crypto/algapi.c

   1 /*
   2  * Cryptographic API for algorithms (i.e., low-level API).
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/errno.h>
  15 #include <linux/fips.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/list.h>
  19 #include <linux/module.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23
  24 #include "internal.h"
  25
  26 static LIST_HEAD(crypto_template_list);
  27
  28 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  29 {
  30         static const char suffix[] = "-generic";
  31         char *driver_name = alg->cra_driver_name;
  32         int len;
  33
  34         if (*driver_name)
  35                 return 0;
  36
  37         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  38         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  39                 return -ENAMETOOLONG;
  40
  41         memcpy(driver_name + len, suffix, sizeof(suffix));
  42         return 0;
  43 }
  44
  45 static inline void crypto_check_module_sig(struct module *mod)
  46 {
  47         if (fips_enabled && mod && !module_sig_ok(mod))
  48                 panic("Module %s signature verification failed in FIPS mode\n",
  49                       module_name(mod));
  50 }
  51
  52 static int crypto_check_alg(struct crypto_alg *alg)
  53 {
  54         crypto_check_module_sig(alg->cra_module);
  55
  56         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  57                 return -EINVAL;
  58
  59         if (alg->cra_blocksize > PAGE_SIZE / 8)
  60                 return -EINVAL;
  61
  62         if (alg->cra_priority < 0)
  63                 return -EINVAL;
  64
  65         atomic_set(&alg->cra_refcnt, 1);
  66
  67         return crypto_set_driver_name(alg);
  68 }
  69
  70 static void crypto_free_instance(struct crypto_instance *inst)
  71 {
  72         if (!inst->alg.cra_type->free) {
  73                 inst->tmpl->free(inst);
  74                 return;
  75         }
  76
  77         inst->alg.cra_type->free(inst);
  78 }
  79
  80 static void crypto_destroy_instance(struct crypto_alg *alg)
  81 {
  82         struct crypto_instance *inst = (void *)alg;
  83         struct crypto_template *tmpl = inst->tmpl;
  84
  85         crypto_free_instance(inst);
  86         crypto_tmpl_put(tmpl);
  87 }
  88
  89 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  90                                             struct list_head *stack,
  91                                             struct list_head *top,
  92                                             struct list_head *secondary_spawns)
  93 {
  94         struct crypto_spawn *spawn, *n;
  95
  96         if (list_empty(stack))
  97                 return NULL;
  98
  99         spawn = list_first_entry(stack, struct crypto_spawn, list);
 100         n = list_entry(spawn->list.next, struct crypto_spawn, list);
 101
 102         if (spawn->alg && &n->list != stack && !n->alg)
 103                 n->alg = (n->list.next == stack) ? alg :
 104                          &list_entry(n->list.next, struct crypto_spawn,
 105                                      list)->inst->alg;
 106
 107         list_move(&spawn->list, secondary_spawns);
 108
 109         return &n->list == stack ? top : &n->inst->alg.cra_users;
 110 }
 111
 112 static void crypto_remove_instance(struct crypto_instance *inst,
 113                                    struct list_head *list)
 114 {
 115         struct crypto_template *tmpl = inst->tmpl;
 116
 117         if (crypto_is_dead(&inst->alg))
 118                 return;
 119
 120         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 121         if (hlist_unhashed(&inst->list))
 122                 return;
 123
 124         if (!tmpl || !crypto_tmpl_get(tmpl))
 125                 return;
 126
 127         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 128         list_move(&inst->alg.cra_list, list);
 129         hlist_del(&inst->list);
 130         inst->alg.cra_destroy = crypto_destroy_instance;
 131
 132         BUG_ON(!list_empty(&inst->alg.cra_users));
 133 }
 134
 135 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 136                           struct crypto_alg *nalg)
 137 {
 138         u32 new_type = (nalg ?: alg)->cra_flags;
 139         struct crypto_spawn *spawn, *n;
 140         LIST_HEAD(secondary_spawns);
 141         struct list_head *spawns;
 142         LIST_HEAD(stack);
 143         LIST_HEAD(top);
 144
 145         spawns = &alg->cra_users;
 146         list_for_each_entry_safe(spawn, n, spawns, list) {
 147                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 148                         continue;
 149
 150                 list_move(&spawn->list, &top);
 151         }
 152
 153         spawns = &top;
 154         do {
 155                 while (!list_empty(spawns)) {
 156                         struct crypto_instance *inst;
 157
 158                         spawn = list_first_entry(spawns, struct crypto_spawn,
 159                                                  list);
 160                         inst = spawn->inst;
 161
 162                         BUG_ON(&inst->alg == alg);
 163
 164                         list_move(&spawn->list, &stack);
 165
 166                         if (&inst->alg == nalg)
 167                                 break;
 168
 169                         spawn->alg = NULL;
 170                         spawns = &inst->alg.cra_users;
 171                 }
 172         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 173                                               &secondary_spawns)));
 174
 175         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 176                 if (spawn->alg)
 177                         list_move(&spawn->list, &spawn->alg->cra_users);
 178                 else
 179                         crypto_remove_instance(spawn->inst, list);
 180         }
 181 }
 182 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 183
 184 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 185 {
 186         struct crypto_alg *q;
 187         struct crypto_larval *larval;
 188         int ret = -EAGAIN;
 189
 190         if (crypto_is_dead(alg))
 191                 goto err;
 192
 193         INIT_LIST_HEAD(&alg->cra_users);
 194
 195         /* No cheating! */
 196         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 197
 198         ret = -EEXIST;
 199
 200         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 201                 if (q == alg)
 202                         goto err;
 203
 204                 if (crypto_is_moribund(q))
 205                         continue;
 206
 207                 if (crypto_is_larval(q)) {
 208                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 209                                 goto err;
 210                         continue;
 211                 }
 212
 213                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 214                     !strcmp(q->cra_name, alg->cra_driver_name))
 215                         goto err;
 216         }
 217
 218         larval = crypto_larval_alloc(alg->cra_name,
 219                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 220         if (IS_ERR(larval))
 221                 goto out;
 222
 223         ret = -ENOENT;
 224         larval->adult = crypto_mod_get(alg);
 225         if (!larval->adult)
 226                 goto free_larval;
 227
 228         atomic_set(&larval->alg.cra_refcnt, 1);
 229         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 230                CRYPTO_MAX_ALG_NAME);
 231         larval->alg.cra_priority = alg->cra_priority;
 232
 233         list_add(&alg->cra_list, &crypto_alg_list);
 234         list_add(&larval->alg.cra_list, &crypto_alg_list);
 235
 236 out:
 237         return larval;
 238
 239 free_larval:
 240         kfree(larval);
 241 err:
 242         larval = ERR_PTR(ret);
 243         goto out;
 244 }
 245
 246 void crypto_alg_tested(const char *name, int err)
 247 {
 248         struct crypto_larval *test;
 249         struct crypto_alg *alg;
 250         struct crypto_alg *q;
 251         LIST_HEAD(list);
 252
 253         down_write(&crypto_alg_sem);
 254         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 255                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 256                         continue;
 257
 258                 test = (struct crypto_larval *)q;
 259
 260                 if (!strcmp(q->cra_driver_name, name))
 261                         goto found;
 262         }
 263
 264         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 265         goto unlock;
 266
 267 found:
 268         q->cra_flags |= CRYPTO_ALG_DEAD;
 269         alg = test->adult;
 270         if (err || list_empty(&alg->cra_list))
 271                 goto complete;
 272
 273         alg->cra_flags |= CRYPTO_ALG_TESTED;
 274
 275         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 276                 if (q == alg)
 277                         continue;
 278
 279                 if (crypto_is_moribund(q))
 280                         continue;
 281
 282                 if (crypto_is_larval(q)) {
 283                         struct crypto_larval *larval = (void *)q;
 284
 285                         /*
 286                          * Check to see if either our generic name or
 287                          * specific name can satisfy the name requested
 288                          * by the larval entry q.
 289                          */
 290                         if (strcmp(alg->cra_name, q->cra_name) &&
 291                             strcmp(alg->cra_driver_name, q->cra_name))
 292                                 continue;
 293
 294                         if (larval->adult)
 295                                 continue;
 296                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 297                                 continue;
 298                         if (!crypto_mod_get(alg))
 299                                 continue;
 300
 301                         larval->adult = alg;
 302                         continue;
 303                 }
 304
 305                 if (strcmp(alg->cra_name, q->cra_name))
 306                         continue;
 307
 308                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 309                     q->cra_priority > alg->cra_priority)
 310                         continue;
 311
 312                 crypto_remove_spawns(q, &list, alg);
 313         }
 314
 315 complete:
 316         complete_all(&test->completion);
 317
 318 unlock:
 319         up_write(&crypto_alg_sem);
 320
 321         crypto_remove_final(&list);
 322 }
 323 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 324
 325 void crypto_remove_final(struct list_head *list)
 326 {
 327         struct crypto_alg *alg;
 328         struct crypto_alg *n;
 329
 330         list_for_each_entry_safe(alg, n, list, cra_list) {
 331                 list_del_init(&alg->cra_list);
 332                 crypto_alg_put(alg);
 333         }
 334 }
 335 EXPORT_SYMBOL_GPL(crypto_remove_final);
 336
 337 static void crypto_wait_for_test(struct crypto_larval *larval)
 338 {
 339         int err;
 340
 341         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 342         if (err != NOTIFY_STOP) {
 343                 if (WARN_ON(err != NOTIFY_DONE))
 344                         goto out;
 345                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 346         }
 347
 348         err = wait_for_completion_killable(&larval->completion);
 349         WARN_ON(err);
 350
 351 out:
 352         crypto_larval_kill(&larval->alg);
 353 }
 354
 355 int crypto_register_alg(struct crypto_alg *alg)
 356 {
 357         struct crypto_larval *larval;
 358         int err;
 359
 360         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 361         err = crypto_check_alg(alg);
 362         if (err)
 363                 return err;
 364
 365         down_write(&crypto_alg_sem);
 366         larval = __crypto_register_alg(alg);
 367         up_write(&crypto_alg_sem);
 368
 369         if (IS_ERR(larval))
 370                 return PTR_ERR(larval);
 371
 372         crypto_wait_for_test(larval);
 373         return 0;
 374 }
 375 EXPORT_SYMBOL_GPL(crypto_register_alg);
 376
 377 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 378 {
 379         if (unlikely(list_empty(&alg->cra_list)))
 380                 return -ENOENT;
 381
 382         alg->cra_flags |= CRYPTO_ALG_DEAD;
 383
 384         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 385         list_del_init(&alg->cra_list);
 386         crypto_remove_spawns(alg, list, NULL);
 387
 388         return 0;
 389 }
 390
 391 int crypto_unregister_alg(struct crypto_alg *alg)
 392 {
 393         int ret;
 394         LIST_HEAD(list);
 395
 396         down_write(&crypto_alg_sem);
 397         ret = crypto_remove_alg(alg, &list);
 398         up_write(&crypto_alg_sem);
 399
 400         if (ret)
 401                 return ret;
 402
 403         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 404         if (alg->cra_destroy)
 405                 alg->cra_destroy(alg);
 406
 407         crypto_remove_final(&list);
 408         return 0;
 409 }
 410 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 411
 412 int crypto_register_algs(struct crypto_alg *algs, int count)
 413 {
 414         int i, ret;
 415
 416         for (i = 0; i < count; i++) {
 417                 ret = crypto_register_alg(&algs[i]);
 418                 if (ret)
 419                         goto err;
 420         }
 421
 422         return 0;
 423
 424 err:
 425         for (--i; i >= 0; --i)
 426                 crypto_unregister_alg(&algs[i]);
 427
 428         return ret;
 429 }
 430 EXPORT_SYMBOL_GPL(crypto_register_algs);
 431
 432 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 433 {
 434         int i, ret;
 435
 436         for (i = 0; i < count; i++) {
 437                 ret = crypto_unregister_alg(&algs[i]);
 438                 if (ret)
 439                         pr_err("Failed to unregister %s %s: %d\n",
 440                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 441         }
 442
 443         return 0;
 444 }
 445 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 446
 447 int crypto_register_template(struct crypto_template *tmpl)
 448 {
 449         struct crypto_template *q;
 450         int err = -EEXIST;
 451
 452         down_write(&crypto_alg_sem);
 453
 454         crypto_check_module_sig(tmpl->module);
 455
 456         list_for_each_entry(q, &crypto_template_list, list) {
 457                 if (q == tmpl)
 458                         goto out;
 459         }
 460
 461         list_add(&tmpl->list, &crypto_template_list);
 462         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 463         err = 0;
 464 out:
 465         up_write(&crypto_alg_sem);
 466         return err;
 467 }
 468 EXPORT_SYMBOL_GPL(crypto_register_template);
 469
 470 void crypto_unregister_template(struct crypto_template *tmpl)
 471 {
 472         struct crypto_instance *inst;
 473         struct hlist_node *n;
 474         struct hlist_head *list;
 475         LIST_HEAD(users);
 476
 477         down_write(&crypto_alg_sem);
 478
 479         BUG_ON(list_empty(&tmpl->list));
 480         list_del_init(&tmpl->list);
 481
 482         list = &tmpl->instances;
 483         hlist_for_each_entry(inst, list, list) {
 484                 int err = crypto_remove_alg(&inst->alg, &users);
 485
 486                 BUG_ON(err);
 487         }
 488
 489         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 490
 491         up_write(&crypto_alg_sem);
 492
 493         hlist_for_each_entry_safe(inst, n, list, list) {
 494                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 495                 crypto_free_instance(inst);
 496         }
 497         crypto_remove_final(&users);
 498 }
 499 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 500
 501 static struct crypto_template *__crypto_lookup_template(const char *name)
 502 {
 503         struct crypto_template *q, *tmpl = NULL;
 504
 505         down_read(&crypto_alg_sem);
 506         list_for_each_entry(q, &crypto_template_list, list) {
 507                 if (strcmp(q->name, name))
 508                         continue;
 509                 if (unlikely(!crypto_tmpl_get(q)))
 510                         continue;
 511
 512                 tmpl = q;
 513                 break;
 514         }
 515         up_read(&crypto_alg_sem);
 516
 517         return tmpl;
 518 }
 519
 520 struct crypto_template *crypto_lookup_template(const char *name)
 521 {
 522         return try_then_request_module(__crypto_lookup_template(name),
 523                                        "crypto-%s", name);
 524 }
 525 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 526
 527 int crypto_register_instance(struct crypto_template *tmpl,
 528                              struct crypto_instance *inst)
 529 {
 530         struct crypto_larval *larval;
 531         int err;
 532
 533         err = crypto_check_alg(&inst->alg);
 534         if (err)
 535                 return err;
 536
 537         inst->alg.cra_module = tmpl->module;
 538         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 539
 540         if (unlikely(!crypto_mod_get(&inst->alg)))
 541                 return -EAGAIN;
 542
 543         down_write(&crypto_alg_sem);
 544
 545         larval = __crypto_register_alg(&inst->alg);
 546         if (IS_ERR(larval))
 547                 goto unlock;
 548
 549         hlist_add_head(&inst->list, &tmpl->instances);
 550         inst->tmpl = tmpl;
 551
 552 unlock:
 553         up_write(&crypto_alg_sem);
 554
 555         err = PTR_ERR(larval);
 556         if (IS_ERR(larval))
 557                 goto err;
 558
 559         crypto_wait_for_test(larval);
 560
 561         /* Remove instance if test failed */
 562         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 563                 crypto_unregister_instance(inst);
 564         err = 0;
 565
 566 err:
 567         crypto_mod_put(&inst->alg);
 568         return err;
 569 }
 570 EXPORT_SYMBOL_GPL(crypto_register_instance);
 571
 572 int crypto_unregister_instance(struct crypto_instance *inst)
 573 {
 574         LIST_HEAD(list);
 575
 576         down_write(&crypto_alg_sem);
 577
 578         crypto_remove_spawns(&inst->alg, &list, NULL);
 579         crypto_remove_instance(inst, &list);
 580
 581         up_write(&crypto_alg_sem);
 582
 583         crypto_remove_final(&list);
 584
 585         return 0;
 586 }
 587 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 588
 589 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 590                       struct crypto_instance *inst, u32 mask)
 591 {
 592         int err = -EAGAIN;
 593
 594         spawn->inst = inst;
 595         spawn->mask = mask;
 596
 597         down_write(&crypto_alg_sem);
 598         if (!crypto_is_moribund(alg)) {
 599                 list_add(&spawn->list, &alg->cra_users);
 600                 spawn->alg = alg;
 601                 err = 0;
 602         }
 603         up_write(&crypto_alg_sem);
 604
 605         return err;
 606 }
 607 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 608
 609 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 610                        struct crypto_instance *inst,
 611                        const struct crypto_type *frontend)
 612 {
 613         int err = -EINVAL;
 614
 615         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 616                 goto out;
 617
 618         spawn->frontend = frontend;
 619         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 620
 621 out:
 622         return err;
 623 }
 624 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 625
 626 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 627                       u32 type, u32 mask)
 628 {
 629         struct crypto_alg *alg;
 630         int err;
 631
 632         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 633         if (IS_ERR(alg))
 634                 return PTR_ERR(alg);
 635
 636         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 637         crypto_mod_put(alg);
 638         return err;
 639 }
 640 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 641
 642 void crypto_drop_spawn(struct crypto_spawn *spawn)
 643 {
 644         if (!spawn->alg)
 645                 return;
 646
 647         down_write(&crypto_alg_sem);
 648         list_del(&spawn->list);
 649         up_write(&crypto_alg_sem);
 650 }
 651 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 652
 653 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 654 {
 655         struct crypto_alg *alg;
 656         struct crypto_alg *alg2;
 657
 658         down_read(&crypto_alg_sem);
 659         alg = spawn->alg;
 660         alg2 = alg;
 661         if (alg2)
 662                 alg2 = crypto_mod_get(alg2);
 663         up_read(&crypto_alg_sem);
 664
 665         if (!alg2) {
 666                 if (alg)
 667                         crypto_shoot_alg(alg);
 668                 return ERR_PTR(-EAGAIN);
 669         }
 670
 671         return alg;
 672 }
 673
 674 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 675                                     u32 mask)
 676 {
 677         struct crypto_alg *alg;
 678         struct crypto_tfm *tfm;
 679
 680         alg = crypto_spawn_alg(spawn);
 681         if (IS_ERR(alg))
 682                 return ERR_CAST(alg);
 683
 684         tfm = ERR_PTR(-EINVAL);
 685         if (unlikely((alg->cra_flags ^ type) & mask))
 686                 goto out_put_alg;
 687
 688         tfm = __crypto_alloc_tfm(alg, type, mask);
 689         if (IS_ERR(tfm))
 690                 goto out_put_alg;
 691
 692         return tfm;
 693
 694 out_put_alg:
 695         crypto_mod_put(alg);
 696         return tfm;
 697 }
 698 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 699
 700 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 701 {
 702         struct crypto_alg *alg;
 703         struct crypto_tfm *tfm;
 704
 705         alg = crypto_spawn_alg(spawn);
 706         if (IS_ERR(alg))
 707                 return ERR_CAST(alg);
 708
 709         tfm = crypto_create_tfm(alg, spawn->frontend);
 710         if (IS_ERR(tfm))
 711                 goto out_put_alg;
 712
 713         return tfm;
 714
 715 out_put_alg:
 716         crypto_mod_put(alg);
 717         return tfm;
 718 }
 719 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 720
 721 int crypto_register_notifier(struct notifier_block *nb)
 722 {
 723         return blocking_notifier_chain_register(&crypto_chain, nb);
 724 }
 725 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 726
 727 int crypto_unregister_notifier(struct notifier_block *nb)
 728 {
 729         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 730 }
 731 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 732
 733 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 734 {
 735         struct rtattr *rta = tb[0];
 736         struct crypto_attr_type *algt;
 737
 738         if (!rta)
 739                 return ERR_PTR(-ENOENT);
 740         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 741                 return ERR_PTR(-EINVAL);
 742         if (rta->rta_type != CRYPTOA_TYPE)
 743                 return ERR_PTR(-EINVAL);
 744
 745         algt = RTA_DATA(rta);
 746
 747         return algt;
 748 }
 749 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 750
 751 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 752 {
 753         struct crypto_attr_type *algt;
 754
 755         algt = crypto_get_attr_type(tb);
 756         if (IS_ERR(algt))
 757                 return PTR_ERR(algt);
 758
 759         if ((algt->type ^ type) & algt->mask)
 760                 return -EINVAL;
 761
 762         return 0;
 763 }
 764 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 765
 766 const char *crypto_attr_alg_name(struct rtattr *rta)
 767 {
 768         struct crypto_attr_alg *alga;
 769
 770         if (!rta)
 771                 return ERR_PTR(-ENOENT);
 772         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 773                 return ERR_PTR(-EINVAL);
 774         if (rta->rta_type != CRYPTOA_ALG)
 775                 return ERR_PTR(-EINVAL);
 776
 777         alga = RTA_DATA(rta);
 778         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 779
 780         return alga->name;
 781 }
 782 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 783
 784 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 785                                     const struct crypto_type *frontend,
 786                                     u32 type, u32 mask)
 787 {
 788         const char *name;
 789
 790         name = crypto_attr_alg_name(rta);
 791         if (IS_ERR(name))
 792                 return ERR_CAST(name);
 793
 794         return crypto_find_alg(name, frontend, type, mask);
 795 }
 796 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 797
 798 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 799 {
 800         struct crypto_attr_u32 *nu32;
 801
 802         if (!rta)
 803                 return -ENOENT;
 804         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 805                 return -EINVAL;
 806         if (rta->rta_type != CRYPTOA_U32)
 807                 return -EINVAL;
 808
 809         nu32 = RTA_DATA(rta);
 810         *num = nu32->num;
 811
 812         return 0;
 813 }
 814 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 815
 816 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 817                              unsigned int head)
 818 {
 819         struct crypto_instance *inst;
 820         char *p;
 821         int err;
 822
 823         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 824                     GFP_KERNEL);
 825         if (!p)
 826                 return ERR_PTR(-ENOMEM);
 827
 828         inst = (void *)(p + head);
 829
 830         err = -ENAMETOOLONG;
 831         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 832                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 833                 goto err_free_inst;
 834
 835         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 836                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 837                 goto err_free_inst;
 838
 839         return p;
 840
 841 err_free_inst:
 842         kfree(p);
 843         return ERR_PTR(err);
 844 }
 845 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 846
 847 struct crypto_instance *crypto_alloc_instance(const char *name,
 848                                               struct crypto_alg *alg)
 849 {
 850         struct crypto_instance *inst;
 851         struct crypto_spawn *spawn;
 852         int err;
 853
 854         inst = crypto_alloc_instance2(name, alg, 0);
 855         if (IS_ERR(inst))
 856                 goto out;
 857
 858         spawn = crypto_instance_ctx(inst);
 859         err = crypto_init_spawn(spawn, alg, inst,
 860                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 861
 862         if (err)
 863                 goto err_free_inst;
 864
 865         return inst;
 866
 867 err_free_inst:
 868         kfree(inst);
 869         inst = ERR_PTR(err);
 870
 871 out:
 872         return inst;
 873 }
 874 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 875
 876 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 877 {
 878         INIT_LIST_HEAD(&queue->list);
 879         queue->backlog = &queue->list;
 880         queue->qlen = 0;
 881         queue->max_qlen = max_qlen;
 882 }
 883 EXPORT_SYMBOL_GPL(crypto_init_queue);
 884
 885 int crypto_enqueue_request(struct crypto_queue *queue,
 886                            struct crypto_async_request *request)
 887 {
 888         int err = -EINPROGRESS;
 889
 890         if (unlikely(queue->qlen >= queue->max_qlen)) {
 891                 err = -EBUSY;
 892                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 893                         goto out;
 894                 if (queue->backlog == &queue->list)
 895                         queue->backlog = &request->list;
 896         }
 897
 898         queue->qlen++;
 899         list_add_tail(&request->list, &queue->list);
 900
 901 out:
 902         return err;
 903 }
 904 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 905
 906 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 907 {
 908         struct list_head *request;
 909
 910         if (unlikely(!queue->qlen))
 911                 return NULL;
 912
 913         queue->qlen--;
 914
 915         if (queue->backlog != &queue->list)
 916                 queue->backlog = queue->backlog->next;
 917
 918         request = queue->list.next;
 919         list_del(request);
 920
 921         return list_entry(request, struct crypto_async_request, list);
 922 }
 923 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 924
 925 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 926 {
 927         struct crypto_async_request *req;
 928
 929         list_for_each_entry(req, &queue->list, list) {
 930                 if (req->tfm == tfm)
 931                         return 1;
 932         }
 933
 934         return 0;
 935 }
 936 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 937
 938 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 939 {
 940         u8 *b = (a + size);
 941         u8 c;
 942
 943         for (; size; size--) {
 944                 c = *--b + 1;
 945                 *b = c;
 946                 if (c)
 947                         break;
 948         }
 949 }
 950
 951 void crypto_inc(u8 *a, unsigned int size)
 952 {
 953         __be32 *b = (__be32 *)(a + size);
 954         u32 c;
 955
 956         for (; size >= 4; size -= 4) {
 957                 c = be32_to_cpu(*--b) + 1;
 958                 *b = cpu_to_be32(c);
 959                 if (c)
 960                         return;
 961         }
 962
 963         crypto_inc_byte(a, size);
 964 }
 965 EXPORT_SYMBOL_GPL(crypto_inc);
 966
 967 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 968 {
 969         for (; size; size--)
 970                 *a++ ^= *b++;
 971 }
 972
 973 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 974 {
 975         u32 *a = (u32 *)dst;
 976         u32 *b = (u32 *)src;
 977
 978         for (; size >= 4; size -= 4)
 979                 *a++ ^= *b++;
 980
 981         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 982 }
 983 EXPORT_SYMBOL_GPL(crypto_xor);
 984
 985 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 986 {
 987         return alg->cra_ctxsize +
 988                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
 989 }
 990 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
 991
 992 static int __init crypto_algapi_init(void)
 993 {
 994         crypto_init_proc();
 995         return 0;
 996 }
 997
 998 static void __exit crypto_algapi_exit(void)
 999 {
1000         crypto_exit_proc();
1001 }
1002
1003 module_init(crypto_algapi_init);
1004 module_exit(crypto_algapi_exit);
1005
1006 MODULE_LICENSE("GPL");
1007 MODULE_DESCRIPTION("Cryptographic algorithms API");