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