crypto/algapi.c

   1 /*
   2  * Cryptographic API for algorithms (i.e., low-level API).
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/errno.h>
  15 #include <linux/fips.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/list.h>
  19 #include <linux/module.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23
  24 #include "internal.h"
  25
  26 static LIST_HEAD(crypto_template_list);
  27
  28 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  29 {
  30         static const char suffix[] = "-generic";
  31         char *driver_name = alg->cra_driver_name;
  32         int len;
  33
  34         if (*driver_name)
  35                 return 0;
  36
  37         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  38         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  39                 return -ENAMETOOLONG;
  40
  41         memcpy(driver_name + len, suffix, sizeof(suffix));
  42         return 0;
  43 }
  44
  45 static inline void crypto_check_module_sig(struct module *mod)
  46 {
  47         if (fips_enabled && mod && !module_sig_ok(mod))
  48                 panic("Module %s signature verification failed in FIPS mode\n",
  49                       module_name(mod));
  50 }
  51
  52 static int crypto_check_alg(struct crypto_alg *alg)
  53 {
  54         crypto_check_module_sig(alg->cra_module);
  55
  56         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  57                 return -EINVAL;
  58
  59         if (alg->cra_blocksize > PAGE_SIZE / 8)
  60                 return -EINVAL;
  61
  62         if (alg->cra_priority < 0)
  63                 return -EINVAL;
  64
  65         atomic_set(&alg->cra_refcnt, 1);
  66
  67         return crypto_set_driver_name(alg);
  68 }
  69
  70 static void crypto_free_instance(struct crypto_instance *inst)
  71 {
  72         if (!inst->alg.cra_type->free) {
  73                 inst->tmpl->free(inst);
  74                 return;
  75         }
  76
  77         inst->alg.cra_type->free(inst);
  78 }
  79
  80 static void crypto_destroy_instance(struct crypto_alg *alg)
  81 {
  82         struct crypto_instance *inst = (void *)alg;
  83         struct crypto_template *tmpl = inst->tmpl;
  84
  85         crypto_free_instance(inst);
  86         crypto_tmpl_put(tmpl);
  87 }
  88
  89 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  90                                             struct list_head *stack,
  91                                             struct list_head *top,
  92                                             struct list_head *secondary_spawns)
  93 {
  94         struct crypto_spawn *spawn, *n;
  95
  96         if (list_empty(stack))
  97                 return NULL;
  98
  99         spawn = list_first_entry(stack, struct crypto_spawn, list);
 100         n = list_entry(spawn->list.next, struct crypto_spawn, list);
 101
 102         if (spawn->alg && &n->list != stack && !n->alg)
 103                 n->alg = (n->list.next == stack) ? alg :
 104                          &list_entry(n->list.next, struct crypto_spawn,
 105                                      list)->inst->alg;
 106
 107         list_move(&spawn->list, secondary_spawns);
 108
 109         return &n->list == stack ? top : &n->inst->alg.cra_users;
 110 }
 111
 112 static void crypto_remove_instance(struct crypto_instance *inst,
 113                                    struct list_head *list)
 114 {
 115         struct crypto_template *tmpl = inst->tmpl;
 116
 117         if (crypto_is_dead(&inst->alg))
 118                 return;
 119
 120         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 121         if (hlist_unhashed(&inst->list))
 122                 return;
 123
 124         if (!tmpl || !crypto_tmpl_get(tmpl))
 125                 return;
 126
 127         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 128         list_move(&inst->alg.cra_list, list);
 129         hlist_del(&inst->list);
 130         inst->alg.cra_destroy = crypto_destroy_instance;
 131
 132         BUG_ON(!list_empty(&inst->alg.cra_users));
 133 }
 134
 135 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 136                           struct crypto_alg *nalg)
 137 {
 138         u32 new_type = (nalg ?: alg)->cra_flags;
 139         struct crypto_spawn *spawn, *n;
 140         LIST_HEAD(secondary_spawns);
 141         struct list_head *spawns;
 142         LIST_HEAD(stack);
 143         LIST_HEAD(top);
 144
 145         spawns = &alg->cra_users;
 146         list_for_each_entry_safe(spawn, n, spawns, list) {
 147                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 148                         continue;
 149
 150                 list_move(&spawn->list, &top);
 151         }
 152
 153         spawns = &top;
 154         do {
 155                 while (!list_empty(spawns)) {
 156                         struct crypto_instance *inst;
 157
 158                         spawn = list_first_entry(spawns, struct crypto_spawn,
 159                                                  list);
 160                         inst = spawn->inst;
 161
 162                         BUG_ON(&inst->alg == alg);
 163
 164                         list_move(&spawn->list, &stack);
 165
 166                         if (&inst->alg == nalg)
 167                                 break;
 168
 169                         spawn->alg = NULL;
 170                         spawns = &inst->alg.cra_users;
 171                 }
 172         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 173                                               &secondary_spawns)));
 174
 175         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 176                 if (spawn->alg)
 177                         list_move(&spawn->list, &spawn->alg->cra_users);
 178                 else
 179                         crypto_remove_instance(spawn->inst, list);
 180         }
 181 }
 182 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 183
 184 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 185 {
 186         struct crypto_alg *q;
 187         struct crypto_larval *larval;
 188         int ret = -EAGAIN;
 189
 190         if (crypto_is_dead(alg))
 191                 goto err;
 192
 193         INIT_LIST_HEAD(&alg->cra_users);
 194
 195         /* No cheating! */
 196         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 197
 198         ret = -EEXIST;
 199
 200         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 201                 if (q == alg)
 202                         goto err;
 203
 204                 if (crypto_is_moribund(q))
 205                         continue;
 206
 207                 if (crypto_is_larval(q)) {
 208                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 209                                 goto err;
 210                         continue;
 211                 }
 212
 213                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 214                     !strcmp(q->cra_name, alg->cra_driver_name))
 215                         goto err;
 216         }
 217
 218         larval = crypto_larval_alloc(alg->cra_name,
 219                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 220         if (IS_ERR(larval))
 221                 goto out;
 222
 223         ret = -ENOENT;
 224         larval->adult = crypto_mod_get(alg);
 225         if (!larval->adult)
 226                 goto free_larval;
 227
 228         atomic_set(&larval->alg.cra_refcnt, 1);
 229         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 230                CRYPTO_MAX_ALG_NAME);
 231         larval->alg.cra_priority = alg->cra_priority;
 232
 233         list_add(&alg->cra_list, &crypto_alg_list);
 234         list_add(&larval->alg.cra_list, &crypto_alg_list);
 235
 236 out:
 237         return larval;
 238
 239 free_larval:
 240         kfree(larval);
 241 err:
 242         larval = ERR_PTR(ret);
 243         goto out;
 244 }
 245
 246 void crypto_alg_tested(const char *name, int err)
 247 {
 248         struct crypto_larval *test;
 249         struct crypto_alg *alg;
 250         struct crypto_alg *q;
 251         LIST_HEAD(list);
 252
 253         down_write(&crypto_alg_sem);
 254         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 255                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 256                         continue;
 257
 258                 test = (struct crypto_larval *)q;
 259
 260                 if (!strcmp(q->cra_driver_name, name))
 261                         goto found;
 262         }
 263
 264         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 265         goto unlock;
 266
 267 found:
 268         q->cra_flags |= CRYPTO_ALG_DEAD;
 269         alg = test->adult;
 270         if (err || list_empty(&alg->cra_list))
 271                 goto complete;
 272
 273         alg->cra_flags |= CRYPTO_ALG_TESTED;
 274
 275         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 276                 if (q == alg)
 277                         continue;
 278
 279                 if (crypto_is_moribund(q))
 280                         continue;
 281
 282                 if (crypto_is_larval(q)) {
 283                         struct crypto_larval *larval = (void *)q;
 284
 285                         /*
 286                          * Check to see if either our generic name or
 287                          * specific name can satisfy the name requested
 288                          * by the larval entry q.
 289                          */
 290                         if (strcmp(alg->cra_name, q->cra_name) &&
 291                             strcmp(alg->cra_driver_name, q->cra_name))
 292                                 continue;
 293
 294                         if (larval->adult)
 295                                 continue;
 296                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 297                                 continue;
 298                         if (!crypto_mod_get(alg))
 299                                 continue;
 300
 301                         larval->adult = alg;
 302                         continue;
 303                 }
 304
 305                 if (strcmp(alg->cra_name, q->cra_name))
 306                         continue;
 307
 308                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 309                     q->cra_priority > alg->cra_priority)
 310                         continue;
 311
 312                 crypto_remove_spawns(q, &list, alg);
 313         }
 314
 315 complete:
 316         complete_all(&test->completion);
 317
 318 unlock:
 319         up_write(&crypto_alg_sem);
 320
 321         crypto_remove_final(&list);
 322 }
 323 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 324
 325 void crypto_remove_final(struct list_head *list)
 326 {
 327         struct crypto_alg *alg;
 328         struct crypto_alg *n;
 329
 330         list_for_each_entry_safe(alg, n, list, cra_list) {
 331                 list_del_init(&alg->cra_list);
 332                 crypto_alg_put(alg);
 333         }
 334 }
 335 EXPORT_SYMBOL_GPL(crypto_remove_final);
 336
 337 static void crypto_wait_for_test(struct crypto_larval *larval)
 338 {
 339         int err;
 340
 341         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 342         if (err != NOTIFY_STOP) {
 343                 if (WARN_ON(err != NOTIFY_DONE))
 344                         goto out;
 345                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 346         }
 347
 348         err = wait_for_completion_interruptible(&larval->completion);
 349         WARN_ON(err);
 350
 351 out:
 352         crypto_larval_kill(&larval->alg);
 353 }
 354
 355 int crypto_register_alg(struct crypto_alg *alg)
 356 {
 357         struct crypto_larval *larval;
 358         int err;
 359
 360         err = crypto_check_alg(alg);
 361         if (err)
 362                 return err;
 363
 364         down_write(&crypto_alg_sem);
 365         larval = __crypto_register_alg(alg);
 366         up_write(&crypto_alg_sem);
 367
 368         if (IS_ERR(larval))
 369                 return PTR_ERR(larval);
 370
 371         crypto_wait_for_test(larval);
 372         return 0;
 373 }
 374 EXPORT_SYMBOL_GPL(crypto_register_alg);
 375
 376 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 377 {
 378         if (unlikely(list_empty(&alg->cra_list)))
 379                 return -ENOENT;
 380
 381         alg->cra_flags |= CRYPTO_ALG_DEAD;
 382
 383         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 384         list_del_init(&alg->cra_list);
 385         crypto_remove_spawns(alg, list, NULL);
 386
 387         return 0;
 388 }
 389
 390 int crypto_unregister_alg(struct crypto_alg *alg)
 391 {
 392         int ret;
 393         LIST_HEAD(list);
 394
 395         down_write(&crypto_alg_sem);
 396         ret = crypto_remove_alg(alg, &list);
 397         up_write(&crypto_alg_sem);
 398
 399         if (ret)
 400                 return ret;
 401
 402         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 403         if (alg->cra_destroy)
 404                 alg->cra_destroy(alg);
 405
 406         crypto_remove_final(&list);
 407         return 0;
 408 }
 409 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 410
 411 int crypto_register_algs(struct crypto_alg *algs, int count)
 412 {
 413         int i, ret;
 414
 415         for (i = 0; i < count; i++) {
 416                 ret = crypto_register_alg(&algs[i]);
 417                 if (ret)
 418                         goto err;
 419         }
 420
 421         return 0;
 422
 423 err:
 424         for (--i; i >= 0; --i)
 425                 crypto_unregister_alg(&algs[i]);
 426
 427         return ret;
 428 }
 429 EXPORT_SYMBOL_GPL(crypto_register_algs);
 430
 431 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 432 {
 433         int i, ret;
 434
 435         for (i = 0; i < count; i++) {
 436                 ret = crypto_unregister_alg(&algs[i]);
 437                 if (ret)
 438                         pr_err("Failed to unregister %s %s: %d\n",
 439                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 440         }
 441
 442         return 0;
 443 }
 444 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 445
 446 int crypto_register_template(struct crypto_template *tmpl)
 447 {
 448         struct crypto_template *q;
 449         int err = -EEXIST;
 450
 451         down_write(&crypto_alg_sem);
 452
 453         crypto_check_module_sig(tmpl->module);
 454
 455         list_for_each_entry(q, &crypto_template_list, list) {
 456                 if (q == tmpl)
 457                         goto out;
 458         }
 459
 460         list_add(&tmpl->list, &crypto_template_list);
 461         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 462         err = 0;
 463 out:
 464         up_write(&crypto_alg_sem);
 465         return err;
 466 }
 467 EXPORT_SYMBOL_GPL(crypto_register_template);
 468
 469 void crypto_unregister_template(struct crypto_template *tmpl)
 470 {
 471         struct crypto_instance *inst;
 472         struct hlist_node *n;
 473         struct hlist_head *list;
 474         LIST_HEAD(users);
 475
 476         down_write(&crypto_alg_sem);
 477
 478         BUG_ON(list_empty(&tmpl->list));
 479         list_del_init(&tmpl->list);
 480
 481         list = &tmpl->instances;
 482         hlist_for_each_entry(inst, list, list) {
 483                 int err = crypto_remove_alg(&inst->alg, &users);
 484
 485                 BUG_ON(err);
 486         }
 487
 488         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 489
 490         up_write(&crypto_alg_sem);
 491
 492         hlist_for_each_entry_safe(inst, n, list, list) {
 493                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 494                 crypto_free_instance(inst);
 495         }
 496         crypto_remove_final(&users);
 497 }
 498 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 499
 500 static struct crypto_template *__crypto_lookup_template(const char *name)
 501 {
 502         struct crypto_template *q, *tmpl = NULL;
 503
 504         down_read(&crypto_alg_sem);
 505         list_for_each_entry(q, &crypto_template_list, list) {
 506                 if (strcmp(q->name, name))
 507                         continue;
 508                 if (unlikely(!crypto_tmpl_get(q)))
 509                         continue;
 510
 511                 tmpl = q;
 512                 break;
 513         }
 514         up_read(&crypto_alg_sem);
 515
 516         return tmpl;
 517 }
 518
 519 struct crypto_template *crypto_lookup_template(const char *name)
 520 {
 521         return try_then_request_module(__crypto_lookup_template(name),
 522                                        "crypto-%s", name);
 523 }
 524 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 525
 526 int crypto_register_instance(struct crypto_template *tmpl,
 527                              struct crypto_instance *inst)
 528 {
 529         struct crypto_larval *larval;
 530         int err;
 531
 532         err = crypto_check_alg(&inst->alg);
 533         if (err)
 534                 return err;
 535
 536         inst->alg.cra_module = tmpl->module;
 537         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 538
 539         if (unlikely(!crypto_mod_get(&inst->alg)))
 540                 return -EAGAIN;
 541
 542         down_write(&crypto_alg_sem);
 543
 544         larval = __crypto_register_alg(&inst->alg);
 545         if (IS_ERR(larval))
 546                 goto unlock;
 547
 548         hlist_add_head(&inst->list, &tmpl->instances);
 549         inst->tmpl = tmpl;
 550
 551 unlock:
 552         up_write(&crypto_alg_sem);
 553
 554         err = PTR_ERR(larval);
 555         if (IS_ERR(larval))
 556                 goto err;
 557
 558         crypto_wait_for_test(larval);
 559
 560         /* Remove instance if test failed */
 561         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 562                 crypto_unregister_instance(inst);
 563         err = 0;
 564
 565 err:
 566         crypto_mod_put(&inst->alg);
 567         return err;
 568 }
 569 EXPORT_SYMBOL_GPL(crypto_register_instance);
 570
 571 int crypto_unregister_instance(struct crypto_instance *inst)
 572 {
 573         LIST_HEAD(list);
 574
 575         down_write(&crypto_alg_sem);
 576
 577         crypto_remove_spawns(&inst->alg, &list, NULL);
 578         crypto_remove_instance(inst, &list);
 579
 580         up_write(&crypto_alg_sem);
 581
 582         crypto_remove_final(&list);
 583
 584         return 0;
 585 }
 586 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 587
 588 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 589                       struct crypto_instance *inst, u32 mask)
 590 {
 591         int err = -EAGAIN;
 592
 593         spawn->inst = inst;
 594         spawn->mask = mask;
 595
 596         down_write(&crypto_alg_sem);
 597         if (!crypto_is_moribund(alg)) {
 598                 list_add(&spawn->list, &alg->cra_users);
 599                 spawn->alg = alg;
 600                 err = 0;
 601         }
 602         up_write(&crypto_alg_sem);
 603
 604         return err;
 605 }
 606 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 607
 608 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 609                        struct crypto_instance *inst,
 610                        const struct crypto_type *frontend)
 611 {
 612         int err = -EINVAL;
 613
 614         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 615                 goto out;
 616
 617         spawn->frontend = frontend;
 618         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 619
 620 out:
 621         return err;
 622 }
 623 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 624
 625 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 626                       u32 type, u32 mask)
 627 {
 628         struct crypto_alg *alg;
 629         int err;
 630
 631         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 632         if (IS_ERR(alg))
 633                 return PTR_ERR(alg);
 634
 635         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 636         crypto_mod_put(alg);
 637         return err;
 638 }
 639 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 640
 641 void crypto_drop_spawn(struct crypto_spawn *spawn)
 642 {
 643         if (!spawn->alg)
 644                 return;
 645
 646         down_write(&crypto_alg_sem);
 647         list_del(&spawn->list);
 648         up_write(&crypto_alg_sem);
 649 }
 650 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 651
 652 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 653 {
 654         struct crypto_alg *alg;
 655         struct crypto_alg *alg2;
 656
 657         down_read(&crypto_alg_sem);
 658         alg = spawn->alg;
 659         alg2 = alg;
 660         if (alg2)
 661                 alg2 = crypto_mod_get(alg2);
 662         up_read(&crypto_alg_sem);
 663
 664         if (!alg2) {
 665                 if (alg)
 666                         crypto_shoot_alg(alg);
 667                 return ERR_PTR(-EAGAIN);
 668         }
 669
 670         return alg;
 671 }
 672
 673 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 674                                     u32 mask)
 675 {
 676         struct crypto_alg *alg;
 677         struct crypto_tfm *tfm;
 678
 679         alg = crypto_spawn_alg(spawn);
 680         if (IS_ERR(alg))
 681                 return ERR_CAST(alg);
 682
 683         tfm = ERR_PTR(-EINVAL);
 684         if (unlikely((alg->cra_flags ^ type) & mask))
 685                 goto out_put_alg;
 686
 687         tfm = __crypto_alloc_tfm(alg, type, mask);
 688         if (IS_ERR(tfm))
 689                 goto out_put_alg;
 690
 691         return tfm;
 692
 693 out_put_alg:
 694         crypto_mod_put(alg);
 695         return tfm;
 696 }
 697 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 698
 699 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 700 {
 701         struct crypto_alg *alg;
 702         struct crypto_tfm *tfm;
 703
 704         alg = crypto_spawn_alg(spawn);
 705         if (IS_ERR(alg))
 706                 return ERR_CAST(alg);
 707
 708         tfm = crypto_create_tfm(alg, spawn->frontend);
 709         if (IS_ERR(tfm))
 710                 goto out_put_alg;
 711
 712         return tfm;
 713
 714 out_put_alg:
 715         crypto_mod_put(alg);
 716         return tfm;
 717 }
 718 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 719
 720 int crypto_register_notifier(struct notifier_block *nb)
 721 {
 722         return blocking_notifier_chain_register(&crypto_chain, nb);
 723 }
 724 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 725
 726 int crypto_unregister_notifier(struct notifier_block *nb)
 727 {
 728         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 729 }
 730 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 731
 732 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 733 {
 734         struct rtattr *rta = tb[0];
 735         struct crypto_attr_type *algt;
 736
 737         if (!rta)
 738                 return ERR_PTR(-ENOENT);
 739         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 740                 return ERR_PTR(-EINVAL);
 741         if (rta->rta_type != CRYPTOA_TYPE)
 742                 return ERR_PTR(-EINVAL);
 743
 744         algt = RTA_DATA(rta);
 745
 746         return algt;
 747 }
 748 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 749
 750 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 751 {
 752         struct crypto_attr_type *algt;
 753
 754         algt = crypto_get_attr_type(tb);
 755         if (IS_ERR(algt))
 756                 return PTR_ERR(algt);
 757
 758         if ((algt->type ^ type) & algt->mask)
 759                 return -EINVAL;
 760
 761         return 0;
 762 }
 763 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 764
 765 const char *crypto_attr_alg_name(struct rtattr *rta)
 766 {
 767         struct crypto_attr_alg *alga;
 768
 769         if (!rta)
 770                 return ERR_PTR(-ENOENT);
 771         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 772                 return ERR_PTR(-EINVAL);
 773         if (rta->rta_type != CRYPTOA_ALG)
 774                 return ERR_PTR(-EINVAL);
 775
 776         alga = RTA_DATA(rta);
 777         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 778
 779         return alga->name;
 780 }
 781 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 782
 783 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 784                                     const struct crypto_type *frontend,
 785                                     u32 type, u32 mask)
 786 {
 787         const char *name;
 788
 789         name = crypto_attr_alg_name(rta);
 790         if (IS_ERR(name))
 791                 return ERR_CAST(name);
 792
 793         return crypto_find_alg(name, frontend, type, mask);
 794 }
 795 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 796
 797 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 798 {
 799         struct crypto_attr_u32 *nu32;
 800
 801         if (!rta)
 802                 return -ENOENT;
 803         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 804                 return -EINVAL;
 805         if (rta->rta_type != CRYPTOA_U32)
 806                 return -EINVAL;
 807
 808         nu32 = RTA_DATA(rta);
 809         *num = nu32->num;
 810
 811         return 0;
 812 }
 813 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 814
 815 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 816                              unsigned int head)
 817 {
 818         struct crypto_instance *inst;
 819         char *p;
 820         int err;
 821
 822         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 823                     GFP_KERNEL);
 824         if (!p)
 825                 return ERR_PTR(-ENOMEM);
 826
 827         inst = (void *)(p + head);
 828
 829         err = -ENAMETOOLONG;
 830         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 831                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 832                 goto err_free_inst;
 833
 834         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 835                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 836                 goto err_free_inst;
 837
 838         return p;
 839
 840 err_free_inst:
 841         kfree(p);
 842         return ERR_PTR(err);
 843 }
 844 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 845
 846 struct crypto_instance *crypto_alloc_instance(const char *name,
 847                                               struct crypto_alg *alg)
 848 {
 849         struct crypto_instance *inst;
 850         struct crypto_spawn *spawn;
 851         int err;
 852
 853         inst = crypto_alloc_instance2(name, alg, 0);
 854         if (IS_ERR(inst))
 855                 goto out;
 856
 857         spawn = crypto_instance_ctx(inst);
 858         err = crypto_init_spawn(spawn, alg, inst,
 859                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 860
 861         if (err)
 862                 goto err_free_inst;
 863
 864         return inst;
 865
 866 err_free_inst:
 867         kfree(inst);
 868         inst = ERR_PTR(err);
 869
 870 out:
 871         return inst;
 872 }
 873 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 874
 875 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 876 {
 877         INIT_LIST_HEAD(&queue->list);
 878         queue->backlog = &queue->list;
 879         queue->qlen = 0;
 880         queue->max_qlen = max_qlen;
 881 }
 882 EXPORT_SYMBOL_GPL(crypto_init_queue);
 883
 884 int crypto_enqueue_request(struct crypto_queue *queue,
 885                            struct crypto_async_request *request)
 886 {
 887         int err = -EINPROGRESS;
 888
 889         if (unlikely(queue->qlen >= queue->max_qlen)) {
 890                 err = -EBUSY;
 891                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 892                         goto out;
 893                 if (queue->backlog == &queue->list)
 894                         queue->backlog = &request->list;
 895         }
 896
 897         queue->qlen++;
 898         list_add_tail(&request->list, &queue->list);
 899
 900 out:
 901         return err;
 902 }
 903 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 904
 905 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 906 {
 907         struct list_head *request;
 908
 909         if (unlikely(!queue->qlen))
 910                 return NULL;
 911
 912         queue->qlen--;
 913
 914         if (queue->backlog != &queue->list)
 915                 queue->backlog = queue->backlog->next;
 916
 917         request = queue->list.next;
 918         list_del(request);
 919
 920         return list_entry(request, struct crypto_async_request, list);
 921 }
 922 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 923
 924 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 925 {
 926         struct crypto_async_request *req;
 927
 928         list_for_each_entry(req, &queue->list, list) {
 929                 if (req->tfm == tfm)
 930                         return 1;
 931         }
 932
 933         return 0;
 934 }
 935 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 936
 937 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 938 {
 939         u8 *b = (a + size);
 940         u8 c;
 941
 942         for (; size; size--) {
 943                 c = *--b + 1;
 944                 *b = c;
 945                 if (c)
 946                         break;
 947         }
 948 }
 949
 950 void crypto_inc(u8 *a, unsigned int size)
 951 {
 952         __be32 *b = (__be32 *)(a + size);
 953         u32 c;
 954
 955         for (; size >= 4; size -= 4) {
 956                 c = be32_to_cpu(*--b) + 1;
 957                 *b = cpu_to_be32(c);
 958                 if (c)
 959                         return;
 960         }
 961
 962         crypto_inc_byte(a, size);
 963 }
 964 EXPORT_SYMBOL_GPL(crypto_inc);
 965
 966 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 967 {
 968         for (; size; size--)
 969                 *a++ ^= *b++;
 970 }
 971
 972 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 973 {
 974         u32 *a = (u32 *)dst;
 975         u32 *b = (u32 *)src;
 976
 977         for (; size >= 4; size -= 4)
 978                 *a++ ^= *b++;
 979
 980         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 981 }
 982 EXPORT_SYMBOL_GPL(crypto_xor);
 983
 984 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 985 {
 986         return alg->cra_ctxsize +
 987                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
 988 }
 989 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
 990
 991 static int __init crypto_algapi_init(void)
 992 {
 993         crypto_init_proc();
 994         return 0;
 995 }
 996
 997 static void __exit crypto_algapi_exit(void)
 998 {
 999         crypto_exit_proc();
1000 }
1001
1002 module_init(crypto_algapi_init);
1003 module_exit(crypto_algapi_exit);
1004
1005 MODULE_LICENSE("GPL");
1006 MODULE_DESCRIPTION("Cryptographic algorithms API");