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/fips.h>
  16 #include <linux/init.h>
  17 #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 #include <linux/string.h>
  23
  24 #include "internal.h"
  25
  26 static LIST_HEAD(crypto_template_list);
  27
  28 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  29 {
  30         static const char suffix[] = "-generic";
  31         char *driver_name = alg->cra_driver_name;
  32         int len;
  33
  34         if (*driver_name)
  35                 return 0;
  36
  37         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  38         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  39                 return -ENAMETOOLONG;
  40
  41         memcpy(driver_name + len, suffix, sizeof(suffix));
  42         return 0;
  43 }
  44
  45 static inline void crypto_check_module_sig(struct module *mod)
  46 {
  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         crypto_check_module_sig(alg->cra_module);
  55
  56         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  57                 return -EINVAL;
  58
  59         if (alg->cra_blocksize > PAGE_SIZE / 8)
  60                 return -EINVAL;
  61
  62         if (alg->cra_priority < 0)
  63                 return -EINVAL;
  64
  65         atomic_set(&alg->cra_refcnt, 1);
  66
  67         return crypto_set_driver_name(alg);
  68 }
  69
  70 static void crypto_free_instance(struct crypto_instance *inst)
  71 {
  72         if (!inst->alg.cra_type->free) {
  73                 inst->tmpl->free(inst);
  74                 return;
  75         }
  76
  77         inst->alg.cra_type->free(inst);
  78 }
  79
  80 static void crypto_destroy_instance(struct crypto_alg *alg)
  81 {
  82         struct crypto_instance *inst = (void *)alg;
  83         struct crypto_template *tmpl = inst->tmpl;
  84
  85         crypto_free_instance(inst);
  86         crypto_tmpl_put(tmpl);
  87 }
  88
  89 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  90                                             struct list_head *stack,
  91                                             struct list_head *top,
  92                                             struct list_head *secondary_spawns)
  93 {
  94         struct crypto_spawn *spawn, *n;
  95
  96         spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
  97         if (!spawn)
  98                 return NULL;
  99
 100         n = list_next_entry(spawn, list);
 101
 102         if (spawn->alg && &n->list != stack && !n->alg)
 103                 n->alg = (n->list.next == stack) ? alg :
 104                          &list_next_entry(n, list)->inst->alg;
 105
 106         list_move(&spawn->list, secondary_spawns);
 107
 108         return &n->list == stack ? top : &n->inst->alg.cra_users;
 109 }
 110
 111 static void crypto_remove_instance(struct crypto_instance *inst,
 112                                    struct list_head *list)
 113 {
 114         struct crypto_template *tmpl = inst->tmpl;
 115
 116         if (crypto_is_dead(&inst->alg))
 117                 return;
 118
 119         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 120         if (hlist_unhashed(&inst->list))
 121                 return;
 122
 123         if (!tmpl || !crypto_tmpl_get(tmpl))
 124                 return;
 125
 126         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 127         list_move(&inst->alg.cra_list, list);
 128         hlist_del(&inst->list);
 129         inst->alg.cra_destroy = crypto_destroy_instance;
 130
 131         BUG_ON(!list_empty(&inst->alg.cra_users));
 132 }
 133
 134 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 135                           struct crypto_alg *nalg)
 136 {
 137         u32 new_type = (nalg ?: alg)->cra_flags;
 138         struct crypto_spawn *spawn, *n;
 139         LIST_HEAD(secondary_spawns);
 140         struct list_head *spawns;
 141         LIST_HEAD(stack);
 142         LIST_HEAD(top);
 143
 144         spawns = &alg->cra_users;
 145         list_for_each_entry_safe(spawn, n, spawns, list) {
 146                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 147                         continue;
 148
 149                 list_move(&spawn->list, &top);
 150         }
 151
 152         spawns = &top;
 153         do {
 154                 while (!list_empty(spawns)) {
 155                         struct crypto_instance *inst;
 156
 157                         spawn = list_first_entry(spawns, struct crypto_spawn,
 158                                                  list);
 159                         inst = spawn->inst;
 160
 161                         BUG_ON(&inst->alg == alg);
 162
 163                         list_move(&spawn->list, &stack);
 164
 165                         if (&inst->alg == nalg)
 166                                 break;
 167
 168                         spawn->alg = NULL;
 169                         spawns = &inst->alg.cra_users;
 170                 }
 171         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 172                                               &secondary_spawns)));
 173
 174         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 175                 if (spawn->alg)
 176                         list_move(&spawn->list, &spawn->alg->cra_users);
 177                 else
 178                         crypto_remove_instance(spawn->inst, list);
 179         }
 180 }
 181 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 182
 183 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 184 {
 185         struct crypto_alg *q;
 186         struct crypto_larval *larval;
 187         int ret = -EAGAIN;
 188
 189         if (crypto_is_dead(alg))
 190                 goto err;
 191
 192         INIT_LIST_HEAD(&alg->cra_users);
 193
 194         /* No cheating! */
 195         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 196
 197         ret = -EEXIST;
 198
 199         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 200                 if (q == alg)
 201                         goto err;
 202
 203                 if (crypto_is_moribund(q))
 204                         continue;
 205
 206                 if (crypto_is_larval(q)) {
 207                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 208                                 goto err;
 209                         continue;
 210                 }
 211
 212                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 213                     !strcmp(q->cra_name, alg->cra_driver_name))
 214                         goto err;
 215         }
 216
 217         larval = crypto_larval_alloc(alg->cra_name,
 218                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 219         if (IS_ERR(larval))
 220                 goto out;
 221
 222         ret = -ENOENT;
 223         larval->adult = crypto_mod_get(alg);
 224         if (!larval->adult)
 225                 goto free_larval;
 226
 227         atomic_set(&larval->alg.cra_refcnt, 1);
 228         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 229                CRYPTO_MAX_ALG_NAME);
 230         larval->alg.cra_priority = alg->cra_priority;
 231
 232         list_add(&alg->cra_list, &crypto_alg_list);
 233         list_add(&larval->alg.cra_list, &crypto_alg_list);
 234
 235 out:
 236         return larval;
 237
 238 free_larval:
 239         kfree(larval);
 240 err:
 241         larval = ERR_PTR(ret);
 242         goto out;
 243 }
 244
 245 void crypto_alg_tested(const char *name, int err)
 246 {
 247         struct crypto_larval *test;
 248         struct crypto_alg *alg;
 249         struct crypto_alg *q;
 250         LIST_HEAD(list);
 251
 252         down_write(&crypto_alg_sem);
 253         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 254                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 255                         continue;
 256
 257                 test = (struct crypto_larval *)q;
 258
 259                 if (!strcmp(q->cra_driver_name, name))
 260                         goto found;
 261         }
 262
 263         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 264         goto unlock;
 265
 266 found:
 267         q->cra_flags |= CRYPTO_ALG_DEAD;
 268         alg = test->adult;
 269         if (err || list_empty(&alg->cra_list))
 270                 goto complete;
 271
 272         alg->cra_flags |= CRYPTO_ALG_TESTED;
 273
 274         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 275                 if (q == alg)
 276                         continue;
 277
 278                 if (crypto_is_moribund(q))
 279                         continue;
 280
 281                 if (crypto_is_larval(q)) {
 282                         struct crypto_larval *larval = (void *)q;
 283
 284                         /*
 285                          * Check to see if either our generic name or
 286                          * specific name can satisfy the name requested
 287                          * by the larval entry q.
 288                          */
 289                         if (strcmp(alg->cra_name, q->cra_name) &&
 290                             strcmp(alg->cra_driver_name, q->cra_name))
 291                                 continue;
 292
 293                         if (larval->adult)
 294                                 continue;
 295                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 296                                 continue;
 297                         if (!crypto_mod_get(alg))
 298                                 continue;
 299
 300                         larval->adult = alg;
 301                         continue;
 302                 }
 303
 304                 if (strcmp(alg->cra_name, q->cra_name))
 305                         continue;
 306
 307                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 308                     q->cra_priority > alg->cra_priority)
 309                         continue;
 310
 311                 crypto_remove_spawns(q, &list, alg);
 312         }
 313
 314 complete:
 315         complete_all(&test->completion);
 316
 317 unlock:
 318         up_write(&crypto_alg_sem);
 319
 320         crypto_remove_final(&list);
 321 }
 322 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 323
 324 void crypto_remove_final(struct list_head *list)
 325 {
 326         struct crypto_alg *alg;
 327         struct crypto_alg *n;
 328
 329         list_for_each_entry_safe(alg, n, list, cra_list) {
 330                 list_del_init(&alg->cra_list);
 331                 crypto_alg_put(alg);
 332         }
 333 }
 334 EXPORT_SYMBOL_GPL(crypto_remove_final);
 335
 336 static void crypto_wait_for_test(struct crypto_larval *larval)
 337 {
 338         int err;
 339
 340         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 341         if (err != NOTIFY_STOP) {
 342                 if (WARN_ON(err != NOTIFY_DONE))
 343                         goto out;
 344                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 345         }
 346
 347         err = wait_for_completion_killable(&larval->completion);
 348         WARN_ON(err);
 349
 350 out:
 351         crypto_larval_kill(&larval->alg);
 352 }
 353
 354 int crypto_register_alg(struct crypto_alg *alg)
 355 {
 356         struct crypto_larval *larval;
 357         int err;
 358
 359         err = crypto_check_alg(alg);
 360         if (err)
 361                 return err;
 362
 363         down_write(&crypto_alg_sem);
 364         larval = __crypto_register_alg(alg);
 365         up_write(&crypto_alg_sem);
 366
 367         if (IS_ERR(larval))
 368                 return PTR_ERR(larval);
 369
 370         crypto_wait_for_test(larval);
 371         return 0;
 372 }
 373 EXPORT_SYMBOL_GPL(crypto_register_alg);
 374
 375 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 376 {
 377         if (unlikely(list_empty(&alg->cra_list)))
 378                 return -ENOENT;
 379
 380         alg->cra_flags |= CRYPTO_ALG_DEAD;
 381
 382         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 383         list_del_init(&alg->cra_list);
 384         crypto_remove_spawns(alg, list, NULL);
 385
 386         return 0;
 387 }
 388
 389 int crypto_unregister_alg(struct crypto_alg *alg)
 390 {
 391         int ret;
 392         LIST_HEAD(list);
 393
 394         down_write(&crypto_alg_sem);
 395         ret = crypto_remove_alg(alg, &list);
 396         up_write(&crypto_alg_sem);
 397
 398         if (ret)
 399                 return ret;
 400
 401         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 402         if (alg->cra_destroy)
 403                 alg->cra_destroy(alg);
 404
 405         crypto_remove_final(&list);
 406         return 0;
 407 }
 408 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 409
 410 int crypto_register_algs(struct crypto_alg *algs, int count)
 411 {
 412         int i, ret;
 413
 414         for (i = 0; i < count; i++) {
 415                 ret = crypto_register_alg(&algs[i]);
 416                 if (ret)
 417                         goto err;
 418         }
 419
 420         return 0;
 421
 422 err:
 423         for (--i; i >= 0; --i)
 424                 crypto_unregister_alg(&algs[i]);
 425
 426         return ret;
 427 }
 428 EXPORT_SYMBOL_GPL(crypto_register_algs);
 429
 430 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 431 {
 432         int i, ret;
 433
 434         for (i = 0; i < count; i++) {
 435                 ret = crypto_unregister_alg(&algs[i]);
 436                 if (ret)
 437                         pr_err("Failed to unregister %s %s: %d\n",
 438                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 439         }
 440
 441         return 0;
 442 }
 443 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 444
 445 int crypto_register_template(struct crypto_template *tmpl)
 446 {
 447         struct crypto_template *q;
 448         int err = -EEXIST;
 449
 450         down_write(&crypto_alg_sem);
 451
 452         crypto_check_module_sig(tmpl->module);
 453
 454         list_for_each_entry(q, &crypto_template_list, list) {
 455                 if (q == tmpl)
 456                         goto out;
 457         }
 458
 459         list_add(&tmpl->list, &crypto_template_list);
 460         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 461         err = 0;
 462 out:
 463         up_write(&crypto_alg_sem);
 464         return err;
 465 }
 466 EXPORT_SYMBOL_GPL(crypto_register_template);
 467
 468 void crypto_unregister_template(struct crypto_template *tmpl)
 469 {
 470         struct crypto_instance *inst;
 471         struct hlist_node *n;
 472         struct hlist_head *list;
 473         LIST_HEAD(users);
 474
 475         down_write(&crypto_alg_sem);
 476
 477         BUG_ON(list_empty(&tmpl->list));
 478         list_del_init(&tmpl->list);
 479
 480         list = &tmpl->instances;
 481         hlist_for_each_entry(inst, list, list) {
 482                 int err = crypto_remove_alg(&inst->alg, &users);
 483
 484                 BUG_ON(err);
 485         }
 486
 487         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 488
 489         up_write(&crypto_alg_sem);
 490
 491         hlist_for_each_entry_safe(inst, n, list, list) {
 492                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 493                 crypto_free_instance(inst);
 494         }
 495         crypto_remove_final(&users);
 496 }
 497 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 498
 499 static struct crypto_template *__crypto_lookup_template(const char *name)
 500 {
 501         struct crypto_template *q, *tmpl = NULL;
 502
 503         down_read(&crypto_alg_sem);
 504         list_for_each_entry(q, &crypto_template_list, list) {
 505                 if (strcmp(q->name, name))
 506                         continue;
 507                 if (unlikely(!crypto_tmpl_get(q)))
 508                         continue;
 509
 510                 tmpl = q;
 511                 break;
 512         }
 513         up_read(&crypto_alg_sem);
 514
 515         return tmpl;
 516 }
 517
 518 struct crypto_template *crypto_lookup_template(const char *name)
 519 {
 520         return try_then_request_module(__crypto_lookup_template(name),
 521                                        "crypto-%s", name);
 522 }
 523 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 524
 525 int crypto_register_instance(struct crypto_template *tmpl,
 526                              struct crypto_instance *inst)
 527 {
 528         struct crypto_larval *larval;
 529         int err;
 530
 531         err = crypto_check_alg(&inst->alg);
 532         if (err)
 533                 return err;
 534
 535         inst->alg.cra_module = tmpl->module;
 536         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 537
 538         if (unlikely(!crypto_mod_get(&inst->alg)))
 539                 return -EAGAIN;
 540
 541         down_write(&crypto_alg_sem);
 542
 543         larval = __crypto_register_alg(&inst->alg);
 544         if (IS_ERR(larval))
 545                 goto unlock;
 546
 547         hlist_add_head(&inst->list, &tmpl->instances);
 548         inst->tmpl = tmpl;
 549
 550 unlock:
 551         up_write(&crypto_alg_sem);
 552
 553         err = PTR_ERR(larval);
 554         if (IS_ERR(larval))
 555                 goto err;
 556
 557         crypto_wait_for_test(larval);
 558
 559         /* Remove instance if test failed */
 560         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 561                 crypto_unregister_instance(inst);
 562         err = 0;
 563
 564 err:
 565         crypto_mod_put(&inst->alg);
 566         return err;
 567 }
 568 EXPORT_SYMBOL_GPL(crypto_register_instance);
 569
 570 int crypto_unregister_instance(struct crypto_instance *inst)
 571 {
 572         LIST_HEAD(list);
 573
 574         down_write(&crypto_alg_sem);
 575
 576         crypto_remove_spawns(&inst->alg, &list, NULL);
 577         crypto_remove_instance(inst, &list);
 578
 579         up_write(&crypto_alg_sem);
 580
 581         crypto_remove_final(&list);
 582
 583         return 0;
 584 }
 585 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 586
 587 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 588                       struct crypto_instance *inst, u32 mask)
 589 {
 590         int err = -EAGAIN;
 591
 592         spawn->inst = inst;
 593         spawn->mask = mask;
 594
 595         down_write(&crypto_alg_sem);
 596         if (!crypto_is_moribund(alg)) {
 597                 list_add(&spawn->list, &alg->cra_users);
 598                 spawn->alg = alg;
 599                 err = 0;
 600         }
 601         up_write(&crypto_alg_sem);
 602
 603         return err;
 604 }
 605 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 606
 607 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 608                        struct crypto_instance *inst,
 609                        const struct crypto_type *frontend)
 610 {
 611         int err = -EINVAL;
 612
 613         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 614                 goto out;
 615
 616         spawn->frontend = frontend;
 617         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 618
 619 out:
 620         return err;
 621 }
 622 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 623
 624 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 625                       u32 type, u32 mask)
 626 {
 627         struct crypto_alg *alg;
 628         int err;
 629
 630         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 631         if (IS_ERR(alg))
 632                 return PTR_ERR(alg);
 633
 634         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 635         crypto_mod_put(alg);
 636         return err;
 637 }
 638 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 639
 640 void crypto_drop_spawn(struct crypto_spawn *spawn)
 641 {
 642         if (!spawn->alg)
 643                 return;
 644
 645         down_write(&crypto_alg_sem);
 646         list_del(&spawn->list);
 647         up_write(&crypto_alg_sem);
 648 }
 649 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 650
 651 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 652 {
 653         struct crypto_alg *alg;
 654         struct crypto_alg *alg2;
 655
 656         down_read(&crypto_alg_sem);
 657         alg = spawn->alg;
 658         alg2 = alg;
 659         if (alg2)
 660                 alg2 = crypto_mod_get(alg2);
 661         up_read(&crypto_alg_sem);
 662
 663         if (!alg2) {
 664                 if (alg)
 665                         crypto_shoot_alg(alg);
 666                 return ERR_PTR(-EAGAIN);
 667         }
 668
 669         return alg;
 670 }
 671
 672 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 673                                     u32 mask)
 674 {
 675         struct crypto_alg *alg;
 676         struct crypto_tfm *tfm;
 677
 678         alg = crypto_spawn_alg(spawn);
 679         if (IS_ERR(alg))
 680                 return ERR_CAST(alg);
 681
 682         tfm = ERR_PTR(-EINVAL);
 683         if (unlikely((alg->cra_flags ^ type) & mask))
 684                 goto out_put_alg;
 685
 686         tfm = __crypto_alloc_tfm(alg, type, mask);
 687         if (IS_ERR(tfm))
 688                 goto out_put_alg;
 689
 690         return tfm;
 691
 692 out_put_alg:
 693         crypto_mod_put(alg);
 694         return tfm;
 695 }
 696 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 697
 698 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 699 {
 700         struct crypto_alg *alg;
 701         struct crypto_tfm *tfm;
 702
 703         alg = crypto_spawn_alg(spawn);
 704         if (IS_ERR(alg))
 705                 return ERR_CAST(alg);
 706
 707         tfm = crypto_create_tfm(alg, spawn->frontend);
 708         if (IS_ERR(tfm))
 709                 goto out_put_alg;
 710
 711         return tfm;
 712
 713 out_put_alg:
 714         crypto_mod_put(alg);
 715         return tfm;
 716 }
 717 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 718
 719 int crypto_register_notifier(struct notifier_block *nb)
 720 {
 721         return blocking_notifier_chain_register(&crypto_chain, nb);
 722 }
 723 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 724
 725 int crypto_unregister_notifier(struct notifier_block *nb)
 726 {
 727         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 728 }
 729 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 730
 731 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 732 {
 733         struct rtattr *rta = tb[0];
 734         struct crypto_attr_type *algt;
 735
 736         if (!rta)
 737                 return ERR_PTR(-ENOENT);
 738         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 739                 return ERR_PTR(-EINVAL);
 740         if (rta->rta_type != CRYPTOA_TYPE)
 741                 return ERR_PTR(-EINVAL);
 742
 743         algt = RTA_DATA(rta);
 744
 745         return algt;
 746 }
 747 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 748
 749 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 750 {
 751         struct crypto_attr_type *algt;
 752
 753         algt = crypto_get_attr_type(tb);
 754         if (IS_ERR(algt))
 755                 return PTR_ERR(algt);
 756
 757         if ((algt->type ^ type) & algt->mask)
 758                 return -EINVAL;
 759
 760         return 0;
 761 }
 762 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 763
 764 const char *crypto_attr_alg_name(struct rtattr *rta)
 765 {
 766         struct crypto_attr_alg *alga;
 767
 768         if (!rta)
 769                 return ERR_PTR(-ENOENT);
 770         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 771                 return ERR_PTR(-EINVAL);
 772         if (rta->rta_type != CRYPTOA_ALG)
 773                 return ERR_PTR(-EINVAL);
 774
 775         alga = RTA_DATA(rta);
 776         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 777
 778         return alga->name;
 779 }
 780 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 781
 782 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 783                                     const struct crypto_type *frontend,
 784                                     u32 type, u32 mask)
 785 {
 786         const char *name;
 787
 788         name = crypto_attr_alg_name(rta);
 789         if (IS_ERR(name))
 790                 return ERR_CAST(name);
 791
 792         return crypto_find_alg(name, frontend, type, mask);
 793 }
 794 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 795
 796 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 797 {
 798         struct crypto_attr_u32 *nu32;
 799
 800         if (!rta)
 801                 return -ENOENT;
 802         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 803                 return -EINVAL;
 804         if (rta->rta_type != CRYPTOA_U32)
 805                 return -EINVAL;
 806
 807         nu32 = RTA_DATA(rta);
 808         *num = nu32->num;
 809
 810         return 0;
 811 }
 812 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 813
 814 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 815                              unsigned int head)
 816 {
 817         struct crypto_instance *inst;
 818         char *p;
 819         int err;
 820
 821         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 822                     GFP_KERNEL);
 823         if (!p)
 824                 return ERR_PTR(-ENOMEM);
 825
 826         inst = (void *)(p + head);
 827
 828         err = -ENAMETOOLONG;
 829         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 830                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 831                 goto err_free_inst;
 832
 833         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 834                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 835                 goto err_free_inst;
 836
 837         return p;
 838
 839 err_free_inst:
 840         kfree(p);
 841         return ERR_PTR(err);
 842 }
 843 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 844
 845 struct crypto_instance *crypto_alloc_instance(const char *name,
 846                                               struct crypto_alg *alg)
 847 {
 848         struct crypto_instance *inst;
 849         struct crypto_spawn *spawn;
 850         int err;
 851
 852         inst = crypto_alloc_instance2(name, alg, 0);
 853         if (IS_ERR(inst))
 854                 goto out;
 855
 856         spawn = crypto_instance_ctx(inst);
 857         err = crypto_init_spawn(spawn, alg, inst,
 858                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 859
 860         if (err)
 861                 goto err_free_inst;
 862
 863         return inst;
 864
 865 err_free_inst:
 866         kfree(inst);
 867         inst = ERR_PTR(err);
 868
 869 out:
 870         return inst;
 871 }
 872 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 873
 874 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 875 {
 876         INIT_LIST_HEAD(&queue->list);
 877         queue->backlog = &queue->list;
 878         queue->qlen = 0;
 879         queue->max_qlen = max_qlen;
 880 }
 881 EXPORT_SYMBOL_GPL(crypto_init_queue);
 882
 883 int crypto_enqueue_request(struct crypto_queue *queue,
 884                            struct crypto_async_request *request)
 885 {
 886         int err = -EINPROGRESS;
 887
 888         if (unlikely(queue->qlen >= queue->max_qlen)) {
 889                 err = -EBUSY;
 890                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 891                         goto out;
 892                 if (queue->backlog == &queue->list)
 893                         queue->backlog = &request->list;
 894         }
 895
 896         queue->qlen++;
 897         list_add_tail(&request->list, &queue->list);
 898
 899 out:
 900         return err;
 901 }
 902 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 903
 904 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 905 {
 906         struct list_head *request;
 907
 908         if (unlikely(!queue->qlen))
 909                 return NULL;
 910
 911         queue->qlen--;
 912
 913         if (queue->backlog != &queue->list)
 914                 queue->backlog = queue->backlog->next;
 915
 916         request = queue->list.next;
 917         list_del(request);
 918
 919         return list_entry(request, struct crypto_async_request, list);
 920 }
 921 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 922
 923 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 924 {
 925         struct crypto_async_request *req;
 926
 927         list_for_each_entry(req, &queue->list, list) {
 928                 if (req->tfm == tfm)
 929                         return 1;
 930         }
 931
 932         return 0;
 933 }
 934 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 935
 936 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 937 {
 938         u8 *b = (a + size);
 939         u8 c;
 940
 941         for (; size; size--) {
 942                 c = *--b + 1;
 943                 *b = c;
 944                 if (c)
 945                         break;
 946         }
 947 }
 948
 949 void crypto_inc(u8 *a, unsigned int size)
 950 {
 951         __be32 *b = (__be32 *)(a + size);
 952         u32 c;
 953
 954         for (; size >= 4; size -= 4) {
 955                 c = be32_to_cpu(*--b) + 1;
 956                 *b = cpu_to_be32(c);
 957                 if (c)
 958                         return;
 959         }
 960
 961         crypto_inc_byte(a, size);
 962 }
 963 EXPORT_SYMBOL_GPL(crypto_inc);
 964
 965 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 966 {
 967         for (; size; size--)
 968                 *a++ ^= *b++;
 969 }
 970
 971 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 972 {
 973         u32 *a = (u32 *)dst;
 974         u32 *b = (u32 *)src;
 975
 976         for (; size >= 4; size -= 4)
 977                 *a++ ^= *b++;
 978
 979         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 980 }
 981 EXPORT_SYMBOL_GPL(crypto_xor);
 982
 983 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 984 {
 985         return alg->cra_ctxsize +
 986                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
 987 }
 988 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
 989
 990 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
 991                         u32 type, u32 mask)
 992 {
 993         int ret = 0;
 994         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
 995
 996         if (!IS_ERR(alg)) {
 997                 crypto_mod_put(alg);
 998                 ret = 1;
 999         }
1000
1001         return ret;
1002 }
1003 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1004
1005 static int __init crypto_algapi_init(void)
1006 {
1007         crypto_init_proc();
1008         return 0;
1009 }
1010
1011 static void __exit crypto_algapi_exit(void)
1012 {
1013         crypto_exit_proc();
1014 }
1015
1016 module_init(crypto_algapi_init);
1017 module_exit(crypto_algapi_exit);
1018
1019 MODULE_LICENSE("GPL");
1020 MODULE_DESCRIPTION("Cryptographic algorithms API");