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