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Merge branch 'dev-replace-fixes-4.7' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.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 14#include <linux/errno.h>
3133d76f 15#include <linux/fips.h>
cce9e06d
HX
16#include <linux/init.h>
17#include <linux/kernel.h>
4cc7720c 18#include <linux/list.h>
cce9e06d 19#include <linux/module.h>
7fed0bf2 20#include <linux/rtnetlink.h>
5a0e3ad6 21#include <linux/slab.h>
cce9e06d
HX
22#include <linux/string.h>
23
24#include "internal.h"
25
4cc7720c
HX
26static LIST_HEAD(crypto_template_list);
27
cce9e06d
HX
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
002c77a4
JW
45static inline void crypto_check_module_sig(struct module *mod)
46{
59afdc7b 47 if (fips_enabled && mod && !module_sig_ok(mod))
002c77a4 48 panic("Module %s signature verification failed in FIPS mode\n",
bd4a7c69 49 module_name(mod));
002c77a4
JW
50}
51
4cc7720c 52static int crypto_check_alg(struct crypto_alg *alg)
cce9e06d 53{
002c77a4
JW
54 crypto_check_module_sig(alg->cra_module);
55
cce9e06d
HX
56 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
57 return -EINVAL;
58
cce9e06d
HX
59 if (alg->cra_blocksize > PAGE_SIZE / 8)
60 return -EINVAL;
61
62 if (alg->cra_priority < 0)
63 return -EINVAL;
cce9e06d 64
e9b8e5be
HX
65 atomic_set(&alg->cra_refcnt, 1);
66
4cc7720c
HX
67 return crypto_set_driver_name(alg);
68}
69
319382a6
HX
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
6bfd4809
HX
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
319382a6 85 crypto_free_instance(inst);
6bfd4809
HX
86 crypto_tmpl_put(tmpl);
87}
88
2bf29016
HX
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
304e4818
GT
96 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
97 if (!spawn)
2bf29016
HX
98 return NULL;
99
304e4818 100 n = list_next_entry(spawn, list);
2bf29016
HX
101
102 if (spawn->alg && &n->list != stack && !n->alg)
103 n->alg = (n->list.next == stack) ? alg :
304e4818 104 &list_next_entry(n, list)->inst->alg;
2bf29016
HX
105
106 list_move(&spawn->list, secondary_spawns);
107
108 return &n->list == stack ? top : &n->inst->alg.cra_users;
109}
110
1f723710
HX
111static void crypto_remove_instance(struct crypto_instance *inst,
112 struct list_head *list)
6bfd4809 113{
a73e6996 114 struct crypto_template *tmpl = inst->tmpl;
6bfd4809 115
a73e6996
HX
116 if (crypto_is_dead(&inst->alg))
117 return;
6bfd4809 118
a73e6996 119 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
38cb2419
HX
120 if (hlist_unhashed(&inst->list))
121 return;
122
a73e6996
HX
123 if (!tmpl || !crypto_tmpl_get(tmpl))
124 return;
125
126 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
127 list_move(&inst->alg.cra_list, list);
128 hlist_del(&inst->list);
129 inst->alg.cra_destroy = crypto_destroy_instance;
130
2bf29016 131 BUG_ON(!list_empty(&inst->alg.cra_users));
a73e6996
HX
132}
133
89b596ba
SK
134void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
135 struct crypto_alg *nalg)
a73e6996 136{
2bf29016 137 u32 new_type = (nalg ?: alg)->cra_flags;
a73e6996
HX
138 struct crypto_spawn *spawn, *n;
139 LIST_HEAD(secondary_spawns);
2bf29016
HX
140 struct list_head *spawns;
141 LIST_HEAD(stack);
142 LIST_HEAD(top);
6bfd4809 143
2bf29016 144 spawns = &alg->cra_users;
a73e6996
HX
145 list_for_each_entry_safe(spawn, n, spawns, list) {
146 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
6bfd4809
HX
147 continue;
148
2bf29016 149 list_move(&spawn->list, &top);
a73e6996 150 }
6bfd4809 151
2bf29016
HX
152 spawns = &top;
153 do {
154 while (!list_empty(spawns)) {
155 struct crypto_instance *inst;
156
157 spawn = list_first_entry(spawns, struct crypto_spawn,
158 list);
159 inst = spawn->inst;
160
161 BUG_ON(&inst->alg == alg);
162
163 list_move(&spawn->list, &stack);
164
165 if (&inst->alg == nalg)
166 break;
167
168 spawn->alg = NULL;
169 spawns = &inst->alg.cra_users;
170 }
171 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
172 &secondary_spawns)));
173
174 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
175 if (spawn->alg)
176 list_move(&spawn->list, &spawn->alg->cra_users);
177 else
1f723710 178 crypto_remove_instance(spawn->inst, list);
6bfd4809
HX
179 }
180}
89b596ba 181EXPORT_SYMBOL_GPL(crypto_remove_spawns);
6bfd4809 182
73d3864a 183static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
4cc7720c
HX
184{
185 struct crypto_alg *q;
73d3864a 186 struct crypto_larval *larval;
6bfd4809
HX
187 int ret = -EAGAIN;
188
189 if (crypto_is_dead(alg))
73d3864a 190 goto err;
6bfd4809
HX
191
192 INIT_LIST_HEAD(&alg->cra_users);
193
73d3864a
HX
194 /* No cheating! */
195 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
196
6bfd4809 197 ret = -EEXIST;
4cc7720c 198
cce9e06d 199 list_for_each_entry(q, &crypto_alg_list, cra_list) {
4cc7720c 200 if (q == alg)
73d3864a
HX
201 goto err;
202
b8e15992
HX
203 if (crypto_is_moribund(q))
204 continue;
205
73d3864a
HX
206 if (crypto_is_larval(q)) {
207 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
208 goto err;
209 continue;
210 }
211
212 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
213 !strcmp(q->cra_name, alg->cra_driver_name))
214 goto err;
215 }
216
217 larval = crypto_larval_alloc(alg->cra_name,
218 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
219 if (IS_ERR(larval))
220 goto out;
221
222 ret = -ENOENT;
223 larval->adult = crypto_mod_get(alg);
224 if (!larval->adult)
225 goto free_larval;
226
227 atomic_set(&larval->alg.cra_refcnt, 1);
228 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
229 CRYPTO_MAX_ALG_NAME);
230 larval->alg.cra_priority = alg->cra_priority;
231
232 list_add(&alg->cra_list, &crypto_alg_list);
233 list_add(&larval->alg.cra_list, &crypto_alg_list);
234
5357c6c4 235out:
73d3864a
HX
236 return larval;
237
238free_larval:
239 kfree(larval);
240err:
241 larval = ERR_PTR(ret);
242 goto out;
243}
244
245void crypto_alg_tested(const char *name, int err)
246{
247 struct crypto_larval *test;
248 struct crypto_alg *alg;
249 struct crypto_alg *q;
250 LIST_HEAD(list);
251
252 down_write(&crypto_alg_sem);
253 list_for_each_entry(q, &crypto_alg_list, cra_list) {
b8e15992 254 if (crypto_is_moribund(q) || !crypto_is_larval(q))
73d3864a
HX
255 continue;
256
257 test = (struct crypto_larval *)q;
258
259 if (!strcmp(q->cra_driver_name, name))
260 goto found;
261 }
262
263 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
264 goto unlock;
265
266found:
b8e15992 267 q->cra_flags |= CRYPTO_ALG_DEAD;
73d3864a
HX
268 alg = test->adult;
269 if (err || list_empty(&alg->cra_list))
270 goto complete;
271
272 alg->cra_flags |= CRYPTO_ALG_TESTED;
273
274 list_for_each_entry(q, &crypto_alg_list, cra_list) {
275 if (q == alg)
276 continue;
6bfd4809
HX
277
278 if (crypto_is_moribund(q))
279 continue;
280
281 if (crypto_is_larval(q)) {
2825982d
HX
282 struct crypto_larval *larval = (void *)q;
283
d8058480
HX
284 /*
285 * Check to see if either our generic name or
286 * specific name can satisfy the name requested
287 * by the larval entry q.
288 */
6bfd4809
HX
289 if (strcmp(alg->cra_name, q->cra_name) &&
290 strcmp(alg->cra_driver_name, q->cra_name))
291 continue;
292
293 if (larval->adult)
294 continue;
492e2b63
HX
295 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
296 continue;
2825982d
HX
297 if (!crypto_mod_get(alg))
298 continue;
6bfd4809 299
2825982d 300 larval->adult = alg;
6bfd4809 301 continue;
2825982d 302 }
6bfd4809
HX
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
2bf29016 311 crypto_remove_spawns(q, &list, alg);
cce9e06d 312 }
2825982d 313
73d3864a
HX
314complete:
315 complete_all(&test->completion);
2825982d 316
73d3864a
HX
317unlock:
318 up_write(&crypto_alg_sem);
319
320 crypto_remove_final(&list);
cce9e06d 321}
73d3864a 322EXPORT_SYMBOL_GPL(crypto_alg_tested);
4cc7720c 323
22e5b20b 324void crypto_remove_final(struct list_head *list)
6bfd4809
HX
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}
22e5b20b 334EXPORT_SYMBOL_GPL(crypto_remove_final);
6bfd4809 335
73d3864a
HX
336static void crypto_wait_for_test(struct crypto_larval *larval)
337{
338 int err;
339
340 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
341 if (err != NOTIFY_STOP) {
342 if (WARN_ON(err != NOTIFY_DONE))
343 goto out;
344 crypto_alg_tested(larval->alg.cra_driver_name, 0);
345 }
346
3fc89adb 347 err = wait_for_completion_killable(&larval->completion);
73d3864a
HX
348 WARN_ON(err);
349
350out:
351 crypto_larval_kill(&larval->alg);
352}
353
4cc7720c
HX
354int crypto_register_alg(struct crypto_alg *alg)
355{
73d3864a 356 struct crypto_larval *larval;
4cc7720c
HX
357 int err;
358
359 err = crypto_check_alg(alg);
360 if (err)
361 return err;
362
363 down_write(&crypto_alg_sem);
73d3864a 364 larval = __crypto_register_alg(alg);
4cc7720c
HX
365 up_write(&crypto_alg_sem);
366
73d3864a
HX
367 if (IS_ERR(larval))
368 return PTR_ERR(larval);
369
370 crypto_wait_for_test(larval);
371 return 0;
4cc7720c 372}
cce9e06d
HX
373EXPORT_SYMBOL_GPL(crypto_register_alg);
374
6bfd4809
HX
375static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
376{
377 if (unlikely(list_empty(&alg->cra_list)))
378 return -ENOENT;
379
380 alg->cra_flags |= CRYPTO_ALG_DEAD;
381
382 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
383 list_del_init(&alg->cra_list);
2bf29016 384 crypto_remove_spawns(alg, list, NULL);
6bfd4809
HX
385
386 return 0;
387}
388
cce9e06d
HX
389int crypto_unregister_alg(struct crypto_alg *alg)
390{
6bfd4809
HX
391 int ret;
392 LIST_HEAD(list);
5357c6c4 393
cce9e06d 394 down_write(&crypto_alg_sem);
6bfd4809 395 ret = crypto_remove_alg(alg, &list);
cce9e06d
HX
396 up_write(&crypto_alg_sem);
397
398 if (ret)
399 return ret;
400
401 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
402 if (alg->cra_destroy)
403 alg->cra_destroy(alg);
404
6bfd4809 405 crypto_remove_final(&list);
cce9e06d
HX
406 return 0;
407}
408EXPORT_SYMBOL_GPL(crypto_unregister_alg);
409
4b004346
MB
410int crypto_register_algs(struct crypto_alg *algs, int count)
411{
412 int i, ret;
413
414 for (i = 0; i < count; i++) {
415 ret = crypto_register_alg(&algs[i]);
416 if (ret)
417 goto err;
418 }
419
420 return 0;
421
422err:
423 for (--i; i >= 0; --i)
424 crypto_unregister_alg(&algs[i]);
425
426 return ret;
427}
428EXPORT_SYMBOL_GPL(crypto_register_algs);
429
430int crypto_unregister_algs(struct crypto_alg *algs, int count)
431{
432 int i, ret;
433
434 for (i = 0; i < count; i++) {
435 ret = crypto_unregister_alg(&algs[i]);
436 if (ret)
437 pr_err("Failed to unregister %s %s: %d\n",
438 algs[i].cra_driver_name, algs[i].cra_name, ret);
439 }
440
441 return 0;
442}
443EXPORT_SYMBOL_GPL(crypto_unregister_algs);
444
4cc7720c
HX
445int crypto_register_template(struct crypto_template *tmpl)
446{
447 struct crypto_template *q;
448 int err = -EEXIST;
449
450 down_write(&crypto_alg_sem);
451
002c77a4
JW
452 crypto_check_module_sig(tmpl->module);
453
4cc7720c
HX
454 list_for_each_entry(q, &crypto_template_list, list) {
455 if (q == tmpl)
456 goto out;
457 }
458
459 list_add(&tmpl->list, &crypto_template_list);
2825982d 460 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
4cc7720c
HX
461 err = 0;
462out:
463 up_write(&crypto_alg_sem);
464 return err;
465}
466EXPORT_SYMBOL_GPL(crypto_register_template);
467
468void crypto_unregister_template(struct crypto_template *tmpl)
469{
470 struct crypto_instance *inst;
b67bfe0d 471 struct hlist_node *n;
4cc7720c 472 struct hlist_head *list;
6bfd4809 473 LIST_HEAD(users);
4cc7720c
HX
474
475 down_write(&crypto_alg_sem);
476
477 BUG_ON(list_empty(&tmpl->list));
478 list_del_init(&tmpl->list);
479
480 list = &tmpl->instances;
b67bfe0d 481 hlist_for_each_entry(inst, list, list) {
6bfd4809 482 int err = crypto_remove_alg(&inst->alg, &users);
0efcb8d5 483
6bfd4809 484 BUG_ON(err);
4cc7720c
HX
485 }
486
2825982d
HX
487 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
488
4cc7720c
HX
489 up_write(&crypto_alg_sem);
490
b67bfe0d 491 hlist_for_each_entry_safe(inst, n, list, list) {
4cc7720c 492 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
319382a6 493 crypto_free_instance(inst);
4cc7720c 494 }
6bfd4809 495 crypto_remove_final(&users);
4cc7720c
HX
496}
497EXPORT_SYMBOL_GPL(crypto_unregister_template);
498
499static struct crypto_template *__crypto_lookup_template(const char *name)
500{
501 struct crypto_template *q, *tmpl = NULL;
502
503 down_read(&crypto_alg_sem);
504 list_for_each_entry(q, &crypto_template_list, list) {
505 if (strcmp(q->name, name))
506 continue;
507 if (unlikely(!crypto_tmpl_get(q)))
508 continue;
509
510 tmpl = q;
511 break;
512 }
513 up_read(&crypto_alg_sem);
514
515 return tmpl;
516}
517
518struct crypto_template *crypto_lookup_template(const char *name)
519{
4943ba16
KC
520 return try_then_request_module(__crypto_lookup_template(name),
521 "crypto-%s", name);
4cc7720c
HX
522}
523EXPORT_SYMBOL_GPL(crypto_lookup_template);
524
525int crypto_register_instance(struct crypto_template *tmpl,
526 struct crypto_instance *inst)
527{
73d3864a
HX
528 struct crypto_larval *larval;
529 int err;
4cc7720c 530
4cc7720c
HX
531 err = crypto_check_alg(&inst->alg);
532 if (err)
9c521a20
SM
533 return err;
534
4cc7720c 535 inst->alg.cra_module = tmpl->module;
64a947b1 536 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
4cc7720c 537
34c9a0ff
HX
538 if (unlikely(!crypto_mod_get(&inst->alg)))
539 return -EAGAIN;
540
4cc7720c
HX
541 down_write(&crypto_alg_sem);
542
73d3864a
HX
543 larval = __crypto_register_alg(&inst->alg);
544 if (IS_ERR(larval))
4cc7720c
HX
545 goto unlock;
546
547 hlist_add_head(&inst->list, &tmpl->instances);
548 inst->tmpl = tmpl;
549
550unlock:
551 up_write(&crypto_alg_sem);
552
73d3864a
HX
553 err = PTR_ERR(larval);
554 if (IS_ERR(larval))
555 goto err;
556
557 crypto_wait_for_test(larval);
9c521a20
SM
558
559 /* Remove instance if test failed */
560 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
561 crypto_unregister_instance(inst);
73d3864a 562 err = 0;
6bfd4809 563
4cc7720c 564err:
9c521a20 565 crypto_mod_put(&inst->alg);
4cc7720c
HX
566 return err;
567}
568EXPORT_SYMBOL_GPL(crypto_register_instance);
ce3fd840 569
87b16756 570int crypto_unregister_instance(struct crypto_instance *inst)
ce3fd840 571{
1f723710 572 LIST_HEAD(list);
ce3fd840 573
ce3fd840
SK
574 down_write(&crypto_alg_sem);
575
87b16756 576 crypto_remove_spawns(&inst->alg, &list, NULL);
1f723710 577 crypto_remove_instance(inst, &list);
ce3fd840
SK
578
579 up_write(&crypto_alg_sem);
580
1f723710 581 crypto_remove_final(&list);
ce3fd840
SK
582
583 return 0;
584}
585EXPORT_SYMBOL_GPL(crypto_unregister_instance);
4cc7720c 586
6bfd4809 587int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
a73e6996 588 struct crypto_instance *inst, u32 mask)
6bfd4809
HX
589{
590 int err = -EAGAIN;
591
592 spawn->inst = inst;
a73e6996 593 spawn->mask = mask;
6bfd4809
HX
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
97eedce1
HX
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
c614e109 613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
97eedce1
HX
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
d6ef2f19
HX
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
6bfd4809
HX
640void crypto_drop_spawn(struct crypto_spawn *spawn)
641{
7ede5a5b
HX
642 if (!spawn->alg)
643 return;
644
6bfd4809
HX
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
97eedce1 651static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
6bfd4809
HX
652{
653 struct crypto_alg *alg;
654 struct crypto_alg *alg2;
6bfd4809
HX
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
97eedce1
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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
2e306ee0
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682 tfm = ERR_PTR(-EINVAL);
683 if (unlikely((alg->cra_flags ^ type) & mask))
684 goto out_put_alg;
685
27d2a330 686 tfm = __crypto_alloc_tfm(alg, type, mask);
6bfd4809 687 if (IS_ERR(tfm))
2e306ee0
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688 goto out_put_alg;
689
690 return tfm;
6bfd4809 691
2e306ee0
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692out_put_alg:
693 crypto_mod_put(alg);
6bfd4809
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694 return tfm;
695}
696EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
697
97eedce1
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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
2825982d
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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
ebc610e5 731struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
7fed0bf2 732{
39e1ee01 733 struct rtattr *rta = tb[0];
ebc610e5
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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);
39e1ee01
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740 if (rta->rta_type != CRYPTOA_TYPE)
741 return ERR_PTR(-EINVAL);
ebc610e5
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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
68b6c7d6 764const char *crypto_attr_alg_name(struct rtattr *rta)
ebc610e5 765{
7fed0bf2
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766 struct crypto_attr_alg *alga;
767
ebc610e5
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768 if (!rta)
769 return ERR_PTR(-ENOENT);
770 if (RTA_PAYLOAD(rta) < sizeof(*alga))
7fed0bf2 771 return ERR_PTR(-EINVAL);
39e1ee01
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772 if (rta->rta_type != CRYPTOA_ALG)
773 return ERR_PTR(-EINVAL);
7fed0bf2
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774
775 alga = RTA_DATA(rta);
776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
777
68b6c7d6
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778 return alga->name;
779}
780EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
781
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782struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
783 const struct crypto_type *frontend,
784 u32 type, u32 mask)
68b6c7d6
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785{
786 const char *name;
68b6c7d6
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787
788 name = crypto_attr_alg_name(rta);
68b6c7d6 789 if (IS_ERR(name))
3e8afe35 790 return ERR_CAST(name);
68b6c7d6 791
d06854f0 792 return crypto_find_alg(name, frontend, type, mask);
7fed0bf2 793}
d06854f0 794EXPORT_SYMBOL_GPL(crypto_attr_alg2);
3c09f17c
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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);
7fed0bf2 813
70ec7bb9
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814void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
815 unsigned int head)
7fed0bf2
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816{
817 struct crypto_instance *inst;
70ec7bb9 818 char *p;
7fed0bf2
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819 int err;
820
70ec7bb9
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821 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
822 GFP_KERNEL);
823 if (!p)
7fed0bf2
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824 return ERR_PTR(-ENOMEM);
825
70ec7bb9
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826 inst = (void *)(p + head);
827
7fed0bf2
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828 err = -ENAMETOOLONG;
829 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
830 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
831 goto err_free_inst;
832
833 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
834 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
835 goto err_free_inst;
836
70ec7bb9
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837 return p;
838
839err_free_inst:
840 kfree(p);
841 return ERR_PTR(err);
842}
843EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
844
845struct crypto_instance *crypto_alloc_instance(const char *name,
846 struct crypto_alg *alg)
847{
848 struct crypto_instance *inst;
849 struct crypto_spawn *spawn;
850 int err;
851
852 inst = crypto_alloc_instance2(name, alg, 0);
853 if (IS_ERR(inst))
854 goto out;
855
7fed0bf2 856 spawn = crypto_instance_ctx(inst);
a73e6996
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857 err = crypto_init_spawn(spawn, alg, inst,
858 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
7fed0bf2
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859
860 if (err)
861 goto err_free_inst;
862
863 return inst;
864
865err_free_inst:
866 kfree(inst);
70ec7bb9
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867 inst = ERR_PTR(err);
868
869out:
870 return inst;
7fed0bf2
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871}
872EXPORT_SYMBOL_GPL(crypto_alloc_instance);
873
b5b7f088
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874void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
875{
876 INIT_LIST_HEAD(&queue->list);
877 queue->backlog = &queue->list;
878 queue->qlen = 0;
879 queue->max_qlen = max_qlen;
880}
881EXPORT_SYMBOL_GPL(crypto_init_queue);
882
883int crypto_enqueue_request(struct crypto_queue *queue,
884 struct crypto_async_request *request)
885{
886 int err = -EINPROGRESS;
887
888 if (unlikely(queue->qlen >= queue->max_qlen)) {
889 err = -EBUSY;
890 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
891 goto out;
892 if (queue->backlog == &queue->list)
893 queue->backlog = &request->list;
894 }
895
896 queue->qlen++;
897 list_add_tail(&request->list, &queue->list);
898
899out:
900 return err;
901}
902EXPORT_SYMBOL_GPL(crypto_enqueue_request);
903
31d228cc 904struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
b5b7f088
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905{
906 struct list_head *request;
907
908 if (unlikely(!queue->qlen))
909 return NULL;
910
911 queue->qlen--;
912
913 if (queue->backlog != &queue->list)
914 queue->backlog = queue->backlog->next;
915
916 request = queue->list.next;
917 list_del(request);
918
31d228cc 919 return list_entry(request, struct crypto_async_request, list);
b5b7f088
HX
920}
921EXPORT_SYMBOL_GPL(crypto_dequeue_request);
922
923int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
924{
925 struct crypto_async_request *req;
926
927 list_for_each_entry(req, &queue->list, list) {
928 if (req->tfm == tfm)
929 return 1;
930 }
931
932 return 0;
933}
934EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
935
7613636d
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936static inline void crypto_inc_byte(u8 *a, unsigned int size)
937{
938 u8 *b = (a + size);
939 u8 c;
940
941 for (; size; size--) {
942 c = *--b + 1;
943 *b = c;
944 if (c)
945 break;
946 }
947}
948
949void crypto_inc(u8 *a, unsigned int size)
950{
951 __be32 *b = (__be32 *)(a + size);
952 u32 c;
953
954 for (; size >= 4; size -= 4) {
955 c = be32_to_cpu(*--b) + 1;
956 *b = cpu_to_be32(c);
957 if (c)
958 return;
959 }
960
961 crypto_inc_byte(a, size);
962}
963EXPORT_SYMBOL_GPL(crypto_inc);
964
965static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
966{
967 for (; size; size--)
968 *a++ ^= *b++;
969}
970
971void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
972{
973 u32 *a = (u32 *)dst;
974 u32 *b = (u32 *)src;
975
976 for (; size >= 4; size -= 4)
977 *a++ ^= *b++;
978
979 crypto_xor_byte((u8 *)a, (u8 *)b, size);
980}
981EXPORT_SYMBOL_GPL(crypto_xor);
982
38d21433
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983unsigned int crypto_alg_extsize(struct crypto_alg *alg)
984{
c2110f28
HX
985 return alg->cra_ctxsize +
986 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
38d21433
HX
987}
988EXPORT_SYMBOL_GPL(crypto_alg_extsize);
989
f2aefdab
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990int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
991 u32 type, u32 mask)
992{
993 int ret = 0;
994 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
995
996 if (!IS_ERR(alg)) {
997 crypto_mod_put(alg);
998 ret = 1;
999 }
1000
1001 return ret;
1002}
1003EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1004
cce9e06d
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1005static int __init crypto_algapi_init(void)
1006{
1007 crypto_init_proc();
1008 return 0;
1009}
1010
1011static void __exit crypto_algapi_exit(void)
1012{
1013 crypto_exit_proc();
1014}
1015
1016module_init(crypto_algapi_init);
1017module_exit(crypto_algapi_exit);
1018
1019MODULE_LICENSE("GPL");
1020MODULE_DESCRIPTION("Cryptographic algorithms API");