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