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_killable(&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         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 358         err = crypto_check_alg(alg);
 359         if (err)
 360                 return err;
 361
 362         down_write(&crypto_alg_sem);
 363         larval = __crypto_register_alg(alg);
 364         up_write(&crypto_alg_sem);
 365
 366         if (IS_ERR(larval))
 367                 return PTR_ERR(larval);
 368
 369         crypto_wait_for_test(larval);
 370         return 0;
 371 }
 372 EXPORT_SYMBOL_GPL(crypto_register_alg);
 373
 374 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 375 {
 376         if (unlikely(list_empty(&alg->cra_list)))
 377                 return -ENOENT;
 378
 379         alg->cra_flags |= CRYPTO_ALG_DEAD;
 380
 381         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 382         list_del_init(&alg->cra_list);
 383         crypto_remove_spawns(alg, list, NULL);
 384
 385         return 0;
 386 }
 387
 388 int crypto_unregister_alg(struct crypto_alg *alg)
 389 {
 390         int ret;
 391         LIST_HEAD(list);
 392
 393         down_write(&crypto_alg_sem);
 394         ret = crypto_remove_alg(alg, &list);
 395         up_write(&crypto_alg_sem);
 396
 397         if (ret)
 398                 return ret;
 399
 400         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 401         if (alg->cra_destroy)
 402                 alg->cra_destroy(alg);
 403
 404         crypto_remove_final(&list);
 405         return 0;
 406 }
 407 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 408
 409 int crypto_register_template(struct crypto_template *tmpl)
 410 {
 411         struct crypto_template *q;
 412         int err = -EEXIST;
 413
 414         down_write(&crypto_alg_sem);
 415
 416         list_for_each_entry(q, &crypto_template_list, list) {
 417                 if (q == tmpl)
 418                         goto out;
 419         }
 420
 421         list_add(&tmpl->list, &crypto_template_list);
 422         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 423         err = 0;
 424 out:
 425         up_write(&crypto_alg_sem);
 426         return err;
 427 }
 428 EXPORT_SYMBOL_GPL(crypto_register_template);
 429
 430 void crypto_unregister_template(struct crypto_template *tmpl)
 431 {
 432         struct crypto_instance *inst;
 433         struct hlist_node *p, *n;
 434         struct hlist_head *list;
 435         LIST_HEAD(users);
 436
 437         down_write(&crypto_alg_sem);
 438
 439         BUG_ON(list_empty(&tmpl->list));
 440         list_del_init(&tmpl->list);
 441
 442         list = &tmpl->instances;
 443         hlist_for_each_entry(inst, p, list, list) {
 444                 int err = crypto_remove_alg(&inst->alg, &users);
 445                 BUG_ON(err);
 446         }
 447
 448         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 449
 450         up_write(&crypto_alg_sem);
 451
 452         hlist_for_each_entry_safe(inst, p, n, list, list) {
 453                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 454                 tmpl->free(inst);
 455         }
 456         crypto_remove_final(&users);
 457 }
 458 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 459
 460 static struct crypto_template *__crypto_lookup_template(const char *name)
 461 {
 462         struct crypto_template *q, *tmpl = NULL;
 463
 464         down_read(&crypto_alg_sem);
 465         list_for_each_entry(q, &crypto_template_list, list) {
 466                 if (strcmp(q->name, name))
 467                         continue;
 468                 if (unlikely(!crypto_tmpl_get(q)))
 469                         continue;
 470
 471                 tmpl = q;
 472                 break;
 473         }
 474         up_read(&crypto_alg_sem);
 475
 476         return tmpl;
 477 }
 478
 479 struct crypto_template *crypto_lookup_template(const char *name)
 480 {
 481         return try_then_request_module(__crypto_lookup_template(name),
 482                                        "crypto-%s", name);
 483 }
 484 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 485
 486 int crypto_register_instance(struct crypto_template *tmpl,
 487                              struct crypto_instance *inst)
 488 {
 489         struct crypto_larval *larval;
 490         int err;
 491
 492         err = crypto_check_alg(&inst->alg);
 493         if (err)
 494                 goto err;
 495
 496         inst->alg.cra_module = tmpl->module;
 497         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 498
 499         down_write(&crypto_alg_sem);
 500
 501         larval = __crypto_register_alg(&inst->alg);
 502         if (IS_ERR(larval))
 503                 goto unlock;
 504
 505         hlist_add_head(&inst->list, &tmpl->instances);
 506         inst->tmpl = tmpl;
 507
 508 unlock:
 509         up_write(&crypto_alg_sem);
 510
 511         err = PTR_ERR(larval);
 512         if (IS_ERR(larval))
 513                 goto err;
 514
 515         crypto_wait_for_test(larval);
 516         err = 0;
 517
 518 err:
 519         return err;
 520 }
 521 EXPORT_SYMBOL_GPL(crypto_register_instance);
 522
 523 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 524                       struct crypto_instance *inst, u32 mask)
 525 {
 526         int err = -EAGAIN;
 527
 528         spawn->inst = inst;
 529         spawn->mask = mask;
 530
 531         down_write(&crypto_alg_sem);
 532         if (!crypto_is_moribund(alg)) {
 533                 list_add(&spawn->list, &alg->cra_users);
 534                 spawn->alg = alg;
 535                 err = 0;
 536         }
 537         up_write(&crypto_alg_sem);
 538
 539         return err;
 540 }
 541 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 542
 543 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 544                        struct crypto_instance *inst,
 545                        const struct crypto_type *frontend)
 546 {
 547         int err = -EINVAL;
 548
 549         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 550                 goto out;
 551
 552         spawn->frontend = frontend;
 553         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 554
 555 out:
 556         return err;
 557 }
 558 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 559
 560 void crypto_drop_spawn(struct crypto_spawn *spawn)
 561 {
 562         if (!spawn->alg)
 563                 return;
 564
 565         down_write(&crypto_alg_sem);
 566         list_del(&spawn->list);
 567         up_write(&crypto_alg_sem);
 568 }
 569 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 570
 571 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 572 {
 573         struct crypto_alg *alg;
 574         struct crypto_alg *alg2;
 575
 576         down_read(&crypto_alg_sem);
 577         alg = spawn->alg;
 578         alg2 = alg;
 579         if (alg2)
 580                 alg2 = crypto_mod_get(alg2);
 581         up_read(&crypto_alg_sem);
 582
 583         if (!alg2) {
 584                 if (alg)
 585                         crypto_shoot_alg(alg);
 586                 return ERR_PTR(-EAGAIN);
 587         }
 588
 589         return alg;
 590 }
 591
 592 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 593                                     u32 mask)
 594 {
 595         struct crypto_alg *alg;
 596         struct crypto_tfm *tfm;
 597
 598         alg = crypto_spawn_alg(spawn);
 599         if (IS_ERR(alg))
 600                 return ERR_CAST(alg);
 601
 602         tfm = ERR_PTR(-EINVAL);
 603         if (unlikely((alg->cra_flags ^ type) & mask))
 604                 goto out_put_alg;
 605
 606         tfm = __crypto_alloc_tfm(alg, type, mask);
 607         if (IS_ERR(tfm))
 608                 goto out_put_alg;
 609
 610         return tfm;
 611
 612 out_put_alg:
 613         crypto_mod_put(alg);
 614         return tfm;
 615 }
 616 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 617
 618 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 619 {
 620         struct crypto_alg *alg;
 621         struct crypto_tfm *tfm;
 622
 623         alg = crypto_spawn_alg(spawn);
 624         if (IS_ERR(alg))
 625                 return ERR_CAST(alg);
 626
 627         tfm = crypto_create_tfm(alg, spawn->frontend);
 628         if (IS_ERR(tfm))
 629                 goto out_put_alg;
 630
 631         return tfm;
 632
 633 out_put_alg:
 634         crypto_mod_put(alg);
 635         return tfm;
 636 }
 637 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 638
 639 int crypto_register_notifier(struct notifier_block *nb)
 640 {
 641         return blocking_notifier_chain_register(&crypto_chain, nb);
 642 }
 643 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 644
 645 int crypto_unregister_notifier(struct notifier_block *nb)
 646 {
 647         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 648 }
 649 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 650
 651 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 652 {
 653         struct rtattr *rta = tb[0];
 654         struct crypto_attr_type *algt;
 655
 656         if (!rta)
 657                 return ERR_PTR(-ENOENT);
 658         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 659                 return ERR_PTR(-EINVAL);
 660         if (rta->rta_type != CRYPTOA_TYPE)
 661                 return ERR_PTR(-EINVAL);
 662
 663         algt = RTA_DATA(rta);
 664
 665         return algt;
 666 }
 667 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 668
 669 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 670 {
 671         struct crypto_attr_type *algt;
 672
 673         algt = crypto_get_attr_type(tb);
 674         if (IS_ERR(algt))
 675                 return PTR_ERR(algt);
 676
 677         if ((algt->type ^ type) & algt->mask)
 678                 return -EINVAL;
 679
 680         return 0;
 681 }
 682 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 683
 684 const char *crypto_attr_alg_name(struct rtattr *rta)
 685 {
 686         struct crypto_attr_alg *alga;
 687
 688         if (!rta)
 689                 return ERR_PTR(-ENOENT);
 690         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 691                 return ERR_PTR(-EINVAL);
 692         if (rta->rta_type != CRYPTOA_ALG)
 693                 return ERR_PTR(-EINVAL);
 694
 695         alga = RTA_DATA(rta);
 696         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 697
 698         return alga->name;
 699 }
 700 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 701
 702 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 703                                     const struct crypto_type *frontend,
 704                                     u32 type, u32 mask)
 705 {
 706         const char *name;
 707         int err;
 708
 709         name = crypto_attr_alg_name(rta);
 710         err = PTR_ERR(name);
 711         if (IS_ERR(name))
 712                 return ERR_PTR(err);
 713
 714         return crypto_find_alg(name, frontend, type, mask);
 715 }
 716 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 717
 718 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 719 {
 720         struct crypto_attr_u32 *nu32;
 721
 722         if (!rta)
 723                 return -ENOENT;
 724         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 725                 return -EINVAL;
 726         if (rta->rta_type != CRYPTOA_U32)
 727                 return -EINVAL;
 728
 729         nu32 = RTA_DATA(rta);
 730         *num = nu32->num;
 731
 732         return 0;
 733 }
 734 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 735
 736 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 737                              unsigned int head)
 738 {
 739         struct crypto_instance *inst;
 740         char *p;
 741         int err;
 742
 743         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 744                     GFP_KERNEL);
 745         if (!p)
 746                 return ERR_PTR(-ENOMEM);
 747
 748         inst = (void *)(p + head);
 749
 750         err = -ENAMETOOLONG;
 751         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 752                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 753                 goto err_free_inst;
 754
 755         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 756                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 757                 goto err_free_inst;
 758
 759         return p;
 760
 761 err_free_inst:
 762         kfree(p);
 763         return ERR_PTR(err);
 764 }
 765 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 766
 767 struct crypto_instance *crypto_alloc_instance(const char *name,
 768                                               struct crypto_alg *alg)
 769 {
 770         struct crypto_instance *inst;
 771         struct crypto_spawn *spawn;
 772         int err;
 773
 774         inst = crypto_alloc_instance2(name, alg, 0);
 775         if (IS_ERR(inst))
 776                 goto out;
 777
 778         spawn = crypto_instance_ctx(inst);
 779         err = crypto_init_spawn(spawn, alg, inst,
 780                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 781
 782         if (err)
 783                 goto err_free_inst;
 784
 785         return inst;
 786
 787 err_free_inst:
 788         kfree(inst);
 789         inst = ERR_PTR(err);
 790
 791 out:
 792         return inst;
 793 }
 794 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 795
 796 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 797 {
 798         INIT_LIST_HEAD(&queue->list);
 799         queue->backlog = &queue->list;
 800         queue->qlen = 0;
 801         queue->max_qlen = max_qlen;
 802 }
 803 EXPORT_SYMBOL_GPL(crypto_init_queue);
 804
 805 int crypto_enqueue_request(struct crypto_queue *queue,
 806                            struct crypto_async_request *request)
 807 {
 808         int err = -EINPROGRESS;
 809
 810         if (unlikely(queue->qlen >= queue->max_qlen)) {
 811                 err = -EBUSY;
 812                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 813                         goto out;
 814                 if (queue->backlog == &queue->list)
 815                         queue->backlog = &request->list;
 816         }
 817
 818         queue->qlen++;
 819         list_add_tail(&request->list, &queue->list);
 820
 821 out:
 822         return err;
 823 }
 824 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 825
 826 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 827 {
 828         struct list_head *request;
 829
 830         if (unlikely(!queue->qlen))
 831                 return NULL;
 832
 833         queue->qlen--;
 834
 835         if (queue->backlog != &queue->list)
 836                 queue->backlog = queue->backlog->next;
 837
 838         request = queue->list.next;
 839         list_del(request);
 840
 841         return (char *)list_entry(request, struct crypto_async_request, list) -
 842                offset;
 843 }
 844 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 845
 846 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 847 {
 848         return __crypto_dequeue_request(queue, 0);
 849 }
 850 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 851
 852 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 853 {
 854         struct crypto_async_request *req;
 855
 856         list_for_each_entry(req, &queue->list, list) {
 857                 if (req->tfm == tfm)
 858                         return 1;
 859         }
 860
 861         return 0;
 862 }
 863 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 864
 865 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 866 {
 867         u8 *b = (a + size);
 868         u8 c;
 869
 870         for (; size; size--) {
 871                 c = *--b + 1;
 872                 *b = c;
 873                 if (c)
 874                         break;
 875         }
 876 }
 877
 878 void crypto_inc(u8 *a, unsigned int size)
 879 {
 880         __be32 *b = (__be32 *)(a + size);
 881         u32 c;
 882
 883         for (; size >= 4; size -= 4) {
 884                 c = be32_to_cpu(*--b) + 1;
 885                 *b = cpu_to_be32(c);
 886                 if (c)
 887                         return;
 888         }
 889
 890         crypto_inc_byte(a, size);
 891 }
 892 EXPORT_SYMBOL_GPL(crypto_inc);
 893
 894 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 895 {
 896         for (; size; size--)
 897                 *a++ ^= *b++;
 898 }
 899
 900 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 901 {
 902         u32 *a = (u32 *)dst;
 903         u32 *b = (u32 *)src;
 904
 905         for (; size >= 4; size -= 4)
 906                 *a++ ^= *b++;
 907
 908         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 909 }
 910 EXPORT_SYMBOL_GPL(crypto_xor);
 911
 912 static int __init crypto_algapi_init(void)
 913 {
 914         crypto_init_proc();
 915         return 0;
 916 }
 917
 918 static void __exit crypto_algapi_exit(void)
 919 {
 920         crypto_exit_proc();
 921 }
 922
 923 module_init(crypto_algapi_init);
 924 module_exit(crypto_algapi_exit);
 925
 926 MODULE_LICENSE("GPL");
 927 MODULE_DESCRIPTION("Cryptographic algorithms API");