crypto/algapi.c

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