crypto/algapi.c

   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
  13 #include <linux/err.h>
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #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 #include <linux/string.h>
  22
  23 #include "internal.h"
  24
  25 static LIST_HEAD(crypto_template_list);
  26
  27 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  28 {
  29         static const char suffix[] = "-generic";
  30         char *driver_name = alg->cra_driver_name;
  31         int len;
  32
  33         if (*driver_name)
  34                 return 0;
  35
  36         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  37         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  38                 return -ENAMETOOLONG;
  39
  40         memcpy(driver_name + len, suffix, sizeof(suffix));
  41         return 0;
  42 }
  43
  44 static inline void crypto_check_module_sig(struct module *mod)
  45 {
  46         if (fips_enabled && mod && !module_sig_ok(mod))
  47                 panic("Module %s signature verification failed in FIPS mode\n",
  48                       mod->name);
  49 }
  50
  51 static int crypto_check_alg(struct crypto_alg *alg)
  52 {
  53         crypto_check_module_sig(alg->cra_module);
  54
  55         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  56                 return -EINVAL;
  57
  58         if (alg->cra_blocksize > PAGE_SIZE / 8)
  59                 return -EINVAL;
  60
  61         if (alg->cra_priority < 0)
  62                 return -EINVAL;
  63
  64         atomic_set(&alg->cra_refcnt, 1);
  65
  66         return crypto_set_driver_name(alg);
  67 }
  68
  69 static void crypto_destroy_instance(struct crypto_alg *alg)
  70 {
  71         struct crypto_instance *inst = (void *)alg;
  72         struct crypto_template *tmpl = inst->tmpl;
  73
  74         tmpl->free(inst);
  75         crypto_tmpl_put(tmpl);
  76 }
  77
  78 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  79                                             struct list_head *stack,
  80                                             struct list_head *top,
  81                                             struct list_head *secondary_spawns)
  82 {
  83         struct crypto_spawn *spawn, *n;
  84
  85         if (list_empty(stack))
  86                 return NULL;
  87
  88         spawn = list_first_entry(stack, struct crypto_spawn, list);
  89         n = list_entry(spawn->list.next, struct crypto_spawn, list);
  90
  91         if (spawn->alg && &n->list != stack && !n->alg)
  92                 n->alg = (n->list.next == stack) ? alg :
  93                          &list_entry(n->list.next, struct crypto_spawn,
  94                                      list)->inst->alg;
  95
  96         list_move(&spawn->list, secondary_spawns);
  97
  98         return &n->list == stack ? top : &n->inst->alg.cra_users;
  99 }
 100
 101 static void crypto_remove_instance(struct crypto_instance *inst,
 102                                    struct list_head *list)
 103 {
 104         struct crypto_template *tmpl = inst->tmpl;
 105
 106         if (crypto_is_dead(&inst->alg))
 107                 return;
 108
 109         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 110         if (hlist_unhashed(&inst->list))
 111                 return;
 112
 113         if (!tmpl || !crypto_tmpl_get(tmpl))
 114                 return;
 115
 116         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 117         list_move(&inst->alg.cra_list, list);
 118         hlist_del(&inst->list);
 119         inst->alg.cra_destroy = crypto_destroy_instance;
 120
 121         BUG_ON(!list_empty(&inst->alg.cra_users));
 122 }
 123
 124 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 125                           struct crypto_alg *nalg)
 126 {
 127         u32 new_type = (nalg ?: alg)->cra_flags;
 128         struct crypto_spawn *spawn, *n;
 129         LIST_HEAD(secondary_spawns);
 130         struct list_head *spawns;
 131         LIST_HEAD(stack);
 132         LIST_HEAD(top);
 133
 134         spawns = &alg->cra_users;
 135         list_for_each_entry_safe(spawn, n, spawns, list) {
 136                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 137                         continue;
 138
 139                 list_move(&spawn->list, &top);
 140         }
 141
 142         spawns = &top;
 143         do {
 144                 while (!list_empty(spawns)) {
 145                         struct crypto_instance *inst;
 146
 147                         spawn = list_first_entry(spawns, struct crypto_spawn,
 148                                                  list);
 149                         inst = spawn->inst;
 150
 151                         BUG_ON(&inst->alg == alg);
 152
 153                         list_move(&spawn->list, &stack);
 154
 155                         if (&inst->alg == nalg)
 156                                 break;
 157
 158                         spawn->alg = NULL;
 159                         spawns = &inst->alg.cra_users;
 160                 }
 161         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 162                                               &secondary_spawns)));
 163
 164         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 165                 if (spawn->alg)
 166                         list_move(&spawn->list, &spawn->alg->cra_users);
 167                 else
 168                         crypto_remove_instance(spawn->inst, list);
 169         }
 170 }
 171 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 172
 173 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 174 {
 175         struct crypto_alg *q;
 176         struct crypto_larval *larval;
 177         int ret = -EAGAIN;
 178
 179         if (crypto_is_dead(alg))
 180                 goto err;
 181
 182         INIT_LIST_HEAD(&alg->cra_users);
 183
 184         /* No cheating! */
 185         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 186
 187         ret = -EEXIST;
 188
 189         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 190                 if (q == alg)
 191                         goto err;
 192
 193                 if (crypto_is_moribund(q))
 194                         continue;
 195
 196                 if (crypto_is_larval(q)) {
 197                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 198                                 goto err;
 199                         continue;
 200                 }
 201
 202                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 203                     !strcmp(q->cra_name, alg->cra_driver_name))
 204                         goto err;
 205         }
 206
 207         larval = crypto_larval_alloc(alg->cra_name,
 208                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 209         if (IS_ERR(larval))
 210                 goto out;
 211
 212         ret = -ENOENT;
 213         larval->adult = crypto_mod_get(alg);
 214         if (!larval->adult)
 215                 goto free_larval;
 216
 217         atomic_set(&larval->alg.cra_refcnt, 1);
 218         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 219                CRYPTO_MAX_ALG_NAME);
 220         larval->alg.cra_priority = alg->cra_priority;
 221
 222         list_add(&alg->cra_list, &crypto_alg_list);
 223         list_add(&larval->alg.cra_list, &crypto_alg_list);
 224
 225 out:
 226         return larval;
 227
 228 free_larval:
 229         kfree(larval);
 230 err:
 231         larval = ERR_PTR(ret);
 232         goto out;
 233 }
 234
 235 void crypto_alg_tested(const char *name, int err)
 236 {
 237         struct crypto_larval *test;
 238         struct crypto_alg *alg;
 239         struct crypto_alg *q;
 240         LIST_HEAD(list);
 241
 242         down_write(&crypto_alg_sem);
 243         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 244                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 245                         continue;
 246
 247                 test = (struct crypto_larval *)q;
 248
 249                 if (!strcmp(q->cra_driver_name, name))
 250                         goto found;
 251         }
 252
 253         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 254         goto unlock;
 255
 256 found:
 257         q->cra_flags |= CRYPTO_ALG_DEAD;
 258         alg = test->adult;
 259         if (err || list_empty(&alg->cra_list))
 260                 goto complete;
 261
 262         alg->cra_flags |= CRYPTO_ALG_TESTED;
 263
 264         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 265                 if (q == alg)
 266                         continue;
 267
 268                 if (crypto_is_moribund(q))
 269                         continue;
 270
 271                 if (crypto_is_larval(q)) {
 272                         struct crypto_larval *larval = (void *)q;
 273
 274                         /*
 275                          * Check to see if either our generic name or
 276                          * specific name can satisfy the name requested
 277                          * by the larval entry q.
 278                          */
 279                         if (strcmp(alg->cra_name, q->cra_name) &&
 280                             strcmp(alg->cra_driver_name, q->cra_name))
 281                                 continue;
 282
 283                         if (larval->adult)
 284                                 continue;
 285                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 286                                 continue;
 287                         if (!crypto_mod_get(alg))
 288                                 continue;
 289
 290                         larval->adult = alg;
 291                         continue;
 292                 }
 293
 294                 if (strcmp(alg->cra_name, q->cra_name))
 295                         continue;
 296
 297                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 298                     q->cra_priority > alg->cra_priority)
 299                         continue;
 300
 301                 crypto_remove_spawns(q, &list, alg);
 302         }
 303
 304 complete:
 305         complete_all(&test->completion);
 306
 307 unlock:
 308         up_write(&crypto_alg_sem);
 309
 310         crypto_remove_final(&list);
 311 }
 312 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 313
 314 void crypto_remove_final(struct list_head *list)
 315 {
 316         struct crypto_alg *alg;
 317         struct crypto_alg *n;
 318
 319         list_for_each_entry_safe(alg, n, list, cra_list) {
 320                 list_del_init(&alg->cra_list);
 321                 crypto_alg_put(alg);
 322         }
 323 }
 324 EXPORT_SYMBOL_GPL(crypto_remove_final);
 325
 326 static void crypto_wait_for_test(struct crypto_larval *larval)
 327 {
 328         int err;
 329
 330         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 331         if (err != NOTIFY_STOP) {
 332                 if (WARN_ON(err != NOTIFY_DONE))
 333                         goto out;
 334                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 335         }
 336
 337         err = wait_for_completion_interruptible(&larval->completion);
 338         WARN_ON(err);
 339
 340 out:
 341         crypto_larval_kill(&larval->alg);
 342 }
 343
 344 int crypto_register_alg(struct crypto_alg *alg)
 345 {
 346         struct crypto_larval *larval;
 347         int err;
 348
 349         err = crypto_check_alg(alg);
 350         if (err)
 351                 return err;
 352
 353         down_write(&crypto_alg_sem);
 354         larval = __crypto_register_alg(alg);
 355         up_write(&crypto_alg_sem);
 356
 357         if (IS_ERR(larval))
 358                 return PTR_ERR(larval);
 359
 360         crypto_wait_for_test(larval);
 361         return 0;
 362 }
 363 EXPORT_SYMBOL_GPL(crypto_register_alg);
 364
 365 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 366 {
 367         if (unlikely(list_empty(&alg->cra_list)))
 368                 return -ENOENT;
 369
 370         alg->cra_flags |= CRYPTO_ALG_DEAD;
 371
 372         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 373         list_del_init(&alg->cra_list);
 374         crypto_remove_spawns(alg, list, NULL);
 375
 376         return 0;
 377 }
 378
 379 int crypto_unregister_alg(struct crypto_alg *alg)
 380 {
 381         int ret;
 382         LIST_HEAD(list);
 383
 384         down_write(&crypto_alg_sem);
 385         ret = crypto_remove_alg(alg, &list);
 386         up_write(&crypto_alg_sem);
 387
 388         if (ret)
 389                 return ret;
 390
 391         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 392         if (alg->cra_destroy)
 393                 alg->cra_destroy(alg);
 394
 395         crypto_remove_final(&list);
 396         return 0;
 397 }
 398 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 399
 400 int crypto_register_algs(struct crypto_alg *algs, int count)
 401 {
 402         int i, ret;
 403
 404         for (i = 0; i < count; i++) {
 405                 ret = crypto_register_alg(&algs[i]);
 406                 if (ret)
 407                         goto err;
 408         }
 409
 410         return 0;
 411
 412 err:
 413         for (--i; i >= 0; --i)
 414                 crypto_unregister_alg(&algs[i]);
 415
 416         return ret;
 417 }
 418 EXPORT_SYMBOL_GPL(crypto_register_algs);
 419
 420 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 421 {
 422         int i, ret;
 423
 424         for (i = 0; i < count; i++) {
 425                 ret = crypto_unregister_alg(&algs[i]);
 426                 if (ret)
 427                         pr_err("Failed to unregister %s %s: %d\n",
 428                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 429         }
 430
 431         return 0;
 432 }
 433 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 434
 435 int crypto_register_template(struct crypto_template *tmpl)
 436 {
 437         struct crypto_template *q;
 438         int err = -EEXIST;
 439
 440         down_write(&crypto_alg_sem);
 441
 442         crypto_check_module_sig(tmpl->module);
 443
 444         list_for_each_entry(q, &crypto_template_list, list) {
 445                 if (q == tmpl)
 446                         goto out;
 447         }
 448
 449         list_add(&tmpl->list, &crypto_template_list);
 450         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 451         err = 0;
 452 out:
 453         up_write(&crypto_alg_sem);
 454         return err;
 455 }
 456 EXPORT_SYMBOL_GPL(crypto_register_template);
 457
 458 void crypto_unregister_template(struct crypto_template *tmpl)
 459 {
 460         struct crypto_instance *inst;
 461         struct hlist_node *n;
 462         struct hlist_head *list;
 463         LIST_HEAD(users);
 464
 465         down_write(&crypto_alg_sem);
 466
 467         BUG_ON(list_empty(&tmpl->list));
 468         list_del_init(&tmpl->list);
 469
 470         list = &tmpl->instances;
 471         hlist_for_each_entry(inst, list, list) {
 472                 int err = crypto_remove_alg(&inst->alg, &users);
 473
 474                 BUG_ON(err);
 475         }
 476
 477         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 478
 479         up_write(&crypto_alg_sem);
 480
 481         hlist_for_each_entry_safe(inst, n, list, list) {
 482                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 483                 tmpl->free(inst);
 484         }
 485         crypto_remove_final(&users);
 486 }
 487 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 488
 489 static struct crypto_template *__crypto_lookup_template(const char *name)
 490 {
 491         struct crypto_template *q, *tmpl = NULL;
 492
 493         down_read(&crypto_alg_sem);
 494         list_for_each_entry(q, &crypto_template_list, list) {
 495                 if (strcmp(q->name, name))
 496                         continue;
 497                 if (unlikely(!crypto_tmpl_get(q)))
 498                         continue;
 499
 500                 tmpl = q;
 501                 break;
 502         }
 503         up_read(&crypto_alg_sem);
 504
 505         return tmpl;
 506 }
 507
 508 struct crypto_template *crypto_lookup_template(const char *name)
 509 {
 510         return try_then_request_module(__crypto_lookup_template(name),
 511                                        "crypto-%s", name);
 512 }
 513 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 514
 515 int crypto_register_instance(struct crypto_template *tmpl,
 516                              struct crypto_instance *inst)
 517 {
 518         struct crypto_larval *larval;
 519         int err;
 520
 521         err = crypto_check_alg(&inst->alg);
 522         if (err)
 523                 return err;
 524
 525         inst->alg.cra_module = tmpl->module;
 526         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 527
 528         if (unlikely(!crypto_mod_get(&inst->alg)))
 529                 return -EAGAIN;
 530
 531         down_write(&crypto_alg_sem);
 532
 533         larval = __crypto_register_alg(&inst->alg);
 534         if (IS_ERR(larval))
 535                 goto unlock;
 536
 537         hlist_add_head(&inst->list, &tmpl->instances);
 538         inst->tmpl = tmpl;
 539
 540 unlock:
 541         up_write(&crypto_alg_sem);
 542
 543         err = PTR_ERR(larval);
 544         if (IS_ERR(larval))
 545                 goto err;
 546
 547         crypto_wait_for_test(larval);
 548
 549         /* Remove instance if test failed */
 550         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 551                 crypto_unregister_instance(inst);
 552         err = 0;
 553
 554 err:
 555         crypto_mod_put(&inst->alg);
 556         return err;
 557 }
 558 EXPORT_SYMBOL_GPL(crypto_register_instance);
 559
 560 int crypto_unregister_instance(struct crypto_instance *inst)
 561 {
 562         LIST_HEAD(list);
 563
 564         down_write(&crypto_alg_sem);
 565
 566         crypto_remove_spawns(&inst->alg, &list, NULL);
 567         crypto_remove_instance(inst, &list);
 568
 569         up_write(&crypto_alg_sem);
 570
 571         crypto_remove_final(&list);
 572
 573         return 0;
 574 }
 575 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 576
 577 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 578                       struct crypto_instance *inst, u32 mask)
 579 {
 580         int err = -EAGAIN;
 581
 582         spawn->inst = inst;
 583         spawn->mask = mask;
 584
 585         down_write(&crypto_alg_sem);
 586         if (!crypto_is_moribund(alg)) {
 587                 list_add(&spawn->list, &alg->cra_users);
 588                 spawn->alg = alg;
 589                 err = 0;
 590         }
 591         up_write(&crypto_alg_sem);
 592
 593         return err;
 594 }
 595 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 596
 597 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 598                        struct crypto_instance *inst,
 599                        const struct crypto_type *frontend)
 600 {
 601         int err = -EINVAL;
 602
 603         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 604                 goto out;
 605
 606         spawn->frontend = frontend;
 607         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 608
 609 out:
 610         return err;
 611 }
 612 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 613
 614 void crypto_drop_spawn(struct crypto_spawn *spawn)
 615 {
 616         if (!spawn->alg)
 617                 return;
 618
 619         down_write(&crypto_alg_sem);
 620         list_del(&spawn->list);
 621         up_write(&crypto_alg_sem);
 622 }
 623 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 624
 625 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 626 {
 627         struct crypto_alg *alg;
 628         struct crypto_alg *alg2;
 629
 630         down_read(&crypto_alg_sem);
 631         alg = spawn->alg;
 632         alg2 = alg;
 633         if (alg2)
 634                 alg2 = crypto_mod_get(alg2);
 635         up_read(&crypto_alg_sem);
 636
 637         if (!alg2) {
 638                 if (alg)
 639                         crypto_shoot_alg(alg);
 640                 return ERR_PTR(-EAGAIN);
 641         }
 642
 643         return alg;
 644 }
 645
 646 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 647                                     u32 mask)
 648 {
 649         struct crypto_alg *alg;
 650         struct crypto_tfm *tfm;
 651
 652         alg = crypto_spawn_alg(spawn);
 653         if (IS_ERR(alg))
 654                 return ERR_CAST(alg);
 655
 656         tfm = ERR_PTR(-EINVAL);
 657         if (unlikely((alg->cra_flags ^ type) & mask))
 658                 goto out_put_alg;
 659
 660         tfm = __crypto_alloc_tfm(alg, type, mask);
 661         if (IS_ERR(tfm))
 662                 goto out_put_alg;
 663
 664         return tfm;
 665
 666 out_put_alg:
 667         crypto_mod_put(alg);
 668         return tfm;
 669 }
 670 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 671
 672 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 673 {
 674         struct crypto_alg *alg;
 675         struct crypto_tfm *tfm;
 676
 677         alg = crypto_spawn_alg(spawn);
 678         if (IS_ERR(alg))
 679                 return ERR_CAST(alg);
 680
 681         tfm = crypto_create_tfm(alg, spawn->frontend);
 682         if (IS_ERR(tfm))
 683                 goto out_put_alg;
 684
 685         return tfm;
 686
 687 out_put_alg:
 688         crypto_mod_put(alg);
 689         return tfm;
 690 }
 691 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 692
 693 int crypto_register_notifier(struct notifier_block *nb)
 694 {
 695         return blocking_notifier_chain_register(&crypto_chain, nb);
 696 }
 697 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 698
 699 int crypto_unregister_notifier(struct notifier_block *nb)
 700 {
 701         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 702 }
 703 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 704
 705 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 706 {
 707         struct rtattr *rta = tb[0];
 708         struct crypto_attr_type *algt;
 709
 710         if (!rta)
 711                 return ERR_PTR(-ENOENT);
 712         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 713                 return ERR_PTR(-EINVAL);
 714         if (rta->rta_type != CRYPTOA_TYPE)
 715                 return ERR_PTR(-EINVAL);
 716
 717         algt = RTA_DATA(rta);
 718
 719         return algt;
 720 }
 721 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 722
 723 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 724 {
 725         struct crypto_attr_type *algt;
 726
 727         algt = crypto_get_attr_type(tb);
 728         if (IS_ERR(algt))
 729                 return PTR_ERR(algt);
 730
 731         if ((algt->type ^ type) & algt->mask)
 732                 return -EINVAL;
 733
 734         return 0;
 735 }
 736 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 737
 738 const char *crypto_attr_alg_name(struct rtattr *rta)
 739 {
 740         struct crypto_attr_alg *alga;
 741
 742         if (!rta)
 743                 return ERR_PTR(-ENOENT);
 744         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 745                 return ERR_PTR(-EINVAL);
 746         if (rta->rta_type != CRYPTOA_ALG)
 747                 return ERR_PTR(-EINVAL);
 748
 749         alga = RTA_DATA(rta);
 750         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 751
 752         return alga->name;
 753 }
 754 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 755
 756 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 757                                     const struct crypto_type *frontend,
 758                                     u32 type, u32 mask)
 759 {
 760         const char *name;
 761
 762         name = crypto_attr_alg_name(rta);
 763         if (IS_ERR(name))
 764                 return ERR_CAST(name);
 765
 766         return crypto_find_alg(name, frontend, type, mask);
 767 }
 768 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 769
 770 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 771 {
 772         struct crypto_attr_u32 *nu32;
 773
 774         if (!rta)
 775                 return -ENOENT;
 776         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 777                 return -EINVAL;
 778         if (rta->rta_type != CRYPTOA_U32)
 779                 return -EINVAL;
 780
 781         nu32 = RTA_DATA(rta);
 782         *num = nu32->num;
 783
 784         return 0;
 785 }
 786 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 787
 788 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 789                              unsigned int head)
 790 {
 791         struct crypto_instance *inst;
 792         char *p;
 793         int err;
 794
 795         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 796                     GFP_KERNEL);
 797         if (!p)
 798                 return ERR_PTR(-ENOMEM);
 799
 800         inst = (void *)(p + head);
 801
 802         err = -ENAMETOOLONG;
 803         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 804                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 805                 goto err_free_inst;
 806
 807         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 808                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 809                 goto err_free_inst;
 810
 811         return p;
 812
 813 err_free_inst:
 814         kfree(p);
 815         return ERR_PTR(err);
 816 }
 817 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 818
 819 struct crypto_instance *crypto_alloc_instance(const char *name,
 820                                               struct crypto_alg *alg)
 821 {
 822         struct crypto_instance *inst;
 823         struct crypto_spawn *spawn;
 824         int err;
 825
 826         inst = crypto_alloc_instance2(name, alg, 0);
 827         if (IS_ERR(inst))
 828                 goto out;
 829
 830         spawn = crypto_instance_ctx(inst);
 831         err = crypto_init_spawn(spawn, alg, inst,
 832                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 833
 834         if (err)
 835                 goto err_free_inst;
 836
 837         return inst;
 838
 839 err_free_inst:
 840         kfree(inst);
 841         inst = ERR_PTR(err);
 842
 843 out:
 844         return inst;
 845 }
 846 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 847
 848 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 849 {
 850         INIT_LIST_HEAD(&queue->list);
 851         queue->backlog = &queue->list;
 852         queue->qlen = 0;
 853         queue->max_qlen = max_qlen;
 854 }
 855 EXPORT_SYMBOL_GPL(crypto_init_queue);
 856
 857 int crypto_enqueue_request(struct crypto_queue *queue,
 858                            struct crypto_async_request *request)
 859 {
 860         int err = -EINPROGRESS;
 861
 862         if (unlikely(queue->qlen >= queue->max_qlen)) {
 863                 err = -EBUSY;
 864                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 865                         goto out;
 866                 if (queue->backlog == &queue->list)
 867                         queue->backlog = &request->list;
 868         }
 869
 870         queue->qlen++;
 871         list_add_tail(&request->list, &queue->list);
 872
 873 out:
 874         return err;
 875 }
 876 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 877
 878 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 879 {
 880         struct list_head *request;
 881
 882         if (unlikely(!queue->qlen))
 883                 return NULL;
 884
 885         queue->qlen--;
 886
 887         if (queue->backlog != &queue->list)
 888                 queue->backlog = queue->backlog->next;
 889
 890         request = queue->list.next;
 891         list_del(request);
 892
 893         return (char *)list_entry(request, struct crypto_async_request, list) -
 894                offset;
 895 }
 896 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 897
 898 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 899 {
 900         return __crypto_dequeue_request(queue, 0);
 901 }
 902 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 903
 904 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 905 {
 906         struct crypto_async_request *req;
 907
 908         list_for_each_entry(req, &queue->list, list) {
 909                 if (req->tfm == tfm)
 910                         return 1;
 911         }
 912
 913         return 0;
 914 }
 915 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 916
 917 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 918 {
 919         u8 *b = (a + size);
 920         u8 c;
 921
 922         for (; size; size--) {
 923                 c = *--b + 1;
 924                 *b = c;
 925                 if (c)
 926                         break;
 927         }
 928 }
 929
 930 void crypto_inc(u8 *a, unsigned int size)
 931 {
 932         __be32 *b = (__be32 *)(a + size);
 933         u32 c;
 934
 935         for (; size >= 4; size -= 4) {
 936                 c = be32_to_cpu(*--b) + 1;
 937                 *b = cpu_to_be32(c);
 938                 if (c)
 939                         return;
 940         }
 941
 942         crypto_inc_byte(a, size);
 943 }
 944 EXPORT_SYMBOL_GPL(crypto_inc);
 945
 946 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 947 {
 948         for (; size; size--)
 949                 *a++ ^= *b++;
 950 }
 951
 952 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 953 {
 954         u32 *a = (u32 *)dst;
 955         u32 *b = (u32 *)src;
 956
 957         for (; size >= 4; size -= 4)
 958                 *a++ ^= *b++;
 959
 960         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 961 }
 962 EXPORT_SYMBOL_GPL(crypto_xor);
 963
 964 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 965 {
 966         return alg->cra_ctxsize;
 967 }
 968 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
 969
 970 static int __init crypto_algapi_init(void)
 971 {
 972         crypto_init_proc();
 973         return 0;
 974 }
 975
 976 static void __exit crypto_algapi_exit(void)
 977 {
 978         crypto_exit_proc();
 979 }
 980
 981 module_init(crypto_algapi_init);
 982 module_exit(crypto_algapi_exit);
 983
 984 MODULE_LICENSE("GPL");
 985 MODULE_DESCRIPTION("Cryptographic algorithms API");