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Merge tag 'v3.10.107' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / crypto / algapi.c
CommitLineData
cce9e06d
HX		 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
6bfd4809 13#include <linux/err.h>
cce9e06d
HX		 14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
4cc7720c 17#include <linux/list.h>
cce9e06d 18#include <linux/module.h>
7fed0bf2 19#include <linux/rtnetlink.h>
5a0e3ad6 20#include <linux/slab.h>
cce9e06d
HX		 21#include <linux/string.h>
22
23#include "internal.h"
24
4cc7720c
HX		 25static LIST_HEAD(crypto_template_list);
26
cce9e06d
HX		 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
4cc7720c 44static int crypto_check_alg(struct crypto_alg *alg)
cce9e06d 45{
cce9e06d
HX		 46 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
47 return -EINVAL;
48
cce9e06d
HX		 49 if (alg->cra_blocksize > PAGE_SIZE / 8)
50 return -EINVAL;
51
52 if (alg->cra_priority < 0)
53 return -EINVAL;
cce9e06d 54
4cc7720c
HX		 55 return crypto_set_driver_name(alg);
56}
57
6bfd4809
HX		 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
2bf29016
HX		 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
a73e6996 90static void crypto_remove_spawn(struct crypto_spawn *spawn,
2bf29016 91 struct list_head *list)
6bfd4809 92{
a73e6996
HX		 93 struct crypto_instance *inst = spawn->inst;
94 struct crypto_template *tmpl = inst->tmpl;
6bfd4809 95
a73e6996
HX		 96 if (crypto_is_dead(&inst->alg))
97 return;
6bfd4809 98
a73e6996 99 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
38cb2419
HX		 100 if (hlist_unhashed(&inst->list))
101 return;
102
a73e6996
HX		 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
2bf29016 111 BUG_ON(!list_empty(&inst->alg.cra_users));
a73e6996
HX		 112}
113
89b596ba
SK		 114void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
115 struct crypto_alg *nalg)
a73e6996 116{
2bf29016 117 u32 new_type = (nalg ?: alg)->cra_flags;
a73e6996
HX		 118 struct crypto_spawn *spawn, *n;
119 LIST_HEAD(secondary_spawns);
2bf29016
HX		 120 struct list_head *spawns;
121 LIST_HEAD(stack);
122 LIST_HEAD(top);
6bfd4809 123
2bf29016 124 spawns = &alg->cra_users;
a73e6996
HX		 125 list_for_each_entry_safe(spawn, n, spawns, list) {
126 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
6bfd4809
HX		 127 continue;
128
2bf29016 129 list_move(&spawn->list, &top);
a73e6996 130 }
6bfd4809 131
2bf29016
HX		 132 spawns = &top;
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);
6bfd4809
HX		 159 }
160}
89b596ba 161EXPORT_SYMBOL_GPL(crypto_remove_spawns);
6bfd4809 162
73d3864a 163static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
4cc7720c
HX		 164{
165 struct crypto_alg *q;
73d3864a 166 struct crypto_larval *larval;
6bfd4809
HX		 167 int ret = -EAGAIN;
168
169 if (crypto_is_dead(alg))
73d3864a 170 goto err;
6bfd4809
HX		 171
172 INIT_LIST_HEAD(&alg->cra_users);
173
73d3864a
HX		 174 /* No cheating! */
175 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
176
6bfd4809 177 ret = -EEXIST;
4cc7720c 178
2825982d 179 atomic_set(&alg->cra_refcnt, 1);
cce9e06d 180 list_for_each_entry(q, &crypto_alg_list, cra_list) {
4cc7720c 181 if (q == alg)
73d3864a
HX		 182 goto err;
183
b8e15992
HX		 184 if (crypto_is_moribund(q))
185 continue;
186
73d3864a
HX		 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
5357c6c4 216out:
73d3864a
HX		 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) {
b8e15992 235 if (crypto_is_moribund(q) || !crypto_is_larval(q))
73d3864a
HX		 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:
b8e15992 248 q->cra_flags |= CRYPTO_ALG_DEAD;
73d3864a
HX		 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;
6bfd4809
HX		 258
259 if (crypto_is_moribund(q))
260 continue;
261
262 if (crypto_is_larval(q)) {
2825982d
HX		 263 struct crypto_larval *larval = (void *)q;
264
d8058480
HX		 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 */
6bfd4809
HX		 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;
492e2b63
HX		 276 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
277 continue;
2825982d
HX		 278 if (!crypto_mod_get(alg))
279 continue;
6bfd4809 280
2825982d 281 larval->adult = alg;
6bfd4809 282 continue;
2825982d 283 }
6bfd4809
HX		 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
2bf29016 292 crypto_remove_spawns(q, &list, alg);
cce9e06d 293 }
2825982d 294
73d3864a
HX		 295complete:
296 complete_all(&test->completion);
2825982d 297
73d3864a
HX		 298unlock:
299 up_write(&crypto_alg_sem);
300
301 crypto_remove_final(&list);
cce9e06d 302}
73d3864a 303EXPORT_SYMBOL_GPL(crypto_alg_tested);
4cc7720c 304
22e5b20b 305void crypto_remove_final(struct list_head *list)
6bfd4809
HX		 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}
22e5b20b 315EXPORT_SYMBOL_GPL(crypto_remove_final);
6bfd4809 316
73d3864a
HX		 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
3f933c55 328 err = wait_for_completion_killable(&larval->completion);
73d3864a
HX		 329 WARN_ON(err);
330
331out:
332 crypto_larval_kill(&larval->alg);
333}
334
4cc7720c
HX		 335int crypto_register_alg(struct crypto_alg *alg)
336{
73d3864a 337 struct crypto_larval *larval;
4cc7720c
HX		 338 int err;
339
055d0a8d 340 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
4cc7720c
HX		 341 err = crypto_check_alg(alg);
342 if (err)
343 return err;
344
345 down_write(&crypto_alg_sem);
73d3864a 346 larval = __crypto_register_alg(alg);
4cc7720c
HX		 347 up_write(&crypto_alg_sem);
348
73d3864a
HX		 349 if (IS_ERR(larval))
350 return PTR_ERR(larval);
351
352 crypto_wait_for_test(larval);
353 return 0;
4cc7720c 354}
cce9e06d
HX		 355EXPORT_SYMBOL_GPL(crypto_register_alg);
356
6bfd4809
HX		 357static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
358{
359 if (unlikely(list_empty(&alg->cra_list)))
360 return -ENOENT;
361
362 alg->cra_flags |= CRYPTO_ALG_DEAD;
363
364 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
365 list_del_init(&alg->cra_list);
2bf29016 366 crypto_remove_spawns(alg, list, NULL);
6bfd4809
HX		 367
368 return 0;
369}
370
cce9e06d
HX		 371int crypto_unregister_alg(struct crypto_alg *alg)
372{
6bfd4809
HX		 373 int ret;
374 LIST_HEAD(list);
5357c6c4 375
cce9e06d 376 down_write(&crypto_alg_sem);
6bfd4809 377 ret = crypto_remove_alg(alg, &list);
cce9e06d
HX		 378 up_write(&crypto_alg_sem);
379
380 if (ret)
381 return ret;
382
383 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
384 if (alg->cra_destroy)
385 alg->cra_destroy(alg);
386
6bfd4809 387 crypto_remove_final(&list);
cce9e06d
HX		 388 return 0;
389}
390EXPORT_SYMBOL_GPL(crypto_unregister_alg);
391
4b004346
MB		 392int crypto_register_algs(struct crypto_alg *algs, int count)
393{
394 int i, ret;
395
396 for (i = 0; i < count; i++) {
397 ret = crypto_register_alg(&algs[i]);
398 if (ret)
399 goto err;
400 }
401
402 return 0;
403
404err:
405 for (--i; i >= 0; --i)
406 crypto_unregister_alg(&algs[i]);
407
408 return ret;
409}
410EXPORT_SYMBOL_GPL(crypto_register_algs);
411
412int crypto_unregister_algs(struct crypto_alg *algs, int count)
413{
414 int i, ret;
415
416 for (i = 0; i < count; i++) {
417 ret = crypto_unregister_alg(&algs[i]);
418 if (ret)
419 pr_err("Failed to unregister %s %s: %d\n",
420 algs[i].cra_driver_name, algs[i].cra_name, ret);
421 }
422
423 return 0;
424}
425EXPORT_SYMBOL_GPL(crypto_unregister_algs);
426
4cc7720c
HX		 427int crypto_register_template(struct crypto_template *tmpl)
428{
429 struct crypto_template *q;
430 int err = -EEXIST;
431
432 down_write(&crypto_alg_sem);
433
434 list_for_each_entry(q, &crypto_template_list, list) {
435 if (q == tmpl)
436 goto out;
437 }
438
439 list_add(&tmpl->list, &crypto_template_list);
2825982d 440 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
4cc7720c
HX		 441 err = 0;
442out:
443 up_write(&crypto_alg_sem);
444 return err;
445}
446EXPORT_SYMBOL_GPL(crypto_register_template);
447
448void crypto_unregister_template(struct crypto_template *tmpl)
449{
450 struct crypto_instance *inst;
b67bfe0d 451 struct hlist_node *n;
4cc7720c 452 struct hlist_head *list;
6bfd4809 453 LIST_HEAD(users);
4cc7720c
HX		 454
455 down_write(&crypto_alg_sem);
456
457 BUG_ON(list_empty(&tmpl->list));
458 list_del_init(&tmpl->list);
459
460 list = &tmpl->instances;
b67bfe0d 461 hlist_for_each_entry(inst, list, list) {
6bfd4809
HX		 462 int err = crypto_remove_alg(&inst->alg, &users);
463 BUG_ON(err);
4cc7720c
HX		 464 }
465
2825982d
HX		 466 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
467
4cc7720c
HX		 468 up_write(&crypto_alg_sem);
469
b67bfe0d 470 hlist_for_each_entry_safe(inst, n, list, list) {
4cc7720c
HX		 471 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
472 tmpl->free(inst);
473 }
6bfd4809 474 crypto_remove_final(&users);
4cc7720c
HX		 475}
476EXPORT_SYMBOL_GPL(crypto_unregister_template);
477
478static struct crypto_template *__crypto_lookup_template(const char *name)
479{
480 struct crypto_template *q, *tmpl = NULL;
481
482 down_read(&crypto_alg_sem);
483 list_for_each_entry(q, &crypto_template_list, list) {
484 if (strcmp(q->name, name))
485 continue;
486 if (unlikely(!crypto_tmpl_get(q)))
487 continue;
488
489 tmpl = q;
490 break;
491 }
492 up_read(&crypto_alg_sem);
493
494 return tmpl;
495}
496
497struct crypto_template *crypto_lookup_template(const char *name)
498{
f2175543
KC		 499 return try_then_request_module(__crypto_lookup_template(name),
500 "crypto-%s", name);
4cc7720c
HX		 501}
502EXPORT_SYMBOL_GPL(crypto_lookup_template);
503
504int crypto_register_instance(struct crypto_template *tmpl,
505 struct crypto_instance *inst)
506{
73d3864a
HX		 507 struct crypto_larval *larval;
508 int err;
4cc7720c 509
4cc7720c
HX		 510 err = crypto_check_alg(&inst->alg);
511 if (err)
512 goto err;
513
514 inst->alg.cra_module = tmpl->module;
64a947b1 515 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
4cc7720c
HX		 516
517 down_write(&crypto_alg_sem);
518
73d3864a
HX		 519 larval = __crypto_register_alg(&inst->alg);
520 if (IS_ERR(larval))
4cc7720c
HX		 521 goto unlock;
522
523 hlist_add_head(&inst->list, &tmpl->instances);
524 inst->tmpl = tmpl;
525
526unlock:
527 up_write(&crypto_alg_sem);
528
73d3864a
HX		 529 err = PTR_ERR(larval);
530 if (IS_ERR(larval))
531 goto err;
532
533 crypto_wait_for_test(larval);
534 err = 0;
6bfd4809 535
4cc7720c
HX		 536err:
537 return err;
538}
539EXPORT_SYMBOL_GPL(crypto_register_instance);
ce3fd840
SK		 540
541int crypto_unregister_instance(struct crypto_alg *alg)
542{
543 int err;
544 struct crypto_instance *inst = (void *)alg;
545 struct crypto_template *tmpl = inst->tmpl;
546 LIST_HEAD(users);
547
548 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
549 return -EINVAL;
550
551 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
552
553 down_write(&crypto_alg_sem);
554
555 hlist_del_init(&inst->list);
556 err = crypto_remove_alg(alg, &users);
557
558 up_write(&crypto_alg_sem);
559
560 if (err)
561 return err;
562
563 tmpl->free(inst);
564 crypto_remove_final(&users);
565
566 return 0;
567}
568EXPORT_SYMBOL_GPL(crypto_unregister_instance);
4cc7720c 569
6bfd4809 570int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
a73e6996 571 struct crypto_instance *inst, u32 mask)
6bfd4809
HX		 572{
573 int err = -EAGAIN;
574
575 spawn->inst = inst;
a73e6996 576 spawn->mask = mask;
6bfd4809
HX		 577
578 down_write(&crypto_alg_sem);
579 if (!crypto_is_moribund(alg)) {
580 list_add(&spawn->list, &alg->cra_users);
581 spawn->alg = alg;
582 err = 0;
583 }
584 up_write(&crypto_alg_sem);
585
586 return err;
587}
588EXPORT_SYMBOL_GPL(crypto_init_spawn);
589
97eedce1
HX		 590int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
591 struct crypto_instance *inst,
592 const struct crypto_type *frontend)
593{
594 int err = -EINVAL;
595
c614e109 596 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
97eedce1
HX		 597 goto out;
598
599 spawn->frontend = frontend;
600 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
601
602out:
603 return err;
604}
605EXPORT_SYMBOL_GPL(crypto_init_spawn2);
606
6bfd4809
HX		 607void crypto_drop_spawn(struct crypto_spawn *spawn)
608{
7ede5a5b
HX		 609 if (!spawn->alg)
610 return;
611
6bfd4809
HX		 612 down_write(&crypto_alg_sem);
613 list_del(&spawn->list);
614 up_write(&crypto_alg_sem);
615}
616EXPORT_SYMBOL_GPL(crypto_drop_spawn);
617
97eedce1 618static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
6bfd4809
HX		 619{
620 struct crypto_alg *alg;
621 struct crypto_alg *alg2;
6bfd4809
HX		 622
623 down_read(&crypto_alg_sem);
624 alg = spawn->alg;
625 alg2 = alg;
626 if (alg2)
627 alg2 = crypto_mod_get(alg2);
628 up_read(&crypto_alg_sem);
629
630 if (!alg2) {
631 if (alg)
632 crypto_shoot_alg(alg);
633 return ERR_PTR(-EAGAIN);
634 }
635
97eedce1
HX		 636 return alg;
637}
638
639struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
640 u32 mask)
641{
642 struct crypto_alg *alg;
643 struct crypto_tfm *tfm;
644
645 alg = crypto_spawn_alg(spawn);
646 if (IS_ERR(alg))
647 return ERR_CAST(alg);
648
2e306ee0
HX		 649 tfm = ERR_PTR(-EINVAL);
650 if (unlikely((alg->cra_flags ^ type) & mask))
651 goto out_put_alg;
652
27d2a330 653 tfm = __crypto_alloc_tfm(alg, type, mask);
6bfd4809 654 if (IS_ERR(tfm))
2e306ee0
HX		 655 goto out_put_alg;
656
657 return tfm;
6bfd4809 658
2e306ee0
HX		 659out_put_alg:
660 crypto_mod_put(alg);
6bfd4809
HX		 661 return tfm;
662}
663EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
664
97eedce1
HX		 665void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
666{
667 struct crypto_alg *alg;
668 struct crypto_tfm *tfm;
669
670 alg = crypto_spawn_alg(spawn);
671 if (IS_ERR(alg))
672 return ERR_CAST(alg);
673
674 tfm = crypto_create_tfm(alg, spawn->frontend);
675 if (IS_ERR(tfm))
676 goto out_put_alg;
677
678 return tfm;
679
680out_put_alg:
681 crypto_mod_put(alg);
682 return tfm;
683}
684EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
685
2825982d
HX		 686int crypto_register_notifier(struct notifier_block *nb)
687{
688 return blocking_notifier_chain_register(&crypto_chain, nb);
689}
690EXPORT_SYMBOL_GPL(crypto_register_notifier);
691
692int crypto_unregister_notifier(struct notifier_block *nb)
693{
694 return blocking_notifier_chain_unregister(&crypto_chain, nb);
695}
696EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
697
ebc610e5 698struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
7fed0bf2 699{
39e1ee01 700 struct rtattr *rta = tb[0];
ebc610e5
HX		 701 struct crypto_attr_type *algt;
702
703 if (!rta)
704 return ERR_PTR(-ENOENT);
705 if (RTA_PAYLOAD(rta) < sizeof(*algt))
706 return ERR_PTR(-EINVAL);
39e1ee01
HX		 707 if (rta->rta_type != CRYPTOA_TYPE)
708 return ERR_PTR(-EINVAL);
ebc610e5
HX		 709
710 algt = RTA_DATA(rta);
711
712 return algt;
713}
714EXPORT_SYMBOL_GPL(crypto_get_attr_type);
715
716int crypto_check_attr_type(struct rtattr **tb, u32 type)
717{
718 struct crypto_attr_type *algt;
719
720 algt = crypto_get_attr_type(tb);
721 if (IS_ERR(algt))
722 return PTR_ERR(algt);
723
724 if ((algt->type ^ type) & algt->mask)
725 return -EINVAL;
726
727 return 0;
728}
729EXPORT_SYMBOL_GPL(crypto_check_attr_type);
730
68b6c7d6 731const char *crypto_attr_alg_name(struct rtattr *rta)
ebc610e5 732{
7fed0bf2
HX		 733 struct crypto_attr_alg *alga;
734
ebc610e5
HX		 735 if (!rta)
736 return ERR_PTR(-ENOENT);
737 if (RTA_PAYLOAD(rta) < sizeof(*alga))
7fed0bf2 738 return ERR_PTR(-EINVAL);
39e1ee01
HX		 739 if (rta->rta_type != CRYPTOA_ALG)
740 return ERR_PTR(-EINVAL);
7fed0bf2
HX		 741
742 alga = RTA_DATA(rta);
743 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
744
68b6c7d6
HX		 745 return alga->name;
746}
747EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
748
d06854f0
HX		 749struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
750 const struct crypto_type *frontend,
751 u32 type, u32 mask)
68b6c7d6
HX		 752{
753 const char *name;
68b6c7d6
HX		 754
755 name = crypto_attr_alg_name(rta);
68b6c7d6 756 if (IS_ERR(name))
3e8afe35 757 return ERR_CAST(name);
68b6c7d6 758
d06854f0 759 return crypto_find_alg(name, frontend, type, mask);
7fed0bf2 760}
d06854f0 761EXPORT_SYMBOL_GPL(crypto_attr_alg2);
3c09f17c
HX		 762
763int crypto_attr_u32(struct rtattr *rta, u32 *num)
764{
765 struct crypto_attr_u32 *nu32;
766
767 if (!rta)
768 return -ENOENT;
769 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
770 return -EINVAL;
771 if (rta->rta_type != CRYPTOA_U32)
772 return -EINVAL;
773
774 nu32 = RTA_DATA(rta);
775 *num = nu32->num;
776
777 return 0;
778}
779EXPORT_SYMBOL_GPL(crypto_attr_u32);
7fed0bf2 780
70ec7bb9
HX		 781void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
782 unsigned int head)
7fed0bf2
HX		 783{
784 struct crypto_instance *inst;
70ec7bb9 785 char *p;
7fed0bf2
HX		 786 int err;
787
70ec7bb9
HX		 788 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
789 GFP_KERNEL);
790 if (!p)
7fed0bf2
HX		 791 return ERR_PTR(-ENOMEM);
792
70ec7bb9
HX		 793 inst = (void *)(p + head);
794
7fed0bf2
HX		 795 err = -ENAMETOOLONG;
796 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
797 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
798 goto err_free_inst;
799
800 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
801 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
802 goto err_free_inst;
803
70ec7bb9
HX		 804 return p;
805
806err_free_inst:
807 kfree(p);
808 return ERR_PTR(err);
809}
810EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
811
812struct crypto_instance *crypto_alloc_instance(const char *name,
813 struct crypto_alg *alg)
814{
815 struct crypto_instance *inst;
816 struct crypto_spawn *spawn;
817 int err;
818
819 inst = crypto_alloc_instance2(name, alg, 0);
820 if (IS_ERR(inst))
821 goto out;
822
7fed0bf2 823 spawn = crypto_instance_ctx(inst);
a73e6996
HX		 824 err = crypto_init_spawn(spawn, alg, inst,
825 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
7fed0bf2
HX		 826
827 if (err)
828 goto err_free_inst;
829
830 return inst;
831
832err_free_inst:
833 kfree(inst);
70ec7bb9
HX		 834 inst = ERR_PTR(err);
835
836out:
837 return inst;
7fed0bf2
HX		 838}
839EXPORT_SYMBOL_GPL(crypto_alloc_instance);
840
b5b7f088
HX		 841void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
842{
843 INIT_LIST_HEAD(&queue->list);
844 queue->backlog = &queue->list;
845 queue->qlen = 0;
846 queue->max_qlen = max_qlen;
847}
848EXPORT_SYMBOL_GPL(crypto_init_queue);
849
850int crypto_enqueue_request(struct crypto_queue *queue,
851 struct crypto_async_request *request)
852{
853 int err = -EINPROGRESS;
854
855 if (unlikely(queue->qlen >= queue->max_qlen)) {
856 err = -EBUSY;
857 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
858 goto out;
859 if (queue->backlog == &queue->list)
860 queue->backlog = &request->list;
861 }
862
863 queue->qlen++;
864 list_add_tail(&request->list, &queue->list);
865
866out:
867 return err;
868}
869EXPORT_SYMBOL_GPL(crypto_enqueue_request);
870
0c7d400f 871void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
b5b7f088
HX		 872{
873 struct list_head *request;
874
875 if (unlikely(!queue->qlen))
876 return NULL;
877
878 queue->qlen--;
879
880 if (queue->backlog != &queue->list)
881 queue->backlog = queue->backlog->next;
882
883 request = queue->list.next;
884 list_del(request);
885
0c7d400f
HX		 886 return (char *)list_entry(request, struct crypto_async_request, list) -
887 offset;
888}
889EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
890
891struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
892{
893 return __crypto_dequeue_request(queue, 0);
b5b7f088
HX		 894}
895EXPORT_SYMBOL_GPL(crypto_dequeue_request);
896
897int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
898{
899 struct crypto_async_request *req;
900
901 list_for_each_entry(req, &queue->list, list) {
902 if (req->tfm == tfm)
903 return 1;
904 }
905
906 return 0;
907}
908EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
909
7613636d
HX		 910static inline void crypto_inc_byte(u8 *a, unsigned int size)
911{
912 u8 *b = (a + size);
913 u8 c;
914
915 for (; size; size--) {
916 c = *--b + 1;
917 *b = c;
918 if (c)
919 break;
920 }
921}
922
923void crypto_inc(u8 *a, unsigned int size)
924{
925 __be32 *b = (__be32 *)(a + size);
926 u32 c;
927
928 for (; size >= 4; size -= 4) {
929 c = be32_to_cpu(*--b) + 1;
930 *b = cpu_to_be32(c);
931 if (c)
932 return;
933 }
934
935 crypto_inc_byte(a, size);
936}
937EXPORT_SYMBOL_GPL(crypto_inc);
938
939static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
940{
941 for (; size; size--)
942 *a++ ^= *b++;
943}
944
945void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
946{
947 u32 *a = (u32 *)dst;
948 u32 *b = (u32 *)src;
949
950 for (; size >= 4; size -= 4)
951 *a++ ^= *b++;
952
953 crypto_xor_byte((u8 *)a, (u8 *)b, size);
954}
955EXPORT_SYMBOL_GPL(crypto_xor);
956
cce9e06d
HX		 957static int __init crypto_algapi_init(void)
958{
959 crypto_init_proc();
960 return 0;
961}
962
963static void __exit crypto_algapi_exit(void)
964{
965 crypto_exit_proc();
966}
967
968module_init(crypto_algapi_init);
969module_exit(crypto_algapi_exit);
970
971MODULE_LICENSE("GPL");
972MODULE_DESCRIPTION("Cryptographic algorithms API");
kernel source for telekom puls (alcatel/mediatek)