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                         /*
 173                          * We may encounter an unregistered instance here, since
 174                          * an instance's spawns are set up prior to the instance
 175                          * being registered.  An unregistered instance will have
 176                          * NULL ->cra_users.next, since ->cra_users isn't
 177                          * properly initialized until registration.  But an
 178                          * unregistered instance cannot have any users, so treat
 179                          * it the same as ->cra_users being empty.
 180                          */
 181                         if (spawns->next == NULL)
 182                                 break;
 183                 }
 184         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 185                                               &secondary_spawns)));
 186
 187         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 188                 if (spawn->alg)
 189                         list_move(&spawn->list, &spawn->alg->cra_users);
 190                 else
 191                         crypto_remove_instance(spawn->inst, list);
 192         }
 193 }
 194 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 195
 196 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 197 {
 198         struct crypto_alg *q;
 199         struct crypto_larval *larval;
 200         int ret = -EAGAIN;
 201
 202         if (crypto_is_dead(alg))
 203                 goto err;
 204
 205         INIT_LIST_HEAD(&alg->cra_users);
 206
 207         /* No cheating! */
 208         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 209
 210         ret = -EEXIST;
 211
 212         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 213                 if (q == alg)
 214                         goto err;
 215
 216                 if (crypto_is_moribund(q))
 217                         continue;
 218
 219                 if (crypto_is_larval(q)) {
 220                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 221                                 goto err;
 222                         continue;
 223                 }
 224
 225                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 226                     !strcmp(q->cra_name, alg->cra_driver_name))
 227                         goto err;
 228         }
 229
 230         larval = crypto_larval_alloc(alg->cra_name,
 231                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 232         if (IS_ERR(larval))
 233                 goto out;
 234
 235         ret = -ENOENT;
 236         larval->adult = crypto_mod_get(alg);
 237         if (!larval->adult)
 238                 goto free_larval;
 239
 240         atomic_set(&larval->alg.cra_refcnt, 1);
 241         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 242                CRYPTO_MAX_ALG_NAME);
 243         larval->alg.cra_priority = alg->cra_priority;
 244
 245         list_add(&alg->cra_list, &crypto_alg_list);
 246         list_add(&larval->alg.cra_list, &crypto_alg_list);
 247
 248 out:
 249         return larval;
 250
 251 free_larval:
 252         kfree(larval);
 253 err:
 254         larval = ERR_PTR(ret);
 255         goto out;
 256 }
 257
 258 void crypto_alg_tested(const char *name, int err)
 259 {
 260         struct crypto_larval *test;
 261         struct crypto_alg *alg;
 262         struct crypto_alg *q;
 263         LIST_HEAD(list);
 264
 265         down_write(&crypto_alg_sem);
 266         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 267                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 268                         continue;
 269
 270                 test = (struct crypto_larval *)q;
 271
 272                 if (!strcmp(q->cra_driver_name, name))
 273                         goto found;
 274         }
 275
 276         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 277         goto unlock;
 278
 279 found:
 280         q->cra_flags |= CRYPTO_ALG_DEAD;
 281         alg = test->adult;
 282         if (err || list_empty(&alg->cra_list))
 283                 goto complete;
 284
 285         alg->cra_flags |= CRYPTO_ALG_TESTED;
 286
 287         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 288                 if (q == alg)
 289                         continue;
 290
 291                 if (crypto_is_moribund(q))
 292                         continue;
 293
 294                 if (crypto_is_larval(q)) {
 295                         struct crypto_larval *larval = (void *)q;
 296
 297                         /*
 298                          * Check to see if either our generic name or
 299                          * specific name can satisfy the name requested
 300                          * by the larval entry q.
 301                          */
 302                         if (strcmp(alg->cra_name, q->cra_name) &&
 303                             strcmp(alg->cra_driver_name, q->cra_name))
 304                                 continue;
 305
 306                         if (larval->adult)
 307                                 continue;
 308                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 309                                 continue;
 310                         if (!crypto_mod_get(alg))
 311                                 continue;
 312
 313                         larval->adult = alg;
 314                         continue;
 315                 }
 316
 317                 if (strcmp(alg->cra_name, q->cra_name))
 318                         continue;
 319
 320                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 321                     q->cra_priority > alg->cra_priority)
 322                         continue;
 323
 324                 crypto_remove_spawns(q, &list, alg);
 325         }
 326
 327 complete:
 328         complete_all(&test->completion);
 329
 330 unlock:
 331         up_write(&crypto_alg_sem);
 332
 333         crypto_remove_final(&list);
 334 }
 335 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 336
 337 void crypto_remove_final(struct list_head *list)
 338 {
 339         struct crypto_alg *alg;
 340         struct crypto_alg *n;
 341
 342         list_for_each_entry_safe(alg, n, list, cra_list) {
 343                 list_del_init(&alg->cra_list);
 344                 crypto_alg_put(alg);
 345         }
 346 }
 347 EXPORT_SYMBOL_GPL(crypto_remove_final);
 348
 349 static void crypto_wait_for_test(struct crypto_larval *larval)
 350 {
 351         int err;
 352
 353         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 354         if (err != NOTIFY_STOP) {
 355                 if (WARN_ON(err != NOTIFY_DONE))
 356                         goto out;
 357                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 358         }
 359
 360         err = wait_for_completion_killable(&larval->completion);
 361         WARN_ON(err);
 362
 363 out:
 364         crypto_larval_kill(&larval->alg);
 365 }
 366
 367 int crypto_register_alg(struct crypto_alg *alg)
 368 {
 369         struct crypto_larval *larval;
 370         int err;
 371
 372         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 373         err = crypto_check_alg(alg);
 374         if (err)
 375                 return err;
 376
 377         down_write(&crypto_alg_sem);
 378         larval = __crypto_register_alg(alg);
 379         up_write(&crypto_alg_sem);
 380
 381         if (IS_ERR(larval))
 382                 return PTR_ERR(larval);
 383
 384         crypto_wait_for_test(larval);
 385         return 0;
 386 }
 387 EXPORT_SYMBOL_GPL(crypto_register_alg);
 388
 389 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 390 {
 391         if (unlikely(list_empty(&alg->cra_list)))
 392                 return -ENOENT;
 393
 394         alg->cra_flags |= CRYPTO_ALG_DEAD;
 395
 396         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 397         list_del_init(&alg->cra_list);
 398         crypto_remove_spawns(alg, list, NULL);
 399
 400         return 0;
 401 }
 402
 403 int crypto_unregister_alg(struct crypto_alg *alg)
 404 {
 405         int ret;
 406         LIST_HEAD(list);
 407
 408         down_write(&crypto_alg_sem);
 409         ret = crypto_remove_alg(alg, &list);
 410         up_write(&crypto_alg_sem);
 411
 412         if (ret)
 413                 return ret;
 414
 415         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 416         if (alg->cra_destroy)
 417                 alg->cra_destroy(alg);
 418
 419         crypto_remove_final(&list);
 420         return 0;
 421 }
 422 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 423
 424 int crypto_register_algs(struct crypto_alg *algs, int count)
 425 {
 426         int i, ret;
 427
 428         for (i = 0; i < count; i++) {
 429                 ret = crypto_register_alg(&algs[i]);
 430                 if (ret)
 431                         goto err;
 432         }
 433
 434         return 0;
 435
 436 err:
 437         for (--i; i >= 0; --i)
 438                 crypto_unregister_alg(&algs[i]);
 439
 440         return ret;
 441 }
 442 EXPORT_SYMBOL_GPL(crypto_register_algs);
 443
 444 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 445 {
 446         int i, ret;
 447
 448         for (i = 0; i < count; i++) {
 449                 ret = crypto_unregister_alg(&algs[i]);
 450                 if (ret)
 451                         pr_err("Failed to unregister %s %s: %d\n",
 452                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 453         }
 454
 455         return 0;
 456 }
 457 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 458
 459 int crypto_register_template(struct crypto_template *tmpl)
 460 {
 461         struct crypto_template *q;
 462         int err = -EEXIST;
 463
 464         down_write(&crypto_alg_sem);
 465
 466         crypto_check_module_sig(tmpl->module);
 467
 468         list_for_each_entry(q, &crypto_template_list, list) {
 469                 if (q == tmpl)
 470                         goto out;
 471         }
 472
 473         list_add(&tmpl->list, &crypto_template_list);
 474         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 475         err = 0;
 476 out:
 477         up_write(&crypto_alg_sem);
 478         return err;
 479 }
 480 EXPORT_SYMBOL_GPL(crypto_register_template);
 481
 482 void crypto_unregister_template(struct crypto_template *tmpl)
 483 {
 484         struct crypto_instance *inst;
 485         struct hlist_node *n;
 486         struct hlist_head *list;
 487         LIST_HEAD(users);
 488
 489         down_write(&crypto_alg_sem);
 490
 491         BUG_ON(list_empty(&tmpl->list));
 492         list_del_init(&tmpl->list);
 493
 494         list = &tmpl->instances;
 495         hlist_for_each_entry(inst, list, list) {
 496                 int err = crypto_remove_alg(&inst->alg, &users);
 497
 498                 BUG_ON(err);
 499         }
 500
 501         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 502
 503         up_write(&crypto_alg_sem);
 504
 505         hlist_for_each_entry_safe(inst, n, list, list) {
 506                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 507                 crypto_free_instance(inst);
 508         }
 509         crypto_remove_final(&users);
 510 }
 511 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 512
 513 static struct crypto_template *__crypto_lookup_template(const char *name)
 514 {
 515         struct crypto_template *q, *tmpl = NULL;
 516
 517         down_read(&crypto_alg_sem);
 518         list_for_each_entry(q, &crypto_template_list, list) {
 519                 if (strcmp(q->name, name))
 520                         continue;
 521                 if (unlikely(!crypto_tmpl_get(q)))
 522                         continue;
 523
 524                 tmpl = q;
 525                 break;
 526         }
 527         up_read(&crypto_alg_sem);
 528
 529         return tmpl;
 530 }
 531
 532 struct crypto_template *crypto_lookup_template(const char *name)
 533 {
 534         return try_then_request_module(__crypto_lookup_template(name),
 535                                        "crypto-%s", name);
 536 }
 537 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 538
 539 int crypto_register_instance(struct crypto_template *tmpl,
 540                              struct crypto_instance *inst)
 541 {
 542         struct crypto_larval *larval;
 543         int err;
 544
 545         err = crypto_check_alg(&inst->alg);
 546         if (err)
 547                 return err;
 548
 549         inst->alg.cra_module = tmpl->module;
 550         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 551
 552         if (unlikely(!crypto_mod_get(&inst->alg)))
 553                 return -EAGAIN;
 554
 555         down_write(&crypto_alg_sem);
 556
 557         larval = __crypto_register_alg(&inst->alg);
 558         if (IS_ERR(larval))
 559                 goto unlock;
 560
 561         hlist_add_head(&inst->list, &tmpl->instances);
 562         inst->tmpl = tmpl;
 563
 564 unlock:
 565         up_write(&crypto_alg_sem);
 566
 567         err = PTR_ERR(larval);
 568         if (IS_ERR(larval))
 569                 goto err;
 570
 571         crypto_wait_for_test(larval);
 572
 573         /* Remove instance if test failed */
 574         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 575                 crypto_unregister_instance(inst);
 576         err = 0;
 577
 578 err:
 579         crypto_mod_put(&inst->alg);
 580         return err;
 581 }
 582 EXPORT_SYMBOL_GPL(crypto_register_instance);
 583
 584 int crypto_unregister_instance(struct crypto_instance *inst)
 585 {
 586         LIST_HEAD(list);
 587
 588         down_write(&crypto_alg_sem);
 589
 590         crypto_remove_spawns(&inst->alg, &list, NULL);
 591         crypto_remove_instance(inst, &list);
 592
 593         up_write(&crypto_alg_sem);
 594
 595         crypto_remove_final(&list);
 596
 597         return 0;
 598 }
 599 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 600
 601 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 602                       struct crypto_instance *inst, u32 mask)
 603 {
 604         int err = -EAGAIN;
 605
 606         spawn->inst = inst;
 607         spawn->mask = mask;
 608
 609         down_write(&crypto_alg_sem);
 610         if (!crypto_is_moribund(alg)) {
 611                 list_add(&spawn->list, &alg->cra_users);
 612                 spawn->alg = alg;
 613                 err = 0;
 614         }
 615         up_write(&crypto_alg_sem);
 616
 617         return err;
 618 }
 619 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 620
 621 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 622                        struct crypto_instance *inst,
 623                        const struct crypto_type *frontend)
 624 {
 625         int err = -EINVAL;
 626
 627         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 628                 goto out;
 629
 630         spawn->frontend = frontend;
 631         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 632
 633 out:
 634         return err;
 635 }
 636 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 637
 638 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 639                       u32 type, u32 mask)
 640 {
 641         struct crypto_alg *alg;
 642         int err;
 643
 644         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 645         if (IS_ERR(alg))
 646                 return PTR_ERR(alg);
 647
 648         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 649         crypto_mod_put(alg);
 650         return err;
 651 }
 652 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 653
 654 void crypto_drop_spawn(struct crypto_spawn *spawn)
 655 {
 656         if (!spawn->alg)
 657                 return;
 658
 659         down_write(&crypto_alg_sem);
 660         list_del(&spawn->list);
 661         up_write(&crypto_alg_sem);
 662 }
 663 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 664
 665 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 666 {
 667         struct crypto_alg *alg;
 668         struct crypto_alg *alg2;
 669
 670         down_read(&crypto_alg_sem);
 671         alg = spawn->alg;
 672         alg2 = alg;
 673         if (alg2)
 674                 alg2 = crypto_mod_get(alg2);
 675         up_read(&crypto_alg_sem);
 676
 677         if (!alg2) {
 678                 if (alg)
 679                         crypto_shoot_alg(alg);
 680                 return ERR_PTR(-EAGAIN);
 681         }
 682
 683         return alg;
 684 }
 685
 686 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 687                                     u32 mask)
 688 {
 689         struct crypto_alg *alg;
 690         struct crypto_tfm *tfm;
 691
 692         alg = crypto_spawn_alg(spawn);
 693         if (IS_ERR(alg))
 694                 return ERR_CAST(alg);
 695
 696         tfm = ERR_PTR(-EINVAL);
 697         if (unlikely((alg->cra_flags ^ type) & mask))
 698                 goto out_put_alg;
 699
 700         tfm = __crypto_alloc_tfm(alg, type, mask);
 701         if (IS_ERR(tfm))
 702                 goto out_put_alg;
 703
 704         return tfm;
 705
 706 out_put_alg:
 707         crypto_mod_put(alg);
 708         return tfm;
 709 }
 710 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 711
 712 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 713 {
 714         struct crypto_alg *alg;
 715         struct crypto_tfm *tfm;
 716
 717         alg = crypto_spawn_alg(spawn);
 718         if (IS_ERR(alg))
 719                 return ERR_CAST(alg);
 720
 721         tfm = crypto_create_tfm(alg, spawn->frontend);
 722         if (IS_ERR(tfm))
 723                 goto out_put_alg;
 724
 725         return tfm;
 726
 727 out_put_alg:
 728         crypto_mod_put(alg);
 729         return tfm;
 730 }
 731 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 732
 733 int crypto_register_notifier(struct notifier_block *nb)
 734 {
 735         return blocking_notifier_chain_register(&crypto_chain, nb);
 736 }
 737 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 738
 739 int crypto_unregister_notifier(struct notifier_block *nb)
 740 {
 741         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 742 }
 743 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 744
 745 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 746 {
 747         struct rtattr *rta = tb[0];
 748         struct crypto_attr_type *algt;
 749
 750         if (!rta)
 751                 return ERR_PTR(-ENOENT);
 752         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 753                 return ERR_PTR(-EINVAL);
 754         if (rta->rta_type != CRYPTOA_TYPE)
 755                 return ERR_PTR(-EINVAL);
 756
 757         algt = RTA_DATA(rta);
 758
 759         return algt;
 760 }
 761 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 762
 763 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 764 {
 765         struct crypto_attr_type *algt;
 766
 767         algt = crypto_get_attr_type(tb);
 768         if (IS_ERR(algt))
 769                 return PTR_ERR(algt);
 770
 771         if ((algt->type ^ type) & algt->mask)
 772                 return -EINVAL;
 773
 774         return 0;
 775 }
 776 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 777
 778 const char *crypto_attr_alg_name(struct rtattr *rta)
 779 {
 780         struct crypto_attr_alg *alga;
 781
 782         if (!rta)
 783                 return ERR_PTR(-ENOENT);
 784         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 785                 return ERR_PTR(-EINVAL);
 786         if (rta->rta_type != CRYPTOA_ALG)
 787                 return ERR_PTR(-EINVAL);
 788
 789         alga = RTA_DATA(rta);
 790         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 791
 792         return alga->name;
 793 }
 794 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 795
 796 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 797                                     const struct crypto_type *frontend,
 798                                     u32 type, u32 mask)
 799 {
 800         const char *name;
 801
 802         name = crypto_attr_alg_name(rta);
 803         if (IS_ERR(name))
 804                 return ERR_CAST(name);
 805
 806         return crypto_find_alg(name, frontend, type, mask);
 807 }
 808 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 809
 810 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 811 {
 812         struct crypto_attr_u32 *nu32;
 813
 814         if (!rta)
 815                 return -ENOENT;
 816         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 817                 return -EINVAL;
 818         if (rta->rta_type != CRYPTOA_U32)
 819                 return -EINVAL;
 820
 821         nu32 = RTA_DATA(rta);
 822         *num = nu32->num;
 823
 824         return 0;
 825 }
 826 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 827
 828 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 829                              unsigned int head)
 830 {
 831         struct crypto_instance *inst;
 832         char *p;
 833         int err;
 834
 835         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 836                     GFP_KERNEL);
 837         if (!p)
 838                 return ERR_PTR(-ENOMEM);
 839
 840         inst = (void *)(p + head);
 841
 842         err = -ENAMETOOLONG;
 843         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 844                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 845                 goto err_free_inst;
 846
 847         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 848                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 849                 goto err_free_inst;
 850
 851         return p;
 852
 853 err_free_inst:
 854         kfree(p);
 855         return ERR_PTR(err);
 856 }
 857 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 858
 859 struct crypto_instance *crypto_alloc_instance(const char *name,
 860                                               struct crypto_alg *alg)
 861 {
 862         struct crypto_instance *inst;
 863         struct crypto_spawn *spawn;
 864         int err;
 865
 866         inst = crypto_alloc_instance2(name, alg, 0);
 867         if (IS_ERR(inst))
 868                 goto out;
 869
 870         spawn = crypto_instance_ctx(inst);
 871         err = crypto_init_spawn(spawn, alg, inst,
 872                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 873
 874         if (err)
 875                 goto err_free_inst;
 876
 877         return inst;
 878
 879 err_free_inst:
 880         kfree(inst);
 881         inst = ERR_PTR(err);
 882
 883 out:
 884         return inst;
 885 }
 886 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 887
 888 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 889 {
 890         INIT_LIST_HEAD(&queue->list);
 891         queue->backlog = &queue->list;
 892         queue->qlen = 0;
 893         queue->max_qlen = max_qlen;
 894 }
 895 EXPORT_SYMBOL_GPL(crypto_init_queue);
 896
 897 int crypto_enqueue_request(struct crypto_queue *queue,
 898                            struct crypto_async_request *request)
 899 {
 900         int err = -EINPROGRESS;
 901
 902         if (unlikely(queue->qlen >= queue->max_qlen)) {
 903                 err = -EBUSY;
 904                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 905                         goto out;
 906                 if (queue->backlog == &queue->list)
 907                         queue->backlog = &request->list;
 908         }
 909
 910         queue->qlen++;
 911         list_add_tail(&request->list, &queue->list);
 912
 913 out:
 914         return err;
 915 }
 916 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 917
 918 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 919 {
 920         struct list_head *request;
 921
 922         if (unlikely(!queue->qlen))
 923                 return NULL;
 924
 925         queue->qlen--;
 926
 927         if (queue->backlog != &queue->list)
 928                 queue->backlog = queue->backlog->next;
 929
 930         request = queue->list.next;
 931         list_del(request);
 932
 933         return list_entry(request, struct crypto_async_request, list);
 934 }
 935 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 936
 937 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 938 {
 939         struct crypto_async_request *req;
 940
 941         list_for_each_entry(req, &queue->list, list) {
 942                 if (req->tfm == tfm)
 943                         return 1;
 944         }
 945
 946         return 0;
 947 }
 948 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 949
 950 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 951 {
 952         u8 *b = (a + size);
 953         u8 c;
 954
 955         for (; size; size--) {
 956                 c = *--b + 1;
 957                 *b = c;
 958                 if (c)
 959                         break;
 960         }
 961 }
 962
 963 void crypto_inc(u8 *a, unsigned int size)
 964 {
 965         __be32 *b = (__be32 *)(a + size);
 966         u32 c;
 967
 968         for (; size >= 4; size -= 4) {
 969                 c = be32_to_cpu(*--b) + 1;
 970                 *b = cpu_to_be32(c);
 971                 if (c)
 972                         return;
 973         }
 974
 975         crypto_inc_byte(a, size);
 976 }
 977 EXPORT_SYMBOL_GPL(crypto_inc);
 978
 979 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 980 {
 981         for (; size; size--)
 982                 *a++ ^= *b++;
 983 }
 984
 985 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 986 {
 987         u32 *a = (u32 *)dst;
 988         u32 *b = (u32 *)src;
 989
 990         for (; size >= 4; size -= 4)
 991                 *a++ ^= *b++;
 992
 993         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 994 }
 995 EXPORT_SYMBOL_GPL(crypto_xor);
 996
 997 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 998 {
 999         return alg->cra_ctxsize +
1000                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1001 }
1002 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1003
1004 static int __init crypto_algapi_init(void)
1005 {
1006         crypto_init_proc();
1007         return 0;
1008 }
1009
1010 static void __exit crypto_algapi_exit(void)
1011 {
1012         crypto_exit_proc();
1013 }
1014
1015 module_init(crypto_algapi_init);
1016 module_exit(crypto_algapi_exit);
1017
1018 MODULE_LICENSE("GPL");
1019 MODULE_DESCRIPTION("Cryptographic algorithms API");