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