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/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
  25static LIST_HEAD(crypto_template_list);
  26
  27static 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
  44static 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
  58static 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
  67static 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
  90static 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
 114void 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}
 161EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 162
 163static 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
 216out:
 217        return larval;
 218
 219free_larval:
 220        kfree(larval);
 221err:
 222        larval = ERR_PTR(ret);
 223        goto out;
 224}
 225
 226void 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
 247found:
 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
 295complete:
 296        complete_all(&test->completion);
 297
 298unlock:
 299        up_write(&crypto_alg_sem);
 300
 301        crypto_remove_final(&list);
 302}
 303EXPORT_SYMBOL_GPL(crypto_alg_tested);
 304
 305void 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}
 315EXPORT_SYMBOL_GPL(crypto_remove_final);
 316
 317static 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
 331out:
 332        crypto_larval_kill(&larval->alg);
 333}
 334
 335int 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}
 354EXPORT_SYMBOL_GPL(crypto_register_alg);
 355
 356static 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
 370int 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}
 389EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 390
 391int 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
 403err:
 404        for (--i; i >= 0; --i)
 405                crypto_unregister_alg(&algs[i]);
 406
 407        return ret;
 408}
 409EXPORT_SYMBOL_GPL(crypto_register_algs);
 410
 411int 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}
 424EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 425
 426int 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;
 441out:
 442        up_write(&crypto_alg_sem);
 443        return err;
 444}
 445EXPORT_SYMBOL_GPL(crypto_register_template);
 446
 447void crypto_unregister_template(struct crypto_template *tmpl)
 448{
 449        struct crypto_instance *inst;
 450        struct hlist_node *p, *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, p, 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, p, n, list, list) {
 470                BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 471                tmpl->free(inst);
 472        }
 473        crypto_remove_final(&users);
 474}
 475EXPORT_SYMBOL_GPL(crypto_unregister_template);
 476
 477static 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
 496struct crypto_template *crypto_lookup_template(const char *name)
 497{
 498        return try_then_request_module(__crypto_lookup_template(name), name);
 499}
 500EXPORT_SYMBOL_GPL(crypto_lookup_template);
 501
 502int crypto_register_instance(struct crypto_template *tmpl,
 503                             struct crypto_instance *inst)
 504{
 505        struct crypto_larval *larval;
 506        int err;
 507
 508        err = crypto_check_alg(&inst->alg);
 509        if (err)
 510                goto err;
 511
 512        inst->alg.cra_module = tmpl->module;
 513        inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 514
 515        down_write(&crypto_alg_sem);
 516
 517        larval = __crypto_register_alg(&inst->alg);
 518        if (IS_ERR(larval))
 519                goto unlock;
 520
 521        hlist_add_head(&inst->list, &tmpl->instances);
 522        inst->tmpl = tmpl;
 523
 524unlock:
 525        up_write(&crypto_alg_sem);
 526
 527        err = PTR_ERR(larval);
 528        if (IS_ERR(larval))
 529                goto err;
 530
 531        crypto_wait_for_test(larval);
 532        err = 0;
 533
 534err:
 535        return err;
 536}
 537EXPORT_SYMBOL_GPL(crypto_register_instance);
 538
 539int crypto_unregister_instance(struct crypto_alg *alg)
 540{
 541        int err;
 542        struct crypto_instance *inst = (void *)alg;
 543        struct crypto_template *tmpl = inst->tmpl;
 544        LIST_HEAD(users);
 545
 546        if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
 547                return -EINVAL;
 548
 549        BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 550
 551        down_write(&crypto_alg_sem);
 552
 553        hlist_del_init(&inst->list);
 554        err = crypto_remove_alg(alg, &users);
 555
 556        up_write(&crypto_alg_sem);
 557
 558        if (err)
 559                return err;
 560
 561        tmpl->free(inst);
 562        crypto_remove_final(&users);
 563
 564        return 0;
 565}
 566EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 567
 568int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 569                      struct crypto_instance *inst, u32 mask)
 570{
 571        int err = -EAGAIN;
 572
 573        spawn->inst = inst;
 574        spawn->mask = mask;
 575
 576        down_write(&crypto_alg_sem);
 577        if (!crypto_is_moribund(alg)) {
 578                list_add(&spawn->list, &alg->cra_users);
 579                spawn->alg = alg;
 580                err = 0;
 581        }
 582        up_write(&crypto_alg_sem);
 583
 584        return err;
 585}
 586EXPORT_SYMBOL_GPL(crypto_init_spawn);
 587
 588int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 589                       struct crypto_instance *inst,
 590                       const struct crypto_type *frontend)
 591{
 592        int err = -EINVAL;
 593
 594        if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 595                goto out;
 596
 597        spawn->frontend = frontend;
 598        err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 599
 600out:
 601        return err;
 602}
 603EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 604
 605void crypto_drop_spawn(struct crypto_spawn *spawn)
 606{
 607        if (!spawn->alg)
 608                return;
 609
 610        down_write(&crypto_alg_sem);
 611        list_del(&spawn->list);
 612        up_write(&crypto_alg_sem);
 613}
 614EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 615
 616static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 617{
 618        struct crypto_alg *alg;
 619        struct crypto_alg *alg2;
 620
 621        down_read(&crypto_alg_sem);
 622        alg = spawn->alg;
 623        alg2 = alg;
 624        if (alg2)
 625                alg2 = crypto_mod_get(alg2);
 626        up_read(&crypto_alg_sem);
 627
 628        if (!alg2) {
 629                if (alg)
 630                        crypto_shoot_alg(alg);
 631                return ERR_PTR(-EAGAIN);
 632        }
 633
 634        return alg;
 635}
 636
 637struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 638                                    u32 mask)
 639{
 640        struct crypto_alg *alg;
 641        struct crypto_tfm *tfm;
 642
 643        alg = crypto_spawn_alg(spawn);
 644        if (IS_ERR(alg))
 645                return ERR_CAST(alg);
 646
 647        tfm = ERR_PTR(-EINVAL);
 648        if (unlikely((alg->cra_flags ^ type) & mask))
 649                goto out_put_alg;
 650
 651        tfm = __crypto_alloc_tfm(alg, type, mask);
 652        if (IS_ERR(tfm))
 653                goto out_put_alg;
 654
 655        return tfm;
 656
 657out_put_alg:
 658        crypto_mod_put(alg);
 659        return tfm;
 660}
 661EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 662
 663void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 664{
 665        struct crypto_alg *alg;
 666        struct crypto_tfm *tfm;
 667
 668        alg = crypto_spawn_alg(spawn);
 669        if (IS_ERR(alg))
 670                return ERR_CAST(alg);
 671
 672        tfm = crypto_create_tfm(alg, spawn->frontend);
 673        if (IS_ERR(tfm))
 674                goto out_put_alg;
 675
 676        return tfm;
 677
 678out_put_alg:
 679        crypto_mod_put(alg);
 680        return tfm;
 681}
 682EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 683
 684int crypto_register_notifier(struct notifier_block *nb)
 685{
 686        return blocking_notifier_chain_register(&crypto_chain, nb);
 687}
 688EXPORT_SYMBOL_GPL(crypto_register_notifier);
 689
 690int crypto_unregister_notifier(struct notifier_block *nb)
 691{
 692        return blocking_notifier_chain_unregister(&crypto_chain, nb);
 693}
 694EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 695
 696struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 697{
 698        struct rtattr *rta = tb[0];
 699        struct crypto_attr_type *algt;
 700
 701        if (!rta)
 702                return ERR_PTR(-ENOENT);
 703        if (RTA_PAYLOAD(rta) < sizeof(*algt))
 704                return ERR_PTR(-EINVAL);
 705        if (rta->rta_type != CRYPTOA_TYPE)
 706                return ERR_PTR(-EINVAL);
 707
 708        algt = RTA_DATA(rta);
 709
 710        return algt;
 711}
 712EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 713
 714int crypto_check_attr_type(struct rtattr **tb, u32 type)
 715{
 716        struct crypto_attr_type *algt;
 717
 718        algt = crypto_get_attr_type(tb);
 719        if (IS_ERR(algt))
 720                return PTR_ERR(algt);
 721
 722        if ((algt->type ^ type) & algt->mask)
 723                return -EINVAL;
 724
 725        return 0;
 726}
 727EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 728
 729const char *crypto_attr_alg_name(struct rtattr *rta)
 730{
 731        struct crypto_attr_alg *alga;
 732
 733        if (!rta)
 734                return ERR_PTR(-ENOENT);
 735        if (RTA_PAYLOAD(rta) < sizeof(*alga))
 736                return ERR_PTR(-EINVAL);
 737        if (rta->rta_type != CRYPTOA_ALG)
 738                return ERR_PTR(-EINVAL);
 739
 740        alga = RTA_DATA(rta);
 741        alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 742
 743        return alga->name;
 744}
 745EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 746
 747struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 748                                    const struct crypto_type *frontend,
 749                                    u32 type, u32 mask)
 750{
 751        const char *name;
 752        int err;
 753
 754        name = crypto_attr_alg_name(rta);
 755        err = PTR_ERR(name);
 756        if (IS_ERR(name))
 757                return ERR_PTR(err);
 758
 759        return crypto_find_alg(name, frontend, type, mask);
 760}
 761EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 762
 763int crypto_attr_u32(struct rtattr *rta, u32 *num)
 764{
 765        struct crypto_attr_u32 *nu32;
 766
 767        if (!rta)
 768                return -ENOENT;
 769        if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 770                return -EINVAL;
 771        if (rta->rta_type != CRYPTOA_U32)
 772                return -EINVAL;
 773
 774        nu32 = RTA_DATA(rta);
 775        *num = nu32->num;
 776
 777        return 0;
 778}
 779EXPORT_SYMBOL_GPL(crypto_attr_u32);
 780
 781void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 782                             unsigned int head)
 783{
 784        struct crypto_instance *inst;
 785        char *p;
 786        int err;
 787
 788        p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 789                    GFP_KERNEL);
 790        if (!p)
 791                return ERR_PTR(-ENOMEM);
 792
 793        inst = (void *)(p + head);
 794
 795        err = -ENAMETOOLONG;
 796        if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 797                     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 798                goto err_free_inst;
 799
 800        if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 801                     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 802                goto err_free_inst;
 803
 804        return p;
 805
 806err_free_inst:
 807        kfree(p);
 808        return ERR_PTR(err);
 809}
 810EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 811
 812struct crypto_instance *crypto_alloc_instance(const char *name,
 813                                              struct crypto_alg *alg)
 814{
 815        struct crypto_instance *inst;
 816        struct crypto_spawn *spawn;
 817        int err;
 818
 819        inst = crypto_alloc_instance2(name, alg, 0);
 820        if (IS_ERR(inst))
 821                goto out;
 822
 823        spawn = crypto_instance_ctx(inst);
 824        err = crypto_init_spawn(spawn, alg, inst,
 825                                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 826
 827        if (err)
 828                goto err_free_inst;
 829
 830        return inst;
 831
 832err_free_inst:
 833        kfree(inst);
 834        inst = ERR_PTR(err);
 835
 836out:
 837        return inst;
 838}
 839EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 840
 841void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 842{
 843        INIT_LIST_HEAD(&queue->list);
 844        queue->backlog = &queue->list;
 845        queue->qlen = 0;
 846        queue->max_qlen = max_qlen;
 847}
 848EXPORT_SYMBOL_GPL(crypto_init_queue);
 849
 850int crypto_enqueue_request(struct crypto_queue *queue,
 851                           struct crypto_async_request *request)
 852{
 853        int err = -EINPROGRESS;
 854
 855        if (unlikely(queue->qlen >= queue->max_qlen)) {
 856                err = -EBUSY;
 857                if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 858                        goto out;
 859                if (queue->backlog == &queue->list)
 860                        queue->backlog = &request->list;
 861        }
 862
 863        queue->qlen++;
 864        list_add_tail(&request->list, &queue->list);
 865
 866out:
 867        return err;
 868}
 869EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 870
 871void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 872{
 873        struct list_head *request;
 874
 875        if (unlikely(!queue->qlen))
 876                return NULL;
 877
 878        queue->qlen--;
 879
 880        if (queue->backlog != &queue->list)
 881                queue->backlog = queue->backlog->next;
 882
 883        request = queue->list.next;
 884        list_del(request);
 885
 886        return (char *)list_entry(request, struct crypto_async_request, list) -
 887               offset;
 888}
 889EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 890
 891struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 892{
 893        return __crypto_dequeue_request(queue, 0);
 894}
 895EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 896
 897int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 898{
 899        struct crypto_async_request *req;
 900
 901        list_for_each_entry(req, &queue->list, list) {
 902                if (req->tfm == tfm)
 903                        return 1;
 904        }
 905
 906        return 0;
 907}
 908EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 909
 910static inline void crypto_inc_byte(u8 *a, unsigned int size)
 911{
 912        u8 *b = (a + size);
 913        u8 c;
 914
 915        for (; size; size--) {
 916                c = *--b + 1;
 917                *b = c;
 918                if (c)
 919                        break;
 920        }
 921}
 922
 923void crypto_inc(u8 *a, unsigned int size)
 924{
 925        __be32 *b = (__be32 *)(a + size);
 926        u32 c;
 927
 928        for (; size >= 4; size -= 4) {
 929                c = be32_to_cpu(*--b) + 1;
 930                *b = cpu_to_be32(c);
 931                if (c)
 932                        return;
 933        }
 934
 935        crypto_inc_byte(a, size);
 936}
 937EXPORT_SYMBOL_GPL(crypto_inc);
 938
 939static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 940{
 941        for (; size; size--)
 942                *a++ ^= *b++;
 943}
 944
 945void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 946{
 947        u32 *a = (u32 *)dst;
 948        u32 *b = (u32 *)src;
 949
 950        for (; size >= 4; size -= 4)
 951                *a++ ^= *b++;
 952
 953        crypto_xor_byte((u8 *)a, (u8 *)b, size);
 954}
 955EXPORT_SYMBOL_GPL(crypto_xor);
 956
 957static int __init crypto_algapi_init(void)
 958{
 959        crypto_init_proc();
 960        return 0;
 961}
 962
 963static void __exit crypto_algapi_exit(void)
 964{
 965        crypto_exit_proc();
 966}
 967
 968module_init(crypto_algapi_init);
 969module_exit(crypto_algapi_exit);
 970
 971MODULE_LICENSE("GPL");
 972MODULE_DESCRIPTION("Cryptographic algorithms API");
 973
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