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 <linux/err.h>
  14 #include <linux/errno.h>
  15 #include <linux/fips.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/list.h>
  19 #include <linux/module.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23
  24 #include "internal.h"
  25
  26 static LIST_HEAD(crypto_template_list);
  27
  28 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  29 {
  30         static const char suffix[] = "-generic";
  31         char *driver_name = alg->cra_driver_name;
  32         int len;
  33
  34         if (*driver_name)
  35                 return 0;
  36
  37         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  38         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  39                 return -ENAMETOOLONG;
  40
  41         memcpy(driver_name + len, suffix, sizeof(suffix));
  42         return 0;
  43 }
  44
  45 static inline void crypto_check_module_sig(struct module *mod)
  46 {
  47         if (fips_enabled && mod && !module_sig_ok(mod))
  48                 panic("Module %s signature verification failed in FIPS mode\n",
  49                       module_name(mod));
  50 }
  51
  52 static int crypto_check_alg(struct crypto_alg *alg)
  53 {
  54         crypto_check_module_sig(alg->cra_module);
  55
  56         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  57                 return -EINVAL;
  58
  59         if (alg->cra_blocksize > PAGE_SIZE / 8)
  60                 return -EINVAL;
  61
  62         if (alg->cra_priority < 0)
  63                 return -EINVAL;
  64
  65         refcount_set(&alg->cra_refcnt, 1);
  66
  67         return crypto_set_driver_name(alg);
  68 }
  69
  70 static void crypto_free_instance(struct crypto_instance *inst)
  71 {
  72         if (!inst->alg.cra_type->free) {
  73                 inst->tmpl->free(inst);
  74                 return;
  75         }
  76
  77         inst->alg.cra_type->free(inst);
  78 }
  79
  80 static void crypto_destroy_instance(struct crypto_alg *alg)
  81 {
  82         struct crypto_instance *inst = (void *)alg;
  83         struct crypto_template *tmpl = inst->tmpl;
  84
  85         crypto_free_instance(inst);
  86         crypto_tmpl_put(tmpl);
  87 }
  88
  89 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  90                                             struct list_head *stack,
  91                                             struct list_head *top,
  92                                             struct list_head *secondary_spawns)
  93 {
  94         struct crypto_spawn *spawn, *n;
  95
  96         spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
  97         if (!spawn)
  98                 return NULL;
  99
 100         n = list_next_entry(spawn, list);
 101
 102         if (spawn->alg && &n->list != stack && !n->alg)
 103                 n->alg = (n->list.next == stack) ? alg :
 104                          &list_next_entry(n, list)->inst->alg;
 105
 106         list_move(&spawn->list, secondary_spawns);
 107
 108         return &n->list == stack ? top : &n->inst->alg.cra_users;
 109 }
 110
 111 static void crypto_remove_instance(struct crypto_instance *inst,
 112                                    struct list_head *list)
 113 {
 114         struct crypto_template *tmpl = inst->tmpl;
 115
 116         if (crypto_is_dead(&inst->alg))
 117                 return;
 118
 119         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 120         if (hlist_unhashed(&inst->list))
 121                 return;
 122
 123         if (!tmpl || !crypto_tmpl_get(tmpl))
 124                 return;
 125
 126         list_move(&inst->alg.cra_list, list);
 127         hlist_del(&inst->list);
 128         inst->alg.cra_destroy = crypto_destroy_instance;
 129
 130         BUG_ON(!list_empty(&inst->alg.cra_users));
 131 }
 132
 133 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 134                           struct crypto_alg *nalg)
 135 {
 136         u32 new_type = (nalg ?: alg)->cra_flags;
 137         struct crypto_spawn *spawn, *n;
 138         LIST_HEAD(secondary_spawns);
 139         struct list_head *spawns;
 140         LIST_HEAD(stack);
 141         LIST_HEAD(top);
 142
 143         spawns = &alg->cra_users;
 144         list_for_each_entry_safe(spawn, n, spawns, list) {
 145                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 146                         continue;
 147
 148                 list_move(&spawn->list, &top);
 149         }
 150
 151         spawns = &top;
 152         do {
 153                 while (!list_empty(spawns)) {
 154                         struct crypto_instance *inst;
 155
 156                         spawn = list_first_entry(spawns, struct crypto_spawn,
 157                                                  list);
 158                         inst = spawn->inst;
 159
 160                         BUG_ON(&inst->alg == alg);
 161
 162                         list_move(&spawn->list, &stack);
 163
 164                         if (&inst->alg == nalg)
 165                                 break;
 166
 167                         spawn->alg = NULL;
 168                         spawns = &inst->alg.cra_users;
 169
 170                         /*
 171                          * We may encounter an unregistered instance here, since
 172                          * an instance's spawns are set up prior to the instance
 173                          * being registered.  An unregistered instance will have
 174                          * NULL ->cra_users.next, since ->cra_users isn't
 175                          * properly initialized until registration.  But an
 176                          * unregistered instance cannot have any users, so treat
 177                          * it the same as ->cra_users being empty.
 178                          */
 179                         if (spawns->next == NULL)
 180                                 break;
 181                 }
 182         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 183                                               &secondary_spawns)));
 184
 185         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 186                 if (spawn->alg)
 187                         list_move(&spawn->list, &spawn->alg->cra_users);
 188                 else
 189                         crypto_remove_instance(spawn->inst, list);
 190         }
 191 }
 192 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 193
 194 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 195 {
 196         struct crypto_alg *q;
 197         struct crypto_larval *larval;
 198         int ret = -EAGAIN;
 199
 200         if (crypto_is_dead(alg))
 201                 goto err;
 202
 203         INIT_LIST_HEAD(&alg->cra_users);
 204
 205         /* No cheating! */
 206         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 207
 208         ret = -EEXIST;
 209
 210         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 211                 if (q == alg)
 212                         goto err;
 213
 214                 if (crypto_is_moribund(q))
 215                         continue;
 216
 217                 if (crypto_is_larval(q)) {
 218                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 219                                 goto err;
 220                         continue;
 221                 }
 222
 223                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 224                     !strcmp(q->cra_name, alg->cra_driver_name))
 225                         goto err;
 226         }
 227
 228         larval = crypto_larval_alloc(alg->cra_name,
 229                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 230         if (IS_ERR(larval))
 231                 goto out;
 232
 233         ret = -ENOENT;
 234         larval->adult = crypto_mod_get(alg);
 235         if (!larval->adult)
 236                 goto free_larval;
 237
 238         refcount_set(&larval->alg.cra_refcnt, 1);
 239         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 240                CRYPTO_MAX_ALG_NAME);
 241         larval->alg.cra_priority = alg->cra_priority;
 242
 243         list_add(&alg->cra_list, &crypto_alg_list);
 244         list_add(&larval->alg.cra_list, &crypto_alg_list);
 245
 246 out:
 247         return larval;
 248
 249 free_larval:
 250         kfree(larval);
 251 err:
 252         larval = ERR_PTR(ret);
 253         goto out;
 254 }
 255
 256 void crypto_alg_tested(const char *name, int err)
 257 {
 258         struct crypto_larval *test;
 259         struct crypto_alg *alg;
 260         struct crypto_alg *q;
 261         LIST_HEAD(list);
 262
 263         down_write(&crypto_alg_sem);
 264         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 265                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 266                         continue;
 267
 268                 test = (struct crypto_larval *)q;
 269
 270                 if (!strcmp(q->cra_driver_name, name))
 271                         goto found;
 272         }
 273
 274         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 275         goto unlock;
 276
 277 found:
 278         q->cra_flags |= CRYPTO_ALG_DEAD;
 279         alg = test->adult;
 280         if (err || list_empty(&alg->cra_list))
 281                 goto complete;
 282
 283         alg->cra_flags |= CRYPTO_ALG_TESTED;
 284
 285         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 286                 if (q == alg)
 287                         continue;
 288
 289                 if (crypto_is_moribund(q))
 290                         continue;
 291
 292                 if (crypto_is_larval(q)) {
 293                         struct crypto_larval *larval = (void *)q;
 294
 295                         /*
 296                          * Check to see if either our generic name or
 297                          * specific name can satisfy the name requested
 298                          * by the larval entry q.
 299                          */
 300                         if (strcmp(alg->cra_name, q->cra_name) &&
 301                             strcmp(alg->cra_driver_name, q->cra_name))
 302                                 continue;
 303
 304                         if (larval->adult)
 305                                 continue;
 306                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 307                                 continue;
 308                         if (!crypto_mod_get(alg))
 309                                 continue;
 310
 311                         larval->adult = alg;
 312                         continue;
 313                 }
 314
 315                 if (strcmp(alg->cra_name, q->cra_name))
 316                         continue;
 317
 318                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 319                     q->cra_priority > alg->cra_priority)
 320                         continue;
 321
 322                 crypto_remove_spawns(q, &list, alg);
 323         }
 324
 325 complete:
 326         complete_all(&test->completion);
 327
 328 unlock:
 329         up_write(&crypto_alg_sem);
 330
 331         crypto_remove_final(&list);
 332 }
 333 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 334
 335 void crypto_remove_final(struct list_head *list)
 336 {
 337         struct crypto_alg *alg;
 338         struct crypto_alg *n;
 339
 340         list_for_each_entry_safe(alg, n, list, cra_list) {
 341                 list_del_init(&alg->cra_list);
 342                 crypto_alg_put(alg);
 343         }
 344 }
 345 EXPORT_SYMBOL_GPL(crypto_remove_final);
 346
 347 static void crypto_wait_for_test(struct crypto_larval *larval)
 348 {
 349         int err;
 350
 351         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 352         if (err != NOTIFY_STOP) {
 353                 if (WARN_ON(err != NOTIFY_DONE))
 354                         goto out;
 355                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 356         }
 357
 358         err = wait_for_completion_killable(&larval->completion);
 359         WARN_ON(err);
 360
 361 out:
 362         crypto_larval_kill(&larval->alg);
 363 }
 364
 365 int crypto_register_alg(struct crypto_alg *alg)
 366 {
 367         struct crypto_larval *larval;
 368         int err;
 369
 370         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 371         err = crypto_check_alg(alg);
 372         if (err)
 373                 return err;
 374
 375         down_write(&crypto_alg_sem);
 376         larval = __crypto_register_alg(alg);
 377         up_write(&crypto_alg_sem);
 378
 379         if (IS_ERR(larval))
 380                 return PTR_ERR(larval);
 381
 382         crypto_wait_for_test(larval);
 383         return 0;
 384 }
 385 EXPORT_SYMBOL_GPL(crypto_register_alg);
 386
 387 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 388 {
 389         if (unlikely(list_empty(&alg->cra_list)))
 390                 return -ENOENT;
 391
 392         alg->cra_flags |= CRYPTO_ALG_DEAD;
 393
 394         list_del_init(&alg->cra_list);
 395         crypto_remove_spawns(alg, list, NULL);
 396
 397         return 0;
 398 }
 399
 400 int crypto_unregister_alg(struct crypto_alg *alg)
 401 {
 402         int ret;
 403         LIST_HEAD(list);
 404
 405         down_write(&crypto_alg_sem);
 406         ret = crypto_remove_alg(alg, &list);
 407         up_write(&crypto_alg_sem);
 408
 409         if (ret)
 410                 return ret;
 411
 412         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 413         if (alg->cra_destroy)
 414                 alg->cra_destroy(alg);
 415
 416         crypto_remove_final(&list);
 417         return 0;
 418 }
 419 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 420
 421 int crypto_register_algs(struct crypto_alg *algs, int count)
 422 {
 423         int i, ret;
 424
 425         for (i = 0; i < count; i++) {
 426                 ret = crypto_register_alg(&algs[i]);
 427                 if (ret)
 428                         goto err;
 429         }
 430
 431         return 0;
 432
 433 err:
 434         for (--i; i >= 0; --i)
 435                 crypto_unregister_alg(&algs[i]);
 436
 437         return ret;
 438 }
 439 EXPORT_SYMBOL_GPL(crypto_register_algs);
 440
 441 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 442 {
 443         int i, ret;
 444
 445         for (i = 0; i < count; i++) {
 446                 ret = crypto_unregister_alg(&algs[i]);
 447                 if (ret)
 448                         pr_err("Failed to unregister %s %s: %d\n",
 449                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 450         }
 451
 452         return 0;
 453 }
 454 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 455
 456 int crypto_register_template(struct crypto_template *tmpl)
 457 {
 458         struct crypto_template *q;
 459         int err = -EEXIST;
 460
 461         down_write(&crypto_alg_sem);
 462
 463         crypto_check_module_sig(tmpl->module);
 464
 465         list_for_each_entry(q, &crypto_template_list, list) {
 466                 if (q == tmpl)
 467                         goto out;
 468         }
 469
 470         list_add(&tmpl->list, &crypto_template_list);
 471         err = 0;
 472 out:
 473         up_write(&crypto_alg_sem);
 474         return err;
 475 }
 476 EXPORT_SYMBOL_GPL(crypto_register_template);
 477
 478 void crypto_unregister_template(struct crypto_template *tmpl)
 479 {
 480         struct crypto_instance *inst;
 481         struct hlist_node *n;
 482         struct hlist_head *list;
 483         LIST_HEAD(users);
 484
 485         down_write(&crypto_alg_sem);
 486
 487         BUG_ON(list_empty(&tmpl->list));
 488         list_del_init(&tmpl->list);
 489
 490         list = &tmpl->instances;
 491         hlist_for_each_entry(inst, list, list) {
 492                 int err = crypto_remove_alg(&inst->alg, &users);
 493
 494                 BUG_ON(err);
 495         }
 496
 497         up_write(&crypto_alg_sem);
 498
 499         hlist_for_each_entry_safe(inst, n, list, list) {
 500                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 501                 crypto_free_instance(inst);
 502         }
 503         crypto_remove_final(&users);
 504 }
 505 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 506
 507 static struct crypto_template *__crypto_lookup_template(const char *name)
 508 {
 509         struct crypto_template *q, *tmpl = NULL;
 510
 511         down_read(&crypto_alg_sem);
 512         list_for_each_entry(q, &crypto_template_list, list) {
 513                 if (strcmp(q->name, name))
 514                         continue;
 515                 if (unlikely(!crypto_tmpl_get(q)))
 516                         continue;
 517
 518                 tmpl = q;
 519                 break;
 520         }
 521         up_read(&crypto_alg_sem);
 522
 523         return tmpl;
 524 }
 525
 526 struct crypto_template *crypto_lookup_template(const char *name)
 527 {
 528         return try_then_request_module(__crypto_lookup_template(name),
 529                                        "crypto-%s", name);
 530 }
 531 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 532
 533 int crypto_register_instance(struct crypto_template *tmpl,
 534                              struct crypto_instance *inst)
 535 {
 536         struct crypto_larval *larval;
 537         int err;
 538
 539         err = crypto_check_alg(&inst->alg);
 540         if (err)
 541                 return err;
 542
 543         inst->alg.cra_module = tmpl->module;
 544         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 545
 546         if (unlikely(!crypto_mod_get(&inst->alg)))
 547                 return -EAGAIN;
 548
 549         down_write(&crypto_alg_sem);
 550
 551         larval = __crypto_register_alg(&inst->alg);
 552         if (IS_ERR(larval))
 553                 goto unlock;
 554
 555         hlist_add_head(&inst->list, &tmpl->instances);
 556         inst->tmpl = tmpl;
 557
 558 unlock:
 559         up_write(&crypto_alg_sem);
 560
 561         err = PTR_ERR(larval);
 562         if (IS_ERR(larval))
 563                 goto err;
 564
 565         crypto_wait_for_test(larval);
 566
 567         /* Remove instance if test failed */
 568         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 569                 crypto_unregister_instance(inst);
 570         err = 0;
 571
 572 err:
 573         crypto_mod_put(&inst->alg);
 574         return err;
 575 }
 576 EXPORT_SYMBOL_GPL(crypto_register_instance);
 577
 578 int crypto_unregister_instance(struct crypto_instance *inst)
 579 {
 580         LIST_HEAD(list);
 581
 582         down_write(&crypto_alg_sem);
 583
 584         crypto_remove_spawns(&inst->alg, &list, NULL);
 585         crypto_remove_instance(inst, &list);
 586
 587         up_write(&crypto_alg_sem);
 588
 589         crypto_remove_final(&list);
 590
 591         return 0;
 592 }
 593 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 594
 595 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 596                       struct crypto_instance *inst, u32 mask)
 597 {
 598         int err = -EAGAIN;
 599
 600         spawn->inst = inst;
 601         spawn->mask = mask;
 602
 603         down_write(&crypto_alg_sem);
 604         if (!crypto_is_moribund(alg)) {
 605                 list_add(&spawn->list, &alg->cra_users);
 606                 spawn->alg = alg;
 607                 err = 0;
 608         }
 609         up_write(&crypto_alg_sem);
 610
 611         return err;
 612 }
 613 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 614
 615 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 616                        struct crypto_instance *inst,
 617                        const struct crypto_type *frontend)
 618 {
 619         int err = -EINVAL;
 620
 621         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 622                 goto out;
 623
 624         spawn->frontend = frontend;
 625         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 626
 627 out:
 628         return err;
 629 }
 630 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 631
 632 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 633                       u32 type, u32 mask)
 634 {
 635         struct crypto_alg *alg;
 636         int err;
 637
 638         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 639         if (IS_ERR(alg))
 640                 return PTR_ERR(alg);
 641
 642         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 643         crypto_mod_put(alg);
 644         return err;
 645 }
 646 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 647
 648 void crypto_drop_spawn(struct crypto_spawn *spawn)
 649 {
 650         if (!spawn->alg)
 651                 return;
 652
 653         down_write(&crypto_alg_sem);
 654         list_del(&spawn->list);
 655         up_write(&crypto_alg_sem);
 656 }
 657 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 658
 659 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 660 {
 661         struct crypto_alg *alg;
 662         struct crypto_alg *alg2;
 663
 664         down_read(&crypto_alg_sem);
 665         alg = spawn->alg;
 666         alg2 = alg;
 667         if (alg2)
 668                 alg2 = crypto_mod_get(alg2);
 669         up_read(&crypto_alg_sem);
 670
 671         if (!alg2) {
 672                 if (alg)
 673                         crypto_shoot_alg(alg);
 674                 return ERR_PTR(-EAGAIN);
 675         }
 676
 677         return alg;
 678 }
 679
 680 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 681                                     u32 mask)
 682 {
 683         struct crypto_alg *alg;
 684         struct crypto_tfm *tfm;
 685
 686         alg = crypto_spawn_alg(spawn);
 687         if (IS_ERR(alg))
 688                 return ERR_CAST(alg);
 689
 690         tfm = ERR_PTR(-EINVAL);
 691         if (unlikely((alg->cra_flags ^ type) & mask))
 692                 goto out_put_alg;
 693
 694         tfm = __crypto_alloc_tfm(alg, type, mask);
 695         if (IS_ERR(tfm))
 696                 goto out_put_alg;
 697
 698         return tfm;
 699
 700 out_put_alg:
 701         crypto_mod_put(alg);
 702         return tfm;
 703 }
 704 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 705
 706 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 707 {
 708         struct crypto_alg *alg;
 709         struct crypto_tfm *tfm;
 710
 711         alg = crypto_spawn_alg(spawn);
 712         if (IS_ERR(alg))
 713                 return ERR_CAST(alg);
 714
 715         tfm = crypto_create_tfm(alg, spawn->frontend);
 716         if (IS_ERR(tfm))
 717                 goto out_put_alg;
 718
 719         return tfm;
 720
 721 out_put_alg:
 722         crypto_mod_put(alg);
 723         return tfm;
 724 }
 725 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 726
 727 int crypto_register_notifier(struct notifier_block *nb)
 728 {
 729         return blocking_notifier_chain_register(&crypto_chain, nb);
 730 }
 731 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 732
 733 int crypto_unregister_notifier(struct notifier_block *nb)
 734 {
 735         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 736 }
 737 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 738
 739 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 740 {
 741         struct rtattr *rta = tb[0];
 742         struct crypto_attr_type *algt;
 743
 744         if (!rta)
 745                 return ERR_PTR(-ENOENT);
 746         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 747                 return ERR_PTR(-EINVAL);
 748         if (rta->rta_type != CRYPTOA_TYPE)
 749                 return ERR_PTR(-EINVAL);
 750
 751         algt = RTA_DATA(rta);
 752
 753         return algt;
 754 }
 755 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 756
 757 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 758 {
 759         struct crypto_attr_type *algt;
 760
 761         algt = crypto_get_attr_type(tb);
 762         if (IS_ERR(algt))
 763                 return PTR_ERR(algt);
 764
 765         if ((algt->type ^ type) & algt->mask)
 766                 return -EINVAL;
 767
 768         return 0;
 769 }
 770 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 771
 772 const char *crypto_attr_alg_name(struct rtattr *rta)
 773 {
 774         struct crypto_attr_alg *alga;
 775
 776         if (!rta)
 777                 return ERR_PTR(-ENOENT);
 778         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 779                 return ERR_PTR(-EINVAL);
 780         if (rta->rta_type != CRYPTOA_ALG)
 781                 return ERR_PTR(-EINVAL);
 782
 783         alga = RTA_DATA(rta);
 784         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 785
 786         return alga->name;
 787 }
 788 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 789
 790 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 791                                     const struct crypto_type *frontend,
 792                                     u32 type, u32 mask)
 793 {
 794         const char *name;
 795
 796         name = crypto_attr_alg_name(rta);
 797         if (IS_ERR(name))
 798                 return ERR_CAST(name);
 799
 800         return crypto_find_alg(name, frontend, type, mask);
 801 }
 802 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 803
 804 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 805 {
 806         struct crypto_attr_u32 *nu32;
 807
 808         if (!rta)
 809                 return -ENOENT;
 810         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 811                 return -EINVAL;
 812         if (rta->rta_type != CRYPTOA_U32)
 813                 return -EINVAL;
 814
 815         nu32 = RTA_DATA(rta);
 816         *num = nu32->num;
 817
 818         return 0;
 819 }
 820 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 821
 822 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 823                         struct crypto_alg *alg)
 824 {
 825         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 826                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 827                 return -ENAMETOOLONG;
 828
 829         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 830                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 831                 return -ENAMETOOLONG;
 832
 833         return 0;
 834 }
 835 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 836
 837 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 838                              unsigned int head)
 839 {
 840         struct crypto_instance *inst;
 841         char *p;
 842         int err;
 843
 844         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 845                     GFP_KERNEL);
 846         if (!p)
 847                 return ERR_PTR(-ENOMEM);
 848
 849         inst = (void *)(p + head);
 850
 851         err = crypto_inst_setname(inst, name, alg);
 852         if (err)
 853                 goto err_free_inst;
 854
 855         return p;
 856
 857 err_free_inst:
 858         kfree(p);
 859         return ERR_PTR(err);
 860 }
 861 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 862
 863 struct crypto_instance *crypto_alloc_instance(const char *name,
 864                                               struct crypto_alg *alg)
 865 {
 866         struct crypto_instance *inst;
 867         struct crypto_spawn *spawn;
 868         int err;
 869
 870         inst = crypto_alloc_instance2(name, alg, 0);
 871         if (IS_ERR(inst))
 872                 goto out;
 873
 874         spawn = crypto_instance_ctx(inst);
 875         err = crypto_init_spawn(spawn, alg, inst,
 876                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 877
 878         if (err)
 879                 goto err_free_inst;
 880
 881         return inst;
 882
 883 err_free_inst:
 884         kfree(inst);
 885         inst = ERR_PTR(err);
 886
 887 out:
 888         return inst;
 889 }
 890 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 891
 892 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 893 {
 894         INIT_LIST_HEAD(&queue->list);
 895         queue->backlog = &queue->list;
 896         queue->qlen = 0;
 897         queue->max_qlen = max_qlen;
 898 }
 899 EXPORT_SYMBOL_GPL(crypto_init_queue);
 900
 901 int crypto_enqueue_request(struct crypto_queue *queue,
 902                            struct crypto_async_request *request)
 903 {
 904         int err = -EINPROGRESS;
 905
 906         if (unlikely(queue->qlen >= queue->max_qlen)) {
 907                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 908                         err = -ENOSPC;
 909                         goto out;
 910                 }
 911                 err = -EBUSY;
 912                 if (queue->backlog == &queue->list)
 913                         queue->backlog = &request->list;
 914         }
 915
 916         queue->qlen++;
 917         list_add_tail(&request->list, &queue->list);
 918
 919 out:
 920         return err;
 921 }
 922 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 923
 924 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 925 {
 926         struct list_head *request;
 927
 928         if (unlikely(!queue->qlen))
 929                 return NULL;
 930
 931         queue->qlen--;
 932
 933         if (queue->backlog != &queue->list)
 934                 queue->backlog = queue->backlog->next;
 935
 936         request = queue->list.next;
 937         list_del(request);
 938
 939         return list_entry(request, struct crypto_async_request, list);
 940 }
 941 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 942
 943 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 944 {
 945         struct crypto_async_request *req;
 946
 947         list_for_each_entry(req, &queue->list, list) {
 948                 if (req->tfm == tfm)
 949                         return 1;
 950         }
 951
 952         return 0;
 953 }
 954 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 955
 956 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 957 {
 958         u8 *b = (a + size);
 959         u8 c;
 960
 961         for (; size; size--) {
 962                 c = *--b + 1;
 963                 *b = c;
 964                 if (c)
 965                         break;
 966         }
 967 }
 968
 969 void crypto_inc(u8 *a, unsigned int size)
 970 {
 971         __be32 *b = (__be32 *)(a + size);
 972         u32 c;
 973
 974         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 975             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 976                 for (; size >= 4; size -= 4) {
 977                         c = be32_to_cpu(*--b) + 1;
 978                         *b = cpu_to_be32(c);
 979                         if (likely(c))
 980                                 return;
 981                 }
 982
 983         crypto_inc_byte(a, size);
 984 }
 985 EXPORT_SYMBOL_GPL(crypto_inc);
 986
 987 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
 988 {
 989         int relalign = 0;
 990
 991         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
 992                 int size = sizeof(unsigned long);
 993                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
 994                          ((unsigned long)dst ^ (unsigned long)src2)) &
 995                         (size - 1);
 996
 997                 relalign = d ? 1 << __ffs(d) : size;
 998
 999                 /*
1000                  * If we care about alignment, process as many bytes as
1001                  * needed to advance dst and src to values whose alignments
1002                  * equal their relative alignment. This will allow us to
1003                  * process the remainder of the input using optimal strides.
1004                  */
1005                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1006                         *dst++ = *src1++ ^ *src2++;
1007                         len--;
1008                 }
1009         }
1010
1011         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1012                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1013                 dst += 8;
1014                 src1 += 8;
1015                 src2 += 8;
1016                 len -= 8;
1017         }
1018
1019         while (len >= 4 && !(relalign & 3)) {
1020                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1021                 dst += 4;
1022                 src1 += 4;
1023                 src2 += 4;
1024                 len -= 4;
1025         }
1026
1027         while (len >= 2 && !(relalign & 1)) {
1028                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1029                 dst += 2;
1030                 src1 += 2;
1031                 src2 += 2;
1032                 len -= 2;
1033         }
1034
1035         while (len--)
1036                 *dst++ = *src1++ ^ *src2++;
1037 }
1038 EXPORT_SYMBOL_GPL(__crypto_xor);
1039
1040 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1041 {
1042         return alg->cra_ctxsize +
1043                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1044 }
1045 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1046
1047 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1048                         u32 type, u32 mask)
1049 {
1050         int ret = 0;
1051         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1052
1053         if (!IS_ERR(alg)) {
1054                 crypto_mod_put(alg);
1055                 ret = 1;
1056         }
1057
1058         return ret;
1059 }
1060 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1061
1062 static int __init crypto_algapi_init(void)
1063 {
1064         crypto_init_proc();
1065         return 0;
1066 }
1067
1068 static void __exit crypto_algapi_exit(void)
1069 {
1070         crypto_exit_proc();
1071 }
1072
1073 module_init(crypto_algapi_init);
1074 module_exit(crypto_algapi_exit);
1075
1076 MODULE_LICENSE("GPL");
1077 MODULE_DESCRIPTION("Cryptographic algorithms API");