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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 LIST_HEAD(crypto_template_list);
26
27static inline int crypto_set_driver_name(struct crypto_alg *alg)
28{
29 static const char suffix[] = "-generic";
30 char *driver_name = alg->cra_driver_name;
31 int len;
32
33 if (*driver_name)
34 return 0;
35
36 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
37 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
38 return -ENAMETOOLONG;
39
40 memcpy(driver_name + len, suffix, sizeof(suffix));
41 return 0;
42}
43
44static int crypto_check_alg(struct crypto_alg *alg)
45{
46 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
47 return -EINVAL;
48
49 if (alg->cra_blocksize > PAGE_SIZE / 8)
50 return -EINVAL;
51
52 if (alg->cra_priority < 0)
53 return -EINVAL;
54
55 return crypto_set_driver_name(alg);
56}
57
58static void crypto_destroy_instance(struct crypto_alg *alg)
59{
60 struct crypto_instance *inst = (void *)alg;
61 struct crypto_template *tmpl = inst->tmpl;
62
63 tmpl->free(inst);
64 crypto_tmpl_put(tmpl);
65}
66
67static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
68 struct list_head *stack,
69 struct list_head *top,
70 struct list_head *secondary_spawns)
71{
72 struct crypto_spawn *spawn, *n;
73
74 if (list_empty(stack))
75 return NULL;
76
77 spawn = list_first_entry(stack, struct crypto_spawn, list);
78 n = list_entry(spawn->list.next, struct crypto_spawn, list);
79
80 if (spawn->alg && &n->list != stack && !n->alg)
81 n->alg = (n->list.next == stack) ? alg :
82 &list_entry(n->list.next, struct crypto_spawn,
83 list)->inst->alg;
84
85 list_move(&spawn->list, secondary_spawns);
86
87 return &n->list == stack ? top : &n->inst->alg.cra_users;
88}
89
90static void crypto_remove_spawn(struct crypto_spawn *spawn,
91 struct list_head *list)
92{
93 struct crypto_instance *inst = spawn->inst;
94 struct crypto_template *tmpl = inst->tmpl;
95
96 if (crypto_is_dead(&inst->alg))
97 return;
98
99 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
100 if (hlist_unhashed(&inst->list))
101 return;
102
103 if (!tmpl || !crypto_tmpl_get(tmpl))
104 return;
105
106 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
107 list_move(&inst->alg.cra_list, list);
108 hlist_del(&inst->list);
109 inst->alg.cra_destroy = crypto_destroy_instance;
110
111 BUG_ON(!list_empty(&inst->alg.cra_users));
112}
113
114void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
115 struct crypto_alg *nalg)
116{
117 u32 new_type = (nalg ?: alg)->cra_flags;
118 struct crypto_spawn *spawn, *n;
119 LIST_HEAD(secondary_spawns);
120 struct list_head *spawns;
121 LIST_HEAD(stack);
122 LIST_HEAD(top);
123
124 spawns = &alg->cra_users;
125 list_for_each_entry_safe(spawn, n, spawns, list) {
126 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
127 continue;
128
129 list_move(&spawn->list, &top);
130 }
131
132 spawns = ⊤
133 do {
134 while (!list_empty(spawns)) {
135 struct crypto_instance *inst;
136
137 spawn = list_first_entry(spawns, struct crypto_spawn,
138 list);
139 inst = spawn->inst;
140
141 BUG_ON(&inst->alg == alg);
142
143 list_move(&spawn->list, &stack);
144
145 if (&inst->alg == nalg)
146 break;
147
148 spawn->alg = NULL;
149 spawns = &inst->alg.cra_users;
150 }
151 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
152 &secondary_spawns)));
153
154 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
155 if (spawn->alg)
156 list_move(&spawn->list, &spawn->alg->cra_users);
157 else
158 crypto_remove_spawn(spawn, list);
159 }
160}
161EXPORT_SYMBOL_GPL(crypto_remove_spawns);
162
163static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
164{
165 struct crypto_alg *q;
166 struct crypto_larval *larval;
167 int ret = -EAGAIN;
168
169 if (crypto_is_dead(alg))
170 goto err;
171
172 INIT_LIST_HEAD(&alg->cra_users);
173
174 /* No cheating! */
175 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
176
177 ret = -EEXIST;
178
179 atomic_set(&alg->cra_refcnt, 1);
180 list_for_each_entry(q, &crypto_alg_list, cra_list) {
181 if (q == alg)
182 goto err;
183
184 if (crypto_is_moribund(q))
185 continue;
186
187 if (crypto_is_larval(q)) {
188 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
189 goto err;
190 continue;
191 }
192
193 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
194 !strcmp(q->cra_name, alg->cra_driver_name))
195 goto err;
196 }
197
198 larval = crypto_larval_alloc(alg->cra_name,
199 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
200 if (IS_ERR(larval))
201 goto out;
202
203 ret = -ENOENT;
204 larval->adult = crypto_mod_get(alg);
205 if (!larval->adult)
206 goto free_larval;
207
208 atomic_set(&larval->alg.cra_refcnt, 1);
209 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
210 CRYPTO_MAX_ALG_NAME);
211 larval->alg.cra_priority = alg->cra_priority;
212
213 list_add(&alg->cra_list, &crypto_alg_list);
214 list_add(&larval->alg.cra_list, &crypto_alg_list);
215
216out:
217 return larval;
218
219free_larval:
220 kfree(larval);
221err:
222 larval = ERR_PTR(ret);
223 goto out;
224}
225
226void crypto_alg_tested(const char *name, int err)
227{
228 struct crypto_larval *test;
229 struct crypto_alg *alg;
230 struct crypto_alg *q;
231 LIST_HEAD(list);
232
233 down_write(&crypto_alg_sem);
234 list_for_each_entry(q, &crypto_alg_list, cra_list) {
235 if (crypto_is_moribund(q) || !crypto_is_larval(q))
236 continue;
237
238 test = (struct crypto_larval *)q;
239
240 if (!strcmp(q->cra_driver_name, name))
241 goto found;
242 }
243
244 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
245 goto unlock;
246
247found:
248 q->cra_flags |= CRYPTO_ALG_DEAD;
249 alg = test->adult;
250 if (err || list_empty(&alg->cra_list))
251 goto complete;
252
253 alg->cra_flags |= CRYPTO_ALG_TESTED;
254
255 list_for_each_entry(q, &crypto_alg_list, cra_list) {
256 if (q == alg)
257 continue;
258
259 if (crypto_is_moribund(q))
260 continue;
261
262 if (crypto_is_larval(q)) {
263 struct crypto_larval *larval = (void *)q;
264
265 /*
266 * Check to see if either our generic name or
267 * specific name can satisfy the name requested
268 * by the larval entry q.
269 */
270 if (strcmp(alg->cra_name, q->cra_name) &&
271 strcmp(alg->cra_driver_name, q->cra_name))
272 continue;
273
274 if (larval->adult)
275 continue;
276 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
277 continue;
278 if (!crypto_mod_get(alg))
279 continue;
280
281 larval->adult = alg;
282 continue;
283 }
284
285 if (strcmp(alg->cra_name, q->cra_name))
286 continue;
287
288 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
289 q->cra_priority > alg->cra_priority)
290 continue;
291
292 crypto_remove_spawns(q, &list, alg);
293 }
294
295complete:
296 complete_all(&test->completion);
297
298unlock:
299 up_write(&crypto_alg_sem);
300
301 crypto_remove_final(&list);
302}
303EXPORT_SYMBOL_GPL(crypto_alg_tested);
304
305void crypto_remove_final(struct list_head *list)
306{
307 struct crypto_alg *alg;
308 struct crypto_alg *n;
309
310 list_for_each_entry_safe(alg, n, list, cra_list) {
311 list_del_init(&alg->cra_list);
312 crypto_alg_put(alg);
313 }
314}
315EXPORT_SYMBOL_GPL(crypto_remove_final);
316
317static void crypto_wait_for_test(struct crypto_larval *larval)
318{
319 int err;
320
321 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
322 if (err != NOTIFY_STOP) {
323 if (WARN_ON(err != NOTIFY_DONE))
324 goto out;
325 crypto_alg_tested(larval->alg.cra_driver_name, 0);
326 }
327
328 err = wait_for_completion_interruptible(&larval->completion);
329 WARN_ON(err);
330
331out:
332 crypto_larval_kill(&larval->alg);
333}
334
335int crypto_register_alg(struct crypto_alg *alg)
336{
337 struct crypto_larval *larval;
338 int err;
339
340 err = crypto_check_alg(alg);
341 if (err)
342 return err;
343
344 down_write(&crypto_alg_sem);
345 larval = __crypto_register_alg(alg);
346 up_write(&crypto_alg_sem);
347
348 if (IS_ERR(larval))
349 return PTR_ERR(larval);
350
351 crypto_wait_for_test(larval);
352 return 0;
353}
354EXPORT_SYMBOL_GPL(crypto_register_alg);
355
356static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
357{
358 if (unlikely(list_empty(&alg->cra_list)))
359 return -ENOENT;
360
361 alg->cra_flags |= CRYPTO_ALG_DEAD;
362
363 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
364 list_del_init(&alg->cra_list);
365 crypto_remove_spawns(alg, list, NULL);
366
367 return 0;
368}
369
370int crypto_unregister_alg(struct crypto_alg *alg)
371{
372 int ret;
373 LIST_HEAD(list);
374
375 down_write(&crypto_alg_sem);
376 ret = crypto_remove_alg(alg, &list);
377 up_write(&crypto_alg_sem);
378
379 if (ret)
380 return ret;
381
382 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
383 if (alg->cra_destroy)
384 alg->cra_destroy(alg);
385
386 crypto_remove_final(&list);
387 return 0;
388}
389EXPORT_SYMBOL_GPL(crypto_unregister_alg);
390
391int crypto_register_algs(struct crypto_alg *algs, int count)
392{
393 int i, ret;
394
395 for (i = 0; i < count; i++) {
396 ret = crypto_register_alg(&algs[i]);
397 if (ret)
398 goto err;
399 }
400
401 return 0;
402
403err:
404 for (--i; i >= 0; --i)
405 crypto_unregister_alg(&algs[i]);
406
407 return ret;
408}
409EXPORT_SYMBOL_GPL(crypto_register_algs);
410
411int crypto_unregister_algs(struct crypto_alg *algs, int count)
412{
413 int i, ret;
414
415 for (i = 0; i < count; i++) {
416 ret = crypto_unregister_alg(&algs[i]);
417 if (ret)
418 pr_err("Failed to unregister %s %s: %d\n",
419 algs[i].cra_driver_name, algs[i].cra_name, ret);
420 }
421
422 return 0;
423}
424EXPORT_SYMBOL_GPL(crypto_unregister_algs);
425
426int crypto_register_template(struct crypto_template *tmpl)
427{
428 struct crypto_template *q;
429 int err = -EEXIST;
430
431 down_write(&crypto_alg_sem);
432
433 list_for_each_entry(q, &crypto_template_list, list) {
434 if (q == tmpl)
435 goto out;
436 }
437
438 list_add(&tmpl->list, &crypto_template_list);
439 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
440 err = 0;
441out:
442 up_write(&crypto_alg_sem);
443 return err;
444}
445EXPORT_SYMBOL_GPL(crypto_register_template);
446
447void crypto_unregister_template(struct crypto_template *tmpl)
448{
449 struct crypto_instance *inst;
450 struct hlist_node *n;
451 struct hlist_head *list;
452 LIST_HEAD(users);
453
454 down_write(&crypto_alg_sem);
455
456 BUG_ON(list_empty(&tmpl->list));
457 list_del_init(&tmpl->list);
458
459 list = &tmpl->instances;
460 hlist_for_each_entry(inst, list, list) {
461 int err = crypto_remove_alg(&inst->alg, &users);
462 BUG_ON(err);
463 }
464
465 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
466
467 up_write(&crypto_alg_sem);
468
469 hlist_for_each_entry_safe(inst, n, list, list) {
470 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
471 tmpl->free(inst);
472 }
473 crypto_remove_final(&users);
474}
475EXPORT_SYMBOL_GPL(crypto_unregister_template);
476
477static struct crypto_template *__crypto_lookup_template(const char *name)
478{
479 struct crypto_template *q, *tmpl = NULL;
480
481 down_read(&crypto_alg_sem);
482 list_for_each_entry(q, &crypto_template_list, list) {
483 if (strcmp(q->name, name))
484 continue;
485 if (unlikely(!crypto_tmpl_get(q)))
486 continue;
487
488 tmpl = q;
489 break;
490 }
491 up_read(&crypto_alg_sem);
492
493 return tmpl;
494}
495
496struct crypto_template *crypto_lookup_template(const char *name)
497{
498 return try_then_request_module(__crypto_lookup_template(name), "%s",
499 name);
500}
501EXPORT_SYMBOL_GPL(crypto_lookup_template);
502
503int crypto_register_instance(struct crypto_template *tmpl,
504 struct crypto_instance *inst)
505{
506 struct crypto_larval *larval;
507 int err;
508
509 err = crypto_check_alg(&inst->alg);
510 if (err)
511 goto err;
512
513 inst->alg.cra_module = tmpl->module;
514 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
515
516 down_write(&crypto_alg_sem);
517
518 larval = __crypto_register_alg(&inst->alg);
519 if (IS_ERR(larval))
520 goto unlock;
521
522 hlist_add_head(&inst->list, &tmpl->instances);
523 inst->tmpl = tmpl;
524
525unlock:
526 up_write(&crypto_alg_sem);
527
528 err = PTR_ERR(larval);
529 if (IS_ERR(larval))
530 goto err;
531
532 crypto_wait_for_test(larval);
533 err = 0;
534
535err:
536 return err;
537}
538EXPORT_SYMBOL_GPL(crypto_register_instance);
539
540int crypto_unregister_instance(struct crypto_alg *alg)
541{
542 int err;
543 struct crypto_instance *inst = (void *)alg;
544 struct crypto_template *tmpl = inst->tmpl;
545 LIST_HEAD(users);
546
547 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
548 return -EINVAL;
549
550 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
551
552 down_write(&crypto_alg_sem);
553
554 hlist_del_init(&inst->list);
555 err = crypto_remove_alg(alg, &users);
556
557 up_write(&crypto_alg_sem);
558
559 if (err)
560 return err;
561
562 tmpl->free(inst);
563 crypto_remove_final(&users);
564
565 return 0;
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_instance);
568
569int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
570 struct crypto_instance *inst, u32 mask)
571{
572 int err = -EAGAIN;
573
574 spawn->inst = inst;
575 spawn->mask = mask;
576
577 down_write(&crypto_alg_sem);
578 if (!crypto_is_moribund(alg)) {
579 list_add(&spawn->list, &alg->cra_users);
580 spawn->alg = alg;
581 err = 0;
582 }
583 up_write(&crypto_alg_sem);
584
585 return err;
586}
587EXPORT_SYMBOL_GPL(crypto_init_spawn);
588
589int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
590 struct crypto_instance *inst,
591 const struct crypto_type *frontend)
592{
593 int err = -EINVAL;
594
595 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
596 goto out;
597
598 spawn->frontend = frontend;
599 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
600
601out:
602 return err;
603}
604EXPORT_SYMBOL_GPL(crypto_init_spawn2);
605
606void crypto_drop_spawn(struct crypto_spawn *spawn)
607{
608 if (!spawn->alg)
609 return;
610
611 down_write(&crypto_alg_sem);
612 list_del(&spawn->list);
613 up_write(&crypto_alg_sem);
614}
615EXPORT_SYMBOL_GPL(crypto_drop_spawn);
616
617static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
618{
619 struct crypto_alg *alg;
620 struct crypto_alg *alg2;
621
622 down_read(&crypto_alg_sem);
623 alg = spawn->alg;
624 alg2 = alg;
625 if (alg2)
626 alg2 = crypto_mod_get(alg2);
627 up_read(&crypto_alg_sem);
628
629 if (!alg2) {
630 if (alg)
631 crypto_shoot_alg(alg);
632 return ERR_PTR(-EAGAIN);
633 }
634
635 return alg;
636}
637
638struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
639 u32 mask)
640{
641 struct crypto_alg *alg;
642 struct crypto_tfm *tfm;
643
644 alg = crypto_spawn_alg(spawn);
645 if (IS_ERR(alg))
646 return ERR_CAST(alg);
647
648 tfm = ERR_PTR(-EINVAL);
649 if (unlikely((alg->cra_flags ^ type) & mask))
650 goto out_put_alg;
651
652 tfm = __crypto_alloc_tfm(alg, type, mask);
653 if (IS_ERR(tfm))
654 goto out_put_alg;
655
656 return tfm;
657
658out_put_alg:
659 crypto_mod_put(alg);
660 return tfm;
661}
662EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
663
664void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
665{
666 struct crypto_alg *alg;
667 struct crypto_tfm *tfm;
668
669 alg = crypto_spawn_alg(spawn);
670 if (IS_ERR(alg))
671 return ERR_CAST(alg);
672
673 tfm = crypto_create_tfm(alg, spawn->frontend);
674 if (IS_ERR(tfm))
675 goto out_put_alg;
676
677 return tfm;
678
679out_put_alg:
680 crypto_mod_put(alg);
681 return tfm;
682}
683EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
684
685int crypto_register_notifier(struct notifier_block *nb)
686{
687 return blocking_notifier_chain_register(&crypto_chain, nb);
688}
689EXPORT_SYMBOL_GPL(crypto_register_notifier);
690
691int crypto_unregister_notifier(struct notifier_block *nb)
692{
693 return blocking_notifier_chain_unregister(&crypto_chain, nb);
694}
695EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
696
697struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
698{
699 struct rtattr *rta = tb[0];
700 struct crypto_attr_type *algt;
701
702 if (!rta)
703 return ERR_PTR(-ENOENT);
704 if (RTA_PAYLOAD(rta) < sizeof(*algt))
705 return ERR_PTR(-EINVAL);
706 if (rta->rta_type != CRYPTOA_TYPE)
707 return ERR_PTR(-EINVAL);
708
709 algt = RTA_DATA(rta);
710
711 return algt;
712}
713EXPORT_SYMBOL_GPL(crypto_get_attr_type);
714
715int crypto_check_attr_type(struct rtattr **tb, u32 type)
716{
717 struct crypto_attr_type *algt;
718
719 algt = crypto_get_attr_type(tb);
720 if (IS_ERR(algt))
721 return PTR_ERR(algt);
722
723 if ((algt->type ^ type) & algt->mask)
724 return -EINVAL;
725
726 return 0;
727}
728EXPORT_SYMBOL_GPL(crypto_check_attr_type);
729
730const char *crypto_attr_alg_name(struct rtattr *rta)
731{
732 struct crypto_attr_alg *alga;
733
734 if (!rta)
735 return ERR_PTR(-ENOENT);
736 if (RTA_PAYLOAD(rta) < sizeof(*alga))
737 return ERR_PTR(-EINVAL);
738 if (rta->rta_type != CRYPTOA_ALG)
739 return ERR_PTR(-EINVAL);
740
741 alga = RTA_DATA(rta);
742 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
743
744 return alga->name;
745}
746EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
747
748struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
749 const struct crypto_type *frontend,
750 u32 type, u32 mask)
751{
752 const char *name;
753
754 name = crypto_attr_alg_name(rta);
755 if (IS_ERR(name))
756 return ERR_CAST(name);
757
758 return crypto_find_alg(name, frontend, type, mask);
759}
760EXPORT_SYMBOL_GPL(crypto_attr_alg2);
761
762int crypto_attr_u32(struct rtattr *rta, u32 *num)
763{
764 struct crypto_attr_u32 *nu32;
765
766 if (!rta)
767 return -ENOENT;
768 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
769 return -EINVAL;
770 if (rta->rta_type != CRYPTOA_U32)
771 return -EINVAL;
772
773 nu32 = RTA_DATA(rta);
774 *num = nu32->num;
775
776 return 0;
777}
778EXPORT_SYMBOL_GPL(crypto_attr_u32);
779
780void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
781 unsigned int head)
782{
783 struct crypto_instance *inst;
784 char *p;
785 int err;
786
787 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
788 GFP_KERNEL);
789 if (!p)
790 return ERR_PTR(-ENOMEM);
791
792 inst = (void *)(p + head);
793
794 err = -ENAMETOOLONG;
795 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
796 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
797 goto err_free_inst;
798
799 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
800 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
801 goto err_free_inst;
802
803 return p;
804
805err_free_inst:
806 kfree(p);
807 return ERR_PTR(err);
808}
809EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
810
811struct crypto_instance *crypto_alloc_instance(const char *name,
812 struct crypto_alg *alg)
813{
814 struct crypto_instance *inst;
815 struct crypto_spawn *spawn;
816 int err;
817
818 inst = crypto_alloc_instance2(name, alg, 0);
819 if (IS_ERR(inst))
820 goto out;
821
822 spawn = crypto_instance_ctx(inst);
823 err = crypto_init_spawn(spawn, alg, inst,
824 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
825
826 if (err)
827 goto err_free_inst;
828
829 return inst;
830
831err_free_inst:
832 kfree(inst);
833 inst = ERR_PTR(err);
834
835out:
836 return inst;
837}
838EXPORT_SYMBOL_GPL(crypto_alloc_instance);
839
840void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
841{
842 INIT_LIST_HEAD(&queue->list);
843 queue->backlog = &queue->list;
844 queue->qlen = 0;
845 queue->max_qlen = max_qlen;
846}
847EXPORT_SYMBOL_GPL(crypto_init_queue);
848
849int crypto_enqueue_request(struct crypto_queue *queue,
850 struct crypto_async_request *request)
851{
852 int err = -EINPROGRESS;
853
854 if (unlikely(queue->qlen >= queue->max_qlen)) {
855 err = -EBUSY;
856 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
857 goto out;
858 if (queue->backlog == &queue->list)
859 queue->backlog = &request->list;
860 }
861
862 queue->qlen++;
863 list_add_tail(&request->list, &queue->list);
864
865out:
866 return err;
867}
868EXPORT_SYMBOL_GPL(crypto_enqueue_request);
869
870void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
871{
872 struct list_head *request;
873
874 if (unlikely(!queue->qlen))
875 return NULL;
876
877 queue->qlen--;
878
879 if (queue->backlog != &queue->list)
880 queue->backlog = queue->backlog->next;
881
882 request = queue->list.next;
883 list_del(request);
884
885 return (char *)list_entry(request, struct crypto_async_request, list) -
886 offset;
887}
888EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
889
890struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
891{
892 return __crypto_dequeue_request(queue, 0);
893}
894EXPORT_SYMBOL_GPL(crypto_dequeue_request);
895
896int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
897{
898 struct crypto_async_request *req;
899
900 list_for_each_entry(req, &queue->list, list) {
901 if (req->tfm == tfm)
902 return 1;
903 }
904
905 return 0;
906}
907EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
908
909static inline void crypto_inc_byte(u8 *a, unsigned int size)
910{
911 u8 *b = (a + size);
912 u8 c;
913
914 for (; size; size--) {
915 c = *--b + 1;
916 *b = c;
917 if (c)
918 break;
919 }
920}
921
922void crypto_inc(u8 *a, unsigned int size)
923{
924 __be32 *b = (__be32 *)(a + size);
925 u32 c;
926
927 for (; size >= 4; size -= 4) {
928 c = be32_to_cpu(*--b) + 1;
929 *b = cpu_to_be32(c);
930 if (c)
931 return;
932 }
933
934 crypto_inc_byte(a, size);
935}
936EXPORT_SYMBOL_GPL(crypto_inc);
937
938static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
939{
940 for (; size; size--)
941 *a++ ^= *b++;
942}
943
944void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
945{
946 u32 *a = (u32 *)dst;
947 u32 *b = (u32 *)src;
948
949 for (; size >= 4; size -= 4)
950 *a++ ^= *b++;
951
952 crypto_xor_byte((u8 *)a, (u8 *)b, size);
953}
954EXPORT_SYMBOL_GPL(crypto_xor);
955
956static int __init crypto_algapi_init(void)
957{
958 crypto_init_proc();
959 return 0;
960}
961
962static void __exit crypto_algapi_exit(void)
963{
964 crypto_exit_proc();
965}
966
967module_init(crypto_algapi_init);
968module_exit(crypto_algapi_exit);
969
970MODULE_LICENSE("GPL");
971MODULE_DESCRIPTION("Cryptographic algorithms API");