algapi.c 20.4 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
#include <linux/errno.h>
15
#include <linux/fips.h>
16 17
#include <linux/init.h>
#include <linux/kernel.h>
18
#include <linux/list.h>
19
#include <linux/module.h>
20
#include <linux/rtnetlink.h>
21
#include <linux/slab.h>
22 23 24 25
#include <linux/string.h>

#include "internal.h"

26 27
static LIST_HEAD(crypto_template_list);

28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
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;
}

45 46
static inline void crypto_check_module_sig(struct module *mod)
{
47
	if (fips_enabled && mod && !module_sig_ok(mod))
48
		panic("Module %s signature verification failed in FIPS mode\n",
49
		      module_name(mod));
50 51
}

52
static int crypto_check_alg(struct crypto_alg *alg)
53
{
54 55
	crypto_check_module_sig(alg->cra_module);

56 57 58 59 60 61 62 63 64
	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;

65 66
	atomic_set(&alg->cra_refcnt, 1);

67 68 69
	return crypto_set_driver_name(alg);
}

Herbert Xu's avatar
Herbert Xu committed
70 71 72 73 74 75 76 77 78
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);
}

79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101
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;
}

102 103
static void crypto_remove_instance(struct crypto_instance *inst,
				   struct list_head *list)
Herbert Xu's avatar
Herbert Xu committed
104
{
105
	struct crypto_template *tmpl = inst->tmpl;
Herbert Xu's avatar
Herbert Xu committed
106

107 108
	if (crypto_is_dead(&inst->alg))
		return;
Herbert Xu's avatar
Herbert Xu committed
109

110
	inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
111 112 113
	if (hlist_unhashed(&inst->list))
		return;

114 115 116 117 118 119 120 121
	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;

122
	BUG_ON(!list_empty(&inst->alg.cra_users));
123 124
}

125 126
void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
			  struct crypto_alg *nalg)
127
{
128
	u32 new_type = (nalg ?: alg)->cra_flags;
129 130
	struct crypto_spawn *spawn, *n;
	LIST_HEAD(secondary_spawns);
131 132 133
	struct list_head *spawns;
	LIST_HEAD(stack);
	LIST_HEAD(top);
Herbert Xu's avatar
Herbert Xu committed
134

135
	spawns = &alg->cra_users;
136 137
	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
138 139
			continue;

140
		list_move(&spawn->list, &top);
141
	}
Herbert Xu's avatar
Herbert Xu committed
142

143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
	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
169
			crypto_remove_instance(spawn->inst, list);
Herbert Xu's avatar
Herbert Xu committed
170 171
	}
}
172
EXPORT_SYMBOL_GPL(crypto_remove_spawns);
Herbert Xu's avatar
Herbert Xu committed
173

174
static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
175 176
{
	struct crypto_alg *q;
177
	struct crypto_larval *larval;
Herbert Xu's avatar
Herbert Xu committed
178 179 180
	int ret = -EAGAIN;

	if (crypto_is_dead(alg))
181
		goto err;
Herbert Xu's avatar
Herbert Xu committed
182 183 184

	INIT_LIST_HEAD(&alg->cra_users);

185 186 187
	/* No cheating! */
	alg->cra_flags &= ~CRYPTO_ALG_TESTED;

Herbert Xu's avatar
Herbert Xu committed
188
	ret = -EEXIST;
189

190
	list_for_each_entry(q, &crypto_alg_list, cra_list) {
191
		if (q == alg)
192 193
			goto err;

194 195 196
		if (crypto_is_moribund(q))
			continue;

197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225
		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);

226
out:
227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244
	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) {
245
		if (crypto_is_moribund(q) || !crypto_is_larval(q))
246 247 248 249 250 251 252 253 254 255 256 257
			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:
258
	q->cra_flags |= CRYPTO_ALG_DEAD;
259 260 261 262 263 264 265 266 267
	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
268 269 270 271 272

		if (crypto_is_moribund(q))
			continue;

		if (crypto_is_larval(q)) {
273 274
			struct crypto_larval *larval = (void *)q;

275 276 277 278 279
			/*
			 * 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
280 281 282 283 284 285
			if (strcmp(alg->cra_name, q->cra_name) &&
			    strcmp(alg->cra_driver_name, q->cra_name))
				continue;

			if (larval->adult)
				continue;
286 287
			if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
				continue;
288 289
			if (!crypto_mod_get(alg))
				continue;
Herbert Xu's avatar
Herbert Xu committed
290

291
			larval->adult = alg;
Herbert Xu's avatar
Herbert Xu committed
292
			continue;
293
		}
Herbert Xu's avatar
Herbert Xu committed
294 295 296 297 298 299 300 301

		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;

302
		crypto_remove_spawns(q, &list, alg);
303
	}
304

305 306
complete:
	complete_all(&test->completion);
307

308 309 310 311
unlock:
	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);
312
}
313
EXPORT_SYMBOL_GPL(crypto_alg_tested);
314

315
void crypto_remove_final(struct list_head *list)
Herbert Xu's avatar
Herbert Xu committed
316 317 318 319 320 321 322 323 324
{
	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);
	}
}
325
EXPORT_SYMBOL_GPL(crypto_remove_final);
Herbert Xu's avatar
Herbert Xu committed
326

327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344
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);
}

345 346
int crypto_register_alg(struct crypto_alg *alg)
{
347
	struct crypto_larval *larval;
348 349 350 351 352 353 354
	int err;

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

	down_write(&crypto_alg_sem);
355
	larval = __crypto_register_alg(alg);
356 357
	up_write(&crypto_alg_sem);

358 359 360 361 362
	if (IS_ERR(larval))
		return PTR_ERR(larval);

	crypto_wait_for_test(larval);
	return 0;
363
}
364 365
EXPORT_SYMBOL_GPL(crypto_register_alg);

Herbert Xu's avatar
Herbert Xu committed
366 367 368 369 370 371 372 373 374
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);
375
	crypto_remove_spawns(alg, list, NULL);
Herbert Xu's avatar
Herbert Xu committed
376 377 378 379

	return 0;
}

380 381
int crypto_unregister_alg(struct crypto_alg *alg)
{
Herbert Xu's avatar
Herbert Xu committed
382 383
	int ret;
	LIST_HEAD(list);
384

385
	down_write(&crypto_alg_sem);
Herbert Xu's avatar
Herbert Xu committed
386
	ret = crypto_remove_alg(alg, &list);
387 388 389 390 391 392 393 394 395
	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
396
	crypto_remove_final(&list);
397 398 399 400
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_alg);

401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435
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);

436 437 438 439 440 441 442
int crypto_register_template(struct crypto_template *tmpl)
{
	struct crypto_template *q;
	int err = -EEXIST;

	down_write(&crypto_alg_sem);

443 444
	crypto_check_module_sig(tmpl->module);

445 446 447 448 449 450
	list_for_each_entry(q, &crypto_template_list, list) {
		if (q == tmpl)
			goto out;
	}

	list_add(&tmpl->list, &crypto_template_list);
451
	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
452 453 454 455 456 457 458 459 460 461
	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;
462
	struct hlist_node *n;
463
	struct hlist_head *list;
Herbert Xu's avatar
Herbert Xu committed
464
	LIST_HEAD(users);
465 466 467 468 469 470 471

	down_write(&crypto_alg_sem);

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

	list = &tmpl->instances;
472
	hlist_for_each_entry(inst, list, list) {
Herbert Xu's avatar
Herbert Xu committed
473
		int err = crypto_remove_alg(&inst->alg, &users);
474

Herbert Xu's avatar
Herbert Xu committed
475
		BUG_ON(err);
476 477
	}

478 479
	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);

480 481
	up_write(&crypto_alg_sem);

482
	hlist_for_each_entry_safe(inst, n, list, list) {
483 484 485
		BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
		tmpl->free(inst);
	}
Herbert Xu's avatar
Herbert Xu committed
486
	crypto_remove_final(&users);
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510
}
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)
{
511 512
	return try_then_request_module(__crypto_lookup_template(name),
				       "crypto-%s", name);
513 514 515 516 517 518
}
EXPORT_SYMBOL_GPL(crypto_lookup_template);

int crypto_register_instance(struct crypto_template *tmpl,
			     struct crypto_instance *inst)
{
519 520
	struct crypto_larval *larval;
	int err;
521 522 523

	err = crypto_check_alg(&inst->alg);
	if (err)
524 525
		return err;

526
	inst->alg.cra_module = tmpl->module;
527
	inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
528

529 530 531
	if (unlikely(!crypto_mod_get(&inst->alg)))
		return -EAGAIN;

532 533
	down_write(&crypto_alg_sem);

534 535
	larval = __crypto_register_alg(&inst->alg);
	if (IS_ERR(larval))
536 537 538 539 540 541 542 543
		goto unlock;

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

unlock:
	up_write(&crypto_alg_sem);

544 545 546 547 548
	err = PTR_ERR(larval);
	if (IS_ERR(larval))
		goto err;

	crypto_wait_for_test(larval);
549 550 551 552

	/* Remove instance if test failed */
	if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
		crypto_unregister_instance(inst);
553
	err = 0;
Herbert Xu's avatar
Herbert Xu committed
554

555
err:
556
	crypto_mod_put(&inst->alg);
557 558 559
	return err;
}
EXPORT_SYMBOL_GPL(crypto_register_instance);
560

561
int crypto_unregister_instance(struct crypto_instance *inst)
562
{
563
	LIST_HEAD(list);
564 565 566

	down_write(&crypto_alg_sem);

567
	crypto_remove_spawns(&inst->alg, &list, NULL);
568
	crypto_remove_instance(inst, &list);
569 570 571

	up_write(&crypto_alg_sem);

572
	crypto_remove_final(&list);
573 574 575 576

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_instance);
577

Herbert Xu's avatar
Herbert Xu committed
578
int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
579
		      struct crypto_instance *inst, u32 mask)
Herbert Xu's avatar
Herbert Xu committed
580 581 582 583
{
	int err = -EAGAIN;

	spawn->inst = inst;
584
	spawn->mask = mask;
Herbert Xu's avatar
Herbert Xu committed
585 586 587 588 589 590 591 592 593 594 595 596 597

	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);

598 599 600 601 602 603
int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
		       struct crypto_instance *inst,
		       const struct crypto_type *frontend)
{
	int err = -EINVAL;

604
	if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
605 606 607 608 609 610 611 612 613 614
		goto out;

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

out:
	return err;
}
EXPORT_SYMBOL_GPL(crypto_init_spawn2);

615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
		      u32 type, u32 mask)
{
	struct crypto_alg *alg;
	int err;

	alg = crypto_find_alg(name, spawn->frontend, type, mask);
	if (IS_ERR(alg))
		return PTR_ERR(alg);

	err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
	crypto_mod_put(alg);
	return err;
}
EXPORT_SYMBOL_GPL(crypto_grab_spawn);

Herbert Xu's avatar
Herbert Xu committed
631 632
void crypto_drop_spawn(struct crypto_spawn *spawn)
{
633 634 635
	if (!spawn->alg)
		return;

Herbert Xu's avatar
Herbert Xu committed
636 637 638 639 640 641
	down_write(&crypto_alg_sem);
	list_del(&spawn->list);
	up_write(&crypto_alg_sem);
}
EXPORT_SYMBOL_GPL(crypto_drop_spawn);

642
static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
Herbert Xu's avatar
Herbert Xu committed
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659
{
	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);
	}

660 661 662 663 664 665 666 667 668 669 670 671 672
	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);

673 674 675 676
	tfm = ERR_PTR(-EINVAL);
	if (unlikely((alg->cra_flags ^ type) & mask))
		goto out_put_alg;

677
	tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu's avatar
Herbert Xu committed
678
	if (IS_ERR(tfm))
679 680 681
		goto out_put_alg;

	return tfm;
Herbert Xu's avatar
Herbert Xu committed
682

683 684
out_put_alg:
	crypto_mod_put(alg);
Herbert Xu's avatar
Herbert Xu committed
685 686 687 688
	return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm);

689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
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);

710 711 712 713 714 715 716 717 718 719 720 721
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);

722
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
723
{
724
	struct rtattr *rta = tb[0];
725 726 727 728 729 730
	struct crypto_attr_type *algt;

	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*algt))
		return ERR_PTR(-EINVAL);
731 732
	if (rta->rta_type != CRYPTOA_TYPE)
		return ERR_PTR(-EINVAL);
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754

	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);

755
const char *crypto_attr_alg_name(struct rtattr *rta)
756
{
757 758
	struct crypto_attr_alg *alga;

759 760 761
	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*alga))
762
		return ERR_PTR(-EINVAL);
763 764
	if (rta->rta_type != CRYPTOA_ALG)
		return ERR_PTR(-EINVAL);
765 766 767 768

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

769 770 771 772
	return alga->name;
}
EXPORT_SYMBOL_GPL(crypto_attr_alg_name);

773 774 775
struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
				    const struct crypto_type *frontend,
				    u32 type, u32 mask)
776 777 778 779 780
{
	const char *name;

	name = crypto_attr_alg_name(rta);
	if (IS_ERR(name))
Julia Lawall's avatar
Julia Lawall committed
781
		return ERR_CAST(name);
782

783
	return crypto_find_alg(name, frontend, type, mask);
784
}
785
EXPORT_SYMBOL_GPL(crypto_attr_alg2);
Herbert Xu's avatar
Herbert Xu committed
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803

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);
804

805 806
void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
			     unsigned int head)
807 808
{
	struct crypto_instance *inst;
809
	char *p;
810 811
	int err;

812 813 814
	p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
		    GFP_KERNEL);
	if (!p)
815 816
		return ERR_PTR(-ENOMEM);

817 818
	inst = (void *)(p + head);

819 820 821 822 823 824 825 826 827
	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;

828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
	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;

847
	spawn = crypto_instance_ctx(inst);
848 849
	err = crypto_init_spawn(spawn, alg, inst,
				CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
850 851 852 853 854 855 856 857

	if (err)
		goto err_free_inst;

	return inst;

err_free_inst:
	kfree(inst);
858 859 860 861
	inst = ERR_PTR(err);

out:
	return inst;
862 863 864
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance);

865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
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);

895
struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
896 897 898 899 900 901 902 903 904 905 906 907 908 909
{
	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);

910
	return list_entry(request, struct crypto_async_request, list);
911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926
}
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);

927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
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);

974 975
unsigned int crypto_alg_extsize(struct crypto_alg *alg)
{
976 977
	return alg->cra_ctxsize +
	       (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
978 979 980
}
EXPORT_SYMBOL_GPL(crypto_alg_extsize);

981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996
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");