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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
20#include "internal.h"
21
22static LIST_HEAD(crypto_template_list);
23
24static inline void crypto_check_module_sig(struct module *mod)
25{
26 if (fips_enabled && mod && !module_sig_ok(mod))
27 panic("Module %s signature verification failed in FIPS mode\n",
28 module_name(mod));
29}
30
31static int crypto_check_alg(struct crypto_alg *alg)
32{
33 crypto_check_module_sig(alg->cra_module);
34
35 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
36 return -EINVAL;
37
38 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
39 return -EINVAL;
40
41 /* General maximums for all algs. */
42 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
43 return -EINVAL;
44
45 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
46 return -EINVAL;
47
48 /* Lower maximums for specific alg types. */
49 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
50 CRYPTO_ALG_TYPE_CIPHER) {
51 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
52 return -EINVAL;
53
54 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
55 return -EINVAL;
56 }
57
58 if (alg->cra_priority < 0)
59 return -EINVAL;
60
61 refcount_set(&alg->cra_refcnt, 1);
62
63 return 0;
64}
65
66static void crypto_free_instance(struct crypto_instance *inst)
67{
68 if (!inst->alg.cra_type->free) {
69 inst->tmpl->free(inst);
70 return;
71 }
72
73 inst->alg.cra_type->free(inst);
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 crypto_free_instance(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 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
93 if (!spawn)
94 return NULL;
95
96 n = list_next_entry(spawn, list);
97
98 if (spawn->alg && &n->list != stack && !n->alg)
99 n->alg = (n->list.next == stack) ? alg :
100 &list_next_entry(n, list)->inst->alg;
101
102 list_move(&spawn->list, secondary_spawns);
103
104 return &n->list == stack ? top : &n->inst->alg.cra_users;
105}
106
107static void crypto_remove_instance(struct crypto_instance *inst,
108 struct list_head *list)
109{
110 struct crypto_template *tmpl = inst->tmpl;
111
112 if (crypto_is_dead(&inst->alg))
113 return;
114
115 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
116 if (hlist_unhashed(&inst->list))
117 return;
118
119 if (!tmpl || !crypto_tmpl_get(tmpl))
120 return;
121
122 list_move(&inst->alg.cra_list, list);
123 hlist_del(&inst->list);
124 inst->alg.cra_destroy = crypto_destroy_instance;
125
126 BUG_ON(!list_empty(&inst->alg.cra_users));
127}
128
129void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
130 struct crypto_alg *nalg)
131{
132 u32 new_type = (nalg ?: alg)->cra_flags;
133 struct crypto_spawn *spawn, *n;
134 LIST_HEAD(secondary_spawns);
135 struct list_head *spawns;
136 LIST_HEAD(stack);
137 LIST_HEAD(top);
138
139 spawns = &alg->cra_users;
140 list_for_each_entry_safe(spawn, n, spawns, list) {
141 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
142 continue;
143
144 list_move(&spawn->list, &top);
145 }
146
147 spawns = ⊤
148 do {
149 while (!list_empty(spawns)) {
150 struct crypto_instance *inst;
151
152 spawn = list_first_entry(spawns, struct crypto_spawn,
153 list);
154 inst = spawn->inst;
155
156 BUG_ON(&inst->alg == alg);
157
158 list_move(&spawn->list, &stack);
159
160 if (&inst->alg == nalg)
161 break;
162
163 spawn->alg = NULL;
164 spawns = &inst->alg.cra_users;
165
166 /*
167 * We may encounter an unregistered instance here, since
168 * an instance's spawns are set up prior to the instance
169 * being registered. An unregistered instance will have
170 * NULL ->cra_users.next, since ->cra_users isn't
171 * properly initialized until registration. But an
172 * unregistered instance cannot have any users, so treat
173 * it the same as ->cra_users being empty.
174 */
175 if (spawns->next == NULL)
176 break;
177 }
178 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
179 &secondary_spawns)));
180
181 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
182 if (spawn->alg)
183 list_move(&spawn->list, &spawn->alg->cra_users);
184 else
185 crypto_remove_instance(spawn->inst, list);
186 }
187}
188EXPORT_SYMBOL_GPL(crypto_remove_spawns);
189
190static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
191{
192 struct crypto_alg *q;
193 struct crypto_larval *larval;
194 int ret = -EAGAIN;
195
196 if (crypto_is_dead(alg))
197 goto err;
198
199 INIT_LIST_HEAD(&alg->cra_users);
200
201 /* No cheating! */
202 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
203
204 ret = -EEXIST;
205
206 list_for_each_entry(q, &crypto_alg_list, cra_list) {
207 if (q == alg)
208 goto err;
209
210 if (crypto_is_moribund(q))
211 continue;
212
213 if (crypto_is_larval(q)) {
214 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
215 goto err;
216 continue;
217 }
218
219 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
220 !strcmp(q->cra_name, alg->cra_driver_name))
221 goto err;
222 }
223
224 larval = crypto_larval_alloc(alg->cra_name,
225 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
226 if (IS_ERR(larval))
227 goto out;
228
229 ret = -ENOENT;
230 larval->adult = crypto_mod_get(alg);
231 if (!larval->adult)
232 goto free_larval;
233
234 refcount_set(&larval->alg.cra_refcnt, 1);
235 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
236 CRYPTO_MAX_ALG_NAME);
237 larval->alg.cra_priority = alg->cra_priority;
238
239 list_add(&alg->cra_list, &crypto_alg_list);
240 list_add(&larval->alg.cra_list, &crypto_alg_list);
241
242 crypto_stats_init(alg);
243
244out:
245 return larval;
246
247free_larval:
248 kfree(larval);
249err:
250 larval = ERR_PTR(ret);
251 goto out;
252}
253
254void crypto_alg_tested(const char *name, int err)
255{
256 struct crypto_larval *test;
257 struct crypto_alg *alg;
258 struct crypto_alg *q;
259 LIST_HEAD(list);
260
261 down_write(&crypto_alg_sem);
262 list_for_each_entry(q, &crypto_alg_list, cra_list) {
263 if (crypto_is_moribund(q) || !crypto_is_larval(q))
264 continue;
265
266 test = (struct crypto_larval *)q;
267
268 if (!strcmp(q->cra_driver_name, name))
269 goto found;
270 }
271
272 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
273 goto unlock;
274
275found:
276 q->cra_flags |= CRYPTO_ALG_DEAD;
277 alg = test->adult;
278 if (err || list_empty(&alg->cra_list))
279 goto complete;
280
281 alg->cra_flags |= CRYPTO_ALG_TESTED;
282
283 list_for_each_entry(q, &crypto_alg_list, cra_list) {
284 if (q == alg)
285 continue;
286
287 if (crypto_is_moribund(q))
288 continue;
289
290 if (crypto_is_larval(q)) {
291 struct crypto_larval *larval = (void *)q;
292
293 /*
294 * Check to see if either our generic name or
295 * specific name can satisfy the name requested
296 * by the larval entry q.
297 */
298 if (strcmp(alg->cra_name, q->cra_name) &&
299 strcmp(alg->cra_driver_name, q->cra_name))
300 continue;
301
302 if (larval->adult)
303 continue;
304 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
305 continue;
306 if (!crypto_mod_get(alg))
307 continue;
308
309 larval->adult = alg;
310 continue;
311 }
312
313 if (strcmp(alg->cra_name, q->cra_name))
314 continue;
315
316 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
317 q->cra_priority > alg->cra_priority)
318 continue;
319
320 crypto_remove_spawns(q, &list, alg);
321 }
322
323complete:
324 complete_all(&test->completion);
325
326unlock:
327 up_write(&crypto_alg_sem);
328
329 crypto_remove_final(&list);
330}
331EXPORT_SYMBOL_GPL(crypto_alg_tested);
332
333void crypto_remove_final(struct list_head *list)
334{
335 struct crypto_alg *alg;
336 struct crypto_alg *n;
337
338 list_for_each_entry_safe(alg, n, list, cra_list) {
339 list_del_init(&alg->cra_list);
340 crypto_alg_put(alg);
341 }
342}
343EXPORT_SYMBOL_GPL(crypto_remove_final);
344
345static void crypto_wait_for_test(struct crypto_larval *larval)
346{
347 int err;
348
349 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
350 if (err != NOTIFY_STOP) {
351 if (WARN_ON(err != NOTIFY_DONE))
352 goto out;
353 crypto_alg_tested(larval->alg.cra_driver_name, 0);
354 }
355
356 err = wait_for_completion_killable(&larval->completion);
357 WARN_ON(err);
358 if (!err)
359 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
360
361out:
362 crypto_larval_kill(&larval->alg);
363}
364
365int crypto_register_alg(struct crypto_alg *alg)
366{
367 struct crypto_larval *larval;
368 int err;
369
370 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
371 err = crypto_check_alg(alg);
372 if (err)
373 return err;
374
375 down_write(&crypto_alg_sem);
376 larval = __crypto_register_alg(alg);
377 up_write(&crypto_alg_sem);
378
379 if (IS_ERR(larval))
380 return PTR_ERR(larval);
381
382 crypto_wait_for_test(larval);
383 return 0;
384}
385EXPORT_SYMBOL_GPL(crypto_register_alg);
386
387static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
388{
389 if (unlikely(list_empty(&alg->cra_list)))
390 return -ENOENT;
391
392 alg->cra_flags |= CRYPTO_ALG_DEAD;
393
394 list_del_init(&alg->cra_list);
395 crypto_remove_spawns(alg, list, NULL);
396
397 return 0;
398}
399
400int crypto_unregister_alg(struct crypto_alg *alg)
401{
402 int ret;
403 LIST_HEAD(list);
404
405 down_write(&crypto_alg_sem);
406 ret = crypto_remove_alg(alg, &list);
407 up_write(&crypto_alg_sem);
408
409 if (ret)
410 return ret;
411
412 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
413 if (alg->cra_destroy)
414 alg->cra_destroy(alg);
415
416 crypto_remove_final(&list);
417 return 0;
418}
419EXPORT_SYMBOL_GPL(crypto_unregister_alg);
420
421int crypto_register_algs(struct crypto_alg *algs, int count)
422{
423 int i, ret;
424
425 for (i = 0; i < count; i++) {
426 ret = crypto_register_alg(&algs[i]);
427 if (ret)
428 goto err;
429 }
430
431 return 0;
432
433err:
434 for (--i; i >= 0; --i)
435 crypto_unregister_alg(&algs[i]);
436
437 return ret;
438}
439EXPORT_SYMBOL_GPL(crypto_register_algs);
440
441int crypto_unregister_algs(struct crypto_alg *algs, int count)
442{
443 int i, ret;
444
445 for (i = 0; i < count; i++) {
446 ret = crypto_unregister_alg(&algs[i]);
447 if (ret)
448 pr_err("Failed to unregister %s %s: %d\n",
449 algs[i].cra_driver_name, algs[i].cra_name, ret);
450 }
451
452 return 0;
453}
454EXPORT_SYMBOL_GPL(crypto_unregister_algs);
455
456int crypto_register_template(struct crypto_template *tmpl)
457{
458 struct crypto_template *q;
459 int err = -EEXIST;
460
461 down_write(&crypto_alg_sem);
462
463 crypto_check_module_sig(tmpl->module);
464
465 list_for_each_entry(q, &crypto_template_list, list) {
466 if (q == tmpl)
467 goto out;
468 }
469
470 list_add(&tmpl->list, &crypto_template_list);
471 err = 0;
472out:
473 up_write(&crypto_alg_sem);
474 return err;
475}
476EXPORT_SYMBOL_GPL(crypto_register_template);
477
478int crypto_register_templates(struct crypto_template *tmpls, int count)
479{
480 int i, err;
481
482 for (i = 0; i < count; i++) {
483 err = crypto_register_template(&tmpls[i]);
484 if (err)
485 goto out;
486 }
487 return 0;
488
489out:
490 for (--i; i >= 0; --i)
491 crypto_unregister_template(&tmpls[i]);
492 return err;
493}
494EXPORT_SYMBOL_GPL(crypto_register_templates);
495
496void crypto_unregister_template(struct crypto_template *tmpl)
497{
498 struct crypto_instance *inst;
499 struct hlist_node *n;
500 struct hlist_head *list;
501 LIST_HEAD(users);
502
503 down_write(&crypto_alg_sem);
504
505 BUG_ON(list_empty(&tmpl->list));
506 list_del_init(&tmpl->list);
507
508 list = &tmpl->instances;
509 hlist_for_each_entry(inst, list, list) {
510 int err = crypto_remove_alg(&inst->alg, &users);
511
512 BUG_ON(err);
513 }
514
515 up_write(&crypto_alg_sem);
516
517 hlist_for_each_entry_safe(inst, n, list, list) {
518 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
519 crypto_free_instance(inst);
520 }
521 crypto_remove_final(&users);
522}
523EXPORT_SYMBOL_GPL(crypto_unregister_template);
524
525void crypto_unregister_templates(struct crypto_template *tmpls, int count)
526{
527 int i;
528
529 for (i = count - 1; i >= 0; --i)
530 crypto_unregister_template(&tmpls[i]);
531}
532EXPORT_SYMBOL_GPL(crypto_unregister_templates);
533
534static struct crypto_template *__crypto_lookup_template(const char *name)
535{
536 struct crypto_template *q, *tmpl = NULL;
537
538 down_read(&crypto_alg_sem);
539 list_for_each_entry(q, &crypto_template_list, list) {
540 if (strcmp(q->name, name))
541 continue;
542 if (unlikely(!crypto_tmpl_get(q)))
543 continue;
544
545 tmpl = q;
546 break;
547 }
548 up_read(&crypto_alg_sem);
549
550 return tmpl;
551}
552
553struct crypto_template *crypto_lookup_template(const char *name)
554{
555 return try_then_request_module(__crypto_lookup_template(name),
556 "crypto-%s", name);
557}
558EXPORT_SYMBOL_GPL(crypto_lookup_template);
559
560int crypto_register_instance(struct crypto_template *tmpl,
561 struct crypto_instance *inst)
562{
563 struct crypto_larval *larval;
564 int err;
565
566 err = crypto_check_alg(&inst->alg);
567 if (err)
568 return err;
569
570 inst->alg.cra_module = tmpl->module;
571 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
572
573 down_write(&crypto_alg_sem);
574
575 larval = __crypto_register_alg(&inst->alg);
576 if (IS_ERR(larval))
577 goto unlock;
578
579 hlist_add_head(&inst->list, &tmpl->instances);
580 inst->tmpl = tmpl;
581
582unlock:
583 up_write(&crypto_alg_sem);
584
585 err = PTR_ERR(larval);
586 if (IS_ERR(larval))
587 goto err;
588
589 crypto_wait_for_test(larval);
590 err = 0;
591
592err:
593 return err;
594}
595EXPORT_SYMBOL_GPL(crypto_register_instance);
596
597int crypto_unregister_instance(struct crypto_instance *inst)
598{
599 LIST_HEAD(list);
600
601 down_write(&crypto_alg_sem);
602
603 crypto_remove_spawns(&inst->alg, &list, NULL);
604 crypto_remove_instance(inst, &list);
605
606 up_write(&crypto_alg_sem);
607
608 crypto_remove_final(&list);
609
610 return 0;
611}
612EXPORT_SYMBOL_GPL(crypto_unregister_instance);
613
614int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
615 struct crypto_instance *inst, u32 mask)
616{
617 int err = -EAGAIN;
618
619 if (WARN_ON_ONCE(inst == NULL))
620 return -EINVAL;
621
622 spawn->inst = inst;
623 spawn->mask = mask;
624
625 down_write(&crypto_alg_sem);
626 if (!crypto_is_moribund(alg)) {
627 list_add(&spawn->list, &alg->cra_users);
628 spawn->alg = alg;
629 err = 0;
630 }
631 up_write(&crypto_alg_sem);
632
633 return err;
634}
635EXPORT_SYMBOL_GPL(crypto_init_spawn);
636
637int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
638 struct crypto_instance *inst,
639 const struct crypto_type *frontend)
640{
641 int err = -EINVAL;
642
643 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
644 goto out;
645
646 spawn->frontend = frontend;
647 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
648
649out:
650 return err;
651}
652EXPORT_SYMBOL_GPL(crypto_init_spawn2);
653
654int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
655 u32 type, u32 mask)
656{
657 struct crypto_alg *alg;
658 int err;
659
660 alg = crypto_find_alg(name, spawn->frontend, type, mask);
661 if (IS_ERR(alg))
662 return PTR_ERR(alg);
663
664 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
665 crypto_mod_put(alg);
666 return err;
667}
668EXPORT_SYMBOL_GPL(crypto_grab_spawn);
669
670void crypto_drop_spawn(struct crypto_spawn *spawn)
671{
672 if (!spawn->alg)
673 return;
674
675 down_write(&crypto_alg_sem);
676 list_del(&spawn->list);
677 up_write(&crypto_alg_sem);
678}
679EXPORT_SYMBOL_GPL(crypto_drop_spawn);
680
681static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
682{
683 struct crypto_alg *alg;
684 struct crypto_alg *alg2;
685
686 down_read(&crypto_alg_sem);
687 alg = spawn->alg;
688 alg2 = alg;
689 if (alg2)
690 alg2 = crypto_mod_get(alg2);
691 up_read(&crypto_alg_sem);
692
693 if (!alg2) {
694 if (alg)
695 crypto_shoot_alg(alg);
696 return ERR_PTR(-EAGAIN);
697 }
698
699 return alg;
700}
701
702struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
703 u32 mask)
704{
705 struct crypto_alg *alg;
706 struct crypto_tfm *tfm;
707
708 alg = crypto_spawn_alg(spawn);
709 if (IS_ERR(alg))
710 return ERR_CAST(alg);
711
712 tfm = ERR_PTR(-EINVAL);
713 if (unlikely((alg->cra_flags ^ type) & mask))
714 goto out_put_alg;
715
716 tfm = __crypto_alloc_tfm(alg, type, mask);
717 if (IS_ERR(tfm))
718 goto out_put_alg;
719
720 return tfm;
721
722out_put_alg:
723 crypto_mod_put(alg);
724 return tfm;
725}
726EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
727
728void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
729{
730 struct crypto_alg *alg;
731 struct crypto_tfm *tfm;
732
733 alg = crypto_spawn_alg(spawn);
734 if (IS_ERR(alg))
735 return ERR_CAST(alg);
736
737 tfm = crypto_create_tfm(alg, spawn->frontend);
738 if (IS_ERR(tfm))
739 goto out_put_alg;
740
741 return tfm;
742
743out_put_alg:
744 crypto_mod_put(alg);
745 return tfm;
746}
747EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
748
749int crypto_register_notifier(struct notifier_block *nb)
750{
751 return blocking_notifier_chain_register(&crypto_chain, nb);
752}
753EXPORT_SYMBOL_GPL(crypto_register_notifier);
754
755int crypto_unregister_notifier(struct notifier_block *nb)
756{
757 return blocking_notifier_chain_unregister(&crypto_chain, nb);
758}
759EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
760
761struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
762{
763 struct rtattr *rta = tb[0];
764 struct crypto_attr_type *algt;
765
766 if (!rta)
767 return ERR_PTR(-ENOENT);
768 if (RTA_PAYLOAD(rta) < sizeof(*algt))
769 return ERR_PTR(-EINVAL);
770 if (rta->rta_type != CRYPTOA_TYPE)
771 return ERR_PTR(-EINVAL);
772
773 algt = RTA_DATA(rta);
774
775 return algt;
776}
777EXPORT_SYMBOL_GPL(crypto_get_attr_type);
778
779int crypto_check_attr_type(struct rtattr **tb, u32 type)
780{
781 struct crypto_attr_type *algt;
782
783 algt = crypto_get_attr_type(tb);
784 if (IS_ERR(algt))
785 return PTR_ERR(algt);
786
787 if ((algt->type ^ type) & algt->mask)
788 return -EINVAL;
789
790 return 0;
791}
792EXPORT_SYMBOL_GPL(crypto_check_attr_type);
793
794const char *crypto_attr_alg_name(struct rtattr *rta)
795{
796 struct crypto_attr_alg *alga;
797
798 if (!rta)
799 return ERR_PTR(-ENOENT);
800 if (RTA_PAYLOAD(rta) < sizeof(*alga))
801 return ERR_PTR(-EINVAL);
802 if (rta->rta_type != CRYPTOA_ALG)
803 return ERR_PTR(-EINVAL);
804
805 alga = RTA_DATA(rta);
806 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
807
808 return alga->name;
809}
810EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
811
812struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
813 const struct crypto_type *frontend,
814 u32 type, u32 mask)
815{
816 const char *name;
817
818 name = crypto_attr_alg_name(rta);
819 if (IS_ERR(name))
820 return ERR_CAST(name);
821
822 return crypto_find_alg(name, frontend, type, mask);
823}
824EXPORT_SYMBOL_GPL(crypto_attr_alg2);
825
826int crypto_attr_u32(struct rtattr *rta, u32 *num)
827{
828 struct crypto_attr_u32 *nu32;
829
830 if (!rta)
831 return -ENOENT;
832 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
833 return -EINVAL;
834 if (rta->rta_type != CRYPTOA_U32)
835 return -EINVAL;
836
837 nu32 = RTA_DATA(rta);
838 *num = nu32->num;
839
840 return 0;
841}
842EXPORT_SYMBOL_GPL(crypto_attr_u32);
843
844int crypto_inst_setname(struct crypto_instance *inst, const char *name,
845 struct crypto_alg *alg)
846{
847 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
848 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
849 return -ENAMETOOLONG;
850
851 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
852 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
853 return -ENAMETOOLONG;
854
855 return 0;
856}
857EXPORT_SYMBOL_GPL(crypto_inst_setname);
858
859void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
860 unsigned int head)
861{
862 struct crypto_instance *inst;
863 char *p;
864 int err;
865
866 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
867 GFP_KERNEL);
868 if (!p)
869 return ERR_PTR(-ENOMEM);
870
871 inst = (void *)(p + head);
872
873 err = crypto_inst_setname(inst, name, alg);
874 if (err)
875 goto err_free_inst;
876
877 return p;
878
879err_free_inst:
880 kfree(p);
881 return ERR_PTR(err);
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 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
901 err = -ENOSPC;
902 goto out;
903 }
904 err = -EBUSY;
905 if (queue->backlog == &queue->list)
906 queue->backlog = &request->list;
907 }
908
909 queue->qlen++;
910 list_add_tail(&request->list, &queue->list);
911
912out:
913 return err;
914}
915EXPORT_SYMBOL_GPL(crypto_enqueue_request);
916
917struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
918{
919 struct list_head *request;
920
921 if (unlikely(!queue->qlen))
922 return NULL;
923
924 queue->qlen--;
925
926 if (queue->backlog != &queue->list)
927 queue->backlog = queue->backlog->next;
928
929 request = queue->list.next;
930 list_del(request);
931
932 return list_entry(request, struct crypto_async_request, list);
933}
934EXPORT_SYMBOL_GPL(crypto_dequeue_request);
935
936static inline void crypto_inc_byte(u8 *a, unsigned int size)
937{
938 u8 *b = (a + size);
939 u8 c;
940
941 for (; size; size--) {
942 c = *--b + 1;
943 *b = c;
944 if (c)
945 break;
946 }
947}
948
949void crypto_inc(u8 *a, unsigned int size)
950{
951 __be32 *b = (__be32 *)(a + size);
952 u32 c;
953
954 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
955 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
956 for (; size >= 4; size -= 4) {
957 c = be32_to_cpu(*--b) + 1;
958 *b = cpu_to_be32(c);
959 if (likely(c))
960 return;
961 }
962
963 crypto_inc_byte(a, size);
964}
965EXPORT_SYMBOL_GPL(crypto_inc);
966
967void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
968{
969 int relalign = 0;
970
971 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
972 int size = sizeof(unsigned long);
973 int d = (((unsigned long)dst ^ (unsigned long)src1) |
974 ((unsigned long)dst ^ (unsigned long)src2)) &
975 (size - 1);
976
977 relalign = d ? 1 << __ffs(d) : size;
978
979 /*
980 * If we care about alignment, process as many bytes as
981 * needed to advance dst and src to values whose alignments
982 * equal their relative alignment. This will allow us to
983 * process the remainder of the input using optimal strides.
984 */
985 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
986 *dst++ = *src1++ ^ *src2++;
987 len--;
988 }
989 }
990
991 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
992 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
993 dst += 8;
994 src1 += 8;
995 src2 += 8;
996 len -= 8;
997 }
998
999 while (len >= 4 && !(relalign & 3)) {
1000 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1001 dst += 4;
1002 src1 += 4;
1003 src2 += 4;
1004 len -= 4;
1005 }
1006
1007 while (len >= 2 && !(relalign & 1)) {
1008 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1009 dst += 2;
1010 src1 += 2;
1011 src2 += 2;
1012 len -= 2;
1013 }
1014
1015 while (len--)
1016 *dst++ = *src1++ ^ *src2++;
1017}
1018EXPORT_SYMBOL_GPL(__crypto_xor);
1019
1020unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1021{
1022 return alg->cra_ctxsize +
1023 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1024}
1025EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1026
1027int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1028 u32 type, u32 mask)
1029{
1030 int ret = 0;
1031 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1032
1033 if (!IS_ERR(alg)) {
1034 crypto_mod_put(alg);
1035 ret = 1;
1036 }
1037
1038 return ret;
1039}
1040EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1041
1042#ifdef CONFIG_CRYPTO_STATS
1043void crypto_stats_init(struct crypto_alg *alg)
1044{
1045 memset(&alg->stats, 0, sizeof(alg->stats));
1046}
1047EXPORT_SYMBOL_GPL(crypto_stats_init);
1048
1049void crypto_stats_get(struct crypto_alg *alg)
1050{
1051 crypto_alg_get(alg);
1052}
1053EXPORT_SYMBOL_GPL(crypto_stats_get);
1054
1055void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1056 struct crypto_alg *alg)
1057{
1058 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1059 atomic64_inc(&alg->stats.cipher.err_cnt);
1060 } else {
1061 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1062 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1063 }
1064 crypto_alg_put(alg);
1065}
1066EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1067
1068void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1069 struct crypto_alg *alg)
1070{
1071 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1072 atomic64_inc(&alg->stats.cipher.err_cnt);
1073 } else {
1074 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1075 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1076 }
1077 crypto_alg_put(alg);
1078}
1079EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1080
1081void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1082 int ret)
1083{
1084 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1085 atomic64_inc(&alg->stats.aead.err_cnt);
1086 } else {
1087 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1088 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1089 }
1090 crypto_alg_put(alg);
1091}
1092EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1093
1094void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1095 int ret)
1096{
1097 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1098 atomic64_inc(&alg->stats.aead.err_cnt);
1099 } else {
1100 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1101 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1102 }
1103 crypto_alg_put(alg);
1104}
1105EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1106
1107void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1108 struct crypto_alg *alg)
1109{
1110 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1111 atomic64_inc(&alg->stats.akcipher.err_cnt);
1112 } else {
1113 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1114 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1115 }
1116 crypto_alg_put(alg);
1117}
1118EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1119
1120void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1121 struct crypto_alg *alg)
1122{
1123 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1124 atomic64_inc(&alg->stats.akcipher.err_cnt);
1125 } else {
1126 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1127 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1128 }
1129 crypto_alg_put(alg);
1130}
1131EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1132
1133void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1134{
1135 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1136 atomic64_inc(&alg->stats.akcipher.err_cnt);
1137 else
1138 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1139 crypto_alg_put(alg);
1140}
1141EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1142
1143void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1144{
1145 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1146 atomic64_inc(&alg->stats.akcipher.err_cnt);
1147 else
1148 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1149 crypto_alg_put(alg);
1150}
1151EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1152
1153void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1154{
1155 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1156 atomic64_inc(&alg->stats.compress.err_cnt);
1157 } else {
1158 atomic64_inc(&alg->stats.compress.compress_cnt);
1159 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1160 }
1161 crypto_alg_put(alg);
1162}
1163EXPORT_SYMBOL_GPL(crypto_stats_compress);
1164
1165void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1166{
1167 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1168 atomic64_inc(&alg->stats.compress.err_cnt);
1169 } else {
1170 atomic64_inc(&alg->stats.compress.decompress_cnt);
1171 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1172 }
1173 crypto_alg_put(alg);
1174}
1175EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1176
1177void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1178 struct crypto_alg *alg)
1179{
1180 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1181 atomic64_inc(&alg->stats.hash.err_cnt);
1182 else
1183 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1184 crypto_alg_put(alg);
1185}
1186EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1187
1188void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1189 struct crypto_alg *alg)
1190{
1191 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1192 atomic64_inc(&alg->stats.hash.err_cnt);
1193 } else {
1194 atomic64_inc(&alg->stats.hash.hash_cnt);
1195 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1196 }
1197 crypto_alg_put(alg);
1198}
1199EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1200
1201void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1202{
1203 if (ret)
1204 atomic64_inc(&alg->stats.kpp.err_cnt);
1205 else
1206 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1207 crypto_alg_put(alg);
1208}
1209EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1210
1211void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1212{
1213 if (ret)
1214 atomic64_inc(&alg->stats.kpp.err_cnt);
1215 else
1216 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1217 crypto_alg_put(alg);
1218}
1219EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1220
1221void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1222{
1223 if (ret)
1224 atomic64_inc(&alg->stats.kpp.err_cnt);
1225 else
1226 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1227 crypto_alg_put(alg);
1228}
1229EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1230
1231void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1232{
1233 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1234 atomic64_inc(&alg->stats.rng.err_cnt);
1235 else
1236 atomic64_inc(&alg->stats.rng.seed_cnt);
1237 crypto_alg_put(alg);
1238}
1239EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1240
1241void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1242 int ret)
1243{
1244 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1245 atomic64_inc(&alg->stats.rng.err_cnt);
1246 } else {
1247 atomic64_inc(&alg->stats.rng.generate_cnt);
1248 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1249 }
1250 crypto_alg_put(alg);
1251}
1252EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1253
1254void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1255 struct crypto_alg *alg)
1256{
1257 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1258 atomic64_inc(&alg->stats.cipher.err_cnt);
1259 } else {
1260 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1261 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1262 }
1263 crypto_alg_put(alg);
1264}
1265EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1266
1267void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1268 struct crypto_alg *alg)
1269{
1270 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1271 atomic64_inc(&alg->stats.cipher.err_cnt);
1272 } else {
1273 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1274 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1275 }
1276 crypto_alg_put(alg);
1277}
1278EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1279#endif
1280
1281static int __init crypto_algapi_init(void)
1282{
1283 crypto_init_proc();
1284 return 0;
1285}
1286
1287static void __exit crypto_algapi_exit(void)
1288{
1289 crypto_exit_proc();
1290}
1291
1292module_init(crypto_algapi_init);
1293module_exit(crypto_algapi_exit);
1294
1295MODULE_LICENSE("GPL");
1296MODULE_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/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");