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 int crypto_check_alg(struct crypto_alg *alg)
  45 {
  46         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  47                 return -EINVAL;
  48
  49         if (alg->cra_blocksize > PAGE_SIZE / 8)
  50                 return -EINVAL;
  51
  52         if (alg->cra_priority < 0)
  53                 return -EINVAL;
  54
  55         return crypto_set_driver_name(alg);
  56 }
  57
  58 static void crypto_destroy_instance(struct crypto_alg *alg)
  59 {
  60         struct crypto_instance *inst = (void *)alg;
  61         struct crypto_template *tmpl = inst->tmpl;
  62
  63         tmpl->free(inst);
  64         crypto_tmpl_put(tmpl);
  65 }
  66
  67 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  68                                             struct list_head *stack,
  69                                             struct list_head *top,
  70                                             struct list_head *secondary_spawns)
  71 {
  72         struct crypto_spawn *spawn, *n;
  73
  74         if (list_empty(stack))
  75                 return NULL;
  76
  77         spawn = list_first_entry(stack, struct crypto_spawn, list);
  78         n = list_entry(spawn->list.next, struct crypto_spawn, list);
  79
  80         if (spawn->alg && &n->list != stack && !n->alg)
  81                 n->alg = (n->list.next == stack) ? alg :
  82                          &list_entry(n->list.next, struct crypto_spawn,
  83                                      list)->inst->alg;
  84
  85         list_move(&spawn->list, secondary_spawns);
  86
  87         return &n->list == stack ? top : &n->inst->alg.cra_users;
  88 }
  89
  90 static void crypto_remove_spawn(struct crypto_spawn *spawn,
  91                                 struct list_head *list)
  92 {
  93         struct crypto_instance *inst = spawn->inst;
  94         struct crypto_template *tmpl = inst->tmpl;
  95
  96         if (crypto_is_dead(&inst->alg))
  97                 return;
  98
  99         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 100         if (hlist_unhashed(&inst->list))
 101                 return;
 102
 103         if (!tmpl || !crypto_tmpl_get(tmpl))
 104                 return;
 105
 106         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 107         list_move(&inst->alg.cra_list, list);
 108         hlist_del(&inst->list);
 109         inst->alg.cra_destroy = crypto_destroy_instance;
 110
 111         BUG_ON(!list_empty(&inst->alg.cra_users));
 112 }
 113
 114 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 115                           struct crypto_alg *nalg)
 116 {
 117         u32 new_type = (nalg ?: alg)->cra_flags;
 118         struct crypto_spawn *spawn, *n;
 119         LIST_HEAD(secondary_spawns);
 120         struct list_head *spawns;
 121         LIST_HEAD(stack);
 122         LIST_HEAD(top);
 123
 124         spawns = &alg->cra_users;
 125         list_for_each_entry_safe(spawn, n, spawns, list) {
 126                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 127                         continue;
 128
 129                 list_move(&spawn->list, &top);
 130         }
 131
 132         spawns = &top;
 133         do {
 134                 while (!list_empty(spawns)) {
 135                         struct crypto_instance *inst;
 136
 137                         spawn = list_first_entry(spawns, struct crypto_spawn,
 138                                                  list);
 139                         inst = spawn->inst;
 140
 141                         BUG_ON(&inst->alg == alg);
 142
 143                         list_move(&spawn->list, &stack);
 144
 145                         if (&inst->alg == nalg)
 146                                 break;
 147
 148                         spawn->alg = NULL;
 149                         spawns = &inst->alg.cra_users;
 150
 151                         /*
 152                          * We may encounter an unregistered instance here, since
 153                          * an instance's spawns are set up prior to the instance
 154                          * being registered.  An unregistered instance will have
 155                          * NULL ->cra_users.next, since ->cra_users isn't
 156                          * properly initialized until registration.  But an
 157                          * unregistered instance cannot have any users, so treat
 158                          * it the same as ->cra_users being empty.
 159                          */
 160                         if (spawns->next == NULL)
 161                                 break;
 162                 }
 163         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 164                                               &secondary_spawns)));
 165
 166         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 167                 if (spawn->alg)
 168                         list_move(&spawn->list, &spawn->alg->cra_users);
 169                 else
 170                         crypto_remove_spawn(spawn, list);
 171         }
 172 }
 173 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 174
 175 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 176 {
 177         struct crypto_alg *q;
 178         struct crypto_larval *larval;
 179         int ret = -EAGAIN;
 180
 181         if (crypto_is_dead(alg))
 182                 goto err;
 183
 184         INIT_LIST_HEAD(&alg->cra_users);
 185
 186         /* No cheating! */
 187         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 188
 189         ret = -EEXIST;
 190
 191         atomic_set(&alg->cra_refcnt, 1);
 192         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 193                 if (q == alg)
 194                         goto err;
 195
 196                 if (crypto_is_moribund(q))
 197                         continue;
 198
 199                 if (crypto_is_larval(q)) {
 200                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 201                                 goto err;
 202                         continue;
 203                 }
 204
 205                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 206                     !strcmp(q->cra_name, alg->cra_driver_name))
 207                         goto err;
 208         }
 209
 210         larval = crypto_larval_alloc(alg->cra_name,
 211                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 212         if (IS_ERR(larval))
 213                 goto out;
 214
 215         ret = -ENOENT;
 216         larval->adult = crypto_mod_get(alg);
 217         if (!larval->adult)
 218                 goto free_larval;
 219
 220         atomic_set(&larval->alg.cra_refcnt, 1);
 221         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 222                CRYPTO_MAX_ALG_NAME);
 223         larval->alg.cra_priority = alg->cra_priority;
 224
 225         list_add(&alg->cra_list, &crypto_alg_list);
 226         list_add(&larval->alg.cra_list, &crypto_alg_list);
 227
 228 out:
 229         return larval;
 230
 231 free_larval:
 232         kfree(larval);
 233 err:
 234         larval = ERR_PTR(ret);
 235         goto out;
 236 }
 237
 238 void crypto_alg_tested(const char *name, int err)
 239 {
 240         struct crypto_larval *test;
 241         struct crypto_alg *alg;
 242         struct crypto_alg *q;
 243         LIST_HEAD(list);
 244
 245         down_write(&crypto_alg_sem);
 246         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 247                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 248                         continue;
 249
 250                 test = (struct crypto_larval *)q;
 251
 252                 if (!strcmp(q->cra_driver_name, name))
 253                         goto found;
 254         }
 255
 256         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 257         goto unlock;
 258
 259 found:
 260         q->cra_flags |= CRYPTO_ALG_DEAD;
 261         alg = test->adult;
 262         if (err || list_empty(&alg->cra_list))
 263                 goto complete;
 264
 265         alg->cra_flags |= CRYPTO_ALG_TESTED;
 266
 267         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 268                 if (q == alg)
 269                         continue;
 270
 271                 if (crypto_is_moribund(q))
 272                         continue;
 273
 274                 if (crypto_is_larval(q)) {
 275                         struct crypto_larval *larval = (void *)q;
 276
 277                         /*
 278                          * Check to see if either our generic name or
 279                          * specific name can satisfy the name requested
 280                          * by the larval entry q.
 281                          */
 282                         if (strcmp(alg->cra_name, q->cra_name) &&
 283                             strcmp(alg->cra_driver_name, q->cra_name))
 284                                 continue;
 285
 286                         if (larval->adult)
 287                                 continue;
 288                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 289                                 continue;
 290                         if (!crypto_mod_get(alg))
 291                                 continue;
 292
 293                         larval->adult = alg;
 294                         continue;
 295                 }
 296
 297                 if (strcmp(alg->cra_name, q->cra_name))
 298                         continue;
 299
 300                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 301                     q->cra_priority > alg->cra_priority)
 302                         continue;
 303
 304                 crypto_remove_spawns(q, &list, alg);
 305         }
 306
 307 complete:
 308         complete_all(&test->completion);
 309
 310 unlock:
 311         up_write(&crypto_alg_sem);
 312
 313         crypto_remove_final(&list);
 314 }
 315 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 316
 317 void crypto_remove_final(struct list_head *list)
 318 {
 319         struct crypto_alg *alg;
 320         struct crypto_alg *n;
 321
 322         list_for_each_entry_safe(alg, n, list, cra_list) {
 323                 list_del_init(&alg->cra_list);
 324                 crypto_alg_put(alg);
 325         }
 326 }
 327 EXPORT_SYMBOL_GPL(crypto_remove_final);
 328
 329 static void crypto_wait_for_test(struct crypto_larval *larval)
 330 {
 331         int err;
 332
 333         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 334         if (err != NOTIFY_STOP) {
 335                 if (WARN_ON(err != NOTIFY_DONE))
 336                         goto out;
 337                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 338         }
 339
 340         err = wait_for_completion_killable(&larval->completion);
 341         WARN_ON(err);
 342
 343 out:
 344         crypto_larval_kill(&larval->alg);
 345 }
 346
 347 int crypto_register_alg(struct crypto_alg *alg)
 348 {
 349         struct crypto_larval *larval;
 350         int err;
 351
 352         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 353         err = crypto_check_alg(alg);
 354         if (err)
 355                 return err;
 356
 357         down_write(&crypto_alg_sem);
 358         larval = __crypto_register_alg(alg);
 359         up_write(&crypto_alg_sem);
 360
 361         if (IS_ERR(larval))
 362                 return PTR_ERR(larval);
 363
 364         crypto_wait_for_test(larval);
 365         return 0;
 366 }
 367 EXPORT_SYMBOL_GPL(crypto_register_alg);
 368
 369 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 370 {
 371         if (unlikely(list_empty(&alg->cra_list)))
 372                 return -ENOENT;
 373
 374         alg->cra_flags |= CRYPTO_ALG_DEAD;
 375
 376         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 377         list_del_init(&alg->cra_list);
 378         crypto_remove_spawns(alg, list, NULL);
 379
 380         return 0;
 381 }
 382
 383 int crypto_unregister_alg(struct crypto_alg *alg)
 384 {
 385         int ret;
 386         LIST_HEAD(list);
 387
 388         down_write(&crypto_alg_sem);
 389         ret = crypto_remove_alg(alg, &list);
 390         up_write(&crypto_alg_sem);
 391
 392         if (ret)
 393                 return ret;
 394
 395         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 396         if (alg->cra_destroy)
 397                 alg->cra_destroy(alg);
 398
 399         crypto_remove_final(&list);
 400         return 0;
 401 }
 402 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 403
 404 int crypto_register_algs(struct crypto_alg *algs, int count)
 405 {
 406         int i, ret;
 407
 408         for (i = 0; i < count; i++) {
 409                 ret = crypto_register_alg(&algs[i]);
 410                 if (ret)
 411                         goto err;
 412         }
 413
 414         return 0;
 415
 416 err:
 417         for (--i; i >= 0; --i)
 418                 crypto_unregister_alg(&algs[i]);
 419
 420         return ret;
 421 }
 422 EXPORT_SYMBOL_GPL(crypto_register_algs);
 423
 424 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 425 {
 426         int i, ret;
 427
 428         for (i = 0; i < count; i++) {
 429                 ret = crypto_unregister_alg(&algs[i]);
 430                 if (ret)
 431                         pr_err("Failed to unregister %s %s: %d\n",
 432                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 433         }
 434
 435         return 0;
 436 }
 437 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 438
 439 int crypto_register_template(struct crypto_template *tmpl)
 440 {
 441         struct crypto_template *q;
 442         int err = -EEXIST;
 443
 444         down_write(&crypto_alg_sem);
 445
 446         list_for_each_entry(q, &crypto_template_list, list) {
 447                 if (q == tmpl)
 448                         goto out;
 449         }
 450
 451         list_add(&tmpl->list, &crypto_template_list);
 452         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 453         err = 0;
 454 out:
 455         up_write(&crypto_alg_sem);
 456         return err;
 457 }
 458 EXPORT_SYMBOL_GPL(crypto_register_template);
 459
 460 void crypto_unregister_template(struct crypto_template *tmpl)
 461 {
 462         struct crypto_instance *inst;
 463         struct hlist_node *n;
 464         struct hlist_head *list;
 465         LIST_HEAD(users);
 466
 467         down_write(&crypto_alg_sem);
 468
 469         BUG_ON(list_empty(&tmpl->list));
 470         list_del_init(&tmpl->list);
 471
 472         list = &tmpl->instances;
 473         hlist_for_each_entry(inst, list, list) {
 474                 int err = crypto_remove_alg(&inst->alg, &users);
 475                 BUG_ON(err);
 476         }
 477
 478         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 479
 480         up_write(&crypto_alg_sem);
 481
 482         hlist_for_each_entry_safe(inst, n, list, list) {
 483                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 484                 tmpl->free(inst);
 485         }
 486         crypto_remove_final(&users);
 487 }
 488 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 489
 490 static struct crypto_template *__crypto_lookup_template(const char *name)
 491 {
 492         struct crypto_template *q, *tmpl = NULL;
 493
 494         down_read(&crypto_alg_sem);
 495         list_for_each_entry(q, &crypto_template_list, list) {
 496                 if (strcmp(q->name, name))
 497                         continue;
 498                 if (unlikely(!crypto_tmpl_get(q)))
 499                         continue;
 500
 501                 tmpl = q;
 502                 break;
 503         }
 504         up_read(&crypto_alg_sem);
 505
 506         return tmpl;
 507 }
 508
 509 struct crypto_template *crypto_lookup_template(const char *name)
 510 {
 511         return try_then_request_module(__crypto_lookup_template(name),
 512                                        "crypto-%s", name);
 513 }
 514 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 515
 516 int crypto_register_instance(struct crypto_template *tmpl,
 517                              struct crypto_instance *inst)
 518 {
 519         struct crypto_larval *larval;
 520         int err;
 521
 522         err = crypto_check_alg(&inst->alg);
 523         if (err)
 524                 goto err;
 525
 526         inst->alg.cra_module = tmpl->module;
 527         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 528
 529         down_write(&crypto_alg_sem);
 530
 531         larval = __crypto_register_alg(&inst->alg);
 532         if (IS_ERR(larval))
 533                 goto unlock;
 534
 535         hlist_add_head(&inst->list, &tmpl->instances);
 536         inst->tmpl = tmpl;
 537
 538 unlock:
 539         up_write(&crypto_alg_sem);
 540
 541         err = PTR_ERR(larval);
 542         if (IS_ERR(larval))
 543                 goto err;
 544
 545         crypto_wait_for_test(larval);
 546         err = 0;
 547
 548 err:
 549         return err;
 550 }
 551 EXPORT_SYMBOL_GPL(crypto_register_instance);
 552
 553 int crypto_unregister_instance(struct crypto_alg *alg)
 554 {
 555         int err;
 556         struct crypto_instance *inst = (void *)alg;
 557         struct crypto_template *tmpl = inst->tmpl;
 558         LIST_HEAD(users);
 559
 560         if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
 561                 return -EINVAL;
 562
 563         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 564
 565         down_write(&crypto_alg_sem);
 566
 567         hlist_del_init(&inst->list);
 568         err = crypto_remove_alg(alg, &users);
 569
 570         up_write(&crypto_alg_sem);
 571
 572         if (err)
 573                 return err;
 574
 575         tmpl->free(inst);
 576         crypto_remove_final(&users);
 577
 578         return 0;
 579 }
 580 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 581
 582 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 583                       struct crypto_instance *inst, u32 mask)
 584 {
 585         int err = -EAGAIN;
 586
 587         spawn->inst = inst;
 588         spawn->mask = mask;
 589
 590         down_write(&crypto_alg_sem);
 591         if (!crypto_is_moribund(alg)) {
 592                 list_add(&spawn->list, &alg->cra_users);
 593                 spawn->alg = alg;
 594                 err = 0;
 595         }
 596         up_write(&crypto_alg_sem);
 597
 598         return err;
 599 }
 600 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 601
 602 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 603                        struct crypto_instance *inst,
 604                        const struct crypto_type *frontend)
 605 {
 606         int err = -EINVAL;
 607
 608         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 609                 goto out;
 610
 611         spawn->frontend = frontend;
 612         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 613
 614 out:
 615         return err;
 616 }
 617 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 618
 619 void crypto_drop_spawn(struct crypto_spawn *spawn)
 620 {
 621         if (!spawn->alg)
 622                 return;
 623
 624         down_write(&crypto_alg_sem);
 625         list_del(&spawn->list);
 626         up_write(&crypto_alg_sem);
 627 }
 628 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 629
 630 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 631 {
 632         struct crypto_alg *alg;
 633         struct crypto_alg *alg2;
 634
 635         down_read(&crypto_alg_sem);
 636         alg = spawn->alg;
 637         alg2 = alg;
 638         if (alg2)
 639                 alg2 = crypto_mod_get(alg2);
 640         up_read(&crypto_alg_sem);
 641
 642         if (!alg2) {
 643                 if (alg)
 644                         crypto_shoot_alg(alg);
 645                 return ERR_PTR(-EAGAIN);
 646         }
 647
 648         return alg;
 649 }
 650
 651 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 652                                     u32 mask)
 653 {
 654         struct crypto_alg *alg;
 655         struct crypto_tfm *tfm;
 656
 657         alg = crypto_spawn_alg(spawn);
 658         if (IS_ERR(alg))
 659                 return ERR_CAST(alg);
 660
 661         tfm = ERR_PTR(-EINVAL);
 662         if (unlikely((alg->cra_flags ^ type) & mask))
 663                 goto out_put_alg;
 664
 665         tfm = __crypto_alloc_tfm(alg, type, mask);
 666         if (IS_ERR(tfm))
 667                 goto out_put_alg;
 668
 669         return tfm;
 670
 671 out_put_alg:
 672         crypto_mod_put(alg);
 673         return tfm;
 674 }
 675 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 676
 677 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 678 {
 679         struct crypto_alg *alg;
 680         struct crypto_tfm *tfm;
 681
 682         alg = crypto_spawn_alg(spawn);
 683         if (IS_ERR(alg))
 684                 return ERR_CAST(alg);
 685
 686         tfm = crypto_create_tfm(alg, spawn->frontend);
 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_tfm2);
 697
 698 int crypto_register_notifier(struct notifier_block *nb)
 699 {
 700         return blocking_notifier_chain_register(&crypto_chain, nb);
 701 }
 702 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 703
 704 int crypto_unregister_notifier(struct notifier_block *nb)
 705 {
 706         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 707 }
 708 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 709
 710 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 711 {
 712         struct rtattr *rta = tb[0];
 713         struct crypto_attr_type *algt;
 714
 715         if (!rta)
 716                 return ERR_PTR(-ENOENT);
 717         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 718                 return ERR_PTR(-EINVAL);
 719         if (rta->rta_type != CRYPTOA_TYPE)
 720                 return ERR_PTR(-EINVAL);
 721
 722         algt = RTA_DATA(rta);
 723
 724         return algt;
 725 }
 726 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 727
 728 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 729 {
 730         struct crypto_attr_type *algt;
 731
 732         algt = crypto_get_attr_type(tb);
 733         if (IS_ERR(algt))
 734                 return PTR_ERR(algt);
 735
 736         if ((algt->type ^ type) & algt->mask)
 737                 return -EINVAL;
 738
 739         return 0;
 740 }
 741 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 742
 743 const char *crypto_attr_alg_name(struct rtattr *rta)
 744 {
 745         struct crypto_attr_alg *alga;
 746
 747         if (!rta)
 748                 return ERR_PTR(-ENOENT);
 749         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 750                 return ERR_PTR(-EINVAL);
 751         if (rta->rta_type != CRYPTOA_ALG)
 752                 return ERR_PTR(-EINVAL);
 753
 754         alga = RTA_DATA(rta);
 755         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 756
 757         return alga->name;
 758 }
 759 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 760
 761 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 762                                     const struct crypto_type *frontend,
 763                                     u32 type, u32 mask)
 764 {
 765         const char *name;
 766
 767         name = crypto_attr_alg_name(rta);
 768         if (IS_ERR(name))
 769                 return ERR_CAST(name);
 770
 771         return crypto_find_alg(name, frontend, type, mask);
 772 }
 773 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 774
 775 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 776 {
 777         struct crypto_attr_u32 *nu32;
 778
 779         if (!rta)
 780                 return -ENOENT;
 781         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 782                 return -EINVAL;
 783         if (rta->rta_type != CRYPTOA_U32)
 784                 return -EINVAL;
 785
 786         nu32 = RTA_DATA(rta);
 787         *num = nu32->num;
 788
 789         return 0;
 790 }
 791 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 792
 793 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 794                              unsigned int head)
 795 {
 796         struct crypto_instance *inst;
 797         char *p;
 798         int err;
 799
 800         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 801                     GFP_KERNEL);
 802         if (!p)
 803                 return ERR_PTR(-ENOMEM);
 804
 805         inst = (void *)(p + head);
 806
 807         err = -ENAMETOOLONG;
 808         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 809                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 810                 goto err_free_inst;
 811
 812         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 813                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 814                 goto err_free_inst;
 815
 816         return p;
 817
 818 err_free_inst:
 819         kfree(p);
 820         return ERR_PTR(err);
 821 }
 822 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 823
 824 struct crypto_instance *crypto_alloc_instance(const char *name,
 825                                               struct crypto_alg *alg)
 826 {
 827         struct crypto_instance *inst;
 828         struct crypto_spawn *spawn;
 829         int err;
 830
 831         inst = crypto_alloc_instance2(name, alg, 0);
 832         if (IS_ERR(inst))
 833                 goto out;
 834
 835         spawn = crypto_instance_ctx(inst);
 836         err = crypto_init_spawn(spawn, alg, inst,
 837                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 838
 839         if (err)
 840                 goto err_free_inst;
 841
 842         return inst;
 843
 844 err_free_inst:
 845         kfree(inst);
 846         inst = ERR_PTR(err);
 847
 848 out:
 849         return inst;
 850 }
 851 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 852
 853 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 854 {
 855         INIT_LIST_HEAD(&queue->list);
 856         queue->backlog = &queue->list;
 857         queue->qlen = 0;
 858         queue->max_qlen = max_qlen;
 859 }
 860 EXPORT_SYMBOL_GPL(crypto_init_queue);
 861
 862 int crypto_enqueue_request(struct crypto_queue *queue,
 863                            struct crypto_async_request *request)
 864 {
 865         int err = -EINPROGRESS;
 866
 867         if (unlikely(queue->qlen >= queue->max_qlen)) {
 868                 err = -EBUSY;
 869                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 870                         goto out;
 871                 if (queue->backlog == &queue->list)
 872                         queue->backlog = &request->list;
 873         }
 874
 875         queue->qlen++;
 876         list_add_tail(&request->list, &queue->list);
 877
 878 out:
 879         return err;
 880 }
 881 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 882
 883 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 884 {
 885         struct list_head *request;
 886
 887         if (unlikely(!queue->qlen))
 888                 return NULL;
 889
 890         queue->qlen--;
 891
 892         if (queue->backlog != &queue->list)
 893                 queue->backlog = queue->backlog->next;
 894
 895         request = queue->list.next;
 896         list_del(request);
 897
 898         return (char *)list_entry(request, struct crypto_async_request, list) -
 899                offset;
 900 }
 901 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 902
 903 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 904 {
 905         return __crypto_dequeue_request(queue, 0);
 906 }
 907 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 908
 909 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 910 {
 911         struct crypto_async_request *req;
 912
 913         list_for_each_entry(req, &queue->list, list) {
 914                 if (req->tfm == tfm)
 915                         return 1;
 916         }
 917
 918         return 0;
 919 }
 920 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 921
 922 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 923 {
 924         u8 *b = (a + size);
 925         u8 c;
 926
 927         for (; size; size--) {
 928                 c = *--b + 1;
 929                 *b = c;
 930                 if (c)
 931                         break;
 932         }
 933 }
 934
 935 void crypto_inc(u8 *a, unsigned int size)
 936 {
 937         __be32 *b = (__be32 *)(a + size);
 938         u32 c;
 939
 940         for (; size >= 4; size -= 4) {
 941                 c = be32_to_cpu(*--b) + 1;
 942                 *b = cpu_to_be32(c);
 943                 if (c)
 944                         return;
 945         }
 946
 947         crypto_inc_byte(a, size);
 948 }
 949 EXPORT_SYMBOL_GPL(crypto_inc);
 950
 951 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 952 {
 953         for (; size; size--)
 954                 *a++ ^= *b++;
 955 }
 956
 957 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 958 {
 959         u32 *a = (u32 *)dst;
 960         u32 *b = (u32 *)src;
 961
 962         for (; size >= 4; size -= 4)
 963                 *a++ ^= *b++;
 964
 965         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 966 }
 967 EXPORT_SYMBOL_GPL(crypto_xor);
 968
 969 static int __init crypto_algapi_init(void)
 970 {
 971         crypto_init_proc();
 972         return 0;
 973 }
 974
 975 static void __exit crypto_algapi_exit(void)
 976 {
 977         crypto_exit_proc();
 978 }
 979
 980 module_init(crypto_algapi_init);
 981 module_exit(crypto_algapi_exit);
 982
 983 MODULE_LICENSE("GPL");
 984 MODULE_DESCRIPTION("Cryptographic algorithms API");