linux/crypto/algapi.c
<<
>>
Prefs
   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
  27void crypto_larval_error(const char *name, u32 type, u32 mask)
  28{
  29        struct crypto_alg *alg;
  30
  31        alg = crypto_alg_lookup(name, type, mask);
  32
  33        if (alg) {
  34                if (crypto_is_larval(alg)) {
  35                        struct crypto_larval *larval = (void *)alg;
  36                        complete_all(&larval->completion);
  37                }
  38                crypto_mod_put(alg);
  39        }
  40}
  41EXPORT_SYMBOL_GPL(crypto_larval_error);
  42
  43static inline int crypto_set_driver_name(struct crypto_alg *alg)
  44{
  45        static const char suffix[] = "-generic";
  46        char *driver_name = alg->cra_driver_name;
  47        int len;
  48
  49        if (*driver_name)
  50                return 0;
  51
  52        len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  53        if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  54                return -ENAMETOOLONG;
  55
  56        memcpy(driver_name + len, suffix, sizeof(suffix));
  57        return 0;
  58}
  59
  60static int crypto_check_alg(struct crypto_alg *alg)
  61{
  62        if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  63                return -EINVAL;
  64
  65        if (alg->cra_blocksize > PAGE_SIZE / 8)
  66                return -EINVAL;
  67
  68        if (alg->cra_priority < 0)
  69                return -EINVAL;
  70
  71        return crypto_set_driver_name(alg);
  72}
  73
  74static void crypto_destroy_instance(struct crypto_alg *alg)
  75{
  76        struct crypto_instance *inst = (void *)alg;
  77        struct crypto_template *tmpl = inst->tmpl;
  78
  79        tmpl->free(inst);
  80        crypto_tmpl_put(tmpl);
  81}
  82
  83static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  84                                            struct list_head *stack,
  85                                            struct list_head *top,
  86                                            struct list_head *secondary_spawns)
  87{
  88        struct crypto_spawn *spawn, *n;
  89
  90        if (list_empty(stack))
  91                return NULL;
  92
  93        spawn = list_first_entry(stack, struct crypto_spawn, list);
  94        n = list_entry(spawn->list.next, struct crypto_spawn, list);
  95
  96        if (spawn->alg && &n->list != stack && !n->alg)
  97                n->alg = (n->list.next == stack) ? alg :
  98                         &list_entry(n->list.next, struct crypto_spawn,
  99                                     list)->inst->alg;
 100
 101        list_move(&spawn->list, secondary_spawns);
 102
 103        return &n->list == stack ? top : &n->inst->alg.cra_users;
 104}
 105
 106static void crypto_remove_spawn(struct crypto_spawn *spawn,
 107                                struct list_head *list)
 108{
 109        struct crypto_instance *inst = spawn->inst;
 110        struct crypto_template *tmpl = inst->tmpl;
 111
 112        if (crypto_is_dead(&inst->alg))
 113                return;
 114
 115        inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 116        if (hlist_unhashed(&inst->list))
 117                return;
 118
 119        if (!tmpl || !crypto_tmpl_get(tmpl))
 120                return;
 121
 122        crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 123        list_move(&inst->alg.cra_list, list);
 124        hlist_del(&inst->list);
 125        inst->alg.cra_destroy = crypto_destroy_instance;
 126
 127        BUG_ON(!list_empty(&inst->alg.cra_users));
 128}
 129
 130void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 131                          struct crypto_alg *nalg)
 132{
 133        u32 new_type = (nalg ?: alg)->cra_flags;
 134        struct crypto_spawn *spawn, *n;
 135        LIST_HEAD(secondary_spawns);
 136        struct list_head *spawns;
 137        LIST_HEAD(stack);
 138        LIST_HEAD(top);
 139
 140        spawns = &alg->cra_users;
 141        list_for_each_entry_safe(spawn, n, spawns, list) {
 142                if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 143                        continue;
 144
 145                list_move(&spawn->list, &top);
 146        }
 147
 148        spawns = &top;
 149        do {
 150                while (!list_empty(spawns)) {
 151                        struct crypto_instance *inst;
 152
 153                        spawn = list_first_entry(spawns, struct crypto_spawn,
 154                                                 list);
 155                        inst = spawn->inst;
 156
 157                        BUG_ON(&inst->alg == alg);
 158
 159                        list_move(&spawn->list, &stack);
 160
 161                        if (&inst->alg == nalg)
 162                                break;
 163
 164                        spawn->alg = NULL;
 165                        spawns = &inst->alg.cra_users;
 166                }
 167        } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 168                                              &secondary_spawns)));
 169
 170        list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 171                if (spawn->alg)
 172                        list_move(&spawn->list, &spawn->alg->cra_users);
 173                else
 174                        crypto_remove_spawn(spawn, list);
 175        }
 176}
 177EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 178
 179static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 180{
 181        struct crypto_alg *q;
 182        struct crypto_larval *larval;
 183        int ret = -EAGAIN;
 184
 185        if (crypto_is_dead(alg))
 186                goto err;
 187
 188        INIT_LIST_HEAD(&alg->cra_users);
 189
 190        /* No cheating! */
 191        alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 192
 193        ret = -EEXIST;
 194
 195        atomic_set(&alg->cra_refcnt, 1);
 196        list_for_each_entry(q, &crypto_alg_list, cra_list) {
 197                if (q == alg)
 198                        goto err;
 199
 200                if (crypto_is_moribund(q))
 201                        continue;
 202
 203                if (crypto_is_larval(q)) {
 204                        if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 205                                goto err;
 206                        continue;
 207                }
 208
 209                if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 210                    !strcmp(q->cra_name, alg->cra_driver_name))
 211                        goto err;
 212        }
 213
 214        larval = crypto_larval_alloc(alg->cra_name,
 215                                     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 216        if (IS_ERR(larval))
 217                goto out;
 218
 219        ret = -ENOENT;
 220        larval->adult = crypto_mod_get(alg);
 221        if (!larval->adult)
 222                goto free_larval;
 223
 224        atomic_set(&larval->alg.cra_refcnt, 1);
 225        memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 226               CRYPTO_MAX_ALG_NAME);
 227        larval->alg.cra_priority = alg->cra_priority;
 228
 229        list_add(&alg->cra_list, &crypto_alg_list);
 230        list_add(&larval->alg.cra_list, &crypto_alg_list);
 231
 232out:
 233        return larval;
 234
 235free_larval:
 236        kfree(larval);
 237err:
 238        larval = ERR_PTR(ret);
 239        goto out;
 240}
 241
 242void crypto_alg_tested(const char *name, int err)
 243{
 244        struct crypto_larval *test;
 245        struct crypto_alg *alg;
 246        struct crypto_alg *q;
 247        LIST_HEAD(list);
 248
 249        down_write(&crypto_alg_sem);
 250        list_for_each_entry(q, &crypto_alg_list, cra_list) {
 251                if (crypto_is_moribund(q) || !crypto_is_larval(q))
 252                        continue;
 253
 254                test = (struct crypto_larval *)q;
 255
 256                if (!strcmp(q->cra_driver_name, name))
 257                        goto found;
 258        }
 259
 260        printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 261        goto unlock;
 262
 263found:
 264        q->cra_flags |= CRYPTO_ALG_DEAD;
 265        alg = test->adult;
 266        if (err || list_empty(&alg->cra_list))
 267                goto complete;
 268
 269        alg->cra_flags |= CRYPTO_ALG_TESTED;
 270
 271        list_for_each_entry(q, &crypto_alg_list, cra_list) {
 272                if (q == alg)
 273                        continue;
 274
 275                if (crypto_is_moribund(q))
 276                        continue;
 277
 278                if (crypto_is_larval(q)) {
 279                        struct crypto_larval *larval = (void *)q;
 280
 281                        /*
 282                         * Check to see if either our generic name or
 283                         * specific name can satisfy the name requested
 284                         * by the larval entry q.
 285                         */
 286                        if (strcmp(alg->cra_name, q->cra_name) &&
 287                            strcmp(alg->cra_driver_name, q->cra_name))
 288                                continue;
 289
 290                        if (larval->adult)
 291                                continue;
 292                        if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 293                                continue;
 294                        if (!crypto_mod_get(alg))
 295                                continue;
 296
 297                        larval->adult = alg;
 298                        complete_all(&larval->completion);
 299                        continue;
 300                }
 301
 302                if (strcmp(alg->cra_name, q->cra_name))
 303                        continue;
 304
 305                if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 306                    q->cra_priority > alg->cra_priority)
 307                        continue;
 308
 309                crypto_remove_spawns(q, &list, alg);
 310        }
 311
 312complete:
 313        complete_all(&test->completion);
 314
 315unlock:
 316        up_write(&crypto_alg_sem);
 317
 318        crypto_remove_final(&list);
 319}
 320EXPORT_SYMBOL_GPL(crypto_alg_tested);
 321
 322void crypto_remove_final(struct list_head *list)
 323{
 324        struct crypto_alg *alg;
 325        struct crypto_alg *n;
 326
 327        list_for_each_entry_safe(alg, n, list, cra_list) {
 328                list_del_init(&alg->cra_list);
 329                crypto_alg_put(alg);
 330        }
 331}
 332EXPORT_SYMBOL_GPL(crypto_remove_final);
 333
 334static void crypto_wait_for_test(struct crypto_larval *larval)
 335{
 336        int err;
 337
 338        err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 339        if (err != NOTIFY_STOP) {
 340                if (WARN_ON(err != NOTIFY_DONE))
 341                        goto out;
 342                crypto_alg_tested(larval->alg.cra_driver_name, 0);
 343        }
 344
 345        err = wait_for_completion_interruptible(&larval->completion);
 346        WARN_ON(err);
 347
 348out:
 349        crypto_larval_kill(&larval->alg);
 350}
 351
 352int crypto_register_alg(struct crypto_alg *alg)
 353{
 354        struct crypto_larval *larval;
 355        int err;
 356
 357        err = crypto_check_alg(alg);
 358        if (err)
 359                return err;
 360
 361        down_write(&crypto_alg_sem);
 362        larval = __crypto_register_alg(alg);
 363        up_write(&crypto_alg_sem);
 364
 365        if (IS_ERR(larval))
 366                return PTR_ERR(larval);
 367
 368        crypto_wait_for_test(larval);
 369        return 0;
 370}
 371EXPORT_SYMBOL_GPL(crypto_register_alg);
 372
 373static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 374{
 375        if (unlikely(list_empty(&alg->cra_list)))
 376                return -ENOENT;
 377
 378        alg->cra_flags |= CRYPTO_ALG_DEAD;
 379
 380        crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 381        list_del_init(&alg->cra_list);
 382        crypto_remove_spawns(alg, list, NULL);
 383
 384        return 0;
 385}
 386
 387int crypto_unregister_alg(struct crypto_alg *alg)
 388{
 389        int ret;
 390        LIST_HEAD(list);
 391
 392        down_write(&crypto_alg_sem);
 393        ret = crypto_remove_alg(alg, &list);
 394        up_write(&crypto_alg_sem);
 395
 396        if (ret)
 397                return ret;
 398
 399        BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 400        if (alg->cra_destroy)
 401                alg->cra_destroy(alg);
 402
 403        crypto_remove_final(&list);
 404        return 0;
 405}
 406EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 407
 408int crypto_register_algs(struct crypto_alg *algs, int count)
 409{
 410        int i, ret;
 411
 412        for (i = 0; i < count; i++) {
 413                ret = crypto_register_alg(&algs[i]);
 414                if (ret)
 415                        goto err;
 416        }
 417
 418        return 0;
 419
 420err:
 421        for (--i; i >= 0; --i)
 422                crypto_unregister_alg(&algs[i]);
 423
 424        return ret;
 425}
 426EXPORT_SYMBOL_GPL(crypto_register_algs);
 427
 428int crypto_unregister_algs(struct crypto_alg *algs, int count)
 429{
 430        int i, ret;
 431
 432        for (i = 0; i < count; i++) {
 433                ret = crypto_unregister_alg(&algs[i]);
 434                if (ret)
 435                        pr_err("Failed to unregister %s %s: %d\n",
 436                               algs[i].cra_driver_name, algs[i].cra_name, ret);
 437        }
 438
 439        return 0;
 440}
 441EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 442
 443int crypto_register_template(struct crypto_template *tmpl)
 444{
 445        struct crypto_template *q;
 446        int err = -EEXIST;
 447
 448        down_write(&crypto_alg_sem);
 449
 450        list_for_each_entry(q, &crypto_template_list, list) {
 451                if (q == tmpl)
 452                        goto out;
 453        }
 454
 455        list_add(&tmpl->list, &crypto_template_list);
 456        crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 457        err = 0;
 458out:
 459        up_write(&crypto_alg_sem);
 460        return err;
 461}
 462EXPORT_SYMBOL_GPL(crypto_register_template);
 463
 464void crypto_unregister_template(struct crypto_template *tmpl)
 465{
 466        struct crypto_instance *inst;
 467        struct hlist_node *p, *n;
 468        struct hlist_head *list;
 469        LIST_HEAD(users);
 470
 471        down_write(&crypto_alg_sem);
 472
 473        BUG_ON(list_empty(&tmpl->list));
 474        list_del_init(&tmpl->list);
 475
 476        list = &tmpl->instances;
 477        hlist_for_each_entry(inst, p, list, list) {
 478                int err = crypto_remove_alg(&inst->alg, &users);
 479                BUG_ON(err);
 480        }
 481
 482        crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 483
 484        up_write(&crypto_alg_sem);
 485
 486        hlist_for_each_entry_safe(inst, p, n, list, list) {
 487                BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 488                tmpl->free(inst);
 489        }
 490        crypto_remove_final(&users);
 491}
 492EXPORT_SYMBOL_GPL(crypto_unregister_template);
 493
 494static struct crypto_template *__crypto_lookup_template(const char *name)
 495{
 496        struct crypto_template *q, *tmpl = NULL;
 497
 498        down_read(&crypto_alg_sem);
 499        list_for_each_entry(q, &crypto_template_list, list) {
 500                if (strcmp(q->name, name))
 501                        continue;
 502                if (unlikely(!crypto_tmpl_get(q)))
 503                        continue;
 504
 505                tmpl = q;
 506                break;
 507        }
 508        up_read(&crypto_alg_sem);
 509
 510        return tmpl;
 511}
 512
 513struct crypto_template *crypto_lookup_template(const char *name)
 514{
 515        return try_then_request_module(__crypto_lookup_template(name), name);
 516}
 517EXPORT_SYMBOL_GPL(crypto_lookup_template);
 518
 519int crypto_register_instance(struct crypto_template *tmpl,
 520                             struct crypto_instance *inst)
 521{
 522        struct crypto_larval *larval;
 523        int err;
 524
 525        err = crypto_check_alg(&inst->alg);
 526        if (err)
 527                goto err;
 528
 529        inst->alg.cra_module = tmpl->module;
 530        inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 531
 532        down_write(&crypto_alg_sem);
 533
 534        larval = __crypto_register_alg(&inst->alg);
 535        if (IS_ERR(larval))
 536                goto unlock;
 537
 538        hlist_add_head(&inst->list, &tmpl->instances);
 539        inst->tmpl = tmpl;
 540
 541unlock:
 542        up_write(&crypto_alg_sem);
 543
 544        err = PTR_ERR(larval);
 545        if (IS_ERR(larval))
 546                goto err;
 547
 548        crypto_wait_for_test(larval);
 549        err = 0;
 550
 551err:
 552        return err;
 553}
 554EXPORT_SYMBOL_GPL(crypto_register_instance);
 555
 556int crypto_unregister_instance(struct crypto_alg *alg)
 557{
 558        int err;
 559        struct crypto_instance *inst = (void *)alg;
 560        struct crypto_template *tmpl = inst->tmpl;
 561        LIST_HEAD(users);
 562
 563        if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
 564                return -EINVAL;
 565
 566        BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 567
 568        down_write(&crypto_alg_sem);
 569
 570        hlist_del_init(&inst->list);
 571        err = crypto_remove_alg(alg, &users);
 572
 573        up_write(&crypto_alg_sem);
 574
 575        if (err)
 576                return err;
 577
 578        tmpl->free(inst);
 579        crypto_remove_final(&users);
 580
 581        return 0;
 582}
 583EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 584
 585int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 586                      struct crypto_instance *inst, u32 mask)
 587{
 588        int err = -EAGAIN;
 589
 590        spawn->inst = inst;
 591        spawn->mask = mask;
 592
 593        down_write(&crypto_alg_sem);
 594        if (!crypto_is_moribund(alg)) {
 595                list_add(&spawn->list, &alg->cra_users);
 596                spawn->alg = alg;
 597                err = 0;
 598        }
 599        up_write(&crypto_alg_sem);
 600
 601        return err;
 602}
 603EXPORT_SYMBOL_GPL(crypto_init_spawn);
 604
 605int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 606                       struct crypto_instance *inst,
 607                       const struct crypto_type *frontend)
 608{
 609        int err = -EINVAL;
 610
 611        if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 612                goto out;
 613
 614        spawn->frontend = frontend;
 615        err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 616
 617out:
 618        return err;
 619}
 620EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 621
 622void crypto_drop_spawn(struct crypto_spawn *spawn)
 623{
 624        if (!spawn->alg)
 625                return;
 626
 627        down_write(&crypto_alg_sem);
 628        list_del(&spawn->list);
 629        up_write(&crypto_alg_sem);
 630}
 631EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 632
 633static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 634{
 635        struct crypto_alg *alg;
 636        struct crypto_alg *alg2;
 637
 638        down_read(&crypto_alg_sem);
 639        alg = spawn->alg;
 640        alg2 = alg;
 641        if (alg2)
 642                alg2 = crypto_mod_get(alg2);
 643        up_read(&crypto_alg_sem);
 644
 645        if (!alg2) {
 646                if (alg)
 647                        crypto_shoot_alg(alg);
 648                return ERR_PTR(-EAGAIN);
 649        }
 650
 651        return alg;
 652}
 653
 654struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 655                                    u32 mask)
 656{
 657        struct crypto_alg *alg;
 658        struct crypto_tfm *tfm;
 659
 660        alg = crypto_spawn_alg(spawn);
 661        if (IS_ERR(alg))
 662                return ERR_CAST(alg);
 663
 664        tfm = ERR_PTR(-EINVAL);
 665        if (unlikely((alg->cra_flags ^ type) & mask))
 666                goto out_put_alg;
 667
 668        tfm = __crypto_alloc_tfm(alg, type, mask);
 669        if (IS_ERR(tfm))
 670                goto out_put_alg;
 671
 672        return tfm;
 673
 674out_put_alg:
 675        crypto_mod_put(alg);
 676        return tfm;
 677}
 678EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 679
 680void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 681{
 682        struct crypto_alg *alg;
 683        struct crypto_tfm *tfm;
 684
 685        alg = crypto_spawn_alg(spawn);
 686        if (IS_ERR(alg))
 687                return ERR_CAST(alg);
 688
 689        tfm = crypto_create_tfm(alg, spawn->frontend);
 690        if (IS_ERR(tfm))
 691                goto out_put_alg;
 692
 693        return tfm;
 694
 695out_put_alg:
 696        crypto_mod_put(alg);
 697        return tfm;
 698}
 699EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 700
 701int crypto_register_notifier(struct notifier_block *nb)
 702{
 703        return blocking_notifier_chain_register(&crypto_chain, nb);
 704}
 705EXPORT_SYMBOL_GPL(crypto_register_notifier);
 706
 707int crypto_unregister_notifier(struct notifier_block *nb)
 708{
 709        return blocking_notifier_chain_unregister(&crypto_chain, nb);
 710}
 711EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 712
 713struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 714{
 715        struct rtattr *rta = tb[0];
 716        struct crypto_attr_type *algt;
 717
 718        if (!rta)
 719                return ERR_PTR(-ENOENT);
 720        if (RTA_PAYLOAD(rta) < sizeof(*algt))
 721                return ERR_PTR(-EINVAL);
 722        if (rta->rta_type != CRYPTOA_TYPE)
 723                return ERR_PTR(-EINVAL);
 724
 725        algt = RTA_DATA(rta);
 726
 727        return algt;
 728}
 729EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 730
 731int crypto_check_attr_type(struct rtattr **tb, u32 type)
 732{
 733        struct crypto_attr_type *algt;
 734
 735        algt = crypto_get_attr_type(tb);
 736        if (IS_ERR(algt))
 737                return PTR_ERR(algt);
 738
 739        if ((algt->type ^ type) & algt->mask)
 740                return -EINVAL;
 741
 742        return 0;
 743}
 744EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 745
 746const char *crypto_attr_alg_name(struct rtattr *rta)
 747{
 748        struct crypto_attr_alg *alga;
 749
 750        if (!rta)
 751                return ERR_PTR(-ENOENT);
 752        if (RTA_PAYLOAD(rta) < sizeof(*alga))
 753                return ERR_PTR(-EINVAL);
 754        if (rta->rta_type != CRYPTOA_ALG)
 755                return ERR_PTR(-EINVAL);
 756
 757        alga = RTA_DATA(rta);
 758        alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 759
 760        return alga->name;
 761}
 762EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 763
 764struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 765                                    const struct crypto_type *frontend,
 766                                    u32 type, u32 mask)
 767{
 768        const char *name;
 769        int err;
 770
 771        name = crypto_attr_alg_name(rta);
 772        err = PTR_ERR(name);
 773        if (IS_ERR(name))
 774                return ERR_PTR(err);
 775
 776        return crypto_find_alg(name, frontend, type, mask);
 777}
 778EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 779
 780int crypto_attr_u32(struct rtattr *rta, u32 *num)
 781{
 782        struct crypto_attr_u32 *nu32;
 783
 784        if (!rta)
 785                return -ENOENT;
 786        if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 787                return -EINVAL;
 788        if (rta->rta_type != CRYPTOA_U32)
 789                return -EINVAL;
 790
 791        nu32 = RTA_DATA(rta);
 792        *num = nu32->num;
 793
 794        return 0;
 795}
 796EXPORT_SYMBOL_GPL(crypto_attr_u32);
 797
 798void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 799                             unsigned int head)
 800{
 801        struct crypto_instance *inst;
 802        char *p;
 803        int err;
 804
 805        p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 806                    GFP_KERNEL);
 807        if (!p)
 808                return ERR_PTR(-ENOMEM);
 809
 810        inst = (void *)(p + head);
 811
 812        err = -ENAMETOOLONG;
 813        if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 814                     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 815                goto err_free_inst;
 816
 817        if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 818                     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 819                goto err_free_inst;
 820
 821        return p;
 822
 823err_free_inst:
 824        kfree(p);
 825        return ERR_PTR(err);
 826}
 827EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 828
 829struct crypto_instance *crypto_alloc_instance(const char *name,
 830                                              struct crypto_alg *alg)
 831{
 832        struct crypto_instance *inst;
 833        struct crypto_spawn *spawn;
 834        int err;
 835
 836        inst = crypto_alloc_instance2(name, alg, 0);
 837        if (IS_ERR(inst))
 838                goto out;
 839
 840        spawn = crypto_instance_ctx(inst);
 841        err = crypto_init_spawn(spawn, alg, inst,
 842                                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 843
 844        if (err)
 845                goto err_free_inst;
 846
 847        return inst;
 848
 849err_free_inst:
 850        kfree(inst);
 851        inst = ERR_PTR(err);
 852
 853out:
 854        return inst;
 855}
 856EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 857
 858void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 859{
 860        INIT_LIST_HEAD(&queue->list);
 861        queue->backlog = &queue->list;
 862        queue->qlen = 0;
 863        queue->max_qlen = max_qlen;
 864}
 865EXPORT_SYMBOL_GPL(crypto_init_queue);
 866
 867int crypto_enqueue_request(struct crypto_queue *queue,
 868                           struct crypto_async_request *request)
 869{
 870        int err = -EINPROGRESS;
 871
 872        if (unlikely(queue->qlen >= queue->max_qlen)) {
 873                err = -EBUSY;
 874                if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 875                        goto out;
 876                if (queue->backlog == &queue->list)
 877                        queue->backlog = &request->list;
 878        }
 879
 880        queue->qlen++;
 881        list_add_tail(&request->list, &queue->list);
 882
 883out:
 884        return err;
 885}
 886EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 887
 888void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 889{
 890        struct list_head *request;
 891
 892        if (unlikely(!queue->qlen))
 893                return NULL;
 894
 895        queue->qlen--;
 896
 897        if (queue->backlog != &queue->list)
 898                queue->backlog = queue->backlog->next;
 899
 900        request = queue->list.next;
 901        list_del(request);
 902
 903        return (char *)list_entry(request, struct crypto_async_request, list) -
 904               offset;
 905}
 906EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 907
 908struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 909{
 910        return __crypto_dequeue_request(queue, 0);
 911}
 912EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 913
 914int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 915{
 916        struct crypto_async_request *req;
 917
 918        list_for_each_entry(req, &queue->list, list) {
 919                if (req->tfm == tfm)
 920                        return 1;
 921        }
 922
 923        return 0;
 924}
 925EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 926
 927static inline void crypto_inc_byte(u8 *a, unsigned int size)
 928{
 929        u8 *b = (a + size);
 930        u8 c;
 931
 932        for (; size; size--) {
 933                c = *--b + 1;
 934                *b = c;
 935                if (c)
 936                        break;
 937        }
 938}
 939
 940void crypto_inc(u8 *a, unsigned int size)
 941{
 942        __be32 *b = (__be32 *)(a + size);
 943        u32 c;
 944
 945        for (; size >= 4; size -= 4) {
 946                c = be32_to_cpu(*--b) + 1;
 947                *b = cpu_to_be32(c);
 948                if (c)
 949                        return;
 950        }
 951
 952        crypto_inc_byte(a, size);
 953}
 954EXPORT_SYMBOL_GPL(crypto_inc);
 955
 956static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 957{
 958        for (; size; size--)
 959                *a++ ^= *b++;
 960}
 961
 962void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 963{
 964        u32 *a = (u32 *)dst;
 965        u32 *b = (u32 *)src;
 966
 967        for (; size >= 4; size -= 4)
 968                *a++ ^= *b++;
 969
 970        crypto_xor_byte((u8 *)a, (u8 *)b, size);
 971}
 972EXPORT_SYMBOL_GPL(crypto_xor);
 973
 974static int __init crypto_algapi_init(void)
 975{
 976        crypto_init_proc();
 977        return 0;
 978}
 979
 980static void __exit crypto_algapi_exit(void)
 981{
 982        crypto_exit_proc();
 983}
 984
 985module_init(crypto_algapi_init);
 986module_exit(crypto_algapi_exit);
 987
 988MODULE_LICENSE("GPL");
 989MODULE_DESCRIPTION("Cryptographic algorithms API");
 990
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.