove_final(&list);
405 return 0;
406}
407EXPORT_SYMBOL_GPL(crypto_unregister_alg);
408
409int crypto_register_template(struct crypto_template *tmpl)
410{
411 struct crypto_template *q;
412 int err = -EEXIST;
413
414 down_write(&crypto_alg_sem);
415
416 list_for_each_entry(q, &crypto_template_list, list) {
417 if (q == tmpl)
418 goto out;
419 }
420
421 list_add(&tmpl->list, &crypto_template_list);
422 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
423 err = 0;
424out:
425 up_write(&crypto_alg_sem);
426 return err;
427}
428EXPORT_SYMBOL_GPL(crypto_register_template);
429
430void crypto_unregister_template(struct crypto_template *tmpl)
431{
432 struct crypto_instance *inst;
433 struct hlist_node *p, *n;
434 struct hlist_head *list;
435 LIST_HEAD(users);
436
437 down_write(&crypto_alg_sem);
438
439 BUG_ON(list_empty(&tmpl->list));
440 list_del_init(&tmpl->list);
441
442 list = &tmpl->instances;
443 hlist_for_each_entry(inst, p, list, list) {
444 int err = crypto_remove_alg(&inst->alg, &users);
445 BUG_ON(err);
446 }
447
448 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
449
450 up_write(&crypto_alg_sem);
451
452 hlist_for_each_entry_safe(inst, p, n, list, list) {
453 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
454 tmpl->free(inst);
455 }
456 crypto_remove_final(&users);
457}
458EXPORT_SYMBOL_GPL(crypto_unregister_template);
459
460static struct crypto_template *__crypto_lookup_template(const char *name)
461{
462 struct crypto_template *q, *tmpl = NULL;
463
464 down_read(&crypto_alg_sem);
465 list_for_each_entry(q, &crypto_template_list, list) {
466 if (strcmp(q->name, name))
467 continue;
468 if (unlikely(!crypto_tmpl_get(q)))
469 continue;
470
471 tmpl = q;
472 break;
473 }
474 up_read(&crypto_alg_sem);
475
476 return tmpl;
477}
478
479struct crypto_template *crypto_lookup_template(const char *name)
480{
481 return try_then_request_module(__crypto_lookup_template(name), name);
482}
483EXPORT_SYMBOL_GPL(crypto_lookup_template);
484
485int crypto_register_instance(struct crypto_template *tmpl,
486 struct crypto_instance *inst)
487{
488 struct crypto_larval *larval;
489 int err;
490
491 err = crypto_check_alg(&inst->alg);
492 if (err)
493 goto err;
494
495 inst->alg.cra_module = tmpl->module;
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
506unlock:
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
516err:
517 return err;
518}
519EXPORT_SYMBOL_GPL(crypto_register_instance);
520
521int 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}
539EXPORT_SYMBOL_GPL(crypto_init_spawn);
540
541int 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
553out:
554 return err;
555}
556EXPORT_SYMBOL_GPL(crypto_init_spawn2);
557
558void 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}
567EXPORT_SYMBOL_GPL(crypto_drop_spawn);
568
569static 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
590struct 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
610out_put_alg:
611 crypto_mod_put(alg);
612 return tfm;
613}
614EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
615
616void *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
631out_put_alg:
632 crypto_mod_put(alg);
633 return tfm;
634}
635EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
636
637int crypto_register_notifier(struct notifier_block *nb)
638{
639 return blocking_notifier_chain_register(&crypto_chain, nb);
640}
641EXPORT_SYMBOL_GPL(crypto_register_notifier);
642
643int crypto_unregister_notifier(struct notifier_block *nb)
644{
645 return blocking_notifier_chain_unregister(&crypto_chain, nb);
646}
647EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
648
649struct 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}
665EXPORT_SYMBOL_GPL(crypto_get_attr_type);
666
667int 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}
680EXPORT_SYMBOL_GPL(crypto_check_attr_type);
681
682const 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}
698EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
699
700struct 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}
714EXPORT_SYMBOL_GPL(crypto_attr_alg2);
715
716int 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}
732EXPORT_SYMBOL_GPL(crypto_attr_u32);
733
734void *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
759err_free_inst:
760 kfree(p);
761 return ERR_PTR(err);
762}
763EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
764
765struct 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
785err_free_inst:
786 kfree(inst);
787 inst = ERR_PTR(err);
788
789out:
790 return inst;
791}
792EXPORT_SYMBOL_GPL(crypto_alloc_instance);
793
794void 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}
801EXPORT_SYMBOL_GPL(crypto_init_queue);
802
803int 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
819out:
820 return err;
821}
822EXPORT_SYMBOL_GPL(crypto_enqueue_request);
823
824void *__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}
842EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
843
844struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
845{
846 return __crypto_dequeue_request(queue, 0);
847}
848EXPORT_SYMBOL_GPL(crypto_dequeue_request);
849
850int 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}
861EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
862
863static 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
876void 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}
890EXPORT_SYMBOL_GPL(crypto_inc);
891
892static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
893{
894 for (; size; size--)
895 *a++ ^= *b++;
896}
897
898void 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}
908EXPORT_SYMBOL_GPL(crypto_xor);
909
910static int __init crypto_algapi_init(void)
911{
912 crypto_init_proc();
913 return 0;
914}
915
916static void __exit crypto_algapi_exit(void)
917{
918 crypto_exit_proc();
919}
920
921module_init(crypto_algapi_init);
922module_exit(crypto_algapi_exit);
923
924MODULE_LICENSE("GPL");
925MODULE_DESCRIPTION("Cryptographic algorithms API");
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/fips.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/rtnetlink.h>
21#include <linux/slab.h>
22#include <linux/string.h>
23
24#include "internal.h"
25
26static LIST_HEAD(crypto_template_list);
27
28static inline int crypto_set_driver_name(struct crypto_alg *alg)
29{
30 static const char suffix[] = "-generic";
31 char *driver_name = alg->cra_driver_name;
32 int len;
33
34 if (*driver_name)
35 return 0;
36
37 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
38 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
39 return -ENAMETOOLONG;
40
41 memcpy(driver_name + len, suffix, sizeof(suffix));
42 return 0;
43}
44
45static inline void crypto_check_module_sig(struct module *mod)
46{
47 if (fips_enabled && mod && !module_sig_ok(mod))
48 panic("Module %s signature verification failed in FIPS mode\n",
49 module_name(mod));
50}
51
52static int crypto_check_alg(struct crypto_alg *alg)
53{
54 crypto_check_module_sig(alg->cra_module);
55
56 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
57 return -EINVAL;
58
59 if (alg->cra_blocksize > PAGE_SIZE / 8)
60 return -EINVAL;
61
62 if (alg->cra_priority < 0)
63 return -EINVAL;
64
65 atomic_set(&alg->cra_refcnt, 1);
66
67 return crypto_set_driver_name(alg);
68}
69
70static void crypto_free_instance(struct crypto_instance *inst)
71{
72 if (!inst->alg.cra_type->free) {
73 inst->tmpl->free(inst);
74 return;
75 }
76
77 inst->alg.cra_type->free(inst);
78}
79
80static void crypto_destroy_instance(struct crypto_alg *alg)
81{
82 struct crypto_instance *inst = (void *)alg;
83 struct crypto_template *tmpl = inst->tmpl;
84
85 crypto_free_instance(inst);
86 crypto_tmpl_put(tmpl);
87}
88
89static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
90 struct list_head *stack,
91 struct list_head *top,
92 struct list_head *secondary_spawns)
93{
94 struct crypto_spawn *spawn, *n;
95
96 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
97 if (!spawn)
98 return NULL;
99
100 n = list_next_entry(spawn, list);
101
102 if (spawn->alg && &n->list != stack && !n->alg)
103 n->alg = (n->list.next == stack) ? alg :
104 &list_next_entry(n, list)->inst->alg;
105
106 list_move(&spawn->list, secondary_spawns);
107
108 return &n->list == stack ? top : &n->inst->alg.cra_users;
109}
110
111static void crypto_remove_instance(struct crypto_instance *inst,
112 struct list_head *list)
113{
114 struct crypto_template *tmpl = inst->tmpl;
115
116 if (crypto_is_dead(&inst->alg))
117 return;
118
119 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
120 if (hlist_unhashed(&inst->list))
121 return;
122
123 if (!tmpl || !crypto_tmpl_get(tmpl))
124 return;
125
126 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
127 list_move(&inst->alg.cra_list, list);
128 hlist_del(&inst->list);
129 inst->alg.cra_destroy = crypto_destroy_instance;
130
131 BUG_ON(!list_empty(&inst->alg.cra_users));
132}
133
134void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
135 struct crypto_alg *nalg)
136{
137 u32 new_type = (nalg ?: alg)->cra_flags;
138 struct crypto_spawn *spawn, *n;
139 LIST_HEAD(secondary_spawns);
140 struct list_head *spawns;
141 LIST_HEAD(stack);
142 LIST_HEAD(top);
143
144 spawns = &alg->cra_users;
145 list_for_each_entry_safe(spawn, n, spawns, list) {
146 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
147 continue;
148
149 list_move(&spawn->list, &top);
150 }
151
152 spawns = ⊤
153 do {
154 while (!list_empty(spawns)) {
155 struct crypto_instance *inst;
156
157 spawn = list_first_entry(spawns, struct crypto_spawn,
158 list);
159 inst = spawn->inst;
160
161 BUG_ON(&inst->alg == alg);
162
163 list_move(&spawn->list, &stack);
164
165 if (&inst->alg == nalg)
166 break;
167
168 spawn->alg = NULL;
169 spawns = &inst->alg.cra_users;
170 }
171 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
172 &secondary_spawns)));
173
174 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
175 if (spawn->alg)
176 list_move(&spawn->list, &spawn->alg->cra_users);
177 else
178 crypto_remove_instance(spawn->inst, list);
179 }
180}
181EXPORT_SYMBOL_GPL(crypto_remove_spawns);
182
183static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
184{
185 struct crypto_alg *q;
186 struct crypto_larval *larval;
187 int ret = -EAGAIN;
188
189 if (crypto_is_dead(alg))
190 goto err;
191
192 INIT_LIST_HEAD(&alg->cra_users);
193
194 /* No cheating! */
195 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
196
197 ret = -EEXIST;
198
199 list_for_each_entry(q, &crypto_alg_list, cra_list) {
200 if (q == alg)
201 goto err;
202
203 if (crypto_is_moribund(q))
204 continue;
205
206 if (crypto_is_larval(q)) {
207 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
208 goto err;
209 continue;
210 }
211
212 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
213 !strcmp(q->cra_name, alg->cra_driver_name))
214 goto err;
215 }
216
217 larval = crypto_larval_alloc(alg->cra_name,
218 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
219 if (IS_ERR(larval))
220 goto out;
221
222 ret = -ENOENT;
223 larval->adult = crypto_mod_get(alg);
224 if (!larval->adult)
225 goto free_larval;
226
227 atomic_set(&larval->alg.cra_refcnt, 1);
228 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
229 CRYPTO_MAX_ALG_NAME);
230 larval->alg.cra_priority = alg->cra_priority;
231
232 list_add(&alg->cra_list, &crypto_alg_list);
233 list_add(&larval->alg.cra_list, &crypto_alg_list);
234
235out:
236 return larval;
237
238free_larval:
239 kfree(larval);
240err:
241 larval = ERR_PTR(ret);
242 goto out;
243}
244
245void crypto_alg_tested(const char *name, int err)
246{
247 struct crypto_larval *test;
248 struct crypto_alg *alg;
249 struct crypto_alg *q;
250 LIST_HEAD(list);
251
252 down_write(&crypto_alg_sem);
253 list_for_each_entry(q, &crypto_alg_list, cra_list) {
254 if (crypto_is_moribund(q) || !crypto_is_larval(q))
255 continue;
256
257 test = (struct crypto_larval *)q;
258
259 if (!strcmp(q->cra_driver_name, name))
260 goto found;
261 }
262
263 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
264 goto unlock;
265
266found:
267 q->cra_flags |= CRYPTO_ALG_DEAD;
268 alg = test->adult;
269 if (err || list_empty(&alg->cra_list))
270 goto complete;
271
272 alg->cra_flags |= CRYPTO_ALG_TESTED;
273
274 list_for_each_entry(q, &crypto_alg_list, cra_list) {
275 if (q == alg)
276 continue;
277
278 if (crypto_is_moribund(q))
279 continue;
280
281 if (crypto_is_larval(q)) {
282 struct crypto_larval *larval = (void *)q;
283
284 /*
285 * Check to see if either our generic name or
286 * specific name can satisfy the name requested
287 * by the larval entry q.
288 */
289 if (strcmp(alg->cra_name, q->cra_name) &&
290 strcmp(alg->cra_driver_name, q->cra_name))
291 continue;
292
293 if (larval->adult)
294 continue;
295 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
296 continue;
297 if (!crypto_mod_get(alg))
298 continue;
299
300 larval->adult = alg;
301 continue;
302 }
303
304 if (strcmp(alg->cra_name, q->cra_name))
305 continue;
306
307 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
308 q->cra_priority > alg->cra_priority)
309 continue;
310
311 crypto_remove_spawns(q, &list, alg);
312 }
313
314complete:
315 complete_all(&test->completion);
316
317unlock:
318 up_write(&crypto_alg_sem);
319
320 crypto_remove_final(&list);
321}
322EXPORT_SYMBOL_GPL(crypto_alg_tested);
323
324void crypto_remove_final(struct list_head *list)
325{
326 struct crypto_alg *alg;
327 struct crypto_alg *n;
328
329 list_for_each_entry_safe(alg, n, list, cra_list) {
330 list_del_init(&alg->cra_list);
331 crypto_alg_put(alg);
332 }
333}
334EXPORT_SYMBOL_GPL(crypto_remove_final);
335
336static void crypto_wait_for_test(struct crypto_larval *larval)
337{
338 int err;
339
340 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
341 if (err != NOTIFY_STOP) {
342 if (WARN_ON(err != NOTIFY_DONE))
343 goto out;
344 crypto_alg_tested(larval->alg.cra_driver_name, 0);
345 }
346
347 err = wait_for_completion_killable(&larval->completion);
348 WARN_ON(err);
349
350out:
351 crypto_larval_kill(&larval->alg);
352}
353
354int crypto_register_alg(struct crypto_alg *alg)
355{
356 struct crypto_larval *larval;
357 int err;
358
359 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
360 err = crypto_check_alg(alg);
361 if (err)
362 return err;
363
364 down_write(&crypto_alg_sem);
365 larval = __crypto_register_alg(alg);
366 up_write(&crypto_alg_sem);
367
368 if (IS_ERR(larval))
369 return PTR_ERR(larval);
370
371 crypto_wait_for_test(larval);
372 return 0;
373}
374EXPORT_SYMBOL_GPL(crypto_register_alg);
375
376static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
377{
378 if (unlikely(list_empty(&alg->cra_list)))
379 return -ENOENT;
380
381 alg->cra_flags |= CRYPTO_ALG_DEAD;
382
383 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
384 list_del_init(&alg->cra_list);
385 crypto_remove_spawns(alg, list, NULL);
386
387 return 0;
388}
389
390int crypto_unregister_alg(struct crypto_alg *alg)
391{
392 int ret;
393 LIST_HEAD(list);
394
395 down_write(&crypto_alg_sem);
396 ret = crypto_remove_alg(alg, &list);
397 up_write(&crypto_alg_sem);
398
399 if (ret)
400 return ret;
401
402 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
403 if (alg->cra_destroy)
404 alg->cra_destroy(alg);
405
406 crypto_remove_final(&list);
407 return 0;
408}
409EXPORT_SYMBOL_GPL(crypto_unregister_alg);
410
411int crypto_register_algs(struct crypto_alg *algs, int count)
412{
413 int i, ret;
414
415 for (i = 0; i < count; i++) {
416 ret = crypto_register_alg(&algs[i]);
417 if (ret)
418 goto err;
419 }
420
421 return 0;
422
423err:
424 for (--i; i >= 0; --i)
425 crypto_unregister_alg(&algs[i]);
426
427 return ret;
428}
429EXPORT_SYMBOL_GPL(crypto_register_algs);
430
431int crypto_unregister_algs(struct crypto_alg *algs, int count)
432{
433 int i, ret;
434
435 for (i = 0; i < count; i++) {
436 ret = crypto_unregister_alg(&algs[i]);
437 if (ret)
438 pr_err("Failed to unregister %s %s: %d\n",
439 algs[i].cra_driver_name, algs[i].cra_name, ret);
440 }
441
442 return 0;
443}
444EXPORT_SYMBOL_GPL(crypto_unregister_algs);
445
446int crypto_register_template(struct crypto_template *tmpl)
447{
448 struct crypto_template *q;
449 int err = -EEXIST;
450
451 down_write(&crypto_alg_sem);
452
453 crypto_check_module_sig(tmpl->module);
454
455 list_for_each_entry(q, &crypto_template_list, list) {
456 if (q == tmpl)
457 goto out;
458 }
459
460 list_add(&tmpl->list, &crypto_template_list);
461 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
462 err = 0;
463out:
464 up_write(&crypto_alg_sem);
465 return err;
466}
467EXPORT_SYMBOL_GPL(crypto_register_template);
468
469void crypto_unregister_template(struct crypto_template *tmpl)
470{
471 struct crypto_instance *inst;
472 struct hlist_node *n;
473 struct hlist_head *list;
474 LIST_HEAD(users);
475
476 down_write(&crypto_alg_sem);
477
478 BUG_ON(list_empty(&tmpl->list));
479 list_del_init(&tmpl->list);
480
481 list = &tmpl->instances;
482 hlist_for_each_entry(inst, list, list) {
483 int err = crypto_remove_alg(&inst->alg, &users);
484
485 BUG_ON(err);
486 }
487
488 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
489
490 up_write(&crypto_alg_sem);
491
492 hlist_for_each_entry_safe(inst, n, list, list) {
493 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
494 crypto_free_instance(inst);
495 }
496 crypto_remove_final(&users);
497}
498EXPORT_SYMBOL_GPL(crypto_unregister_template);
499
500static struct crypto_template *__crypto_lookup_template(const char *name)
501{
502 struct crypto_template *q, *tmpl = NULL;
503
504 down_read(&crypto_alg_sem);
505 list_for_each_entry(q, &crypto_template_list, list) {
506 if (strcmp(q->name, name))
507 continue;
508 if (unlikely(!crypto_tmpl_get(q)))
509 continue;
510
511 tmpl = q;
512 break;
513 }
514 up_read(&crypto_alg_sem);
515
516 return tmpl;
517}
518
519struct crypto_template *crypto_lookup_template(const char *name)
520{
521 return try_then_request_module(__crypto_lookup_template(name),
522 "crypto-%s", name);
523}
524EXPORT_SYMBOL_GPL(crypto_lookup_template);
525
526int crypto_register_instance(struct crypto_template *tmpl,
527 struct crypto_instance *inst)
528{
529 struct crypto_larval *larval;
530 int err;
531
532 err = crypto_check_alg(&inst->alg);
533 if (err)
534 return err;
535
536 inst->alg.cra_module = tmpl->module;
537 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
538
539 if (unlikely(!crypto_mod_get(&inst->alg)))
540 return -EAGAIN;
541
542 down_write(&crypto_alg_sem);
543
544 larval = __crypto_register_alg(&inst->alg);
545 if (IS_ERR(larval))
546 goto unlock;
547
548 hlist_add_head(&inst->list, &tmpl->instances);
549 inst->tmpl = tmpl;
550
551unlock:
552 up_write(&crypto_alg_sem);
553
554 err = PTR_ERR(larval);
555 if (IS_ERR(larval))
556 goto err;
557
558 crypto_wait_for_test(larval);
559
560 /* Remove instance if test failed */
561 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
562 crypto_unregister_instance(inst);
563 err = 0;
564
565err:
566 crypto_mod_put(&inst->alg);
567 return err;
568}
569EXPORT_SYMBOL_GPL(crypto_register_instance);
570
571int crypto_unregister_instance(struct crypto_instance *inst)
572{
573 LIST_HEAD(list);
574
575 down_write(&crypto_alg_sem);
576
577 crypto_remove_spawns(&inst->alg, &list, NULL);
578 crypto_remove_instance(inst, &list);
579
580 up_write(&crypto_alg_sem);
581
582 crypto_remove_final(&list);
583
584 return 0;
585}
586EXPORT_SYMBOL_GPL(crypto_unregister_instance);
587
588int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
589 struct crypto_instance *inst, u32 mask)
590{
591 int err = -EAGAIN;
592
593 spawn->inst = inst;
594 spawn->mask = mask;
595
596 down_write(&crypto_alg_sem);
597 if (!crypto_is_moribund(alg)) {
598 list_add(&spawn->list, &alg->cra_users);
599 spawn->alg = alg;
600 err = 0;
601 }
602 up_write(&crypto_alg_sem);
603
604 return err;
605}
606EXPORT_SYMBOL_GPL(crypto_init_spawn);
607
608int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
609 struct crypto_instance *inst,
610 const struct crypto_type *frontend)
611{
612 int err = -EINVAL;
613
614 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
615 goto out;
616
617 spawn->frontend = frontend;
618 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
619
620out:
621 return err;
622}
623EXPORT_SYMBOL_GPL(crypto_init_spawn2);
624
625int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
626 u32 type, u32 mask)
627{
628 struct crypto_alg *alg;
629 int err;
630
631 alg = crypto_find_alg(name, spawn->frontend, type, mask);
632 if (IS_ERR(alg))
633 return PTR_ERR(alg);
634
635 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
636 crypto_mod_put(alg);
637 return err;
638}
639EXPORT_SYMBOL_GPL(crypto_grab_spawn);
640
641void crypto_drop_spawn(struct crypto_spawn *spawn)
642{
643 if (!spawn->alg)
644 return;
645
646 down_write(&crypto_alg_sem);
647 list_del(&spawn->list);
648 up_write(&crypto_alg_sem);
649}
650EXPORT_SYMBOL_GPL(crypto_drop_spawn);
651
652static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
653{
654 struct crypto_alg *alg;
655 struct crypto_alg *alg2;
656
657 down_read(&crypto_alg_sem);
658 alg = spawn->alg;
659 alg2 = alg;
660 if (alg2)
661 alg2 = crypto_mod_get(alg2);
662 up_read(&crypto_alg_sem);
663
664 if (!alg2) {
665 if (alg)
666 crypto_shoot_alg(alg);
667 return ERR_PTR(-EAGAIN);
668 }
669
670 return alg;
671}
672
673struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
674 u32 mask)
675{
676 struct crypto_alg *alg;
677 struct crypto_tfm *tfm;
678
679 alg = crypto_spawn_alg(spawn);
680 if (IS_ERR(alg))
681 return ERR_CAST(alg);
682
683 tfm = ERR_PTR(-EINVAL);
684 if (unlikely((alg->cra_flags ^ type) & mask))
685 goto out_put_alg;
686
687 tfm = __crypto_alloc_tfm(alg, type, mask);
688 if (IS_ERR(tfm))
689 goto out_put_alg;
690
691 return tfm;
692
693out_put_alg:
694 crypto_mod_put(alg);
695 return tfm;
696}
697EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
698
699void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
700{
701 struct crypto_alg *alg;
702 struct crypto_tfm *tfm;
703
704 alg = crypto_spawn_alg(spawn);
705 if (IS_ERR(alg))
706 return ERR_CAST(alg);
707
708 tfm = crypto_create_tfm(alg, spawn->frontend);
709 if (IS_ERR(tfm))
710 goto out_put_alg;
711
712 return tfm;
713
714out_put_alg:
715 crypto_mod_put(alg);
716 return tfm;
717}
718EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
719
720int crypto_register_notifier(struct notifier_block *nb)
721{
722 return blocking_notifier_chain_register(&crypto_chain, nb);
723}
724EXPORT_SYMBOL_GPL(crypto_register_notifier);
725
726int crypto_unregister_notifier(struct notifier_block *nb)
727{
728 return blocking_notifier_chain_unregister(&crypto_chain, nb);
729}
730EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
731
732struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
733{
734 struct rtattr *rta = tb[0];
735 struct crypto_attr_type *algt;
736
737 if (!rta)
738 return ERR_PTR(-ENOENT);
739 if (RTA_PAYLOAD(rta) < sizeof(*algt))
740 return ERR_PTR(-EINVAL);
741 if (rta->rta_type != CRYPTOA_TYPE)
742 return ERR_PTR(-EINVAL);
743
744 algt = RTA_DATA(rta);
745
746 return algt;
747}
748EXPORT_SYMBOL_GPL(crypto_get_attr_type);
749
750int crypto_check_attr_type(struct rtattr **tb, u32 type)
751{
752 struct crypto_attr_type *algt;
753
754 algt = crypto_get_attr_type(tb);
755 if (IS_ERR(algt))
756 return PTR_ERR(algt);
757
758 if ((algt->type ^ type) & algt->mask)
759 return -EINVAL;
760
761 return 0;
762}
763EXPORT_SYMBOL_GPL(crypto_check_attr_type);
764
765const char *crypto_attr_alg_name(struct rtattr *rta)
766{
767 struct crypto_attr_alg *alga;
768
769 if (!rta)
770 return ERR_PTR(-ENOENT);
771 if (RTA_PAYLOAD(rta) < sizeof(*alga))
772 return ERR_PTR(-EINVAL);
773 if (rta->rta_type != CRYPTOA_ALG)
774 return ERR_PTR(-EINVAL);
775
776 alga = RTA_DATA(rta);
777 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
778
779 return alga->name;
780}
781EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
782
783struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
784 const struct crypto_type *frontend,
785 u32 type, u32 mask)
786{
787 const char *name;
788
789 name = crypto_attr_alg_name(rta);
790 if (IS_ERR(name))
791 return ERR_CAST(name);
792
793 return crypto_find_alg(name, frontend, type, mask);
794}
795EXPORT_SYMBOL_GPL(crypto_attr_alg2);
796
797int crypto_attr_u32(struct rtattr *rta, u32 *num)
798{
799 struct crypto_attr_u32 *nu32;
800
801 if (!rta)
802 return -ENOENT;
803 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
804 return -EINVAL;
805 if (rta->rta_type != CRYPTOA_U32)
806 return -EINVAL;
807
808 nu32 = RTA_DATA(rta);
809 *num = nu32->num;
810
811 return 0;
812}
813EXPORT_SYMBOL_GPL(crypto_attr_u32);
814
815int crypto_inst_setname(struct crypto_instance *inst, const char *name,
816 struct crypto_alg *alg)
817{
818 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
819 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
820 return -ENAMETOOLONG;
821
822 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
823 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
824 return -ENAMETOOLONG;
825
826 return 0;
827}
828EXPORT_SYMBOL_GPL(crypto_inst_setname);
829
830void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
831 unsigned int head)
832{
833 struct crypto_instance *inst;
834 char *p;
835 int err;
836
837 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
838 GFP_KERNEL);
839 if (!p)
840 return ERR_PTR(-ENOMEM);
841
842 inst = (void *)(p + head);
843
844 err = crypto_inst_setname(inst, name, alg);
845 if (err)
846 goto err_free_inst;
847
848 return p;
849
850err_free_inst:
851 kfree(p);
852 return ERR_PTR(err);
853}
854EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
855
856struct crypto_instance *crypto_alloc_instance(const char *name,
857 struct crypto_alg *alg)
858{
859 struct crypto_instance *inst;
860 struct crypto_spawn *spawn;
861 int err;
862
863 inst = crypto_alloc_instance2(name, alg, 0);
864 if (IS_ERR(inst))
865 goto out;
866
867 spawn = crypto_instance_ctx(inst);
868 err = crypto_init_spawn(spawn, alg, inst,
869 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
870
871 if (err)
872 goto err_free_inst;
873
874 return inst;
875
876err_free_inst:
877 kfree(inst);
878 inst = ERR_PTR(err);
879
880out:
881 return inst;
882}
883EXPORT_SYMBOL_GPL(crypto_alloc_instance);
884
885void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
886{
887 INIT_LIST_HEAD(&queue->list);
888 queue->backlog = &queue->list;
889 queue->qlen = 0;
890 queue->max_qlen = max_qlen;
891}
892EXPORT_SYMBOL_GPL(crypto_init_queue);
893
894int crypto_enqueue_request(struct crypto_queue *queue,
895 struct crypto_async_request *request)
896{
897 int err = -EINPROGRESS;
898
899 if (unlikely(queue->qlen >= queue->max_qlen)) {
900 err = -EBUSY;
901 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
902 goto out;
903 if (queue->backlog == &queue->list)
904 queue->backlog = &request->list;
905 }
906
907 queue->qlen++;
908 list_add_tail(&request->list, &queue->list);
909
910out:
911 return err;
912}
913EXPORT_SYMBOL_GPL(crypto_enqueue_request);
914
915struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
916{
917 struct list_head *request;
918
919 if (unlikely(!queue->qlen))
920 return NULL;
921
922 queue->qlen--;
923
924 if (queue->backlog != &queue->list)
925 queue->backlog = queue->backlog->next;
926
927 request = queue->list.next;
928 list_del(request);
929
930 return list_entry(request, struct crypto_async_request, list);
931}
932EXPORT_SYMBOL_GPL(crypto_dequeue_request);
933
934int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
935{
936 struct crypto_async_request *req;
937
938 list_for_each_entry(req, &queue->list, list) {
939 if (req->tfm == tfm)
940 return 1;
941 }
942
943 return 0;
944}
945EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
946
947static inline void crypto_inc_byte(u8 *a, unsigned int size)
948{
949 u8 *b = (a + size);
950 u8 c;
951
952 for (; size; size--) {
953 c = *--b + 1;
954 *b = c;
955 if (c)
956 break;
957 }
958}
959
960void crypto_inc(u8 *a, unsigned int size)
961{
962 __be32 *b = (__be32 *)(a + size);
963 u32 c;
964
965 for (; size >= 4; size -= 4) {
966 c = be32_to_cpu(*--b) + 1;
967 *b = cpu_to_be32(c);
968 if (c)
969 return;
970 }
971
972 crypto_inc_byte(a, size);
973}
974EXPORT_SYMBOL_GPL(crypto_inc);
975
976static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
977{
978 for (; size; size--)
979 *a++ ^= *b++;
980}
981
982void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
983{
984 u32 *a = (u32 *)dst;
985 u32 *b = (u32 *)src;
986
987 for (; size >= 4; size -= 4)
988 *a++ ^= *b++;
989
990 crypto_xor_byte((u8 *)a, (u8 *)b, size);
991}
992EXPORT_SYMBOL_GPL(crypto_xor);
993
994unsigned int crypto_alg_extsize(struct crypto_alg *alg)
995{
996 return alg->cra_ctxsize +
997 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
998}
999EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1000
1001int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1002 u32 type, u32 mask)
1003{
1004 int ret = 0;
1005 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1006
1007 if (!IS_ERR(alg)) {
1008 crypto_mod_put(alg);
1009 ret = 1;
1010 }
1011
1012 return ret;
1013}
1014EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1015
1016static int __init crypto_algapi_init(void)
1017{
1018 crypto_init_proc();
1019 return 0;
1020}
1021
1022static void __exit crypto_algapi_exit(void)
1023{
1024 crypto_exit_proc();
1025}
1026
1027module_init(crypto_algapi_init);
1028module_exit(crypto_algapi_exit);
1029
1030MODULE_LICENSE("GPL");
1031MODULE_DESCRIPTION("Cryptographic algorithms API");