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