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         bool best;
 261
 262         down_write(&crypto_alg_sem);
 263         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 264                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 265                         continue;
 266
 267                 test = (struct crypto_larval *)q;
 268
 269                 if (!strcmp(q->cra_driver_name, name))
 270                         goto found;
 271         }
 272
 273         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 274         goto unlock;
 275
 276 found:
 277         q->cra_flags |= CRYPTO_ALG_DEAD;
 278         alg = test->adult;
 279         if (err || list_empty(&alg->cra_list))
 280                 goto complete;
 281
 282         alg->cra_flags |= CRYPTO_ALG_TESTED;
 283
 284         /* Only satisfy larval waiters if we are the best. */
 285         best = true;
 286         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 287                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 288                         continue;
 289
 290                 if (strcmp(alg->cra_name, q->cra_name))
 291                         continue;
 292
 293                 if (q->cra_priority > alg->cra_priority) {
 294                         best = false;
 295                         break;
 296                 }
 297         }
 298
 299         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 300                 if (q == alg)
 301                         continue;
 302
 303                 if (crypto_is_moribund(q))
 304                         continue;
 305
 306                 if (crypto_is_larval(q)) {
 307                         struct crypto_larval *larval = (void *)q;
 308
 309                         /*
 310                          * Check to see if either our generic name or
 311                          * specific name can satisfy the name requested
 312                          * by the larval entry q.
 313                          */
 314                         if (strcmp(alg->cra_name, q->cra_name) &&
 315                             strcmp(alg->cra_driver_name, q->cra_name))
 316                                 continue;
 317
 318                         if (larval->adult)
 319                                 continue;
 320                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 321                                 continue;
 322
 323                         if (best && crypto_mod_get(alg))
 324                                 larval->adult = alg;
 325                         else
 326                                 larval->adult = ERR_PTR(-EAGAIN);
 327
 328                         continue;
 329                 }
 330
 331                 if (strcmp(alg->cra_name, q->cra_name))
 332                         continue;
 333
 334                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 335                     q->cra_priority > alg->cra_priority)
 336                         continue;
 337
 338                 crypto_remove_spawns(q, &list, alg);
 339         }
 340
 341 complete:
 342         complete_all(&test->completion);
 343
 344 unlock:
 345         up_write(&crypto_alg_sem);
 346
 347         crypto_remove_final(&list);
 348 }
 349 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 350
 351 void crypto_remove_final(struct list_head *list)
 352 {
 353         struct crypto_alg *alg;
 354         struct crypto_alg *n;
 355
 356         list_for_each_entry_safe(alg, n, list, cra_list) {
 357                 list_del_init(&alg->cra_list);
 358                 crypto_alg_put(alg);
 359         }
 360 }
 361 EXPORT_SYMBOL_GPL(crypto_remove_final);
 362
 363 static void crypto_wait_for_test(struct crypto_larval *larval)
 364 {
 365         int err;
 366
 367         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 368         if (err != NOTIFY_STOP) {
 369                 if (WARN_ON(err != NOTIFY_DONE))
 370                         goto out;
 371                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 372         }
 373
 374         err = wait_for_completion_killable(&larval->completion);
 375         WARN_ON(err);
 376         if (!err)
 377                 crypto_notify(CRYPTO_MSG_ALG_LOADED, larval);
 378
 379 out:
 380         crypto_larval_kill(&larval->alg);
 381 }
 382
 383 int crypto_register_alg(struct crypto_alg *alg)
 384 {
 385         struct crypto_larval *larval;
 386         int err;
 387
 388         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 389         err = crypto_check_alg(alg);
 390         if (err)
 391                 return err;
 392
 393         down_write(&crypto_alg_sem);
 394         larval = __crypto_register_alg(alg);
 395         up_write(&crypto_alg_sem);
 396
 397         if (IS_ERR(larval))
 398                 return PTR_ERR(larval);
 399
 400         crypto_wait_for_test(larval);
 401         return 0;
 402 }
 403 EXPORT_SYMBOL_GPL(crypto_register_alg);
 404
 405 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 406 {
 407         if (unlikely(list_empty(&alg->cra_list)))
 408                 return -ENOENT;
 409
 410         alg->cra_flags |= CRYPTO_ALG_DEAD;
 411
 412         list_del_init(&alg->cra_list);
 413         crypto_remove_spawns(alg, list, NULL);
 414
 415         return 0;
 416 }
 417
 418 int crypto_unregister_alg(struct crypto_alg *alg)
 419 {
 420         int ret;
 421         LIST_HEAD(list);
 422
 423         down_write(&crypto_alg_sem);
 424         ret = crypto_remove_alg(alg, &list);
 425         up_write(&crypto_alg_sem);
 426
 427         if (ret)
 428                 return ret;
 429
 430         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 431         if (alg->cra_destroy)
 432                 alg->cra_destroy(alg);
 433
 434         crypto_remove_final(&list);
 435         return 0;
 436 }
 437 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 438
 439 int crypto_register_algs(struct crypto_alg *algs, int count)
 440 {
 441         int i, ret;
 442
 443         for (i = 0; i < count; i++) {
 444                 ret = crypto_register_alg(&algs[i]);
 445                 if (ret)
 446                         goto err;
 447         }
 448
 449         return 0;
 450
 451 err:
 452         for (--i; i >= 0; --i)
 453                 crypto_unregister_alg(&algs[i]);
 454
 455         return ret;
 456 }
 457 EXPORT_SYMBOL_GPL(crypto_register_algs);
 458
 459 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 460 {
 461         int i, ret;
 462
 463         for (i = 0; i < count; i++) {
 464                 ret = crypto_unregister_alg(&algs[i]);
 465                 if (ret)
 466                         pr_err("Failed to unregister %s %s: %d\n",
 467                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 468         }
 469
 470         return 0;
 471 }
 472 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 473
 474 int crypto_register_template(struct crypto_template *tmpl)
 475 {
 476         struct crypto_template *q;
 477         int err = -EEXIST;
 478
 479         down_write(&crypto_alg_sem);
 480
 481         crypto_check_module_sig(tmpl->module);
 482
 483         list_for_each_entry(q, &crypto_template_list, list) {
 484                 if (q == tmpl)
 485                         goto out;
 486         }
 487
 488         list_add(&tmpl->list, &crypto_template_list);
 489         err = 0;
 490 out:
 491         up_write(&crypto_alg_sem);
 492         return err;
 493 }
 494 EXPORT_SYMBOL_GPL(crypto_register_template);
 495
 496 int crypto_register_templates(struct crypto_template *tmpls, int count)
 497 {
 498         int i, err;
 499
 500         for (i = 0; i < count; i++) {
 501                 err = crypto_register_template(&tmpls[i]);
 502                 if (err)
 503                         goto out;
 504         }
 505         return 0;
 506
 507 out:
 508         for (--i; i >= 0; --i)
 509                 crypto_unregister_template(&tmpls[i]);
 510         return err;
 511 }
 512 EXPORT_SYMBOL_GPL(crypto_register_templates);
 513
 514 void crypto_unregister_template(struct crypto_template *tmpl)
 515 {
 516         struct crypto_instance *inst;
 517         struct hlist_node *n;
 518         struct hlist_head *list;
 519         LIST_HEAD(users);
 520
 521         down_write(&crypto_alg_sem);
 522
 523         BUG_ON(list_empty(&tmpl->list));
 524         list_del_init(&tmpl->list);
 525
 526         list = &tmpl->instances;
 527         hlist_for_each_entry(inst, list, list) {
 528                 int err = crypto_remove_alg(&inst->alg, &users);
 529
 530                 BUG_ON(err);
 531         }
 532
 533         up_write(&crypto_alg_sem);
 534
 535         hlist_for_each_entry_safe(inst, n, list, list) {
 536                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 537                 crypto_free_instance(inst);
 538         }
 539         crypto_remove_final(&users);
 540 }
 541 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 542
 543 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
 544 {
 545         int i;
 546
 547         for (i = count - 1; i >= 0; --i)
 548                 crypto_unregister_template(&tmpls[i]);
 549 }
 550 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
 551
 552 static struct crypto_template *__crypto_lookup_template(const char *name)
 553 {
 554         struct crypto_template *q, *tmpl = NULL;
 555
 556         down_read(&crypto_alg_sem);
 557         list_for_each_entry(q, &crypto_template_list, list) {
 558                 if (strcmp(q->name, name))
 559                         continue;
 560                 if (unlikely(!crypto_tmpl_get(q)))
 561                         continue;
 562
 563                 tmpl = q;
 564                 break;
 565         }
 566         up_read(&crypto_alg_sem);
 567
 568         return tmpl;
 569 }
 570
 571 struct crypto_template *crypto_lookup_template(const char *name)
 572 {
 573         return try_then_request_module(__crypto_lookup_template(name),
 574                                        "crypto-%s", name);
 575 }
 576 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 577
 578 int crypto_register_instance(struct crypto_template *tmpl,
 579                              struct crypto_instance *inst)
 580 {
 581         struct crypto_larval *larval;
 582         int err;
 583
 584         err = crypto_check_alg(&inst->alg);
 585         if (err)
 586                 return err;
 587
 588         inst->alg.cra_module = tmpl->module;
 589         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 590
 591         down_write(&crypto_alg_sem);
 592
 593         larval = __crypto_register_alg(&inst->alg);
 594         if (IS_ERR(larval))
 595                 goto unlock;
 596
 597         hlist_add_head(&inst->list, &tmpl->instances);
 598         inst->tmpl = tmpl;
 599
 600 unlock:
 601         up_write(&crypto_alg_sem);
 602
 603         err = PTR_ERR(larval);
 604         if (IS_ERR(larval))
 605                 goto err;
 606
 607         crypto_wait_for_test(larval);
 608         err = 0;
 609
 610 err:
 611         return err;
 612 }
 613 EXPORT_SYMBOL_GPL(crypto_register_instance);
 614
 615 int crypto_unregister_instance(struct crypto_instance *inst)
 616 {
 617         LIST_HEAD(list);
 618
 619         down_write(&crypto_alg_sem);
 620
 621         crypto_remove_spawns(&inst->alg, &list, NULL);
 622         crypto_remove_instance(inst, &list);
 623
 624         up_write(&crypto_alg_sem);
 625
 626         crypto_remove_final(&list);
 627
 628         return 0;
 629 }
 630 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 631
 632 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 633                       struct crypto_instance *inst, u32 mask)
 634 {
 635         int err = -EAGAIN;
 636
 637         if (WARN_ON_ONCE(inst == NULL))
 638                 return -EINVAL;
 639
 640         spawn->inst = inst;
 641         spawn->mask = mask;
 642
 643         down_write(&crypto_alg_sem);
 644         if (!crypto_is_moribund(alg)) {
 645                 list_add(&spawn->list, &alg->cra_users);
 646                 spawn->alg = alg;
 647                 err = 0;
 648         }
 649         up_write(&crypto_alg_sem);
 650
 651         return err;
 652 }
 653 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 654
 655 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 656                        struct crypto_instance *inst,
 657                        const struct crypto_type *frontend)
 658 {
 659         int err = -EINVAL;
 660
 661         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 662                 goto out;
 663
 664         spawn->frontend = frontend;
 665         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 666
 667 out:
 668         return err;
 669 }
 670 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 671
 672 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 673                       u32 type, u32 mask)
 674 {
 675         struct crypto_alg *alg;
 676         int err;
 677
 678         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 679         if (IS_ERR(alg))
 680                 return PTR_ERR(alg);
 681
 682         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 683         crypto_mod_put(alg);
 684         return err;
 685 }
 686 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 687
 688 void crypto_drop_spawn(struct crypto_spawn *spawn)
 689 {
 690         down_write(&crypto_alg_sem);
 691         if (spawn->alg)
 692                 list_del(&spawn->list);
 693         up_write(&crypto_alg_sem);
 694 }
 695 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 696
 697 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 698 {
 699         struct crypto_alg *alg;
 700
 701         down_read(&crypto_alg_sem);
 702         alg = spawn->alg;
 703         if (alg && !crypto_mod_get(alg)) {
 704                 alg->cra_flags |= CRYPTO_ALG_DYING;
 705                 alg = NULL;
 706         }
 707         up_read(&crypto_alg_sem);
 708
 709         return alg ?: ERR_PTR(-EAGAIN);
 710 }
 711
 712 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 713                                     u32 mask)
 714 {
 715         struct crypto_alg *alg;
 716         struct crypto_tfm *tfm;
 717
 718         alg = crypto_spawn_alg(spawn);
 719         if (IS_ERR(alg))
 720                 return ERR_CAST(alg);
 721
 722         tfm = ERR_PTR(-EINVAL);
 723         if (unlikely((alg->cra_flags ^ type) & mask))
 724                 goto out_put_alg;
 725
 726         tfm = __crypto_alloc_tfm(alg, type, mask);
 727         if (IS_ERR(tfm))
 728                 goto out_put_alg;
 729
 730         return tfm;
 731
 732 out_put_alg:
 733         crypto_mod_put(alg);
 734         return tfm;
 735 }
 736 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 737
 738 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 739 {
 740         struct crypto_alg *alg;
 741         struct crypto_tfm *tfm;
 742
 743         alg = crypto_spawn_alg(spawn);
 744         if (IS_ERR(alg))
 745                 return ERR_CAST(alg);
 746
 747         tfm = crypto_create_tfm(alg, spawn->frontend);
 748         if (IS_ERR(tfm))
 749                 goto out_put_alg;
 750
 751         return tfm;
 752
 753 out_put_alg:
 754         crypto_mod_put(alg);
 755         return tfm;
 756 }
 757 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 758
 759 int crypto_register_notifier(struct notifier_block *nb)
 760 {
 761         return blocking_notifier_chain_register(&crypto_chain, nb);
 762 }
 763 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 764
 765 int crypto_unregister_notifier(struct notifier_block *nb)
 766 {
 767         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 768 }
 769 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 770
 771 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 772 {
 773         struct rtattr *rta = tb[0];
 774         struct crypto_attr_type *algt;
 775
 776         if (!rta)
 777                 return ERR_PTR(-ENOENT);
 778         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 779                 return ERR_PTR(-EINVAL);
 780         if (rta->rta_type != CRYPTOA_TYPE)
 781                 return ERR_PTR(-EINVAL);
 782
 783         algt = RTA_DATA(rta);
 784
 785         return algt;
 786 }
 787 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 788
 789 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 790 {
 791         struct crypto_attr_type *algt;
 792
 793         algt = crypto_get_attr_type(tb);
 794         if (IS_ERR(algt))
 795                 return PTR_ERR(algt);
 796
 797         if ((algt->type ^ type) & algt->mask)
 798                 return -EINVAL;
 799
 800         return 0;
 801 }
 802 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 803
 804 const char *crypto_attr_alg_name(struct rtattr *rta)
 805 {
 806         struct crypto_attr_alg *alga;
 807
 808         if (!rta)
 809                 return ERR_PTR(-ENOENT);
 810         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 811                 return ERR_PTR(-EINVAL);
 812         if (rta->rta_type != CRYPTOA_ALG)
 813                 return ERR_PTR(-EINVAL);
 814
 815         alga = RTA_DATA(rta);
 816         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 817
 818         return alga->name;
 819 }
 820 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 821
 822 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 823                                     const struct crypto_type *frontend,
 824                                     u32 type, u32 mask)
 825 {
 826         const char *name;
 827
 828         name = crypto_attr_alg_name(rta);
 829         if (IS_ERR(name))
 830                 return ERR_CAST(name);
 831
 832         return crypto_find_alg(name, frontend, type, mask);
 833 }
 834 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 835
 836 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 837 {
 838         struct crypto_attr_u32 *nu32;
 839
 840         if (!rta)
 841                 return -ENOENT;
 842         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 843                 return -EINVAL;
 844         if (rta->rta_type != CRYPTOA_U32)
 845                 return -EINVAL;
 846
 847         nu32 = RTA_DATA(rta);
 848         *num = nu32->num;
 849
 850         return 0;
 851 }
 852 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 853
 854 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 855                         struct crypto_alg *alg)
 856 {
 857         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 858                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 859                 return -ENAMETOOLONG;
 860
 861         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 862                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 863                 return -ENAMETOOLONG;
 864
 865         return 0;
 866 }
 867 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 868
 869 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
 870                             unsigned int head)
 871 {
 872         struct crypto_instance *inst;
 873         char *p;
 874         int err;
 875
 876         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 877                     GFP_KERNEL);
 878         if (!p)
 879                 return ERR_PTR(-ENOMEM);
 880
 881         inst = (void *)(p + head);
 882
 883         err = crypto_inst_setname(inst, name, alg);
 884         if (err)
 885                 goto err_free_inst;
 886
 887         return p;
 888
 889 err_free_inst:
 890         kfree(p);
 891         return ERR_PTR(err);
 892 }
 893 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 894
 895 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 896 {
 897         INIT_LIST_HEAD(&queue->list);
 898         queue->backlog = &queue->list;
 899         queue->qlen = 0;
 900         queue->max_qlen = max_qlen;
 901 }
 902 EXPORT_SYMBOL_GPL(crypto_init_queue);
 903
 904 int crypto_enqueue_request(struct crypto_queue *queue,
 905                            struct crypto_async_request *request)
 906 {
 907         int err = -EINPROGRESS;
 908
 909         if (unlikely(queue->qlen >= queue->max_qlen)) {
 910                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 911                         err = -ENOSPC;
 912                         goto out;
 913                 }
 914                 err = -EBUSY;
 915                 if (queue->backlog == &queue->list)
 916                         queue->backlog = &request->list;
 917         }
 918
 919         queue->qlen++;
 920         list_add_tail(&request->list, &queue->list);
 921
 922 out:
 923         return err;
 924 }
 925 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 926
 927 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 928 {
 929         struct list_head *request;
 930
 931         if (unlikely(!queue->qlen))
 932                 return NULL;
 933
 934         queue->qlen--;
 935
 936         if (queue->backlog != &queue->list)
 937                 queue->backlog = queue->backlog->next;
 938
 939         request = queue->list.next;
 940         list_del(request);
 941
 942         return list_entry(request, struct crypto_async_request, list);
 943 }
 944 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 945
 946 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 947 {
 948         u8 *b = (a + size);
 949         u8 c;
 950
 951         for (; size; size--) {
 952                 c = *--b + 1;
 953                 *b = c;
 954                 if (c)
 955                         break;
 956         }
 957 }
 958
 959 void crypto_inc(u8 *a, unsigned int size)
 960 {
 961         __be32 *b = (__be32 *)(a + size);
 962         u32 c;
 963
 964         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 965             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 966                 for (; size >= 4; size -= 4) {
 967                         c = be32_to_cpu(*--b) + 1;
 968                         *b = cpu_to_be32(c);
 969                         if (likely(c))
 970                                 return;
 971                 }
 972
 973         crypto_inc_byte(a, size);
 974 }
 975 EXPORT_SYMBOL_GPL(crypto_inc);
 976
 977 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
 978 {
 979         int relalign = 0;
 980
 981         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
 982                 int size = sizeof(unsigned long);
 983                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
 984                          ((unsigned long)dst ^ (unsigned long)src2)) &
 985                         (size - 1);
 986
 987                 relalign = d ? 1 << __ffs(d) : size;
 988
 989                 /*
 990                  * If we care about alignment, process as many bytes as
 991                  * needed to advance dst and src to values whose alignments
 992                  * equal their relative alignment. This will allow us to
 993                  * process the remainder of the input using optimal strides.
 994                  */
 995                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
 996                         *dst++ = *src1++ ^ *src2++;
 997                         len--;
 998                 }
 999         }
1000
1001         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1002                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1003                 dst += 8;
1004                 src1 += 8;
1005                 src2 += 8;
1006                 len -= 8;
1007         }
1008
1009         while (len >= 4 && !(relalign & 3)) {
1010                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1011                 dst += 4;
1012                 src1 += 4;
1013                 src2 += 4;
1014                 len -= 4;
1015         }
1016
1017         while (len >= 2 && !(relalign & 1)) {
1018                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1019                 dst += 2;
1020                 src1 += 2;
1021                 src2 += 2;
1022                 len -= 2;
1023         }
1024
1025         while (len--)
1026                 *dst++ = *src1++ ^ *src2++;
1027 }
1028 EXPORT_SYMBOL_GPL(__crypto_xor);
1029
1030 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1031 {
1032         return alg->cra_ctxsize +
1033                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1034 }
1035 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1036
1037 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1038                         u32 type, u32 mask)
1039 {
1040         int ret = 0;
1041         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1042
1043         if (!IS_ERR(alg)) {
1044                 crypto_mod_put(alg);
1045                 ret = 1;
1046         }
1047
1048         return ret;
1049 }
1050 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1051
1052 #ifdef CONFIG_CRYPTO_STATS
1053 void crypto_stats_init(struct crypto_alg *alg)
1054 {
1055         memset(&alg->stats, 0, sizeof(alg->stats));
1056 }
1057 EXPORT_SYMBOL_GPL(crypto_stats_init);
1058
1059 void crypto_stats_get(struct crypto_alg *alg)
1060 {
1061         crypto_alg_get(alg);
1062 }
1063 EXPORT_SYMBOL_GPL(crypto_stats_get);
1064
1065 void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1066                                      struct crypto_alg *alg)
1067 {
1068         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1069                 atomic64_inc(&alg->stats.cipher.err_cnt);
1070         } else {
1071                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1072                 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1073         }
1074         crypto_alg_put(alg);
1075 }
1076 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1077
1078 void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1079                                      struct crypto_alg *alg)
1080 {
1081         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1082                 atomic64_inc(&alg->stats.cipher.err_cnt);
1083         } else {
1084                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1085                 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1086         }
1087         crypto_alg_put(alg);
1088 }
1089 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1090
1091 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1092                                int ret)
1093 {
1094         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1095                 atomic64_inc(&alg->stats.aead.err_cnt);
1096         } else {
1097                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1098                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1099         }
1100         crypto_alg_put(alg);
1101 }
1102 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1103
1104 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1105                                int ret)
1106 {
1107         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1108                 atomic64_inc(&alg->stats.aead.err_cnt);
1109         } else {
1110                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1111                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1112         }
1113         crypto_alg_put(alg);
1114 }
1115 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1116
1117 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1118                                    struct crypto_alg *alg)
1119 {
1120         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1121                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1122         } else {
1123                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1124                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1125         }
1126         crypto_alg_put(alg);
1127 }
1128 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1129
1130 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1131                                    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.decrypt_cnt);
1137                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1138         }
1139         crypto_alg_put(alg);
1140 }
1141 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1142
1143 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1144 {
1145         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1146                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1147         else
1148                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1149         crypto_alg_put(alg);
1150 }
1151 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1152
1153 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1154 {
1155         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1156                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1157         else
1158                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1159         crypto_alg_put(alg);
1160 }
1161 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1162
1163 void crypto_stats_compress(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.compress_cnt);
1169                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1170         }
1171         crypto_alg_put(alg);
1172 }
1173 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1174
1175 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1176 {
1177         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1178                 atomic64_inc(&alg->stats.compress.err_cnt);
1179         } else {
1180                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1181                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1182         }
1183         crypto_alg_put(alg);
1184 }
1185 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1186
1187 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1188                                struct crypto_alg *alg)
1189 {
1190         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1191                 atomic64_inc(&alg->stats.hash.err_cnt);
1192         else
1193                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1194         crypto_alg_put(alg);
1195 }
1196 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1197
1198 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1199                               struct crypto_alg *alg)
1200 {
1201         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1202                 atomic64_inc(&alg->stats.hash.err_cnt);
1203         } else {
1204                 atomic64_inc(&alg->stats.hash.hash_cnt);
1205                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1206         }
1207         crypto_alg_put(alg);
1208 }
1209 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1210
1211 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1212 {
1213         if (ret)
1214                 atomic64_inc(&alg->stats.kpp.err_cnt);
1215         else
1216                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1217         crypto_alg_put(alg);
1218 }
1219 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1220
1221 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1222 {
1223         if (ret)
1224                 atomic64_inc(&alg->stats.kpp.err_cnt);
1225         else
1226                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1227         crypto_alg_put(alg);
1228 }
1229 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1230
1231 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1232 {
1233         if (ret)
1234                 atomic64_inc(&alg->stats.kpp.err_cnt);
1235         else
1236                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1237         crypto_alg_put(alg);
1238 }
1239 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1240
1241 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1242 {
1243         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1244                 atomic64_inc(&alg->stats.rng.err_cnt);
1245         else
1246                 atomic64_inc(&alg->stats.rng.seed_cnt);
1247         crypto_alg_put(alg);
1248 }
1249 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1250
1251 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1252                                int ret)
1253 {
1254         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1255                 atomic64_inc(&alg->stats.rng.err_cnt);
1256         } else {
1257                 atomic64_inc(&alg->stats.rng.generate_cnt);
1258                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1259         }
1260         crypto_alg_put(alg);
1261 }
1262 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1263
1264 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1265                                    struct crypto_alg *alg)
1266 {
1267         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1268                 atomic64_inc(&alg->stats.cipher.err_cnt);
1269         } else {
1270                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1271                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1272         }
1273         crypto_alg_put(alg);
1274 }
1275 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1276
1277 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1278                                    struct crypto_alg *alg)
1279 {
1280         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1281                 atomic64_inc(&alg->stats.cipher.err_cnt);
1282         } else {
1283                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1284                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1285         }
1286         crypto_alg_put(alg);
1287 }
1288 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1289 #endif
1290
1291 static int __init crypto_algapi_init(void)
1292 {
1293         crypto_init_proc();
1294         return 0;
1295 }
1296
1297 static void __exit crypto_algapi_exit(void)
1298 {
1299         crypto_exit_proc();
1300 }
1301
1302 module_init(crypto_algapi_init);
1303 module_exit(crypto_algapi_exit);
1304
1305 MODULE_LICENSE("GPL");
1306 MODULE_DESCRIPTION("Cryptographic algorithms API");