algapi.c 19.8 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
static int crypto_check_alg(struct crypto_alg *alg)
45 46 47 48 49 50 51 52 53 54
{
	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;

55 56 57
	return crypto_set_driver_name(alg);
}

Herbert Xu's avatar
Herbert Xu committed
58 59 60 61 62 63 64 65 66
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);
}

67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
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;
}

90
static void crypto_remove_spawn(struct crypto_spawn *spawn,
91
				struct list_head *list)
Herbert Xu's avatar
Herbert Xu committed
92
{
93 94
	struct crypto_instance *inst = spawn->inst;
	struct crypto_template *tmpl = inst->tmpl;
Herbert Xu's avatar
Herbert Xu committed
95

96 97
	if (crypto_is_dead(&inst->alg))
		return;
Herbert Xu's avatar
Herbert Xu committed
98

99
	inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
100 101 102
	if (hlist_unhashed(&inst->list))
		return;

103 104 105 106 107 108 109 110
	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;

111
	BUG_ON(!list_empty(&inst->alg.cra_users));
112 113
}

114 115
void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
			  struct crypto_alg *nalg)
116
{
117
	u32 new_type = (nalg ?: alg)->cra_flags;
118 119
	struct crypto_spawn *spawn, *n;
	LIST_HEAD(secondary_spawns);
120 121 122
	struct list_head *spawns;
	LIST_HEAD(stack);
	LIST_HEAD(top);
Herbert Xu's avatar
Herbert Xu committed
123

124
	spawns = &alg->cra_users;
125 126
	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
127 128
			continue;

129
		list_move(&spawn->list, &top);
130
	}
Herbert Xu's avatar
Herbert Xu committed
131

132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
	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
			crypto_remove_spawn(spawn, list);
Herbert Xu's avatar
Herbert Xu committed
159 160
	}
}
161
EXPORT_SYMBOL_GPL(crypto_remove_spawns);
Herbert Xu's avatar
Herbert Xu committed
162

163
static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
164 165
{
	struct crypto_alg *q;
166
	struct crypto_larval *larval;
Herbert Xu's avatar
Herbert Xu committed
167 168 169
	int ret = -EAGAIN;

	if (crypto_is_dead(alg))
170
		goto err;
Herbert Xu's avatar
Herbert Xu committed
171 172 173

	INIT_LIST_HEAD(&alg->cra_users);

174 175 176
	/* No cheating! */
	alg->cra_flags &= ~CRYPTO_ALG_TESTED;

Herbert Xu's avatar
Herbert Xu committed
177
	ret = -EEXIST;
178

179
	atomic_set(&alg->cra_refcnt, 1);
180
	list_for_each_entry(q, &crypto_alg_list, cra_list) {
181
		if (q == alg)
182 183
			goto err;

184 185 186
		if (crypto_is_moribund(q))
			continue;

187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
		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);

216
out:
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234
	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) {
235
		if (crypto_is_moribund(q) || !crypto_is_larval(q))
236 237 238 239 240 241 242 243 244 245 246 247
			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:
248
	q->cra_flags |= CRYPTO_ALG_DEAD;
249 250 251 252 253 254 255 256 257
	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
258 259 260 261 262

		if (crypto_is_moribund(q))
			continue;

		if (crypto_is_larval(q)) {
263 264
			struct crypto_larval *larval = (void *)q;

265 266 267 268 269
			/*
			 * 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
270 271 272 273 274 275
			if (strcmp(alg->cra_name, q->cra_name) &&
			    strcmp(alg->cra_driver_name, q->cra_name))
				continue;

			if (larval->adult)
				continue;
276 277
			if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
				continue;
278 279
			if (!crypto_mod_get(alg))
				continue;
Herbert Xu's avatar
Herbert Xu committed
280

281
			larval->adult = alg;
Herbert Xu's avatar
Herbert Xu committed
282
			continue;
283
		}
Herbert Xu's avatar
Herbert Xu committed
284 285 286 287 288 289 290 291

		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;

292
		crypto_remove_spawns(q, &list, alg);
293
	}
294

295 296
complete:
	complete_all(&test->completion);
297

298 299 300 301
unlock:
	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);
302
}
303
EXPORT_SYMBOL_GPL(crypto_alg_tested);
304

305
void crypto_remove_final(struct list_head *list)
Herbert Xu's avatar
Herbert Xu committed
306 307 308 309 310 311 312 313 314
{
	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);
	}
}
315
EXPORT_SYMBOL_GPL(crypto_remove_final);
Herbert Xu's avatar
Herbert Xu committed
316

317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
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);
}

335 336
int crypto_register_alg(struct crypto_alg *alg)
{
337
	struct crypto_larval *larval;
338 339 340 341 342 343 344
	int err;

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

	down_write(&crypto_alg_sem);
345
	larval = __crypto_register_alg(alg);
346 347
	up_write(&crypto_alg_sem);

348 349 350 351 352
	if (IS_ERR(larval))
		return PTR_ERR(larval);

	crypto_wait_for_test(larval);
	return 0;
353
}
354 355
EXPORT_SYMBOL_GPL(crypto_register_alg);

Herbert Xu's avatar
Herbert Xu committed
356 357 358 359 360 361 362 363 364
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);
365
	crypto_remove_spawns(alg, list, NULL);
Herbert Xu's avatar
Herbert Xu committed
366 367 368 369

	return 0;
}

370 371
int crypto_unregister_alg(struct crypto_alg *alg)
{
Herbert Xu's avatar
Herbert Xu committed
372 373
	int ret;
	LIST_HEAD(list);
374

375
	down_write(&crypto_alg_sem);
Herbert Xu's avatar
Herbert Xu committed
376
	ret = crypto_remove_alg(alg, &list);
377 378 379 380 381 382 383 384 385
	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
386
	crypto_remove_final(&list);
387 388 389 390
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_alg);

391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425
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);

426 427 428 429 430 431 432 433 434 435 436 437 438
int crypto_register_template(struct crypto_template *tmpl)
{
	struct crypto_template *q;
	int err = -EEXIST;

	down_write(&crypto_alg_sem);

	list_for_each_entry(q, &crypto_template_list, list) {
		if (q == tmpl)
			goto out;
	}

	list_add(&tmpl->list, &crypto_template_list);
439
	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
440 441 442 443 444 445 446 447 448 449
	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;
450
	struct hlist_node *n;
451
	struct hlist_head *list;
Herbert Xu's avatar
Herbert Xu committed
452
	LIST_HEAD(users);
453 454 455 456 457 458 459

	down_write(&crypto_alg_sem);

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

	list = &tmpl->instances;
460
	hlist_for_each_entry(inst, list, list) {
Herbert Xu's avatar
Herbert Xu committed
461 462
		int err = crypto_remove_alg(&inst->alg, &users);
		BUG_ON(err);
463 464
	}

465 466
	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);

467 468
	up_write(&crypto_alg_sem);

469
	hlist_for_each_entry_safe(inst, n, list, list) {
470 471 472
		BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
		tmpl->free(inst);
	}
Herbert Xu's avatar
Herbert Xu committed
473
	crypto_remove_final(&users);
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
}
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)
{
498 499
	return try_then_request_module(__crypto_lookup_template(name), "%s",
				       name);
500 501 502 503 504 505
}
EXPORT_SYMBOL_GPL(crypto_lookup_template);

int crypto_register_instance(struct crypto_template *tmpl,
			     struct crypto_instance *inst)
{
506 507
	struct crypto_larval *larval;
	int err;
508 509 510 511 512 513

	err = crypto_check_alg(&inst->alg);
	if (err)
		goto err;

	inst->alg.cra_module = tmpl->module;
514
	inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
515 516 517

	down_write(&crypto_alg_sem);

518 519
	larval = __crypto_register_alg(&inst->alg);
	if (IS_ERR(larval))
520 521 522 523 524 525 526 527
		goto unlock;

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

unlock:
	up_write(&crypto_alg_sem);

528 529 530 531 532 533
	err = PTR_ERR(larval);
	if (IS_ERR(larval))
		goto err;

	crypto_wait_for_test(larval);
	err = 0;
Herbert Xu's avatar
Herbert Xu committed
534

535 536 537 538
err:
	return err;
}
EXPORT_SYMBOL_GPL(crypto_register_instance);
539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567

int crypto_unregister_instance(struct crypto_alg *alg)
{
	int err;
	struct crypto_instance *inst = (void *)alg;
	struct crypto_template *tmpl = inst->tmpl;
	LIST_HEAD(users);

	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
		return -EINVAL;

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

	down_write(&crypto_alg_sem);

	hlist_del_init(&inst->list);
	err = crypto_remove_alg(alg, &users);

	up_write(&crypto_alg_sem);

	if (err)
		return err;

	tmpl->free(inst);
	crypto_remove_final(&users);

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_instance);
568

Herbert Xu's avatar
Herbert Xu committed
569
int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
570
		      struct crypto_instance *inst, u32 mask)
Herbert Xu's avatar
Herbert Xu committed
571 572 573 574
{
	int err = -EAGAIN;

	spawn->inst = inst;
575
	spawn->mask = mask;
Herbert Xu's avatar
Herbert Xu committed
576 577 578 579 580 581 582 583 584 585 586 587 588

	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);

589 590 591 592 593 594
int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
		       struct crypto_instance *inst,
		       const struct crypto_type *frontend)
{
	int err = -EINVAL;

595
	if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
596 597 598 599 600 601 602 603 604 605
		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
606 607
void crypto_drop_spawn(struct crypto_spawn *spawn)
{
608 609 610
	if (!spawn->alg)
		return;

Herbert Xu's avatar
Herbert Xu committed
611 612 613 614 615 616
	down_write(&crypto_alg_sem);
	list_del(&spawn->list);
	up_write(&crypto_alg_sem);
}
EXPORT_SYMBOL_GPL(crypto_drop_spawn);

617
static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
Herbert Xu's avatar
Herbert Xu committed
618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634
{
	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);
	}

635 636 637 638 639 640 641 642 643 644 645 646 647
	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);

648 649 650 651
	tfm = ERR_PTR(-EINVAL);
	if (unlikely((alg->cra_flags ^ type) & mask))
		goto out_put_alg;

652
	tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu's avatar
Herbert Xu committed
653
	if (IS_ERR(tfm))
654 655 656
		goto out_put_alg;

	return tfm;
Herbert Xu's avatar
Herbert Xu committed
657

658 659
out_put_alg:
	crypto_mod_put(alg);
Herbert Xu's avatar
Herbert Xu committed
660 661 662 663
	return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm);

664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684
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);

685 686 687 688 689 690 691 692 693 694 695 696
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);

697
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
698
{
699
	struct rtattr *rta = tb[0];
700 701 702 703 704 705
	struct crypto_attr_type *algt;

	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*algt))
		return ERR_PTR(-EINVAL);
706 707
	if (rta->rta_type != CRYPTOA_TYPE)
		return ERR_PTR(-EINVAL);
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729

	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);

730
const char *crypto_attr_alg_name(struct rtattr *rta)
731
{
732 733
	struct crypto_attr_alg *alga;

734 735 736
	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*alga))
737
		return ERR_PTR(-EINVAL);
738 739
	if (rta->rta_type != CRYPTOA_ALG)
		return ERR_PTR(-EINVAL);
740 741 742 743

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

744 745 746 747
	return alga->name;
}
EXPORT_SYMBOL_GPL(crypto_attr_alg_name);

748 749 750
struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
				    const struct crypto_type *frontend,
				    u32 type, u32 mask)
751 752 753 754 755
{
	const char *name;

	name = crypto_attr_alg_name(rta);
	if (IS_ERR(name))
Julia Lawall's avatar
Julia Lawall committed
756
		return ERR_CAST(name);
757

758
	return crypto_find_alg(name, frontend, type, mask);
759
}
760
EXPORT_SYMBOL_GPL(crypto_attr_alg2);
Herbert Xu's avatar
Herbert Xu committed
761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778

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);
779

780 781
void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
			     unsigned int head)
782 783
{
	struct crypto_instance *inst;
784
	char *p;
785 786
	int err;

787 788 789
	p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
		    GFP_KERNEL);
	if (!p)
790 791
		return ERR_PTR(-ENOMEM);

792 793
	inst = (void *)(p + head);

794 795 796 797 798 799 800 801 802
	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;

803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
	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;

822
	spawn = crypto_instance_ctx(inst);
823 824
	err = crypto_init_spawn(spawn, alg, inst,
				CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
825 826 827 828 829 830 831 832

	if (err)
		goto err_free_inst;

	return inst;

err_free_inst:
	kfree(inst);
833 834 835 836
	inst = ERR_PTR(err);

out:
	return inst;
837 838 839
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance);

840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
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);

870
void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
871 872 873 874 875 876 877 878 879 880 881 882 883 884
{
	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);

885 886 887 888 889 890 891 892
	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);
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
}
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);

909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955
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);

956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
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");