SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 void crypto_remove_spawn(struct crypto_spawn *spawn,
  85                                 struct list_head *list,
  86                                 struct list_head *secondary_spawns)
  87 {
  88         struct crypto_instance *inst = spawn->inst;
  89         struct crypto_template *tmpl = inst->tmpl;
  90
  91         list_del_init(&spawn->list);
  92         spawn->alg = NULL;
  93
  94         if (crypto_is_dead(&inst->alg))
  95                 return;
  96
  97         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
  98         if (hlist_unhashed(&inst->list))
  99                 return;
 100
 101         if (!tmpl || !crypto_tmpl_get(tmpl))
 102                 return;
 103
 104         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 105         list_move(&inst->alg.cra_list, list);
 106         hlist_del(&inst->list);
 107         inst->alg.cra_destroy = crypto_destroy_instance;
 108
 109         list_splice(&inst->alg.cra_users, secondary_spawns);
 110 }
 111
 112 static void crypto_remove_spawns(struct list_head *spawns,
 113                                  struct list_head *list, u32 new_type)
 114 {
 115         struct crypto_spawn *spawn, *n;
 116         LIST_HEAD(secondary_spawns);
 117
 118         list_for_each_entry_safe(spawn, n, spawns, list) {
 119                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 120                         continue;
 121
 122                 crypto_remove_spawn(spawn, list, &secondary_spawns);
 123         }
 124
 125         while (!list_empty(&secondary_spawns)) {
 126                 list_for_each_entry_safe(spawn, n, &secondary_spawns, list)
 127                         crypto_remove_spawn(spawn, list, &secondary_spawns);
 128         }
 129 }
 130
 131 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 132 {
 133         struct crypto_alg *q;
 134         struct crypto_larval *larval;
 135         int ret = -EAGAIN;
 136
 137         if (crypto_is_dead(alg))
 138                 goto err;
 139
 140         INIT_LIST_HEAD(&alg->cra_users);
 141
 142         /* No cheating! */
 143         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 144
 145         ret = -EEXIST;
 146
 147         atomic_set(&alg->cra_refcnt, 1);
 148         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 149                 if (q == alg)
 150                         goto err;
 151
 152                 if (crypto_is_moribund(q))
 153                         continue;
 154
 155                 if (crypto_is_larval(q)) {
 156                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 157                                 goto err;
 158                         continue;
 159                 }
 160
 161                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 162                     !strcmp(q->cra_name, alg->cra_driver_name))
 163                         goto err;
 164         }
 165
 166         larval = crypto_larval_alloc(alg->cra_name,
 167                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 168         if (IS_ERR(larval))
 169                 goto out;
 170
 171         ret = -ENOENT;
 172         larval->adult = crypto_mod_get(alg);
 173         if (!larval->adult)
 174                 goto free_larval;
 175
 176         atomic_set(&larval->alg.cra_refcnt, 1);
 177         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 178                CRYPTO_MAX_ALG_NAME);
 179         larval->alg.cra_priority = alg->cra_priority;
 180
 181         list_add(&alg->cra_list, &crypto_alg_list);
 182         list_add(&larval->alg.cra_list, &crypto_alg_list);
 183
 184 out:
 185         return larval;
 186
 187 free_larval:
 188         kfree(larval);
 189 err:
 190         larval = ERR_PTR(ret);
 191         goto out;
 192 }
 193
 194 void crypto_alg_tested(const char *name, int err)
 195 {
 196         struct crypto_larval *test;
 197         struct crypto_alg *alg;
 198         struct crypto_alg *q;
 199         LIST_HEAD(list);
 200
 201         down_write(&crypto_alg_sem);
 202         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 203                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 204                         continue;
 205
 206                 test = (struct crypto_larval *)q;
 207
 208                 if (!strcmp(q->cra_driver_name, name))
 209                         goto found;
 210         }
 211
 212         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 213         goto unlock;
 214
 215 found:
 216         q->cra_flags |= CRYPTO_ALG_DEAD;
 217         alg = test->adult;
 218         if (err || list_empty(&alg->cra_list))
 219                 goto complete;
 220
 221         alg->cra_flags |= CRYPTO_ALG_TESTED;
 222
 223         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 224                 if (q == alg)
 225                         continue;
 226
 227                 if (crypto_is_moribund(q))
 228                         continue;
 229
 230                 if (crypto_is_larval(q)) {
 231                         struct crypto_larval *larval = (void *)q;
 232
 233                         /*
 234                          * Check to see if either our generic name or
 235                          * specific name can satisfy the name requested
 236                          * by the larval entry q.
 237                          */
 238                         if (strcmp(alg->cra_name, q->cra_name) &&
 239                             strcmp(alg->cra_driver_name, q->cra_name))
 240                                 continue;
 241
 242                         if (larval->adult)
 243                                 continue;
 244                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 245                                 continue;
 246                         if (!crypto_mod_get(alg))
 247                                 continue;
 248
 249                         larval->adult = alg;
 250                         complete_all(&larval->completion);
 251                         continue;
 252                 }
 253
 254                 if (strcmp(alg->cra_name, q->cra_name))
 255                         continue;
 256
 257                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 258                     q->cra_priority > alg->cra_priority)
 259                         continue;
 260
 261                 crypto_remove_spawns(&q->cra_users, &list, alg->cra_flags);
 262         }
 263
 264 complete:
 265         complete_all(&test->completion);
 266
 267 unlock:
 268         up_write(&crypto_alg_sem);
 269
 270         crypto_remove_final(&list);
 271 }
 272 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 273
 274 static void crypto_remove_final(struct list_head *list)
 275 {
 276         struct crypto_alg *alg;
 277         struct crypto_alg *n;
 278
 279         list_for_each_entry_safe(alg, n, list, cra_list) {
 280                 list_del_init(&alg->cra_list);
 281                 crypto_alg_put(alg);
 282         }
 283 }
 284
 285 static void crypto_wait_for_test(struct crypto_larval *larval)
 286 {
 287         int err;
 288
 289         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 290         if (err != NOTIFY_STOP) {
 291                 if (WARN_ON(err != NOTIFY_DONE))
 292                         goto out;
 293                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 294         }
 295
 296         err = wait_for_completion_interruptible(&larval->completion);
 297         WARN_ON(err);
 298
 299 out:
 300         crypto_larval_kill(&larval->alg);
 301 }
 302
 303 int crypto_register_alg(struct crypto_alg *alg)
 304 {
 305         struct crypto_larval *larval;
 306         int err;
 307
 308         err = crypto_check_alg(alg);
 309         if (err)
 310                 return err;
 311
 312         down_write(&crypto_alg_sem);
 313         larval = __crypto_register_alg(alg);
 314         up_write(&crypto_alg_sem);
 315
 316         if (IS_ERR(larval))
 317                 return PTR_ERR(larval);
 318
 319         crypto_wait_for_test(larval);
 320         return 0;
 321 }
 322 EXPORT_SYMBOL_GPL(crypto_register_alg);
 323
 324 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 325 {
 326         if (unlikely(list_empty(&alg->cra_list)))
 327                 return -ENOENT;
 328
 329         alg->cra_flags |= CRYPTO_ALG_DEAD;
 330
 331         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 332         list_del_init(&alg->cra_list);
 333         crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags);
 334
 335         return 0;
 336 }
 337
 338 int crypto_unregister_alg(struct crypto_alg *alg)
 339 {
 340         int ret;
 341         LIST_HEAD(list);
 342
 343         down_write(&crypto_alg_sem);
 344         ret = crypto_remove_alg(alg, &list);
 345         up_write(&crypto_alg_sem);
 346
 347         if (ret)
 348                 return ret;
 349
 350         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 351         if (alg->cra_destroy)
 352                 alg->cra_destroy(alg);
 353
 354         crypto_remove_final(&list);
 355         return 0;
 356 }
 357 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 358
 359 int crypto_register_template(struct crypto_template *tmpl)
 360 {
 361         struct crypto_template *q;
 362         int err = -EEXIST;
 363
 364         down_write(&crypto_alg_sem);
 365
 366         list_for_each_entry(q, &crypto_template_list, list) {
 367                 if (q == tmpl)
 368                         goto out;
 369         }
 370
 371         list_add(&tmpl->list, &crypto_template_list);
 372         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 373         err = 0;
 374 out:
 375         up_write(&crypto_alg_sem);
 376         return err;
 377 }
 378 EXPORT_SYMBOL_GPL(crypto_register_template);
 379
 380 void crypto_unregister_template(struct crypto_template *tmpl)
 381 {
 382         struct crypto_instance *inst;
 383         struct hlist_node *p, *n;
 384         struct hlist_head *list;
 385         LIST_HEAD(users);
 386
 387         down_write(&crypto_alg_sem);
 388
 389         BUG_ON(list_empty(&tmpl->list));
 390         list_del_init(&tmpl->list);
 391
 392         list = &tmpl->instances;
 393         hlist_for_each_entry(inst, p, list, list) {
 394                 int err = crypto_remove_alg(&inst->alg, &users);
 395                 BUG_ON(err);
 396         }
 397
 398         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 399
 400         up_write(&crypto_alg_sem);
 401
 402         hlist_for_each_entry_safe(inst, p, n, list, list) {
 403                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 404                 tmpl->free(inst);
 405         }
 406         crypto_remove_final(&users);
 407 }
 408 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 409
 410 static struct crypto_template *__crypto_lookup_template(const char *name)
 411 {
 412         struct crypto_template *q, *tmpl = NULL;
 413
 414         down_read(&crypto_alg_sem);
 415         list_for_each_entry(q, &crypto_template_list, list) {
 416                 if (strcmp(q->name, name))
 417                         continue;
 418                 if (unlikely(!crypto_tmpl_get(q)))
 419                         continue;
 420
 421                 tmpl = q;
 422                 break;
 423         }
 424         up_read(&crypto_alg_sem);
 425
 426         return tmpl;
 427 }
 428
 429 struct crypto_template *crypto_lookup_template(const char *name)
 430 {
 431         return try_then_request_module(__crypto_lookup_template(name), name);
 432 }
 433 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 434
 435 int crypto_register_instance(struct crypto_template *tmpl,
 436                              struct crypto_instance *inst)
 437 {
 438         struct crypto_larval *larval;
 439         int err;
 440
 441         err = crypto_check_alg(&inst->alg);
 442         if (err)
 443                 goto err;
 444
 445         inst->alg.cra_module = tmpl->module;
 446
 447         down_write(&crypto_alg_sem);
 448
 449         larval = __crypto_register_alg(&inst->alg);
 450         if (IS_ERR(larval))
 451                 goto unlock;
 452
 453         hlist_add_head(&inst->list, &tmpl->instances);
 454         inst->tmpl = tmpl;
 455
 456 unlock:
 457         up_write(&crypto_alg_sem);
 458
 459         err = PTR_ERR(larval);
 460         if (IS_ERR(larval))
 461                 goto err;
 462
 463         crypto_wait_for_test(larval);
 464         err = 0;
 465
 466 err:
 467         return err;
 468 }
 469 EXPORT_SYMBOL_GPL(crypto_register_instance);
 470
 471 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 472                       struct crypto_instance *inst, u32 mask)
 473 {
 474         int err = -EAGAIN;
 475
 476         spawn->inst = inst;
 477         spawn->mask = mask;
 478
 479         down_write(&crypto_alg_sem);
 480         if (!crypto_is_moribund(alg)) {
 481                 list_add(&spawn->list, &alg->cra_users);
 482                 spawn->alg = alg;
 483                 err = 0;
 484         }
 485         up_write(&crypto_alg_sem);
 486
 487         return err;
 488 }
 489 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 490
 491 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 492                        struct crypto_instance *inst,
 493                        const struct crypto_type *frontend)
 494 {
 495         int err = -EINVAL;
 496
 497         if (frontend && (alg->cra_flags ^ frontend->type) & frontend->maskset)
 498                 goto out;
 499
 500         spawn->frontend = frontend;
 501         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 502
 503 out:
 504         return err;
 505 }
 506 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 507
 508 void crypto_drop_spawn(struct crypto_spawn *spawn)
 509 {
 510         if (!spawn->alg)
 511                 return;
 512
 513         down_write(&crypto_alg_sem);
 514         list_del(&spawn->list);
 515         up_write(&crypto_alg_sem);
 516 }
 517 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 518
 519 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 520 {
 521         struct crypto_alg *alg;
 522         struct crypto_alg *alg2;
 523
 524         down_read(&crypto_alg_sem);
 525         alg = spawn->alg;
 526         alg2 = alg;
 527         if (alg2)
 528                 alg2 = crypto_mod_get(alg2);
 529         up_read(&crypto_alg_sem);
 530
 531         if (!alg2) {
 532                 if (alg)
 533                         crypto_shoot_alg(alg);
 534                 return ERR_PTR(-EAGAIN);
 535         }
 536
 537         return alg;
 538 }
 539
 540 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 541                                     u32 mask)
 542 {
 543         struct crypto_alg *alg;
 544         struct crypto_tfm *tfm;
 545
 546         alg = crypto_spawn_alg(spawn);
 547         if (IS_ERR(alg))
 548                 return ERR_CAST(alg);
 549
 550         tfm = ERR_PTR(-EINVAL);
 551         if (unlikely((alg->cra_flags ^ type) & mask))
 552                 goto out_put_alg;
 553
 554         tfm = __crypto_alloc_tfm(alg, type, mask);
 555         if (IS_ERR(tfm))
 556                 goto out_put_alg;
 557
 558         return tfm;
 559
 560 out_put_alg:
 561         crypto_mod_put(alg);
 562         return tfm;
 563 }
 564 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 565
 566 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 567 {
 568         struct crypto_alg *alg;
 569         struct crypto_tfm *tfm;
 570
 571         alg = crypto_spawn_alg(spawn);
 572         if (IS_ERR(alg))
 573                 return ERR_CAST(alg);
 574
 575         tfm = crypto_create_tfm(alg, spawn->frontend);
 576         if (IS_ERR(tfm))
 577                 goto out_put_alg;
 578
 579         return tfm;
 580
 581 out_put_alg:
 582         crypto_mod_put(alg);
 583         return tfm;
 584 }
 585 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 586
 587 int crypto_register_notifier(struct notifier_block *nb)
 588 {
 589         return blocking_notifier_chain_register(&crypto_chain, nb);
 590 }
 591 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 592
 593 int crypto_unregister_notifier(struct notifier_block *nb)
 594 {
 595         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 596 }
 597 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 598
 599 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 600 {
 601         struct rtattr *rta = tb[0];
 602         struct crypto_attr_type *algt;
 603
 604         if (!rta)
 605                 return ERR_PTR(-ENOENT);
 606         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 607                 return ERR_PTR(-EINVAL);
 608         if (rta->rta_type != CRYPTOA_TYPE)
 609                 return ERR_PTR(-EINVAL);
 610
 611         algt = RTA_DATA(rta);
 612
 613         return algt;
 614 }
 615 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 616
 617 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 618 {
 619         struct crypto_attr_type *algt;
 620
 621         algt = crypto_get_attr_type(tb);
 622         if (IS_ERR(algt))
 623                 return PTR_ERR(algt);
 624
 625         if ((algt->type ^ type) & algt->mask)
 626                 return -EINVAL;
 627
 628         return 0;
 629 }
 630 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 631
 632 const char *crypto_attr_alg_name(struct rtattr *rta)
 633 {
 634         struct crypto_attr_alg *alga;
 635
 636         if (!rta)
 637                 return ERR_PTR(-ENOENT);
 638         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 639                 return ERR_PTR(-EINVAL);
 640         if (rta->rta_type != CRYPTOA_ALG)
 641                 return ERR_PTR(-EINVAL);
 642
 643         alga = RTA_DATA(rta);
 644         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 645
 646         return alga->name;
 647 }
 648 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 649
 650 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 651                                     const struct crypto_type *frontend,
 652                                     u32 type, u32 mask)
 653 {
 654         const char *name;
 655         int err;
 656
 657         name = crypto_attr_alg_name(rta);
 658         err = PTR_ERR(name);
 659         if (IS_ERR(name))
 660                 return ERR_PTR(err);
 661
 662         return crypto_find_alg(name, frontend, type, mask);
 663 }
 664 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 665
 666 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 667 {
 668         struct crypto_attr_u32 *nu32;
 669
 670         if (!rta)
 671                 return -ENOENT;
 672         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 673                 return -EINVAL;
 674         if (rta->rta_type != CRYPTOA_U32)
 675                 return -EINVAL;
 676
 677         nu32 = RTA_DATA(rta);
 678         *num = nu32->num;
 679
 680         return 0;
 681 }
 682 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 683
 684 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 685                              unsigned int head)
 686 {
 687         struct crypto_instance *inst;
 688         char *p;
 689         int err;
 690
 691         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 692                     GFP_KERNEL);
 693         if (!p)
 694                 return ERR_PTR(-ENOMEM);
 695
 696         inst = (void *)(p + head);
 697
 698         err = -ENAMETOOLONG;
 699         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 700                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 701                 goto err_free_inst;
 702
 703         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 704                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 705                 goto err_free_inst;
 706
 707         return p;
 708
 709 err_free_inst:
 710         kfree(p);
 711         return ERR_PTR(err);
 712 }
 713 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 714
 715 struct crypto_instance *crypto_alloc_instance(const char *name,
 716                                               struct crypto_alg *alg)
 717 {
 718         struct crypto_instance *inst;
 719         struct crypto_spawn *spawn;
 720         int err;
 721
 722         inst = crypto_alloc_instance2(name, alg, 0);
 723         if (IS_ERR(inst))
 724                 goto out;
 725
 726         spawn = crypto_instance_ctx(inst);
 727         err = crypto_init_spawn(spawn, alg, inst,
 728                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 729
 730         if (err)
 731                 goto err_free_inst;
 732
 733         return inst;
 734
 735 err_free_inst:
 736         kfree(inst);
 737         inst = ERR_PTR(err);
 738
 739 out:
 740         return inst;
 741 }
 742 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 743
 744 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 745 {
 746         INIT_LIST_HEAD(&queue->list);
 747         queue->backlog = &queue->list;
 748         queue->qlen = 0;
 749         queue->max_qlen = max_qlen;
 750 }
 751 EXPORT_SYMBOL_GPL(crypto_init_queue);
 752
 753 int crypto_enqueue_request(struct crypto_queue *queue,
 754                            struct crypto_async_request *request)
 755 {
 756         int err = -EINPROGRESS;
 757
 758         if (unlikely(queue->qlen >= queue->max_qlen)) {
 759                 err = -EBUSY;
 760                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 761                         goto out;
 762                 if (queue->backlog == &queue->list)
 763                         queue->backlog = &request->list;
 764         }
 765
 766         queue->qlen++;
 767         list_add_tail(&request->list, &queue->list);
 768
 769 out:
 770         return err;
 771 }
 772 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 773
 774 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 775 {
 776         struct list_head *request;
 777
 778         if (unlikely(!queue->qlen))
 779                 return NULL;
 780
 781         queue->qlen--;
 782
 783         if (queue->backlog != &queue->list)
 784                 queue->backlog = queue->backlog->next;
 785
 786         request = queue->list.next;
 787         list_del(request);
 788
 789         return list_entry(request, struct crypto_async_request, list);
 790 }
 791 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 792
 793 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 794 {
 795         struct crypto_async_request *req;
 796
 797         list_for_each_entry(req, &queue->list, list) {
 798                 if (req->tfm == tfm)
 799                         return 1;
 800         }
 801
 802         return 0;
 803 }
 804 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 805
 806 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 807 {
 808         u8 *b = (a + size);
 809         u8 c;
 810
 811         for (; size; size--) {
 812                 c = *--b + 1;
 813                 *b = c;
 814                 if (c)
 815                         break;
 816         }
 817 }
 818
 819 void crypto_inc(u8 *a, unsigned int size)
 820 {
 821         __be32 *b = (__be32 *)(a + size);
 822         u32 c;
 823
 824         for (; size >= 4; size -= 4) {
 825                 c = be32_to_cpu(*--b) + 1;
 826                 *b = cpu_to_be32(c);
 827                 if (c)
 828                         return;
 829         }
 830
 831         crypto_inc_byte(a, size);
 832 }
 833 EXPORT_SYMBOL_GPL(crypto_inc);
 834
 835 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 836 {
 837         for (; size; size--)
 838                 *a++ ^= *b++;
 839 }
 840
 841 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 842 {
 843         u32 *a = (u32 *)dst;
 844         u32 *b = (u32 *)src;
 845
 846         for (; size >= 4; size -= 4)
 847                 *a++ ^= *b++;
 848
 849         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 850 }
 851 EXPORT_SYMBOL_GPL(crypto_xor);
 852
 853 static int __init crypto_algapi_init(void)
 854 {
 855         crypto_init_proc();
 856         return 0;
 857 }
 858
 859 static void __exit crypto_algapi_exit(void)
 860 {
 861         crypto_exit_proc();
 862 }
 863
 864 module_init(crypto_algapi_init);
 865 module_exit(crypto_algapi_exit);
 866
 867 MODULE_LICENSE("GPL");
 868 MODULE_DESCRIPTION("Cryptographic algorithms API");