algapi.c 20.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12
/*
 * Cryptographic API for algorithms (i.e., low-level API).
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

Herbert Xu's avatar
Herbert Xu committed
13
#include <linux/err.h>
14 15 16
#include <linux/errno.h>
#include <linux/init.h>
#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 22 23 24
#include <linux/string.h>

#include "internal.h"

25 26
static LIST_HEAD(crypto_template_list);

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
static inline int crypto_set_driver_name(struct crypto_alg *alg)
{
	static const char suffix[] = "-generic";
	char *driver_name = alg->cra_driver_name;
	int len;

	if (*driver_name)
		return 0;

	len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
		return -ENAMETOOLONG;

	memcpy(driver_name + len, suffix, sizeof(suffix));
	return 0;
}

44 45 46 47 48 49 50 51 52 53
static inline void crypto_check_module_sig(struct module *mod)
{
#ifdef CONFIG_CRYPTO_FIPS
	if (fips_enabled && mod && !mod->sig_ok)
		panic("Module %s signature verification failed in FIPS mode\n",
		      mod->name);
#endif
	return;
}

54
static int crypto_check_alg(struct crypto_alg *alg)
55
{
56 57
	crypto_check_module_sig(alg->cra_module);

58 59 60 61 62 63 64 65 66
	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
		return -EINVAL;

	if (alg->cra_blocksize > PAGE_SIZE / 8)
		return -EINVAL;

	if (alg->cra_priority < 0)
		return -EINVAL;

67 68
	atomic_set(&alg->cra_refcnt, 1);

69 70 71
	return crypto_set_driver_name(alg);
}

Herbert Xu's avatar
Herbert Xu committed
72 73 74 75 76 77 78 79 80
static void crypto_destroy_instance(struct crypto_alg *alg)
{
	struct crypto_instance *inst = (void *)alg;
	struct crypto_template *tmpl = inst->tmpl;

	tmpl->free(inst);
	crypto_tmpl_put(tmpl);
}

81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
					    struct list_head *stack,
					    struct list_head *top,
					    struct list_head *secondary_spawns)
{
	struct crypto_spawn *spawn, *n;

	if (list_empty(stack))
		return NULL;

	spawn = list_first_entry(stack, struct crypto_spawn, list);
	n = list_entry(spawn->list.next, struct crypto_spawn, list);

	if (spawn->alg && &n->list != stack && !n->alg)
		n->alg = (n->list.next == stack) ? alg :
			 &list_entry(n->list.next, struct crypto_spawn,
				     list)->inst->alg;

	list_move(&spawn->list, secondary_spawns);

	return &n->list == stack ? top : &n->inst->alg.cra_users;
}

104 105
static void crypto_remove_instance(struct crypto_instance *inst,
				   struct list_head *list)
Herbert Xu's avatar
Herbert Xu committed
106
{
107
	struct crypto_template *tmpl = inst->tmpl;
Herbert Xu's avatar
Herbert Xu committed
108

109 110
	if (crypto_is_dead(&inst->alg))
		return;
Herbert Xu's avatar
Herbert Xu committed
111

112
	inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
113 114 115
	if (hlist_unhashed(&inst->list))
		return;

116 117 118 119 120 121 122 123
	if (!tmpl || !crypto_tmpl_get(tmpl))
		return;

	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
	list_move(&inst->alg.cra_list, list);
	hlist_del(&inst->list);
	inst->alg.cra_destroy = crypto_destroy_instance;

124
	BUG_ON(!list_empty(&inst->alg.cra_users));
125 126
}

127 128
void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
			  struct crypto_alg *nalg)
129
{
130
	u32 new_type = (nalg ?: alg)->cra_flags;
131 132
	struct crypto_spawn *spawn, *n;
	LIST_HEAD(secondary_spawns);
133 134 135
	struct list_head *spawns;
	LIST_HEAD(stack);
	LIST_HEAD(top);
Herbert Xu's avatar
Herbert Xu committed
136

137
	spawns = &alg->cra_users;
138 139
	list_for_each_entry_safe(spawn, n, spawns, list) {
		if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
Herbert Xu's avatar
Herbert Xu committed
140 141
			continue;

142
		list_move(&spawn->list, &top);
143
	}
Herbert Xu's avatar
Herbert Xu committed
144

145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
	spawns = &top;
	do {
		while (!list_empty(spawns)) {
			struct crypto_instance *inst;

			spawn = list_first_entry(spawns, struct crypto_spawn,
						 list);
			inst = spawn->inst;

			BUG_ON(&inst->alg == alg);

			list_move(&spawn->list, &stack);

			if (&inst->alg == nalg)
				break;

			spawn->alg = NULL;
			spawns = &inst->alg.cra_users;
		}
	} while ((spawns = crypto_more_spawns(alg, &stack, &top,
					      &secondary_spawns)));

	list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
		if (spawn->alg)
			list_move(&spawn->list, &spawn->alg->cra_users);
		else
171
			crypto_remove_instance(spawn->inst, list);
Herbert Xu's avatar
Herbert Xu committed
172 173
	}
}
174
EXPORT_SYMBOL_GPL(crypto_remove_spawns);
Herbert Xu's avatar
Herbert Xu committed
175

176
static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
177 178
{
	struct crypto_alg *q;
179
	struct crypto_larval *larval;
Herbert Xu's avatar
Herbert Xu committed
180 181 182
	int ret = -EAGAIN;

	if (crypto_is_dead(alg))
183
		goto err;
Herbert Xu's avatar
Herbert Xu committed
184 185 186

	INIT_LIST_HEAD(&alg->cra_users);

187 188 189
	/* No cheating! */
	alg->cra_flags &= ~CRYPTO_ALG_TESTED;

Herbert Xu's avatar
Herbert Xu committed
190
	ret = -EEXIST;
191

192
	list_for_each_entry(q, &crypto_alg_list, cra_list) {
193
		if (q == alg)
194 195
			goto err;

196 197 198
		if (crypto_is_moribund(q))
			continue;

199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
		if (crypto_is_larval(q)) {
			if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
				goto err;
			continue;
		}

		if (!strcmp(q->cra_driver_name, alg->cra_name) ||
		    !strcmp(q->cra_name, alg->cra_driver_name))
			goto err;
	}

	larval = crypto_larval_alloc(alg->cra_name,
				     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
	if (IS_ERR(larval))
		goto out;

	ret = -ENOENT;
	larval->adult = crypto_mod_get(alg);
	if (!larval->adult)
		goto free_larval;

	atomic_set(&larval->alg.cra_refcnt, 1);
	memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
	       CRYPTO_MAX_ALG_NAME);
	larval->alg.cra_priority = alg->cra_priority;

	list_add(&alg->cra_list, &crypto_alg_list);
	list_add(&larval->alg.cra_list, &crypto_alg_list);

228
out:
229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
	return larval;

free_larval:
	kfree(larval);
err:
	larval = ERR_PTR(ret);
	goto out;
}

void crypto_alg_tested(const char *name, int err)
{
	struct crypto_larval *test;
	struct crypto_alg *alg;
	struct crypto_alg *q;
	LIST_HEAD(list);

	down_write(&crypto_alg_sem);
	list_for_each_entry(q, &crypto_alg_list, cra_list) {
247
		if (crypto_is_moribund(q) || !crypto_is_larval(q))
248 249 250 251 252 253 254 255 256 257 258 259
			continue;

		test = (struct crypto_larval *)q;

		if (!strcmp(q->cra_driver_name, name))
			goto found;
	}

	printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
	goto unlock;

found:
260
	q->cra_flags |= CRYPTO_ALG_DEAD;
261 262 263 264 265 266 267 268 269
	alg = test->adult;
	if (err || list_empty(&alg->cra_list))
		goto complete;

	alg->cra_flags |= CRYPTO_ALG_TESTED;

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		if (q == alg)
			continue;
Herbert Xu's avatar
Herbert Xu committed
270 271 272 273 274

		if (crypto_is_moribund(q))
			continue;

		if (crypto_is_larval(q)) {
275 276
			struct crypto_larval *larval = (void *)q;

277 278 279 280 281
			/*
			 * Check to see if either our generic name or
			 * specific name can satisfy the name requested
			 * by the larval entry q.
			 */
Herbert Xu's avatar
Herbert Xu committed
282 283 284 285 286 287
			if (strcmp(alg->cra_name, q->cra_name) &&
			    strcmp(alg->cra_driver_name, q->cra_name))
				continue;

			if (larval->adult)
				continue;
288 289
			if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
				continue;
290 291
			if (!crypto_mod_get(alg))
				continue;
Herbert Xu's avatar
Herbert Xu committed
292

293
			larval->adult = alg;
Herbert Xu's avatar
Herbert Xu committed
294
			continue;
295
		}
Herbert Xu's avatar
Herbert Xu committed
296 297 298 299 300 301 302 303

		if (strcmp(alg->cra_name, q->cra_name))
			continue;

		if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
		    q->cra_priority > alg->cra_priority)
			continue;

304
		crypto_remove_spawns(q, &list, alg);
305
	}
306

307 308
complete:
	complete_all(&test->completion);
309

310 311 312 313
unlock:
	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);
314
}
315
EXPORT_SYMBOL_GPL(crypto_alg_tested);
316

317
void crypto_remove_final(struct list_head *list)
Herbert Xu's avatar
Herbert Xu committed
318 319 320 321 322 323 324 325 326
{
	struct crypto_alg *alg;
	struct crypto_alg *n;

	list_for_each_entry_safe(alg, n, list, cra_list) {
		list_del_init(&alg->cra_list);
		crypto_alg_put(alg);
	}
}
327
EXPORT_SYMBOL_GPL(crypto_remove_final);
Herbert Xu's avatar
Herbert Xu committed
328

329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346
static void crypto_wait_for_test(struct crypto_larval *larval)
{
	int err;

	err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
	if (err != NOTIFY_STOP) {
		if (WARN_ON(err != NOTIFY_DONE))
			goto out;
		crypto_alg_tested(larval->alg.cra_driver_name, 0);
	}

	err = wait_for_completion_interruptible(&larval->completion);
	WARN_ON(err);

out:
	crypto_larval_kill(&larval->alg);
}

347 348
int crypto_register_alg(struct crypto_alg *alg)
{
349
	struct crypto_larval *larval;
350 351 352 353 354 355 356
	int err;

	err = crypto_check_alg(alg);
	if (err)
		return err;

	down_write(&crypto_alg_sem);
357
	larval = __crypto_register_alg(alg);
358 359
	up_write(&crypto_alg_sem);

360 361 362 363 364
	if (IS_ERR(larval))
		return PTR_ERR(larval);

	crypto_wait_for_test(larval);
	return 0;
365
}
366 367
EXPORT_SYMBOL_GPL(crypto_register_alg);

Herbert Xu's avatar
Herbert Xu committed
368 369 370 371 372 373 374 375 376
static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
{
	if (unlikely(list_empty(&alg->cra_list)))
		return -ENOENT;

	alg->cra_flags |= CRYPTO_ALG_DEAD;

	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
	list_del_init(&alg->cra_list);
377
	crypto_remove_spawns(alg, list, NULL);
Herbert Xu's avatar
Herbert Xu committed
378 379 380 381

	return 0;
}

382 383
int crypto_unregister_alg(struct crypto_alg *alg)
{
Herbert Xu's avatar
Herbert Xu committed
384 385
	int ret;
	LIST_HEAD(list);
386

387
	down_write(&crypto_alg_sem);
Herbert Xu's avatar
Herbert Xu committed
388
	ret = crypto_remove_alg(alg, &list);
389 390 391 392 393 394 395 396 397
	up_write(&crypto_alg_sem);

	if (ret)
		return ret;

	BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
	if (alg->cra_destroy)
		alg->cra_destroy(alg);

Herbert Xu's avatar
Herbert Xu committed
398
	crypto_remove_final(&list);
399 400 401 402
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_alg);

403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
int crypto_register_algs(struct crypto_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_alg(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_alg(&algs[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_algs);

int crypto_unregister_algs(struct crypto_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_unregister_alg(&algs[i]);
		if (ret)
			pr_err("Failed to unregister %s %s: %d\n",
			       algs[i].cra_driver_name, algs[i].cra_name, ret);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_algs);

438 439 440 441 442 443 444
int crypto_register_template(struct crypto_template *tmpl)
{
	struct crypto_template *q;
	int err = -EEXIST;

	down_write(&crypto_alg_sem);

445 446
	crypto_check_module_sig(tmpl->module);

447 448 449 450 451 452
	list_for_each_entry(q, &crypto_template_list, list) {
		if (q == tmpl)
			goto out;
	}

	list_add(&tmpl->list, &crypto_template_list);
453
	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
454 455 456 457 458 459 460 461 462 463
	err = 0;
out:
	up_write(&crypto_alg_sem);
	return err;
}
EXPORT_SYMBOL_GPL(crypto_register_template);

void crypto_unregister_template(struct crypto_template *tmpl)
{
	struct crypto_instance *inst;
464
	struct hlist_node *n;
465
	struct hlist_head *list;
Herbert Xu's avatar
Herbert Xu committed
466
	LIST_HEAD(users);
467 468 469 470 471 472 473

	down_write(&crypto_alg_sem);

	BUG_ON(list_empty(&tmpl->list));
	list_del_init(&tmpl->list);

	list = &tmpl->instances;
474
	hlist_for_each_entry(inst, list, list) {
Herbert Xu's avatar
Herbert Xu committed
475
		int err = crypto_remove_alg(&inst->alg, &users);
476

Herbert Xu's avatar
Herbert Xu committed
477
		BUG_ON(err);
478 479
	}

480 481
	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);

482 483
	up_write(&crypto_alg_sem);

484
	hlist_for_each_entry_safe(inst, n, list, list) {
485 486 487
		BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
		tmpl->free(inst);
	}
Herbert Xu's avatar
Herbert Xu committed
488
	crypto_remove_final(&users);
489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512
}
EXPORT_SYMBOL_GPL(crypto_unregister_template);

static struct crypto_template *__crypto_lookup_template(const char *name)
{
	struct crypto_template *q, *tmpl = NULL;

	down_read(&crypto_alg_sem);
	list_for_each_entry(q, &crypto_template_list, list) {
		if (strcmp(q->name, name))
			continue;
		if (unlikely(!crypto_tmpl_get(q)))
			continue;

		tmpl = q;
		break;
	}
	up_read(&crypto_alg_sem);

	return tmpl;
}

struct crypto_template *crypto_lookup_template(const char *name)
{
513 514
	return try_then_request_module(__crypto_lookup_template(name),
				       "crypto-%s", name);
515 516 517 518 519 520
}
EXPORT_SYMBOL_GPL(crypto_lookup_template);

int crypto_register_instance(struct crypto_template *tmpl,
			     struct crypto_instance *inst)
{
521 522
	struct crypto_larval *larval;
	int err;
523 524 525

	err = crypto_check_alg(&inst->alg);
	if (err)
526 527 528 529
		return err;

	if (unlikely(!crypto_mod_get(&inst->alg)))
		return -EAGAIN;
530 531

	inst->alg.cra_module = tmpl->module;
532
	inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
533 534 535

	down_write(&crypto_alg_sem);

536 537
	larval = __crypto_register_alg(&inst->alg);
	if (IS_ERR(larval))
538 539 540 541 542 543 544 545
		goto unlock;

	hlist_add_head(&inst->list, &tmpl->instances);
	inst->tmpl = tmpl;

unlock:
	up_write(&crypto_alg_sem);

546 547 548 549 550
	err = PTR_ERR(larval);
	if (IS_ERR(larval))
		goto err;

	crypto_wait_for_test(larval);
551 552 553 554

	/* Remove instance if test failed */
	if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
		crypto_unregister_instance(inst);
555
	err = 0;
Herbert Xu's avatar
Herbert Xu committed
556

557
err:
558
	crypto_mod_put(&inst->alg);
559 560 561
	return err;
}
EXPORT_SYMBOL_GPL(crypto_register_instance);
562

563
int crypto_unregister_instance(struct crypto_instance *inst)
564
{
565
	LIST_HEAD(list);
566 567 568

	down_write(&crypto_alg_sem);

569
	crypto_remove_spawns(&inst->alg, &list, NULL);
570
	crypto_remove_instance(inst, &list);
571 572 573

	up_write(&crypto_alg_sem);

574
	crypto_remove_final(&list);
575 576 577 578

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_instance);
579

Herbert Xu's avatar
Herbert Xu committed
580
int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
581
		      struct crypto_instance *inst, u32 mask)
Herbert Xu's avatar
Herbert Xu committed
582 583 584 585
{
	int err = -EAGAIN;

	spawn->inst = inst;
586
	spawn->mask = mask;
Herbert Xu's avatar
Herbert Xu committed
587 588 589 590 591 592 593 594 595 596 597 598 599

	down_write(&crypto_alg_sem);
	if (!crypto_is_moribund(alg)) {
		list_add(&spawn->list, &alg->cra_users);
		spawn->alg = alg;
		err = 0;
	}
	up_write(&crypto_alg_sem);

	return err;
}
EXPORT_SYMBOL_GPL(crypto_init_spawn);

600 601 602 603 604 605
int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
		       struct crypto_instance *inst,
		       const struct crypto_type *frontend)
{
	int err = -EINVAL;

606
	if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
607 608 609 610 611 612 613 614 615 616
		goto out;

	spawn->frontend = frontend;
	err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);

out:
	return err;
}
EXPORT_SYMBOL_GPL(crypto_init_spawn2);

Herbert Xu's avatar
Herbert Xu committed
617 618
void crypto_drop_spawn(struct crypto_spawn *spawn)
{
619 620 621
	if (!spawn->alg)
		return;

Herbert Xu's avatar
Herbert Xu committed
622 623 624 625 626 627
	down_write(&crypto_alg_sem);
	list_del(&spawn->list);
	up_write(&crypto_alg_sem);
}
EXPORT_SYMBOL_GPL(crypto_drop_spawn);

628
static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
Herbert Xu's avatar
Herbert Xu committed
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
{
	struct crypto_alg *alg;
	struct crypto_alg *alg2;

	down_read(&crypto_alg_sem);
	alg = spawn->alg;
	alg2 = alg;
	if (alg2)
		alg2 = crypto_mod_get(alg2);
	up_read(&crypto_alg_sem);

	if (!alg2) {
		if (alg)
			crypto_shoot_alg(alg);
		return ERR_PTR(-EAGAIN);
	}

646 647 648 649 650 651 652 653 654 655 656 657 658
	return alg;
}

struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
				    u32 mask)
{
	struct crypto_alg *alg;
	struct crypto_tfm *tfm;

	alg = crypto_spawn_alg(spawn);
	if (IS_ERR(alg))
		return ERR_CAST(alg);

659 660 661 662
	tfm = ERR_PTR(-EINVAL);
	if (unlikely((alg->cra_flags ^ type) & mask))
		goto out_put_alg;

663
	tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu's avatar
Herbert Xu committed
664
	if (IS_ERR(tfm))
665 666 667
		goto out_put_alg;

	return tfm;
Herbert Xu's avatar
Herbert Xu committed
668

669 670
out_put_alg:
	crypto_mod_put(alg);
Herbert Xu's avatar
Herbert Xu committed
671 672 673 674
	return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm);

675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
{
	struct crypto_alg *alg;
	struct crypto_tfm *tfm;

	alg = crypto_spawn_alg(spawn);
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	tfm = crypto_create_tfm(alg, spawn->frontend);
	if (IS_ERR(tfm))
		goto out_put_alg;

	return tfm;

out_put_alg:
	crypto_mod_put(alg);
	return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);

696 697 698 699 700 701 702 703 704 705 706 707
int crypto_register_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_register_notifier);

int crypto_unregister_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_unregister_notifier);

708
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
709
{
710
	struct rtattr *rta = tb[0];
711 712 713 714 715 716
	struct crypto_attr_type *algt;

	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*algt))
		return ERR_PTR(-EINVAL);
717 718
	if (rta->rta_type != CRYPTOA_TYPE)
		return ERR_PTR(-EINVAL);
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740

	algt = RTA_DATA(rta);

	return algt;
}
EXPORT_SYMBOL_GPL(crypto_get_attr_type);

int crypto_check_attr_type(struct rtattr **tb, u32 type)
{
	struct crypto_attr_type *algt;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return PTR_ERR(algt);

	if ((algt->type ^ type) & algt->mask)
		return -EINVAL;

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_check_attr_type);

741
const char *crypto_attr_alg_name(struct rtattr *rta)
742
{
743 744
	struct crypto_attr_alg *alga;

745 746 747
	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*alga))
748
		return ERR_PTR(-EINVAL);
749 750
	if (rta->rta_type != CRYPTOA_ALG)
		return ERR_PTR(-EINVAL);
751 752 753 754

	alga = RTA_DATA(rta);
	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;

755 756 757 758
	return alga->name;
}
EXPORT_SYMBOL_GPL(crypto_attr_alg_name);

759 760 761
struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
				    const struct crypto_type *frontend,
				    u32 type, u32 mask)
762 763 764 765 766
{
	const char *name;

	name = crypto_attr_alg_name(rta);
	if (IS_ERR(name))
Julia Lawall's avatar
Julia Lawall committed
767
		return ERR_CAST(name);
768

769
	return crypto_find_alg(name, frontend, type, mask);
770
}
771
EXPORT_SYMBOL_GPL(crypto_attr_alg2);
Herbert Xu's avatar
Herbert Xu committed
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789

int crypto_attr_u32(struct rtattr *rta, u32 *num)
{
	struct crypto_attr_u32 *nu32;

	if (!rta)
		return -ENOENT;
	if (RTA_PAYLOAD(rta) < sizeof(*nu32))
		return -EINVAL;
	if (rta->rta_type != CRYPTOA_U32)
		return -EINVAL;

	nu32 = RTA_DATA(rta);
	*num = nu32->num;

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_attr_u32);
790

791 792
void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
			     unsigned int head)
793 794
{
	struct crypto_instance *inst;
795
	char *p;
796 797
	int err;

798 799 800
	p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
		    GFP_KERNEL);
	if (!p)
801 802
		return ERR_PTR(-ENOMEM);

803 804
	inst = (void *)(p + head);

805 806 807 808 809 810 811 812 813
	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
		     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
	return p;

err_free_inst:
	kfree(p);
	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance2);

struct crypto_instance *crypto_alloc_instance(const char *name,
					      struct crypto_alg *alg)
{
	struct crypto_instance *inst;
	struct crypto_spawn *spawn;
	int err;

	inst = crypto_alloc_instance2(name, alg, 0);
	if (IS_ERR(inst))
		goto out;

833
	spawn = crypto_instance_ctx(inst);
834 835
	err = crypto_init_spawn(spawn, alg, inst,
				CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
836 837 838 839 840 841 842 843

	if (err)
		goto err_free_inst;

	return inst;

err_free_inst:
	kfree(inst);
844 845 846 847
	inst = ERR_PTR(err);

out:
	return inst;
848 849 850
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance);

851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
{
	INIT_LIST_HEAD(&queue->list);
	queue->backlog = &queue->list;
	queue->qlen = 0;
	queue->max_qlen = max_qlen;
}
EXPORT_SYMBOL_GPL(crypto_init_queue);

int crypto_enqueue_request(struct crypto_queue *queue,
			   struct crypto_async_request *request)
{
	int err = -EINPROGRESS;

	if (unlikely(queue->qlen >= queue->max_qlen)) {
		err = -EBUSY;
		if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
			goto out;
		if (queue->backlog == &queue->list)
			queue->backlog = &request->list;
	}

	queue->qlen++;
	list_add_tail(&request->list, &queue->list);

out:
	return err;
}
EXPORT_SYMBOL_GPL(crypto_enqueue_request);

881
void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
882 883 884 885 886 887 888 889 890 891 892 893 894 895
{
	struct list_head *request;

	if (unlikely(!queue->qlen))
		return NULL;

	queue->qlen--;

	if (queue->backlog != &queue->list)
		queue->backlog = queue->backlog->next;

	request = queue->list.next;
	list_del(request);

896 897 898 899 900 901 902 903
	return (char *)list_entry(request, struct crypto_async_request, list) -
	       offset;
}
EXPORT_SYMBOL_GPL(__crypto_dequeue_request);

struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
{
	return __crypto_dequeue_request(queue, 0);
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
}
EXPORT_SYMBOL_GPL(crypto_dequeue_request);

int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
{
	struct crypto_async_request *req;

	list_for_each_entry(req, &queue->list, list) {
		if (req->tfm == tfm)
			return 1;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);

920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
static inline void crypto_inc_byte(u8 *a, unsigned int size)
{
	u8 *b = (a + size);
	u8 c;

	for (; size; size--) {
		c = *--b + 1;
		*b = c;
		if (c)
			break;
	}
}

void crypto_inc(u8 *a, unsigned int size)
{
	__be32 *b = (__be32 *)(a + size);
	u32 c;

	for (; size >= 4; size -= 4) {
		c = be32_to_cpu(*--b) + 1;
		*b = cpu_to_be32(c);
		if (c)
			return;
	}

	crypto_inc_byte(a, size);
}
EXPORT_SYMBOL_GPL(crypto_inc);

static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
{
	for (; size; size--)
		*a++ ^= *b++;
}

void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
{
	u32 *a = (u32 *)dst;
	u32 *b = (u32 *)src;

	for (; size >= 4; size -= 4)
		*a++ ^= *b++;

	crypto_xor_byte((u8 *)a, (u8 *)b, size);
}
EXPORT_SYMBOL_GPL(crypto_xor);

967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982
static int __init crypto_algapi_init(void)
{
	crypto_init_proc();
	return 0;
}

static void __exit crypto_algapi_exit(void)
{
	crypto_exit_proc();
}

module_init(crypto_algapi_init);
module_exit(crypto_algapi_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cryptographic algorithms API");