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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/algapi.h>
9#include <linux/err.h>
10#include <linux/errno.h>
11#include <linux/fips.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/list.h>
15#include <linux/module.h>
16#include <linux/rtnetlink.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <linux/workqueue.h>
20
21#include "internal.h"
22
23static LIST_HEAD(crypto_template_list);
24
25static inline void crypto_check_module_sig(struct module *mod)
26{
27 if (fips_enabled && mod && !module_sig_ok(mod))
28 panic("Module %s signature verification failed in FIPS mode\n",
29 module_name(mod));
30}
31
32static int crypto_check_alg(struct crypto_alg *alg)
33{
34 crypto_check_module_sig(alg->cra_module);
35
36 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
37 return -EINVAL;
38
39 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
40 return -EINVAL;
41
42 /* General maximums for all algs. */
43 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
44 return -EINVAL;
45
46 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
47 return -EINVAL;
48
49 /* Lower maximums for specific alg types. */
50 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
51 CRYPTO_ALG_TYPE_CIPHER) {
52 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
53 return -EINVAL;
54
55 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
56 return -EINVAL;
57 }
58
59 if (alg->cra_priority < 0)
60 return -EINVAL;
61
62 refcount_set(&alg->cra_refcnt, 1);
63
64 return 0;
65}
66
67static void crypto_free_instance(struct crypto_instance *inst)
68{
69 inst->alg.cra_type->free(inst);
70}
71
72static void crypto_destroy_instance_workfn(struct work_struct *w)
73{
74 struct crypto_instance *inst = container_of(w, struct crypto_instance,
75 free_work);
76 struct crypto_template *tmpl = inst->tmpl;
77
78 crypto_free_instance(inst);
79 crypto_tmpl_put(tmpl);
80}
81
82static void crypto_destroy_instance(struct crypto_alg *alg)
83{
84 struct crypto_instance *inst = container_of(alg,
85 struct crypto_instance,
86 alg);
87
88 INIT_WORK(&inst->free_work, crypto_destroy_instance_workfn);
89 schedule_work(&inst->free_work);
90}
91
92/*
93 * This function adds a spawn to the list secondary_spawns which
94 * will be used at the end of crypto_remove_spawns to unregister
95 * instances, unless the spawn happens to be one that is depended
96 * on by the new algorithm (nalg in crypto_remove_spawns).
97 *
98 * This function is also responsible for resurrecting any algorithms
99 * in the dependency chain of nalg by unsetting n->dead.
100 */
101static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
102 struct list_head *stack,
103 struct list_head *top,
104 struct list_head *secondary_spawns)
105{
106 struct crypto_spawn *spawn, *n;
107
108 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
109 if (!spawn)
110 return NULL;
111
112 n = list_prev_entry(spawn, list);
113 list_move(&spawn->list, secondary_spawns);
114
115 if (list_is_last(&n->list, stack))
116 return top;
117
118 n = list_next_entry(n, list);
119 if (!spawn->dead)
120 n->dead = false;
121
122 return &n->inst->alg.cra_users;
123}
124
125static void crypto_remove_instance(struct crypto_instance *inst,
126 struct list_head *list)
127{
128 struct crypto_template *tmpl = inst->tmpl;
129
130 if (crypto_is_dead(&inst->alg))
131 return;
132
133 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
134
135 if (!tmpl || !crypto_tmpl_get(tmpl))
136 return;
137
138 list_move(&inst->alg.cra_list, list);
139 hlist_del(&inst->list);
140 inst->alg.cra_destroy = crypto_destroy_instance;
141
142 BUG_ON(!list_empty(&inst->alg.cra_users));
143}
144
145/*
146 * Given an algorithm alg, remove all algorithms that depend on it
147 * through spawns. If nalg is not null, then exempt any algorithms
148 * that is depended on by nalg. This is useful when nalg itself
149 * depends on alg.
150 */
151void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
152 struct crypto_alg *nalg)
153{
154 u32 new_type = (nalg ?: alg)->cra_flags;
155 struct crypto_spawn *spawn, *n;
156 LIST_HEAD(secondary_spawns);
157 struct list_head *spawns;
158 LIST_HEAD(stack);
159 LIST_HEAD(top);
160
161 spawns = &alg->cra_users;
162 list_for_each_entry_safe(spawn, n, spawns, list) {
163 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
164 continue;
165
166 list_move(&spawn->list, &top);
167 }
168
169 /*
170 * Perform a depth-first walk starting from alg through
171 * the cra_users tree. The list stack records the path
172 * from alg to the current spawn.
173 */
174 spawns = ⊤
175 do {
176 while (!list_empty(spawns)) {
177 struct crypto_instance *inst;
178
179 spawn = list_first_entry(spawns, struct crypto_spawn,
180 list);
181 inst = spawn->inst;
182
183 list_move(&spawn->list, &stack);
184 spawn->dead = !spawn->registered || &inst->alg != nalg;
185
186 if (!spawn->registered)
187 break;
188
189 BUG_ON(&inst->alg == alg);
190
191 if (&inst->alg == nalg)
192 break;
193
194 spawns = &inst->alg.cra_users;
195
196 /*
197 * Even if spawn->registered is true, the
198 * instance itself may still be unregistered.
199 * This is because it may have failed during
200 * registration. Therefore we still need to
201 * make the following test.
202 *
203 * We may encounter an unregistered instance here, since
204 * an instance's spawns are set up prior to the instance
205 * being registered. An unregistered instance will have
206 * NULL ->cra_users.next, since ->cra_users isn't
207 * properly initialized until registration. But an
208 * unregistered instance cannot have any users, so treat
209 * it the same as ->cra_users being empty.
210 */
211 if (spawns->next == NULL)
212 break;
213 }
214 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
215 &secondary_spawns)));
216
217 /*
218 * Remove all instances that are marked as dead. Also
219 * complete the resurrection of the others by moving them
220 * back to the cra_users list.
221 */
222 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
223 if (!spawn->dead)
224 list_move(&spawn->list, &spawn->alg->cra_users);
225 else if (spawn->registered)
226 crypto_remove_instance(spawn->inst, list);
227 }
228}
229EXPORT_SYMBOL_GPL(crypto_remove_spawns);
230
231static void crypto_alg_finish_registration(struct crypto_alg *alg,
232 struct list_head *algs_to_put)
233{
234 struct crypto_alg *q;
235
236 list_for_each_entry(q, &crypto_alg_list, cra_list) {
237 if (q == alg)
238 continue;
239
240 if (crypto_is_moribund(q))
241 continue;
242
243 if (crypto_is_larval(q))
244 continue;
245
246 if (strcmp(alg->cra_name, q->cra_name))
247 continue;
248
249 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
250 q->cra_priority > alg->cra_priority)
251 continue;
252
253 crypto_remove_spawns(q, algs_to_put, alg);
254 }
255
256 crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
257}
258
259static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
260{
261 struct crypto_larval *larval;
262
263 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
264 IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
265 (alg->cra_flags & CRYPTO_ALG_INTERNAL))
266 return NULL; /* No self-test needed */
267
268 larval = crypto_larval_alloc(alg->cra_name,
269 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
270 if (IS_ERR(larval))
271 return larval;
272
273 larval->adult = crypto_mod_get(alg);
274 if (!larval->adult) {
275 kfree(larval);
276 return ERR_PTR(-ENOENT);
277 }
278
279 refcount_set(&larval->alg.cra_refcnt, 1);
280 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
281 CRYPTO_MAX_ALG_NAME);
282 larval->alg.cra_priority = alg->cra_priority;
283
284 return larval;
285}
286
287static struct crypto_larval *
288__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
289{
290 struct crypto_alg *q;
291 struct crypto_larval *larval;
292 int ret = -EAGAIN;
293
294 if (crypto_is_dead(alg))
295 goto err;
296
297 INIT_LIST_HEAD(&alg->cra_users);
298
299 ret = -EEXIST;
300
301 list_for_each_entry(q, &crypto_alg_list, cra_list) {
302 if (q == alg)
303 goto err;
304
305 if (crypto_is_moribund(q))
306 continue;
307
308 if (crypto_is_larval(q)) {
309 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
310 goto err;
311 continue;
312 }
313
314 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
315 !strcmp(q->cra_driver_name, alg->cra_driver_name) ||
316 !strcmp(q->cra_name, alg->cra_driver_name))
317 goto err;
318 }
319
320 larval = crypto_alloc_test_larval(alg);
321 if (IS_ERR(larval))
322 goto out;
323
324 list_add(&alg->cra_list, &crypto_alg_list);
325
326 if (larval) {
327 /* No cheating! */
328 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
329
330 list_add(&larval->alg.cra_list, &crypto_alg_list);
331 } else {
332 alg->cra_flags |= CRYPTO_ALG_TESTED;
333 crypto_alg_finish_registration(alg, algs_to_put);
334 }
335
336out:
337 return larval;
338
339err:
340 larval = ERR_PTR(ret);
341 goto out;
342}
343
344void crypto_alg_tested(const char *name, int err)
345{
346 struct crypto_larval *test;
347 struct crypto_alg *alg;
348 struct crypto_alg *q;
349 LIST_HEAD(list);
350
351 down_write(&crypto_alg_sem);
352 list_for_each_entry(q, &crypto_alg_list, cra_list) {
353 if (crypto_is_moribund(q) || !crypto_is_larval(q))
354 continue;
355
356 test = (struct crypto_larval *)q;
357
358 if (!strcmp(q->cra_driver_name, name))
359 goto found;
360 }
361
362 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
363 up_write(&crypto_alg_sem);
364 return;
365
366found:
367 q->cra_flags |= CRYPTO_ALG_DEAD;
368 alg = test->adult;
369
370 if (crypto_is_dead(alg))
371 goto complete;
372
373 if (err == -ECANCELED)
374 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
375 else if (err)
376 goto complete;
377 else
378 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
379
380 alg->cra_flags |= CRYPTO_ALG_TESTED;
381
382 crypto_alg_finish_registration(alg, &list);
383
384complete:
385 list_del_init(&test->alg.cra_list);
386 complete_all(&test->completion);
387
388 up_write(&crypto_alg_sem);
389
390 crypto_alg_put(&test->alg);
391 crypto_remove_final(&list);
392}
393EXPORT_SYMBOL_GPL(crypto_alg_tested);
394
395void crypto_remove_final(struct list_head *list)
396{
397 struct crypto_alg *alg;
398 struct crypto_alg *n;
399
400 list_for_each_entry_safe(alg, n, list, cra_list) {
401 list_del_init(&alg->cra_list);
402 crypto_alg_put(alg);
403 }
404}
405EXPORT_SYMBOL_GPL(crypto_remove_final);
406
407int crypto_register_alg(struct crypto_alg *alg)
408{
409 struct crypto_larval *larval;
410 LIST_HEAD(algs_to_put);
411 int err;
412
413 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
414 err = crypto_check_alg(alg);
415 if (err)
416 return err;
417
418 down_write(&crypto_alg_sem);
419 larval = __crypto_register_alg(alg, &algs_to_put);
420 if (!IS_ERR_OR_NULL(larval)) {
421 bool test_started = crypto_boot_test_finished();
422
423 larval->test_started = test_started;
424 if (test_started)
425 crypto_schedule_test(larval);
426 }
427 up_write(&crypto_alg_sem);
428
429 if (IS_ERR(larval))
430 return PTR_ERR(larval);
431 crypto_remove_final(&algs_to_put);
432 return 0;
433}
434EXPORT_SYMBOL_GPL(crypto_register_alg);
435
436static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
437{
438 if (unlikely(list_empty(&alg->cra_list)))
439 return -ENOENT;
440
441 alg->cra_flags |= CRYPTO_ALG_DEAD;
442
443 list_del_init(&alg->cra_list);
444 crypto_remove_spawns(alg, list, NULL);
445
446 return 0;
447}
448
449void crypto_unregister_alg(struct crypto_alg *alg)
450{
451 int ret;
452 LIST_HEAD(list);
453
454 down_write(&crypto_alg_sem);
455 ret = crypto_remove_alg(alg, &list);
456 up_write(&crypto_alg_sem);
457
458 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
459 return;
460
461 if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
462 return;
463
464 if (alg->cra_destroy)
465 alg->cra_destroy(alg);
466
467 crypto_remove_final(&list);
468}
469EXPORT_SYMBOL_GPL(crypto_unregister_alg);
470
471int crypto_register_algs(struct crypto_alg *algs, int count)
472{
473 int i, ret;
474
475 for (i = 0; i < count; i++) {
476 ret = crypto_register_alg(&algs[i]);
477 if (ret)
478 goto err;
479 }
480
481 return 0;
482
483err:
484 for (--i; i >= 0; --i)
485 crypto_unregister_alg(&algs[i]);
486
487 return ret;
488}
489EXPORT_SYMBOL_GPL(crypto_register_algs);
490
491void crypto_unregister_algs(struct crypto_alg *algs, int count)
492{
493 int i;
494
495 for (i = 0; i < count; i++)
496 crypto_unregister_alg(&algs[i]);
497}
498EXPORT_SYMBOL_GPL(crypto_unregister_algs);
499
500int crypto_register_template(struct crypto_template *tmpl)
501{
502 struct crypto_template *q;
503 int err = -EEXIST;
504
505 down_write(&crypto_alg_sem);
506
507 crypto_check_module_sig(tmpl->module);
508
509 list_for_each_entry(q, &crypto_template_list, list) {
510 if (q == tmpl)
511 goto out;
512 }
513
514 list_add(&tmpl->list, &crypto_template_list);
515 err = 0;
516out:
517 up_write(&crypto_alg_sem);
518 return err;
519}
520EXPORT_SYMBOL_GPL(crypto_register_template);
521
522int crypto_register_templates(struct crypto_template *tmpls, int count)
523{
524 int i, err;
525
526 for (i = 0; i < count; i++) {
527 err = crypto_register_template(&tmpls[i]);
528 if (err)
529 goto out;
530 }
531 return 0;
532
533out:
534 for (--i; i >= 0; --i)
535 crypto_unregister_template(&tmpls[i]);
536 return err;
537}
538EXPORT_SYMBOL_GPL(crypto_register_templates);
539
540void crypto_unregister_template(struct crypto_template *tmpl)
541{
542 struct crypto_instance *inst;
543 struct hlist_node *n;
544 struct hlist_head *list;
545 LIST_HEAD(users);
546
547 down_write(&crypto_alg_sem);
548
549 BUG_ON(list_empty(&tmpl->list));
550 list_del_init(&tmpl->list);
551
552 list = &tmpl->instances;
553 hlist_for_each_entry(inst, list, list) {
554 int err = crypto_remove_alg(&inst->alg, &users);
555
556 BUG_ON(err);
557 }
558
559 up_write(&crypto_alg_sem);
560
561 hlist_for_each_entry_safe(inst, n, list, list) {
562 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
563 crypto_free_instance(inst);
564 }
565 crypto_remove_final(&users);
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_template);
568
569void crypto_unregister_templates(struct crypto_template *tmpls, int count)
570{
571 int i;
572
573 for (i = count - 1; i >= 0; --i)
574 crypto_unregister_template(&tmpls[i]);
575}
576EXPORT_SYMBOL_GPL(crypto_unregister_templates);
577
578static struct crypto_template *__crypto_lookup_template(const char *name)
579{
580 struct crypto_template *q, *tmpl = NULL;
581
582 down_read(&crypto_alg_sem);
583 list_for_each_entry(q, &crypto_template_list, list) {
584 if (strcmp(q->name, name))
585 continue;
586 if (unlikely(!crypto_tmpl_get(q)))
587 continue;
588
589 tmpl = q;
590 break;
591 }
592 up_read(&crypto_alg_sem);
593
594 return tmpl;
595}
596
597struct crypto_template *crypto_lookup_template(const char *name)
598{
599 return try_then_request_module(__crypto_lookup_template(name),
600 "crypto-%s", name);
601}
602EXPORT_SYMBOL_GPL(crypto_lookup_template);
603
604int crypto_register_instance(struct crypto_template *tmpl,
605 struct crypto_instance *inst)
606{
607 struct crypto_larval *larval;
608 struct crypto_spawn *spawn;
609 u32 fips_internal = 0;
610 LIST_HEAD(algs_to_put);
611 int err;
612
613 err = crypto_check_alg(&inst->alg);
614 if (err)
615 return err;
616
617 inst->alg.cra_module = tmpl->module;
618 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
619
620 down_write(&crypto_alg_sem);
621
622 larval = ERR_PTR(-EAGAIN);
623 for (spawn = inst->spawns; spawn;) {
624 struct crypto_spawn *next;
625
626 if (spawn->dead)
627 goto unlock;
628
629 next = spawn->next;
630 spawn->inst = inst;
631 spawn->registered = true;
632
633 fips_internal |= spawn->alg->cra_flags;
634
635 crypto_mod_put(spawn->alg);
636
637 spawn = next;
638 }
639
640 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
641
642 larval = __crypto_register_alg(&inst->alg, &algs_to_put);
643 if (IS_ERR(larval))
644 goto unlock;
645 else if (larval) {
646 larval->test_started = true;
647 crypto_schedule_test(larval);
648 }
649
650 hlist_add_head(&inst->list, &tmpl->instances);
651 inst->tmpl = tmpl;
652
653unlock:
654 up_write(&crypto_alg_sem);
655
656 if (IS_ERR(larval))
657 return PTR_ERR(larval);
658 crypto_remove_final(&algs_to_put);
659 return 0;
660}
661EXPORT_SYMBOL_GPL(crypto_register_instance);
662
663void crypto_unregister_instance(struct crypto_instance *inst)
664{
665 LIST_HEAD(list);
666
667 down_write(&crypto_alg_sem);
668
669 crypto_remove_spawns(&inst->alg, &list, NULL);
670 crypto_remove_instance(inst, &list);
671
672 up_write(&crypto_alg_sem);
673
674 crypto_remove_final(&list);
675}
676EXPORT_SYMBOL_GPL(crypto_unregister_instance);
677
678int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
679 const char *name, u32 type, u32 mask)
680{
681 struct crypto_alg *alg;
682 int err = -EAGAIN;
683
684 if (WARN_ON_ONCE(inst == NULL))
685 return -EINVAL;
686
687 /* Allow the result of crypto_attr_alg_name() to be passed directly */
688 if (IS_ERR(name))
689 return PTR_ERR(name);
690
691 alg = crypto_find_alg(name, spawn->frontend,
692 type | CRYPTO_ALG_FIPS_INTERNAL, mask);
693 if (IS_ERR(alg))
694 return PTR_ERR(alg);
695
696 down_write(&crypto_alg_sem);
697 if (!crypto_is_moribund(alg)) {
698 list_add(&spawn->list, &alg->cra_users);
699 spawn->alg = alg;
700 spawn->mask = mask;
701 spawn->next = inst->spawns;
702 inst->spawns = spawn;
703 inst->alg.cra_flags |=
704 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
705 err = 0;
706 }
707 up_write(&crypto_alg_sem);
708 if (err)
709 crypto_mod_put(alg);
710 return err;
711}
712EXPORT_SYMBOL_GPL(crypto_grab_spawn);
713
714void crypto_drop_spawn(struct crypto_spawn *spawn)
715{
716 if (!spawn->alg) /* not yet initialized? */
717 return;
718
719 down_write(&crypto_alg_sem);
720 if (!spawn->dead)
721 list_del(&spawn->list);
722 up_write(&crypto_alg_sem);
723
724 if (!spawn->registered)
725 crypto_mod_put(spawn->alg);
726}
727EXPORT_SYMBOL_GPL(crypto_drop_spawn);
728
729static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
730{
731 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
732 struct crypto_alg *target;
733 bool shoot = false;
734
735 down_read(&crypto_alg_sem);
736 if (!spawn->dead) {
737 alg = spawn->alg;
738 if (!crypto_mod_get(alg)) {
739 target = crypto_alg_get(alg);
740 shoot = true;
741 alg = ERR_PTR(-EAGAIN);
742 }
743 }
744 up_read(&crypto_alg_sem);
745
746 if (shoot) {
747 crypto_shoot_alg(target);
748 crypto_alg_put(target);
749 }
750
751 return alg;
752}
753
754struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
755 u32 mask)
756{
757 struct crypto_alg *alg;
758 struct crypto_tfm *tfm;
759
760 alg = crypto_spawn_alg(spawn);
761 if (IS_ERR(alg))
762 return ERR_CAST(alg);
763
764 tfm = ERR_PTR(-EINVAL);
765 if (unlikely((alg->cra_flags ^ type) & mask))
766 goto out_put_alg;
767
768 tfm = __crypto_alloc_tfm(alg, type, mask);
769 if (IS_ERR(tfm))
770 goto out_put_alg;
771
772 return tfm;
773
774out_put_alg:
775 crypto_mod_put(alg);
776 return tfm;
777}
778EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
779
780void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
781{
782 struct crypto_alg *alg;
783 struct crypto_tfm *tfm;
784
785 alg = crypto_spawn_alg(spawn);
786 if (IS_ERR(alg))
787 return ERR_CAST(alg);
788
789 tfm = crypto_create_tfm(alg, spawn->frontend);
790 if (IS_ERR(tfm))
791 goto out_put_alg;
792
793 return tfm;
794
795out_put_alg:
796 crypto_mod_put(alg);
797 return tfm;
798}
799EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
800
801int crypto_register_notifier(struct notifier_block *nb)
802{
803 return blocking_notifier_chain_register(&crypto_chain, nb);
804}
805EXPORT_SYMBOL_GPL(crypto_register_notifier);
806
807int crypto_unregister_notifier(struct notifier_block *nb)
808{
809 return blocking_notifier_chain_unregister(&crypto_chain, nb);
810}
811EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
812
813struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
814{
815 struct rtattr *rta = tb[0];
816 struct crypto_attr_type *algt;
817
818 if (!rta)
819 return ERR_PTR(-ENOENT);
820 if (RTA_PAYLOAD(rta) < sizeof(*algt))
821 return ERR_PTR(-EINVAL);
822 if (rta->rta_type != CRYPTOA_TYPE)
823 return ERR_PTR(-EINVAL);
824
825 algt = RTA_DATA(rta);
826
827 return algt;
828}
829EXPORT_SYMBOL_GPL(crypto_get_attr_type);
830
831/**
832 * crypto_check_attr_type() - check algorithm type and compute inherited mask
833 * @tb: the template parameters
834 * @type: the algorithm type the template would be instantiated as
835 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
836 * to restrict the flags of any inner algorithms
837 *
838 * Validate that the algorithm type the user requested is compatible with the
839 * one the template would actually be instantiated as. E.g., if the user is
840 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
841 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
842 *
843 * Also compute the mask to use to restrict the flags of any inner algorithms.
844 *
845 * Return: 0 on success; -errno on failure
846 */
847int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
848{
849 struct crypto_attr_type *algt;
850
851 algt = crypto_get_attr_type(tb);
852 if (IS_ERR(algt))
853 return PTR_ERR(algt);
854
855 if ((algt->type ^ type) & algt->mask)
856 return -EINVAL;
857
858 *mask_ret = crypto_algt_inherited_mask(algt);
859 return 0;
860}
861EXPORT_SYMBOL_GPL(crypto_check_attr_type);
862
863const char *crypto_attr_alg_name(struct rtattr *rta)
864{
865 struct crypto_attr_alg *alga;
866
867 if (!rta)
868 return ERR_PTR(-ENOENT);
869 if (RTA_PAYLOAD(rta) < sizeof(*alga))
870 return ERR_PTR(-EINVAL);
871 if (rta->rta_type != CRYPTOA_ALG)
872 return ERR_PTR(-EINVAL);
873
874 alga = RTA_DATA(rta);
875 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
876
877 return alga->name;
878}
879EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
880
881int crypto_inst_setname(struct crypto_instance *inst, const char *name,
882 struct crypto_alg *alg)
883{
884 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
885 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
886 return -ENAMETOOLONG;
887
888 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
889 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
890 return -ENAMETOOLONG;
891
892 return 0;
893}
894EXPORT_SYMBOL_GPL(crypto_inst_setname);
895
896void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
897{
898 INIT_LIST_HEAD(&queue->list);
899 queue->backlog = &queue->list;
900 queue->qlen = 0;
901 queue->max_qlen = max_qlen;
902}
903EXPORT_SYMBOL_GPL(crypto_init_queue);
904
905int crypto_enqueue_request(struct crypto_queue *queue,
906 struct crypto_async_request *request)
907{
908 int err = -EINPROGRESS;
909
910 if (unlikely(queue->qlen >= queue->max_qlen)) {
911 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
912 err = -ENOSPC;
913 goto out;
914 }
915 err = -EBUSY;
916 if (queue->backlog == &queue->list)
917 queue->backlog = &request->list;
918 }
919
920 queue->qlen++;
921 list_add_tail(&request->list, &queue->list);
922
923out:
924 return err;
925}
926EXPORT_SYMBOL_GPL(crypto_enqueue_request);
927
928void crypto_enqueue_request_head(struct crypto_queue *queue,
929 struct crypto_async_request *request)
930{
931 if (unlikely(queue->qlen >= queue->max_qlen))
932 queue->backlog = queue->backlog->prev;
933
934 queue->qlen++;
935 list_add(&request->list, &queue->list);
936}
937EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
938
939struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
940{
941 struct list_head *request;
942
943 if (unlikely(!queue->qlen))
944 return NULL;
945
946 queue->qlen--;
947
948 if (queue->backlog != &queue->list)
949 queue->backlog = queue->backlog->next;
950
951 request = queue->list.next;
952 list_del(request);
953
954 return list_entry(request, struct crypto_async_request, list);
955}
956EXPORT_SYMBOL_GPL(crypto_dequeue_request);
957
958static inline void crypto_inc_byte(u8 *a, unsigned int size)
959{
960 u8 *b = (a + size);
961 u8 c;
962
963 for (; size; size--) {
964 c = *--b + 1;
965 *b = c;
966 if (c)
967 break;
968 }
969}
970
971void crypto_inc(u8 *a, unsigned int size)
972{
973 __be32 *b = (__be32 *)(a + size);
974 u32 c;
975
976 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
977 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
978 for (; size >= 4; size -= 4) {
979 c = be32_to_cpu(*--b) + 1;
980 *b = cpu_to_be32(c);
981 if (likely(c))
982 return;
983 }
984
985 crypto_inc_byte(a, size);
986}
987EXPORT_SYMBOL_GPL(crypto_inc);
988
989unsigned int crypto_alg_extsize(struct crypto_alg *alg)
990{
991 return alg->cra_ctxsize +
992 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
993}
994EXPORT_SYMBOL_GPL(crypto_alg_extsize);
995
996int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
997 u32 type, u32 mask)
998{
999 int ret = 0;
1000 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1001
1002 if (!IS_ERR(alg)) {
1003 crypto_mod_put(alg);
1004 ret = 1;
1005 }
1006
1007 return ret;
1008}
1009EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1010
1011static void __init crypto_start_tests(void)
1012{
1013 if (!IS_BUILTIN(CONFIG_CRYPTO_ALGAPI))
1014 return;
1015
1016 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1017 return;
1018
1019 set_crypto_boot_test_finished();
1020
1021 for (;;) {
1022 struct crypto_larval *larval = NULL;
1023 struct crypto_alg *q;
1024
1025 down_write(&crypto_alg_sem);
1026
1027 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1028 struct crypto_larval *l;
1029
1030 if (!crypto_is_larval(q))
1031 continue;
1032
1033 l = (void *)q;
1034
1035 if (!crypto_is_test_larval(l))
1036 continue;
1037
1038 if (l->test_started)
1039 continue;
1040
1041 l->test_started = true;
1042 larval = l;
1043 crypto_schedule_test(larval);
1044 break;
1045 }
1046
1047 up_write(&crypto_alg_sem);
1048
1049 if (!larval)
1050 break;
1051 }
1052}
1053
1054static int __init crypto_algapi_init(void)
1055{
1056 crypto_init_proc();
1057 crypto_start_tests();
1058 return 0;
1059}
1060
1061static void __exit crypto_algapi_exit(void)
1062{
1063 crypto_exit_proc();
1064}
1065
1066/*
1067 * We run this at late_initcall so that all the built-in algorithms
1068 * have had a chance to register themselves first.
1069 */
1070late_initcall(crypto_algapi_init);
1071module_exit(crypto_algapi_exit);
1072
1073MODULE_LICENSE("GPL");
1074MODULE_DESCRIPTION("Cryptographic algorithms API");
1075MODULE_SOFTDEP("pre: cryptomgr");
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");