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