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 #ifdef CONFIG_CRYPTO_STATS
 262         memset(&alg->stats, 0, sizeof(alg->stats));
 263 #endif
 264
 265 out:
 266         return larval;
 267
 268 free_larval:
 269         kfree(larval);
 270 err:
 271         larval = ERR_PTR(ret);
 272         goto out;
 273 }
 274
 275 void crypto_alg_tested(const char *name, int err)
 276 {
 277         struct crypto_larval *test;
 278         struct crypto_alg *alg;
 279         struct crypto_alg *q;
 280         LIST_HEAD(list);
 281
 282         down_write(&crypto_alg_sem);
 283         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 284                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 285                         continue;
 286
 287                 test = (struct crypto_larval *)q;
 288
 289                 if (!strcmp(q->cra_driver_name, name))
 290                         goto found;
 291         }
 292
 293         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 294         goto unlock;
 295
 296 found:
 297         q->cra_flags |= CRYPTO_ALG_DEAD;
 298         alg = test->adult;
 299         if (err || list_empty(&alg->cra_list))
 300                 goto complete;
 301
 302         alg->cra_flags |= CRYPTO_ALG_TESTED;
 303
 304         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 305                 if (q == alg)
 306                         continue;
 307
 308                 if (crypto_is_moribund(q))
 309                         continue;
 310
 311                 if (crypto_is_larval(q)) {
 312                         struct crypto_larval *larval = (void *)q;
 313
 314                         /*
 315                          * Check to see if either our generic name or
 316                          * specific name can satisfy the name requested
 317                          * by the larval entry q.
 318                          */
 319                         if (strcmp(alg->cra_name, q->cra_name) &&
 320                             strcmp(alg->cra_driver_name, q->cra_name))
 321                                 continue;
 322
 323                         if (larval->adult)
 324                                 continue;
 325                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 326                                 continue;
 327                         if (!crypto_mod_get(alg))
 328                                 continue;
 329
 330                         larval->adult = alg;
 331                         continue;
 332                 }
 333
 334                 if (strcmp(alg->cra_name, q->cra_name))
 335                         continue;
 336
 337                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 338                     q->cra_priority > alg->cra_priority)
 339                         continue;
 340
 341                 crypto_remove_spawns(q, &list, alg);
 342         }
 343
 344 complete:
 345         complete_all(&test->completion);
 346
 347 unlock:
 348         up_write(&crypto_alg_sem);
 349
 350         crypto_remove_final(&list);
 351 }
 352 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 353
 354 void crypto_remove_final(struct list_head *list)
 355 {
 356         struct crypto_alg *alg;
 357         struct crypto_alg *n;
 358
 359         list_for_each_entry_safe(alg, n, list, cra_list) {
 360                 list_del_init(&alg->cra_list);
 361                 crypto_alg_put(alg);
 362         }
 363 }
 364 EXPORT_SYMBOL_GPL(crypto_remove_final);
 365
 366 static void crypto_wait_for_test(struct crypto_larval *larval)
 367 {
 368         int err;
 369
 370         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 371         if (err != NOTIFY_STOP) {
 372                 if (WARN_ON(err != NOTIFY_DONE))
 373                         goto out;
 374                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 375         }
 376
 377         err = wait_for_completion_killable(&larval->completion);
 378         WARN_ON(err);
 379         if (!err)
 380                 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
 381
 382 out:
 383         crypto_larval_kill(&larval->alg);
 384 }
 385
 386 int crypto_register_alg(struct crypto_alg *alg)
 387 {
 388         struct crypto_larval *larval;
 389         int err;
 390
 391         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 392         err = crypto_check_alg(alg);
 393         if (err)
 394                 return err;
 395
 396         down_write(&crypto_alg_sem);
 397         larval = __crypto_register_alg(alg);
 398         up_write(&crypto_alg_sem);
 399
 400         if (IS_ERR(larval))
 401                 return PTR_ERR(larval);
 402
 403         crypto_wait_for_test(larval);
 404         return 0;
 405 }
 406 EXPORT_SYMBOL_GPL(crypto_register_alg);
 407
 408 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 409 {
 410         if (unlikely(list_empty(&alg->cra_list)))
 411                 return -ENOENT;
 412
 413         alg->cra_flags |= CRYPTO_ALG_DEAD;
 414
 415         list_del_init(&alg->cra_list);
 416         crypto_remove_spawns(alg, list, NULL);
 417
 418         return 0;
 419 }
 420
 421 int crypto_unregister_alg(struct crypto_alg *alg)
 422 {
 423         int ret;
 424         LIST_HEAD(list);
 425
 426         down_write(&crypto_alg_sem);
 427         ret = crypto_remove_alg(alg, &list);
 428         up_write(&crypto_alg_sem);
 429
 430         if (ret)
 431                 return ret;
 432
 433         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 434         if (alg->cra_destroy)
 435                 alg->cra_destroy(alg);
 436
 437         crypto_remove_final(&list);
 438         return 0;
 439 }
 440 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 441
 442 int crypto_register_algs(struct crypto_alg *algs, int count)
 443 {
 444         int i, ret;
 445
 446         for (i = 0; i < count; i++) {
 447                 ret = crypto_register_alg(&algs[i]);
 448                 if (ret)
 449                         goto err;
 450         }
 451
 452         return 0;
 453
 454 err:
 455         for (--i; i >= 0; --i)
 456                 crypto_unregister_alg(&algs[i]);
 457
 458         return ret;
 459 }
 460 EXPORT_SYMBOL_GPL(crypto_register_algs);
 461
 462 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 463 {
 464         int i, ret;
 465
 466         for (i = 0; i < count; i++) {
 467                 ret = crypto_unregister_alg(&algs[i]);
 468                 if (ret)
 469                         pr_err("Failed to unregister %s %s: %d\n",
 470                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 471         }
 472
 473         return 0;
 474 }
 475 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 476
 477 int crypto_register_template(struct crypto_template *tmpl)
 478 {
 479         struct crypto_template *q;
 480         int err = -EEXIST;
 481
 482         down_write(&crypto_alg_sem);
 483
 484         crypto_check_module_sig(tmpl->module);
 485
 486         list_for_each_entry(q, &crypto_template_list, list) {
 487                 if (q == tmpl)
 488                         goto out;
 489         }
 490
 491         list_add(&tmpl->list, &crypto_template_list);
 492         err = 0;
 493 out:
 494         up_write(&crypto_alg_sem);
 495         return err;
 496 }
 497 EXPORT_SYMBOL_GPL(crypto_register_template);
 498
 499 void crypto_unregister_template(struct crypto_template *tmpl)
 500 {
 501         struct crypto_instance *inst;
 502         struct hlist_node *n;
 503         struct hlist_head *list;
 504         LIST_HEAD(users);
 505
 506         down_write(&crypto_alg_sem);
 507
 508         BUG_ON(list_empty(&tmpl->list));
 509         list_del_init(&tmpl->list);
 510
 511         list = &tmpl->instances;
 512         hlist_for_each_entry(inst, list, list) {
 513                 int err = crypto_remove_alg(&inst->alg, &users);
 514
 515                 BUG_ON(err);
 516         }
 517
 518         up_write(&crypto_alg_sem);
 519
 520         hlist_for_each_entry_safe(inst, n, list, list) {
 521                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 522                 crypto_free_instance(inst);
 523         }
 524         crypto_remove_final(&users);
 525 }
 526 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 527
 528 static struct crypto_template *__crypto_lookup_template(const char *name)
 529 {
 530         struct crypto_template *q, *tmpl = NULL;
 531
 532         down_read(&crypto_alg_sem);
 533         list_for_each_entry(q, &crypto_template_list, list) {
 534                 if (strcmp(q->name, name))
 535                         continue;
 536                 if (unlikely(!crypto_tmpl_get(q)))
 537                         continue;
 538
 539                 tmpl = q;
 540                 break;
 541         }
 542         up_read(&crypto_alg_sem);
 543
 544         return tmpl;
 545 }
 546
 547 struct crypto_template *crypto_lookup_template(const char *name)
 548 {
 549         return try_then_request_module(__crypto_lookup_template(name),
 550                                        "crypto-%s", name);
 551 }
 552 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 553
 554 int crypto_register_instance(struct crypto_template *tmpl,
 555                              struct crypto_instance *inst)
 556 {
 557         struct crypto_larval *larval;
 558         int err;
 559
 560         err = crypto_check_alg(&inst->alg);
 561         if (err)
 562                 return err;
 563
 564         inst->alg.cra_module = tmpl->module;
 565         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 566
 567         down_write(&crypto_alg_sem);
 568
 569         larval = __crypto_register_alg(&inst->alg);
 570         if (IS_ERR(larval))
 571                 goto unlock;
 572
 573         hlist_add_head(&inst->list, &tmpl->instances);
 574         inst->tmpl = tmpl;
 575
 576 unlock:
 577         up_write(&crypto_alg_sem);
 578
 579         err = PTR_ERR(larval);
 580         if (IS_ERR(larval))
 581                 goto err;
 582
 583         crypto_wait_for_test(larval);
 584         err = 0;
 585
 586 err:
 587         return err;
 588 }
 589 EXPORT_SYMBOL_GPL(crypto_register_instance);
 590
 591 int crypto_unregister_instance(struct crypto_instance *inst)
 592 {
 593         LIST_HEAD(list);
 594
 595         down_write(&crypto_alg_sem);
 596
 597         crypto_remove_spawns(&inst->alg, &list, NULL);
 598         crypto_remove_instance(inst, &list);
 599
 600         up_write(&crypto_alg_sem);
 601
 602         crypto_remove_final(&list);
 603
 604         return 0;
 605 }
 606 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 607
 608 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 609                       struct crypto_instance *inst, u32 mask)
 610 {
 611         int err = -EAGAIN;
 612
 613         spawn->inst = inst;
 614         spawn->mask = mask;
 615
 616         down_write(&crypto_alg_sem);
 617         if (!crypto_is_moribund(alg)) {
 618                 list_add(&spawn->list, &alg->cra_users);
 619                 spawn->alg = alg;
 620                 err = 0;
 621         }
 622         up_write(&crypto_alg_sem);
 623
 624         return err;
 625 }
 626 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 627
 628 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 629                        struct crypto_instance *inst,
 630                        const struct crypto_type *frontend)
 631 {
 632         int err = -EINVAL;
 633
 634         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 635                 goto out;
 636
 637         spawn->frontend = frontend;
 638         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 639
 640 out:
 641         return err;
 642 }
 643 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 644
 645 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 646                       u32 type, u32 mask)
 647 {
 648         struct crypto_alg *alg;
 649         int err;
 650
 651         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 652         if (IS_ERR(alg))
 653                 return PTR_ERR(alg);
 654
 655         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 656         crypto_mod_put(alg);
 657         return err;
 658 }
 659 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 660
 661 void crypto_drop_spawn(struct crypto_spawn *spawn)
 662 {
 663         if (!spawn->alg)
 664                 return;
 665
 666         down_write(&crypto_alg_sem);
 667         list_del(&spawn->list);
 668         up_write(&crypto_alg_sem);
 669 }
 670 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 671
 672 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 673 {
 674         struct crypto_alg *alg;
 675         struct crypto_alg *alg2;
 676
 677         down_read(&crypto_alg_sem);
 678         alg = spawn->alg;
 679         alg2 = alg;
 680         if (alg2)
 681                 alg2 = crypto_mod_get(alg2);
 682         up_read(&crypto_alg_sem);
 683
 684         if (!alg2) {
 685                 if (alg)
 686                         crypto_shoot_alg(alg);
 687                 return ERR_PTR(-EAGAIN);
 688         }
 689
 690         return alg;
 691 }
 692
 693 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 694                                     u32 mask)
 695 {
 696         struct crypto_alg *alg;
 697         struct crypto_tfm *tfm;
 698
 699         alg = crypto_spawn_alg(spawn);
 700         if (IS_ERR(alg))
 701                 return ERR_CAST(alg);
 702
 703         tfm = ERR_PTR(-EINVAL);
 704         if (unlikely((alg->cra_flags ^ type) & mask))
 705                 goto out_put_alg;
 706
 707         tfm = __crypto_alloc_tfm(alg, type, mask);
 708         if (IS_ERR(tfm))
 709                 goto out_put_alg;
 710
 711         return tfm;
 712
 713 out_put_alg:
 714         crypto_mod_put(alg);
 715         return tfm;
 716 }
 717 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 718
 719 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 720 {
 721         struct crypto_alg *alg;
 722         struct crypto_tfm *tfm;
 723
 724         alg = crypto_spawn_alg(spawn);
 725         if (IS_ERR(alg))
 726                 return ERR_CAST(alg);
 727
 728         tfm = crypto_create_tfm(alg, spawn->frontend);
 729         if (IS_ERR(tfm))
 730                 goto out_put_alg;
 731
 732         return tfm;
 733
 734 out_put_alg:
 735         crypto_mod_put(alg);
 736         return tfm;
 737 }
 738 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 739
 740 int crypto_register_notifier(struct notifier_block *nb)
 741 {
 742         return blocking_notifier_chain_register(&crypto_chain, nb);
 743 }
 744 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 745
 746 int crypto_unregister_notifier(struct notifier_block *nb)
 747 {
 748         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 749 }
 750 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 751
 752 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 753 {
 754         struct rtattr *rta = tb[0];
 755         struct crypto_attr_type *algt;
 756
 757         if (!rta)
 758                 return ERR_PTR(-ENOENT);
 759         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 760                 return ERR_PTR(-EINVAL);
 761         if (rta->rta_type != CRYPTOA_TYPE)
 762                 return ERR_PTR(-EINVAL);
 763
 764         algt = RTA_DATA(rta);
 765
 766         return algt;
 767 }
 768 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 769
 770 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 771 {
 772         struct crypto_attr_type *algt;
 773
 774         algt = crypto_get_attr_type(tb);
 775         if (IS_ERR(algt))
 776                 return PTR_ERR(algt);
 777
 778         if ((algt->type ^ type) & algt->mask)
 779                 return -EINVAL;
 780
 781         return 0;
 782 }
 783 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 784
 785 const char *crypto_attr_alg_name(struct rtattr *rta)
 786 {
 787         struct crypto_attr_alg *alga;
 788
 789         if (!rta)
 790                 return ERR_PTR(-ENOENT);
 791         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 792                 return ERR_PTR(-EINVAL);
 793         if (rta->rta_type != CRYPTOA_ALG)
 794                 return ERR_PTR(-EINVAL);
 795
 796         alga = RTA_DATA(rta);
 797         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 798
 799         return alga->name;
 800 }
 801 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 802
 803 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 804                                     const struct crypto_type *frontend,
 805                                     u32 type, u32 mask)
 806 {
 807         const char *name;
 808
 809         name = crypto_attr_alg_name(rta);
 810         if (IS_ERR(name))
 811                 return ERR_CAST(name);
 812
 813         return crypto_find_alg(name, frontend, type, mask);
 814 }
 815 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 816
 817 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 818 {
 819         struct crypto_attr_u32 *nu32;
 820
 821         if (!rta)
 822                 return -ENOENT;
 823         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 824                 return -EINVAL;
 825         if (rta->rta_type != CRYPTOA_U32)
 826                 return -EINVAL;
 827
 828         nu32 = RTA_DATA(rta);
 829         *num = nu32->num;
 830
 831         return 0;
 832 }
 833 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 834
 835 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 836                         struct crypto_alg *alg)
 837 {
 838         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 839                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 840                 return -ENAMETOOLONG;
 841
 842         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 843                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 844                 return -ENAMETOOLONG;
 845
 846         return 0;
 847 }
 848 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 849
 850 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 851                              unsigned int head)
 852 {
 853         struct crypto_instance *inst;
 854         char *p;
 855         int err;
 856
 857         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 858                     GFP_KERNEL);
 859         if (!p)
 860                 return ERR_PTR(-ENOMEM);
 861
 862         inst = (void *)(p + head);
 863
 864         err = crypto_inst_setname(inst, name, alg);
 865         if (err)
 866                 goto err_free_inst;
 867
 868         return p;
 869
 870 err_free_inst:
 871         kfree(p);
 872         return ERR_PTR(err);
 873 }
 874 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 875
 876 struct crypto_instance *crypto_alloc_instance(const char *name,
 877                                               struct crypto_alg *alg)
 878 {
 879         struct crypto_instance *inst;
 880         struct crypto_spawn *spawn;
 881         int err;
 882
 883         inst = crypto_alloc_instance2(name, alg, 0);
 884         if (IS_ERR(inst))
 885                 goto out;
 886
 887         spawn = crypto_instance_ctx(inst);
 888         err = crypto_init_spawn(spawn, alg, inst,
 889                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 890
 891         if (err)
 892                 goto err_free_inst;
 893
 894         return inst;
 895
 896 err_free_inst:
 897         kfree(inst);
 898         inst = ERR_PTR(err);
 899
 900 out:
 901         return inst;
 902 }
 903 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 904
 905 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 906 {
 907         INIT_LIST_HEAD(&queue->list);
 908         queue->backlog = &queue->list;
 909         queue->qlen = 0;
 910         queue->max_qlen = max_qlen;
 911 }
 912 EXPORT_SYMBOL_GPL(crypto_init_queue);
 913
 914 int crypto_enqueue_request(struct crypto_queue *queue,
 915                            struct crypto_async_request *request)
 916 {
 917         int err = -EINPROGRESS;
 918
 919         if (unlikely(queue->qlen >= queue->max_qlen)) {
 920                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 921                         err = -ENOSPC;
 922                         goto out;
 923                 }
 924                 err = -EBUSY;
 925                 if (queue->backlog == &queue->list)
 926                         queue->backlog = &request->list;
 927         }
 928
 929         queue->qlen++;
 930         list_add_tail(&request->list, &queue->list);
 931
 932 out:
 933         return err;
 934 }
 935 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 936
 937 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 938 {
 939         struct list_head *request;
 940
 941         if (unlikely(!queue->qlen))
 942                 return NULL;
 943
 944         queue->qlen--;
 945
 946         if (queue->backlog != &queue->list)
 947                 queue->backlog = queue->backlog->next;
 948
 949         request = queue->list.next;
 950         list_del(request);
 951
 952         return list_entry(request, struct crypto_async_request, list);
 953 }
 954 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 955
 956 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 957 {
 958         struct crypto_async_request *req;
 959
 960         list_for_each_entry(req, &queue->list, list) {
 961                 if (req->tfm == tfm)
 962                         return 1;
 963         }
 964
 965         return 0;
 966 }
 967 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 968
 969 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 970 {
 971         u8 *b = (a + size);
 972         u8 c;
 973
 974         for (; size; size--) {
 975                 c = *--b + 1;
 976                 *b = c;
 977                 if (c)
 978                         break;
 979         }
 980 }
 981
 982 void crypto_inc(u8 *a, unsigned int size)
 983 {
 984         __be32 *b = (__be32 *)(a + size);
 985         u32 c;
 986
 987         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 988             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 989                 for (; size >= 4; size -= 4) {
 990                         c = be32_to_cpu(*--b) + 1;
 991                         *b = cpu_to_be32(c);
 992                         if (likely(c))
 993                                 return;
 994                 }
 995
 996         crypto_inc_byte(a, size);
 997 }
 998 EXPORT_SYMBOL_GPL(crypto_inc);
 999
1000 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
1001 {
1002         int relalign = 0;
1003
1004         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
1005                 int size = sizeof(unsigned long);
1006                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1007                          ((unsigned long)dst ^ (unsigned long)src2)) &
1008                         (size - 1);
1009
1010                 relalign = d ? 1 << __ffs(d) : size;
1011
1012                 /*
1013                  * If we care about alignment, process as many bytes as
1014                  * needed to advance dst and src to values whose alignments
1015                  * equal their relative alignment. This will allow us to
1016                  * process the remainder of the input using optimal strides.
1017                  */
1018                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1019                         *dst++ = *src1++ ^ *src2++;
1020                         len--;
1021                 }
1022         }
1023
1024         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1025                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1026                 dst += 8;
1027                 src1 += 8;
1028                 src2 += 8;
1029                 len -= 8;
1030         }
1031
1032         while (len >= 4 && !(relalign & 3)) {
1033                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1034                 dst += 4;
1035                 src1 += 4;
1036                 src2 += 4;
1037                 len -= 4;
1038         }
1039
1040         while (len >= 2 && !(relalign & 1)) {
1041                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1042                 dst += 2;
1043                 src1 += 2;
1044                 src2 += 2;
1045                 len -= 2;
1046         }
1047
1048         while (len--)
1049                 *dst++ = *src1++ ^ *src2++;
1050 }
1051 EXPORT_SYMBOL_GPL(__crypto_xor);
1052
1053 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1054 {
1055         return alg->cra_ctxsize +
1056                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1057 }
1058 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1059
1060 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1061                         u32 type, u32 mask)
1062 {
1063         int ret = 0;
1064         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1065
1066         if (!IS_ERR(alg)) {
1067                 crypto_mod_put(alg);
1068                 ret = 1;
1069         }
1070
1071         return ret;
1072 }
1073 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1074
1075 #ifdef CONFIG_CRYPTO_STATS
1076 void crypto_stats_get(struct crypto_alg *alg)
1077 {
1078         crypto_alg_get(alg);
1079 }
1080 EXPORT_SYMBOL_GPL(crypto_stats_get);
1081
1082 void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1083                                      struct crypto_alg *alg)
1084 {
1085         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1086                 atomic64_inc(&alg->stats.cipher.cipher_err_cnt);
1087         } else {
1088                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1089                 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1090         }
1091         crypto_alg_put(alg);
1092 }
1093 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1094
1095 void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1096                                      struct crypto_alg *alg)
1097 {
1098         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1099                 atomic64_inc(&alg->stats.cipher.cipher_err_cnt);
1100         } else {
1101                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1102                 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1103         }
1104         crypto_alg_put(alg);
1105 }
1106 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1107
1108 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1109                                int ret)
1110 {
1111         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1112                 atomic64_inc(&alg->stats.aead.aead_err_cnt);
1113         } else {
1114                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1115                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1116         }
1117         crypto_alg_put(alg);
1118 }
1119 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1120
1121 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1122                                int ret)
1123 {
1124         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1125                 atomic64_inc(&alg->stats.aead.aead_err_cnt);
1126         } else {
1127                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1128                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1129         }
1130         crypto_alg_put(alg);
1131 }
1132 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1133
1134 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1135                                    struct crypto_alg *alg)
1136 {
1137         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1138                 atomic64_inc(&alg->stats.akcipher.akcipher_err_cnt);
1139         } else {
1140                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1141                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1142         }
1143         crypto_alg_put(alg);
1144 }
1145 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1146
1147 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1148                                    struct crypto_alg *alg)
1149 {
1150         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1151                 atomic64_inc(&alg->stats.akcipher.akcipher_err_cnt);
1152         } else {
1153                 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1154                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1155         }
1156         crypto_alg_put(alg);
1157 }
1158 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1159
1160 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1161 {
1162         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1163                 atomic64_inc(&alg->stats.akcipher.akcipher_err_cnt);
1164         else
1165                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1166         crypto_alg_put(alg);
1167 }
1168 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1169
1170 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1171 {
1172         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1173                 atomic64_inc(&alg->stats.akcipher.akcipher_err_cnt);
1174         else
1175                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1176         crypto_alg_put(alg);
1177 }
1178 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1179
1180 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1181 {
1182         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1183                 atomic64_inc(&alg->stats.compress.compress_err_cnt);
1184         } else {
1185                 atomic64_inc(&alg->stats.compress.compress_cnt);
1186                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1187         }
1188         crypto_alg_put(alg);
1189 }
1190 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1191
1192 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1193 {
1194         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1195                 atomic64_inc(&alg->stats.compress.compress_err_cnt);
1196         } else {
1197                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1198                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1199         }
1200         crypto_alg_put(alg);
1201 }
1202 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1203
1204 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1205                                struct crypto_alg *alg)
1206 {
1207         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1208                 atomic64_inc(&alg->stats.hash.hash_err_cnt);
1209         else
1210                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1211         crypto_alg_put(alg);
1212 }
1213 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1214
1215 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1216                               struct crypto_alg *alg)
1217 {
1218         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1219                 atomic64_inc(&alg->stats.hash.hash_err_cnt);
1220         } else {
1221                 atomic64_inc(&alg->stats.hash.hash_cnt);
1222                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1223         }
1224         crypto_alg_put(alg);
1225 }
1226 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1227
1228 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1229 {
1230         if (ret)
1231                 atomic64_inc(&alg->stats.kpp.kpp_err_cnt);
1232         else
1233                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1234         crypto_alg_put(alg);
1235 }
1236 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1237
1238 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1239 {
1240         if (ret)
1241                 atomic64_inc(&alg->stats.kpp.kpp_err_cnt);
1242         else
1243                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1244         crypto_alg_put(alg);
1245 }
1246 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1247
1248 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1249 {
1250         if (ret)
1251                 atomic64_inc(&alg->stats.kpp.kpp_err_cnt);
1252         else
1253                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1254         crypto_alg_put(alg);
1255 }
1256 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1257
1258 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1259 {
1260         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1261                 atomic64_inc(&alg->stats.rng.rng_err_cnt);
1262         else
1263                 atomic64_inc(&alg->stats.rng.seed_cnt);
1264         crypto_alg_put(alg);
1265 }
1266 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1267
1268 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1269                                int ret)
1270 {
1271         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1272                 atomic64_inc(&alg->stats.rng.rng_err_cnt);
1273         } else {
1274                 atomic64_inc(&alg->stats.rng.generate_cnt);
1275                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1276         }
1277         crypto_alg_put(alg);
1278 }
1279 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1280
1281 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1282                                    struct crypto_alg *alg)
1283 {
1284         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1285                 atomic64_inc(&alg->stats.cipher.cipher_err_cnt);
1286         } else {
1287                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1288                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1289         }
1290         crypto_alg_put(alg);
1291 }
1292 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1293
1294 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1295                                    struct crypto_alg *alg)
1296 {
1297         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1298                 atomic64_inc(&alg->stats.cipher.cipher_err_cnt);
1299         } else {
1300                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1301                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1302         }
1303         crypto_alg_put(alg);
1304 }
1305 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1306 #endif
1307
1308 static int __init crypto_algapi_init(void)
1309 {
1310         crypto_init_proc();
1311         return 0;
1312 }
1313
1314 static void __exit crypto_algapi_exit(void)
1315 {
1316         crypto_exit_proc();
1317 }
1318
1319 module_init(crypto_algapi_init);
1320 module_exit(crypto_algapi_exit);
1321
1322 MODULE_LICENSE("GPL");
1323 MODULE_DESCRIPTION("Cryptographic algorithms API");