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 void crypto_larval_error(const char *name, u32 type, u32 mask)
  28 {
  29         struct crypto_alg *alg;
  30
  31         alg = crypto_alg_lookup(name, type, mask);
  32
  33         if (alg) {
  34                 if (crypto_is_larval(alg)) {
  35                         struct crypto_larval *larval = (void *)alg;
  36                         complete_all(&larval->completion);
  37                 }
  38                 crypto_mod_put(alg);
  39         }
  40 }
  41 EXPORT_SYMBOL_GPL(crypto_larval_error);
  42
  43 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  44 {
  45         static const char suffix[] = "-generic";
  46         char *driver_name = alg->cra_driver_name;
  47         int len;
  48
  49         if (*driver_name)
  50                 return 0;
  51
  52         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  53         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  54                 return -ENAMETOOLONG;
  55
  56         memcpy(driver_name + len, suffix, sizeof(suffix));
  57         return 0;
  58 }
  59
  60 static int crypto_check_alg(struct crypto_alg *alg)
  61 {
  62         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  63                 return -EINVAL;
  64
  65         if (alg->cra_blocksize > PAGE_SIZE / 8)
  66                 return -EINVAL;
  67
  68         if (alg->cra_priority < 0)
  69                 return -EINVAL;
  70
  71         return crypto_set_driver_name(alg);
  72 }
  73
  74 static void crypto_destroy_instance(struct crypto_alg *alg)
  75 {
  76         struct crypto_instance *inst = (void *)alg;
  77         struct crypto_template *tmpl = inst->tmpl;
  78
  79         tmpl->free(inst);
  80         crypto_tmpl_put(tmpl);
  81 }
  82
  83 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  84                                             struct list_head *stack,
  85                                             struct list_head *top,
  86                                             struct list_head *secondary_spawns)
  87 {
  88         struct crypto_spawn *spawn, *n;
  89
  90         if (list_empty(stack))
  91                 return NULL;
  92
  93         spawn = list_first_entry(stack, struct crypto_spawn, list);
  94         n = list_entry(spawn->list.next, struct crypto_spawn, list);
  95
  96         if (spawn->alg && &n->list != stack && !n->alg)
  97                 n->alg = (n->list.next == stack) ? alg :
  98                          &list_entry(n->list.next, struct crypto_spawn,
  99                                      list)->inst->alg;
 100
 101         list_move(&spawn->list, secondary_spawns);
 102
 103         return &n->list == stack ? top : &n->inst->alg.cra_users;
 104 }
 105
 106 static void crypto_remove_spawn(struct crypto_spawn *spawn,
 107                                 struct list_head *list)
 108 {
 109         struct crypto_instance *inst = spawn->inst;
 110         struct crypto_template *tmpl = inst->tmpl;
 111
 112         if (crypto_is_dead(&inst->alg))
 113                 return;
 114
 115         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 116         if (hlist_unhashed(&inst->list))
 117                 return;
 118
 119         if (!tmpl || !crypto_tmpl_get(tmpl))
 120                 return;
 121
 122         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 123         list_move(&inst->alg.cra_list, list);
 124         hlist_del(&inst->list);
 125         inst->alg.cra_destroy = crypto_destroy_instance;
 126
 127         BUG_ON(!list_empty(&inst->alg.cra_users));
 128 }
 129
 130 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 131                           struct crypto_alg *nalg)
 132 {
 133         u32 new_type = (nalg ?: alg)->cra_flags;
 134         struct crypto_spawn *spawn, *n;
 135         LIST_HEAD(secondary_spawns);
 136         struct list_head *spawns;
 137         LIST_HEAD(stack);
 138         LIST_HEAD(top);
 139
 140         spawns = &alg->cra_users;
 141         list_for_each_entry_safe(spawn, n, spawns, list) {
 142                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 143                         continue;
 144
 145                 list_move(&spawn->list, &top);
 146         }
 147
 148         spawns = &top;
 149         do {
 150                 while (!list_empty(spawns)) {
 151                         struct crypto_instance *inst;
 152
 153                         spawn = list_first_entry(spawns, struct crypto_spawn,
 154                                                  list);
 155                         inst = spawn->inst;
 156
 157                         BUG_ON(&inst->alg == alg);
 158
 159                         list_move(&spawn->list, &stack);
 160
 161                         if (&inst->alg == nalg)
 162                                 break;
 163
 164                         spawn->alg = NULL;
 165                         spawns = &inst->alg.cra_users;
 166                 }
 167         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 168                                               &secondary_spawns)));
 169
 170         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 171                 if (spawn->alg)
 172                         list_move(&spawn->list, &spawn->alg->cra_users);
 173                 else
 174                         crypto_remove_spawn(spawn, list);
 175         }
 176 }
 177 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 178
 179 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 180 {
 181         struct crypto_alg *q;
 182         struct crypto_larval *larval;
 183         int ret = -EAGAIN;
 184
 185         if (crypto_is_dead(alg))
 186                 goto err;
 187
 188         INIT_LIST_HEAD(&alg->cra_users);
 189
 190         /* No cheating! */
 191         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 192
 193         ret = -EEXIST;
 194
 195         atomic_set(&alg->cra_refcnt, 1);
 196         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 197                 if (q == alg)
 198                         goto err;
 199
 200                 if (crypto_is_moribund(q))
 201                         continue;
 202
 203                 if (crypto_is_larval(q)) {
 204                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 205                                 goto err;
 206                         continue;
 207                 }
 208
 209                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 210                     !strcmp(q->cra_name, alg->cra_driver_name))
 211                         goto err;
 212         }
 213
 214         larval = crypto_larval_alloc(alg->cra_name,
 215                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 216         if (IS_ERR(larval))
 217                 goto out;
 218
 219         ret = -ENOENT;
 220         larval->adult = crypto_mod_get(alg);
 221         if (!larval->adult)
 222                 goto free_larval;
 223
 224         atomic_set(&larval->alg.cra_refcnt, 1);
 225         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 226                CRYPTO_MAX_ALG_NAME);
 227         larval->alg.cra_priority = alg->cra_priority;
 228
 229         list_add(&alg->cra_list, &crypto_alg_list);
 230         list_add(&larval->alg.cra_list, &crypto_alg_list);
 231
 232 out:
 233         return larval;
 234
 235 free_larval:
 236         kfree(larval);
 237 err:
 238         larval = ERR_PTR(ret);
 239         goto out;
 240 }
 241
 242 void crypto_alg_tested(const char *name, int err)
 243 {
 244         struct crypto_larval *test;
 245         struct crypto_alg *alg;
 246         struct crypto_alg *q;
 247         LIST_HEAD(list);
 248
 249         down_write(&crypto_alg_sem);
 250         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 251                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 252                         continue;
 253
 254                 test = (struct crypto_larval *)q;
 255
 256                 if (!strcmp(q->cra_driver_name, name))
 257                         goto found;
 258         }
 259
 260         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 261         goto unlock;
 262
 263 found:
 264         q->cra_flags |= CRYPTO_ALG_DEAD;
 265         alg = test->adult;
 266         if (err || list_empty(&alg->cra_list))
 267                 goto complete;
 268
 269         alg->cra_flags |= CRYPTO_ALG_TESTED;
 270
 271         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 272                 if (q == alg)
 273                         continue;
 274
 275                 if (crypto_is_moribund(q))
 276                         continue;
 277
 278                 if (crypto_is_larval(q)) {
 279                         struct crypto_larval *larval = (void *)q;
 280
 281                         /*
 282                          * Check to see if either our generic name or
 283                          * specific name can satisfy the name requested
 284                          * by the larval entry q.
 285                          */
 286                         if (strcmp(alg->cra_name, q->cra_name) &&
 287                             strcmp(alg->cra_driver_name, q->cra_name))
 288                                 continue;
 289
 290                         if (larval->adult)
 291                                 continue;
 292                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 293                                 continue;
 294                         if (!crypto_mod_get(alg))
 295                                 continue;
 296
 297                         larval->adult = alg;
 298                         complete_all(&larval->completion);
 299                         continue;
 300                 }
 301
 302                 if (strcmp(alg->cra_name, q->cra_name))
 303                         continue;
 304
 305                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 306                     q->cra_priority > alg->cra_priority)
 307                         continue;
 308
 309                 crypto_remove_spawns(q, &list, alg);
 310         }
 311
 312 complete:
 313         complete_all(&test->completion);
 314
 315 unlock:
 316         up_write(&crypto_alg_sem);
 317
 318         crypto_remove_final(&list);
 319 }
 320 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 321
 322 void crypto_remove_final(struct list_head *list)
 323 {
 324         struct crypto_alg *alg;
 325         struct crypto_alg *n;
 326
 327         list_for_each_entry_safe(alg, n, list, cra_list) {
 328                 list_del_init(&alg->cra_list);
 329                 crypto_alg_put(alg);
 330         }
 331 }
 332 EXPORT_SYMBOL_GPL(crypto_remove_final);
 333
 334 static void crypto_wait_for_test(struct crypto_larval *larval)
 335 {
 336         int err;
 337
 338         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 339         if (err != NOTIFY_STOP) {
 340                 if (WARN_ON(err != NOTIFY_DONE))
 341                         goto out;
 342                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 343         }
 344
 345         err = wait_for_completion_interruptible(&larval->completion);
 346         WARN_ON(err);
 347
 348 out:
 349         crypto_larval_kill(&larval->alg);
 350 }
 351
 352 int crypto_register_alg(struct crypto_alg *alg)
 353 {
 354         struct crypto_larval *larval;
 355         int err;
 356
 357         err = crypto_check_alg(alg);
 358         if (err)
 359                 return err;
 360
 361         down_write(&crypto_alg_sem);
 362         larval = __crypto_register_alg(alg);
 363         up_write(&crypto_alg_sem);
 364
 365         if (IS_ERR(larval))
 366                 return PTR_ERR(larval);
 367
 368         crypto_wait_for_test(larval);
 369         return 0;
 370 }
 371 EXPORT_SYMBOL_GPL(crypto_register_alg);
 372
 373 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 374 {
 375         if (unlikely(list_empty(&alg->cra_list)))
 376                 return -ENOENT;
 377
 378         alg->cra_flags |= CRYPTO_ALG_DEAD;
 379
 380         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 381         list_del_init(&alg->cra_list);
 382         crypto_remove_spawns(alg, list, NULL);
 383
 384         return 0;
 385 }
 386
 387 int crypto_unregister_alg(struct crypto_alg *alg)
 388 {
 389         int ret;
 390         LIST_HEAD(list);
 391
 392         down_write(&crypto_alg_sem);
 393         ret = crypto_remove_alg(alg, &list);
 394         up_write(&crypto_alg_sem);
 395
 396         if (ret)
 397                 return ret;
 398
 399         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 400         if (alg->cra_destroy)
 401                 alg->cra_destroy(alg);
 402
 403         crypto_remove_final(&list);
 404         return 0;
 405 }
 406 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 407
 408 int crypto_register_algs(struct crypto_alg *algs, int count)
 409 {
 410         int i, ret;
 411
 412         for (i = 0; i < count; i++) {
 413                 ret = crypto_register_alg(&algs[i]);
 414                 if (ret)
 415                         goto err;
 416         }
 417
 418         return 0;
 419
 420 err:
 421         for (--i; i >= 0; --i)
 422                 crypto_unregister_alg(&algs[i]);
 423
 424         return ret;
 425 }
 426 EXPORT_SYMBOL_GPL(crypto_register_algs);
 427
 428 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 429 {
 430         int i, ret;
 431
 432         for (i = 0; i < count; i++) {
 433                 ret = crypto_unregister_alg(&algs[i]);
 434                 if (ret)
 435                         pr_err("Failed to unregister %s %s: %d\n",
 436                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 437         }
 438
 439         return 0;
 440 }
 441 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 442
 443 int crypto_register_template(struct crypto_template *tmpl)
 444 {
 445         struct crypto_template *q;
 446         int err = -EEXIST;
 447
 448         down_write(&crypto_alg_sem);
 449
 450         list_for_each_entry(q, &crypto_template_list, list) {
 451                 if (q == tmpl)
 452                         goto out;
 453         }
 454
 455         list_add(&tmpl->list, &crypto_template_list);
 456         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 457         err = 0;
 458 out:
 459         up_write(&crypto_alg_sem);
 460         return err;
 461 }
 462 EXPORT_SYMBOL_GPL(crypto_register_template);
 463
 464 void crypto_unregister_template(struct crypto_template *tmpl)
 465 {
 466         struct crypto_instance *inst;
 467         struct hlist_node *p, *n;
 468         struct hlist_head *list;
 469         LIST_HEAD(users);
 470
 471         down_write(&crypto_alg_sem);
 472
 473         BUG_ON(list_empty(&tmpl->list));
 474         list_del_init(&tmpl->list);
 475
 476         list = &tmpl->instances;
 477         hlist_for_each_entry(inst, p, list, list) {
 478                 int err = crypto_remove_alg(&inst->alg, &users);
 479                 BUG_ON(err);
 480         }
 481
 482         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 483
 484         up_write(&crypto_alg_sem);
 485
 486         hlist_for_each_entry_safe(inst, p, n, list, list) {
 487                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 488                 tmpl->free(inst);
 489         }
 490         crypto_remove_final(&users);
 491 }
 492 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 493
 494 static struct crypto_template *__crypto_lookup_template(const char *name)
 495 {
 496         struct crypto_template *q, *tmpl = NULL;
 497
 498         down_read(&crypto_alg_sem);
 499         list_for_each_entry(q, &crypto_template_list, list) {
 500                 if (strcmp(q->name, name))
 501                         continue;
 502                 if (unlikely(!crypto_tmpl_get(q)))
 503                         continue;
 504
 505                 tmpl = q;
 506                 break;
 507         }
 508         up_read(&crypto_alg_sem);
 509
 510         return tmpl;
 511 }
 512
 513 struct crypto_template *crypto_lookup_template(const char *name)
 514 {
 515         return try_then_request_module(__crypto_lookup_template(name), "%s",
 516                                        name);
 517 }
 518 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 519
 520 int crypto_register_instance(struct crypto_template *tmpl,
 521                              struct crypto_instance *inst)
 522 {
 523         struct crypto_larval *larval;
 524         int err;
 525
 526         err = crypto_check_alg(&inst->alg);
 527         if (err)
 528                 goto err;
 529
 530         inst->alg.cra_module = tmpl->module;
 531         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 532
 533         down_write(&crypto_alg_sem);
 534
 535         larval = __crypto_register_alg(&inst->alg);
 536         if (IS_ERR(larval))
 537                 goto unlock;
 538
 539         hlist_add_head(&inst->list, &tmpl->instances);
 540         inst->tmpl = tmpl;
 541
 542 unlock:
 543         up_write(&crypto_alg_sem);
 544
 545         err = PTR_ERR(larval);
 546         if (IS_ERR(larval))
 547                 goto err;
 548
 549         crypto_wait_for_test(larval);
 550         err = 0;
 551
 552 err:
 553         return err;
 554 }
 555 EXPORT_SYMBOL_GPL(crypto_register_instance);
 556
 557 int crypto_unregister_instance(struct crypto_alg *alg)
 558 {
 559         int err;
 560         struct crypto_instance *inst = (void *)alg;
 561         struct crypto_template *tmpl = inst->tmpl;
 562         LIST_HEAD(users);
 563
 564         if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
 565                 return -EINVAL;
 566
 567         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 568
 569         down_write(&crypto_alg_sem);
 570
 571         hlist_del_init(&inst->list);
 572         err = crypto_remove_alg(alg, &users);
 573
 574         up_write(&crypto_alg_sem);
 575
 576         if (err)
 577                 return err;
 578
 579         tmpl->free(inst);
 580         crypto_remove_final(&users);
 581
 582         return 0;
 583 }
 584 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 585
 586 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 587                       struct crypto_instance *inst, u32 mask)
 588 {
 589         int err = -EAGAIN;
 590
 591         spawn->inst = inst;
 592         spawn->mask = mask;
 593
 594         down_write(&crypto_alg_sem);
 595         if (!crypto_is_moribund(alg)) {
 596                 list_add(&spawn->list, &alg->cra_users);
 597                 spawn->alg = alg;
 598                 err = 0;
 599         }
 600         up_write(&crypto_alg_sem);
 601
 602         return err;
 603 }
 604 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 605
 606 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 607                        struct crypto_instance *inst,
 608                        const struct crypto_type *frontend)
 609 {
 610         int err = -EINVAL;
 611
 612         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 613                 goto out;
 614
 615         spawn->frontend = frontend;
 616         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 617
 618 out:
 619         return err;
 620 }
 621 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 622
 623 void crypto_drop_spawn(struct crypto_spawn *spawn)
 624 {
 625         if (!spawn->alg)
 626                 return;
 627
 628         down_write(&crypto_alg_sem);
 629         list_del(&spawn->list);
 630         up_write(&crypto_alg_sem);
 631 }
 632 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 633
 634 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 635 {
 636         struct crypto_alg *alg;
 637         struct crypto_alg *alg2;
 638
 639         down_read(&crypto_alg_sem);
 640         alg = spawn->alg;
 641         alg2 = alg;
 642         if (alg2)
 643                 alg2 = crypto_mod_get(alg2);
 644         up_read(&crypto_alg_sem);
 645
 646         if (!alg2) {
 647                 if (alg)
 648                         crypto_shoot_alg(alg);
 649                 return ERR_PTR(-EAGAIN);
 650         }
 651
 652         return alg;
 653 }
 654
 655 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 656                                     u32 mask)
 657 {
 658         struct crypto_alg *alg;
 659         struct crypto_tfm *tfm;
 660
 661         alg = crypto_spawn_alg(spawn);
 662         if (IS_ERR(alg))
 663                 return ERR_CAST(alg);
 664
 665         tfm = ERR_PTR(-EINVAL);
 666         if (unlikely((alg->cra_flags ^ type) & mask))
 667                 goto out_put_alg;
 668
 669         tfm = __crypto_alloc_tfm(alg, type, mask);
 670         if (IS_ERR(tfm))
 671                 goto out_put_alg;
 672
 673         return tfm;
 674
 675 out_put_alg:
 676         crypto_mod_put(alg);
 677         return tfm;
 678 }
 679 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 680
 681 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 682 {
 683         struct crypto_alg *alg;
 684         struct crypto_tfm *tfm;
 685
 686         alg = crypto_spawn_alg(spawn);
 687         if (IS_ERR(alg))
 688                 return ERR_CAST(alg);
 689
 690         tfm = crypto_create_tfm(alg, spawn->frontend);
 691         if (IS_ERR(tfm))
 692                 goto out_put_alg;
 693
 694         return tfm;
 695
 696 out_put_alg:
 697         crypto_mod_put(alg);
 698         return tfm;
 699 }
 700 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 701
 702 int crypto_register_notifier(struct notifier_block *nb)
 703 {
 704         return blocking_notifier_chain_register(&crypto_chain, nb);
 705 }
 706 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 707
 708 int crypto_unregister_notifier(struct notifier_block *nb)
 709 {
 710         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 711 }
 712 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 713
 714 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 715 {
 716         struct rtattr *rta = tb[0];
 717         struct crypto_attr_type *algt;
 718
 719         if (!rta)
 720                 return ERR_PTR(-ENOENT);
 721         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 722                 return ERR_PTR(-EINVAL);
 723         if (rta->rta_type != CRYPTOA_TYPE)
 724                 return ERR_PTR(-EINVAL);
 725
 726         algt = RTA_DATA(rta);
 727
 728         return algt;
 729 }
 730 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 731
 732 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 733 {
 734         struct crypto_attr_type *algt;
 735
 736         algt = crypto_get_attr_type(tb);
 737         if (IS_ERR(algt))
 738                 return PTR_ERR(algt);
 739
 740         if ((algt->type ^ type) & algt->mask)
 741                 return -EINVAL;
 742
 743         return 0;
 744 }
 745 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 746
 747 const char *crypto_attr_alg_name(struct rtattr *rta)
 748 {
 749         struct crypto_attr_alg *alga;
 750
 751         if (!rta)
 752                 return ERR_PTR(-ENOENT);
 753         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 754                 return ERR_PTR(-EINVAL);
 755         if (rta->rta_type != CRYPTOA_ALG)
 756                 return ERR_PTR(-EINVAL);
 757
 758         alga = RTA_DATA(rta);
 759         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 760
 761         return alga->name;
 762 }
 763 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 764
 765 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 766                                     const struct crypto_type *frontend,
 767                                     u32 type, u32 mask)
 768 {
 769         const char *name;
 770         int err;
 771
 772         name = crypto_attr_alg_name(rta);
 773         err = PTR_ERR(name);
 774         if (IS_ERR(name))
 775                 return ERR_PTR(err);
 776
 777         return crypto_find_alg(name, frontend, type, mask);
 778 }
 779 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 780
 781 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 782 {
 783         struct crypto_attr_u32 *nu32;
 784
 785         if (!rta)
 786                 return -ENOENT;
 787         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 788                 return -EINVAL;
 789         if (rta->rta_type != CRYPTOA_U32)
 790                 return -EINVAL;
 791
 792         nu32 = RTA_DATA(rta);
 793         *num = nu32->num;
 794
 795         return 0;
 796 }
 797 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 798
 799 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 800                              unsigned int head)
 801 {
 802         struct crypto_instance *inst;
 803         char *p;
 804         int err;
 805
 806         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 807                     GFP_KERNEL);
 808         if (!p)
 809                 return ERR_PTR(-ENOMEM);
 810
 811         inst = (void *)(p + head);
 812
 813         err = -ENAMETOOLONG;
 814         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 815                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 816                 goto err_free_inst;
 817
 818         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 819                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 820                 goto err_free_inst;
 821
 822         return p;
 823
 824 err_free_inst:
 825         kfree(p);
 826         return ERR_PTR(err);
 827 }
 828 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 829
 830 struct crypto_instance *crypto_alloc_instance(const char *name,
 831                                               struct crypto_alg *alg)
 832 {
 833         struct crypto_instance *inst;
 834         struct crypto_spawn *spawn;
 835         int err;
 836
 837         inst = crypto_alloc_instance2(name, alg, 0);
 838         if (IS_ERR(inst))
 839                 goto out;
 840
 841         spawn = crypto_instance_ctx(inst);
 842         err = crypto_init_spawn(spawn, alg, inst,
 843                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 844
 845         if (err)
 846                 goto err_free_inst;
 847
 848         return inst;
 849
 850 err_free_inst:
 851         kfree(inst);
 852         inst = ERR_PTR(err);
 853
 854 out:
 855         return inst;
 856 }
 857 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 858
 859 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 860 {
 861         INIT_LIST_HEAD(&queue->list);
 862         queue->backlog = &queue->list;
 863         queue->qlen = 0;
 864         queue->max_qlen = max_qlen;
 865 }
 866 EXPORT_SYMBOL_GPL(crypto_init_queue);
 867
 868 int crypto_enqueue_request(struct crypto_queue *queue,
 869                            struct crypto_async_request *request)
 870 {
 871         int err = -EINPROGRESS;
 872
 873         if (unlikely(queue->qlen >= queue->max_qlen)) {
 874                 err = -EBUSY;
 875                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 876                         goto out;
 877                 if (queue->backlog == &queue->list)
 878                         queue->backlog = &request->list;
 879         }
 880
 881         queue->qlen++;
 882         list_add_tail(&request->list, &queue->list);
 883
 884 out:
 885         return err;
 886 }
 887 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 888
 889 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 890 {
 891         struct list_head *request;
 892
 893         if (unlikely(!queue->qlen))
 894                 return NULL;
 895
 896         queue->qlen--;
 897
 898         if (queue->backlog != &queue->list)
 899                 queue->backlog = queue->backlog->next;
 900
 901         request = queue->list.next;
 902         list_del(request);
 903
 904         return (char *)list_entry(request, struct crypto_async_request, list) -
 905                offset;
 906 }
 907 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 908
 909 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 910 {
 911         return __crypto_dequeue_request(queue, 0);
 912 }
 913 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 914
 915 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 916 {
 917         struct crypto_async_request *req;
 918
 919         list_for_each_entry(req, &queue->list, list) {
 920                 if (req->tfm == tfm)
 921                         return 1;
 922         }
 923
 924         return 0;
 925 }
 926 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 927
 928 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 929 {
 930         u8 *b = (a + size);
 931         u8 c;
 932
 933         for (; size; size--) {
 934                 c = *--b + 1;
 935                 *b = c;
 936                 if (c)
 937                         break;
 938         }
 939 }
 940
 941 void crypto_inc(u8 *a, unsigned int size)
 942 {
 943         __be32 *b = (__be32 *)(a + size);
 944         u32 c;
 945
 946         for (; size >= 4; size -= 4) {
 947                 c = be32_to_cpu(*--b) + 1;
 948                 *b = cpu_to_be32(c);
 949                 if (c)
 950                         return;
 951         }
 952
 953         crypto_inc_byte(a, size);
 954 }
 955 EXPORT_SYMBOL_GPL(crypto_inc);
 956
 957 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 958 {
 959         for (; size; size--)
 960                 *a++ ^= *b++;
 961 }
 962
 963 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 964 {
 965         u32 *a = (u32 *)dst;
 966         u32 *b = (u32 *)src;
 967
 968         for (; size >= 4; size -= 4)
 969                 *a++ ^= *b++;
 970
 971         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 972 }
 973 EXPORT_SYMBOL_GPL(crypto_xor);
 974
 975 static int __init crypto_algapi_init(void)
 976 {
 977         crypto_init_proc();
 978         return 0;
 979 }
 980
 981 static void __exit crypto_algapi_exit(void)
 982 {
 983         crypto_exit_proc();
 984 }
 985
 986 module_init(crypto_algapi_init);
 987 module_exit(crypto_algapi_exit);
 988
 989 MODULE_LICENSE("GPL");
 990 MODULE_DESCRIPTION("Cryptographic algorithms API");