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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/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");
1/*
2 * Cryptographic API for algorithms (i.e., low-level API).
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/fips.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/rtnetlink.h>
21#include <linux/slab.h>
22#include <linux/string.h>
23
24#include "internal.h"
25
26static LIST_HEAD(crypto_template_list);
27
28static inline int crypto_set_driver_name(struct crypto_alg *alg)
29{
30 static const char suffix[] = "-generic";
31 char *driver_name = alg->cra_driver_name;
32 int len;
33
34 if (*driver_name)
35 return 0;
36
37 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
38 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
39 return -ENAMETOOLONG;
40
41 memcpy(driver_name + len, suffix, sizeof(suffix));
42 return 0;
43}
44
45static inline void crypto_check_module_sig(struct module *mod)
46{
47 if (fips_enabled && mod && !module_sig_ok(mod))
48 panic("Module %s signature verification failed in FIPS mode\n",
49 module_name(mod));
50}
51
52static int crypto_check_alg(struct crypto_alg *alg)
53{
54 crypto_check_module_sig(alg->cra_module);
55
56 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
57 return -EINVAL;
58
59 if (alg->cra_blocksize > PAGE_SIZE / 8)
60 return -EINVAL;
61
62 if (alg->cra_priority < 0)
63 return -EINVAL;
64
65 refcount_set(&alg->cra_refcnt, 1);
66
67 return crypto_set_driver_name(alg);
68}
69
70static void crypto_free_instance(struct crypto_instance *inst)
71{
72 if (!inst->alg.cra_type->free) {
73 inst->tmpl->free(inst);
74 return;
75 }
76
77 inst->alg.cra_type->free(inst);
78}
79
80static void crypto_destroy_instance(struct crypto_alg *alg)
81{
82 struct crypto_instance *inst = (void *)alg;
83 struct crypto_template *tmpl = inst->tmpl;
84
85 crypto_free_instance(inst);
86 crypto_tmpl_put(tmpl);
87}
88
89static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
90 struct list_head *stack,
91 struct list_head *top,
92 struct list_head *secondary_spawns)
93{
94 struct crypto_spawn *spawn, *n;
95
96 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
97 if (!spawn)
98 return NULL;
99
100 n = list_next_entry(spawn, list);
101
102 if (spawn->alg && &n->list != stack && !n->alg)
103 n->alg = (n->list.next == stack) ? alg :
104 &list_next_entry(n, list)->inst->alg;
105
106 list_move(&spawn->list, secondary_spawns);
107
108 return &n->list == stack ? top : &n->inst->alg.cra_users;
109}
110
111static void crypto_remove_instance(struct crypto_instance *inst,
112 struct list_head *list)
113{
114 struct crypto_template *tmpl = inst->tmpl;
115
116 if (crypto_is_dead(&inst->alg))
117 return;
118
119 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
120 if (hlist_unhashed(&inst->list))
121 return;
122
123 if (!tmpl || !crypto_tmpl_get(tmpl))
124 return;
125
126 list_move(&inst->alg.cra_list, list);
127 hlist_del(&inst->list);
128 inst->alg.cra_destroy = crypto_destroy_instance;
129
130 BUG_ON(!list_empty(&inst->alg.cra_users));
131}
132
133void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
134 struct crypto_alg *nalg)
135{
136 u32 new_type = (nalg ?: alg)->cra_flags;
137 struct crypto_spawn *spawn, *n;
138 LIST_HEAD(secondary_spawns);
139 struct list_head *spawns;
140 LIST_HEAD(stack);
141 LIST_HEAD(top);
142
143 spawns = &alg->cra_users;
144 list_for_each_entry_safe(spawn, n, spawns, list) {
145 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
146 continue;
147
148 list_move(&spawn->list, &top);
149 }
150
151 spawns = ⊤
152 do {
153 while (!list_empty(spawns)) {
154 struct crypto_instance *inst;
155
156 spawn = list_first_entry(spawns, struct crypto_spawn,
157 list);
158 inst = spawn->inst;
159
160 BUG_ON(&inst->alg == alg);
161
162 list_move(&spawn->list, &stack);
163
164 if (&inst->alg == nalg)
165 break;
166
167 spawn->alg = NULL;
168 spawns = &inst->alg.cra_users;
169
170 /*
171 * We may encounter an unregistered instance here, since
172 * an instance's spawns are set up prior to the instance
173 * being registered. An unregistered instance will have
174 * NULL ->cra_users.next, since ->cra_users isn't
175 * properly initialized until registration. But an
176 * unregistered instance cannot have any users, so treat
177 * it the same as ->cra_users being empty.
178 */
179 if (spawns->next == NULL)
180 break;
181 }
182 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
183 &secondary_spawns)));
184
185 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
186 if (spawn->alg)
187 list_move(&spawn->list, &spawn->alg->cra_users);
188 else
189 crypto_remove_instance(spawn->inst, list);
190 }
191}
192EXPORT_SYMBOL_GPL(crypto_remove_spawns);
193
194static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
195{
196 struct crypto_alg *q;
197 struct crypto_larval *larval;
198 int ret = -EAGAIN;
199
200 if (crypto_is_dead(alg))
201 goto err;
202
203 INIT_LIST_HEAD(&alg->cra_users);
204
205 /* No cheating! */
206 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
207
208 ret = -EEXIST;
209
210 list_for_each_entry(q, &crypto_alg_list, cra_list) {
211 if (q == alg)
212 goto err;
213
214 if (crypto_is_moribund(q))
215 continue;
216
217 if (crypto_is_larval(q)) {
218 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
219 goto err;
220 continue;
221 }
222
223 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
224 !strcmp(q->cra_name, alg->cra_driver_name))
225 goto err;
226 }
227
228 larval = crypto_larval_alloc(alg->cra_name,
229 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
230 if (IS_ERR(larval))
231 goto out;
232
233 ret = -ENOENT;
234 larval->adult = crypto_mod_get(alg);
235 if (!larval->adult)
236 goto free_larval;
237
238 refcount_set(&larval->alg.cra_refcnt, 1);
239 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
240 CRYPTO_MAX_ALG_NAME);
241 larval->alg.cra_priority = alg->cra_priority;
242
243 list_add(&alg->cra_list, &crypto_alg_list);
244 list_add(&larval->alg.cra_list, &crypto_alg_list);
245
246out:
247 return larval;
248
249free_larval:
250 kfree(larval);
251err:
252 larval = ERR_PTR(ret);
253 goto out;
254}
255
256void crypto_alg_tested(const char *name, int err)
257{
258 struct crypto_larval *test;
259 struct crypto_alg *alg;
260 struct crypto_alg *q;
261 LIST_HEAD(list);
262
263 down_write(&crypto_alg_sem);
264 list_for_each_entry(q, &crypto_alg_list, cra_list) {
265 if (crypto_is_moribund(q) || !crypto_is_larval(q))
266 continue;
267
268 test = (struct crypto_larval *)q;
269
270 if (!strcmp(q->cra_driver_name, name))
271 goto found;
272 }
273
274 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
275 goto unlock;
276
277found:
278 q->cra_flags |= CRYPTO_ALG_DEAD;
279 alg = test->adult;
280 if (err || list_empty(&alg->cra_list))
281 goto complete;
282
283 alg->cra_flags |= CRYPTO_ALG_TESTED;
284
285 list_for_each_entry(q, &crypto_alg_list, cra_list) {
286 if (q == alg)
287 continue;
288
289 if (crypto_is_moribund(q))
290 continue;
291
292 if (crypto_is_larval(q)) {
293 struct crypto_larval *larval = (void *)q;
294
295 /*
296 * Check to see if either our generic name or
297 * specific name can satisfy the name requested
298 * by the larval entry q.
299 */
300 if (strcmp(alg->cra_name, q->cra_name) &&
301 strcmp(alg->cra_driver_name, q->cra_name))
302 continue;
303
304 if (larval->adult)
305 continue;
306 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
307 continue;
308 if (!crypto_mod_get(alg))
309 continue;
310
311 larval->adult = alg;
312 continue;
313 }
314
315 if (strcmp(alg->cra_name, q->cra_name))
316 continue;
317
318 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
319 q->cra_priority > alg->cra_priority)
320 continue;
321
322 crypto_remove_spawns(q, &list, alg);
323 }
324
325complete:
326 complete_all(&test->completion);
327
328unlock:
329 up_write(&crypto_alg_sem);
330
331 crypto_remove_final(&list);
332}
333EXPORT_SYMBOL_GPL(crypto_alg_tested);
334
335void crypto_remove_final(struct list_head *list)
336{
337 struct crypto_alg *alg;
338 struct crypto_alg *n;
339
340 list_for_each_entry_safe(alg, n, list, cra_list) {
341 list_del_init(&alg->cra_list);
342 crypto_alg_put(alg);
343 }
344}
345EXPORT_SYMBOL_GPL(crypto_remove_final);
346
347static void crypto_wait_for_test(struct crypto_larval *larval)
348{
349 int err;
350
351 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
352 if (err != NOTIFY_STOP) {
353 if (WARN_ON(err != NOTIFY_DONE))
354 goto out;
355 crypto_alg_tested(larval->alg.cra_driver_name, 0);
356 }
357
358 err = wait_for_completion_killable(&larval->completion);
359 WARN_ON(err);
360
361out:
362 crypto_larval_kill(&larval->alg);
363}
364
365int crypto_register_alg(struct crypto_alg *alg)
366{
367 struct crypto_larval *larval;
368 int err;
369
370 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
371 err = crypto_check_alg(alg);
372 if (err)
373 return err;
374
375 down_write(&crypto_alg_sem);
376 larval = __crypto_register_alg(alg);
377 up_write(&crypto_alg_sem);
378
379 if (IS_ERR(larval))
380 return PTR_ERR(larval);
381
382 crypto_wait_for_test(larval);
383 return 0;
384}
385EXPORT_SYMBOL_GPL(crypto_register_alg);
386
387static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
388{
389 if (unlikely(list_empty(&alg->cra_list)))
390 return -ENOENT;
391
392 alg->cra_flags |= CRYPTO_ALG_DEAD;
393
394 list_del_init(&alg->cra_list);
395 crypto_remove_spawns(alg, list, NULL);
396
397 return 0;
398}
399
400int crypto_unregister_alg(struct crypto_alg *alg)
401{
402 int ret;
403 LIST_HEAD(list);
404
405 down_write(&crypto_alg_sem);
406 ret = crypto_remove_alg(alg, &list);
407 up_write(&crypto_alg_sem);
408
409 if (ret)
410 return ret;
411
412 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
413 if (alg->cra_destroy)
414 alg->cra_destroy(alg);
415
416 crypto_remove_final(&list);
417 return 0;
418}
419EXPORT_SYMBOL_GPL(crypto_unregister_alg);
420
421int crypto_register_algs(struct crypto_alg *algs, int count)
422{
423 int i, ret;
424
425 for (i = 0; i < count; i++) {
426 ret = crypto_register_alg(&algs[i]);
427 if (ret)
428 goto err;
429 }
430
431 return 0;
432
433err:
434 for (--i; i >= 0; --i)
435 crypto_unregister_alg(&algs[i]);
436
437 return ret;
438}
439EXPORT_SYMBOL_GPL(crypto_register_algs);
440
441int crypto_unregister_algs(struct crypto_alg *algs, int count)
442{
443 int i, ret;
444
445 for (i = 0; i < count; i++) {
446 ret = crypto_unregister_alg(&algs[i]);
447 if (ret)
448 pr_err("Failed to unregister %s %s: %d\n",
449 algs[i].cra_driver_name, algs[i].cra_name, ret);
450 }
451
452 return 0;
453}
454EXPORT_SYMBOL_GPL(crypto_unregister_algs);
455
456int crypto_register_template(struct crypto_template *tmpl)
457{
458 struct crypto_template *q;
459 int err = -EEXIST;
460
461 down_write(&crypto_alg_sem);
462
463 crypto_check_module_sig(tmpl->module);
464
465 list_for_each_entry(q, &crypto_template_list, list) {
466 if (q == tmpl)
467 goto out;
468 }
469
470 list_add(&tmpl->list, &crypto_template_list);
471 err = 0;
472out:
473 up_write(&crypto_alg_sem);
474 return err;
475}
476EXPORT_SYMBOL_GPL(crypto_register_template);
477
478void crypto_unregister_template(struct crypto_template *tmpl)
479{
480 struct crypto_instance *inst;
481 struct hlist_node *n;
482 struct hlist_head *list;
483 LIST_HEAD(users);
484
485 down_write(&crypto_alg_sem);
486
487 BUG_ON(list_empty(&tmpl->list));
488 list_del_init(&tmpl->list);
489
490 list = &tmpl->instances;
491 hlist_for_each_entry(inst, list, list) {
492 int err = crypto_remove_alg(&inst->alg, &users);
493
494 BUG_ON(err);
495 }
496
497 up_write(&crypto_alg_sem);
498
499 hlist_for_each_entry_safe(inst, n, list, list) {
500 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
501 crypto_free_instance(inst);
502 }
503 crypto_remove_final(&users);
504}
505EXPORT_SYMBOL_GPL(crypto_unregister_template);
506
507static struct crypto_template *__crypto_lookup_template(const char *name)
508{
509 struct crypto_template *q, *tmpl = NULL;
510
511 down_read(&crypto_alg_sem);
512 list_for_each_entry(q, &crypto_template_list, list) {
513 if (strcmp(q->name, name))
514 continue;
515 if (unlikely(!crypto_tmpl_get(q)))
516 continue;
517
518 tmpl = q;
519 break;
520 }
521 up_read(&crypto_alg_sem);
522
523 return tmpl;
524}
525
526struct crypto_template *crypto_lookup_template(const char *name)
527{
528 return try_then_request_module(__crypto_lookup_template(name),
529 "crypto-%s", name);
530}
531EXPORT_SYMBOL_GPL(crypto_lookup_template);
532
533int crypto_register_instance(struct crypto_template *tmpl,
534 struct crypto_instance *inst)
535{
536 struct crypto_larval *larval;
537 int err;
538
539 err = crypto_check_alg(&inst->alg);
540 if (err)
541 return err;
542
543 inst->alg.cra_module = tmpl->module;
544 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
545
546 down_write(&crypto_alg_sem);
547
548 larval = __crypto_register_alg(&inst->alg);
549 if (IS_ERR(larval))
550 goto unlock;
551
552 hlist_add_head(&inst->list, &tmpl->instances);
553 inst->tmpl = tmpl;
554
555unlock:
556 up_write(&crypto_alg_sem);
557
558 err = PTR_ERR(larval);
559 if (IS_ERR(larval))
560 goto err;
561
562 crypto_wait_for_test(larval);
563 err = 0;
564
565err:
566 return err;
567}
568EXPORT_SYMBOL_GPL(crypto_register_instance);
569
570int crypto_unregister_instance(struct crypto_instance *inst)
571{
572 LIST_HEAD(list);
573
574 down_write(&crypto_alg_sem);
575
576 crypto_remove_spawns(&inst->alg, &list, NULL);
577 crypto_remove_instance(inst, &list);
578
579 up_write(&crypto_alg_sem);
580
581 crypto_remove_final(&list);
582
583 return 0;
584}
585EXPORT_SYMBOL_GPL(crypto_unregister_instance);
586
587int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
588 struct crypto_instance *inst, u32 mask)
589{
590 int err = -EAGAIN;
591
592 spawn->inst = inst;
593 spawn->mask = mask;
594
595 down_write(&crypto_alg_sem);
596 if (!crypto_is_moribund(alg)) {
597 list_add(&spawn->list, &alg->cra_users);
598 spawn->alg = alg;
599 err = 0;
600 }
601 up_write(&crypto_alg_sem);
602
603 return err;
604}
605EXPORT_SYMBOL_GPL(crypto_init_spawn);
606
607int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
608 struct crypto_instance *inst,
609 const struct crypto_type *frontend)
610{
611 int err = -EINVAL;
612
613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
614 goto out;
615
616 spawn->frontend = frontend;
617 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
618
619out:
620 return err;
621}
622EXPORT_SYMBOL_GPL(crypto_init_spawn2);
623
624int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
625 u32 type, u32 mask)
626{
627 struct crypto_alg *alg;
628 int err;
629
630 alg = crypto_find_alg(name, spawn->frontend, type, mask);
631 if (IS_ERR(alg))
632 return PTR_ERR(alg);
633
634 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
635 crypto_mod_put(alg);
636 return err;
637}
638EXPORT_SYMBOL_GPL(crypto_grab_spawn);
639
640void crypto_drop_spawn(struct crypto_spawn *spawn)
641{
642 if (!spawn->alg)
643 return;
644
645 down_write(&crypto_alg_sem);
646 list_del(&spawn->list);
647 up_write(&crypto_alg_sem);
648}
649EXPORT_SYMBOL_GPL(crypto_drop_spawn);
650
651static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
652{
653 struct crypto_alg *alg;
654 struct crypto_alg *alg2;
655
656 down_read(&crypto_alg_sem);
657 alg = spawn->alg;
658 alg2 = alg;
659 if (alg2)
660 alg2 = crypto_mod_get(alg2);
661 up_read(&crypto_alg_sem);
662
663 if (!alg2) {
664 if (alg)
665 crypto_shoot_alg(alg);
666 return ERR_PTR(-EAGAIN);
667 }
668
669 return alg;
670}
671
672struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
673 u32 mask)
674{
675 struct crypto_alg *alg;
676 struct crypto_tfm *tfm;
677
678 alg = crypto_spawn_alg(spawn);
679 if (IS_ERR(alg))
680 return ERR_CAST(alg);
681
682 tfm = ERR_PTR(-EINVAL);
683 if (unlikely((alg->cra_flags ^ type) & mask))
684 goto out_put_alg;
685
686 tfm = __crypto_alloc_tfm(alg, type, mask);
687 if (IS_ERR(tfm))
688 goto out_put_alg;
689
690 return tfm;
691
692out_put_alg:
693 crypto_mod_put(alg);
694 return tfm;
695}
696EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
697
698void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
699{
700 struct crypto_alg *alg;
701 struct crypto_tfm *tfm;
702
703 alg = crypto_spawn_alg(spawn);
704 if (IS_ERR(alg))
705 return ERR_CAST(alg);
706
707 tfm = crypto_create_tfm(alg, spawn->frontend);
708 if (IS_ERR(tfm))
709 goto out_put_alg;
710
711 return tfm;
712
713out_put_alg:
714 crypto_mod_put(alg);
715 return tfm;
716}
717EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
718
719int crypto_register_notifier(struct notifier_block *nb)
720{
721 return blocking_notifier_chain_register(&crypto_chain, nb);
722}
723EXPORT_SYMBOL_GPL(crypto_register_notifier);
724
725int crypto_unregister_notifier(struct notifier_block *nb)
726{
727 return blocking_notifier_chain_unregister(&crypto_chain, nb);
728}
729EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
730
731struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
732{
733 struct rtattr *rta = tb[0];
734 struct crypto_attr_type *algt;
735
736 if (!rta)
737 return ERR_PTR(-ENOENT);
738 if (RTA_PAYLOAD(rta) < sizeof(*algt))
739 return ERR_PTR(-EINVAL);
740 if (rta->rta_type != CRYPTOA_TYPE)
741 return ERR_PTR(-EINVAL);
742
743 algt = RTA_DATA(rta);
744
745 return algt;
746}
747EXPORT_SYMBOL_GPL(crypto_get_attr_type);
748
749int crypto_check_attr_type(struct rtattr **tb, u32 type)
750{
751 struct crypto_attr_type *algt;
752
753 algt = crypto_get_attr_type(tb);
754 if (IS_ERR(algt))
755 return PTR_ERR(algt);
756
757 if ((algt->type ^ type) & algt->mask)
758 return -EINVAL;
759
760 return 0;
761}
762EXPORT_SYMBOL_GPL(crypto_check_attr_type);
763
764const char *crypto_attr_alg_name(struct rtattr *rta)
765{
766 struct crypto_attr_alg *alga;
767
768 if (!rta)
769 return ERR_PTR(-ENOENT);
770 if (RTA_PAYLOAD(rta) < sizeof(*alga))
771 return ERR_PTR(-EINVAL);
772 if (rta->rta_type != CRYPTOA_ALG)
773 return ERR_PTR(-EINVAL);
774
775 alga = RTA_DATA(rta);
776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
777
778 return alga->name;
779}
780EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
781
782struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
783 const struct crypto_type *frontend,
784 u32 type, u32 mask)
785{
786 const char *name;
787
788 name = crypto_attr_alg_name(rta);
789 if (IS_ERR(name))
790 return ERR_CAST(name);
791
792 return crypto_find_alg(name, frontend, type, mask);
793}
794EXPORT_SYMBOL_GPL(crypto_attr_alg2);
795
796int crypto_attr_u32(struct rtattr *rta, u32 *num)
797{
798 struct crypto_attr_u32 *nu32;
799
800 if (!rta)
801 return -ENOENT;
802 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
803 return -EINVAL;
804 if (rta->rta_type != CRYPTOA_U32)
805 return -EINVAL;
806
807 nu32 = RTA_DATA(rta);
808 *num = nu32->num;
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(crypto_attr_u32);
813
814int crypto_inst_setname(struct crypto_instance *inst, const char *name,
815 struct crypto_alg *alg)
816{
817 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
818 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
819 return -ENAMETOOLONG;
820
821 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
822 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
823 return -ENAMETOOLONG;
824
825 return 0;
826}
827EXPORT_SYMBOL_GPL(crypto_inst_setname);
828
829void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
830 unsigned int head)
831{
832 struct crypto_instance *inst;
833 char *p;
834 int err;
835
836 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
837 GFP_KERNEL);
838 if (!p)
839 return ERR_PTR(-ENOMEM);
840
841 inst = (void *)(p + head);
842
843 err = crypto_inst_setname(inst, name, alg);
844 if (err)
845 goto err_free_inst;
846
847 return p;
848
849err_free_inst:
850 kfree(p);
851 return ERR_PTR(err);
852}
853EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
854
855struct crypto_instance *crypto_alloc_instance(const char *name,
856 struct crypto_alg *alg)
857{
858 struct crypto_instance *inst;
859 struct crypto_spawn *spawn;
860 int err;
861
862 inst = crypto_alloc_instance2(name, alg, 0);
863 if (IS_ERR(inst))
864 goto out;
865
866 spawn = crypto_instance_ctx(inst);
867 err = crypto_init_spawn(spawn, alg, inst,
868 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
869
870 if (err)
871 goto err_free_inst;
872
873 return inst;
874
875err_free_inst:
876 kfree(inst);
877 inst = ERR_PTR(err);
878
879out:
880 return inst;
881}
882EXPORT_SYMBOL_GPL(crypto_alloc_instance);
883
884void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
885{
886 INIT_LIST_HEAD(&queue->list);
887 queue->backlog = &queue->list;
888 queue->qlen = 0;
889 queue->max_qlen = max_qlen;
890}
891EXPORT_SYMBOL_GPL(crypto_init_queue);
892
893int crypto_enqueue_request(struct crypto_queue *queue,
894 struct crypto_async_request *request)
895{
896 int err = -EINPROGRESS;
897
898 if (unlikely(queue->qlen >= queue->max_qlen)) {
899 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
900 err = -ENOSPC;
901 goto out;
902 }
903 err = -EBUSY;
904 if (queue->backlog == &queue->list)
905 queue->backlog = &request->list;
906 }
907
908 queue->qlen++;
909 list_add_tail(&request->list, &queue->list);
910
911out:
912 return err;
913}
914EXPORT_SYMBOL_GPL(crypto_enqueue_request);
915
916struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
917{
918 struct list_head *request;
919
920 if (unlikely(!queue->qlen))
921 return NULL;
922
923 queue->qlen--;
924
925 if (queue->backlog != &queue->list)
926 queue->backlog = queue->backlog->next;
927
928 request = queue->list.next;
929 list_del(request);
930
931 return list_entry(request, struct crypto_async_request, list);
932}
933EXPORT_SYMBOL_GPL(crypto_dequeue_request);
934
935int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
936{
937 struct crypto_async_request *req;
938
939 list_for_each_entry(req, &queue->list, list) {
940 if (req->tfm == tfm)
941 return 1;
942 }
943
944 return 0;
945}
946EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
947
948static inline void crypto_inc_byte(u8 *a, unsigned int size)
949{
950 u8 *b = (a + size);
951 u8 c;
952
953 for (; size; size--) {
954 c = *--b + 1;
955 *b = c;
956 if (c)
957 break;
958 }
959}
960
961void crypto_inc(u8 *a, unsigned int size)
962{
963 __be32 *b = (__be32 *)(a + size);
964 u32 c;
965
966 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
967 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
968 for (; size >= 4; size -= 4) {
969 c = be32_to_cpu(*--b) + 1;
970 *b = cpu_to_be32(c);
971 if (likely(c))
972 return;
973 }
974
975 crypto_inc_byte(a, size);
976}
977EXPORT_SYMBOL_GPL(crypto_inc);
978
979void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
980{
981 int relalign = 0;
982
983 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
984 int size = sizeof(unsigned long);
985 int d = (((unsigned long)dst ^ (unsigned long)src1) |
986 ((unsigned long)dst ^ (unsigned long)src2)) &
987 (size - 1);
988
989 relalign = d ? 1 << __ffs(d) : size;
990
991 /*
992 * If we care about alignment, process as many bytes as
993 * needed to advance dst and src to values whose alignments
994 * equal their relative alignment. This will allow us to
995 * process the remainder of the input using optimal strides.
996 */
997 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
998 *dst++ = *src1++ ^ *src2++;
999 len--;
1000 }
1001 }
1002
1003 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1004 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
1005 dst += 8;
1006 src1 += 8;
1007 src2 += 8;
1008 len -= 8;
1009 }
1010
1011 while (len >= 4 && !(relalign & 3)) {
1012 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1013 dst += 4;
1014 src1 += 4;
1015 src2 += 4;
1016 len -= 4;
1017 }
1018
1019 while (len >= 2 && !(relalign & 1)) {
1020 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1021 dst += 2;
1022 src1 += 2;
1023 src2 += 2;
1024 len -= 2;
1025 }
1026
1027 while (len--)
1028 *dst++ = *src1++ ^ *src2++;
1029}
1030EXPORT_SYMBOL_GPL(__crypto_xor);
1031
1032unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1033{
1034 return alg->cra_ctxsize +
1035 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1036}
1037EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1038
1039int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1040 u32 type, u32 mask)
1041{
1042 int ret = 0;
1043 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1044
1045 if (!IS_ERR(alg)) {
1046 crypto_mod_put(alg);
1047 ret = 1;
1048 }
1049
1050 return ret;
1051}
1052EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1053
1054static int __init crypto_algapi_init(void)
1055{
1056 crypto_init_proc();
1057 return 0;
1058}
1059
1060static void __exit crypto_algapi_exit(void)
1061{
1062 crypto_exit_proc();
1063}
1064
1065module_init(crypto_algapi_init);
1066module_exit(crypto_algapi_exit);
1067
1068MODULE_LICENSE("GPL");
1069MODULE_DESCRIPTION("Cryptographic algorithms API");