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