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 void crypto_unregister_template(struct crypto_template *tmpl)
 498 {
 499         struct crypto_instance *inst;
 500         struct hlist_node *n;
 501         struct hlist_head *list;
 502         LIST_HEAD(users);
 503
 504         down_write(&crypto_alg_sem);
 505
 506         BUG_ON(list_empty(&tmpl->list));
 507         list_del_init(&tmpl->list);
 508
 509         list = &tmpl->instances;
 510         hlist_for_each_entry(inst, list, list) {
 511                 int err = crypto_remove_alg(&inst->alg, &users);
 512
 513                 BUG_ON(err);
 514         }
 515
 516         up_write(&crypto_alg_sem);
 517
 518         hlist_for_each_entry_safe(inst, n, list, list) {
 519                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 520                 crypto_free_instance(inst);
 521         }
 522         crypto_remove_final(&users);
 523 }
 524 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 525
 526 static struct crypto_template *__crypto_lookup_template(const char *name)
 527 {
 528         struct crypto_template *q, *tmpl = NULL;
 529
 530         down_read(&crypto_alg_sem);
 531         list_for_each_entry(q, &crypto_template_list, list) {
 532                 if (strcmp(q->name, name))
 533                         continue;
 534                 if (unlikely(!crypto_tmpl_get(q)))
 535                         continue;
 536
 537                 tmpl = q;
 538                 break;
 539         }
 540         up_read(&crypto_alg_sem);
 541
 542         return tmpl;
 543 }
 544
 545 struct crypto_template *crypto_lookup_template(const char *name)
 546 {
 547         return try_then_request_module(__crypto_lookup_template(name),
 548                                        "crypto-%s", name);
 549 }
 550 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 551
 552 int crypto_register_instance(struct crypto_template *tmpl,
 553                              struct crypto_instance *inst)
 554 {
 555         struct crypto_larval *larval;
 556         int err;
 557
 558         err = crypto_check_alg(&inst->alg);
 559         if (err)
 560                 return err;
 561
 562         inst->alg.cra_module = tmpl->module;
 563         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 564
 565         down_write(&crypto_alg_sem);
 566
 567         larval = __crypto_register_alg(&inst->alg);
 568         if (IS_ERR(larval))
 569                 goto unlock;
 570
 571         hlist_add_head(&inst->list, &tmpl->instances);
 572         inst->tmpl = tmpl;
 573
 574 unlock:
 575         up_write(&crypto_alg_sem);
 576
 577         err = PTR_ERR(larval);
 578         if (IS_ERR(larval))
 579                 goto err;
 580
 581         crypto_wait_for_test(larval);
 582         err = 0;
 583
 584 err:
 585         return err;
 586 }
 587 EXPORT_SYMBOL_GPL(crypto_register_instance);
 588
 589 int crypto_unregister_instance(struct crypto_instance *inst)
 590 {
 591         LIST_HEAD(list);
 592
 593         down_write(&crypto_alg_sem);
 594
 595         crypto_remove_spawns(&inst->alg, &list, NULL);
 596         crypto_remove_instance(inst, &list);
 597
 598         up_write(&crypto_alg_sem);
 599
 600         crypto_remove_final(&list);
 601
 602         return 0;
 603 }
 604 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 605
 606 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 607                       struct crypto_instance *inst, u32 mask)
 608 {
 609         int err = -EAGAIN;
 610
 611         if (WARN_ON_ONCE(inst == NULL))
 612                 return -EINVAL;
 613
 614         spawn->inst = inst;
 615         spawn->mask = mask;
 616
 617         down_write(&crypto_alg_sem);
 618         if (!crypto_is_moribund(alg)) {
 619                 list_add(&spawn->list, &alg->cra_users);
 620                 spawn->alg = alg;
 621                 err = 0;
 622         }
 623         up_write(&crypto_alg_sem);
 624
 625         return err;
 626 }
 627 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 628
 629 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 630                        struct crypto_instance *inst,
 631                        const struct crypto_type *frontend)
 632 {
 633         int err = -EINVAL;
 634
 635         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 636                 goto out;
 637
 638         spawn->frontend = frontend;
 639         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 640
 641 out:
 642         return err;
 643 }
 644 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 645
 646 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 647                       u32 type, u32 mask)
 648 {
 649         struct crypto_alg *alg;
 650         int err;
 651
 652         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 653         if (IS_ERR(alg))
 654                 return PTR_ERR(alg);
 655
 656         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 657         crypto_mod_put(alg);
 658         return err;
 659 }
 660 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 661
 662 void crypto_drop_spawn(struct crypto_spawn *spawn)
 663 {
 664         if (!spawn->alg)
 665                 return;
 666
 667         down_write(&crypto_alg_sem);
 668         list_del(&spawn->list);
 669         up_write(&crypto_alg_sem);
 670 }
 671 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 672
 673 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 674 {
 675         struct crypto_alg *alg;
 676         struct crypto_alg *alg2;
 677
 678         down_read(&crypto_alg_sem);
 679         alg = spawn->alg;
 680         alg2 = alg;
 681         if (alg2)
 682                 alg2 = crypto_mod_get(alg2);
 683         up_read(&crypto_alg_sem);
 684
 685         if (!alg2) {
 686                 if (alg)
 687                         crypto_shoot_alg(alg);
 688                 return ERR_PTR(-EAGAIN);
 689         }
 690
 691         return alg;
 692 }
 693
 694 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 695                                     u32 mask)
 696 {
 697         struct crypto_alg *alg;
 698         struct crypto_tfm *tfm;
 699
 700         alg = crypto_spawn_alg(spawn);
 701         if (IS_ERR(alg))
 702                 return ERR_CAST(alg);
 703
 704         tfm = ERR_PTR(-EINVAL);
 705         if (unlikely((alg->cra_flags ^ type) & mask))
 706                 goto out_put_alg;
 707
 708         tfm = __crypto_alloc_tfm(alg, type, mask);
 709         if (IS_ERR(tfm))
 710                 goto out_put_alg;
 711
 712         return tfm;
 713
 714 out_put_alg:
 715         crypto_mod_put(alg);
 716         return tfm;
 717 }
 718 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 719
 720 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 721 {
 722         struct crypto_alg *alg;
 723         struct crypto_tfm *tfm;
 724
 725         alg = crypto_spawn_alg(spawn);
 726         if (IS_ERR(alg))
 727                 return ERR_CAST(alg);
 728
 729         tfm = crypto_create_tfm(alg, spawn->frontend);
 730         if (IS_ERR(tfm))
 731                 goto out_put_alg;
 732
 733         return tfm;
 734
 735 out_put_alg:
 736         crypto_mod_put(alg);
 737         return tfm;
 738 }
 739 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 740
 741 int crypto_register_notifier(struct notifier_block *nb)
 742 {
 743         return blocking_notifier_chain_register(&crypto_chain, nb);
 744 }
 745 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 746
 747 int crypto_unregister_notifier(struct notifier_block *nb)
 748 {
 749         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 750 }
 751 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 752
 753 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 754 {
 755         struct rtattr *rta = tb[0];
 756         struct crypto_attr_type *algt;
 757
 758         if (!rta)
 759                 return ERR_PTR(-ENOENT);
 760         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 761                 return ERR_PTR(-EINVAL);
 762         if (rta->rta_type != CRYPTOA_TYPE)
 763                 return ERR_PTR(-EINVAL);
 764
 765         algt = RTA_DATA(rta);
 766
 767         return algt;
 768 }
 769 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 770
 771 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 772 {
 773         struct crypto_attr_type *algt;
 774
 775         algt = crypto_get_attr_type(tb);
 776         if (IS_ERR(algt))
 777                 return PTR_ERR(algt);
 778
 779         if ((algt->type ^ type) & algt->mask)
 780                 return -EINVAL;
 781
 782         return 0;
 783 }
 784 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 785
 786 const char *crypto_attr_alg_name(struct rtattr *rta)
 787 {
 788         struct crypto_attr_alg *alga;
 789
 790         if (!rta)
 791                 return ERR_PTR(-ENOENT);
 792         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 793                 return ERR_PTR(-EINVAL);
 794         if (rta->rta_type != CRYPTOA_ALG)
 795                 return ERR_PTR(-EINVAL);
 796
 797         alga = RTA_DATA(rta);
 798         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 799
 800         return alga->name;
 801 }
 802 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 803
 804 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 805                                     const struct crypto_type *frontend,
 806                                     u32 type, u32 mask)
 807 {
 808         const char *name;
 809
 810         name = crypto_attr_alg_name(rta);
 811         if (IS_ERR(name))
 812                 return ERR_CAST(name);
 813
 814         return crypto_find_alg(name, frontend, type, mask);
 815 }
 816 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 817
 818 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 819 {
 820         struct crypto_attr_u32 *nu32;
 821
 822         if (!rta)
 823                 return -ENOENT;
 824         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 825                 return -EINVAL;
 826         if (rta->rta_type != CRYPTOA_U32)
 827                 return -EINVAL;
 828
 829         nu32 = RTA_DATA(rta);
 830         *num = nu32->num;
 831
 832         return 0;
 833 }
 834 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 835
 836 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 837                         struct crypto_alg *alg)
 838 {
 839         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 840                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 841                 return -ENAMETOOLONG;
 842
 843         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 844                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 845                 return -ENAMETOOLONG;
 846
 847         return 0;
 848 }
 849 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 850
 851 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
 852                             unsigned int head)
 853 {
 854         struct crypto_instance *inst;
 855         char *p;
 856         int err;
 857
 858         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 859                     GFP_KERNEL);
 860         if (!p)
 861                 return ERR_PTR(-ENOMEM);
 862
 863         inst = (void *)(p + head);
 864
 865         err = crypto_inst_setname(inst, name, alg);
 866         if (err)
 867                 goto err_free_inst;
 868
 869         return p;
 870
 871 err_free_inst:
 872         kfree(p);
 873         return ERR_PTR(err);
 874 }
 875 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 876
 877 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 878 {
 879         INIT_LIST_HEAD(&queue->list);
 880         queue->backlog = &queue->list;
 881         queue->qlen = 0;
 882         queue->max_qlen = max_qlen;
 883 }
 884 EXPORT_SYMBOL_GPL(crypto_init_queue);
 885
 886 int crypto_enqueue_request(struct crypto_queue *queue,
 887                            struct crypto_async_request *request)
 888 {
 889         int err = -EINPROGRESS;
 890
 891         if (unlikely(queue->qlen >= queue->max_qlen)) {
 892                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 893                         err = -ENOSPC;
 894                         goto out;
 895                 }
 896                 err = -EBUSY;
 897                 if (queue->backlog == &queue->list)
 898                         queue->backlog = &request->list;
 899         }
 900
 901         queue->qlen++;
 902         list_add_tail(&request->list, &queue->list);
 903
 904 out:
 905         return err;
 906 }
 907 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 908
 909 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 910 {
 911         struct list_head *request;
 912
 913         if (unlikely(!queue->qlen))
 914                 return NULL;
 915
 916         queue->qlen--;
 917
 918         if (queue->backlog != &queue->list)
 919                 queue->backlog = queue->backlog->next;
 920
 921         request = queue->list.next;
 922         list_del(request);
 923
 924         return list_entry(request, struct crypto_async_request, list);
 925 }
 926 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 927
 928 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 929 {
 930         struct crypto_async_request *req;
 931
 932         list_for_each_entry(req, &queue->list, list) {
 933                 if (req->tfm == tfm)
 934                         return 1;
 935         }
 936
 937         return 0;
 938 }
 939 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 940
 941 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 942 {
 943         u8 *b = (a + size);
 944         u8 c;
 945
 946         for (; size; size--) {
 947                 c = *--b + 1;
 948                 *b = c;
 949                 if (c)
 950                         break;
 951         }
 952 }
 953
 954 void crypto_inc(u8 *a, unsigned int size)
 955 {
 956         __be32 *b = (__be32 *)(a + size);
 957         u32 c;
 958
 959         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 960             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 961                 for (; size >= 4; size -= 4) {
 962                         c = be32_to_cpu(*--b) + 1;
 963                         *b = cpu_to_be32(c);
 964                         if (likely(c))
 965                                 return;
 966                 }
 967
 968         crypto_inc_byte(a, size);
 969 }
 970 EXPORT_SYMBOL_GPL(crypto_inc);
 971
 972 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
 973 {
 974         int relalign = 0;
 975
 976         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
 977                 int size = sizeof(unsigned long);
 978                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
 979                          ((unsigned long)dst ^ (unsigned long)src2)) &
 980                         (size - 1);
 981
 982                 relalign = d ? 1 << __ffs(d) : size;
 983
 984                 /*
 985                  * If we care about alignment, process as many bytes as
 986                  * needed to advance dst and src to values whose alignments
 987                  * equal their relative alignment. This will allow us to
 988                  * process the remainder of the input using optimal strides.
 989                  */
 990                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
 991                         *dst++ = *src1++ ^ *src2++;
 992                         len--;
 993                 }
 994         }
 995
 996         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
 997                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
 998                 dst += 8;
 999                 src1 += 8;
1000                 src2 += 8;
1001                 len -= 8;
1002         }
1003
1004         while (len >= 4 && !(relalign & 3)) {
1005                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1006                 dst += 4;
1007                 src1 += 4;
1008                 src2 += 4;
1009                 len -= 4;
1010         }
1011
1012         while (len >= 2 && !(relalign & 1)) {
1013                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1014                 dst += 2;
1015                 src1 += 2;
1016                 src2 += 2;
1017                 len -= 2;
1018         }
1019
1020         while (len--)
1021                 *dst++ = *src1++ ^ *src2++;
1022 }
1023 EXPORT_SYMBOL_GPL(__crypto_xor);
1024
1025 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1026 {
1027         return alg->cra_ctxsize +
1028                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1029 }
1030 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1031
1032 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1033                         u32 type, u32 mask)
1034 {
1035         int ret = 0;
1036         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1037
1038         if (!IS_ERR(alg)) {
1039                 crypto_mod_put(alg);
1040                 ret = 1;
1041         }
1042
1043         return ret;
1044 }
1045 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1046
1047 #ifdef CONFIG_CRYPTO_STATS
1048 void crypto_stats_init(struct crypto_alg *alg)
1049 {
1050         memset(&alg->stats, 0, sizeof(alg->stats));
1051 }
1052 EXPORT_SYMBOL_GPL(crypto_stats_init);
1053
1054 void crypto_stats_get(struct crypto_alg *alg)
1055 {
1056         crypto_alg_get(alg);
1057 }
1058 EXPORT_SYMBOL_GPL(crypto_stats_get);
1059
1060 void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1061                                      struct crypto_alg *alg)
1062 {
1063         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1064                 atomic64_inc(&alg->stats.cipher.err_cnt);
1065         } else {
1066                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1067                 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1068         }
1069         crypto_alg_put(alg);
1070 }
1071 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1072
1073 void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1074                                      struct crypto_alg *alg)
1075 {
1076         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1077                 atomic64_inc(&alg->stats.cipher.err_cnt);
1078         } else {
1079                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1080                 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1081         }
1082         crypto_alg_put(alg);
1083 }
1084 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1085
1086 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1087                                int ret)
1088 {
1089         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1090                 atomic64_inc(&alg->stats.aead.err_cnt);
1091         } else {
1092                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1093                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1094         }
1095         crypto_alg_put(alg);
1096 }
1097 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1098
1099 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1100                                int ret)
1101 {
1102         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1103                 atomic64_inc(&alg->stats.aead.err_cnt);
1104         } else {
1105                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1106                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1107         }
1108         crypto_alg_put(alg);
1109 }
1110 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1111
1112 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1113                                    struct crypto_alg *alg)
1114 {
1115         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1116                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1117         } else {
1118                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1119                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1120         }
1121         crypto_alg_put(alg);
1122 }
1123 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1124
1125 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1126                                    struct crypto_alg *alg)
1127 {
1128         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1129                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1130         } else {
1131                 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1132                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1133         }
1134         crypto_alg_put(alg);
1135 }
1136 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1137
1138 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1139 {
1140         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1141                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1142         else
1143                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1144         crypto_alg_put(alg);
1145 }
1146 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1147
1148 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1149 {
1150         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1151                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1152         else
1153                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1154         crypto_alg_put(alg);
1155 }
1156 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1157
1158 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1159 {
1160         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1161                 atomic64_inc(&alg->stats.compress.err_cnt);
1162         } else {
1163                 atomic64_inc(&alg->stats.compress.compress_cnt);
1164                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1165         }
1166         crypto_alg_put(alg);
1167 }
1168 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1169
1170 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1171 {
1172         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1173                 atomic64_inc(&alg->stats.compress.err_cnt);
1174         } else {
1175                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1176                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1177         }
1178         crypto_alg_put(alg);
1179 }
1180 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1181
1182 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1183                                struct crypto_alg *alg)
1184 {
1185         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1186                 atomic64_inc(&alg->stats.hash.err_cnt);
1187         else
1188                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1189         crypto_alg_put(alg);
1190 }
1191 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1192
1193 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1194                               struct crypto_alg *alg)
1195 {
1196         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1197                 atomic64_inc(&alg->stats.hash.err_cnt);
1198         } else {
1199                 atomic64_inc(&alg->stats.hash.hash_cnt);
1200                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1201         }
1202         crypto_alg_put(alg);
1203 }
1204 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1205
1206 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1207 {
1208         if (ret)
1209                 atomic64_inc(&alg->stats.kpp.err_cnt);
1210         else
1211                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1212         crypto_alg_put(alg);
1213 }
1214 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1215
1216 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1217 {
1218         if (ret)
1219                 atomic64_inc(&alg->stats.kpp.err_cnt);
1220         else
1221                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1222         crypto_alg_put(alg);
1223 }
1224 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1225
1226 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1227 {
1228         if (ret)
1229                 atomic64_inc(&alg->stats.kpp.err_cnt);
1230         else
1231                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1232         crypto_alg_put(alg);
1233 }
1234 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1235
1236 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1237 {
1238         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1239                 atomic64_inc(&alg->stats.rng.err_cnt);
1240         else
1241                 atomic64_inc(&alg->stats.rng.seed_cnt);
1242         crypto_alg_put(alg);
1243 }
1244 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1245
1246 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1247                                int ret)
1248 {
1249         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1250                 atomic64_inc(&alg->stats.rng.err_cnt);
1251         } else {
1252                 atomic64_inc(&alg->stats.rng.generate_cnt);
1253                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1254         }
1255         crypto_alg_put(alg);
1256 }
1257 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1258
1259 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1260                                    struct crypto_alg *alg)
1261 {
1262         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1263                 atomic64_inc(&alg->stats.cipher.err_cnt);
1264         } else {
1265                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1266                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1267         }
1268         crypto_alg_put(alg);
1269 }
1270 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1271
1272 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1273                                    struct crypto_alg *alg)
1274 {
1275         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1276                 atomic64_inc(&alg->stats.cipher.err_cnt);
1277         } else {
1278                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1279                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1280         }
1281         crypto_alg_put(alg);
1282 }
1283 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1284 #endif
1285
1286 static int __init crypto_algapi_init(void)
1287 {
1288         crypto_init_proc();
1289         return 0;
1290 }
1291
1292 static void __exit crypto_algapi_exit(void)
1293 {
1294         crypto_exit_proc();
1295 }
1296
1297 module_init(crypto_algapi_init);
1298 module_exit(crypto_algapi_exit);
1299
1300 MODULE_LICENSE("GPL");
1301 MODULE_DESCRIPTION("Cryptographic algorithms API");