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