Merge remote-tracking branch 'mailbox/mailbox-for-next'
[deliverable/linux.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/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
26 static LIST_HEAD(crypto_template_list);
27
28 static 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
45 static 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
52 static 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
70 static 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
80 static 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
89 static 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
111 static 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
134 void 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 = &top;
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 }
181 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
182
183 static 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
235 out:
236 return larval;
237
238 free_larval:
239 kfree(larval);
240 err:
241 larval = ERR_PTR(ret);
242 goto out;
243 }
244
245 void 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
266 found:
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
314 complete:
315 complete_all(&test->completion);
316
317 unlock:
318 up_write(&crypto_alg_sem);
319
320 crypto_remove_final(&list);
321 }
322 EXPORT_SYMBOL_GPL(crypto_alg_tested);
323
324 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 EXPORT_SYMBOL_GPL(crypto_remove_final);
335
336 static 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
350 out:
351 crypto_larval_kill(&larval->alg);
352 }
353
354 int crypto_register_alg(struct crypto_alg *alg)
355 {
356 struct crypto_larval *larval;
357 int err;
358
359 err = crypto_check_alg(alg);
360 if (err)
361 return err;
362
363 down_write(&crypto_alg_sem);
364 larval = __crypto_register_alg(alg);
365 up_write(&crypto_alg_sem);
366
367 if (IS_ERR(larval))
368 return PTR_ERR(larval);
369
370 crypto_wait_for_test(larval);
371 return 0;
372 }
373 EXPORT_SYMBOL_GPL(crypto_register_alg);
374
375 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
376 {
377 if (unlikely(list_empty(&alg->cra_list)))
378 return -ENOENT;
379
380 alg->cra_flags |= CRYPTO_ALG_DEAD;
381
382 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
383 list_del_init(&alg->cra_list);
384 crypto_remove_spawns(alg, list, NULL);
385
386 return 0;
387 }
388
389 int crypto_unregister_alg(struct crypto_alg *alg)
390 {
391 int ret;
392 LIST_HEAD(list);
393
394 down_write(&crypto_alg_sem);
395 ret = crypto_remove_alg(alg, &list);
396 up_write(&crypto_alg_sem);
397
398 if (ret)
399 return ret;
400
401 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
402 if (alg->cra_destroy)
403 alg->cra_destroy(alg);
404
405 crypto_remove_final(&list);
406 return 0;
407 }
408 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
409
410 int crypto_register_algs(struct crypto_alg *algs, int count)
411 {
412 int i, ret;
413
414 for (i = 0; i < count; i++) {
415 ret = crypto_register_alg(&algs[i]);
416 if (ret)
417 goto err;
418 }
419
420 return 0;
421
422 err:
423 for (--i; i >= 0; --i)
424 crypto_unregister_alg(&algs[i]);
425
426 return ret;
427 }
428 EXPORT_SYMBOL_GPL(crypto_register_algs);
429
430 int crypto_unregister_algs(struct crypto_alg *algs, int count)
431 {
432 int i, ret;
433
434 for (i = 0; i < count; i++) {
435 ret = crypto_unregister_alg(&algs[i]);
436 if (ret)
437 pr_err("Failed to unregister %s %s: %d\n",
438 algs[i].cra_driver_name, algs[i].cra_name, ret);
439 }
440
441 return 0;
442 }
443 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
444
445 int crypto_register_template(struct crypto_template *tmpl)
446 {
447 struct crypto_template *q;
448 int err = -EEXIST;
449
450 down_write(&crypto_alg_sem);
451
452 crypto_check_module_sig(tmpl->module);
453
454 list_for_each_entry(q, &crypto_template_list, list) {
455 if (q == tmpl)
456 goto out;
457 }
458
459 list_add(&tmpl->list, &crypto_template_list);
460 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
461 err = 0;
462 out:
463 up_write(&crypto_alg_sem);
464 return err;
465 }
466 EXPORT_SYMBOL_GPL(crypto_register_template);
467
468 void crypto_unregister_template(struct crypto_template *tmpl)
469 {
470 struct crypto_instance *inst;
471 struct hlist_node *n;
472 struct hlist_head *list;
473 LIST_HEAD(users);
474
475 down_write(&crypto_alg_sem);
476
477 BUG_ON(list_empty(&tmpl->list));
478 list_del_init(&tmpl->list);
479
480 list = &tmpl->instances;
481 hlist_for_each_entry(inst, list, list) {
482 int err = crypto_remove_alg(&inst->alg, &users);
483
484 BUG_ON(err);
485 }
486
487 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
488
489 up_write(&crypto_alg_sem);
490
491 hlist_for_each_entry_safe(inst, n, list, list) {
492 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
493 crypto_free_instance(inst);
494 }
495 crypto_remove_final(&users);
496 }
497 EXPORT_SYMBOL_GPL(crypto_unregister_template);
498
499 static struct crypto_template *__crypto_lookup_template(const char *name)
500 {
501 struct crypto_template *q, *tmpl = NULL;
502
503 down_read(&crypto_alg_sem);
504 list_for_each_entry(q, &crypto_template_list, list) {
505 if (strcmp(q->name, name))
506 continue;
507 if (unlikely(!crypto_tmpl_get(q)))
508 continue;
509
510 tmpl = q;
511 break;
512 }
513 up_read(&crypto_alg_sem);
514
515 return tmpl;
516 }
517
518 struct crypto_template *crypto_lookup_template(const char *name)
519 {
520 return try_then_request_module(__crypto_lookup_template(name),
521 "crypto-%s", name);
522 }
523 EXPORT_SYMBOL_GPL(crypto_lookup_template);
524
525 int crypto_register_instance(struct crypto_template *tmpl,
526 struct crypto_instance *inst)
527 {
528 struct crypto_larval *larval;
529 int err;
530
531 err = crypto_check_alg(&inst->alg);
532 if (err)
533 return err;
534
535 inst->alg.cra_module = tmpl->module;
536 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
537
538 if (unlikely(!crypto_mod_get(&inst->alg)))
539 return -EAGAIN;
540
541 down_write(&crypto_alg_sem);
542
543 larval = __crypto_register_alg(&inst->alg);
544 if (IS_ERR(larval))
545 goto unlock;
546
547 hlist_add_head(&inst->list, &tmpl->instances);
548 inst->tmpl = tmpl;
549
550 unlock:
551 up_write(&crypto_alg_sem);
552
553 err = PTR_ERR(larval);
554 if (IS_ERR(larval))
555 goto err;
556
557 crypto_wait_for_test(larval);
558
559 /* Remove instance if test failed */
560 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
561 crypto_unregister_instance(inst);
562 err = 0;
563
564 err:
565 crypto_mod_put(&inst->alg);
566 return err;
567 }
568 EXPORT_SYMBOL_GPL(crypto_register_instance);
569
570 int crypto_unregister_instance(struct crypto_instance *inst)
571 {
572 LIST_HEAD(list);
573
574 down_write(&crypto_alg_sem);
575
576 crypto_remove_spawns(&inst->alg, &list, NULL);
577 crypto_remove_instance(inst, &list);
578
579 up_write(&crypto_alg_sem);
580
581 crypto_remove_final(&list);
582
583 return 0;
584 }
585 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
586
587 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
588 struct crypto_instance *inst, u32 mask)
589 {
590 int err = -EAGAIN;
591
592 spawn->inst = inst;
593 spawn->mask = mask;
594
595 down_write(&crypto_alg_sem);
596 if (!crypto_is_moribund(alg)) {
597 list_add(&spawn->list, &alg->cra_users);
598 spawn->alg = alg;
599 err = 0;
600 }
601 up_write(&crypto_alg_sem);
602
603 return err;
604 }
605 EXPORT_SYMBOL_GPL(crypto_init_spawn);
606
607 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
608 struct crypto_instance *inst,
609 const struct crypto_type *frontend)
610 {
611 int err = -EINVAL;
612
613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
614 goto out;
615
616 spawn->frontend = frontend;
617 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
618
619 out:
620 return err;
621 }
622 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
623
624 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
625 u32 type, u32 mask)
626 {
627 struct crypto_alg *alg;
628 int err;
629
630 alg = crypto_find_alg(name, spawn->frontend, type, mask);
631 if (IS_ERR(alg))
632 return PTR_ERR(alg);
633
634 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
635 crypto_mod_put(alg);
636 return err;
637 }
638 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
639
640 void crypto_drop_spawn(struct crypto_spawn *spawn)
641 {
642 if (!spawn->alg)
643 return;
644
645 down_write(&crypto_alg_sem);
646 list_del(&spawn->list);
647 up_write(&crypto_alg_sem);
648 }
649 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
650
651 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
652 {
653 struct crypto_alg *alg;
654 struct crypto_alg *alg2;
655
656 down_read(&crypto_alg_sem);
657 alg = spawn->alg;
658 alg2 = alg;
659 if (alg2)
660 alg2 = crypto_mod_get(alg2);
661 up_read(&crypto_alg_sem);
662
663 if (!alg2) {
664 if (alg)
665 crypto_shoot_alg(alg);
666 return ERR_PTR(-EAGAIN);
667 }
668
669 return alg;
670 }
671
672 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
673 u32 mask)
674 {
675 struct crypto_alg *alg;
676 struct crypto_tfm *tfm;
677
678 alg = crypto_spawn_alg(spawn);
679 if (IS_ERR(alg))
680 return ERR_CAST(alg);
681
682 tfm = ERR_PTR(-EINVAL);
683 if (unlikely((alg->cra_flags ^ type) & mask))
684 goto out_put_alg;
685
686 tfm = __crypto_alloc_tfm(alg, type, mask);
687 if (IS_ERR(tfm))
688 goto out_put_alg;
689
690 return tfm;
691
692 out_put_alg:
693 crypto_mod_put(alg);
694 return tfm;
695 }
696 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
697
698 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
699 {
700 struct crypto_alg *alg;
701 struct crypto_tfm *tfm;
702
703 alg = crypto_spawn_alg(spawn);
704 if (IS_ERR(alg))
705 return ERR_CAST(alg);
706
707 tfm = crypto_create_tfm(alg, spawn->frontend);
708 if (IS_ERR(tfm))
709 goto out_put_alg;
710
711 return tfm;
712
713 out_put_alg:
714 crypto_mod_put(alg);
715 return tfm;
716 }
717 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
718
719 int crypto_register_notifier(struct notifier_block *nb)
720 {
721 return blocking_notifier_chain_register(&crypto_chain, nb);
722 }
723 EXPORT_SYMBOL_GPL(crypto_register_notifier);
724
725 int crypto_unregister_notifier(struct notifier_block *nb)
726 {
727 return blocking_notifier_chain_unregister(&crypto_chain, nb);
728 }
729 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
730
731 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
732 {
733 struct rtattr *rta = tb[0];
734 struct crypto_attr_type *algt;
735
736 if (!rta)
737 return ERR_PTR(-ENOENT);
738 if (RTA_PAYLOAD(rta) < sizeof(*algt))
739 return ERR_PTR(-EINVAL);
740 if (rta->rta_type != CRYPTOA_TYPE)
741 return ERR_PTR(-EINVAL);
742
743 algt = RTA_DATA(rta);
744
745 return algt;
746 }
747 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
748
749 int crypto_check_attr_type(struct rtattr **tb, u32 type)
750 {
751 struct crypto_attr_type *algt;
752
753 algt = crypto_get_attr_type(tb);
754 if (IS_ERR(algt))
755 return PTR_ERR(algt);
756
757 if ((algt->type ^ type) & algt->mask)
758 return -EINVAL;
759
760 return 0;
761 }
762 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
763
764 const char *crypto_attr_alg_name(struct rtattr *rta)
765 {
766 struct crypto_attr_alg *alga;
767
768 if (!rta)
769 return ERR_PTR(-ENOENT);
770 if (RTA_PAYLOAD(rta) < sizeof(*alga))
771 return ERR_PTR(-EINVAL);
772 if (rta->rta_type != CRYPTOA_ALG)
773 return ERR_PTR(-EINVAL);
774
775 alga = RTA_DATA(rta);
776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
777
778 return alga->name;
779 }
780 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
781
782 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
783 const struct crypto_type *frontend,
784 u32 type, u32 mask)
785 {
786 const char *name;
787
788 name = crypto_attr_alg_name(rta);
789 if (IS_ERR(name))
790 return ERR_CAST(name);
791
792 return crypto_find_alg(name, frontend, type, mask);
793 }
794 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
795
796 int crypto_attr_u32(struct rtattr *rta, u32 *num)
797 {
798 struct crypto_attr_u32 *nu32;
799
800 if (!rta)
801 return -ENOENT;
802 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
803 return -EINVAL;
804 if (rta->rta_type != CRYPTOA_U32)
805 return -EINVAL;
806
807 nu32 = RTA_DATA(rta);
808 *num = nu32->num;
809
810 return 0;
811 }
812 EXPORT_SYMBOL_GPL(crypto_attr_u32);
813
814 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
815 struct crypto_alg *alg)
816 {
817 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
818 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
819 return -ENAMETOOLONG;
820
821 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
822 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
823 return -ENAMETOOLONG;
824
825 return 0;
826 }
827 EXPORT_SYMBOL_GPL(crypto_inst_setname);
828
829 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
830 unsigned int head)
831 {
832 struct crypto_instance *inst;
833 char *p;
834 int err;
835
836 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
837 GFP_KERNEL);
838 if (!p)
839 return ERR_PTR(-ENOMEM);
840
841 inst = (void *)(p + head);
842
843 err = crypto_inst_setname(inst, name, alg);
844 if (err)
845 goto err_free_inst;
846
847 return p;
848
849 err_free_inst:
850 kfree(p);
851 return ERR_PTR(err);
852 }
853 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
854
855 struct crypto_instance *crypto_alloc_instance(const char *name,
856 struct crypto_alg *alg)
857 {
858 struct crypto_instance *inst;
859 struct crypto_spawn *spawn;
860 int err;
861
862 inst = crypto_alloc_instance2(name, alg, 0);
863 if (IS_ERR(inst))
864 goto out;
865
866 spawn = crypto_instance_ctx(inst);
867 err = crypto_init_spawn(spawn, alg, inst,
868 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
869
870 if (err)
871 goto err_free_inst;
872
873 return inst;
874
875 err_free_inst:
876 kfree(inst);
877 inst = ERR_PTR(err);
878
879 out:
880 return inst;
881 }
882 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
883
884 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
885 {
886 INIT_LIST_HEAD(&queue->list);
887 queue->backlog = &queue->list;
888 queue->qlen = 0;
889 queue->max_qlen = max_qlen;
890 }
891 EXPORT_SYMBOL_GPL(crypto_init_queue);
892
893 int crypto_enqueue_request(struct crypto_queue *queue,
894 struct crypto_async_request *request)
895 {
896 int err = -EINPROGRESS;
897
898 if (unlikely(queue->qlen >= queue->max_qlen)) {
899 err = -EBUSY;
900 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
901 goto out;
902 if (queue->backlog == &queue->list)
903 queue->backlog = &request->list;
904 }
905
906 queue->qlen++;
907 list_add_tail(&request->list, &queue->list);
908
909 out:
910 return err;
911 }
912 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
913
914 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
915 {
916 struct list_head *request;
917
918 if (unlikely(!queue->qlen))
919 return NULL;
920
921 queue->qlen--;
922
923 if (queue->backlog != &queue->list)
924 queue->backlog = queue->backlog->next;
925
926 request = queue->list.next;
927 list_del(request);
928
929 return list_entry(request, struct crypto_async_request, list);
930 }
931 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
932
933 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
934 {
935 struct crypto_async_request *req;
936
937 list_for_each_entry(req, &queue->list, list) {
938 if (req->tfm == tfm)
939 return 1;
940 }
941
942 return 0;
943 }
944 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
945
946 static inline void crypto_inc_byte(u8 *a, unsigned int size)
947 {
948 u8 *b = (a + size);
949 u8 c;
950
951 for (; size; size--) {
952 c = *--b + 1;
953 *b = c;
954 if (c)
955 break;
956 }
957 }
958
959 void crypto_inc(u8 *a, unsigned int size)
960 {
961 __be32 *b = (__be32 *)(a + size);
962 u32 c;
963
964 for (; size >= 4; size -= 4) {
965 c = be32_to_cpu(*--b) + 1;
966 *b = cpu_to_be32(c);
967 if (c)
968 return;
969 }
970
971 crypto_inc_byte(a, size);
972 }
973 EXPORT_SYMBOL_GPL(crypto_inc);
974
975 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
976 {
977 for (; size; size--)
978 *a++ ^= *b++;
979 }
980
981 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
982 {
983 u32 *a = (u32 *)dst;
984 u32 *b = (u32 *)src;
985
986 for (; size >= 4; size -= 4)
987 *a++ ^= *b++;
988
989 crypto_xor_byte((u8 *)a, (u8 *)b, size);
990 }
991 EXPORT_SYMBOL_GPL(crypto_xor);
992
993 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
994 {
995 return alg->cra_ctxsize +
996 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
997 }
998 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
999
1000 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1001 u32 type, u32 mask)
1002 {
1003 int ret = 0;
1004 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1005
1006 if (!IS_ERR(alg)) {
1007 crypto_mod_put(alg);
1008 ret = 1;
1009 }
1010
1011 return ret;
1012 }
1013 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1014
1015 static int __init crypto_algapi_init(void)
1016 {
1017 crypto_init_proc();
1018 return 0;
1019 }
1020
1021 static void __exit crypto_algapi_exit(void)
1022 {
1023 crypto_exit_proc();
1024 }
1025
1026 module_init(crypto_algapi_init);
1027 module_exit(crypto_algapi_exit);
1028
1029 MODULE_LICENSE("GPL");
1030 MODULE_DESCRIPTION("Cryptographic algorithms API");
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