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/string.h> 21 22 #include "internal.h" 23 24 static void crypto_remove_final(struct list_head *list); 25 26 static LIST_HEAD(crypto_template_list); 27 28 void crypto_larval_error(const char *name, u32 type, u32 mask) 29 { 30 struct crypto_alg *alg; 31 32 alg = crypto_alg_lookup(name, type, mask); 33 34 if (alg) { 35 if (crypto_is_larval(alg)) { 36 struct crypto_larval *larval = (void *)alg; 37 complete_all(&larval->completion); 38 } 39 crypto_mod_put(alg); 40 } 41 } 42 EXPORT_SYMBOL_GPL(crypto_larval_error); 43 44 static inline int crypto_set_driver_name(struct crypto_alg *alg) 45 { 46 static const char suffix[] = "-generic"; 47 char *driver_name = alg->cra_driver_name; 48 int len; 49 50 if (*driver_name) 51 return 0; 52 53 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); 54 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) 55 return -ENAMETOOLONG; 56 57 memcpy(driver_name + len, suffix, sizeof(suffix)); 58 return 0; 59 } 60 61 static int crypto_check_alg(struct crypto_alg *alg) 62 { 63 if (alg->cra_alignmask & (alg->cra_alignmask + 1)) 64 return -EINVAL; 65 66 if (alg->cra_blocksize > PAGE_SIZE / 8) 67 return -EINVAL; 68 69 if (alg->cra_priority < 0) 70 return -EINVAL; 71 72 return crypto_set_driver_name(alg); 73 } 74 75 static void crypto_destroy_instance(struct crypto_alg *alg) 76 { 77 struct crypto_instance *inst = (void *)alg; 78 struct crypto_template *tmpl = inst->tmpl; 79 80 tmpl->free(inst); 81 crypto_tmpl_put(tmpl); 82 } 83 84 static struct list_head *crypto_more_spawns(struct crypto_alg *alg, 85 struct list_head *stack, 86 struct list_head *top, 87 struct list_head *secondary_spawns) 88 { 89 struct crypto_spawn *spawn, *n; 90 91 if (list_empty(stack)) 92 return NULL; 93 94 spawn = list_first_entry(stack, struct crypto_spawn, list); 95 n = list_entry(spawn->list.next, struct crypto_spawn, list); 96 97 if (spawn->alg && &n->list != stack && !n->alg) 98 n->alg = (n->list.next == stack) ? alg : 99 &list_entry(n->list.next, struct crypto_spawn, 100 list)->inst->alg; 101 102 list_move(&spawn->list, secondary_spawns); 103 104 return &n->list == stack ? top : &n->inst->alg.cra_users; 105 } 106 107 static void crypto_remove_spawn(struct crypto_spawn *spawn, 108 struct list_head *list) 109 { 110 struct crypto_instance *inst = spawn->inst; 111 struct crypto_template *tmpl = inst->tmpl; 112 113 if (crypto_is_dead(&inst->alg)) 114 return; 115 116 inst->alg.cra_flags |= CRYPTO_ALG_DEAD; 117 if (hlist_unhashed(&inst->list)) 118 return; 119 120 if (!tmpl || !crypto_tmpl_get(tmpl)) 121 return; 122 123 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); 124 list_move(&inst->alg.cra_list, list); 125 hlist_del(&inst->list); 126 inst->alg.cra_destroy = crypto_destroy_instance; 127 128 BUG_ON(!list_empty(&inst->alg.cra_users)); 129 } 130 131 static void crypto_remove_spawns(struct crypto_alg *alg, 132 struct list_head *list, 133 struct crypto_alg *nalg) 134 { 135 u32 new_type = (nalg ?: alg)->cra_flags; 136 struct crypto_spawn *spawn, *n; 137 LIST_HEAD(secondary_spawns); 138 struct list_head *spawns; 139 LIST_HEAD(stack); 140 LIST_HEAD(top); 141 142 spawns = &alg->cra_users; 143 list_for_each_entry_safe(spawn, n, spawns, list) { 144 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) 145 continue; 146 147 list_move(&spawn->list, &top); 148 } 149 150 spawns = ⊤ 151 do { 152 while (!list_empty(spawns)) { 153 struct crypto_instance *inst; 154 155 spawn = list_first_entry(spawns, struct crypto_spawn, 156 list); 157 inst = spawn->inst; 158 159 BUG_ON(&inst->alg == alg); 160 161 list_move(&spawn->list, &stack); 162 163 if (&inst->alg == nalg) 164 break; 165 166 spawn->alg = NULL; 167 spawns = &inst->alg.cra_users; 168 } 169 } while ((spawns = crypto_more_spawns(alg, &stack, &top, 170 &secondary_spawns))); 171 172 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { 173 if (spawn->alg) 174 list_move(&spawn->list, &spawn->alg->cra_users); 175 else 176 crypto_remove_spawn(spawn, list); 177 } 178 } 179 180 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) 181 { 182 struct crypto_alg *q; 183 struct crypto_larval *larval; 184 int ret = -EAGAIN; 185 186 if (crypto_is_dead(alg)) 187 goto err; 188 189 INIT_LIST_HEAD(&alg->cra_users); 190 191 /* No cheating! */ 192 alg->cra_flags &= ~CRYPTO_ALG_TESTED; 193 194 ret = -EEXIST; 195 196 atomic_set(&alg->cra_refcnt, 1); 197 list_for_each_entry(q, &crypto_alg_list, cra_list) { 198 if (q == alg) 199 goto err; 200 201 if (crypto_is_moribund(q)) 202 continue; 203 204 if (crypto_is_larval(q)) { 205 if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) 206 goto err; 207 continue; 208 } 209 210 if (!strcmp(q->cra_driver_name, alg->cra_name) || 211 !strcmp(q->cra_name, alg->cra_driver_name)) 212 goto err; 213 } 214 215 larval = crypto_larval_alloc(alg->cra_name, 216 alg->cra_flags | CRYPTO_ALG_TESTED, 0); 217 if (IS_ERR(larval)) 218 goto out; 219 220 ret = -ENOENT; 221 larval->adult = crypto_mod_get(alg); 222 if (!larval->adult) 223 goto free_larval; 224 225 atomic_set(&larval->alg.cra_refcnt, 1); 226 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, 227 CRYPTO_MAX_ALG_NAME); 228 larval->alg.cra_priority = alg->cra_priority; 229 230 list_add(&alg->cra_list, &crypto_alg_list); 231 list_add(&larval->alg.cra_list, &crypto_alg_list); 232 233 out: 234 return larval; 235 236 free_larval: 237 kfree(larval); 238 err: 239 larval = ERR_PTR(ret); 240 goto out; 241 } 242 243 void crypto_alg_tested(const char *name, int err) 244 { 245 struct crypto_larval *test; 246 struct crypto_alg *alg; 247 struct crypto_alg *q; 248 LIST_HEAD(list); 249 250 down_write(&crypto_alg_sem); 251 list_for_each_entry(q, &crypto_alg_list, cra_list) { 252 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 253 continue; 254 255 test = (struct crypto_larval *)q; 256 257 if (!strcmp(q->cra_driver_name, name)) 258 goto found; 259 } 260 261 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); 262 goto unlock; 263 264 found: 265 q->cra_flags |= CRYPTO_ALG_DEAD; 266 alg = test->adult; 267 if (err || list_empty(&alg->cra_list)) 268 goto complete; 269 270 alg->cra_flags |= CRYPTO_ALG_TESTED; 271 272 list_for_each_entry(q, &crypto_alg_list, cra_list) { 273 if (q == alg) 274 continue; 275 276 if (crypto_is_moribund(q)) 277 continue; 278 279 if (crypto_is_larval(q)) { 280 struct crypto_larval *larval = (void *)q; 281 282 /* 283 * Check to see if either our generic name or 284 * specific name can satisfy the name requested 285 * by the larval entry q. 286 */ 287 if (strcmp(alg->cra_name, q->cra_name) && 288 strcmp(alg->cra_driver_name, q->cra_name)) 289 continue; 290 291 if (larval->adult) 292 continue; 293 if ((q->cra_flags ^ alg->cra_flags) & larval->mask) 294 continue; 295 if (!crypto_mod_get(alg)) 296 continue; 297 298 larval->adult = alg; 299 complete_all(&larval->completion); 300 continue; 301 } 302 303 if (strcmp(alg->cra_name, q->cra_name)) 304 continue; 305 306 if (strcmp(alg->cra_driver_name, q->cra_driver_name) && 307 q->cra_priority > alg->cra_priority) 308 continue; 309 310 crypto_remove_spawns(q, &list, alg); 311 } 312 313 complete: 314 complete_all(&test->completion); 315 316 unlock: 317 up_write(&crypto_alg_sem); 318 319 crypto_remove_final(&list); 320 } 321 EXPORT_SYMBOL_GPL(crypto_alg_tested); 322 323 static void crypto_remove_final(struct list_head *list) 324 { 325 struct crypto_alg *alg; 326 struct crypto_alg *n; 327 328 list_for_each_entry_safe(alg, n, list, cra_list) { 329 list_del_init(&alg->cra_list); 330 crypto_alg_put(alg); 331 } 332 } 333 334 static 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); 347 348 out: 349 crypto_larval_kill(&larval->alg); 350 } 351 352 int 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 } 371 EXPORT_SYMBOL_GPL(crypto_register_alg); 372 373 static 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 } 386 387 int 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 } 406 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 407 408 int crypto_register_template(struct crypto_template *tmpl) 409 { 410 struct crypto_template *q; 411 int err = -EEXIST; 412 413 down_write(&crypto_alg_sem); 414 415 list_for_each_entry(q, &crypto_template_list, list) { 416 if (q == tmpl) 417 goto out; 418 } 419 420 list_add(&tmpl->list, &crypto_template_list); 421 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); 422 err = 0; 423 out: 424 up_write(&crypto_alg_sem); 425 return err; 426 } 427 EXPORT_SYMBOL_GPL(crypto_register_template); 428 429 void crypto_unregister_template(struct crypto_template *tmpl) 430 { 431 struct crypto_instance *inst; 432 struct hlist_node *p, *n; 433 struct hlist_head *list; 434 LIST_HEAD(users); 435 436 down_write(&crypto_alg_sem); 437 438 BUG_ON(list_empty(&tmpl->list)); 439 list_del_init(&tmpl->list); 440 441 list = &tmpl->instances; 442 hlist_for_each_entry(inst, p, list, list) { 443 int err = crypto_remove_alg(&inst->alg, &users); 444 BUG_ON(err); 445 } 446 447 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); 448 449 up_write(&crypto_alg_sem); 450 451 hlist_for_each_entry_safe(inst, p, n, list, list) { 452 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); 453 tmpl->free(inst); 454 } 455 crypto_remove_final(&users); 456 } 457 EXPORT_SYMBOL_GPL(crypto_unregister_template); 458 459 static struct crypto_template *__crypto_lookup_template(const char *name) 460 { 461 struct crypto_template *q, *tmpl = NULL; 462 463 down_read(&crypto_alg_sem); 464 list_for_each_entry(q, &crypto_template_list, list) { 465 if (strcmp(q->name, name)) 466 continue; 467 if (unlikely(!crypto_tmpl_get(q))) 468 continue; 469 470 tmpl = q; 471 break; 472 } 473 up_read(&crypto_alg_sem); 474 475 return tmpl; 476 } 477 478 struct crypto_template *crypto_lookup_template(const char *name) 479 { 480 return try_then_request_module(__crypto_lookup_template(name), name); 481 } 482 EXPORT_SYMBOL_GPL(crypto_lookup_template); 483 484 int crypto_register_instance(struct crypto_template *tmpl, 485 struct crypto_instance *inst) 486 { 487 struct crypto_larval *larval; 488 int err; 489 490 err = crypto_check_alg(&inst->alg); 491 if (err) 492 goto err; 493 494 inst->alg.cra_module = tmpl->module; 495 496 down_write(&crypto_alg_sem); 497 498 larval = __crypto_register_alg(&inst->alg); 499 if (IS_ERR(larval)) 500 goto unlock; 501 502 hlist_add_head(&inst->list, &tmpl->instances); 503 inst->tmpl = tmpl; 504 505 unlock: 506 up_write(&crypto_alg_sem); 507 508 err = PTR_ERR(larval); 509 if (IS_ERR(larval)) 510 goto err; 511 512 crypto_wait_for_test(larval); 513 err = 0; 514 515 err: 516 return err; 517 } 518 EXPORT_SYMBOL_GPL(crypto_register_instance); 519 520 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 521 struct crypto_instance *inst, u32 mask) 522 { 523 int err = -EAGAIN; 524 525 spawn->inst = inst; 526 spawn->mask = mask; 527 528 down_write(&crypto_alg_sem); 529 if (!crypto_is_moribund(alg)) { 530 list_add(&spawn->list, &alg->cra_users); 531 spawn->alg = alg; 532 err = 0; 533 } 534 up_write(&crypto_alg_sem); 535 536 return err; 537 } 538 EXPORT_SYMBOL_GPL(crypto_init_spawn); 539 540 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, 541 struct crypto_instance *inst, 542 const struct crypto_type *frontend) 543 { 544 int err = -EINVAL; 545 546 if (frontend && (alg->cra_flags ^ frontend->type) & frontend->maskset) 547 goto out; 548 549 spawn->frontend = frontend; 550 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); 551 552 out: 553 return err; 554 } 555 EXPORT_SYMBOL_GPL(crypto_init_spawn2); 556 557 void crypto_drop_spawn(struct crypto_spawn *spawn) 558 { 559 if (!spawn->alg) 560 return; 561 562 down_write(&crypto_alg_sem); 563 list_del(&spawn->list); 564 up_write(&crypto_alg_sem); 565 } 566 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 567 568 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 569 { 570 struct crypto_alg *alg; 571 struct crypto_alg *alg2; 572 573 down_read(&crypto_alg_sem); 574 alg = spawn->alg; 575 alg2 = alg; 576 if (alg2) 577 alg2 = crypto_mod_get(alg2); 578 up_read(&crypto_alg_sem); 579 580 if (!alg2) { 581 if (alg) 582 crypto_shoot_alg(alg); 583 return ERR_PTR(-EAGAIN); 584 } 585 586 return alg; 587 } 588 589 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 590 u32 mask) 591 { 592 struct crypto_alg *alg; 593 struct crypto_tfm *tfm; 594 595 alg = crypto_spawn_alg(spawn); 596 if (IS_ERR(alg)) 597 return ERR_CAST(alg); 598 599 tfm = ERR_PTR(-EINVAL); 600 if (unlikely((alg->cra_flags ^ type) & mask)) 601 goto out_put_alg; 602 603 tfm = __crypto_alloc_tfm(alg, type, mask); 604 if (IS_ERR(tfm)) 605 goto out_put_alg; 606 607 return tfm; 608 609 out_put_alg: 610 crypto_mod_put(alg); 611 return tfm; 612 } 613 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 614 615 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 616 { 617 struct crypto_alg *alg; 618 struct crypto_tfm *tfm; 619 620 alg = crypto_spawn_alg(spawn); 621 if (IS_ERR(alg)) 622 return ERR_CAST(alg); 623 624 tfm = crypto_create_tfm(alg, spawn->frontend); 625 if (IS_ERR(tfm)) 626 goto out_put_alg; 627 628 return tfm; 629 630 out_put_alg: 631 crypto_mod_put(alg); 632 return tfm; 633 } 634 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 635 636 int crypto_register_notifier(struct notifier_block *nb) 637 { 638 return blocking_notifier_chain_register(&crypto_chain, nb); 639 } 640 EXPORT_SYMBOL_GPL(crypto_register_notifier); 641 642 int crypto_unregister_notifier(struct notifier_block *nb) 643 { 644 return blocking_notifier_chain_unregister(&crypto_chain, nb); 645 } 646 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 647 648 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 649 { 650 struct rtattr *rta = tb[0]; 651 struct crypto_attr_type *algt; 652 653 if (!rta) 654 return ERR_PTR(-ENOENT); 655 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 656 return ERR_PTR(-EINVAL); 657 if (rta->rta_type != CRYPTOA_TYPE) 658 return ERR_PTR(-EINVAL); 659 660 algt = RTA_DATA(rta); 661 662 return algt; 663 } 664 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 665 666 int crypto_check_attr_type(struct rtattr **tb, u32 type) 667 { 668 struct crypto_attr_type *algt; 669 670 algt = crypto_get_attr_type(tb); 671 if (IS_ERR(algt)) 672 return PTR_ERR(algt); 673 674 if ((algt->type ^ type) & algt->mask) 675 return -EINVAL; 676 677 return 0; 678 } 679 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 680 681 const char *crypto_attr_alg_name(struct rtattr *rta) 682 { 683 struct crypto_attr_alg *alga; 684 685 if (!rta) 686 return ERR_PTR(-ENOENT); 687 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 688 return ERR_PTR(-EINVAL); 689 if (rta->rta_type != CRYPTOA_ALG) 690 return ERR_PTR(-EINVAL); 691 692 alga = RTA_DATA(rta); 693 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 694 695 return alga->name; 696 } 697 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 698 699 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, 700 const struct crypto_type *frontend, 701 u32 type, u32 mask) 702 { 703 const char *name; 704 int err; 705 706 name = crypto_attr_alg_name(rta); 707 err = PTR_ERR(name); 708 if (IS_ERR(name)) 709 return ERR_PTR(err); 710 711 return crypto_find_alg(name, frontend, type, mask); 712 } 713 EXPORT_SYMBOL_GPL(crypto_attr_alg2); 714 715 int crypto_attr_u32(struct rtattr *rta, u32 *num) 716 { 717 struct crypto_attr_u32 *nu32; 718 719 if (!rta) 720 return -ENOENT; 721 if (RTA_PAYLOAD(rta) < sizeof(*nu32)) 722 return -EINVAL; 723 if (rta->rta_type != CRYPTOA_U32) 724 return -EINVAL; 725 726 nu32 = RTA_DATA(rta); 727 *num = nu32->num; 728 729 return 0; 730 } 731 EXPORT_SYMBOL_GPL(crypto_attr_u32); 732 733 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, 734 unsigned int head) 735 { 736 struct crypto_instance *inst; 737 char *p; 738 int err; 739 740 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), 741 GFP_KERNEL); 742 if (!p) 743 return ERR_PTR(-ENOMEM); 744 745 inst = (void *)(p + head); 746 747 err = -ENAMETOOLONG; 748 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 749 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 750 goto err_free_inst; 751 752 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 753 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 754 goto err_free_inst; 755 756 return p; 757 758 err_free_inst: 759 kfree(p); 760 return ERR_PTR(err); 761 } 762 EXPORT_SYMBOL_GPL(crypto_alloc_instance2); 763 764 struct crypto_instance *crypto_alloc_instance(const char *name, 765 struct crypto_alg *alg) 766 { 767 struct crypto_instance *inst; 768 struct crypto_spawn *spawn; 769 int err; 770 771 inst = crypto_alloc_instance2(name, alg, 0); 772 if (IS_ERR(inst)) 773 goto out; 774 775 spawn = crypto_instance_ctx(inst); 776 err = crypto_init_spawn(spawn, alg, inst, 777 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); 778 779 if (err) 780 goto err_free_inst; 781 782 return inst; 783 784 err_free_inst: 785 kfree(inst); 786 inst = ERR_PTR(err); 787 788 out: 789 return inst; 790 } 791 EXPORT_SYMBOL_GPL(crypto_alloc_instance); 792 793 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 794 { 795 INIT_LIST_HEAD(&queue->list); 796 queue->backlog = &queue->list; 797 queue->qlen = 0; 798 queue->max_qlen = max_qlen; 799 } 800 EXPORT_SYMBOL_GPL(crypto_init_queue); 801 802 int crypto_enqueue_request(struct crypto_queue *queue, 803 struct crypto_async_request *request) 804 { 805 int err = -EINPROGRESS; 806 807 if (unlikely(queue->qlen >= queue->max_qlen)) { 808 err = -EBUSY; 809 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) 810 goto out; 811 if (queue->backlog == &queue->list) 812 queue->backlog = &request->list; 813 } 814 815 queue->qlen++; 816 list_add_tail(&request->list, &queue->list); 817 818 out: 819 return err; 820 } 821 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 822 823 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) 824 { 825 struct list_head *request; 826 827 if (unlikely(!queue->qlen)) 828 return NULL; 829 830 queue->qlen--; 831 832 if (queue->backlog != &queue->list) 833 queue->backlog = queue->backlog->next; 834 835 request = queue->list.next; 836 list_del(request); 837 838 return (char *)list_entry(request, struct crypto_async_request, list) - 839 offset; 840 } 841 EXPORT_SYMBOL_GPL(__crypto_dequeue_request); 842 843 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 844 { 845 return __crypto_dequeue_request(queue, 0); 846 } 847 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 848 849 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) 850 { 851 struct crypto_async_request *req; 852 853 list_for_each_entry(req, &queue->list, list) { 854 if (req->tfm == tfm) 855 return 1; 856 } 857 858 return 0; 859 } 860 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); 861 862 static inline void crypto_inc_byte(u8 *a, unsigned int size) 863 { 864 u8 *b = (a + size); 865 u8 c; 866 867 for (; size; size--) { 868 c = *--b + 1; 869 *b = c; 870 if (c) 871 break; 872 } 873 } 874 875 void crypto_inc(u8 *a, unsigned int size) 876 { 877 __be32 *b = (__be32 *)(a + size); 878 u32 c; 879 880 for (; size >= 4; size -= 4) { 881 c = be32_to_cpu(*--b) + 1; 882 *b = cpu_to_be32(c); 883 if (c) 884 return; 885 } 886 887 crypto_inc_byte(a, size); 888 } 889 EXPORT_SYMBOL_GPL(crypto_inc); 890 891 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) 892 { 893 for (; size; size--) 894 *a++ ^= *b++; 895 } 896 897 void crypto_xor(u8 *dst, const u8 *src, unsigned int size) 898 { 899 u32 *a = (u32 *)dst; 900 u32 *b = (u32 *)src; 901 902 for (; size >= 4; size -= 4) 903 *a++ ^= *b++; 904 905 crypto_xor_byte((u8 *)a, (u8 *)b, size); 906 } 907 EXPORT_SYMBOL_GPL(crypto_xor); 908 909 static int __init crypto_algapi_init(void) 910 { 911 crypto_init_proc(); 912 return 0; 913 } 914 915 static void __exit crypto_algapi_exit(void) 916 { 917 crypto_exit_proc(); 918 } 919 920 module_init(crypto_algapi_init); 921 module_exit(crypto_algapi_exit); 922 923 MODULE_LICENSE("GPL"); 924 MODULE_DESCRIPTION("Cryptographic algorithms API"); 925