crypto/algapi.c

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