crypto/algapi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API for algorithms (i.e., low-level API).
   4  *
   5  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   6  */
   7
   8 #include <crypto/algapi.h>
   9 #include <linux/err.h>
  10 #include <linux/errno.h>
  11 #include <linux/fips.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/list.h>
  15 #include <linux/module.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/slab.h>
  18 #include <linux/string.h>
  19
  20 #include "internal.h"
  21
  22 static LIST_HEAD(crypto_template_list);
  23
  24 static inline void crypto_check_module_sig(struct module *mod)
  25 {
  26         if (fips_enabled && mod && !module_sig_ok(mod))
  27                 panic("Module %s signature verification failed in FIPS mode\n",
  28                       module_name(mod));
  29 }
  30
  31 static int crypto_check_alg(struct crypto_alg *alg)
  32 {
  33         crypto_check_module_sig(alg->cra_module);
  34
  35         if (!alg->cra_name[0] || !alg->cra_driver_name[0])
  36                 return -EINVAL;
  37
  38         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  39                 return -EINVAL;
  40
  41         /* General maximums for all algs. */
  42         if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
  43                 return -EINVAL;
  44
  45         if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
  46                 return -EINVAL;
  47
  48         /* Lower maximums for specific alg types. */
  49         if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  50                                CRYPTO_ALG_TYPE_CIPHER) {
  51                 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
  52                         return -EINVAL;
  53
  54                 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
  55                         return -EINVAL;
  56         }
  57
  58         if (alg->cra_priority < 0)
  59                 return -EINVAL;
  60
  61         refcount_set(&alg->cra_refcnt, 1);
  62
  63         return 0;
  64 }
  65
  66 static void crypto_free_instance(struct crypto_instance *inst)
  67 {
  68         if (!inst->alg.cra_type->free) {
  69                 inst->tmpl->free(inst);
  70                 return;
  71         }
  72
  73         inst->alg.cra_type->free(inst);
  74 }
  75
  76 static void crypto_destroy_instance(struct crypto_alg *alg)
  77 {
  78         struct crypto_instance *inst = (void *)alg;
  79         struct crypto_template *tmpl = inst->tmpl;
  80
  81         crypto_free_instance(inst);
  82         crypto_tmpl_put(tmpl);
  83 }
  84
  85 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  86                                             struct list_head *stack,
  87                                             struct list_head *top,
  88                                             struct list_head *secondary_spawns)
  89 {
  90         struct crypto_spawn *spawn, *n;
  91
  92         spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
  93         if (!spawn)
  94                 return NULL;
  95
  96         n = list_next_entry(spawn, list);
  97
  98         if (spawn->alg && &n->list != stack && !n->alg)
  99                 n->alg = (n->list.next == stack) ? alg :
 100                          &list_next_entry(n, list)->inst->alg;
 101
 102         list_move(&spawn->list, secondary_spawns);
 103
 104         return &n->list == stack ? top : &n->inst->alg.cra_users;
 105 }
 106
 107 static void crypto_remove_instance(struct crypto_instance *inst,
 108                                    struct list_head *list)
 109 {
 110         struct crypto_template *tmpl = inst->tmpl;
 111
 112         if (crypto_is_dead(&inst->alg))
 113                 return;
 114
 115         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 116         if (hlist_unhashed(&inst->list))
 117                 return;
 118
 119         if (!tmpl || !crypto_tmpl_get(tmpl))
 120                 return;
 121
 122         list_move(&inst->alg.cra_list, list);
 123         hlist_del(&inst->list);
 124         inst->alg.cra_destroy = crypto_destroy_instance;
 125
 126         BUG_ON(!list_empty(&inst->alg.cra_users));
 127 }
 128
 129 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 130                           struct crypto_alg *nalg)
 131 {
 132         u32 new_type = (nalg ?: alg)->cra_flags;
 133         struct crypto_spawn *spawn, *n;
 134         LIST_HEAD(secondary_spawns);
 135         struct list_head *spawns;
 136         LIST_HEAD(stack);
 137         LIST_HEAD(top);
 138
 139         spawns = &alg->cra_users;
 140         list_for_each_entry_safe(spawn, n, spawns, list) {
 141                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 142                         continue;
 143
 144                 list_move(&spawn->list, &top);
 145         }
 146
 147         spawns = &top;
 148         do {
 149                 while (!list_empty(spawns)) {
 150                         struct crypto_instance *inst;
 151
 152                         spawn = list_first_entry(spawns, struct crypto_spawn,
 153                                                  list);
 154                         inst = spawn->inst;
 155
 156                         BUG_ON(&inst->alg == alg);
 157
 158                         list_move(&spawn->list, &stack);
 159
 160                         if (&inst->alg == nalg)
 161                                 break;
 162
 163                         spawn->alg = NULL;
 164                         spawns = &inst->alg.cra_users;
 165
 166                         /*
 167                          * We may encounter an unregistered instance here, since
 168                          * an instance's spawns are set up prior to the instance
 169                          * being registered.  An unregistered instance will have
 170                          * NULL ->cra_users.next, since ->cra_users isn't
 171                          * properly initialized until registration.  But an
 172                          * unregistered instance cannot have any users, so treat
 173                          * it the same as ->cra_users being empty.
 174                          */
 175                         if (spawns->next == NULL)
 176                                 break;
 177                 }
 178         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 179                                               &secondary_spawns)));
 180
 181         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 182                 if (spawn->alg)
 183                         list_move(&spawn->list, &spawn->alg->cra_users);
 184                 else
 185                         crypto_remove_instance(spawn->inst, list);
 186         }
 187 }
 188 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 189
 190 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 191 {
 192         struct crypto_alg *q;
 193         struct crypto_larval *larval;
 194         int ret = -EAGAIN;
 195
 196         if (crypto_is_dead(alg))
 197                 goto err;
 198
 199         INIT_LIST_HEAD(&alg->cra_users);
 200
 201         /* No cheating! */
 202         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 203
 204         ret = -EEXIST;
 205
 206         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 207                 if (q == alg)
 208                         goto err;
 209
 210                 if (crypto_is_moribund(q))
 211                         continue;
 212
 213                 if (crypto_is_larval(q)) {
 214                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 215                                 goto err;
 216                         continue;
 217                 }
 218
 219                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 220                     !strcmp(q->cra_name, alg->cra_driver_name))
 221                         goto err;
 222         }
 223
 224         larval = crypto_larval_alloc(alg->cra_name,
 225                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 226         if (IS_ERR(larval))
 227                 goto out;
 228
 229         ret = -ENOENT;
 230         larval->adult = crypto_mod_get(alg);
 231         if (!larval->adult)
 232                 goto free_larval;
 233
 234         refcount_set(&larval->alg.cra_refcnt, 1);
 235         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 236                CRYPTO_MAX_ALG_NAME);
 237         larval->alg.cra_priority = alg->cra_priority;
 238
 239         list_add(&alg->cra_list, &crypto_alg_list);
 240         list_add(&larval->alg.cra_list, &crypto_alg_list);
 241
 242         crypto_stats_init(alg);
 243
 244 out:
 245         return larval;
 246
 247 free_larval:
 248         kfree(larval);
 249 err:
 250         larval = ERR_PTR(ret);
 251         goto out;
 252 }
 253
 254 void crypto_alg_tested(const char *name, int err)
 255 {
 256         struct crypto_larval *test;
 257         struct crypto_alg *alg;
 258         struct crypto_alg *q;
 259         LIST_HEAD(list);
 260
 261         down_write(&crypto_alg_sem);
 262         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 263                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 264                         continue;
 265
 266                 test = (struct crypto_larval *)q;
 267
 268                 if (!strcmp(q->cra_driver_name, name))
 269                         goto found;
 270         }
 271
 272         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 273         goto unlock;
 274
 275 found:
 276         q->cra_flags |= CRYPTO_ALG_DEAD;
 277         alg = test->adult;
 278         if (err || list_empty(&alg->cra_list))
 279                 goto complete;
 280
 281         alg->cra_flags |= CRYPTO_ALG_TESTED;
 282
 283         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 284                 if (q == alg)
 285                         continue;
 286
 287                 if (crypto_is_moribund(q))
 288                         continue;
 289
 290                 if (crypto_is_larval(q)) {
 291                         struct crypto_larval *larval = (void *)q;
 292
 293                         /*
 294                          * Check to see if either our generic name or
 295                          * specific name can satisfy the name requested
 296                          * by the larval entry q.
 297                          */
 298                         if (strcmp(alg->cra_name, q->cra_name) &&
 299                             strcmp(alg->cra_driver_name, q->cra_name))
 300                                 continue;
 301
 302                         if (larval->adult)
 303                                 continue;
 304                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 305                                 continue;
 306                         if (!crypto_mod_get(alg))
 307                                 continue;
 308
 309                         larval->adult = alg;
 310                         continue;
 311                 }
 312
 313                 if (strcmp(alg->cra_name, q->cra_name))
 314                         continue;
 315
 316                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 317                     q->cra_priority > alg->cra_priority)
 318                         continue;
 319
 320                 crypto_remove_spawns(q, &list, alg);
 321         }
 322
 323 complete:
 324         complete_all(&test->completion);
 325
 326 unlock:
 327         up_write(&crypto_alg_sem);
 328
 329         crypto_remove_final(&list);
 330 }
 331 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 332
 333 void crypto_remove_final(struct list_head *list)
 334 {
 335         struct crypto_alg *alg;
 336         struct crypto_alg *n;
 337
 338         list_for_each_entry_safe(alg, n, list, cra_list) {
 339                 list_del_init(&alg->cra_list);
 340                 crypto_alg_put(alg);
 341         }
 342 }
 343 EXPORT_SYMBOL_GPL(crypto_remove_final);
 344
 345 static void crypto_wait_for_test(struct crypto_larval *larval)
 346 {
 347         int err;
 348
 349         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 350         if (err != NOTIFY_STOP) {
 351                 if (WARN_ON(err != NOTIFY_DONE))
 352                         goto out;
 353                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 354         }
 355
 356         err = wait_for_completion_killable(&larval->completion);
 357         WARN_ON(err);
 358         if (!err)
 359                 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
 360
 361 out:
 362         crypto_larval_kill(&larval->alg);
 363 }
 364
 365 int crypto_register_alg(struct crypto_alg *alg)
 366 {
 367         struct crypto_larval *larval;
 368         int err;
 369
 370         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 371         err = crypto_check_alg(alg);
 372         if (err)
 373                 return err;
 374
 375         down_write(&crypto_alg_sem);
 376         larval = __crypto_register_alg(alg);
 377         up_write(&crypto_alg_sem);
 378
 379         if (IS_ERR(larval))
 380                 return PTR_ERR(larval);
 381
 382         crypto_wait_for_test(larval);
 383         return 0;
 384 }
 385 EXPORT_SYMBOL_GPL(crypto_register_alg);
 386
 387 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 388 {
 389         if (unlikely(list_empty(&alg->cra_list)))
 390                 return -ENOENT;
 391
 392         alg->cra_flags |= CRYPTO_ALG_DEAD;
 393
 394         list_del_init(&alg->cra_list);
 395         crypto_remove_spawns(alg, list, NULL);
 396
 397         return 0;
 398 }
 399
 400 int crypto_unregister_alg(struct crypto_alg *alg)
 401 {
 402         int ret;
 403         LIST_HEAD(list);
 404
 405         down_write(&crypto_alg_sem);
 406         ret = crypto_remove_alg(alg, &list);
 407         up_write(&crypto_alg_sem);
 408
 409         if (ret)
 410                 return ret;
 411
 412         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 413         if (alg->cra_destroy)
 414                 alg->cra_destroy(alg);
 415
 416         crypto_remove_final(&list);
 417         return 0;
 418 }
 419 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 420
 421 int crypto_register_algs(struct crypto_alg *algs, int count)
 422 {
 423         int i, ret;
 424
 425         for (i = 0; i < count; i++) {
 426                 ret = crypto_register_alg(&algs[i]);
 427                 if (ret)
 428                         goto err;
 429         }
 430
 431         return 0;
 432
 433 err:
 434         for (--i; i >= 0; --i)
 435                 crypto_unregister_alg(&algs[i]);
 436
 437         return ret;
 438 }
 439 EXPORT_SYMBOL_GPL(crypto_register_algs);
 440
 441 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 442 {
 443         int i, ret;
 444
 445         for (i = 0; i < count; i++) {
 446                 ret = crypto_unregister_alg(&algs[i]);
 447                 if (ret)
 448                         pr_err("Failed to unregister %s %s: %d\n",
 449                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 450         }
 451
 452         return 0;
 453 }
 454 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 455
 456 int crypto_register_template(struct crypto_template *tmpl)
 457 {
 458         struct crypto_template *q;
 459         int err = -EEXIST;
 460
 461         down_write(&crypto_alg_sem);
 462
 463         crypto_check_module_sig(tmpl->module);
 464
 465         list_for_each_entry(q, &crypto_template_list, list) {
 466                 if (q == tmpl)
 467                         goto out;
 468         }
 469
 470         list_add(&tmpl->list, &crypto_template_list);
 471         err = 0;
 472 out:
 473         up_write(&crypto_alg_sem);
 474         return err;
 475 }
 476 EXPORT_SYMBOL_GPL(crypto_register_template);
 477
 478 int crypto_register_templates(struct crypto_template *tmpls, int count)
 479 {
 480         int i, err;
 481
 482         for (i = 0; i < count; i++) {
 483                 err = crypto_register_template(&tmpls[i]);
 484                 if (err)
 485                         goto out;
 486         }
 487         return 0;
 488
 489 out:
 490         for (--i; i >= 0; --i)
 491                 crypto_unregister_template(&tmpls[i]);
 492         return err;
 493 }
 494 EXPORT_SYMBOL_GPL(crypto_register_templates);
 495
 496 void crypto_unregister_template(struct crypto_template *tmpl)
 497 {
 498         struct crypto_instance *inst;
 499         struct hlist_node *n;
 500         struct hlist_head *list;
 501         LIST_HEAD(users);
 502
 503         down_write(&crypto_alg_sem);
 504
 505         BUG_ON(list_empty(&tmpl->list));
 506         list_del_init(&tmpl->list);
 507
 508         list = &tmpl->instances;
 509         hlist_for_each_entry(inst, list, list) {
 510                 int err = crypto_remove_alg(&inst->alg, &users);
 511
 512                 BUG_ON(err);
 513         }
 514
 515         up_write(&crypto_alg_sem);
 516
 517         hlist_for_each_entry_safe(inst, n, list, list) {
 518                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 519                 crypto_free_instance(inst);
 520         }
 521         crypto_remove_final(&users);
 522 }
 523 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 524
 525 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
 526 {
 527         int i;
 528
 529         for (i = count - 1; i >= 0; --i)
 530                 crypto_unregister_template(&tmpls[i]);
 531 }
 532 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
 533
 534 static struct crypto_template *__crypto_lookup_template(const char *name)
 535 {
 536         struct crypto_template *q, *tmpl = NULL;
 537
 538         down_read(&crypto_alg_sem);
 539         list_for_each_entry(q, &crypto_template_list, list) {
 540                 if (strcmp(q->name, name))
 541                         continue;
 542                 if (unlikely(!crypto_tmpl_get(q)))
 543                         continue;
 544
 545                 tmpl = q;
 546                 break;
 547         }
 548         up_read(&crypto_alg_sem);
 549
 550         return tmpl;
 551 }
 552
 553 struct crypto_template *crypto_lookup_template(const char *name)
 554 {
 555         return try_then_request_module(__crypto_lookup_template(name),
 556                                        "crypto-%s", name);
 557 }
 558 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 559
 560 int crypto_register_instance(struct crypto_template *tmpl,
 561                              struct crypto_instance *inst)
 562 {
 563         struct crypto_larval *larval;
 564         int err;
 565
 566         err = crypto_check_alg(&inst->alg);
 567         if (err)
 568                 return err;
 569
 570         inst->alg.cra_module = tmpl->module;
 571         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 572
 573         down_write(&crypto_alg_sem);
 574
 575         larval = __crypto_register_alg(&inst->alg);
 576         if (IS_ERR(larval))
 577                 goto unlock;
 578
 579         hlist_add_head(&inst->list, &tmpl->instances);
 580         inst->tmpl = tmpl;
 581
 582 unlock:
 583         up_write(&crypto_alg_sem);
 584
 585         err = PTR_ERR(larval);
 586         if (IS_ERR(larval))
 587                 goto err;
 588
 589         crypto_wait_for_test(larval);
 590         err = 0;
 591
 592 err:
 593         return err;
 594 }
 595 EXPORT_SYMBOL_GPL(crypto_register_instance);
 596
 597 int crypto_unregister_instance(struct crypto_instance *inst)
 598 {
 599         LIST_HEAD(list);
 600
 601         down_write(&crypto_alg_sem);
 602
 603         crypto_remove_spawns(&inst->alg, &list, NULL);
 604         crypto_remove_instance(inst, &list);
 605
 606         up_write(&crypto_alg_sem);
 607
 608         crypto_remove_final(&list);
 609
 610         return 0;
 611 }
 612 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 613
 614 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 615                       struct crypto_instance *inst, u32 mask)
 616 {
 617         int err = -EAGAIN;
 618
 619         if (WARN_ON_ONCE(inst == NULL))
 620                 return -EINVAL;
 621
 622         spawn->inst = inst;
 623         spawn->mask = mask;
 624
 625         down_write(&crypto_alg_sem);
 626         if (!crypto_is_moribund(alg)) {
 627                 list_add(&spawn->list, &alg->cra_users);
 628                 spawn->alg = alg;
 629                 err = 0;
 630         }
 631         up_write(&crypto_alg_sem);
 632
 633         return err;
 634 }
 635 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 636
 637 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 638                        struct crypto_instance *inst,
 639                        const struct crypto_type *frontend)
 640 {
 641         int err = -EINVAL;
 642
 643         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 644                 goto out;
 645
 646         spawn->frontend = frontend;
 647         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 648
 649 out:
 650         return err;
 651 }
 652 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 653
 654 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 655                       u32 type, u32 mask)
 656 {
 657         struct crypto_alg *alg;
 658         int err;
 659
 660         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 661         if (IS_ERR(alg))
 662                 return PTR_ERR(alg);
 663
 664         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 665         crypto_mod_put(alg);
 666         return err;
 667 }
 668 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 669
 670 void crypto_drop_spawn(struct crypto_spawn *spawn)
 671 {
 672         down_write(&crypto_alg_sem);
 673         if (spawn->alg)
 674                 list_del(&spawn->list);
 675         up_write(&crypto_alg_sem);
 676 }
 677 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 678
 679 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 680 {
 681         struct crypto_alg *alg;
 682         struct crypto_alg *alg2;
 683
 684         down_read(&crypto_alg_sem);
 685         alg = spawn->alg;
 686         alg2 = alg;
 687         if (alg2)
 688                 alg2 = crypto_mod_get(alg2);
 689         up_read(&crypto_alg_sem);
 690
 691         if (!alg2) {
 692                 if (alg)
 693                         crypto_shoot_alg(alg);
 694                 return ERR_PTR(-EAGAIN);
 695         }
 696
 697         return alg;
 698 }
 699
 700 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 701                                     u32 mask)
 702 {
 703         struct crypto_alg *alg;
 704         struct crypto_tfm *tfm;
 705
 706         alg = crypto_spawn_alg(spawn);
 707         if (IS_ERR(alg))
 708                 return ERR_CAST(alg);
 709
 710         tfm = ERR_PTR(-EINVAL);
 711         if (unlikely((alg->cra_flags ^ type) & mask))
 712                 goto out_put_alg;
 713
 714         tfm = __crypto_alloc_tfm(alg, type, mask);
 715         if (IS_ERR(tfm))
 716                 goto out_put_alg;
 717
 718         return tfm;
 719
 720 out_put_alg:
 721         crypto_mod_put(alg);
 722         return tfm;
 723 }
 724 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 725
 726 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 727 {
 728         struct crypto_alg *alg;
 729         struct crypto_tfm *tfm;
 730
 731         alg = crypto_spawn_alg(spawn);
 732         if (IS_ERR(alg))
 733                 return ERR_CAST(alg);
 734
 735         tfm = crypto_create_tfm(alg, spawn->frontend);
 736         if (IS_ERR(tfm))
 737                 goto out_put_alg;
 738
 739         return tfm;
 740
 741 out_put_alg:
 742         crypto_mod_put(alg);
 743         return tfm;
 744 }
 745 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 746
 747 int crypto_register_notifier(struct notifier_block *nb)
 748 {
 749         return blocking_notifier_chain_register(&crypto_chain, nb);
 750 }
 751 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 752
 753 int crypto_unregister_notifier(struct notifier_block *nb)
 754 {
 755         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 756 }
 757 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 758
 759 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 760 {
 761         struct rtattr *rta = tb[0];
 762         struct crypto_attr_type *algt;
 763
 764         if (!rta)
 765                 return ERR_PTR(-ENOENT);
 766         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 767                 return ERR_PTR(-EINVAL);
 768         if (rta->rta_type != CRYPTOA_TYPE)
 769                 return ERR_PTR(-EINVAL);
 770
 771         algt = RTA_DATA(rta);
 772
 773         return algt;
 774 }
 775 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 776
 777 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 778 {
 779         struct crypto_attr_type *algt;
 780
 781         algt = crypto_get_attr_type(tb);
 782         if (IS_ERR(algt))
 783                 return PTR_ERR(algt);
 784
 785         if ((algt->type ^ type) & algt->mask)
 786                 return -EINVAL;
 787
 788         return 0;
 789 }
 790 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 791
 792 const char *crypto_attr_alg_name(struct rtattr *rta)
 793 {
 794         struct crypto_attr_alg *alga;
 795
 796         if (!rta)
 797                 return ERR_PTR(-ENOENT);
 798         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 799                 return ERR_PTR(-EINVAL);
 800         if (rta->rta_type != CRYPTOA_ALG)
 801                 return ERR_PTR(-EINVAL);
 802
 803         alga = RTA_DATA(rta);
 804         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 805
 806         return alga->name;
 807 }
 808 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 809
 810 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 811                                     const struct crypto_type *frontend,
 812                                     u32 type, u32 mask)
 813 {
 814         const char *name;
 815
 816         name = crypto_attr_alg_name(rta);
 817         if (IS_ERR(name))
 818                 return ERR_CAST(name);
 819
 820         return crypto_find_alg(name, frontend, type, mask);
 821 }
 822 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 823
 824 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 825 {
 826         struct crypto_attr_u32 *nu32;
 827
 828         if (!rta)
 829                 return -ENOENT;
 830         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 831                 return -EINVAL;
 832         if (rta->rta_type != CRYPTOA_U32)
 833                 return -EINVAL;
 834
 835         nu32 = RTA_DATA(rta);
 836         *num = nu32->num;
 837
 838         return 0;
 839 }
 840 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 841
 842 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 843                         struct crypto_alg *alg)
 844 {
 845         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 846                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 847                 return -ENAMETOOLONG;
 848
 849         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 850                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 851                 return -ENAMETOOLONG;
 852
 853         return 0;
 854 }
 855 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 856
 857 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
 858                             unsigned int head)
 859 {
 860         struct crypto_instance *inst;
 861         char *p;
 862         int err;
 863
 864         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 865                     GFP_KERNEL);
 866         if (!p)
 867                 return ERR_PTR(-ENOMEM);
 868
 869         inst = (void *)(p + head);
 870
 871         err = crypto_inst_setname(inst, name, alg);
 872         if (err)
 873                 goto err_free_inst;
 874
 875         return p;
 876
 877 err_free_inst:
 878         kfree(p);
 879         return ERR_PTR(err);
 880 }
 881 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 882
 883 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 884 {
 885         INIT_LIST_HEAD(&queue->list);
 886         queue->backlog = &queue->list;
 887         queue->qlen = 0;
 888         queue->max_qlen = max_qlen;
 889 }
 890 EXPORT_SYMBOL_GPL(crypto_init_queue);
 891
 892 int crypto_enqueue_request(struct crypto_queue *queue,
 893                            struct crypto_async_request *request)
 894 {
 895         int err = -EINPROGRESS;
 896
 897         if (unlikely(queue->qlen >= queue->max_qlen)) {
 898                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 899                         err = -ENOSPC;
 900                         goto out;
 901                 }
 902                 err = -EBUSY;
 903                 if (queue->backlog == &queue->list)
 904                         queue->backlog = &request->list;
 905         }
 906
 907         queue->qlen++;
 908         list_add_tail(&request->list, &queue->list);
 909
 910 out:
 911         return err;
 912 }
 913 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 914
 915 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 916 {
 917         struct list_head *request;
 918
 919         if (unlikely(!queue->qlen))
 920                 return NULL;
 921
 922         queue->qlen--;
 923
 924         if (queue->backlog != &queue->list)
 925                 queue->backlog = queue->backlog->next;
 926
 927         request = queue->list.next;
 928         list_del(request);
 929
 930         return list_entry(request, struct crypto_async_request, list);
 931 }
 932 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 933
 934 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 935 {
 936         u8 *b = (a + size);
 937         u8 c;
 938
 939         for (; size; size--) {
 940                 c = *--b + 1;
 941                 *b = c;
 942                 if (c)
 943                         break;
 944         }
 945 }
 946
 947 void crypto_inc(u8 *a, unsigned int size)
 948 {
 949         __be32 *b = (__be32 *)(a + size);
 950         u32 c;
 951
 952         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 953             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 954                 for (; size >= 4; size -= 4) {
 955                         c = be32_to_cpu(*--b) + 1;
 956                         *b = cpu_to_be32(c);
 957                         if (likely(c))
 958                                 return;
 959                 }
 960
 961         crypto_inc_byte(a, size);
 962 }
 963 EXPORT_SYMBOL_GPL(crypto_inc);
 964
 965 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
 966 {
 967         int relalign = 0;
 968
 969         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
 970                 int size = sizeof(unsigned long);
 971                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
 972                          ((unsigned long)dst ^ (unsigned long)src2)) &
 973                         (size - 1);
 974
 975                 relalign = d ? 1 << __ffs(d) : size;
 976
 977                 /*
 978                  * If we care about alignment, process as many bytes as
 979                  * needed to advance dst and src to values whose alignments
 980                  * equal their relative alignment. This will allow us to
 981                  * process the remainder of the input using optimal strides.
 982                  */
 983                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
 984                         *dst++ = *src1++ ^ *src2++;
 985                         len--;
 986                 }
 987         }
 988
 989         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
 990                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
 991                 dst += 8;
 992                 src1 += 8;
 993                 src2 += 8;
 994                 len -= 8;
 995         }
 996
 997         while (len >= 4 && !(relalign & 3)) {
 998                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
 999                 dst += 4;
1000                 src1 += 4;
1001                 src2 += 4;
1002                 len -= 4;
1003         }
1004
1005         while (len >= 2 && !(relalign & 1)) {
1006                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1007                 dst += 2;
1008                 src1 += 2;
1009                 src2 += 2;
1010                 len -= 2;
1011         }
1012
1013         while (len--)
1014                 *dst++ = *src1++ ^ *src2++;
1015 }
1016 EXPORT_SYMBOL_GPL(__crypto_xor);
1017
1018 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1019 {
1020         return alg->cra_ctxsize +
1021                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1022 }
1023 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1024
1025 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1026                         u32 type, u32 mask)
1027 {
1028         int ret = 0;
1029         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1030
1031         if (!IS_ERR(alg)) {
1032                 crypto_mod_put(alg);
1033                 ret = 1;
1034         }
1035
1036         return ret;
1037 }
1038 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1039
1040 #ifdef CONFIG_CRYPTO_STATS
1041 void crypto_stats_init(struct crypto_alg *alg)
1042 {
1043         memset(&alg->stats, 0, sizeof(alg->stats));
1044 }
1045 EXPORT_SYMBOL_GPL(crypto_stats_init);
1046
1047 void crypto_stats_get(struct crypto_alg *alg)
1048 {
1049         crypto_alg_get(alg);
1050 }
1051 EXPORT_SYMBOL_GPL(crypto_stats_get);
1052
1053 void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1054                                      struct crypto_alg *alg)
1055 {
1056         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1057                 atomic64_inc(&alg->stats.cipher.err_cnt);
1058         } else {
1059                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1060                 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1061         }
1062         crypto_alg_put(alg);
1063 }
1064 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1065
1066 void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1067                                      struct crypto_alg *alg)
1068 {
1069         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1070                 atomic64_inc(&alg->stats.cipher.err_cnt);
1071         } else {
1072                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1073                 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1074         }
1075         crypto_alg_put(alg);
1076 }
1077 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1078
1079 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1080                                int ret)
1081 {
1082         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1083                 atomic64_inc(&alg->stats.aead.err_cnt);
1084         } else {
1085                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1086                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1087         }
1088         crypto_alg_put(alg);
1089 }
1090 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1091
1092 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1093                                int ret)
1094 {
1095         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1096                 atomic64_inc(&alg->stats.aead.err_cnt);
1097         } else {
1098                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1099                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1100         }
1101         crypto_alg_put(alg);
1102 }
1103 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1104
1105 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1106                                    struct crypto_alg *alg)
1107 {
1108         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1109                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1110         } else {
1111                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1112                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1113         }
1114         crypto_alg_put(alg);
1115 }
1116 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1117
1118 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1119                                    struct crypto_alg *alg)
1120 {
1121         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1122                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1123         } else {
1124                 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1125                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1126         }
1127         crypto_alg_put(alg);
1128 }
1129 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1130
1131 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1132 {
1133         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1134                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1135         else
1136                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1137         crypto_alg_put(alg);
1138 }
1139 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1140
1141 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1142 {
1143         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1144                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1145         else
1146                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1147         crypto_alg_put(alg);
1148 }
1149 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1150
1151 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1152 {
1153         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1154                 atomic64_inc(&alg->stats.compress.err_cnt);
1155         } else {
1156                 atomic64_inc(&alg->stats.compress.compress_cnt);
1157                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1158         }
1159         crypto_alg_put(alg);
1160 }
1161 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1162
1163 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1164 {
1165         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1166                 atomic64_inc(&alg->stats.compress.err_cnt);
1167         } else {
1168                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1169                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1170         }
1171         crypto_alg_put(alg);
1172 }
1173 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1174
1175 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1176                                struct crypto_alg *alg)
1177 {
1178         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1179                 atomic64_inc(&alg->stats.hash.err_cnt);
1180         else
1181                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1182         crypto_alg_put(alg);
1183 }
1184 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1185
1186 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1187                               struct crypto_alg *alg)
1188 {
1189         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1190                 atomic64_inc(&alg->stats.hash.err_cnt);
1191         } else {
1192                 atomic64_inc(&alg->stats.hash.hash_cnt);
1193                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1194         }
1195         crypto_alg_put(alg);
1196 }
1197 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1198
1199 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1200 {
1201         if (ret)
1202                 atomic64_inc(&alg->stats.kpp.err_cnt);
1203         else
1204                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1205         crypto_alg_put(alg);
1206 }
1207 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1208
1209 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1210 {
1211         if (ret)
1212                 atomic64_inc(&alg->stats.kpp.err_cnt);
1213         else
1214                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1215         crypto_alg_put(alg);
1216 }
1217 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1218
1219 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1220 {
1221         if (ret)
1222                 atomic64_inc(&alg->stats.kpp.err_cnt);
1223         else
1224                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1225         crypto_alg_put(alg);
1226 }
1227 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1228
1229 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1230 {
1231         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1232                 atomic64_inc(&alg->stats.rng.err_cnt);
1233         else
1234                 atomic64_inc(&alg->stats.rng.seed_cnt);
1235         crypto_alg_put(alg);
1236 }
1237 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1238
1239 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1240                                int ret)
1241 {
1242         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1243                 atomic64_inc(&alg->stats.rng.err_cnt);
1244         } else {
1245                 atomic64_inc(&alg->stats.rng.generate_cnt);
1246                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1247         }
1248         crypto_alg_put(alg);
1249 }
1250 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1251
1252 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1253                                    struct crypto_alg *alg)
1254 {
1255         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1256                 atomic64_inc(&alg->stats.cipher.err_cnt);
1257         } else {
1258                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1259                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1260         }
1261         crypto_alg_put(alg);
1262 }
1263 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1264
1265 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1266                                    struct crypto_alg *alg)
1267 {
1268         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1269                 atomic64_inc(&alg->stats.cipher.err_cnt);
1270         } else {
1271                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1272                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1273         }
1274         crypto_alg_put(alg);
1275 }
1276 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1277 #endif
1278
1279 static int __init crypto_algapi_init(void)
1280 {
1281         crypto_init_proc();
1282         return 0;
1283 }
1284
1285 static void __exit crypto_algapi_exit(void)
1286 {
1287         crypto_exit_proc();
1288 }
1289
1290 module_init(crypto_algapi_init);
1291 module_exit(crypto_algapi_exit);
1292
1293 MODULE_LICENSE("GPL");
1294 MODULE_DESCRIPTION("Cryptographic algorithms API");