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