crypto/algapi.c

   1 /*
   2  * Cryptographic API for algorithms (i.e., low-level API).
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <crypto/algapi.h>
  14 #include <linux/err.h>
  15 #include <linux/errno.h>
  16 #include <linux/fips.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/list.h>
  20 #include <linux/module.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/slab.h>
  23 #include <linux/string.h>
  24
  25 #include "internal.h"
  26
  27 static LIST_HEAD(crypto_template_list);
  28
  29 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  30 {
  31         static const char suffix[] = "-generic";
  32         char *driver_name = alg->cra_driver_name;
  33         int len;
  34
  35         if (*driver_name)
  36                 return 0;
  37
  38         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  39         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  40                 return -ENAMETOOLONG;
  41
  42         memcpy(driver_name + len, suffix, sizeof(suffix));
  43         return 0;
  44 }
  45
  46 static inline void crypto_check_module_sig(struct module *mod)
  47 {
  48         if (fips_enabled && mod && !module_sig_ok(mod))
  49                 panic("Module %s signature verification failed in FIPS mode\n",
  50                       module_name(mod));
  51 }
  52
  53 static int crypto_check_alg(struct crypto_alg *alg)
  54 {
  55         crypto_check_module_sig(alg->cra_module);
  56
  57         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  58                 return -EINVAL;
  59
  60         /* General maximums for all algs. */
  61         if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
  62                 return -EINVAL;
  63
  64         if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
  65                 return -EINVAL;
  66
  67         /* Lower maximums for specific alg types. */
  68         if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  69                                CRYPTO_ALG_TYPE_CIPHER) {
  70                 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
  71                         return -EINVAL;
  72
  73                 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
  74                         return -EINVAL;
  75         }
  76
  77         if (alg->cra_priority < 0)
  78                 return -EINVAL;
  79
  80         refcount_set(&alg->cra_refcnt, 1);
  81
  82         return crypto_set_driver_name(alg);
  83 }
  84
  85 static void crypto_free_instance(struct crypto_instance *inst)
  86 {
  87         if (!inst->alg.cra_type->free) {
  88                 inst->tmpl->free(inst);
  89                 return;
  90         }
  91
  92         inst->alg.cra_type->free(inst);
  93 }
  94
  95 static void crypto_destroy_instance(struct crypto_alg *alg)
  96 {
  97         struct crypto_instance *inst = (void *)alg;
  98         struct crypto_template *tmpl = inst->tmpl;
  99
 100         crypto_free_instance(inst);
 101         crypto_tmpl_put(tmpl);
 102 }
 103
 104 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
 105                                             struct list_head *stack,
 106                                             struct list_head *top,
 107                                             struct list_head *secondary_spawns)
 108 {
 109         struct crypto_spawn *spawn, *n;
 110
 111         spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
 112         if (!spawn)
 113                 return NULL;
 114
 115         n = list_next_entry(spawn, list);
 116
 117         if (spawn->alg && &n->list != stack && !n->alg)
 118                 n->alg = (n->list.next == stack) ? alg :
 119                          &list_next_entry(n, list)->inst->alg;
 120
 121         list_move(&spawn->list, secondary_spawns);
 122
 123         return &n->list == stack ? top : &n->inst->alg.cra_users;
 124 }
 125
 126 static void crypto_remove_instance(struct crypto_instance *inst,
 127                                    struct list_head *list)
 128 {
 129         struct crypto_template *tmpl = inst->tmpl;
 130
 131         if (crypto_is_dead(&inst->alg))
 132                 return;
 133
 134         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 135         if (hlist_unhashed(&inst->list))
 136                 return;
 137
 138         if (!tmpl || !crypto_tmpl_get(tmpl))
 139                 return;
 140
 141         list_move(&inst->alg.cra_list, list);
 142         hlist_del(&inst->list);
 143         inst->alg.cra_destroy = crypto_destroy_instance;
 144
 145         BUG_ON(!list_empty(&inst->alg.cra_users));
 146 }
 147
 148 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 149                           struct crypto_alg *nalg)
 150 {
 151         u32 new_type = (nalg ?: alg)->cra_flags;
 152         struct crypto_spawn *spawn, *n;
 153         LIST_HEAD(secondary_spawns);
 154         struct list_head *spawns;
 155         LIST_HEAD(stack);
 156         LIST_HEAD(top);
 157
 158         spawns = &alg->cra_users;
 159         list_for_each_entry_safe(spawn, n, spawns, list) {
 160                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 161                         continue;
 162
 163                 list_move(&spawn->list, &top);
 164         }
 165
 166         spawns = &top;
 167         do {
 168                 while (!list_empty(spawns)) {
 169                         struct crypto_instance *inst;
 170
 171                         spawn = list_first_entry(spawns, struct crypto_spawn,
 172                                                  list);
 173                         inst = spawn->inst;
 174
 175                         BUG_ON(&inst->alg == alg);
 176
 177                         list_move(&spawn->list, &stack);
 178
 179                         if (&inst->alg == nalg)
 180                                 break;
 181
 182                         spawn->alg = NULL;
 183                         spawns = &inst->alg.cra_users;
 184
 185                         /*
 186                          * We may encounter an unregistered instance here, since
 187                          * an instance's spawns are set up prior to the instance
 188                          * being registered.  An unregistered instance will have
 189                          * NULL ->cra_users.next, since ->cra_users isn't
 190                          * properly initialized until registration.  But an
 191                          * unregistered instance cannot have any users, so treat
 192                          * it the same as ->cra_users being empty.
 193                          */
 194                         if (spawns->next == NULL)
 195                                 break;
 196                 }
 197         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 198                                               &secondary_spawns)));
 199
 200         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 201                 if (spawn->alg)
 202                         list_move(&spawn->list, &spawn->alg->cra_users);
 203                 else
 204                         crypto_remove_instance(spawn->inst, list);
 205         }
 206 }
 207 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 208
 209 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 210 {
 211         struct crypto_alg *q;
 212         struct crypto_larval *larval;
 213         int ret = -EAGAIN;
 214
 215         if (crypto_is_dead(alg))
 216                 goto err;
 217
 218         INIT_LIST_HEAD(&alg->cra_users);
 219
 220         /* No cheating! */
 221         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 222
 223         ret = -EEXIST;
 224
 225         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 226                 if (q == alg)
 227                         goto err;
 228
 229                 if (crypto_is_moribund(q))
 230                         continue;
 231
 232                 if (crypto_is_larval(q)) {
 233                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 234                                 goto err;
 235                         continue;
 236                 }
 237
 238                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 239                     !strcmp(q->cra_name, alg->cra_driver_name))
 240                         goto err;
 241         }
 242
 243         larval = crypto_larval_alloc(alg->cra_name,
 244                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 245         if (IS_ERR(larval))
 246                 goto out;
 247
 248         ret = -ENOENT;
 249         larval->adult = crypto_mod_get(alg);
 250         if (!larval->adult)
 251                 goto free_larval;
 252
 253         refcount_set(&larval->alg.cra_refcnt, 1);
 254         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 255                CRYPTO_MAX_ALG_NAME);
 256         larval->alg.cra_priority = alg->cra_priority;
 257
 258         list_add(&alg->cra_list, &crypto_alg_list);
 259         list_add(&larval->alg.cra_list, &crypto_alg_list);
 260
 261         crypto_stats_init(alg);
 262
 263 out:
 264         return larval;
 265
 266 free_larval:
 267         kfree(larval);
 268 err:
 269         larval = ERR_PTR(ret);
 270         goto out;
 271 }
 272
 273 void crypto_alg_tested(const char *name, int err)
 274 {
 275         struct crypto_larval *test;
 276         struct crypto_alg *alg;
 277         struct crypto_alg *q;
 278         LIST_HEAD(list);
 279
 280         down_write(&crypto_alg_sem);
 281         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 282                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 283                         continue;
 284
 285                 test = (struct crypto_larval *)q;
 286
 287                 if (!strcmp(q->cra_driver_name, name))
 288                         goto found;
 289         }
 290
 291         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 292         goto unlock;
 293
 294 found:
 295         q->cra_flags |= CRYPTO_ALG_DEAD;
 296         alg = test->adult;
 297         if (err || list_empty(&alg->cra_list))
 298                 goto complete;
 299
 300         alg->cra_flags |= CRYPTO_ALG_TESTED;
 301
 302         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 303                 if (q == alg)
 304                         continue;
 305
 306                 if (crypto_is_moribund(q))
 307                         continue;
 308
 309                 if (crypto_is_larval(q)) {
 310                         struct crypto_larval *larval = (void *)q;
 311
 312                         /*
 313                          * Check to see if either our generic name or
 314                          * specific name can satisfy the name requested
 315                          * by the larval entry q.
 316                          */
 317                         if (strcmp(alg->cra_name, q->cra_name) &&
 318                             strcmp(alg->cra_driver_name, q->cra_name))
 319                                 continue;
 320
 321                         if (larval->adult)
 322                                 continue;
 323                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 324                                 continue;
 325                         if (!crypto_mod_get(alg))
 326                                 continue;
 327
 328                         larval->adult = alg;
 329                         continue;
 330                 }
 331
 332                 if (strcmp(alg->cra_name, q->cra_name))
 333                         continue;
 334
 335                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 336                     q->cra_priority > alg->cra_priority)
 337                         continue;
 338
 339                 crypto_remove_spawns(q, &list, alg);
 340         }
 341
 342 complete:
 343         complete_all(&test->completion);
 344
 345 unlock:
 346         up_write(&crypto_alg_sem);
 347
 348         crypto_remove_final(&list);
 349 }
 350 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 351
 352 void crypto_remove_final(struct list_head *list)
 353 {
 354         struct crypto_alg *alg;
 355         struct crypto_alg *n;
 356
 357         list_for_each_entry_safe(alg, n, list, cra_list) {
 358                 list_del_init(&alg->cra_list);
 359                 crypto_alg_put(alg);
 360         }
 361 }
 362 EXPORT_SYMBOL_GPL(crypto_remove_final);
 363
 364 static void crypto_wait_for_test(struct crypto_larval *larval)
 365 {
 366         int err;
 367
 368         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 369         if (err != NOTIFY_STOP) {
 370                 if (WARN_ON(err != NOTIFY_DONE))
 371                         goto out;
 372                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 373         }
 374
 375         err = wait_for_completion_killable(&larval->completion);
 376         WARN_ON(err);
 377         if (!err)
 378                 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
 379
 380 out:
 381         crypto_larval_kill(&larval->alg);
 382 }
 383
 384 int crypto_register_alg(struct crypto_alg *alg)
 385 {
 386         struct crypto_larval *larval;
 387         int err;
 388
 389         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 390         err = crypto_check_alg(alg);
 391         if (err)
 392                 return err;
 393
 394         down_write(&crypto_alg_sem);
 395         larval = __crypto_register_alg(alg);
 396         up_write(&crypto_alg_sem);
 397
 398         if (IS_ERR(larval))
 399                 return PTR_ERR(larval);
 400
 401         crypto_wait_for_test(larval);
 402         return 0;
 403 }
 404 EXPORT_SYMBOL_GPL(crypto_register_alg);
 405
 406 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 407 {
 408         if (unlikely(list_empty(&alg->cra_list)))
 409                 return -ENOENT;
 410
 411         alg->cra_flags |= CRYPTO_ALG_DEAD;
 412
 413         list_del_init(&alg->cra_list);
 414         crypto_remove_spawns(alg, list, NULL);
 415
 416         return 0;
 417 }
 418
 419 int crypto_unregister_alg(struct crypto_alg *alg)
 420 {
 421         int ret;
 422         LIST_HEAD(list);
 423
 424         down_write(&crypto_alg_sem);
 425         ret = crypto_remove_alg(alg, &list);
 426         up_write(&crypto_alg_sem);
 427
 428         if (ret)
 429                 return ret;
 430
 431         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 432         if (alg->cra_destroy)
 433                 alg->cra_destroy(alg);
 434
 435         crypto_remove_final(&list);
 436         return 0;
 437 }
 438 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 439
 440 int crypto_register_algs(struct crypto_alg *algs, int count)
 441 {
 442         int i, ret;
 443
 444         for (i = 0; i < count; i++) {
 445                 ret = crypto_register_alg(&algs[i]);
 446                 if (ret)
 447                         goto err;
 448         }
 449
 450         return 0;
 451
 452 err:
 453         for (--i; i >= 0; --i)
 454                 crypto_unregister_alg(&algs[i]);
 455
 456         return ret;
 457 }
 458 EXPORT_SYMBOL_GPL(crypto_register_algs);
 459
 460 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 461 {
 462         int i, ret;
 463
 464         for (i = 0; i < count; i++) {
 465                 ret = crypto_unregister_alg(&algs[i]);
 466                 if (ret)
 467                         pr_err("Failed to unregister %s %s: %d\n",
 468                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 469         }
 470
 471         return 0;
 472 }
 473 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 474
 475 int crypto_register_template(struct crypto_template *tmpl)
 476 {
 477         struct crypto_template *q;
 478         int err = -EEXIST;
 479
 480         down_write(&crypto_alg_sem);
 481
 482         crypto_check_module_sig(tmpl->module);
 483
 484         list_for_each_entry(q, &crypto_template_list, list) {
 485                 if (q == tmpl)
 486                         goto out;
 487         }
 488
 489         list_add(&tmpl->list, &crypto_template_list);
 490         err = 0;
 491 out:
 492         up_write(&crypto_alg_sem);
 493         return err;
 494 }
 495 EXPORT_SYMBOL_GPL(crypto_register_template);
 496
 497 int crypto_register_templates(struct crypto_template *tmpls, int count)
 498 {
 499         int i, err;
 500
 501         for (i = 0; i < count; i++) {
 502                 err = crypto_register_template(&tmpls[i]);
 503                 if (err)
 504                         goto out;
 505         }
 506         return 0;
 507
 508 out:
 509         for (--i; i >= 0; --i)
 510                 crypto_unregister_template(&tmpls[i]);
 511         return err;
 512 }
 513 EXPORT_SYMBOL_GPL(crypto_register_templates);
 514
 515 void crypto_unregister_template(struct crypto_template *tmpl)
 516 {
 517         struct crypto_instance *inst;
 518         struct hlist_node *n;
 519         struct hlist_head *list;
 520         LIST_HEAD(users);
 521
 522         down_write(&crypto_alg_sem);
 523
 524         BUG_ON(list_empty(&tmpl->list));
 525         list_del_init(&tmpl->list);
 526
 527         list = &tmpl->instances;
 528         hlist_for_each_entry(inst, list, list) {
 529                 int err = crypto_remove_alg(&inst->alg, &users);
 530
 531                 BUG_ON(err);
 532         }
 533
 534         up_write(&crypto_alg_sem);
 535
 536         hlist_for_each_entry_safe(inst, n, list, list) {
 537                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 538                 crypto_free_instance(inst);
 539         }
 540         crypto_remove_final(&users);
 541 }
 542 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 543
 544 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
 545 {
 546         int i;
 547
 548         for (i = count - 1; i >= 0; --i)
 549                 crypto_unregister_template(&tmpls[i]);
 550 }
 551 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
 552
 553 static struct crypto_template *__crypto_lookup_template(const char *name)
 554 {
 555         struct crypto_template *q, *tmpl = NULL;
 556
 557         down_read(&crypto_alg_sem);
 558         list_for_each_entry(q, &crypto_template_list, list) {
 559                 if (strcmp(q->name, name))
 560                         continue;
 561                 if (unlikely(!crypto_tmpl_get(q)))
 562                         continue;
 563
 564                 tmpl = q;
 565                 break;
 566         }
 567         up_read(&crypto_alg_sem);
 568
 569         return tmpl;
 570 }
 571
 572 struct crypto_template *crypto_lookup_template(const char *name)
 573 {
 574         return try_then_request_module(__crypto_lookup_template(name),
 575                                        "crypto-%s", name);
 576 }
 577 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 578
 579 int crypto_register_instance(struct crypto_template *tmpl,
 580                              struct crypto_instance *inst)
 581 {
 582         struct crypto_larval *larval;
 583         int err;
 584
 585         err = crypto_check_alg(&inst->alg);
 586         if (err)
 587                 return err;
 588
 589         inst->alg.cra_module = tmpl->module;
 590         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 591
 592         down_write(&crypto_alg_sem);
 593
 594         larval = __crypto_register_alg(&inst->alg);
 595         if (IS_ERR(larval))
 596                 goto unlock;
 597
 598         hlist_add_head(&inst->list, &tmpl->instances);
 599         inst->tmpl = tmpl;
 600
 601 unlock:
 602         up_write(&crypto_alg_sem);
 603
 604         err = PTR_ERR(larval);
 605         if (IS_ERR(larval))
 606                 goto err;
 607
 608         crypto_wait_for_test(larval);
 609         err = 0;
 610
 611 err:
 612         return err;
 613 }
 614 EXPORT_SYMBOL_GPL(crypto_register_instance);
 615
 616 int crypto_unregister_instance(struct crypto_instance *inst)
 617 {
 618         LIST_HEAD(list);
 619
 620         down_write(&crypto_alg_sem);
 621
 622         crypto_remove_spawns(&inst->alg, &list, NULL);
 623         crypto_remove_instance(inst, &list);
 624
 625         up_write(&crypto_alg_sem);
 626
 627         crypto_remove_final(&list);
 628
 629         return 0;
 630 }
 631 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 632
 633 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 634                       struct crypto_instance *inst, u32 mask)
 635 {
 636         int err = -EAGAIN;
 637
 638         if (WARN_ON_ONCE(inst == NULL))
 639                 return -EINVAL;
 640
 641         spawn->inst = inst;
 642         spawn->mask = mask;
 643
 644         down_write(&crypto_alg_sem);
 645         if (!crypto_is_moribund(alg)) {
 646                 list_add(&spawn->list, &alg->cra_users);
 647                 spawn->alg = alg;
 648                 err = 0;
 649         }
 650         up_write(&crypto_alg_sem);
 651
 652         return err;
 653 }
 654 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 655
 656 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 657                        struct crypto_instance *inst,
 658                        const struct crypto_type *frontend)
 659 {
 660         int err = -EINVAL;
 661
 662         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 663                 goto out;
 664
 665         spawn->frontend = frontend;
 666         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 667
 668 out:
 669         return err;
 670 }
 671 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 672
 673 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 674                       u32 type, u32 mask)
 675 {
 676         struct crypto_alg *alg;
 677         int err;
 678
 679         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 680         if (IS_ERR(alg))
 681                 return PTR_ERR(alg);
 682
 683         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 684         crypto_mod_put(alg);
 685         return err;
 686 }
 687 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 688
 689 void crypto_drop_spawn(struct crypto_spawn *spawn)
 690 {
 691         if (!spawn->alg)
 692                 return;
 693
 694         down_write(&crypto_alg_sem);
 695         list_del(&spawn->list);
 696         up_write(&crypto_alg_sem);
 697 }
 698 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 699
 700 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 701 {
 702         struct crypto_alg *alg;
 703         struct crypto_alg *alg2;
 704
 705         down_read(&crypto_alg_sem);
 706         alg = spawn->alg;
 707         alg2 = alg;
 708         if (alg2)
 709                 alg2 = crypto_mod_get(alg2);
 710         up_read(&crypto_alg_sem);
 711
 712         if (!alg2) {
 713                 if (alg)
 714                         crypto_shoot_alg(alg);
 715                 return ERR_PTR(-EAGAIN);
 716         }
 717
 718         return alg;
 719 }
 720
 721 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 722                                     u32 mask)
 723 {
 724         struct crypto_alg *alg;
 725         struct crypto_tfm *tfm;
 726
 727         alg = crypto_spawn_alg(spawn);
 728         if (IS_ERR(alg))
 729                 return ERR_CAST(alg);
 730
 731         tfm = ERR_PTR(-EINVAL);
 732         if (unlikely((alg->cra_flags ^ type) & mask))
 733                 goto out_put_alg;
 734
 735         tfm = __crypto_alloc_tfm(alg, type, mask);
 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_tfm);
 746
 747 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 748 {
 749         struct crypto_alg *alg;
 750         struct crypto_tfm *tfm;
 751
 752         alg = crypto_spawn_alg(spawn);
 753         if (IS_ERR(alg))
 754                 return ERR_CAST(alg);
 755
 756         tfm = crypto_create_tfm(alg, spawn->frontend);
 757         if (IS_ERR(tfm))
 758                 goto out_put_alg;
 759
 760         return tfm;
 761
 762 out_put_alg:
 763         crypto_mod_put(alg);
 764         return tfm;
 765 }
 766 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 767
 768 int crypto_register_notifier(struct notifier_block *nb)
 769 {
 770         return blocking_notifier_chain_register(&crypto_chain, nb);
 771 }
 772 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 773
 774 int crypto_unregister_notifier(struct notifier_block *nb)
 775 {
 776         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 777 }
 778 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 779
 780 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 781 {
 782         struct rtattr *rta = tb[0];
 783         struct crypto_attr_type *algt;
 784
 785         if (!rta)
 786                 return ERR_PTR(-ENOENT);
 787         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 788                 return ERR_PTR(-EINVAL);
 789         if (rta->rta_type != CRYPTOA_TYPE)
 790                 return ERR_PTR(-EINVAL);
 791
 792         algt = RTA_DATA(rta);
 793
 794         return algt;
 795 }
 796 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 797
 798 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 799 {
 800         struct crypto_attr_type *algt;
 801
 802         algt = crypto_get_attr_type(tb);
 803         if (IS_ERR(algt))
 804                 return PTR_ERR(algt);
 805
 806         if ((algt->type ^ type) & algt->mask)
 807                 return -EINVAL;
 808
 809         return 0;
 810 }
 811 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 812
 813 const char *crypto_attr_alg_name(struct rtattr *rta)
 814 {
 815         struct crypto_attr_alg *alga;
 816
 817         if (!rta)
 818                 return ERR_PTR(-ENOENT);
 819         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 820                 return ERR_PTR(-EINVAL);
 821         if (rta->rta_type != CRYPTOA_ALG)
 822                 return ERR_PTR(-EINVAL);
 823
 824         alga = RTA_DATA(rta);
 825         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 826
 827         return alga->name;
 828 }
 829 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 830
 831 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 832                                     const struct crypto_type *frontend,
 833                                     u32 type, u32 mask)
 834 {
 835         const char *name;
 836
 837         name = crypto_attr_alg_name(rta);
 838         if (IS_ERR(name))
 839                 return ERR_CAST(name);
 840
 841         return crypto_find_alg(name, frontend, type, mask);
 842 }
 843 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 844
 845 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 846 {
 847         struct crypto_attr_u32 *nu32;
 848
 849         if (!rta)
 850                 return -ENOENT;
 851         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 852                 return -EINVAL;
 853         if (rta->rta_type != CRYPTOA_U32)
 854                 return -EINVAL;
 855
 856         nu32 = RTA_DATA(rta);
 857         *num = nu32->num;
 858
 859         return 0;
 860 }
 861 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 862
 863 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 864                         struct crypto_alg *alg)
 865 {
 866         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 867                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 868                 return -ENAMETOOLONG;
 869
 870         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 871                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 872                 return -ENAMETOOLONG;
 873
 874         return 0;
 875 }
 876 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 877
 878 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
 879                             unsigned int head)
 880 {
 881         struct crypto_instance *inst;
 882         char *p;
 883         int err;
 884
 885         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 886                     GFP_KERNEL);
 887         if (!p)
 888                 return ERR_PTR(-ENOMEM);
 889
 890         inst = (void *)(p + head);
 891
 892         err = crypto_inst_setname(inst, name, alg);
 893         if (err)
 894                 goto err_free_inst;
 895
 896         return p;
 897
 898 err_free_inst:
 899         kfree(p);
 900         return ERR_PTR(err);
 901 }
 902 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 903
 904 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 905 {
 906         INIT_LIST_HEAD(&queue->list);
 907         queue->backlog = &queue->list;
 908         queue->qlen = 0;
 909         queue->max_qlen = max_qlen;
 910 }
 911 EXPORT_SYMBOL_GPL(crypto_init_queue);
 912
 913 int crypto_enqueue_request(struct crypto_queue *queue,
 914                            struct crypto_async_request *request)
 915 {
 916         int err = -EINPROGRESS;
 917
 918         if (unlikely(queue->qlen >= queue->max_qlen)) {
 919                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 920                         err = -ENOSPC;
 921                         goto out;
 922                 }
 923                 err = -EBUSY;
 924                 if (queue->backlog == &queue->list)
 925                         queue->backlog = &request->list;
 926         }
 927
 928         queue->qlen++;
 929         list_add_tail(&request->list, &queue->list);
 930
 931 out:
 932         return err;
 933 }
 934 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 935
 936 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 937 {
 938         struct list_head *request;
 939
 940         if (unlikely(!queue->qlen))
 941                 return NULL;
 942
 943         queue->qlen--;
 944
 945         if (queue->backlog != &queue->list)
 946                 queue->backlog = queue->backlog->next;
 947
 948         request = queue->list.next;
 949         list_del(request);
 950
 951         return list_entry(request, struct crypto_async_request, list);
 952 }
 953 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 954
 955 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 956 {
 957         struct crypto_async_request *req;
 958
 959         list_for_each_entry(req, &queue->list, list) {
 960                 if (req->tfm == tfm)
 961                         return 1;
 962         }
 963
 964         return 0;
 965 }
 966 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 967
 968 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 969 {
 970         u8 *b = (a + size);
 971         u8 c;
 972
 973         for (; size; size--) {
 974                 c = *--b + 1;
 975                 *b = c;
 976                 if (c)
 977                         break;
 978         }
 979 }
 980
 981 void crypto_inc(u8 *a, unsigned int size)
 982 {
 983         __be32 *b = (__be32 *)(a + size);
 984         u32 c;
 985
 986         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 987             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 988                 for (; size >= 4; size -= 4) {
 989                         c = be32_to_cpu(*--b) + 1;
 990                         *b = cpu_to_be32(c);
 991                         if (likely(c))
 992                                 return;
 993                 }
 994
 995         crypto_inc_byte(a, size);
 996 }
 997 EXPORT_SYMBOL_GPL(crypto_inc);
 998
 999 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
1000 {
1001         int relalign = 0;
1002
1003         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
1004                 int size = sizeof(unsigned long);
1005                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1006                          ((unsigned long)dst ^ (unsigned long)src2)) &
1007                         (size - 1);
1008
1009                 relalign = d ? 1 << __ffs(d) : size;
1010
1011                 /*
1012                  * If we care about alignment, process as many bytes as
1013                  * needed to advance dst and src to values whose alignments
1014                  * equal their relative alignment. This will allow us to
1015                  * process the remainder of the input using optimal strides.
1016                  */
1017                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1018                         *dst++ = *src1++ ^ *src2++;
1019                         len--;
1020                 }
1021         }
1022
1023         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1024                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1025                 dst += 8;
1026                 src1 += 8;
1027                 src2 += 8;
1028                 len -= 8;
1029         }
1030
1031         while (len >= 4 && !(relalign & 3)) {
1032                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1033                 dst += 4;
1034                 src1 += 4;
1035                 src2 += 4;
1036                 len -= 4;
1037         }
1038
1039         while (len >= 2 && !(relalign & 1)) {
1040                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1041                 dst += 2;
1042                 src1 += 2;
1043                 src2 += 2;
1044                 len -= 2;
1045         }
1046
1047         while (len--)
1048                 *dst++ = *src1++ ^ *src2++;
1049 }
1050 EXPORT_SYMBOL_GPL(__crypto_xor);
1051
1052 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1053 {
1054         return alg->cra_ctxsize +
1055                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1056 }
1057 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1058
1059 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1060                         u32 type, u32 mask)
1061 {
1062         int ret = 0;
1063         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1064
1065         if (!IS_ERR(alg)) {
1066                 crypto_mod_put(alg);
1067                 ret = 1;
1068         }
1069
1070         return ret;
1071 }
1072 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1073
1074 #ifdef CONFIG_CRYPTO_STATS
1075 void crypto_stats_init(struct crypto_alg *alg)
1076 {
1077         memset(&alg->stats, 0, sizeof(alg->stats));
1078 }
1079 EXPORT_SYMBOL_GPL(crypto_stats_init);
1080
1081 void crypto_stats_get(struct crypto_alg *alg)
1082 {
1083         crypto_alg_get(alg);
1084 }
1085 EXPORT_SYMBOL_GPL(crypto_stats_get);
1086
1087 void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1088                                      struct crypto_alg *alg)
1089 {
1090         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1091                 atomic64_inc(&alg->stats.cipher.err_cnt);
1092         } else {
1093                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1094                 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1095         }
1096         crypto_alg_put(alg);
1097 }
1098 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1099
1100 void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1101                                      struct crypto_alg *alg)
1102 {
1103         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1104                 atomic64_inc(&alg->stats.cipher.err_cnt);
1105         } else {
1106                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1107                 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1108         }
1109         crypto_alg_put(alg);
1110 }
1111 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1112
1113 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1114                                int ret)
1115 {
1116         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1117                 atomic64_inc(&alg->stats.aead.err_cnt);
1118         } else {
1119                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1120                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1121         }
1122         crypto_alg_put(alg);
1123 }
1124 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1125
1126 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1127                                int ret)
1128 {
1129         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1130                 atomic64_inc(&alg->stats.aead.err_cnt);
1131         } else {
1132                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1133                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1134         }
1135         crypto_alg_put(alg);
1136 }
1137 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1138
1139 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1140                                    struct crypto_alg *alg)
1141 {
1142         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1143                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1144         } else {
1145                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1146                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1147         }
1148         crypto_alg_put(alg);
1149 }
1150 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1151
1152 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1153                                    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.decrypt_cnt);
1159                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1160         }
1161         crypto_alg_put(alg);
1162 }
1163 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1164
1165 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1166 {
1167         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1168                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1169         else
1170                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1171         crypto_alg_put(alg);
1172 }
1173 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1174
1175 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1176 {
1177         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1178                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1179         else
1180                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1181         crypto_alg_put(alg);
1182 }
1183 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1184
1185 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1186 {
1187         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1188                 atomic64_inc(&alg->stats.compress.err_cnt);
1189         } else {
1190                 atomic64_inc(&alg->stats.compress.compress_cnt);
1191                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1192         }
1193         crypto_alg_put(alg);
1194 }
1195 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1196
1197 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1198 {
1199         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1200                 atomic64_inc(&alg->stats.compress.err_cnt);
1201         } else {
1202                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1203                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1204         }
1205         crypto_alg_put(alg);
1206 }
1207 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1208
1209 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1210                                struct crypto_alg *alg)
1211 {
1212         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1213                 atomic64_inc(&alg->stats.hash.err_cnt);
1214         else
1215                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1216         crypto_alg_put(alg);
1217 }
1218 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1219
1220 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1221                               struct crypto_alg *alg)
1222 {
1223         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1224                 atomic64_inc(&alg->stats.hash.err_cnt);
1225         } else {
1226                 atomic64_inc(&alg->stats.hash.hash_cnt);
1227                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1228         }
1229         crypto_alg_put(alg);
1230 }
1231 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1232
1233 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1234 {
1235         if (ret)
1236                 atomic64_inc(&alg->stats.kpp.err_cnt);
1237         else
1238                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1239         crypto_alg_put(alg);
1240 }
1241 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1242
1243 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1244 {
1245         if (ret)
1246                 atomic64_inc(&alg->stats.kpp.err_cnt);
1247         else
1248                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1249         crypto_alg_put(alg);
1250 }
1251 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1252
1253 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1254 {
1255         if (ret)
1256                 atomic64_inc(&alg->stats.kpp.err_cnt);
1257         else
1258                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1259         crypto_alg_put(alg);
1260 }
1261 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1262
1263 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1264 {
1265         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1266                 atomic64_inc(&alg->stats.rng.err_cnt);
1267         else
1268                 atomic64_inc(&alg->stats.rng.seed_cnt);
1269         crypto_alg_put(alg);
1270 }
1271 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1272
1273 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1274                                int ret)
1275 {
1276         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1277                 atomic64_inc(&alg->stats.rng.err_cnt);
1278         } else {
1279                 atomic64_inc(&alg->stats.rng.generate_cnt);
1280                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1281         }
1282         crypto_alg_put(alg);
1283 }
1284 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1285
1286 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1287                                    struct crypto_alg *alg)
1288 {
1289         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1290                 atomic64_inc(&alg->stats.cipher.err_cnt);
1291         } else {
1292                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1293                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1294         }
1295         crypto_alg_put(alg);
1296 }
1297 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1298
1299 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1300                                    struct crypto_alg *alg)
1301 {
1302         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1303                 atomic64_inc(&alg->stats.cipher.err_cnt);
1304         } else {
1305                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1306                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1307         }
1308         crypto_alg_put(alg);
1309 }
1310 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1311 #endif
1312
1313 static int __init crypto_algapi_init(void)
1314 {
1315         crypto_init_proc();
1316         return 0;
1317 }
1318
1319 static void __exit crypto_algapi_exit(void)
1320 {
1321         crypto_exit_proc();
1322 }
1323
1324 module_init(crypto_algapi_init);
1325 module_exit(crypto_algapi_exit);
1326
1327 MODULE_LICENSE("GPL");
1328 MODULE_DESCRIPTION("Cryptographic algorithms API");