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/fips.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/list.h>
  19 #include <linux/module.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23
  24 #include "internal.h"
  25
  26 static LIST_HEAD(crypto_template_list);
  27
  28 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  29 {
  30         static const char suffix[] = "-generic";
  31         char *driver_name = alg->cra_driver_name;
  32         int len;
  33
  34         if (*driver_name)
  35                 return 0;
  36
  37         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  38         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  39                 return -ENAMETOOLONG;
  40
  41         memcpy(driver_name + len, suffix, sizeof(suffix));
  42         return 0;
  43 }
  44
  45 static inline void crypto_check_module_sig(struct module *mod)
  46 {
  47         if (fips_enabled && mod && !module_sig_ok(mod))
  48                 panic("Module %s signature verification failed in FIPS mode\n",
  49                       module_name(mod));
  50 }
  51
  52 static int crypto_check_alg(struct crypto_alg *alg)
  53 {
  54         crypto_check_module_sig(alg->cra_module);
  55
  56         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  57                 return -EINVAL;
  58
  59         if (alg->cra_blocksize > PAGE_SIZE / 8)
  60                 return -EINVAL;
  61
  62         if (alg->cra_priority < 0)
  63                 return -EINVAL;
  64
  65         atomic_set(&alg->cra_refcnt, 1);
  66
  67         return crypto_set_driver_name(alg);
  68 }
  69
  70 static void crypto_destroy_instance(struct crypto_alg *alg)
  71 {
  72         struct crypto_instance *inst = (void *)alg;
  73         struct crypto_template *tmpl = inst->tmpl;
  74
  75         tmpl->free(inst);
  76         crypto_tmpl_put(tmpl);
  77 }
  78
  79 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  80                                             struct list_head *stack,
  81                                             struct list_head *top,
  82                                             struct list_head *secondary_spawns)
  83 {
  84         struct crypto_spawn *spawn, *n;
  85
  86         if (list_empty(stack))
  87                 return NULL;
  88
  89         spawn = list_first_entry(stack, struct crypto_spawn, list);
  90         n = list_entry(spawn->list.next, struct crypto_spawn, list);
  91
  92         if (spawn->alg && &n->list != stack && !n->alg)
  93                 n->alg = (n->list.next == stack) ? alg :
  94                          &list_entry(n->list.next, struct crypto_spawn,
  95                                      list)->inst->alg;
  96
  97         list_move(&spawn->list, secondary_spawns);
  98
  99         return &n->list == stack ? top : &n->inst->alg.cra_users;
 100 }
 101
 102 static void crypto_remove_instance(struct crypto_instance *inst,
 103                                    struct list_head *list)
 104 {
 105         struct crypto_template *tmpl = inst->tmpl;
 106
 107         if (crypto_is_dead(&inst->alg))
 108                 return;
 109
 110         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 111         if (hlist_unhashed(&inst->list))
 112                 return;
 113
 114         if (!tmpl || !crypto_tmpl_get(tmpl))
 115                 return;
 116
 117         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 118         list_move(&inst->alg.cra_list, list);
 119         hlist_del(&inst->list);
 120         inst->alg.cra_destroy = crypto_destroy_instance;
 121
 122         BUG_ON(!list_empty(&inst->alg.cra_users));
 123 }
 124
 125 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 126                           struct crypto_alg *nalg)
 127 {
 128         u32 new_type = (nalg ?: alg)->cra_flags;
 129         struct crypto_spawn *spawn, *n;
 130         LIST_HEAD(secondary_spawns);
 131         struct list_head *spawns;
 132         LIST_HEAD(stack);
 133         LIST_HEAD(top);
 134
 135         spawns = &alg->cra_users;
 136         list_for_each_entry_safe(spawn, n, spawns, list) {
 137                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 138                         continue;
 139
 140                 list_move(&spawn->list, &top);
 141         }
 142
 143         spawns = &top;
 144         do {
 145                 while (!list_empty(spawns)) {
 146                         struct crypto_instance *inst;
 147
 148                         spawn = list_first_entry(spawns, struct crypto_spawn,
 149                                                  list);
 150                         inst = spawn->inst;
 151
 152                         BUG_ON(&inst->alg == alg);
 153
 154                         list_move(&spawn->list, &stack);
 155
 156                         if (&inst->alg == nalg)
 157                                 break;
 158
 159                         spawn->alg = NULL;
 160                         spawns = &inst->alg.cra_users;
 161                 }
 162         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 163                                               &secondary_spawns)));
 164
 165         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 166                 if (spawn->alg)
 167                         list_move(&spawn->list, &spawn->alg->cra_users);
 168                 else
 169                         crypto_remove_instance(spawn->inst, list);
 170         }
 171 }
 172 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 173
 174 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 175 {
 176         struct crypto_alg *q;
 177         struct crypto_larval *larval;
 178         int ret = -EAGAIN;
 179
 180         if (crypto_is_dead(alg))
 181                 goto err;
 182
 183         INIT_LIST_HEAD(&alg->cra_users);
 184
 185         /* No cheating! */
 186         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 187
 188         ret = -EEXIST;
 189
 190         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 191                 if (q == alg)
 192                         goto err;
 193
 194                 if (crypto_is_moribund(q))
 195                         continue;
 196
 197                 if (crypto_is_larval(q)) {
 198                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 199                                 goto err;
 200                         continue;
 201                 }
 202
 203                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 204                     !strcmp(q->cra_name, alg->cra_driver_name))
 205                         goto err;
 206         }
 207
 208         larval = crypto_larval_alloc(alg->cra_name,
 209                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 210         if (IS_ERR(larval))
 211                 goto out;
 212
 213         ret = -ENOENT;
 214         larval->adult = crypto_mod_get(alg);
 215         if (!larval->adult)
 216                 goto free_larval;
 217
 218         atomic_set(&larval->alg.cra_refcnt, 1);
 219         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 220                CRYPTO_MAX_ALG_NAME);
 221         larval->alg.cra_priority = alg->cra_priority;
 222
 223         list_add(&alg->cra_list, &crypto_alg_list);
 224         list_add(&larval->alg.cra_list, &crypto_alg_list);
 225
 226 out:
 227         return larval;
 228
 229 free_larval:
 230         kfree(larval);
 231 err:
 232         larval = ERR_PTR(ret);
 233         goto out;
 234 }
 235
 236 void crypto_alg_tested(const char *name, int err)
 237 {
 238         struct crypto_larval *test;
 239         struct crypto_alg *alg;
 240         struct crypto_alg *q;
 241         LIST_HEAD(list);
 242
 243         down_write(&crypto_alg_sem);
 244         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 245                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 246                         continue;
 247
 248                 test = (struct crypto_larval *)q;
 249
 250                 if (!strcmp(q->cra_driver_name, name))
 251                         goto found;
 252         }
 253
 254         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 255         goto unlock;
 256
 257 found:
 258         q->cra_flags |= CRYPTO_ALG_DEAD;
 259         alg = test->adult;
 260         if (err || list_empty(&alg->cra_list))
 261                 goto complete;
 262
 263         alg->cra_flags |= CRYPTO_ALG_TESTED;
 264
 265         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 266                 if (q == alg)
 267                         continue;
 268
 269                 if (crypto_is_moribund(q))
 270                         continue;
 271
 272                 if (crypto_is_larval(q)) {
 273                         struct crypto_larval *larval = (void *)q;
 274
 275                         /*
 276                          * Check to see if either our generic name or
 277                          * specific name can satisfy the name requested
 278                          * by the larval entry q.
 279                          */
 280                         if (strcmp(alg->cra_name, q->cra_name) &&
 281                             strcmp(alg->cra_driver_name, q->cra_name))
 282                                 continue;
 283
 284                         if (larval->adult)
 285                                 continue;
 286                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 287                                 continue;
 288                         if (!crypto_mod_get(alg))
 289                                 continue;
 290
 291                         larval->adult = alg;
 292                         continue;
 293                 }
 294
 295                 if (strcmp(alg->cra_name, q->cra_name))
 296                         continue;
 297
 298                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 299                     q->cra_priority > alg->cra_priority)
 300                         continue;
 301
 302                 crypto_remove_spawns(q, &list, alg);
 303         }
 304
 305 complete:
 306         complete_all(&test->completion);
 307
 308 unlock:
 309         up_write(&crypto_alg_sem);
 310
 311         crypto_remove_final(&list);
 312 }
 313 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 314
 315 void crypto_remove_final(struct list_head *list)
 316 {
 317         struct crypto_alg *alg;
 318         struct crypto_alg *n;
 319
 320         list_for_each_entry_safe(alg, n, list, cra_list) {
 321                 list_del_init(&alg->cra_list);
 322                 crypto_alg_put(alg);
 323         }
 324 }
 325 EXPORT_SYMBOL_GPL(crypto_remove_final);
 326
 327 static void crypto_wait_for_test(struct crypto_larval *larval)
 328 {
 329         int err;
 330
 331         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 332         if (err != NOTIFY_STOP) {
 333                 if (WARN_ON(err != NOTIFY_DONE))
 334                         goto out;
 335                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 336         }
 337
 338         err = wait_for_completion_interruptible(&larval->completion);
 339         WARN_ON(err);
 340
 341 out:
 342         crypto_larval_kill(&larval->alg);
 343 }
 344
 345 int crypto_register_alg(struct crypto_alg *alg)
 346 {
 347         struct crypto_larval *larval;
 348         int err;
 349
 350         err = crypto_check_alg(alg);
 351         if (err)
 352                 return err;
 353
 354         down_write(&crypto_alg_sem);
 355         larval = __crypto_register_alg(alg);
 356         up_write(&crypto_alg_sem);
 357
 358         if (IS_ERR(larval))
 359                 return PTR_ERR(larval);
 360
 361         crypto_wait_for_test(larval);
 362         return 0;
 363 }
 364 EXPORT_SYMBOL_GPL(crypto_register_alg);
 365
 366 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 367 {
 368         if (unlikely(list_empty(&alg->cra_list)))
 369                 return -ENOENT;
 370
 371         alg->cra_flags |= CRYPTO_ALG_DEAD;
 372
 373         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 374         list_del_init(&alg->cra_list);
 375         crypto_remove_spawns(alg, list, NULL);
 376
 377         return 0;
 378 }
 379
 380 int crypto_unregister_alg(struct crypto_alg *alg)
 381 {
 382         int ret;
 383         LIST_HEAD(list);
 384
 385         down_write(&crypto_alg_sem);
 386         ret = crypto_remove_alg(alg, &list);
 387         up_write(&crypto_alg_sem);
 388
 389         if (ret)
 390                 return ret;
 391
 392         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 393         if (alg->cra_destroy)
 394                 alg->cra_destroy(alg);
 395
 396         crypto_remove_final(&list);
 397         return 0;
 398 }
 399 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 400
 401 int crypto_register_algs(struct crypto_alg *algs, int count)
 402 {
 403         int i, ret;
 404
 405         for (i = 0; i < count; i++) {
 406                 ret = crypto_register_alg(&algs[i]);
 407                 if (ret)
 408                         goto err;
 409         }
 410
 411         return 0;
 412
 413 err:
 414         for (--i; i >= 0; --i)
 415                 crypto_unregister_alg(&algs[i]);
 416
 417         return ret;
 418 }
 419 EXPORT_SYMBOL_GPL(crypto_register_algs);
 420
 421 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 422 {
 423         int i, ret;
 424
 425         for (i = 0; i < count; i++) {
 426                 ret = crypto_unregister_alg(&algs[i]);
 427                 if (ret)
 428                         pr_err("Failed to unregister %s %s: %d\n",
 429                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 430         }
 431
 432         return 0;
 433 }
 434 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 435
 436 int crypto_register_template(struct crypto_template *tmpl)
 437 {
 438         struct crypto_template *q;
 439         int err = -EEXIST;
 440
 441         down_write(&crypto_alg_sem);
 442
 443         crypto_check_module_sig(tmpl->module);
 444
 445         list_for_each_entry(q, &crypto_template_list, list) {
 446                 if (q == tmpl)
 447                         goto out;
 448         }
 449
 450         list_add(&tmpl->list, &crypto_template_list);
 451         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 452         err = 0;
 453 out:
 454         up_write(&crypto_alg_sem);
 455         return err;
 456 }
 457 EXPORT_SYMBOL_GPL(crypto_register_template);
 458
 459 void crypto_unregister_template(struct crypto_template *tmpl)
 460 {
 461         struct crypto_instance *inst;
 462         struct hlist_node *n;
 463         struct hlist_head *list;
 464         LIST_HEAD(users);
 465
 466         down_write(&crypto_alg_sem);
 467
 468         BUG_ON(list_empty(&tmpl->list));
 469         list_del_init(&tmpl->list);
 470
 471         list = &tmpl->instances;
 472         hlist_for_each_entry(inst, list, list) {
 473                 int err = crypto_remove_alg(&inst->alg, &users);
 474
 475                 BUG_ON(err);
 476         }
 477
 478         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 479
 480         up_write(&crypto_alg_sem);
 481
 482         hlist_for_each_entry_safe(inst, n, list, list) {
 483                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 484                 tmpl->free(inst);
 485         }
 486         crypto_remove_final(&users);
 487 }
 488 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 489
 490 static struct crypto_template *__crypto_lookup_template(const char *name)
 491 {
 492         struct crypto_template *q, *tmpl = NULL;
 493
 494         down_read(&crypto_alg_sem);
 495         list_for_each_entry(q, &crypto_template_list, list) {
 496                 if (strcmp(q->name, name))
 497                         continue;
 498                 if (unlikely(!crypto_tmpl_get(q)))
 499                         continue;
 500
 501                 tmpl = q;
 502                 break;
 503         }
 504         up_read(&crypto_alg_sem);
 505
 506         return tmpl;
 507 }
 508
 509 struct crypto_template *crypto_lookup_template(const char *name)
 510 {
 511         return try_then_request_module(__crypto_lookup_template(name),
 512                                        "crypto-%s", name);
 513 }
 514 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 515
 516 int crypto_register_instance(struct crypto_template *tmpl,
 517                              struct crypto_instance *inst)
 518 {
 519         struct crypto_larval *larval;
 520         int err;
 521
 522         err = crypto_check_alg(&inst->alg);
 523         if (err)
 524                 return err;
 525
 526         inst->alg.cra_module = tmpl->module;
 527         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 528
 529         if (unlikely(!crypto_mod_get(&inst->alg)))
 530                 return -EAGAIN;
 531
 532         down_write(&crypto_alg_sem);
 533
 534         larval = __crypto_register_alg(&inst->alg);
 535         if (IS_ERR(larval))
 536                 goto unlock;
 537
 538         hlist_add_head(&inst->list, &tmpl->instances);
 539         inst->tmpl = tmpl;
 540
 541 unlock:
 542         up_write(&crypto_alg_sem);
 543
 544         err = PTR_ERR(larval);
 545         if (IS_ERR(larval))
 546                 goto err;
 547
 548         crypto_wait_for_test(larval);
 549
 550         /* Remove instance if test failed */
 551         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 552                 crypto_unregister_instance(inst);
 553         err = 0;
 554
 555 err:
 556         crypto_mod_put(&inst->alg);
 557         return err;
 558 }
 559 EXPORT_SYMBOL_GPL(crypto_register_instance);
 560
 561 int crypto_unregister_instance(struct crypto_instance *inst)
 562 {
 563         LIST_HEAD(list);
 564
 565         down_write(&crypto_alg_sem);
 566
 567         crypto_remove_spawns(&inst->alg, &list, NULL);
 568         crypto_remove_instance(inst, &list);
 569
 570         up_write(&crypto_alg_sem);
 571
 572         crypto_remove_final(&list);
 573
 574         return 0;
 575 }
 576 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 577
 578 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 579                       struct crypto_instance *inst, u32 mask)
 580 {
 581         int err = -EAGAIN;
 582
 583         spawn->inst = inst;
 584         spawn->mask = mask;
 585
 586         down_write(&crypto_alg_sem);
 587         if (!crypto_is_moribund(alg)) {
 588                 list_add(&spawn->list, &alg->cra_users);
 589                 spawn->alg = alg;
 590                 err = 0;
 591         }
 592         up_write(&crypto_alg_sem);
 593
 594         return err;
 595 }
 596 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 597
 598 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 599                        struct crypto_instance *inst,
 600                        const struct crypto_type *frontend)
 601 {
 602         int err = -EINVAL;
 603
 604         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 605                 goto out;
 606
 607         spawn->frontend = frontend;
 608         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 609
 610 out:
 611         return err;
 612 }
 613 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 614
 615 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 616                       u32 type, u32 mask)
 617 {
 618         struct crypto_alg *alg;
 619         int err;
 620
 621         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 622         if (IS_ERR(alg))
 623                 return PTR_ERR(alg);
 624
 625         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 626         crypto_mod_put(alg);
 627         return err;
 628 }
 629 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 630
 631 void crypto_drop_spawn(struct crypto_spawn *spawn)
 632 {
 633         if (!spawn->alg)
 634                 return;
 635
 636         down_write(&crypto_alg_sem);
 637         list_del(&spawn->list);
 638         up_write(&crypto_alg_sem);
 639 }
 640 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 641
 642 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 643 {
 644         struct crypto_alg *alg;
 645         struct crypto_alg *alg2;
 646
 647         down_read(&crypto_alg_sem);
 648         alg = spawn->alg;
 649         alg2 = alg;
 650         if (alg2)
 651                 alg2 = crypto_mod_get(alg2);
 652         up_read(&crypto_alg_sem);
 653
 654         if (!alg2) {
 655                 if (alg)
 656                         crypto_shoot_alg(alg);
 657                 return ERR_PTR(-EAGAIN);
 658         }
 659
 660         return alg;
 661 }
 662
 663 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 664                                     u32 mask)
 665 {
 666         struct crypto_alg *alg;
 667         struct crypto_tfm *tfm;
 668
 669         alg = crypto_spawn_alg(spawn);
 670         if (IS_ERR(alg))
 671                 return ERR_CAST(alg);
 672
 673         tfm = ERR_PTR(-EINVAL);
 674         if (unlikely((alg->cra_flags ^ type) & mask))
 675                 goto out_put_alg;
 676
 677         tfm = __crypto_alloc_tfm(alg, type, mask);
 678         if (IS_ERR(tfm))
 679                 goto out_put_alg;
 680
 681         return tfm;
 682
 683 out_put_alg:
 684         crypto_mod_put(alg);
 685         return tfm;
 686 }
 687 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 688
 689 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 690 {
 691         struct crypto_alg *alg;
 692         struct crypto_tfm *tfm;
 693
 694         alg = crypto_spawn_alg(spawn);
 695         if (IS_ERR(alg))
 696                 return ERR_CAST(alg);
 697
 698         tfm = crypto_create_tfm(alg, spawn->frontend);
 699         if (IS_ERR(tfm))
 700                 goto out_put_alg;
 701
 702         return tfm;
 703
 704 out_put_alg:
 705         crypto_mod_put(alg);
 706         return tfm;
 707 }
 708 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 709
 710 int crypto_register_notifier(struct notifier_block *nb)
 711 {
 712         return blocking_notifier_chain_register(&crypto_chain, nb);
 713 }
 714 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 715
 716 int crypto_unregister_notifier(struct notifier_block *nb)
 717 {
 718         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 719 }
 720 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 721
 722 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 723 {
 724         struct rtattr *rta = tb[0];
 725         struct crypto_attr_type *algt;
 726
 727         if (!rta)
 728                 return ERR_PTR(-ENOENT);
 729         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 730                 return ERR_PTR(-EINVAL);
 731         if (rta->rta_type != CRYPTOA_TYPE)
 732                 return ERR_PTR(-EINVAL);
 733
 734         algt = RTA_DATA(rta);
 735
 736         return algt;
 737 }
 738 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 739
 740 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 741 {
 742         struct crypto_attr_type *algt;
 743
 744         algt = crypto_get_attr_type(tb);
 745         if (IS_ERR(algt))
 746                 return PTR_ERR(algt);
 747
 748         if ((algt->type ^ type) & algt->mask)
 749                 return -EINVAL;
 750
 751         return 0;
 752 }
 753 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 754
 755 const char *crypto_attr_alg_name(struct rtattr *rta)
 756 {
 757         struct crypto_attr_alg *alga;
 758
 759         if (!rta)
 760                 return ERR_PTR(-ENOENT);
 761         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 762                 return ERR_PTR(-EINVAL);
 763         if (rta->rta_type != CRYPTOA_ALG)
 764                 return ERR_PTR(-EINVAL);
 765
 766         alga = RTA_DATA(rta);
 767         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 768
 769         return alga->name;
 770 }
 771 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 772
 773 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 774                                     const struct crypto_type *frontend,
 775                                     u32 type, u32 mask)
 776 {
 777         const char *name;
 778
 779         name = crypto_attr_alg_name(rta);
 780         if (IS_ERR(name))
 781                 return ERR_CAST(name);
 782
 783         return crypto_find_alg(name, frontend, type, mask);
 784 }
 785 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 786
 787 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 788 {
 789         struct crypto_attr_u32 *nu32;
 790
 791         if (!rta)
 792                 return -ENOENT;
 793         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 794                 return -EINVAL;
 795         if (rta->rta_type != CRYPTOA_U32)
 796                 return -EINVAL;
 797
 798         nu32 = RTA_DATA(rta);
 799         *num = nu32->num;
 800
 801         return 0;
 802 }
 803 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 804
 805 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 806                              unsigned int head)
 807 {
 808         struct crypto_instance *inst;
 809         char *p;
 810         int err;
 811
 812         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 813                     GFP_KERNEL);
 814         if (!p)
 815                 return ERR_PTR(-ENOMEM);
 816
 817         inst = (void *)(p + head);
 818
 819         err = -ENAMETOOLONG;
 820         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 821                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 822                 goto err_free_inst;
 823
 824         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 825                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 826                 goto err_free_inst;
 827
 828         return p;
 829
 830 err_free_inst:
 831         kfree(p);
 832         return ERR_PTR(err);
 833 }
 834 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 835
 836 struct crypto_instance *crypto_alloc_instance(const char *name,
 837                                               struct crypto_alg *alg)
 838 {
 839         struct crypto_instance *inst;
 840         struct crypto_spawn *spawn;
 841         int err;
 842
 843         inst = crypto_alloc_instance2(name, alg, 0);
 844         if (IS_ERR(inst))
 845                 goto out;
 846
 847         spawn = crypto_instance_ctx(inst);
 848         err = crypto_init_spawn(spawn, alg, inst,
 849                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 850
 851         if (err)
 852                 goto err_free_inst;
 853
 854         return inst;
 855
 856 err_free_inst:
 857         kfree(inst);
 858         inst = ERR_PTR(err);
 859
 860 out:
 861         return inst;
 862 }
 863 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 864
 865 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 866 {
 867         INIT_LIST_HEAD(&queue->list);
 868         queue->backlog = &queue->list;
 869         queue->qlen = 0;
 870         queue->max_qlen = max_qlen;
 871 }
 872 EXPORT_SYMBOL_GPL(crypto_init_queue);
 873
 874 int crypto_enqueue_request(struct crypto_queue *queue,
 875                            struct crypto_async_request *request)
 876 {
 877         int err = -EINPROGRESS;
 878
 879         if (unlikely(queue->qlen >= queue->max_qlen)) {
 880                 err = -EBUSY;
 881                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 882                         goto out;
 883                 if (queue->backlog == &queue->list)
 884                         queue->backlog = &request->list;
 885         }
 886
 887         queue->qlen++;
 888         list_add_tail(&request->list, &queue->list);
 889
 890 out:
 891         return err;
 892 }
 893 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 894
 895 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 896 {
 897         struct list_head *request;
 898
 899         if (unlikely(!queue->qlen))
 900                 return NULL;
 901
 902         queue->qlen--;
 903
 904         if (queue->backlog != &queue->list)
 905                 queue->backlog = queue->backlog->next;
 906
 907         request = queue->list.next;
 908         list_del(request);
 909
 910         return (char *)list_entry(request, struct crypto_async_request, list) -
 911                offset;
 912 }
 913 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 914
 915 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 916 {
 917         return __crypto_dequeue_request(queue, 0);
 918 }
 919 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 920
 921 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 922 {
 923         struct crypto_async_request *req;
 924
 925         list_for_each_entry(req, &queue->list, list) {
 926                 if (req->tfm == tfm)
 927                         return 1;
 928         }
 929
 930         return 0;
 931 }
 932 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 933
 934 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 935 {
 936         u8 *b = (a + size);
 937         u8 c;
 938
 939         for (; size; size--) {
 940                 c = *--b + 1;
 941                 *b = c;
 942                 if (c)
 943                         break;
 944         }
 945 }
 946
 947 void crypto_inc(u8 *a, unsigned int size)
 948 {
 949         __be32 *b = (__be32 *)(a + size);
 950         u32 c;
 951
 952         for (; size >= 4; size -= 4) {
 953                 c = be32_to_cpu(*--b) + 1;
 954                 *b = cpu_to_be32(c);
 955                 if (c)
 956                         return;
 957         }
 958
 959         crypto_inc_byte(a, size);
 960 }
 961 EXPORT_SYMBOL_GPL(crypto_inc);
 962
 963 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 964 {
 965         for (; size; size--)
 966                 *a++ ^= *b++;
 967 }
 968
 969 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 970 {
 971         u32 *a = (u32 *)dst;
 972         u32 *b = (u32 *)src;
 973
 974         for (; size >= 4; size -= 4)
 975                 *a++ ^= *b++;
 976
 977         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 978 }
 979 EXPORT_SYMBOL_GPL(crypto_xor);
 980
 981 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 982 {
 983         return alg->cra_ctxsize +
 984                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
 985 }
 986 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
 987
 988 static int __init crypto_algapi_init(void)
 989 {
 990         crypto_init_proc();
 991         return 0;
 992 }
 993
 994 static void __exit crypto_algapi_exit(void)
 995 {
 996         crypto_exit_proc();
 997 }
 998
 999 module_init(crypto_algapi_init);
1000 module_exit(crypto_algapi_exit);
1001
1002 MODULE_LICENSE("GPL");
1003 MODULE_DESCRIPTION("Cryptographic algorithms API");