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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/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");