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_interruptible(&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         err = crypto_check_alg(alg);
 341         if (err)
 342                 return err;
 343
 344         down_write(&crypto_alg_sem);
 345         larval = __crypto_register_alg(alg);
 346         up_write(&crypto_alg_sem);
 347
 348         if (IS_ERR(larval))
 349                 return PTR_ERR(larval);
 350
 351         crypto_wait_for_test(larval);
 352         return 0;
 353 }
 354 EXPORT_SYMBOL_GPL(crypto_register_alg);
 355
 356 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 357 {
 358         if (unlikely(list_empty(&alg->cra_list)))
 359                 return -ENOENT;
 360
 361         alg->cra_flags |= CRYPTO_ALG_DEAD;
 362
 363         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 364         list_del_init(&alg->cra_list);
 365         crypto_remove_spawns(alg, list, NULL);
 366
 367         return 0;
 368 }
 369
 370 int crypto_unregister_alg(struct crypto_alg *alg)
 371 {
 372         int ret;
 373         LIST_HEAD(list);
 374
 375         down_write(&crypto_alg_sem);
 376         ret = crypto_remove_alg(alg, &list);
 377         up_write(&crypto_alg_sem);
 378
 379         if (ret)
 380                 return ret;
 381
 382         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 383         if (alg->cra_destroy)
 384                 alg->cra_destroy(alg);
 385
 386         crypto_remove_final(&list);
 387         return 0;
 388 }
 389 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 390
 391 int crypto_register_algs(struct crypto_alg *algs, int count)
 392 {
 393         int i, ret;
 394
 395         for (i = 0; i < count; i++) {
 396                 ret = crypto_register_alg(&algs[i]);
 397                 if (ret)
 398                         goto err;
 399         }
 400
 401         return 0;
 402
 403 err:
 404         for (--i; i >= 0; --i)
 405                 crypto_unregister_alg(&algs[i]);
 406
 407         return ret;
 408 }
 409 EXPORT_SYMBOL_GPL(crypto_register_algs);
 410
 411 int crypto_unregister_algs(struct crypto_alg *algs, int count)
 412 {
 413         int i, ret;
 414
 415         for (i = 0; i < count; i++) {
 416                 ret = crypto_unregister_alg(&algs[i]);
 417                 if (ret)
 418                         pr_err("Failed to unregister %s %s: %d\n",
 419                                algs[i].cra_driver_name, algs[i].cra_name, ret);
 420         }
 421
 422         return 0;
 423 }
 424 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 425
 426 int crypto_register_template(struct crypto_template *tmpl)
 427 {
 428         struct crypto_template *q;
 429         int err = -EEXIST;
 430
 431         down_write(&crypto_alg_sem);
 432
 433         list_for_each_entry(q, &crypto_template_list, list) {
 434                 if (q == tmpl)
 435                         goto out;
 436         }
 437
 438         list_add(&tmpl->list, &crypto_template_list);
 439         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 440         err = 0;
 441 out:
 442         up_write(&crypto_alg_sem);
 443         return err;
 444 }
 445 EXPORT_SYMBOL_GPL(crypto_register_template);
 446
 447 void crypto_unregister_template(struct crypto_template *tmpl)
 448 {
 449         struct crypto_instance *inst;
 450         struct hlist_node *n;
 451         struct hlist_head *list;
 452         LIST_HEAD(users);
 453
 454         down_write(&crypto_alg_sem);
 455
 456         BUG_ON(list_empty(&tmpl->list));
 457         list_del_init(&tmpl->list);
 458
 459         list = &tmpl->instances;
 460         hlist_for_each_entry(inst, list, list) {
 461                 int err = crypto_remove_alg(&inst->alg, &users);
 462                 BUG_ON(err);
 463         }
 464
 465         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 466
 467         up_write(&crypto_alg_sem);
 468
 469         hlist_for_each_entry_safe(inst, n, list, list) {
 470                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 471                 tmpl->free(inst);
 472         }
 473         crypto_remove_final(&users);
 474 }
 475 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 476
 477 static struct crypto_template *__crypto_lookup_template(const char *name)
 478 {
 479         struct crypto_template *q, *tmpl = NULL;
 480
 481         down_read(&crypto_alg_sem);
 482         list_for_each_entry(q, &crypto_template_list, list) {
 483                 if (strcmp(q->name, name))
 484                         continue;
 485                 if (unlikely(!crypto_tmpl_get(q)))
 486                         continue;
 487
 488                 tmpl = q;
 489                 break;
 490         }
 491         up_read(&crypto_alg_sem);
 492
 493         return tmpl;
 494 }
 495
 496 struct crypto_template *crypto_lookup_template(const char *name)
 497 {
 498         return try_then_request_module(__crypto_lookup_template(name),
 499                                        "crypto-%s", name);
 500 }
 501 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 502
 503 int crypto_register_instance(struct crypto_template *tmpl,
 504                              struct crypto_instance *inst)
 505 {
 506         struct crypto_larval *larval;
 507         int err;
 508
 509         err = crypto_check_alg(&inst->alg);
 510         if (err)
 511                 goto err;
 512
 513         inst->alg.cra_module = tmpl->module;
 514         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 515
 516         down_write(&crypto_alg_sem);
 517
 518         larval = __crypto_register_alg(&inst->alg);
 519         if (IS_ERR(larval))
 520                 goto unlock;
 521
 522         hlist_add_head(&inst->list, &tmpl->instances);
 523         inst->tmpl = tmpl;
 524
 525 unlock:
 526         up_write(&crypto_alg_sem);
 527
 528         err = PTR_ERR(larval);
 529         if (IS_ERR(larval))
 530                 goto err;
 531
 532         crypto_wait_for_test(larval);
 533         err = 0;
 534
 535 err:
 536         return err;
 537 }
 538 EXPORT_SYMBOL_GPL(crypto_register_instance);
 539
 540 int crypto_unregister_instance(struct crypto_alg *alg)
 541 {
 542         int err;
 543         struct crypto_instance *inst = (void *)alg;
 544         struct crypto_template *tmpl = inst->tmpl;
 545         LIST_HEAD(users);
 546
 547         if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
 548                 return -EINVAL;
 549
 550         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 551
 552         down_write(&crypto_alg_sem);
 553
 554         hlist_del_init(&inst->list);
 555         err = crypto_remove_alg(alg, &users);
 556
 557         up_write(&crypto_alg_sem);
 558
 559         if (err)
 560                 return err;
 561
 562         tmpl->free(inst);
 563         crypto_remove_final(&users);
 564
 565         return 0;
 566 }
 567 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 568
 569 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 570                       struct crypto_instance *inst, u32 mask)
 571 {
 572         int err = -EAGAIN;
 573
 574         spawn->inst = inst;
 575         spawn->mask = mask;
 576
 577         down_write(&crypto_alg_sem);
 578         if (!crypto_is_moribund(alg)) {
 579                 list_add(&spawn->list, &alg->cra_users);
 580                 spawn->alg = alg;
 581                 err = 0;
 582         }
 583         up_write(&crypto_alg_sem);
 584
 585         return err;
 586 }
 587 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 588
 589 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 590                        struct crypto_instance *inst,
 591                        const struct crypto_type *frontend)
 592 {
 593         int err = -EINVAL;
 594
 595         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 596                 goto out;
 597
 598         spawn->frontend = frontend;
 599         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 600
 601 out:
 602         return err;
 603 }
 604 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 605
 606 void crypto_drop_spawn(struct crypto_spawn *spawn)
 607 {
 608         if (!spawn->alg)
 609                 return;
 610
 611         down_write(&crypto_alg_sem);
 612         list_del(&spawn->list);
 613         up_write(&crypto_alg_sem);
 614 }
 615 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 616
 617 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 618 {
 619         struct crypto_alg *alg;
 620         struct crypto_alg *alg2;
 621
 622         down_read(&crypto_alg_sem);
 623         alg = spawn->alg;
 624         alg2 = alg;
 625         if (alg2)
 626                 alg2 = crypto_mod_get(alg2);
 627         up_read(&crypto_alg_sem);
 628
 629         if (!alg2) {
 630                 if (alg)
 631                         crypto_shoot_alg(alg);
 632                 return ERR_PTR(-EAGAIN);
 633         }
 634
 635         return alg;
 636 }
 637
 638 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 639                                     u32 mask)
 640 {
 641         struct crypto_alg *alg;
 642         struct crypto_tfm *tfm;
 643
 644         alg = crypto_spawn_alg(spawn);
 645         if (IS_ERR(alg))
 646                 return ERR_CAST(alg);
 647
 648         tfm = ERR_PTR(-EINVAL);
 649         if (unlikely((alg->cra_flags ^ type) & mask))
 650                 goto out_put_alg;
 651
 652         tfm = __crypto_alloc_tfm(alg, type, mask);
 653         if (IS_ERR(tfm))
 654                 goto out_put_alg;
 655
 656         return tfm;
 657
 658 out_put_alg:
 659         crypto_mod_put(alg);
 660         return tfm;
 661 }
 662 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 663
 664 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 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 = crypto_create_tfm(alg, spawn->frontend);
 674         if (IS_ERR(tfm))
 675                 goto out_put_alg;
 676
 677         return tfm;
 678
 679 out_put_alg:
 680         crypto_mod_put(alg);
 681         return tfm;
 682 }
 683 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 684
 685 int crypto_register_notifier(struct notifier_block *nb)
 686 {
 687         return srcu_notifier_chain_register(&crypto_chain, nb);
 688 }
 689 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 690
 691 int crypto_unregister_notifier(struct notifier_block *nb)
 692 {
 693         return srcu_notifier_chain_unregister(&crypto_chain, nb);
 694 }
 695 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 696
 697 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 698 {
 699         struct rtattr *rta = tb[0];
 700         struct crypto_attr_type *algt;
 701
 702         if (!rta)
 703                 return ERR_PTR(-ENOENT);
 704         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 705                 return ERR_PTR(-EINVAL);
 706         if (rta->rta_type != CRYPTOA_TYPE)
 707                 return ERR_PTR(-EINVAL);
 708
 709         algt = RTA_DATA(rta);
 710
 711         return algt;
 712 }
 713 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 714
 715 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 716 {
 717         struct crypto_attr_type *algt;
 718
 719         algt = crypto_get_attr_type(tb);
 720         if (IS_ERR(algt))
 721                 return PTR_ERR(algt);
 722
 723         if ((algt->type ^ type) & algt->mask)
 724                 return -EINVAL;
 725
 726         return 0;
 727 }
 728 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 729
 730 const char *crypto_attr_alg_name(struct rtattr *rta)
 731 {
 732         struct crypto_attr_alg *alga;
 733
 734         if (!rta)
 735                 return ERR_PTR(-ENOENT);
 736         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 737                 return ERR_PTR(-EINVAL);
 738         if (rta->rta_type != CRYPTOA_ALG)
 739                 return ERR_PTR(-EINVAL);
 740
 741         alga = RTA_DATA(rta);
 742         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 743
 744         return alga->name;
 745 }
 746 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 747
 748 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 749                                     const struct crypto_type *frontend,
 750                                     u32 type, u32 mask)
 751 {
 752         const char *name;
 753
 754         name = crypto_attr_alg_name(rta);
 755         if (IS_ERR(name))
 756                 return ERR_CAST(name);
 757
 758         return crypto_find_alg(name, frontend, type, mask);
 759 }
 760 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 761
 762 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 763 {
 764         struct crypto_attr_u32 *nu32;
 765
 766         if (!rta)
 767                 return -ENOENT;
 768         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 769                 return -EINVAL;
 770         if (rta->rta_type != CRYPTOA_U32)
 771                 return -EINVAL;
 772
 773         nu32 = RTA_DATA(rta);
 774         *num = nu32->num;
 775
 776         return 0;
 777 }
 778 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 779
 780 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 781                              unsigned int head)
 782 {
 783         struct crypto_instance *inst;
 784         char *p;
 785         int err;
 786
 787         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 788                     GFP_KERNEL);
 789         if (!p)
 790                 return ERR_PTR(-ENOMEM);
 791
 792         inst = (void *)(p + head);
 793
 794         err = -ENAMETOOLONG;
 795         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 796                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 797                 goto err_free_inst;
 798
 799         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 800                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 801                 goto err_free_inst;
 802
 803         return p;
 804
 805 err_free_inst:
 806         kfree(p);
 807         return ERR_PTR(err);
 808 }
 809 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 810
 811 struct crypto_instance *crypto_alloc_instance(const char *name,
 812                                               struct crypto_alg *alg)
 813 {
 814         struct crypto_instance *inst;
 815         struct crypto_spawn *spawn;
 816         int err;
 817
 818         inst = crypto_alloc_instance2(name, alg, 0);
 819         if (IS_ERR(inst))
 820                 goto out;
 821
 822         spawn = crypto_instance_ctx(inst);
 823         err = crypto_init_spawn(spawn, alg, inst,
 824                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 825
 826         if (err)
 827                 goto err_free_inst;
 828
 829         return inst;
 830
 831 err_free_inst:
 832         kfree(inst);
 833         inst = ERR_PTR(err);
 834
 835 out:
 836         return inst;
 837 }
 838 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 839
 840 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 841 {
 842         INIT_LIST_HEAD(&queue->list);
 843         queue->backlog = &queue->list;
 844         queue->qlen = 0;
 845         queue->max_qlen = max_qlen;
 846 }
 847 EXPORT_SYMBOL_GPL(crypto_init_queue);
 848
 849 int crypto_enqueue_request(struct crypto_queue *queue,
 850                            struct crypto_async_request *request)
 851 {
 852         int err = -EINPROGRESS;
 853
 854         if (unlikely(queue->qlen >= queue->max_qlen)) {
 855                 err = -EBUSY;
 856                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 857                         goto out;
 858                 if (queue->backlog == &queue->list)
 859                         queue->backlog = &request->list;
 860         }
 861
 862         queue->qlen++;
 863         list_add_tail(&request->list, &queue->list);
 864
 865 out:
 866         return err;
 867 }
 868 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 869
 870 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 871 {
 872         struct list_head *request;
 873
 874         if (unlikely(!queue->qlen))
 875                 return NULL;
 876
 877         queue->qlen--;
 878
 879         if (queue->backlog != &queue->list)
 880                 queue->backlog = queue->backlog->next;
 881
 882         request = queue->list.next;
 883         list_del(request);
 884
 885         return (char *)list_entry(request, struct crypto_async_request, list) -
 886                offset;
 887 }
 888 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 889
 890 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 891 {
 892         return __crypto_dequeue_request(queue, 0);
 893 }
 894 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 895
 896 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 897 {
 898         struct crypto_async_request *req;
 899
 900         list_for_each_entry(req, &queue->list, list) {
 901                 if (req->tfm == tfm)
 902                         return 1;
 903         }
 904
 905         return 0;
 906 }
 907 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 908
 909 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 910 {
 911         u8 *b = (a + size);
 912         u8 c;
 913
 914         for (; size; size--) {
 915                 c = *--b + 1;
 916                 *b = c;
 917                 if (c)
 918                         break;
 919         }
 920 }
 921
 922 void crypto_inc(u8 *a, unsigned int size)
 923 {
 924         __be32 *b = (__be32 *)(a + size);
 925         u32 c;
 926
 927         for (; size >= 4; size -= 4) {
 928                 c = be32_to_cpu(*--b) + 1;
 929                 *b = cpu_to_be32(c);
 930                 if (c)
 931                         return;
 932         }
 933
 934         crypto_inc_byte(a, size);
 935 }
 936 EXPORT_SYMBOL_GPL(crypto_inc);
 937
 938 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 939 {
 940         for (; size; size--)
 941                 *a++ ^= *b++;
 942 }
 943
 944 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 945 {
 946         u32 *a = (u32 *)dst;
 947         u32 *b = (u32 *)src;
 948
 949         for (; size >= 4; size -= 4)
 950                 *a++ ^= *b++;
 951
 952         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 953 }
 954 EXPORT_SYMBOL_GPL(crypto_xor);
 955
 956 static int __init crypto_algapi_init(void)
 957 {
 958         crypto_init_proc();
 959         return 0;
 960 }
 961
 962 static void __exit crypto_algapi_exit(void)
 963 {
 964         crypto_exit_proc();
 965 }
 966
 967 module_init(crypto_algapi_init);
 968 module_exit(crypto_algapi_exit);
 969
 970 MODULE_LICENSE("GPL");
 971 MODULE_DESCRIPTION("Cryptographic algorithms API");