linux/crypto/algapi.c
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   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
  26static LIST_HEAD(crypto_template_list);
  27
  28static 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
  45static 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
  52static 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        refcount_set(&alg->cra_refcnt, 1);
  66
  67        return crypto_set_driver_name(alg);
  68}
  69
  70static void crypto_free_instance(struct crypto_instance *inst)
  71{
  72        if (!inst->alg.cra_type->free) {
  73                inst->tmpl->free(inst);
  74                return;
  75        }
  76
  77        inst->alg.cra_type->free(inst);
  78}
  79
  80static void crypto_destroy_instance(struct crypto_alg *alg)
  81{
  82        struct crypto_instance *inst = (void *)alg;
  83        struct crypto_template *tmpl = inst->tmpl;
  84
  85        crypto_free_instance(inst);
  86        crypto_tmpl_put(tmpl);
  87}
  88
  89static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  90                                            struct list_head *stack,
  91                                            struct list_head *top,
  92                                            struct list_head *secondary_spawns)
  93{
  94        struct crypto_spawn *spawn, *n;
  95
  96        spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
  97        if (!spawn)
  98                return NULL;
  99
 100        n = list_next_entry(spawn, list);
 101
 102        if (spawn->alg && &n->list != stack && !n->alg)
 103                n->alg = (n->list.next == stack) ? alg :
 104                         &list_next_entry(n, list)->inst->alg;
 105
 106        list_move(&spawn->list, secondary_spawns);
 107
 108        return &n->list == stack ? top : &n->inst->alg.cra_users;
 109}
 110
 111static void crypto_remove_instance(struct crypto_instance *inst,
 112                                   struct list_head *list)
 113{
 114        struct crypto_template *tmpl = inst->tmpl;
 115
 116        if (crypto_is_dead(&inst->alg))
 117                return;
 118
 119        inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 120        if (hlist_unhashed(&inst->list))
 121                return;
 122
 123        if (!tmpl || !crypto_tmpl_get(tmpl))
 124                return;
 125
 126        list_move(&inst->alg.cra_list, list);
 127        hlist_del(&inst->list);
 128        inst->alg.cra_destroy = crypto_destroy_instance;
 129
 130        BUG_ON(!list_empty(&inst->alg.cra_users));
 131}
 132
 133void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 134                          struct crypto_alg *nalg)
 135{
 136        u32 new_type = (nalg ?: alg)->cra_flags;
 137        struct crypto_spawn *spawn, *n;
 138        LIST_HEAD(secondary_spawns);
 139        struct list_head *spawns;
 140        LIST_HEAD(stack);
 141        LIST_HEAD(top);
 142
 143        spawns = &alg->cra_users;
 144        list_for_each_entry_safe(spawn, n, spawns, list) {
 145                if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 146                        continue;
 147
 148                list_move(&spawn->list, &top);
 149        }
 150
 151        spawns = &top;
 152        do {
 153                while (!list_empty(spawns)) {
 154                        struct crypto_instance *inst;
 155
 156                        spawn = list_first_entry(spawns, struct crypto_spawn,
 157                                                 list);
 158                        inst = spawn->inst;
 159
 160                        BUG_ON(&inst->alg == alg);
 161
 162                        list_move(&spawn->list, &stack);
 163
 164                        if (&inst->alg == nalg)
 165                                break;
 166
 167                        spawn->alg = NULL;
 168                        spawns = &inst->alg.cra_users;
 169
 170                        /*
 171                         * We may encounter an unregistered instance here, since
 172                         * an instance's spawns are set up prior to the instance
 173                         * being registered.  An unregistered instance will have
 174                         * NULL ->cra_users.next, since ->cra_users isn't
 175                         * properly initialized until registration.  But an
 176                         * unregistered instance cannot have any users, so treat
 177                         * it the same as ->cra_users being empty.
 178                         */
 179                        if (spawns->next == NULL)
 180                                break;
 181                }
 182        } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 183                                              &secondary_spawns)));
 184
 185        list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 186                if (spawn->alg)
 187                        list_move(&spawn->list, &spawn->alg->cra_users);
 188                else
 189                        crypto_remove_instance(spawn->inst, list);
 190        }
 191}
 192EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 193
 194static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 195{
 196        struct crypto_alg *q;
 197        struct crypto_larval *larval;
 198        int ret = -EAGAIN;
 199
 200        if (crypto_is_dead(alg))
 201                goto err;
 202
 203        INIT_LIST_HEAD(&alg->cra_users);
 204
 205        /* No cheating! */
 206        alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 207
 208        ret = -EEXIST;
 209
 210        list_for_each_entry(q, &crypto_alg_list, cra_list) {
 211                if (q == alg)
 212                        goto err;
 213
 214                if (crypto_is_moribund(q))
 215                        continue;
 216
 217                if (crypto_is_larval(q)) {
 218                        if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 219                                goto err;
 220                        continue;
 221                }
 222
 223                if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 224                    !strcmp(q->cra_name, alg->cra_driver_name))
 225                        goto err;
 226        }
 227
 228        larval = crypto_larval_alloc(alg->cra_name,
 229                                     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 230        if (IS_ERR(larval))
 231                goto out;
 232
 233        ret = -ENOENT;
 234        larval->adult = crypto_mod_get(alg);
 235        if (!larval->adult)
 236                goto free_larval;
 237
 238        refcount_set(&larval->alg.cra_refcnt, 1);
 239        memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 240               CRYPTO_MAX_ALG_NAME);
 241        larval->alg.cra_priority = alg->cra_priority;
 242
 243        list_add(&alg->cra_list, &crypto_alg_list);
 244        list_add(&larval->alg.cra_list, &crypto_alg_list);
 245
 246out:
 247        return larval;
 248
 249free_larval:
 250        kfree(larval);
 251err:
 252        larval = ERR_PTR(ret);
 253        goto out;
 254}
 255
 256void crypto_alg_tested(const char *name, int err)
 257{
 258        struct crypto_larval *test;
 259        struct crypto_alg *alg;
 260        struct crypto_alg *q;
 261        LIST_HEAD(list);
 262
 263        down_write(&crypto_alg_sem);
 264        list_for_each_entry(q, &crypto_alg_list, cra_list) {
 265                if (crypto_is_moribund(q) || !crypto_is_larval(q))
 266                        continue;
 267
 268                test = (struct crypto_larval *)q;
 269
 270                if (!strcmp(q->cra_driver_name, name))
 271                        goto found;
 272        }
 273
 274        pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 275        goto unlock;
 276
 277found:
 278        q->cra_flags |= CRYPTO_ALG_DEAD;
 279        alg = test->adult;
 280        if (err || list_empty(&alg->cra_list))
 281                goto complete;
 282
 283        alg->cra_flags |= CRYPTO_ALG_TESTED;
 284
 285        list_for_each_entry(q, &crypto_alg_list, cra_list) {
 286                if (q == alg)
 287                        continue;
 288
 289                if (crypto_is_moribund(q))
 290                        continue;
 291
 292                if (crypto_is_larval(q)) {
 293                        struct crypto_larval *larval = (void *)q;
 294
 295                        /*
 296                         * Check to see if either our generic name or
 297                         * specific name can satisfy the name requested
 298                         * by the larval entry q.
 299                         */
 300                        if (strcmp(alg->cra_name, q->cra_name) &&
 301                            strcmp(alg->cra_driver_name, q->cra_name))
 302                                continue;
 303
 304                        if (larval->adult)
 305                                continue;
 306                        if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 307                                continue;
 308                        if (!crypto_mod_get(alg))
 309                                continue;
 310
 311                        larval->adult = alg;
 312                        continue;
 313                }
 314
 315                if (strcmp(alg->cra_name, q->cra_name))
 316                        continue;
 317
 318                if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 319                    q->cra_priority > alg->cra_priority)
 320                        continue;
 321
 322                crypto_remove_spawns(q, &list, alg);
 323        }
 324
 325complete:
 326        complete_all(&test->completion);
 327
 328unlock:
 329        up_write(&crypto_alg_sem);
 330
 331        crypto_remove_final(&list);
 332}
 333EXPORT_SYMBOL_GPL(crypto_alg_tested);
 334
 335void crypto_remove_final(struct list_head *list)
 336{
 337        struct crypto_alg *alg;
 338        struct crypto_alg *n;
 339
 340        list_for_each_entry_safe(alg, n, list, cra_list) {
 341                list_del_init(&alg->cra_list);
 342                crypto_alg_put(alg);
 343        }
 344}
 345EXPORT_SYMBOL_GPL(crypto_remove_final);
 346
 347static void crypto_wait_for_test(struct crypto_larval *larval)
 348{
 349        int err;
 350
 351        err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 352        if (err != NOTIFY_STOP) {
 353                if (WARN_ON(err != NOTIFY_DONE))
 354                        goto out;
 355                crypto_alg_tested(larval->alg.cra_driver_name, 0);
 356        }
 357
 358        err = wait_for_completion_killable(&larval->completion);
 359        WARN_ON(err);
 360
 361out:
 362        crypto_larval_kill(&larval->alg);
 363}
 364
 365int crypto_register_alg(struct crypto_alg *alg)
 366{
 367        struct crypto_larval *larval;
 368        int err;
 369
 370        alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 371        err = crypto_check_alg(alg);
 372        if (err)
 373                return err;
 374
 375        down_write(&crypto_alg_sem);
 376        larval = __crypto_register_alg(alg);
 377        up_write(&crypto_alg_sem);
 378
 379        if (IS_ERR(larval))
 380                return PTR_ERR(larval);
 381
 382        crypto_wait_for_test(larval);
 383        return 0;
 384}
 385EXPORT_SYMBOL_GPL(crypto_register_alg);
 386
 387static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 388{
 389        if (unlikely(list_empty(&alg->cra_list)))
 390                return -ENOENT;
 391
 392        alg->cra_flags |= CRYPTO_ALG_DEAD;
 393
 394        list_del_init(&alg->cra_list);
 395        crypto_remove_spawns(alg, list, NULL);
 396
 397        return 0;
 398}
 399
 400int crypto_unregister_alg(struct crypto_alg *alg)
 401{
 402        int ret;
 403        LIST_HEAD(list);
 404
 405        down_write(&crypto_alg_sem);
 406        ret = crypto_remove_alg(alg, &list);
 407        up_write(&crypto_alg_sem);
 408
 409        if (ret)
 410                return ret;
 411
 412        BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 413        if (alg->cra_destroy)
 414                alg->cra_destroy(alg);
 415
 416        crypto_remove_final(&list);
 417        return 0;
 418}
 419EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 420
 421int crypto_register_algs(struct crypto_alg *algs, int count)
 422{
 423        int i, ret;
 424
 425        for (i = 0; i < count; i++) {
 426                ret = crypto_register_alg(&algs[i]);
 427                if (ret)
 428                        goto err;
 429        }
 430
 431        return 0;
 432
 433err:
 434        for (--i; i >= 0; --i)
 435                crypto_unregister_alg(&algs[i]);
 436
 437        return ret;
 438}
 439EXPORT_SYMBOL_GPL(crypto_register_algs);
 440
 441int crypto_unregister_algs(struct crypto_alg *algs, int count)
 442{
 443        int i, ret;
 444
 445        for (i = 0; i < count; i++) {
 446                ret = crypto_unregister_alg(&algs[i]);
 447                if (ret)
 448                        pr_err("Failed to unregister %s %s: %d\n",
 449                               algs[i].cra_driver_name, algs[i].cra_name, ret);
 450        }
 451
 452        return 0;
 453}
 454EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 455
 456int crypto_register_template(struct crypto_template *tmpl)
 457{
 458        struct crypto_template *q;
 459        int err = -EEXIST;
 460
 461        down_write(&crypto_alg_sem);
 462
 463        crypto_check_module_sig(tmpl->module);
 464
 465        list_for_each_entry(q, &crypto_template_list, list) {
 466                if (q == tmpl)
 467                        goto out;
 468        }
 469
 470        list_add(&tmpl->list, &crypto_template_list);
 471        err = 0;
 472out:
 473        up_write(&crypto_alg_sem);
 474        return err;
 475}
 476EXPORT_SYMBOL_GPL(crypto_register_template);
 477
 478void crypto_unregister_template(struct crypto_template *tmpl)
 479{
 480        struct crypto_instance *inst;
 481        struct hlist_node *n;
 482        struct hlist_head *list;
 483        LIST_HEAD(users);
 484
 485        down_write(&crypto_alg_sem);
 486
 487        BUG_ON(list_empty(&tmpl->list));
 488        list_del_init(&tmpl->list);
 489
 490        list = &tmpl->instances;
 491        hlist_for_each_entry(inst, list, list) {
 492                int err = crypto_remove_alg(&inst->alg, &users);
 493
 494                BUG_ON(err);
 495        }
 496
 497        up_write(&crypto_alg_sem);
 498
 499        hlist_for_each_entry_safe(inst, n, list, list) {
 500                BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 501                crypto_free_instance(inst);
 502        }
 503        crypto_remove_final(&users);
 504}
 505EXPORT_SYMBOL_GPL(crypto_unregister_template);
 506
 507static struct crypto_template *__crypto_lookup_template(const char *name)
 508{
 509        struct crypto_template *q, *tmpl = NULL;
 510
 511        down_read(&crypto_alg_sem);
 512        list_for_each_entry(q, &crypto_template_list, list) {
 513                if (strcmp(q->name, name))
 514                        continue;
 515                if (unlikely(!crypto_tmpl_get(q)))
 516                        continue;
 517
 518                tmpl = q;
 519                break;
 520        }
 521        up_read(&crypto_alg_sem);
 522
 523        return tmpl;
 524}
 525
 526struct crypto_template *crypto_lookup_template(const char *name)
 527{
 528        return try_then_request_module(__crypto_lookup_template(name),
 529                                       "crypto-%s", name);
 530}
 531EXPORT_SYMBOL_GPL(crypto_lookup_template);
 532
 533int crypto_register_instance(struct crypto_template *tmpl,
 534                             struct crypto_instance *inst)
 535{
 536        struct crypto_larval *larval;
 537        int err;
 538
 539        err = crypto_check_alg(&inst->alg);
 540        if (err)
 541                return err;
 542
 543        inst->alg.cra_module = tmpl->module;
 544        inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 545
 546        if (unlikely(!crypto_mod_get(&inst->alg)))
 547                return -EAGAIN;
 548
 549        down_write(&crypto_alg_sem);
 550
 551        larval = __crypto_register_alg(&inst->alg);
 552        if (IS_ERR(larval))
 553                goto unlock;
 554
 555        hlist_add_head(&inst->list, &tmpl->instances);
 556        inst->tmpl = tmpl;
 557
 558unlock:
 559        up_write(&crypto_alg_sem);
 560
 561        err = PTR_ERR(larval);
 562        if (IS_ERR(larval))
 563                goto err;
 564
 565        crypto_wait_for_test(larval);
 566
 567        /* Remove instance if test failed */
 568        if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
 569                crypto_unregister_instance(inst);
 570        err = 0;
 571
 572err:
 573        crypto_mod_put(&inst->alg);
 574        return err;
 575}
 576EXPORT_SYMBOL_GPL(crypto_register_instance);
 577
 578int crypto_unregister_instance(struct crypto_instance *inst)
 579{
 580        LIST_HEAD(list);
 581
 582        down_write(&crypto_alg_sem);
 583
 584        crypto_remove_spawns(&inst->alg, &list, NULL);
 585        crypto_remove_instance(inst, &list);
 586
 587        up_write(&crypto_alg_sem);
 588
 589        crypto_remove_final(&list);
 590
 591        return 0;
 592}
 593EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 594
 595int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 596                      struct crypto_instance *inst, u32 mask)
 597{
 598        int err = -EAGAIN;
 599
 600        spawn->inst = inst;
 601        spawn->mask = mask;
 602
 603        down_write(&crypto_alg_sem);
 604        if (!crypto_is_moribund(alg)) {
 605                list_add(&spawn->list, &alg->cra_users);
 606                spawn->alg = alg;
 607                err = 0;
 608        }
 609        up_write(&crypto_alg_sem);
 610
 611        return err;
 612}
 613EXPORT_SYMBOL_GPL(crypto_init_spawn);
 614
 615int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 616                       struct crypto_instance *inst,
 617                       const struct crypto_type *frontend)
 618{
 619        int err = -EINVAL;
 620
 621        if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 622                goto out;
 623
 624        spawn->frontend = frontend;
 625        err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 626
 627out:
 628        return err;
 629}
 630EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 631
 632int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 633                      u32 type, u32 mask)
 634{
 635        struct crypto_alg *alg;
 636        int err;
 637
 638        alg = crypto_find_alg(name, spawn->frontend, type, mask);
 639        if (IS_ERR(alg))
 640                return PTR_ERR(alg);
 641
 642        err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 643        crypto_mod_put(alg);
 644        return err;
 645}
 646EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 647
 648void crypto_drop_spawn(struct crypto_spawn *spawn)
 649{
 650        if (!spawn->alg)
 651                return;
 652
 653        down_write(&crypto_alg_sem);
 654        list_del(&spawn->list);
 655        up_write(&crypto_alg_sem);
 656}
 657EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 658
 659static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 660{
 661        struct crypto_alg *alg;
 662        struct crypto_alg *alg2;
 663
 664        down_read(&crypto_alg_sem);
 665        alg = spawn->alg;
 666        alg2 = alg;
 667        if (alg2)
 668                alg2 = crypto_mod_get(alg2);
 669        up_read(&crypto_alg_sem);
 670
 671        if (!alg2) {
 672                if (alg)
 673                        crypto_shoot_alg(alg);
 674                return ERR_PTR(-EAGAIN);
 675        }
 676
 677        return alg;
 678}
 679
 680struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 681                                    u32 mask)
 682{
 683        struct crypto_alg *alg;
 684        struct crypto_tfm *tfm;
 685
 686        alg = crypto_spawn_alg(spawn);
 687        if (IS_ERR(alg))
 688                return ERR_CAST(alg);
 689
 690        tfm = ERR_PTR(-EINVAL);
 691        if (unlikely((alg->cra_flags ^ type) & mask))
 692                goto out_put_alg;
 693
 694        tfm = __crypto_alloc_tfm(alg, type, mask);
 695        if (IS_ERR(tfm))
 696                goto out_put_alg;
 697
 698        return tfm;
 699
 700out_put_alg:
 701        crypto_mod_put(alg);
 702        return tfm;
 703}
 704EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 705
 706void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 707{
 708        struct crypto_alg *alg;
 709        struct crypto_tfm *tfm;
 710
 711        alg = crypto_spawn_alg(spawn);
 712        if (IS_ERR(alg))
 713                return ERR_CAST(alg);
 714
 715        tfm = crypto_create_tfm(alg, spawn->frontend);
 716        if (IS_ERR(tfm))
 717                goto out_put_alg;
 718
 719        return tfm;
 720
 721out_put_alg:
 722        crypto_mod_put(alg);
 723        return tfm;
 724}
 725EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 726
 727int crypto_register_notifier(struct notifier_block *nb)
 728{
 729        return blocking_notifier_chain_register(&crypto_chain, nb);
 730}
 731EXPORT_SYMBOL_GPL(crypto_register_notifier);
 732
 733int crypto_unregister_notifier(struct notifier_block *nb)
 734{
 735        return blocking_notifier_chain_unregister(&crypto_chain, nb);
 736}
 737EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 738
 739struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 740{
 741        struct rtattr *rta = tb[0];
 742        struct crypto_attr_type *algt;
 743
 744        if (!rta)
 745                return ERR_PTR(-ENOENT);
 746        if (RTA_PAYLOAD(rta) < sizeof(*algt))
 747                return ERR_PTR(-EINVAL);
 748        if (rta->rta_type != CRYPTOA_TYPE)
 749                return ERR_PTR(-EINVAL);
 750
 751        algt = RTA_DATA(rta);
 752
 753        return algt;
 754}
 755EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 756
 757int crypto_check_attr_type(struct rtattr **tb, u32 type)
 758{
 759        struct crypto_attr_type *algt;
 760
 761        algt = crypto_get_attr_type(tb);
 762        if (IS_ERR(algt))
 763                return PTR_ERR(algt);
 764
 765        if ((algt->type ^ type) & algt->mask)
 766                return -EINVAL;
 767
 768        return 0;
 769}
 770EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 771
 772const char *crypto_attr_alg_name(struct rtattr *rta)
 773{
 774        struct crypto_attr_alg *alga;
 775
 776        if (!rta)
 777                return ERR_PTR(-ENOENT);
 778        if (RTA_PAYLOAD(rta) < sizeof(*alga))
 779                return ERR_PTR(-EINVAL);
 780        if (rta->rta_type != CRYPTOA_ALG)
 781                return ERR_PTR(-EINVAL);
 782
 783        alga = RTA_DATA(rta);
 784        alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 785
 786        return alga->name;
 787}
 788EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 789
 790struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 791                                    const struct crypto_type *frontend,
 792                                    u32 type, u32 mask)
 793{
 794        const char *name;
 795
 796        name = crypto_attr_alg_name(rta);
 797        if (IS_ERR(name))
 798                return ERR_CAST(name);
 799
 800        return crypto_find_alg(name, frontend, type, mask);
 801}
 802EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 803
 804int crypto_attr_u32(struct rtattr *rta, u32 *num)
 805{
 806        struct crypto_attr_u32 *nu32;
 807
 808        if (!rta)
 809                return -ENOENT;
 810        if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 811                return -EINVAL;
 812        if (rta->rta_type != CRYPTOA_U32)
 813                return -EINVAL;
 814
 815        nu32 = RTA_DATA(rta);
 816        *num = nu32->num;
 817
 818        return 0;
 819}
 820EXPORT_SYMBOL_GPL(crypto_attr_u32);
 821
 822int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 823                        struct crypto_alg *alg)
 824{
 825        if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 826                     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 827                return -ENAMETOOLONG;
 828
 829        if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 830                     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 831                return -ENAMETOOLONG;
 832
 833        return 0;
 834}
 835EXPORT_SYMBOL_GPL(crypto_inst_setname);
 836
 837void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 838                             unsigned int head)
 839{
 840        struct crypto_instance *inst;
 841        char *p;
 842        int err;
 843
 844        p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 845                    GFP_KERNEL);
 846        if (!p)
 847                return ERR_PTR(-ENOMEM);
 848
 849        inst = (void *)(p + head);
 850
 851        err = crypto_inst_setname(inst, name, alg);
 852        if (err)
 853                goto err_free_inst;
 854
 855        return p;
 856
 857err_free_inst:
 858        kfree(p);
 859        return ERR_PTR(err);
 860}
 861EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 862
 863struct crypto_instance *crypto_alloc_instance(const char *name,
 864                                              struct crypto_alg *alg)
 865{
 866        struct crypto_instance *inst;
 867        struct crypto_spawn *spawn;
 868        int err;
 869
 870        inst = crypto_alloc_instance2(name, alg, 0);
 871        if (IS_ERR(inst))
 872                goto out;
 873
 874        spawn = crypto_instance_ctx(inst);
 875        err = crypto_init_spawn(spawn, alg, inst,
 876                                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 877
 878        if (err)
 879                goto err_free_inst;
 880
 881        return inst;
 882
 883err_free_inst:
 884        kfree(inst);
 885        inst = ERR_PTR(err);
 886
 887out:
 888        return inst;
 889}
 890EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 891
 892void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 893{
 894        INIT_LIST_HEAD(&queue->list);
 895        queue->backlog = &queue->list;
 896        queue->qlen = 0;
 897        queue->max_qlen = max_qlen;
 898}
 899EXPORT_SYMBOL_GPL(crypto_init_queue);
 900
 901int crypto_enqueue_request(struct crypto_queue *queue,
 902                           struct crypto_async_request *request)
 903{
 904        int err = -EINPROGRESS;
 905
 906        if (unlikely(queue->qlen >= queue->max_qlen)) {
 907                if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 908                        err = -ENOSPC;
 909                        goto out;
 910                }
 911                err = -EBUSY;
 912                if (queue->backlog == &queue->list)
 913                        queue->backlog = &request->list;
 914        }
 915
 916        queue->qlen++;
 917        list_add_tail(&request->list, &queue->list);
 918
 919out:
 920        return err;
 921}
 922EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 923
 924struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 925{
 926        struct list_head *request;
 927
 928        if (unlikely(!queue->qlen))
 929                return NULL;
 930
 931        queue->qlen--;
 932
 933        if (queue->backlog != &queue->list)
 934                queue->backlog = queue->backlog->next;
 935
 936        request = queue->list.next;
 937        list_del(request);
 938
 939        return list_entry(request, struct crypto_async_request, list);
 940}
 941EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 942
 943int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 944{
 945        struct crypto_async_request *req;
 946
 947        list_for_each_entry(req, &queue->list, list) {
 948                if (req->tfm == tfm)
 949                        return 1;
 950        }
 951
 952        return 0;
 953}
 954EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 955
 956static inline void crypto_inc_byte(u8 *a, unsigned int size)
 957{
 958        u8 *b = (a + size);
 959        u8 c;
 960
 961        for (; size; size--) {
 962                c = *--b + 1;
 963                *b = c;
 964                if (c)
 965                        break;
 966        }
 967}
 968
 969void crypto_inc(u8 *a, unsigned int size)
 970{
 971        __be32 *b = (__be32 *)(a + size);
 972        u32 c;
 973
 974        if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 975            IS_ALIGNED((unsigned long)b, __alignof__(*b)))
 976                for (; size >= 4; size -= 4) {
 977                        c = be32_to_cpu(*--b) + 1;
 978                        *b = cpu_to_be32(c);
 979                        if (likely(c))
 980                                return;
 981                }
 982
 983        crypto_inc_byte(a, size);
 984}
 985EXPORT_SYMBOL_GPL(crypto_inc);
 986
 987void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
 988{
 989        int relalign = 0;
 990
 991        if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
 992                int size = sizeof(unsigned long);
 993                int d = (((unsigned long)dst ^ (unsigned long)src1) |
 994                         ((unsigned long)dst ^ (unsigned long)src2)) &
 995                        (size - 1);
 996
 997                relalign = d ? 1 << __ffs(d) : size;
 998
 999                /*
1000                 * If we care about alignment, process as many bytes as
1001                 * needed to advance dst and src to values whose alignments
1002                 * equal their relative alignment. This will allow us to
1003                 * process the remainder of the input using optimal strides.
1004                 */
1005                while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1006                        *dst++ = *src1++ ^ *src2++;
1007                        len--;
1008                }
1009        }
1010
1011        while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1012                *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1013                dst += 8;
1014                src1 += 8;
1015                src2 += 8;
1016                len -= 8;
1017        }
1018
1019        while (len >= 4 && !(relalign & 3)) {
1020                *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1021                dst += 4;
1022                src1 += 4;
1023                src2 += 4;
1024                len -= 4;
1025        }
1026
1027        while (len >= 2 && !(relalign & 1)) {
1028                *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1029                dst += 2;
1030                src1 += 2;
1031                src2 += 2;
1032                len -= 2;
1033        }
1034
1035        while (len--)
1036                *dst++ = *src1++ ^ *src2++;
1037}
1038EXPORT_SYMBOL_GPL(__crypto_xor);
1039
1040unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1041{
1042        return alg->cra_ctxsize +
1043               (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1044}
1045EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1046
1047int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1048                        u32 type, u32 mask)
1049{
1050        int ret = 0;
1051        struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1052
1053        if (!IS_ERR(alg)) {
1054                crypto_mod_put(alg);
1055                ret = 1;
1056        }
1057
1058        return ret;
1059}
1060EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1061
1062static int __init crypto_algapi_init(void)
1063{
1064        crypto_init_proc();
1065        return 0;
1066}
1067
1068static void __exit crypto_algapi_exit(void)
1069{
1070        crypto_exit_proc();
1071}
1072
1073module_init(crypto_algapi_init);
1074module_exit(crypto_algapi_exit);
1075
1076MODULE_LICENSE("GPL");
1077MODULE_DESCRIPTION("Cryptographic algorithms API");
1078