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), name);
 516 }
 517 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 518
 519 int crypto_register_instance(struct crypto_template *tmpl,
 520                              struct crypto_instance *inst)
 521 {
 522         struct crypto_larval *larval;
 523         int err;
 524
 525         err = crypto_check_alg(&inst->alg);
 526         if (err)
 527                 goto err;
 528
 529         inst->alg.cra_module = tmpl->module;
 530         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 531
 532         down_write(&crypto_alg_sem);
 533
 534         larval = __crypto_register_alg(&inst->alg);
 535         if (IS_ERR(larval))
 536                 goto unlock;
 537
 538         hlist_add_head(&inst->list, &tmpl->instances);
 539         inst->tmpl = tmpl;
 540
 541 unlock:
 542         up_write(&crypto_alg_sem);
 543
 544         err = PTR_ERR(larval);
 545         if (IS_ERR(larval))
 546                 goto err;
 547
 548         crypto_wait_for_test(larval);
 549         err = 0;
 550
 551 err:
 552         return err;
 553 }
 554 EXPORT_SYMBOL_GPL(crypto_register_instance);
 555
 556 int crypto_unregister_instance(struct crypto_alg *alg)
 557 {
 558         int err;
 559         struct crypto_instance *inst = (void *)alg;
 560         struct crypto_template *tmpl = inst->tmpl;
 561         LIST_HEAD(users);
 562
 563         if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
 564                 return -EINVAL;
 565
 566         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 567
 568         down_write(&crypto_alg_sem);
 569
 570         hlist_del_init(&inst->list);
 571         err = crypto_remove_alg(alg, &users);
 572
 573         up_write(&crypto_alg_sem);
 574
 575         if (err)
 576                 return err;
 577
 578         tmpl->free(inst);
 579         crypto_remove_final(&users);
 580
 581         return 0;
 582 }
 583 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 584
 585 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 586                       struct crypto_instance *inst, u32 mask)
 587 {
 588         int err = -EAGAIN;
 589
 590         spawn->inst = inst;
 591         spawn->mask = mask;
 592
 593         down_write(&crypto_alg_sem);
 594         if (!crypto_is_moribund(alg)) {
 595                 list_add(&spawn->list, &alg->cra_users);
 596                 spawn->alg = alg;
 597                 err = 0;
 598         }
 599         up_write(&crypto_alg_sem);
 600
 601         return err;
 602 }
 603 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 604
 605 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 606                        struct crypto_instance *inst,
 607                        const struct crypto_type *frontend)
 608 {
 609         int err = -EINVAL;
 610
 611         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 612                 goto out;
 613
 614         spawn->frontend = frontend;
 615         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 616
 617 out:
 618         return err;
 619 }
 620 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 621
 622 void crypto_drop_spawn(struct crypto_spawn *spawn)
 623 {
 624         if (!spawn->alg)
 625                 return;
 626
 627         down_write(&crypto_alg_sem);
 628         list_del(&spawn->list);
 629         up_write(&crypto_alg_sem);
 630 }
 631 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 632
 633 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 634 {
 635         struct crypto_alg *alg;
 636         struct crypto_alg *alg2;
 637
 638         down_read(&crypto_alg_sem);
 639         alg = spawn->alg;
 640         alg2 = alg;
 641         if (alg2)
 642                 alg2 = crypto_mod_get(alg2);
 643         up_read(&crypto_alg_sem);
 644
 645         if (!alg2) {
 646                 if (alg)
 647                         crypto_shoot_alg(alg);
 648                 return ERR_PTR(-EAGAIN);
 649         }
 650
 651         return alg;
 652 }
 653
 654 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 655                                     u32 mask)
 656 {
 657         struct crypto_alg *alg;
 658         struct crypto_tfm *tfm;
 659
 660         alg = crypto_spawn_alg(spawn);
 661         if (IS_ERR(alg))
 662                 return ERR_CAST(alg);
 663
 664         tfm = ERR_PTR(-EINVAL);
 665         if (unlikely((alg->cra_flags ^ type) & mask))
 666                 goto out_put_alg;
 667
 668         tfm = __crypto_alloc_tfm(alg, type, mask);
 669         if (IS_ERR(tfm))
 670                 goto out_put_alg;
 671
 672         return tfm;
 673
 674 out_put_alg:
 675         crypto_mod_put(alg);
 676         return tfm;
 677 }
 678 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 679
 680 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 681 {
 682         struct crypto_alg *alg;
 683         struct crypto_tfm *tfm;
 684
 685         alg = crypto_spawn_alg(spawn);
 686         if (IS_ERR(alg))
 687                 return ERR_CAST(alg);
 688
 689         tfm = crypto_create_tfm(alg, spawn->frontend);
 690         if (IS_ERR(tfm))
 691                 goto out_put_alg;
 692
 693         return tfm;
 694
 695 out_put_alg:
 696         crypto_mod_put(alg);
 697         return tfm;
 698 }
 699 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 700
 701 int crypto_register_notifier(struct notifier_block *nb)
 702 {
 703         return blocking_notifier_chain_register(&crypto_chain, nb);
 704 }
 705 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 706
 707 int crypto_unregister_notifier(struct notifier_block *nb)
 708 {
 709         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 710 }
 711 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 712
 713 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 714 {
 715         struct rtattr *rta = tb[0];
 716         struct crypto_attr_type *algt;
 717
 718         if (!rta)
 719                 return ERR_PTR(-ENOENT);
 720         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 721                 return ERR_PTR(-EINVAL);
 722         if (rta->rta_type != CRYPTOA_TYPE)
 723                 return ERR_PTR(-EINVAL);
 724
 725         algt = RTA_DATA(rta);
 726
 727         return algt;
 728 }
 729 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 730
 731 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 732 {
 733         struct crypto_attr_type *algt;
 734
 735         algt = crypto_get_attr_type(tb);
 736         if (IS_ERR(algt))
 737                 return PTR_ERR(algt);
 738
 739         if ((algt->type ^ type) & algt->mask)
 740                 return -EINVAL;
 741
 742         return 0;
 743 }
 744 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 745
 746 const char *crypto_attr_alg_name(struct rtattr *rta)
 747 {
 748         struct crypto_attr_alg *alga;
 749
 750         if (!rta)
 751                 return ERR_PTR(-ENOENT);
 752         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 753                 return ERR_PTR(-EINVAL);
 754         if (rta->rta_type != CRYPTOA_ALG)
 755                 return ERR_PTR(-EINVAL);
 756
 757         alga = RTA_DATA(rta);
 758         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 759
 760         return alga->name;
 761 }
 762 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 763
 764 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 765                                     const struct crypto_type *frontend,
 766                                     u32 type, u32 mask)
 767 {
 768         const char *name;
 769         int err;
 770
 771         name = crypto_attr_alg_name(rta);
 772         err = PTR_ERR(name);
 773         if (IS_ERR(name))
 774                 return ERR_PTR(err);
 775
 776         return crypto_find_alg(name, frontend, type, mask);
 777 }
 778 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 779
 780 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 781 {
 782         struct crypto_attr_u32 *nu32;
 783
 784         if (!rta)
 785                 return -ENOENT;
 786         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 787                 return -EINVAL;
 788         if (rta->rta_type != CRYPTOA_U32)
 789                 return -EINVAL;
 790
 791         nu32 = RTA_DATA(rta);
 792         *num = nu32->num;
 793
 794         return 0;
 795 }
 796 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 797
 798 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 799                              unsigned int head)
 800 {
 801         struct crypto_instance *inst;
 802         char *p;
 803         int err;
 804
 805         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 806                     GFP_KERNEL);
 807         if (!p)
 808                 return ERR_PTR(-ENOMEM);
 809
 810         inst = (void *)(p + head);
 811
 812         err = -ENAMETOOLONG;
 813         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 814                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 815                 goto err_free_inst;
 816
 817         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 818                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 819                 goto err_free_inst;
 820
 821         return p;
 822
 823 err_free_inst:
 824         kfree(p);
 825         return ERR_PTR(err);
 826 }
 827 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 828
 829 struct crypto_instance *crypto_alloc_instance(const char *name,
 830                                               struct crypto_alg *alg)
 831 {
 832         struct crypto_instance *inst;
 833         struct crypto_spawn *spawn;
 834         int err;
 835
 836         inst = crypto_alloc_instance2(name, alg, 0);
 837         if (IS_ERR(inst))
 838                 goto out;
 839
 840         spawn = crypto_instance_ctx(inst);
 841         err = crypto_init_spawn(spawn, alg, inst,
 842                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 843
 844         if (err)
 845                 goto err_free_inst;
 846
 847         return inst;
 848
 849 err_free_inst:
 850         kfree(inst);
 851         inst = ERR_PTR(err);
 852
 853 out:
 854         return inst;
 855 }
 856 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 857
 858 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 859 {
 860         INIT_LIST_HEAD(&queue->list);
 861         queue->backlog = &queue->list;
 862         queue->qlen = 0;
 863         queue->max_qlen = max_qlen;
 864 }
 865 EXPORT_SYMBOL_GPL(crypto_init_queue);
 866
 867 int crypto_enqueue_request(struct crypto_queue *queue,
 868                            struct crypto_async_request *request)
 869 {
 870         int err = -EINPROGRESS;
 871
 872         if (unlikely(queue->qlen >= queue->max_qlen)) {
 873                 err = -EBUSY;
 874                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 875                         goto out;
 876                 if (queue->backlog == &queue->list)
 877                         queue->backlog = &request->list;
 878         }
 879
 880         queue->qlen++;
 881         list_add_tail(&request->list, &queue->list);
 882
 883 out:
 884         return err;
 885 }
 886 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 887
 888 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 889 {
 890         struct list_head *request;
 891
 892         if (unlikely(!queue->qlen))
 893                 return NULL;
 894
 895         queue->qlen--;
 896
 897         if (queue->backlog != &queue->list)
 898                 queue->backlog = queue->backlog->next;
 899
 900         request = queue->list.next;
 901         list_del(request);
 902
 903         return (char *)list_entry(request, struct crypto_async_request, list) -
 904                offset;
 905 }
 906 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 907
 908 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 909 {
 910         return __crypto_dequeue_request(queue, 0);
 911 }
 912 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 913
 914 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 915 {
 916         struct crypto_async_request *req;
 917
 918         list_for_each_entry(req, &queue->list, list) {
 919                 if (req->tfm == tfm)
 920                         return 1;
 921         }
 922
 923         return 0;
 924 }
 925 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 926
 927 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 928 {
 929         u8 *b = (a + size);
 930         u8 c;
 931
 932         for (; size; size--) {
 933                 c = *--b + 1;
 934                 *b = c;
 935                 if (c)
 936                         break;
 937         }
 938 }
 939
 940 void crypto_inc(u8 *a, unsigned int size)
 941 {
 942         __be32 *b = (__be32 *)(a + size);
 943         u32 c;
 944
 945         for (; size >= 4; size -= 4) {
 946                 c = be32_to_cpu(*--b) + 1;
 947                 *b = cpu_to_be32(c);
 948                 if (c)
 949                         return;
 950         }
 951
 952         crypto_inc_byte(a, size);
 953 }
 954 EXPORT_SYMBOL_GPL(crypto_inc);
 955
 956 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 957 {
 958         for (; size; size--)
 959                 *a++ ^= *b++;
 960 }
 961
 962 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 963 {
 964         u32 *a = (u32 *)dst;
 965         u32 *b = (u32 *)src;
 966
 967         for (; size >= 4; size -= 4)
 968                 *a++ ^= *b++;
 969
 970         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 971 }
 972 EXPORT_SYMBOL_GPL(crypto_xor);
 973
 974 static int __init crypto_algapi_init(void)
 975 {
 976         crypto_init_proc();
 977         return 0;
 978 }
 979
 980 static void __exit crypto_algapi_exit(void)
 981 {
 982         crypto_exit_proc();
 983 }
 984
 985 module_init(crypto_algapi_init);
 986 module_exit(crypto_algapi_exit);
 987
 988 MODULE_LICENSE("GPL");
 989 MODULE_DESCRIPTION("Cryptographic algorithms API");