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