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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 err = crypto_check_alg(alg);
360 if (err)
361 return err;
362
363 down_write(&crypto_alg_sem);
364 larval = __crypto_register_alg(alg);
365 up_write(&crypto_alg_sem);
366
367 if (IS_ERR(larval))
368 return PTR_ERR(larval);
369
370 crypto_wait_for_test(larval);
371 return 0;
372}
373EXPORT_SYMBOL_GPL(crypto_register_alg);
374
375static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
376{
377 if (unlikely(list_empty(&alg->cra_list)))
378 return -ENOENT;
379
380 alg->cra_flags |= CRYPTO_ALG_DEAD;
381
382 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
383 list_del_init(&alg->cra_list);
384 crypto_remove_spawns(alg, list, NULL);
385
386 return 0;
387}
388
389int crypto_unregister_alg(struct crypto_alg *alg)
390{
391 int ret;
392 LIST_HEAD(list);
393
394 down_write(&crypto_alg_sem);
395 ret = crypto_remove_alg(alg, &list);
396 up_write(&crypto_alg_sem);
397
398 if (ret)
399 return ret;
400
401 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
402 if (alg->cra_destroy)
403 alg->cra_destroy(alg);
404
405 crypto_remove_final(&list);
406 return 0;
407}
408EXPORT_SYMBOL_GPL(crypto_unregister_alg);
409
410int crypto_register_algs(struct crypto_alg *algs, int count)
411{
412 int i, ret;
413
414 for (i = 0; i < count; i++) {
415 ret = crypto_register_alg(&algs[i]);
416 if (ret)
417 goto err;
418 }
419
420 return 0;
421
422err:
423 for (--i; i >= 0; --i)
424 crypto_unregister_alg(&algs[i]);
425
426 return ret;
427}
428EXPORT_SYMBOL_GPL(crypto_register_algs);
429
430int crypto_unregister_algs(struct crypto_alg *algs, int count)
431{
432 int i, ret;
433
434 for (i = 0; i < count; i++) {
435 ret = crypto_unregister_alg(&algs[i]);
436 if (ret)
437 pr_err("Failed to unregister %s %s: %d\n",
438 algs[i].cra_driver_name, algs[i].cra_name, ret);
439 }
440
441 return 0;
442}
443EXPORT_SYMBOL_GPL(crypto_unregister_algs);
444
445int crypto_register_template(struct crypto_template *tmpl)
446{
447 struct crypto_template *q;
448 int err = -EEXIST;
449
450 down_write(&crypto_alg_sem);
451
452 crypto_check_module_sig(tmpl->module);
453
454 list_for_each_entry(q, &crypto_template_list, list) {
455 if (q == tmpl)
456 goto out;
457 }
458
459 list_add(&tmpl->list, &crypto_template_list);
460 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
461 err = 0;
462out:
463 up_write(&crypto_alg_sem);
464 return err;
465}
466EXPORT_SYMBOL_GPL(crypto_register_template);
467
468void crypto_unregister_template(struct crypto_template *tmpl)
469{
470 struct crypto_instance *inst;
471 struct hlist_node *n;
472 struct hlist_head *list;
473 LIST_HEAD(users);
474
475 down_write(&crypto_alg_sem);
476
477 BUG_ON(list_empty(&tmpl->list));
478 list_del_init(&tmpl->list);
479
480 list = &tmpl->instances;
481 hlist_for_each_entry(inst, list, list) {
482 int err = crypto_remove_alg(&inst->alg, &users);
483
484 BUG_ON(err);
485 }
486
487 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
488
489 up_write(&crypto_alg_sem);
490
491 hlist_for_each_entry_safe(inst, n, list, list) {
492 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
493 crypto_free_instance(inst);
494 }
495 crypto_remove_final(&users);
496}
497EXPORT_SYMBOL_GPL(crypto_unregister_template);
498
499static struct crypto_template *__crypto_lookup_template(const char *name)
500{
501 struct crypto_template *q, *tmpl = NULL;
502
503 down_read(&crypto_alg_sem);
504 list_for_each_entry(q, &crypto_template_list, list) {
505 if (strcmp(q->name, name))
506 continue;
507 if (unlikely(!crypto_tmpl_get(q)))
508 continue;
509
510 tmpl = q;
511 break;
512 }
513 up_read(&crypto_alg_sem);
514
515 return tmpl;
516}
517
518struct crypto_template *crypto_lookup_template(const char *name)
519{
520 return try_then_request_module(__crypto_lookup_template(name),
521 "crypto-%s", name);
522}
523EXPORT_SYMBOL_GPL(crypto_lookup_template);
524
525int crypto_register_instance(struct crypto_template *tmpl,
526 struct crypto_instance *inst)
527{
528 struct crypto_larval *larval;
529 int err;
530
531 err = crypto_check_alg(&inst->alg);
532 if (err)
533 return err;
534
535 inst->alg.cra_module = tmpl->module;
536 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
537
538 if (unlikely(!crypto_mod_get(&inst->alg)))
539 return -EAGAIN;
540
541 down_write(&crypto_alg_sem);
542
543 larval = __crypto_register_alg(&inst->alg);
544 if (IS_ERR(larval))
545 goto unlock;
546
547 hlist_add_head(&inst->list, &tmpl->instances);
548 inst->tmpl = tmpl;
549
550unlock:
551 up_write(&crypto_alg_sem);
552
553 err = PTR_ERR(larval);
554 if (IS_ERR(larval))
555 goto err;
556
557 crypto_wait_for_test(larval);
558
559 /* Remove instance if test failed */
560 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
561 crypto_unregister_instance(inst);
562 err = 0;
563
564err:
565 crypto_mod_put(&inst->alg);
566 return err;
567}
568EXPORT_SYMBOL_GPL(crypto_register_instance);
569
570int crypto_unregister_instance(struct crypto_instance *inst)
571{
572 LIST_HEAD(list);
573
574 down_write(&crypto_alg_sem);
575
576 crypto_remove_spawns(&inst->alg, &list, NULL);
577 crypto_remove_instance(inst, &list);
578
579 up_write(&crypto_alg_sem);
580
581 crypto_remove_final(&list);
582
583 return 0;
584}
585EXPORT_SYMBOL_GPL(crypto_unregister_instance);
586
587int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
588 struct crypto_instance *inst, u32 mask)
589{
590 int err = -EAGAIN;
591
592 spawn->inst = inst;
593 spawn->mask = mask;
594
595 down_write(&crypto_alg_sem);
596 if (!crypto_is_moribund(alg)) {
597 list_add(&spawn->list, &alg->cra_users);
598 spawn->alg = alg;
599 err = 0;
600 }
601 up_write(&crypto_alg_sem);
602
603 return err;
604}
605EXPORT_SYMBOL_GPL(crypto_init_spawn);
606
607int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
608 struct crypto_instance *inst,
609 const struct crypto_type *frontend)
610{
611 int err = -EINVAL;
612
613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
614 goto out;
615
616 spawn->frontend = frontend;
617 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
618
619out:
620 return err;
621}
622EXPORT_SYMBOL_GPL(crypto_init_spawn2);
623
624int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
625 u32 type, u32 mask)
626{
627 struct crypto_alg *alg;
628 int err;
629
630 alg = crypto_find_alg(name, spawn->frontend, type, mask);
631 if (IS_ERR(alg))
632 return PTR_ERR(alg);
633
634 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
635 crypto_mod_put(alg);
636 return err;
637}
638EXPORT_SYMBOL_GPL(crypto_grab_spawn);
639
640void crypto_drop_spawn(struct crypto_spawn *spawn)
641{
642 if (!spawn->alg)
643 return;
644
645 down_write(&crypto_alg_sem);
646 list_del(&spawn->list);
647 up_write(&crypto_alg_sem);
648}
649EXPORT_SYMBOL_GPL(crypto_drop_spawn);
650
651static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
652{
653 struct crypto_alg *alg;
654 struct crypto_alg *alg2;
655
656 down_read(&crypto_alg_sem);
657 alg = spawn->alg;
658 alg2 = alg;
659 if (alg2)
660 alg2 = crypto_mod_get(alg2);
661 up_read(&crypto_alg_sem);
662
663 if (!alg2) {
664 if (alg)
665 crypto_shoot_alg(alg);
666 return ERR_PTR(-EAGAIN);
667 }
668
669 return alg;
670}
671
672struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
673 u32 mask)
674{
675 struct crypto_alg *alg;
676 struct crypto_tfm *tfm;
677
678 alg = crypto_spawn_alg(spawn);
679 if (IS_ERR(alg))
680 return ERR_CAST(alg);
681
682 tfm = ERR_PTR(-EINVAL);
683 if (unlikely((alg->cra_flags ^ type) & mask))
684 goto out_put_alg;
685
686 tfm = __crypto_alloc_tfm(alg, type, mask);
687 if (IS_ERR(tfm))
688 goto out_put_alg;
689
690 return tfm;
691
692out_put_alg:
693 crypto_mod_put(alg);
694 return tfm;
695}
696EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
697
698void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
699{
700 struct crypto_alg *alg;
701 struct crypto_tfm *tfm;
702
703 alg = crypto_spawn_alg(spawn);
704 if (IS_ERR(alg))
705 return ERR_CAST(alg);
706
707 tfm = crypto_create_tfm(alg, spawn->frontend);
708 if (IS_ERR(tfm))
709 goto out_put_alg;
710
711 return tfm;
712
713out_put_alg:
714 crypto_mod_put(alg);
715 return tfm;
716}
717EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
718
719int crypto_register_notifier(struct notifier_block *nb)
720{
721 return blocking_notifier_chain_register(&crypto_chain, nb);
722}
723EXPORT_SYMBOL_GPL(crypto_register_notifier);
724
725int crypto_unregister_notifier(struct notifier_block *nb)
726{
727 return blocking_notifier_chain_unregister(&crypto_chain, nb);
728}
729EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
730
731struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
732{
733 struct rtattr *rta = tb[0];
734 struct crypto_attr_type *algt;
735
736 if (!rta)
737 return ERR_PTR(-ENOENT);
738 if (RTA_PAYLOAD(rta) < sizeof(*algt))
739 return ERR_PTR(-EINVAL);
740 if (rta->rta_type != CRYPTOA_TYPE)
741 return ERR_PTR(-EINVAL);
742
743 algt = RTA_DATA(rta);
744
745 return algt;
746}
747EXPORT_SYMBOL_GPL(crypto_get_attr_type);
748
749int crypto_check_attr_type(struct rtattr **tb, u32 type)
750{
751 struct crypto_attr_type *algt;
752
753 algt = crypto_get_attr_type(tb);
754 if (IS_ERR(algt))
755 return PTR_ERR(algt);
756
757 if ((algt->type ^ type) & algt->mask)
758 return -EINVAL;
759
760 return 0;
761}
762EXPORT_SYMBOL_GPL(crypto_check_attr_type);
763
764const char *crypto_attr_alg_name(struct rtattr *rta)
765{
766 struct crypto_attr_alg *alga;
767
768 if (!rta)
769 return ERR_PTR(-ENOENT);
770 if (RTA_PAYLOAD(rta) < sizeof(*alga))
771 return ERR_PTR(-EINVAL);
772 if (rta->rta_type != CRYPTOA_ALG)
773 return ERR_PTR(-EINVAL);
774
775 alga = RTA_DATA(rta);
776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
777
778 return alga->name;
779}
780EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
781
782struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
783 const struct crypto_type *frontend,
784 u32 type, u32 mask)
785{
786 const char *name;
787
788 name = crypto_attr_alg_name(rta);
789 if (IS_ERR(name))
790 return ERR_CAST(name);
791
792 return crypto_find_alg(name, frontend, type, mask);
793}
794EXPORT_SYMBOL_GPL(crypto_attr_alg2);
795
796int crypto_attr_u32(struct rtattr *rta, u32 *num)
797{
798 struct crypto_attr_u32 *nu32;
799
800 if (!rta)
801 return -ENOENT;
802 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
803 return -EINVAL;
804 if (rta->rta_type != CRYPTOA_U32)
805 return -EINVAL;
806
807 nu32 = RTA_DATA(rta);
808 *num = nu32->num;
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(crypto_attr_u32);
813
814void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
815 unsigned int head)
816{
817 struct crypto_instance *inst;
818 char *p;
819 int err;
820
821 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
822 GFP_KERNEL);
823 if (!p)
824 return ERR_PTR(-ENOMEM);
825
826 inst = (void *)(p + head);
827
828 err = -ENAMETOOLONG;
829 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
830 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
831 goto err_free_inst;
832
833 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
834 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
835 goto err_free_inst;
836
837 return p;
838
839err_free_inst:
840 kfree(p);
841 return ERR_PTR(err);
842}
843EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
844
845struct crypto_instance *crypto_alloc_instance(const char *name,
846 struct crypto_alg *alg)
847{
848 struct crypto_instance *inst;
849 struct crypto_spawn *spawn;
850 int err;
851
852 inst = crypto_alloc_instance2(name, alg, 0);
853 if (IS_ERR(inst))
854 goto out;
855
856 spawn = crypto_instance_ctx(inst);
857 err = crypto_init_spawn(spawn, alg, inst,
858 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
859
860 if (err)
861 goto err_free_inst;
862
863 return inst;
864
865err_free_inst:
866 kfree(inst);
867 inst = ERR_PTR(err);
868
869out:
870 return inst;
871}
872EXPORT_SYMBOL_GPL(crypto_alloc_instance);
873
874void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
875{
876 INIT_LIST_HEAD(&queue->list);
877 queue->backlog = &queue->list;
878 queue->qlen = 0;
879 queue->max_qlen = max_qlen;
880}
881EXPORT_SYMBOL_GPL(crypto_init_queue);
882
883int crypto_enqueue_request(struct crypto_queue *queue,
884 struct crypto_async_request *request)
885{
886 int err = -EINPROGRESS;
887
888 if (unlikely(queue->qlen >= queue->max_qlen)) {
889 err = -EBUSY;
890 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
891 goto out;
892 if (queue->backlog == &queue->list)
893 queue->backlog = &request->list;
894 }
895
896 queue->qlen++;
897 list_add_tail(&request->list, &queue->list);
898
899out:
900 return err;
901}
902EXPORT_SYMBOL_GPL(crypto_enqueue_request);
903
904struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
905{
906 struct list_head *request;
907
908 if (unlikely(!queue->qlen))
909 return NULL;
910
911 queue->qlen--;
912
913 if (queue->backlog != &queue->list)
914 queue->backlog = queue->backlog->next;
915
916 request = queue->list.next;
917 list_del(request);
918
919 return list_entry(request, struct crypto_async_request, list);
920}
921EXPORT_SYMBOL_GPL(crypto_dequeue_request);
922
923int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
924{
925 struct crypto_async_request *req;
926
927 list_for_each_entry(req, &queue->list, list) {
928 if (req->tfm == tfm)
929 return 1;
930 }
931
932 return 0;
933}
934EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
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 for (; size >= 4; size -= 4) {
955 c = be32_to_cpu(*--b) + 1;
956 *b = cpu_to_be32(c);
957 if (c)
958 return;
959 }
960
961 crypto_inc_byte(a, size);
962}
963EXPORT_SYMBOL_GPL(crypto_inc);
964
965static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
966{
967 for (; size; size--)
968 *a++ ^= *b++;
969}
970
971void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
972{
973 u32 *a = (u32 *)dst;
974 u32 *b = (u32 *)src;
975
976 for (; size >= 4; size -= 4)
977 *a++ ^= *b++;
978
979 crypto_xor_byte((u8 *)a, (u8 *)b, size);
980}
981EXPORT_SYMBOL_GPL(crypto_xor);
982
983unsigned int crypto_alg_extsize(struct crypto_alg *alg)
984{
985 return alg->cra_ctxsize +
986 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
987}
988EXPORT_SYMBOL_GPL(crypto_alg_extsize);
989
990int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
991 u32 type, u32 mask)
992{
993 int ret = 0;
994 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
995
996 if (!IS_ERR(alg)) {
997 crypto_mod_put(alg);
998 ret = 1;
999 }
1000
1001 return ret;
1002}
1003EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1004
1005static int __init crypto_algapi_init(void)
1006{
1007 crypto_init_proc();
1008 return 0;
1009}
1010
1011static void __exit crypto_algapi_exit(void)
1012{
1013 crypto_exit_proc();
1014}
1015
1016module_init(crypto_algapi_init);
1017module_exit(crypto_algapi_exit);
1018
1019MODULE_LICENSE("GPL");
1020MODULE_DESCRIPTION("Cryptographic algorithms API");
1/*
2 * Cryptographic API for algorithms (i.e., low-level API).
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/fips.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/rtnetlink.h>
21#include <linux/slab.h>
22#include <linux/string.h>
23
24#include "internal.h"
25
26static LIST_HEAD(crypto_template_list);
27
28static inline int crypto_set_driver_name(struct crypto_alg *alg)
29{
30 static const char suffix[] = "-generic";
31 char *driver_name = alg->cra_driver_name;
32 int len;
33
34 if (*driver_name)
35 return 0;
36
37 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
38 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
39 return -ENAMETOOLONG;
40
41 memcpy(driver_name + len, suffix, sizeof(suffix));
42 return 0;
43}
44
45static inline void crypto_check_module_sig(struct module *mod)
46{
47 if (fips_enabled && mod && !module_sig_ok(mod))
48 panic("Module %s signature verification failed in FIPS mode\n",
49 module_name(mod));
50}
51
52static int crypto_check_alg(struct crypto_alg *alg)
53{
54 crypto_check_module_sig(alg->cra_module);
55
56 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
57 return -EINVAL;
58
59 if (alg->cra_blocksize > PAGE_SIZE / 8)
60 return -EINVAL;
61
62 if (alg->cra_priority < 0)
63 return -EINVAL;
64
65 refcount_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 list_move(&inst->alg.cra_list, list);
127 hlist_del(&inst->list);
128 inst->alg.cra_destroy = crypto_destroy_instance;
129
130 BUG_ON(!list_empty(&inst->alg.cra_users));
131}
132
133void crypto_remove_spawns(struct crypto_alg *alg, 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 /*
171 * We may encounter an unregistered instance here, since
172 * an instance's spawns are set up prior to the instance
173 * being registered. An unregistered instance will have
174 * NULL ->cra_users.next, since ->cra_users isn't
175 * properly initialized until registration. But an
176 * unregistered instance cannot have any users, so treat
177 * it the same as ->cra_users being empty.
178 */
179 if (spawns->next == NULL)
180 break;
181 }
182 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
183 &secondary_spawns)));
184
185 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
186 if (spawn->alg)
187 list_move(&spawn->list, &spawn->alg->cra_users);
188 else
189 crypto_remove_instance(spawn->inst, list);
190 }
191}
192EXPORT_SYMBOL_GPL(crypto_remove_spawns);
193
194static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
195{
196 struct crypto_alg *q;
197 struct crypto_larval *larval;
198 int ret = -EAGAIN;
199
200 if (crypto_is_dead(alg))
201 goto err;
202
203 INIT_LIST_HEAD(&alg->cra_users);
204
205 /* No cheating! */
206 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
207
208 ret = -EEXIST;
209
210 list_for_each_entry(q, &crypto_alg_list, cra_list) {
211 if (q == alg)
212 goto err;
213
214 if (crypto_is_moribund(q))
215 continue;
216
217 if (crypto_is_larval(q)) {
218 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
219 goto err;
220 continue;
221 }
222
223 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
224 !strcmp(q->cra_name, alg->cra_driver_name))
225 goto err;
226 }
227
228 larval = crypto_larval_alloc(alg->cra_name,
229 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
230 if (IS_ERR(larval))
231 goto out;
232
233 ret = -ENOENT;
234 larval->adult = crypto_mod_get(alg);
235 if (!larval->adult)
236 goto free_larval;
237
238 refcount_set(&larval->alg.cra_refcnt, 1);
239 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
240 CRYPTO_MAX_ALG_NAME);
241 larval->alg.cra_priority = alg->cra_priority;
242
243 list_add(&alg->cra_list, &crypto_alg_list);
244 list_add(&larval->alg.cra_list, &crypto_alg_list);
245
246out:
247 return larval;
248
249free_larval:
250 kfree(larval);
251err:
252 larval = ERR_PTR(ret);
253 goto out;
254}
255
256void crypto_alg_tested(const char *name, int err)
257{
258 struct crypto_larval *test;
259 struct crypto_alg *alg;
260 struct crypto_alg *q;
261 LIST_HEAD(list);
262
263 down_write(&crypto_alg_sem);
264 list_for_each_entry(q, &crypto_alg_list, cra_list) {
265 if (crypto_is_moribund(q) || !crypto_is_larval(q))
266 continue;
267
268 test = (struct crypto_larval *)q;
269
270 if (!strcmp(q->cra_driver_name, name))
271 goto found;
272 }
273
274 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
275 goto unlock;
276
277found:
278 q->cra_flags |= CRYPTO_ALG_DEAD;
279 alg = test->adult;
280 if (err || list_empty(&alg->cra_list))
281 goto complete;
282
283 alg->cra_flags |= CRYPTO_ALG_TESTED;
284
285 list_for_each_entry(q, &crypto_alg_list, cra_list) {
286 if (q == alg)
287 continue;
288
289 if (crypto_is_moribund(q))
290 continue;
291
292 if (crypto_is_larval(q)) {
293 struct crypto_larval *larval = (void *)q;
294
295 /*
296 * Check to see if either our generic name or
297 * specific name can satisfy the name requested
298 * by the larval entry q.
299 */
300 if (strcmp(alg->cra_name, q->cra_name) &&
301 strcmp(alg->cra_driver_name, q->cra_name))
302 continue;
303
304 if (larval->adult)
305 continue;
306 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
307 continue;
308 if (!crypto_mod_get(alg))
309 continue;
310
311 larval->adult = alg;
312 continue;
313 }
314
315 if (strcmp(alg->cra_name, q->cra_name))
316 continue;
317
318 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
319 q->cra_priority > alg->cra_priority)
320 continue;
321
322 crypto_remove_spawns(q, &list, alg);
323 }
324
325complete:
326 complete_all(&test->completion);
327
328unlock:
329 up_write(&crypto_alg_sem);
330
331 crypto_remove_final(&list);
332}
333EXPORT_SYMBOL_GPL(crypto_alg_tested);
334
335void crypto_remove_final(struct list_head *list)
336{
337 struct crypto_alg *alg;
338 struct crypto_alg *n;
339
340 list_for_each_entry_safe(alg, n, list, cra_list) {
341 list_del_init(&alg->cra_list);
342 crypto_alg_put(alg);
343 }
344}
345EXPORT_SYMBOL_GPL(crypto_remove_final);
346
347static void crypto_wait_for_test(struct crypto_larval *larval)
348{
349 int err;
350
351 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
352 if (err != NOTIFY_STOP) {
353 if (WARN_ON(err != NOTIFY_DONE))
354 goto out;
355 crypto_alg_tested(larval->alg.cra_driver_name, 0);
356 }
357
358 err = wait_for_completion_killable(&larval->completion);
359 WARN_ON(err);
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
478void crypto_unregister_template(struct crypto_template *tmpl)
479{
480 struct crypto_instance *inst;
481 struct hlist_node *n;
482 struct hlist_head *list;
483 LIST_HEAD(users);
484
485 down_write(&crypto_alg_sem);
486
487 BUG_ON(list_empty(&tmpl->list));
488 list_del_init(&tmpl->list);
489
490 list = &tmpl->instances;
491 hlist_for_each_entry(inst, list, list) {
492 int err = crypto_remove_alg(&inst->alg, &users);
493
494 BUG_ON(err);
495 }
496
497 up_write(&crypto_alg_sem);
498
499 hlist_for_each_entry_safe(inst, n, list, list) {
500 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
501 crypto_free_instance(inst);
502 }
503 crypto_remove_final(&users);
504}
505EXPORT_SYMBOL_GPL(crypto_unregister_template);
506
507static struct crypto_template *__crypto_lookup_template(const char *name)
508{
509 struct crypto_template *q, *tmpl = NULL;
510
511 down_read(&crypto_alg_sem);
512 list_for_each_entry(q, &crypto_template_list, list) {
513 if (strcmp(q->name, name))
514 continue;
515 if (unlikely(!crypto_tmpl_get(q)))
516 continue;
517
518 tmpl = q;
519 break;
520 }
521 up_read(&crypto_alg_sem);
522
523 return tmpl;
524}
525
526struct crypto_template *crypto_lookup_template(const char *name)
527{
528 return try_then_request_module(__crypto_lookup_template(name),
529 "crypto-%s", name);
530}
531EXPORT_SYMBOL_GPL(crypto_lookup_template);
532
533int crypto_register_instance(struct crypto_template *tmpl,
534 struct crypto_instance *inst)
535{
536 struct crypto_larval *larval;
537 int err;
538
539 err = crypto_check_alg(&inst->alg);
540 if (err)
541 return err;
542
543 inst->alg.cra_module = tmpl->module;
544 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
545
546 down_write(&crypto_alg_sem);
547
548 larval = __crypto_register_alg(&inst->alg);
549 if (IS_ERR(larval))
550 goto unlock;
551
552 hlist_add_head(&inst->list, &tmpl->instances);
553 inst->tmpl = tmpl;
554
555unlock:
556 up_write(&crypto_alg_sem);
557
558 err = PTR_ERR(larval);
559 if (IS_ERR(larval))
560 goto err;
561
562 crypto_wait_for_test(larval);
563 err = 0;
564
565err:
566 return err;
567}
568EXPORT_SYMBOL_GPL(crypto_register_instance);
569
570int crypto_unregister_instance(struct crypto_instance *inst)
571{
572 LIST_HEAD(list);
573
574 down_write(&crypto_alg_sem);
575
576 crypto_remove_spawns(&inst->alg, &list, NULL);
577 crypto_remove_instance(inst, &list);
578
579 up_write(&crypto_alg_sem);
580
581 crypto_remove_final(&list);
582
583 return 0;
584}
585EXPORT_SYMBOL_GPL(crypto_unregister_instance);
586
587int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
588 struct crypto_instance *inst, u32 mask)
589{
590 int err = -EAGAIN;
591
592 spawn->inst = inst;
593 spawn->mask = mask;
594
595 down_write(&crypto_alg_sem);
596 if (!crypto_is_moribund(alg)) {
597 list_add(&spawn->list, &alg->cra_users);
598 spawn->alg = alg;
599 err = 0;
600 }
601 up_write(&crypto_alg_sem);
602
603 return err;
604}
605EXPORT_SYMBOL_GPL(crypto_init_spawn);
606
607int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
608 struct crypto_instance *inst,
609 const struct crypto_type *frontend)
610{
611 int err = -EINVAL;
612
613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
614 goto out;
615
616 spawn->frontend = frontend;
617 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
618
619out:
620 return err;
621}
622EXPORT_SYMBOL_GPL(crypto_init_spawn2);
623
624int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
625 u32 type, u32 mask)
626{
627 struct crypto_alg *alg;
628 int err;
629
630 alg = crypto_find_alg(name, spawn->frontend, type, mask);
631 if (IS_ERR(alg))
632 return PTR_ERR(alg);
633
634 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
635 crypto_mod_put(alg);
636 return err;
637}
638EXPORT_SYMBOL_GPL(crypto_grab_spawn);
639
640void crypto_drop_spawn(struct crypto_spawn *spawn)
641{
642 if (!spawn->alg)
643 return;
644
645 down_write(&crypto_alg_sem);
646 list_del(&spawn->list);
647 up_write(&crypto_alg_sem);
648}
649EXPORT_SYMBOL_GPL(crypto_drop_spawn);
650
651static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
652{
653 struct crypto_alg *alg;
654 struct crypto_alg *alg2;
655
656 down_read(&crypto_alg_sem);
657 alg = spawn->alg;
658 alg2 = alg;
659 if (alg2)
660 alg2 = crypto_mod_get(alg2);
661 up_read(&crypto_alg_sem);
662
663 if (!alg2) {
664 if (alg)
665 crypto_shoot_alg(alg);
666 return ERR_PTR(-EAGAIN);
667 }
668
669 return alg;
670}
671
672struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
673 u32 mask)
674{
675 struct crypto_alg *alg;
676 struct crypto_tfm *tfm;
677
678 alg = crypto_spawn_alg(spawn);
679 if (IS_ERR(alg))
680 return ERR_CAST(alg);
681
682 tfm = ERR_PTR(-EINVAL);
683 if (unlikely((alg->cra_flags ^ type) & mask))
684 goto out_put_alg;
685
686 tfm = __crypto_alloc_tfm(alg, type, mask);
687 if (IS_ERR(tfm))
688 goto out_put_alg;
689
690 return tfm;
691
692out_put_alg:
693 crypto_mod_put(alg);
694 return tfm;
695}
696EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
697
698void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
699{
700 struct crypto_alg *alg;
701 struct crypto_tfm *tfm;
702
703 alg = crypto_spawn_alg(spawn);
704 if (IS_ERR(alg))
705 return ERR_CAST(alg);
706
707 tfm = crypto_create_tfm(alg, spawn->frontend);
708 if (IS_ERR(tfm))
709 goto out_put_alg;
710
711 return tfm;
712
713out_put_alg:
714 crypto_mod_put(alg);
715 return tfm;
716}
717EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
718
719int crypto_register_notifier(struct notifier_block *nb)
720{
721 return blocking_notifier_chain_register(&crypto_chain, nb);
722}
723EXPORT_SYMBOL_GPL(crypto_register_notifier);
724
725int crypto_unregister_notifier(struct notifier_block *nb)
726{
727 return blocking_notifier_chain_unregister(&crypto_chain, nb);
728}
729EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
730
731struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
732{
733 struct rtattr *rta = tb[0];
734 struct crypto_attr_type *algt;
735
736 if (!rta)
737 return ERR_PTR(-ENOENT);
738 if (RTA_PAYLOAD(rta) < sizeof(*algt))
739 return ERR_PTR(-EINVAL);
740 if (rta->rta_type != CRYPTOA_TYPE)
741 return ERR_PTR(-EINVAL);
742
743 algt = RTA_DATA(rta);
744
745 return algt;
746}
747EXPORT_SYMBOL_GPL(crypto_get_attr_type);
748
749int crypto_check_attr_type(struct rtattr **tb, u32 type)
750{
751 struct crypto_attr_type *algt;
752
753 algt = crypto_get_attr_type(tb);
754 if (IS_ERR(algt))
755 return PTR_ERR(algt);
756
757 if ((algt->type ^ type) & algt->mask)
758 return -EINVAL;
759
760 return 0;
761}
762EXPORT_SYMBOL_GPL(crypto_check_attr_type);
763
764const char *crypto_attr_alg_name(struct rtattr *rta)
765{
766 struct crypto_attr_alg *alga;
767
768 if (!rta)
769 return ERR_PTR(-ENOENT);
770 if (RTA_PAYLOAD(rta) < sizeof(*alga))
771 return ERR_PTR(-EINVAL);
772 if (rta->rta_type != CRYPTOA_ALG)
773 return ERR_PTR(-EINVAL);
774
775 alga = RTA_DATA(rta);
776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
777
778 return alga->name;
779}
780EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
781
782struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
783 const struct crypto_type *frontend,
784 u32 type, u32 mask)
785{
786 const char *name;
787
788 name = crypto_attr_alg_name(rta);
789 if (IS_ERR(name))
790 return ERR_CAST(name);
791
792 return crypto_find_alg(name, frontend, type, mask);
793}
794EXPORT_SYMBOL_GPL(crypto_attr_alg2);
795
796int crypto_attr_u32(struct rtattr *rta, u32 *num)
797{
798 struct crypto_attr_u32 *nu32;
799
800 if (!rta)
801 return -ENOENT;
802 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
803 return -EINVAL;
804 if (rta->rta_type != CRYPTOA_U32)
805 return -EINVAL;
806
807 nu32 = RTA_DATA(rta);
808 *num = nu32->num;
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(crypto_attr_u32);
813
814int crypto_inst_setname(struct crypto_instance *inst, const char *name,
815 struct crypto_alg *alg)
816{
817 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
818 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
819 return -ENAMETOOLONG;
820
821 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
822 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
823 return -ENAMETOOLONG;
824
825 return 0;
826}
827EXPORT_SYMBOL_GPL(crypto_inst_setname);
828
829void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
830 unsigned int head)
831{
832 struct crypto_instance *inst;
833 char *p;
834 int err;
835
836 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
837 GFP_KERNEL);
838 if (!p)
839 return ERR_PTR(-ENOMEM);
840
841 inst = (void *)(p + head);
842
843 err = crypto_inst_setname(inst, name, alg);
844 if (err)
845 goto err_free_inst;
846
847 return p;
848
849err_free_inst:
850 kfree(p);
851 return ERR_PTR(err);
852}
853EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
854
855struct crypto_instance *crypto_alloc_instance(const char *name,
856 struct crypto_alg *alg)
857{
858 struct crypto_instance *inst;
859 struct crypto_spawn *spawn;
860 int err;
861
862 inst = crypto_alloc_instance2(name, alg, 0);
863 if (IS_ERR(inst))
864 goto out;
865
866 spawn = crypto_instance_ctx(inst);
867 err = crypto_init_spawn(spawn, alg, inst,
868 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
869
870 if (err)
871 goto err_free_inst;
872
873 return inst;
874
875err_free_inst:
876 kfree(inst);
877 inst = ERR_PTR(err);
878
879out:
880 return inst;
881}
882EXPORT_SYMBOL_GPL(crypto_alloc_instance);
883
884void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
885{
886 INIT_LIST_HEAD(&queue->list);
887 queue->backlog = &queue->list;
888 queue->qlen = 0;
889 queue->max_qlen = max_qlen;
890}
891EXPORT_SYMBOL_GPL(crypto_init_queue);
892
893int crypto_enqueue_request(struct crypto_queue *queue,
894 struct crypto_async_request *request)
895{
896 int err = -EINPROGRESS;
897
898 if (unlikely(queue->qlen >= queue->max_qlen)) {
899 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
900 err = -ENOSPC;
901 goto out;
902 }
903 err = -EBUSY;
904 if (queue->backlog == &queue->list)
905 queue->backlog = &request->list;
906 }
907
908 queue->qlen++;
909 list_add_tail(&request->list, &queue->list);
910
911out:
912 return err;
913}
914EXPORT_SYMBOL_GPL(crypto_enqueue_request);
915
916struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
917{
918 struct list_head *request;
919
920 if (unlikely(!queue->qlen))
921 return NULL;
922
923 queue->qlen--;
924
925 if (queue->backlog != &queue->list)
926 queue->backlog = queue->backlog->next;
927
928 request = queue->list.next;
929 list_del(request);
930
931 return list_entry(request, struct crypto_async_request, list);
932}
933EXPORT_SYMBOL_GPL(crypto_dequeue_request);
934
935int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
936{
937 struct crypto_async_request *req;
938
939 list_for_each_entry(req, &queue->list, list) {
940 if (req->tfm == tfm)
941 return 1;
942 }
943
944 return 0;
945}
946EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
947
948static inline void crypto_inc_byte(u8 *a, unsigned int size)
949{
950 u8 *b = (a + size);
951 u8 c;
952
953 for (; size; size--) {
954 c = *--b + 1;
955 *b = c;
956 if (c)
957 break;
958 }
959}
960
961void crypto_inc(u8 *a, unsigned int size)
962{
963 __be32 *b = (__be32 *)(a + size);
964 u32 c;
965
966 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
967 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
968 for (; size >= 4; size -= 4) {
969 c = be32_to_cpu(*--b) + 1;
970 *b = cpu_to_be32(c);
971 if (likely(c))
972 return;
973 }
974
975 crypto_inc_byte(a, size);
976}
977EXPORT_SYMBOL_GPL(crypto_inc);
978
979void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
980{
981 int relalign = 0;
982
983 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
984 int size = sizeof(unsigned long);
985 int d = (((unsigned long)dst ^ (unsigned long)src1) |
986 ((unsigned long)dst ^ (unsigned long)src2)) &
987 (size - 1);
988
989 relalign = d ? 1 << __ffs(d) : size;
990
991 /*
992 * If we care about alignment, process as many bytes as
993 * needed to advance dst and src to values whose alignments
994 * equal their relative alignment. This will allow us to
995 * process the remainder of the input using optimal strides.
996 */
997 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
998 *dst++ = *src1++ ^ *src2++;
999 len--;
1000 }
1001 }
1002
1003 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1004 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
1005 dst += 8;
1006 src1 += 8;
1007 src2 += 8;
1008 len -= 8;
1009 }
1010
1011 while (len >= 4 && !(relalign & 3)) {
1012 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1013 dst += 4;
1014 src1 += 4;
1015 src2 += 4;
1016 len -= 4;
1017 }
1018
1019 while (len >= 2 && !(relalign & 1)) {
1020 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1021 dst += 2;
1022 src1 += 2;
1023 src2 += 2;
1024 len -= 2;
1025 }
1026
1027 while (len--)
1028 *dst++ = *src1++ ^ *src2++;
1029}
1030EXPORT_SYMBOL_GPL(__crypto_xor);
1031
1032unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1033{
1034 return alg->cra_ctxsize +
1035 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1036}
1037EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1038
1039int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1040 u32 type, u32 mask)
1041{
1042 int ret = 0;
1043 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1044
1045 if (!IS_ERR(alg)) {
1046 crypto_mod_put(alg);
1047 ret = 1;
1048 }
1049
1050 return ret;
1051}
1052EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1053
1054static int __init crypto_algapi_init(void)
1055{
1056 crypto_init_proc();
1057 return 0;
1058}
1059
1060static void __exit crypto_algapi_exit(void)
1061{
1062 crypto_exit_proc();
1063}
1064
1065module_init(crypto_algapi_init);
1066module_exit(crypto_algapi_exit);
1067
1068MODULE_LICENSE("GPL");
1069MODULE_DESCRIPTION("Cryptographic algorithms API");