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