projects/linux·blob v5.0 · refs

1327 lines · 29.3 KiB

1/*
2 * Cryptographic API for algorithms (i.e., low-level API).
3 *
4 * Copyright (c) 2006 Herbert Xu <[email protected]>
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 <crypto/algapi.h>
14#include <linux/err.h>
15#include <linux/errno.h>
16#include <linux/fips.h>
17#include <linux/init.h>
18#include <linux/kernel.h>
19#include <linux/list.h>
20#include <linux/module.h>
21#include <linux/rtnetlink.h>
22#include <linux/slab.h>
23#include <linux/string.h>
24
25#include "internal.h"
26
27static LIST_HEAD(crypto_template_list);
28
29static inline int crypto_set_driver_name(struct crypto_alg *alg)
30{
31 static const char suffix[] = "-generic";
32 char *driver_name = alg->cra_driver_name;
33 int len;
34
35 if (*driver_name)
36 return 0;
37
38 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
39 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
40 return -ENAMETOOLONG;
41
42 memcpy(driver_name + len, suffix, sizeof(suffix));
43 return 0;
44}
45
46static inline void crypto_check_module_sig(struct module *mod)
47{
48 if (fips_enabled && mod && !module_sig_ok(mod))
49 panic("Module %s signature verification failed in FIPS mode\n",
50 module_name(mod));
51}
52
53static int crypto_check_alg(struct crypto_alg *alg)
54{
55 crypto_check_module_sig(alg->cra_module);
56
57 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
58 return -EINVAL;
59
60 /* General maximums for all algs. */
61 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
62 return -EINVAL;
63
64 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
65 return -EINVAL;
66
67 /* Lower maximums for specific alg types. */
68 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
69 CRYPTO_ALG_TYPE_CIPHER) {
70 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
71 return -EINVAL;
72
73 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
74 return -EINVAL;
75 }
76
77 if (alg->cra_priority < 0)
78 return -EINVAL;
79
80 refcount_set(&alg->cra_refcnt, 1);
81
82 return crypto_set_driver_name(alg);
83}
84
85static void crypto_free_instance(struct crypto_instance *inst)
86{
87 if (!inst->alg.cra_type->free) {
88 inst->tmpl->free(inst);
89 return;
90 }
91
92 inst->alg.cra_type->free(inst);
93}
94
95static void crypto_destroy_instance(struct crypto_alg *alg)
96{
97 struct crypto_instance *inst = (void *)alg;
98 struct crypto_template *tmpl = inst->tmpl;
99
100 crypto_free_instance(inst);
101 crypto_tmpl_put(tmpl);
102}
103
104static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
105 struct list_head *stack,
106 struct list_head *top,
107 struct list_head *secondary_spawns)
108{
109 struct crypto_spawn *spawn, *n;
110
111 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
112 if (!spawn)
113 return NULL;
114
115 n = list_next_entry(spawn, list);
116
117 if (spawn->alg && &n->list != stack && !n->alg)
118 n->alg = (n->list.next == stack) ? alg :
119 &list_next_entry(n, list)->inst->alg;
120
121 list_move(&spawn->list, secondary_spawns);
122
123 return &n->list == stack ? top : &n->inst->alg.cra_users;
124}
125
126static void crypto_remove_instance(struct crypto_instance *inst,
127 struct list_head *list)
128{
129 struct crypto_template *tmpl = inst->tmpl;
130
131 if (crypto_is_dead(&inst->alg))
132 return;
133
134 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
135 if (hlist_unhashed(&inst->list))
136 return;
137
138 if (!tmpl || !crypto_tmpl_get(tmpl))
139 return;
140
141 list_move(&inst->alg.cra_list, list);
142 hlist_del(&inst->list);
143 inst->alg.cra_destroy = crypto_destroy_instance;
144
145 BUG_ON(!list_empty(&inst->alg.cra_users));
146}
147
148void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
149 struct crypto_alg *nalg)
150{
151 u32 new_type = (nalg ?: alg)->cra_flags;
152 struct crypto_spawn *spawn, *n;
153 LIST_HEAD(secondary_spawns);
154 struct list_head *spawns;
155 LIST_HEAD(stack);
156 LIST_HEAD(top);
157
158 spawns = &alg->cra_users;
159 list_for_each_entry_safe(spawn, n, spawns, list) {
160 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
161 continue;
162
163 list_move(&spawn->list, &top);
164 }
165
166 spawns = &top;
167 do {
168 while (!list_empty(spawns)) {
169 struct crypto_instance *inst;
170
171 spawn = list_first_entry(spawns, struct crypto_spawn,
172 list);
173 inst = spawn->inst;
174
175 BUG_ON(&inst->alg == alg);
176
177 list_move(&spawn->list, &stack);
178
179 if (&inst->alg == nalg)
180 break;
181
182 spawn->alg = NULL;
183 spawns = &inst->alg.cra_users;
184
185 /*
186 * We may encounter an unregistered instance here, since
187 * an instance's spawns are set up prior to the instance
188 * being registered. An unregistered instance will have
189 * NULL ->cra_users.next, since ->cra_users isn't
190 * properly initialized until registration. But an
191 * unregistered instance cannot have any users, so treat
192 * it the same as ->cra_users being empty.
193 */
194 if (spawns->next == NULL)
195 break;
196 }
197 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
198 &secondary_spawns)));
199
200 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
201 if (spawn->alg)
202 list_move(&spawn->list, &spawn->alg->cra_users);
203 else
204 crypto_remove_instance(spawn->inst, list);
205 }
206}
207EXPORT_SYMBOL_GPL(crypto_remove_spawns);
208
209static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
210{
211 struct crypto_alg *q;
212 struct crypto_larval *larval;
213 int ret = -EAGAIN;
214
215 if (crypto_is_dead(alg))
216 goto err;
217
218 INIT_LIST_HEAD(&alg->cra_users);
219
220 /* No cheating! */
221 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
222
223 ret = -EEXIST;
224
225 list_for_each_entry(q, &crypto_alg_list, cra_list) {
226 if (q == alg)
227 goto err;
228
229 if (crypto_is_moribund(q))
230 continue;
231
232 if (crypto_is_larval(q)) {
233 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
234 goto err;
235 continue;
236 }
237
238 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
239 !strcmp(q->cra_name, alg->cra_driver_name))
240 goto err;
241 }
242
243 larval = crypto_larval_alloc(alg->cra_name,
244 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
245 if (IS_ERR(larval))
246 goto out;
247
248 ret = -ENOENT;
249 larval->adult = crypto_mod_get(alg);
250 if (!larval->adult)
251 goto free_larval;
252
253 refcount_set(&larval->alg.cra_refcnt, 1);
254 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
255 CRYPTO_MAX_ALG_NAME);
256 larval->alg.cra_priority = alg->cra_priority;
257
258 list_add(&alg->cra_list, &crypto_alg_list);
259 list_add(&larval->alg.cra_list, &crypto_alg_list);
260
261 crypto_stats_init(alg);
262
263out:
264 return larval;
265
266free_larval:
267 kfree(larval);
268err:
269 larval = ERR_PTR(ret);
270 goto out;
271}
272
273void crypto_alg_tested(const char *name, int err)
274{
275 struct crypto_larval *test;
276 struct crypto_alg *alg;
277 struct crypto_alg *q;
278 LIST_HEAD(list);
279
280 down_write(&crypto_alg_sem);
281 list_for_each_entry(q, &crypto_alg_list, cra_list) {
282 if (crypto_is_moribund(q) || !crypto_is_larval(q))
283 continue;
284
285 test = (struct crypto_larval *)q;
286
287 if (!strcmp(q->cra_driver_name, name))
288 goto found;
289 }
290
291 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
292 goto unlock;
293
294found:
295 q->cra_flags |= CRYPTO_ALG_DEAD;
296 alg = test->adult;
297 if (err || list_empty(&alg->cra_list))
298 goto complete;
299
300 alg->cra_flags |= CRYPTO_ALG_TESTED;
301
302 list_for_each_entry(q, &crypto_alg_list, cra_list) {
303 if (q == alg)
304 continue;
305
306 if (crypto_is_moribund(q))
307 continue;
308
309 if (crypto_is_larval(q)) {
310 struct crypto_larval *larval = (void *)q;
311
312 /*
313 * Check to see if either our generic name or
314 * specific name can satisfy the name requested
315 * by the larval entry q.
316 */
317 if (strcmp(alg->cra_name, q->cra_name) &&
318 strcmp(alg->cra_driver_name, q->cra_name))
319 continue;
320
321 if (larval->adult)
322 continue;
323 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
324 continue;
325 if (!crypto_mod_get(alg))
326 continue;
327
328 larval->adult = alg;
329 continue;
330 }
331
332 if (strcmp(alg->cra_name, q->cra_name))
333 continue;
334
335 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
336 q->cra_priority > alg->cra_priority)
337 continue;
338
339 crypto_remove_spawns(q, &list, alg);
340 }
341
342complete:
343 complete_all(&test->completion);
344
345unlock:
346 up_write(&crypto_alg_sem);
347
348 crypto_remove_final(&list);
349}
350EXPORT_SYMBOL_GPL(crypto_alg_tested);
351
352void crypto_remove_final(struct list_head *list)
353{
354 struct crypto_alg *alg;
355 struct crypto_alg *n;
356
357 list_for_each_entry_safe(alg, n, list, cra_list) {
358 list_del_init(&alg->cra_list);
359 crypto_alg_put(alg);
360 }
361}
362EXPORT_SYMBOL_GPL(crypto_remove_final);
363
364static void crypto_wait_for_test(struct crypto_larval *larval)
365{
366 int err;
367
368 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
369 if (err != NOTIFY_STOP) {
370 if (WARN_ON(err != NOTIFY_DONE))
371 goto out;
372 crypto_alg_tested(larval->alg.cra_driver_name, 0);
373 }
374
375 err = wait_for_completion_killable(&larval->completion);
376 WARN_ON(err);
377 if (!err)
378 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
379
380out:
381 crypto_larval_kill(&larval->alg);
382}
383
384int crypto_register_alg(struct crypto_alg *alg)
385{
386 struct crypto_larval *larval;
387 int err;
388
389 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
390 err = crypto_check_alg(alg);
391 if (err)
392 return err;
393
394 down_write(&crypto_alg_sem);
395 larval = __crypto_register_alg(alg);
396 up_write(&crypto_alg_sem);
397
398 if (IS_ERR(larval))
399 return PTR_ERR(larval);
400
401 crypto_wait_for_test(larval);
402 return 0;
403}
404EXPORT_SYMBOL_GPL(crypto_register_alg);
405
406static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
407{
408 if (unlikely(list_empty(&alg->cra_list)))
409 return -ENOENT;
410
411 alg->cra_flags |= CRYPTO_ALG_DEAD;
412
413 list_del_init(&alg->cra_list);
414 crypto_remove_spawns(alg, list, NULL);
415
416 return 0;
417}
418
419int crypto_unregister_alg(struct crypto_alg *alg)
420{
421 int ret;
422 LIST_HEAD(list);
423
424 down_write(&crypto_alg_sem);
425 ret = crypto_remove_alg(alg, &list);
426 up_write(&crypto_alg_sem);
427
428 if (ret)
429 return ret;
430
431 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
432 if (alg->cra_destroy)
433 alg->cra_destroy(alg);
434
435 crypto_remove_final(&list);
436 return 0;
437}
438EXPORT_SYMBOL_GPL(crypto_unregister_alg);
439
440int crypto_register_algs(struct crypto_alg *algs, int count)
441{
442 int i, ret;
443
444 for (i = 0; i < count; i++) {
445 ret = crypto_register_alg(&algs[i]);
446 if (ret)
447 goto err;
448 }
449
450 return 0;
451
452err:
453 for (--i; i >= 0; --i)
454 crypto_unregister_alg(&algs[i]);
455
456 return ret;
457}
458EXPORT_SYMBOL_GPL(crypto_register_algs);
459
460int crypto_unregister_algs(struct crypto_alg *algs, int count)
461{
462 int i, ret;
463
464 for (i = 0; i < count; i++) {
465 ret = crypto_unregister_alg(&algs[i]);
466 if (ret)
467 pr_err("Failed to unregister %s %s: %d\n",
468 algs[i].cra_driver_name, algs[i].cra_name, ret);
469 }
470
471 return 0;
472}
473EXPORT_SYMBOL_GPL(crypto_unregister_algs);
474
475int crypto_register_template(struct crypto_template *tmpl)
476{
477 struct crypto_template *q;
478 int err = -EEXIST;
479
480 down_write(&crypto_alg_sem);
481
482 crypto_check_module_sig(tmpl->module);
483
484 list_for_each_entry(q, &crypto_template_list, list) {
485 if (q == tmpl)
486 goto out;
487 }
488
489 list_add(&tmpl->list, &crypto_template_list);
490 err = 0;
491out:
492 up_write(&crypto_alg_sem);
493 return err;
494}
495EXPORT_SYMBOL_GPL(crypto_register_template);
496
497void crypto_unregister_template(struct crypto_template *tmpl)
498{
499 struct crypto_instance *inst;
500 struct hlist_node *n;
501 struct hlist_head *list;
502 LIST_HEAD(users);
503
504 down_write(&crypto_alg_sem);
505
506 BUG_ON(list_empty(&tmpl->list));
507 list_del_init(&tmpl->list);
508
509 list = &tmpl->instances;
510 hlist_for_each_entry(inst, list, list) {
511 int err = crypto_remove_alg(&inst->alg, &users);
512
513 BUG_ON(err);
514 }
515
516 up_write(&crypto_alg_sem);
517
518 hlist_for_each_entry_safe(inst, n, list, list) {
519 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
520 crypto_free_instance(inst);
521 }
522 crypto_remove_final(&users);
523}
524EXPORT_SYMBOL_GPL(crypto_unregister_template);
525
526static struct crypto_template *__crypto_lookup_template(const char *name)
527{
528 struct crypto_template *q, *tmpl = NULL;
529
530 down_read(&crypto_alg_sem);
531 list_for_each_entry(q, &crypto_template_list, list) {
532 if (strcmp(q->name, name))
533 continue;
534 if (unlikely(!crypto_tmpl_get(q)))
535 continue;
536
537 tmpl = q;
538 break;
539 }
540 up_read(&crypto_alg_sem);
541
542 return tmpl;
543}
544
545struct crypto_template *crypto_lookup_template(const char *name)
546{
547 return try_then_request_module(__crypto_lookup_template(name),
548 "crypto-%s", name);
549}
550EXPORT_SYMBOL_GPL(crypto_lookup_template);
551
552int crypto_register_instance(struct crypto_template *tmpl,
553 struct crypto_instance *inst)
554{
555 struct crypto_larval *larval;
556 int err;
557
558 err = crypto_check_alg(&inst->alg);
559 if (err)
560 return err;
561
562 inst->alg.cra_module = tmpl->module;
563 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
564
565 down_write(&crypto_alg_sem);
566
567 larval = __crypto_register_alg(&inst->alg);
568 if (IS_ERR(larval))
569 goto unlock;
570
571 hlist_add_head(&inst->list, &tmpl->instances);
572 inst->tmpl = tmpl;
573
574unlock:
575 up_write(&crypto_alg_sem);
576
577 err = PTR_ERR(larval);
578 if (IS_ERR(larval))
579 goto err;
580
581 crypto_wait_for_test(larval);
582 err = 0;
583
584err:
585 return err;
586}
587EXPORT_SYMBOL_GPL(crypto_register_instance);
588
589int crypto_unregister_instance(struct crypto_instance *inst)
590{
591 LIST_HEAD(list);
592
593 down_write(&crypto_alg_sem);
594
595 crypto_remove_spawns(&inst->alg, &list, NULL);
596 crypto_remove_instance(inst, &list);
597
598 up_write(&crypto_alg_sem);
599
600 crypto_remove_final(&list);
601
602 return 0;
603}
604EXPORT_SYMBOL_GPL(crypto_unregister_instance);
605
606int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
607 struct crypto_instance *inst, u32 mask)
608{
609 int err = -EAGAIN;
610
611 spawn->inst = inst;
612 spawn->mask = mask;
613
614 down_write(&crypto_alg_sem);
615 if (!crypto_is_moribund(alg)) {
616 list_add(&spawn->list, &alg->cra_users);
617 spawn->alg = alg;
618 err = 0;
619 }
620 up_write(&crypto_alg_sem);
621
622 return err;
623}
624EXPORT_SYMBOL_GPL(crypto_init_spawn);
625
626int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
627 struct crypto_instance *inst,
628 const struct crypto_type *frontend)
629{
630 int err = -EINVAL;
631
632 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
633 goto out;
634
635 spawn->frontend = frontend;
636 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
637
638out:
639 return err;
640}
641EXPORT_SYMBOL_GPL(crypto_init_spawn2);
642
643int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
644 u32 type, u32 mask)
645{
646 struct crypto_alg *alg;
647 int err;
648
649 alg = crypto_find_alg(name, spawn->frontend, type, mask);
650 if (IS_ERR(alg))
651 return PTR_ERR(alg);
652
653 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
654 crypto_mod_put(alg);
655 return err;
656}
657EXPORT_SYMBOL_GPL(crypto_grab_spawn);
658
659void crypto_drop_spawn(struct crypto_spawn *spawn)
660{
661 if (!spawn->alg)
662 return;
663
664 down_write(&crypto_alg_sem);
665 list_del(&spawn->list);
666 up_write(&crypto_alg_sem);
667}
668EXPORT_SYMBOL_GPL(crypto_drop_spawn);
669
670static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
671{
672 struct crypto_alg *alg;
673 struct crypto_alg *alg2;
674
675 down_read(&crypto_alg_sem);
676 alg = spawn->alg;
677 alg2 = alg;
678 if (alg2)
679 alg2 = crypto_mod_get(alg2);
680 up_read(&crypto_alg_sem);
681
682 if (!alg2) {
683 if (alg)
684 crypto_shoot_alg(alg);
685 return ERR_PTR(-EAGAIN);
686 }
687
688 return alg;
689}
690
691struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
692 u32 mask)
693{
694 struct crypto_alg *alg;
695 struct crypto_tfm *tfm;
696
697 alg = crypto_spawn_alg(spawn);
698 if (IS_ERR(alg))
699 return ERR_CAST(alg);
700
701 tfm = ERR_PTR(-EINVAL);
702 if (unlikely((alg->cra_flags ^ type) & mask))
703 goto out_put_alg;
704
705 tfm = __crypto_alloc_tfm(alg, type, mask);
706 if (IS_ERR(tfm))
707 goto out_put_alg;
708
709 return tfm;
710
711out_put_alg:
712 crypto_mod_put(alg);
713 return tfm;
714}
715EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
716
717void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
718{
719 struct crypto_alg *alg;
720 struct crypto_tfm *tfm;
721
722 alg = crypto_spawn_alg(spawn);
723 if (IS_ERR(alg))
724 return ERR_CAST(alg);
725
726 tfm = crypto_create_tfm(alg, spawn->frontend);
727 if (IS_ERR(tfm))
728 goto out_put_alg;
729
730 return tfm;
731
732out_put_alg:
733 crypto_mod_put(alg);
734 return tfm;
735}
736EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
737
738int crypto_register_notifier(struct notifier_block *nb)
739{
740 return blocking_notifier_chain_register(&crypto_chain, nb);
741}
742EXPORT_SYMBOL_GPL(crypto_register_notifier);
743
744int crypto_unregister_notifier(struct notifier_block *nb)
745{
746 return blocking_notifier_chain_unregister(&crypto_chain, nb);
747}
748EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
749
750struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
751{
752 struct rtattr *rta = tb[0];
753 struct crypto_attr_type *algt;
754
755 if (!rta)
756 return ERR_PTR(-ENOENT);
757 if (RTA_PAYLOAD(rta) < sizeof(*algt))
758 return ERR_PTR(-EINVAL);
759 if (rta->rta_type != CRYPTOA_TYPE)
760 return ERR_PTR(-EINVAL);
761
762 algt = RTA_DATA(rta);
763
764 return algt;
765}
766EXPORT_SYMBOL_GPL(crypto_get_attr_type);
767
768int crypto_check_attr_type(struct rtattr **tb, u32 type)
769{
770 struct crypto_attr_type *algt;
771
772 algt = crypto_get_attr_type(tb);
773 if (IS_ERR(algt))
774 return PTR_ERR(algt);
775
776 if ((algt->type ^ type) & algt->mask)
777 return -EINVAL;
778
779 return 0;
780}
781EXPORT_SYMBOL_GPL(crypto_check_attr_type);
782
783const char *crypto_attr_alg_name(struct rtattr *rta)
784{
785 struct crypto_attr_alg *alga;
786
787 if (!rta)
788 return ERR_PTR(-ENOENT);
789 if (RTA_PAYLOAD(rta) < sizeof(*alga))
790 return ERR_PTR(-EINVAL);
791 if (rta->rta_type != CRYPTOA_ALG)
792 return ERR_PTR(-EINVAL);
793
794 alga = RTA_DATA(rta);
795 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
796
797 return alga->name;
798}
799EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
800
801struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
802 const struct crypto_type *frontend,
803 u32 type, u32 mask)
804{
805 const char *name;
806
807 name = crypto_attr_alg_name(rta);
808 if (IS_ERR(name))
809 return ERR_CAST(name);
810
811 return crypto_find_alg(name, frontend, type, mask);
812}
813EXPORT_SYMBOL_GPL(crypto_attr_alg2);
814
815int crypto_attr_u32(struct rtattr *rta, u32 *num)
816{
817 struct crypto_attr_u32 *nu32;
818
819 if (!rta)
820 return -ENOENT;
821 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
822 return -EINVAL;
823 if (rta->rta_type != CRYPTOA_U32)
824 return -EINVAL;
825
826 nu32 = RTA_DATA(rta);
827 *num = nu32->num;
828
829 return 0;
830}
831EXPORT_SYMBOL_GPL(crypto_attr_u32);
832
833int crypto_inst_setname(struct crypto_instance *inst, const char *name,
834 struct crypto_alg *alg)
835{
836 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
837 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
838 return -ENAMETOOLONG;
839
840 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
841 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
842 return -ENAMETOOLONG;
843
844 return 0;
845}
846EXPORT_SYMBOL_GPL(crypto_inst_setname);
847
848void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
849 unsigned int head)
850{
851 struct crypto_instance *inst;
852 char *p;
853 int err;
854
855 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
856 GFP_KERNEL);
857 if (!p)
858 return ERR_PTR(-ENOMEM);
859
860 inst = (void *)(p + head);
861
862 err = crypto_inst_setname(inst, name, alg);
863 if (err)
864 goto err_free_inst;
865
866 return p;
867
868err_free_inst:
869 kfree(p);
870 return ERR_PTR(err);
871}
872EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
873
874struct crypto_instance *crypto_alloc_instance(const char *name,
875 struct crypto_alg *alg)
876{
877 struct crypto_instance *inst;
878 struct crypto_spawn *spawn;
879 int err;
880
881 inst = crypto_alloc_instance2(name, alg, 0);
882 if (IS_ERR(inst))
883 goto out;
884
885 spawn = crypto_instance_ctx(inst);
886 err = crypto_init_spawn(spawn, alg, inst,
887 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
888
889 if (err)
890 goto err_free_inst;
891
892 return inst;
893
894err_free_inst:
895 kfree(inst);
896 inst = ERR_PTR(err);
897
898out:
899 return inst;
900}
901EXPORT_SYMBOL_GPL(crypto_alloc_instance);
902
903void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
904{
905 INIT_LIST_HEAD(&queue->list);
906 queue->backlog = &queue->list;
907 queue->qlen = 0;
908 queue->max_qlen = max_qlen;
909}
910EXPORT_SYMBOL_GPL(crypto_init_queue);
911
912int crypto_enqueue_request(struct crypto_queue *queue,
913 struct crypto_async_request *request)
914{
915 int err = -EINPROGRESS;
916
917 if (unlikely(queue->qlen >= queue->max_qlen)) {
918 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
919 err = -ENOSPC;
920 goto out;
921 }
922 err = -EBUSY;
923 if (queue->backlog == &queue->list)
924 queue->backlog = &request->list;
925 }
926
927 queue->qlen++;
928 list_add_tail(&request->list, &queue->list);
929
930out:
931 return err;
932}
933EXPORT_SYMBOL_GPL(crypto_enqueue_request);
934
935struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
936{
937 struct list_head *request;
938
939 if (unlikely(!queue->qlen))
940 return NULL;
941
942 queue->qlen--;
943
944 if (queue->backlog != &queue->list)
945 queue->backlog = queue->backlog->next;
946
947 request = queue->list.next;
948 list_del(request);
949
950 return list_entry(request, struct crypto_async_request, list);
951}
952EXPORT_SYMBOL_GPL(crypto_dequeue_request);
953
954int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
955{
956 struct crypto_async_request *req;
957
958 list_for_each_entry(req, &queue->list, list) {
959 if (req->tfm == tfm)
960 return 1;
961 }
962
963 return 0;
964}
965EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
966
967static inline void crypto_inc_byte(u8 *a, unsigned int size)
968{
969 u8 *b = (a + size);
970 u8 c;
971
972 for (; size; size--) {
973 c = *--b + 1;
974 *b = c;
975 if (c)
976 break;
977 }
978}
979
980void crypto_inc(u8 *a, unsigned int size)
981{
982 __be32 *b = (__be32 *)(a + size);
983 u32 c;
984
985 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
986 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
987 for (; size >= 4; size -= 4) {
988 c = be32_to_cpu(*--b) + 1;
989 *b = cpu_to_be32(c);
990 if (likely(c))
991 return;
992 }
993
994 crypto_inc_byte(a, size);
995}
996EXPORT_SYMBOL_GPL(crypto_inc);
997
998void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
999{
1000 int relalign = 0;
1001
1002 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
1003 int size = sizeof(unsigned long);
1004 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1005 ((unsigned long)dst ^ (unsigned long)src2)) &
1006 (size - 1);
1007
1008 relalign = d ? 1 << __ffs(d) : size;
1009
1010 /*
1011 * If we care about alignment, process as many bytes as
1012 * needed to advance dst and src to values whose alignments
1013 * equal their relative alignment. This will allow us to
1014 * process the remainder of the input using optimal strides.
1015 */
1016 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1017 *dst++ = *src1++ ^ *src2++;
1018 len--;
1019 }
1020 }
1021
1022 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1023 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
1024 dst += 8;
1025 src1 += 8;
1026 src2 += 8;
1027 len -= 8;
1028 }
1029
1030 while (len >= 4 && !(relalign & 3)) {
1031 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1032 dst += 4;
1033 src1 += 4;
1034 src2 += 4;
1035 len -= 4;
1036 }
1037
1038 while (len >= 2 && !(relalign & 1)) {
1039 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1040 dst += 2;
1041 src1 += 2;
1042 src2 += 2;
1043 len -= 2;
1044 }
1045
1046 while (len--)
1047 *dst++ = *src1++ ^ *src2++;
1048}
1049EXPORT_SYMBOL_GPL(__crypto_xor);
1050
1051unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1052{
1053 return alg->cra_ctxsize +
1054 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1055}
1056EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1057
1058int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1059 u32 type, u32 mask)
1060{
1061 int ret = 0;
1062 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1063
1064 if (!IS_ERR(alg)) {
1065 crypto_mod_put(alg);
1066 ret = 1;
1067 }
1068
1069 return ret;
1070}
1071EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1072
1073#ifdef CONFIG_CRYPTO_STATS
1074void crypto_stats_init(struct crypto_alg *alg)
1075{
1076 memset(&alg->stats, 0, sizeof(alg->stats));
1077}
1078EXPORT_SYMBOL_GPL(crypto_stats_init);
1079
1080void crypto_stats_get(struct crypto_alg *alg)
1081{
1082 crypto_alg_get(alg);
1083}
1084EXPORT_SYMBOL_GPL(crypto_stats_get);
1085
1086void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1087 struct crypto_alg *alg)
1088{
1089 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1090 atomic64_inc(&alg->stats.cipher.err_cnt);
1091 } else {
1092 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1093 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1094 }
1095 crypto_alg_put(alg);
1096}
1097EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1098
1099void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1100 struct crypto_alg *alg)
1101{
1102 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1103 atomic64_inc(&alg->stats.cipher.err_cnt);
1104 } else {
1105 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1106 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1107 }
1108 crypto_alg_put(alg);
1109}
1110EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1111
1112void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1113 int ret)
1114{
1115 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1116 atomic64_inc(&alg->stats.aead.err_cnt);
1117 } else {
1118 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1119 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1120 }
1121 crypto_alg_put(alg);
1122}
1123EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1124
1125void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1126 int ret)
1127{
1128 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1129 atomic64_inc(&alg->stats.aead.err_cnt);
1130 } else {
1131 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1132 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1133 }
1134 crypto_alg_put(alg);
1135}
1136EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1137
1138void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1139 struct crypto_alg *alg)
1140{
1141 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1142 atomic64_inc(&alg->stats.akcipher.err_cnt);
1143 } else {
1144 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1145 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1146 }
1147 crypto_alg_put(alg);
1148}
1149EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1150
1151void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1152 struct crypto_alg *alg)
1153{
1154 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1155 atomic64_inc(&alg->stats.akcipher.err_cnt);
1156 } else {
1157 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1158 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1159 }
1160 crypto_alg_put(alg);
1161}
1162EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1163
1164void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1165{
1166 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1167 atomic64_inc(&alg->stats.akcipher.err_cnt);
1168 else
1169 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1170 crypto_alg_put(alg);
1171}
1172EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1173
1174void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1175{
1176 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1177 atomic64_inc(&alg->stats.akcipher.err_cnt);
1178 else
1179 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1180 crypto_alg_put(alg);
1181}
1182EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1183
1184void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1185{
1186 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1187 atomic64_inc(&alg->stats.compress.err_cnt);
1188 } else {
1189 atomic64_inc(&alg->stats.compress.compress_cnt);
1190 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1191 }
1192 crypto_alg_put(alg);
1193}
1194EXPORT_SYMBOL_GPL(crypto_stats_compress);
1195
1196void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1197{
1198 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1199 atomic64_inc(&alg->stats.compress.err_cnt);
1200 } else {
1201 atomic64_inc(&alg->stats.compress.decompress_cnt);
1202 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1203 }
1204 crypto_alg_put(alg);
1205}
1206EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1207
1208void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1209 struct crypto_alg *alg)
1210{
1211 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1212 atomic64_inc(&alg->stats.hash.err_cnt);
1213 else
1214 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1215 crypto_alg_put(alg);
1216}
1217EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1218
1219void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1220 struct crypto_alg *alg)
1221{
1222 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1223 atomic64_inc(&alg->stats.hash.err_cnt);
1224 } else {
1225 atomic64_inc(&alg->stats.hash.hash_cnt);
1226 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1227 }
1228 crypto_alg_put(alg);
1229}
1230EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1231
1232void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1233{
1234 if (ret)
1235 atomic64_inc(&alg->stats.kpp.err_cnt);
1236 else
1237 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1238 crypto_alg_put(alg);
1239}
1240EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1241
1242void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1243{
1244 if (ret)
1245 atomic64_inc(&alg->stats.kpp.err_cnt);
1246 else
1247 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1248 crypto_alg_put(alg);
1249}
1250EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1251
1252void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1253{
1254 if (ret)
1255 atomic64_inc(&alg->stats.kpp.err_cnt);
1256 else
1257 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1258 crypto_alg_put(alg);
1259}
1260EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1261
1262void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1263{
1264 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1265 atomic64_inc(&alg->stats.rng.err_cnt);
1266 else
1267 atomic64_inc(&alg->stats.rng.seed_cnt);
1268 crypto_alg_put(alg);
1269}
1270EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1271
1272void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1273 int ret)
1274{
1275 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1276 atomic64_inc(&alg->stats.rng.err_cnt);
1277 } else {
1278 atomic64_inc(&alg->stats.rng.generate_cnt);
1279 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1280 }
1281 crypto_alg_put(alg);
1282}
1283EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1284
1285void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1286 struct crypto_alg *alg)
1287{
1288 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1289 atomic64_inc(&alg->stats.cipher.err_cnt);
1290 } else {
1291 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1292 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1293 }
1294 crypto_alg_put(alg);
1295}
1296EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1297
1298void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1299 struct crypto_alg *alg)
1300{
1301 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1302 atomic64_inc(&alg->stats.cipher.err_cnt);
1303 } else {
1304 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1305 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1306 }
1307 crypto_alg_put(alg);
1308}
1309EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1310#endif
1311
1312static int __init crypto_algapi_init(void)
1313{
1314 crypto_init_proc();
1315 return 0;
1316}
1317
1318static void __exit crypto_algapi_exit(void)
1319{
1320 crypto_exit_proc();
1321}
1322
1323module_init(crypto_algapi_init);
1324module_exit(crypto_algapi_exit);
1325
1326MODULE_LICENSE("GPL");
1327MODULE_DESCRIPTION("Cryptographic algorithms API");