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         atomic_set(&alg->encrypt_cnt, 0);
 262         atomic_set(&alg->decrypt_cnt, 0);
 263         atomic64_set(&alg->encrypt_tlen, 0);
 264         atomic64_set(&alg->decrypt_tlen, 0);
 265         atomic_set(&alg->verify_cnt, 0);
 266         atomic_set(&alg->cipher_err_cnt, 0);
 267         atomic_set(&alg->sign_cnt, 0);
 268
 269 out:
 270         return larval;
 271
 272 free_larval:
 273         kfree(larval);
 274 err:
 275         larval = ERR_PTR(ret);
 276         goto out;
 277 }
 278
 279 void crypto_alg_tested(const char *name, int err)
 280 {
 281         struct crypto_larval *test;
 282         struct crypto_alg *alg;
 283         struct crypto_alg *q;
 284         LIST_HEAD(list);
 285
 286         down_write(&crypto_alg_sem);
 287         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 288                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 289                         continue;
 290
 291                 test = (struct crypto_larval *)q;
 292
 293                 if (!strcmp(q->cra_driver_name, name))
 294                         goto found;
 295         }
 296
 297         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 298         goto unlock;
 299
 300 found:
 301         q->cra_flags |= CRYPTO_ALG_DEAD;
 302         alg = test->adult;
 303         if (err || list_empty(&alg->cra_list))
 304                 goto complete;
 305
 306         alg->cra_flags |= CRYPTO_ALG_TESTED;
 307
 308         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 309                 if (q == alg)
 310                         continue;
 311
 312                 if (crypto_is_moribund(q))
 313                         continue;
 314
 315                 if (crypto_is_larval(q)) {
 316                         struct crypto_larval *larval = (void *)q;
 317
 318                         /*
 319                          * Check to see if either our generic name or
 320                          * specific name can satisfy the name requested
 321                          * by the larval entry q.
 322                          */
 323                         if (strcmp(alg->cra_name, q->cra_name) &&
 324                             strcmp(alg->cra_driver_name, q->cra_name))
 325                                 continue;
 326
 327                         if (larval->adult)
 328                                 continue;
 329                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 330                                 continue;
 331                         if (!crypto_mod_get(alg))
 332                                 continue;
 333
 334                         larval->adult = alg;
 335                         continue;
 336                 }
 337
 338                 if (strcmp(alg->cra_name, q->cra_name))
 339                         continue;
 340
 341                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 342                     q->cra_priority > alg->cra_priority)
 343                         continue;
 344
 345                 crypto_remove_spawns(q, &list, alg);
 346         }
 347
 348 complete:
 349         complete_all(&test->completion);
 350
 351 unlock:
 352         up_write(&crypto_alg_sem);
 353
 354         crypto_remove_final(&list);
 355 }
 356 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 357
 358 void crypto_remove_final(struct list_head *list)
 359 {
 360         struct crypto_alg *alg;
 361         struct crypto_alg *n;
 362
 363         list_for_each_entry_safe(alg, n, list, cra_list) {
 364                 list_del_init(&alg->cra_list);
 365                 crypto_alg_put(alg);
 366         }
 367 }
 368 EXPORT_SYMBOL_GPL(crypto_remove_final);
 369
 370 static void crypto_wait_for_test(struct crypto_larval *larval)
 371 {
 372         int err;
 373
 374         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 375         if (err != NOTIFY_STOP) {
 376                 if (WARN_ON(err != NOTIFY_DONE))
 377                         goto out;
 378                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 379         }
 380
 381         err = wait_for_completion_killable(&larval->completion);
 382         WARN_ON(err);
 383         if (!err)
 384                 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
 385
 386 out:
 387         crypto_larval_kill(&larval->alg);
 388 }
 389
 390 int crypto_register_alg(struct crypto_alg *alg)
 391 {
 392         struct crypto_larval *larval;
 393         int err;
 394
 395         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 396         err = crypto_check_alg(alg);
 397         if (err)
 398                 return err;
 399
 400         down_write(&crypto_alg_sem);
 401         larval = __crypto_register_alg(alg);
 402         up_write(&crypto_alg_sem);
 403
 404         if (IS_ERR(larval))
 405                 return PTR_ERR(larval);
 406
 407         crypto_wait_for_test(larval);
 408         return 0;
 409 }
 410 EXPORT_SYMBOL_GPL(crypto_register_alg);
 411
 412 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 413 {
 414         if (unlikely(list_empty(&alg->cra_list)))
 415                 return -ENOENT;
 416
 417         alg->cra_flags |= CRYPTO_ALG_DEAD;
 418
 419         list_del_init(&alg->cra_list);
 420         crypto_remove_spawns(alg, list, NULL);
 421
 422         return 0;
 423 }
 424
 425 int crypto_unregister_alg(struct crypto_alg *alg)
 426 {
 427         int ret;
 428         LIST_HEAD(list);
 429
 430         down_write(&crypto_alg_sem);
 431         ret = crypto_remove_alg(alg, &list);
 432         up_write(&crypto_alg_sem);
 433
 434         if (ret)
 435                 return ret;
 436
 437         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 438         if (alg->cra_destroy)
 439                 alg->cra_destroy(alg);
 440
 441         crypto_remove_final(&list);
 442         return 0;
 443 }
 444 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 445
 446 int crypto_register_algs(struct crypto_alg *algs, int count)
 447 {
 448         int i, ret;
 449
 450         for (i = 0; i < count; i++) {
 451                 ret = crypto_register_alg(&algs[i]);
 452                 if (ret)
 453                         goto err;
 454         }
 455
 456         return 0;
 457
 458 err:
 459         for (--i; i >= 0; --i)
 460                 crypto_unregister_alg(&algs[i]);
 461
 462         return ret;
 463 }
 464 EXPORT_SYMBOL_GPL(crypto_register_algs);
 465
 466 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 467 {
 468         int i, ret;
 469
 470         for (i = 0; i < count; i++) {
 471                 ret = crypto_unregister_alg(&algs[i]);
 472                 if (ret)
 473                         pr_err("Failed to unregister %s %s: %d\n",
 474                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 475         }
 476
 477         return 0;
 478 }
 479 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 480
 481 int crypto_register_template(struct crypto_template *tmpl)
 482 {
 483         struct crypto_template *q;
 484         int err = -EEXIST;
 485
 486         down_write(&crypto_alg_sem);
 487
 488         crypto_check_module_sig(tmpl->module);
 489
 490         list_for_each_entry(q, &crypto_template_list, list) {
 491                 if (q == tmpl)
 492                         goto out;
 493         }
 494
 495         list_add(&tmpl->list, &crypto_template_list);
 496         err = 0;
 497 out:
 498         up_write(&crypto_alg_sem);
 499         return err;
 500 }
 501 EXPORT_SYMBOL_GPL(crypto_register_template);
 502
 503 void crypto_unregister_template(struct crypto_template *tmpl)
 504 {
 505         struct crypto_instance *inst;
 506         struct hlist_node *n;
 507         struct hlist_head *list;
 508         LIST_HEAD(users);
 509
 510         down_write(&crypto_alg_sem);
 511
 512         BUG_ON(list_empty(&tmpl->list));
 513         list_del_init(&tmpl->list);
 514
 515         list = &tmpl->instances;
 516         hlist_for_each_entry(inst, list, list) {
 517                 int err = crypto_remove_alg(&inst->alg, &users);
 518
 519                 BUG_ON(err);
 520         }
 521
 522         up_write(&crypto_alg_sem);
 523
 524         hlist_for_each_entry_safe(inst, n, list, list) {
 525                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 526                 crypto_free_instance(inst);
 527         }
 528         crypto_remove_final(&users);
 529 }
 530 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 531
 532 static struct crypto_template *__crypto_lookup_template(const char *name)
 533 {
 534         struct crypto_template *q, *tmpl = NULL;
 535
 536         down_read(&crypto_alg_sem);
 537         list_for_each_entry(q, &crypto_template_list, list) {
 538                 if (strcmp(q->name, name))
 539                         continue;
 540                 if (unlikely(!crypto_tmpl_get(q)))
 541                         continue;
 542
 543                 tmpl = q;
 544                 break;
 545         }
 546         up_read(&crypto_alg_sem);
 547
 548         return tmpl;
 549 }
 550
 551 struct crypto_template *crypto_lookup_template(const char *name)
 552 {
 553         return try_then_request_module(__crypto_lookup_template(name),
 554                                        "crypto-%s", name);
 555 }
 556 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 557
 558 int crypto_register_instance(struct crypto_template *tmpl,
 559                              struct crypto_instance *inst)
 560 {
 561         struct crypto_larval *larval;
 562         int err;
 563
 564         err = crypto_check_alg(&inst->alg);
 565         if (err)
 566                 return err;
 567
 568         inst->alg.cra_module = tmpl->module;
 569         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 570
 571         down_write(&crypto_alg_sem);
 572
 573         larval = __crypto_register_alg(&inst->alg);
 574         if (IS_ERR(larval))
 575                 goto unlock;
 576
 577         hlist_add_head(&inst->list, &tmpl->instances);
 578         inst->tmpl = tmpl;
 579
 580 unlock:
 581         up_write(&crypto_alg_sem);
 582
 583         err = PTR_ERR(larval);
 584         if (IS_ERR(larval))
 585                 goto err;
 586
 587         crypto_wait_for_test(larval);
 588         err = 0;
 589
 590 err:
 591         return err;
 592 }
 593 EXPORT_SYMBOL_GPL(crypto_register_instance);
 594
 595 int crypto_unregister_instance(struct crypto_instance *inst)
 596 {
 597         LIST_HEAD(list);
 598
 599         down_write(&crypto_alg_sem);
 600
 601         crypto_remove_spawns(&inst->alg, &list, NULL);
 602         crypto_remove_instance(inst, &list);
 603
 604         up_write(&crypto_alg_sem);
 605
 606         crypto_remove_final(&list);
 607
 608         return 0;
 609 }
 610 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 611
 612 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 613                       struct crypto_instance *inst, u32 mask)
 614 {
 615         int err = -EAGAIN;
 616
 617         spawn->inst = inst;
 618         spawn->mask = mask;
 619
 620         down_write(&crypto_alg_sem);
 621         if (!crypto_is_moribund(alg)) {
 622                 list_add(&spawn->list, &alg->cra_users);
 623                 spawn->alg = alg;
 624                 err = 0;
 625         }
 626         up_write(&crypto_alg_sem);
 627
 628         return err;
 629 }
 630 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 631
 632 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 633                        struct crypto_instance *inst,
 634                        const struct crypto_type *frontend)
 635 {
 636         int err = -EINVAL;
 637
 638         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 639                 goto out;
 640
 641         spawn->frontend = frontend;
 642         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 643
 644 out:
 645         return err;
 646 }
 647 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 648
 649 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 650                       u32 type, u32 mask)
 651 {
 652         struct crypto_alg *alg;
 653         int err;
 654
 655         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 656         if (IS_ERR(alg))
 657                 return PTR_ERR(alg);
 658
 659         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 660         crypto_mod_put(alg);
 661         return err;
 662 }
 663 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 664
 665 void crypto_drop_spawn(struct crypto_spawn *spawn)
 666 {
 667         if (!spawn->alg)
 668                 return;
 669
 670         down_write(&crypto_alg_sem);
 671         list_del(&spawn->list);
 672         up_write(&crypto_alg_sem);
 673 }
 674 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 675
 676 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 677 {
 678         struct crypto_alg *alg;
 679         struct crypto_alg *alg2;
 680
 681         down_read(&crypto_alg_sem);
 682         alg = spawn->alg;
 683         alg2 = alg;
 684         if (alg2)
 685                 alg2 = crypto_mod_get(alg2);
 686         up_read(&crypto_alg_sem);
 687
 688         if (!alg2) {
 689                 if (alg)
 690                         crypto_shoot_alg(alg);
 691                 return ERR_PTR(-EAGAIN);
 692         }
 693
 694         return alg;
 695 }
 696
 697 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 698                                     u32 mask)
 699 {
 700         struct crypto_alg *alg;
 701         struct crypto_tfm *tfm;
 702
 703         alg = crypto_spawn_alg(spawn);
 704         if (IS_ERR(alg))
 705                 return ERR_CAST(alg);
 706
 707         tfm = ERR_PTR(-EINVAL);
 708         if (unlikely((alg->cra_flags ^ type) & mask))
 709                 goto out_put_alg;
 710
 711         tfm = __crypto_alloc_tfm(alg, type, mask);
 712         if (IS_ERR(tfm))
 713                 goto out_put_alg;
 714
 715         return tfm;
 716
 717 out_put_alg:
 718         crypto_mod_put(alg);
 719         return tfm;
 720 }
 721 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 722
 723 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 724 {
 725         struct crypto_alg *alg;
 726         struct crypto_tfm *tfm;
 727
 728         alg = crypto_spawn_alg(spawn);
 729         if (IS_ERR(alg))
 730                 return ERR_CAST(alg);
 731
 732         tfm = crypto_create_tfm(alg, spawn->frontend);
 733         if (IS_ERR(tfm))
 734                 goto out_put_alg;
 735
 736         return tfm;
 737
 738 out_put_alg:
 739         crypto_mod_put(alg);
 740         return tfm;
 741 }
 742 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 743
 744 int crypto_register_notifier(struct notifier_block *nb)
 745 {
 746         return blocking_notifier_chain_register(&crypto_chain, nb);
 747 }
 748 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 749
 750 int crypto_unregister_notifier(struct notifier_block *nb)
 751 {
 752         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 753 }
 754 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 755
 756 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 757 {
 758         struct rtattr *rta = tb[0];
 759         struct crypto_attr_type *algt;
 760
 761         if (!rta)
 762                 return ERR_PTR(-ENOENT);
 763         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 764                 return ERR_PTR(-EINVAL);
 765         if (rta->rta_type != CRYPTOA_TYPE)
 766                 return ERR_PTR(-EINVAL);
 767
 768         algt = RTA_DATA(rta);
 769
 770         return algt;
 771 }
 772 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 773
 774 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 775 {
 776         struct crypto_attr_type *algt;
 777
 778         algt = crypto_get_attr_type(tb);
 779         if (IS_ERR(algt))
 780                 return PTR_ERR(algt);
 781
 782         if ((algt->type ^ type) & algt->mask)
 783                 return -EINVAL;
 784
 785         return 0;
 786 }
 787 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 788
 789 const char *crypto_attr_alg_name(struct rtattr *rta)
 790 {
 791         struct crypto_attr_alg *alga;
 792
 793         if (!rta)
 794                 return ERR_PTR(-ENOENT);
 795         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 796                 return ERR_PTR(-EINVAL);
 797         if (rta->rta_type != CRYPTOA_ALG)
 798                 return ERR_PTR(-EINVAL);
 799
 800         alga = RTA_DATA(rta);
 801         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 802
 803         return alga->name;
 804 }
 805 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 806
 807 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 808                                     const struct crypto_type *frontend,
 809                                     u32 type, u32 mask)
 810 {
 811         const char *name;
 812
 813         name = crypto_attr_alg_name(rta);
 814         if (IS_ERR(name))
 815                 return ERR_CAST(name);
 816
 817         return crypto_find_alg(name, frontend, type, mask);
 818 }
 819 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 820
 821 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 822 {
 823         struct crypto_attr_u32 *nu32;
 824
 825         if (!rta)
 826                 return -ENOENT;
 827         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 828                 return -EINVAL;
 829         if (rta->rta_type != CRYPTOA_U32)
 830                 return -EINVAL;
 831
 832         nu32 = RTA_DATA(rta);
 833         *num = nu32->num;
 834
 835         return 0;
 836 }
 837 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 838
 839 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 840                         struct crypto_alg *alg)
 841 {
 842         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 843                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 844                 return -ENAMETOOLONG;
 845
 846         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 847                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 848                 return -ENAMETOOLONG;
 849
 850         return 0;
 851 }
 852 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 853
 854 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 855                              unsigned int head)
 856 {
 857         struct crypto_instance *inst;
 858         char *p;
 859         int err;
 860
 861         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 862                     GFP_KERNEL);
 863         if (!p)
 864                 return ERR_PTR(-ENOMEM);
 865
 866         inst = (void *)(p + head);
 867
 868         err = crypto_inst_setname(inst, name, alg);
 869         if (err)
 870                 goto err_free_inst;
 871
 872         return p;
 873
 874 err_free_inst:
 875         kfree(p);
 876         return ERR_PTR(err);
 877 }
 878 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 879
 880 struct crypto_instance *crypto_alloc_instance(const char *name,
 881                                               struct crypto_alg *alg)
 882 {
 883         struct crypto_instance *inst;
 884         struct crypto_spawn *spawn;
 885         int err;
 886
 887         inst = crypto_alloc_instance2(name, alg, 0);
 888         if (IS_ERR(inst))
 889                 goto out;
 890
 891         spawn = crypto_instance_ctx(inst);
 892         err = crypto_init_spawn(spawn, alg, inst,
 893                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 894
 895         if (err)
 896                 goto err_free_inst;
 897
 898         return inst;
 899
 900 err_free_inst:
 901         kfree(inst);
 902         inst = ERR_PTR(err);
 903
 904 out:
 905         return inst;
 906 }
 907 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 908
 909 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 910 {
 911         INIT_LIST_HEAD(&queue->list);
 912         queue->backlog = &queue->list;
 913         queue->qlen = 0;
 914         queue->max_qlen = max_qlen;
 915 }
 916 EXPORT_SYMBOL_GPL(crypto_init_queue);
 917
 918 int crypto_enqueue_request(struct crypto_queue *queue,
 919                            struct crypto_async_request *request)
 920 {
 921         int err = -EINPROGRESS;
 922
 923         if (unlikely(queue->qlen >= queue->max_qlen)) {
 924                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 925                         err = -ENOSPC;
 926                         goto out;
 927                 }
 928                 err = -EBUSY;
 929                 if (queue->backlog == &queue->list)
 930                         queue->backlog = &request->list;
 931         }
 932
 933         queue->qlen++;
 934         list_add_tail(&request->list, &queue->list);
 935
 936 out:
 937         return err;
 938 }
 939 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 940
 941 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 942 {
 943         struct list_head *request;
 944
 945         if (unlikely(!queue->qlen))
 946                 return NULL;
 947
 948         queue->qlen--;
 949
 950         if (queue->backlog != &queue->list)
 951                 queue->backlog = queue->backlog->next;
 952
 953         request = queue->list.next;
 954         list_del(request);
 955
 956         return list_entry(request, struct crypto_async_request, list);
 957 }
 958 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 959
 960 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 961 {
 962         struct crypto_async_request *req;
 963
 964         list_for_each_entry(req, &queue->list, list) {
 965                 if (req->tfm == tfm)
 966                         return 1;
 967         }
 968
 969         return 0;
 970 }
 971 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 972
 973 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 974 {
 975         u8 *b = (a + size);
 976         u8 c;
 977
 978         for (; size; size--) {
 979                 c = *--b + 1;
 980                 *b = c;
 981                 if (c)
 982                         break;
 983         }
 984 }
 985
 986 void crypto_inc(u8 *a, unsigned int size)
 987 {
 988         __be32 *b = (__be32 *)(a + size);
 989         u32 c;
 990
 991         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 992             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 993                 for (; size >= 4; size -= 4) {
 994                         c = be32_to_cpu(*--b) + 1;
 995                         *b = cpu_to_be32(c);
 996                         if (likely(c))
 997                                 return;
 998                 }
 999
1000         crypto_inc_byte(a, size);
1001 }
1002 EXPORT_SYMBOL_GPL(crypto_inc);
1003
1004 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
1005 {
1006         int relalign = 0;
1007
1008         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
1009                 int size = sizeof(unsigned long);
1010                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1011                          ((unsigned long)dst ^ (unsigned long)src2)) &
1012                         (size - 1);
1013
1014                 relalign = d ? 1 << __ffs(d) : size;
1015
1016                 /*
1017                  * If we care about alignment, process as many bytes as
1018                  * needed to advance dst and src to values whose alignments
1019                  * equal their relative alignment. This will allow us to
1020                  * process the remainder of the input using optimal strides.
1021                  */
1022                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1023                         *dst++ = *src1++ ^ *src2++;
1024                         len--;
1025                 }
1026         }
1027
1028         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1029                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1030                 dst += 8;
1031                 src1 += 8;
1032                 src2 += 8;
1033                 len -= 8;
1034         }
1035
1036         while (len >= 4 && !(relalign & 3)) {
1037                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1038                 dst += 4;
1039                 src1 += 4;
1040                 src2 += 4;
1041                 len -= 4;
1042         }
1043
1044         while (len >= 2 && !(relalign & 1)) {
1045                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1046                 dst += 2;
1047                 src1 += 2;
1048                 src2 += 2;
1049                 len -= 2;
1050         }
1051
1052         while (len--)
1053                 *dst++ = *src1++ ^ *src2++;
1054 }
1055 EXPORT_SYMBOL_GPL(__crypto_xor);
1056
1057 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1058 {
1059         return alg->cra_ctxsize +
1060                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1061 }
1062 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1063
1064 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1065                         u32 type, u32 mask)
1066 {
1067         int ret = 0;
1068         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1069
1070         if (!IS_ERR(alg)) {
1071                 crypto_mod_put(alg);
1072                 ret = 1;
1073         }
1074
1075         return ret;
1076 }
1077 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1078
1079 static int __init crypto_algapi_init(void)
1080 {
1081         crypto_init_proc();
1082         return 0;
1083 }
1084
1085 static void __exit crypto_algapi_exit(void)
1086 {
1087         crypto_exit_proc();
1088 }
1089
1090 module_init(crypto_algapi_init);
1091 module_exit(crypto_algapi_exit);
1092
1093 MODULE_LICENSE("GPL");
1094 MODULE_DESCRIPTION("Cryptographic algorithms API");