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 25 static LIST_HEAD(crypto_template_list); 26 27 void 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 } 41 EXPORT_SYMBOL_GPL(crypto_larval_error); 42 43 static 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 60 static 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 74 static 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 83 static 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 } 105 106 static 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 } 129 130 void 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 = ⊤ 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 } 177 EXPORT_SYMBOL_GPL(crypto_remove_spawns); 178 179 static 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); 231 232 out: 233 return larval; 234 235 free_larval: 236 kfree(larval); 237 err: 238 larval = ERR_PTR(ret); 239 goto out; 240 } 241 242 void 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; 262 263 found: 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 } 311 312 complete: 313 complete_all(&test->completion); 314 315 unlock: 316 up_write(&crypto_alg_sem); 317 318 crypto_remove_final(&list); 319 } 320 EXPORT_SYMBOL_GPL(crypto_alg_tested); 321 322 void 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 } 332 EXPORT_SYMBOL_GPL(crypto_remove_final); 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 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 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; 505 506 unlock: 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; 515 516 err: 517 return err; 518 } 519 EXPORT_SYMBOL_GPL(crypto_register_instance); 520 521 int crypto_unregister_instance(struct crypto_alg *alg) 522 { 523 int err; 524 struct crypto_instance *inst = (void *)alg; 525 struct crypto_template *tmpl = inst->tmpl; 526 LIST_HEAD(users); 527 528 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) 529 return -EINVAL; 530 531 BUG_ON(atomic_read(&alg->cra_refcnt) != 1); 532 533 down_write(&crypto_alg_sem); 534 535 hlist_del_init(&inst->list); 536 err = crypto_remove_alg(alg, &users); 537 538 up_write(&crypto_alg_sem); 539 540 if (err) 541 return err; 542 543 tmpl->free(inst); 544 crypto_remove_final(&users); 545 546 return 0; 547 } 548 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 549 550 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 551 struct crypto_instance *inst, u32 mask) 552 { 553 int err = -EAGAIN; 554 555 spawn->inst = inst; 556 spawn->mask = mask; 557 558 down_write(&crypto_alg_sem); 559 if (!crypto_is_moribund(alg)) { 560 list_add(&spawn->list, &alg->cra_users); 561 spawn->alg = alg; 562 err = 0; 563 } 564 up_write(&crypto_alg_sem); 565 566 return err; 567 } 568 EXPORT_SYMBOL_GPL(crypto_init_spawn); 569 570 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, 571 struct crypto_instance *inst, 572 const struct crypto_type *frontend) 573 { 574 int err = -EINVAL; 575 576 if ((alg->cra_flags ^ frontend->type) & frontend->maskset) 577 goto out; 578 579 spawn->frontend = frontend; 580 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); 581 582 out: 583 return err; 584 } 585 EXPORT_SYMBOL_GPL(crypto_init_spawn2); 586 587 void crypto_drop_spawn(struct crypto_spawn *spawn) 588 { 589 if (!spawn->alg) 590 return; 591 592 down_write(&crypto_alg_sem); 593 list_del(&spawn->list); 594 up_write(&crypto_alg_sem); 595 } 596 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 597 598 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 599 { 600 struct crypto_alg *alg; 601 struct crypto_alg *alg2; 602 603 down_read(&crypto_alg_sem); 604 alg = spawn->alg; 605 alg2 = alg; 606 if (alg2) 607 alg2 = crypto_mod_get(alg2); 608 up_read(&crypto_alg_sem); 609 610 if (!alg2) { 611 if (alg) 612 crypto_shoot_alg(alg); 613 return ERR_PTR(-EAGAIN); 614 } 615 616 return alg; 617 } 618 619 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 620 u32 mask) 621 { 622 struct crypto_alg *alg; 623 struct crypto_tfm *tfm; 624 625 alg = crypto_spawn_alg(spawn); 626 if (IS_ERR(alg)) 627 return ERR_CAST(alg); 628 629 tfm = ERR_PTR(-EINVAL); 630 if (unlikely((alg->cra_flags ^ type) & mask)) 631 goto out_put_alg; 632 633 tfm = __crypto_alloc_tfm(alg, type, mask); 634 if (IS_ERR(tfm)) 635 goto out_put_alg; 636 637 return tfm; 638 639 out_put_alg: 640 crypto_mod_put(alg); 641 return tfm; 642 } 643 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 644 645 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 646 { 647 struct crypto_alg *alg; 648 struct crypto_tfm *tfm; 649 650 alg = crypto_spawn_alg(spawn); 651 if (IS_ERR(alg)) 652 return ERR_CAST(alg); 653 654 tfm = crypto_create_tfm(alg, spawn->frontend); 655 if (IS_ERR(tfm)) 656 goto out_put_alg; 657 658 return tfm; 659 660 out_put_alg: 661 crypto_mod_put(alg); 662 return tfm; 663 } 664 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 665 666 int crypto_register_notifier(struct notifier_block *nb) 667 { 668 return blocking_notifier_chain_register(&crypto_chain, nb); 669 } 670 EXPORT_SYMBOL_GPL(crypto_register_notifier); 671 672 int crypto_unregister_notifier(struct notifier_block *nb) 673 { 674 return blocking_notifier_chain_unregister(&crypto_chain, nb); 675 } 676 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 677 678 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 679 { 680 struct rtattr *rta = tb[0]; 681 struct crypto_attr_type *algt; 682 683 if (!rta) 684 return ERR_PTR(-ENOENT); 685 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 686 return ERR_PTR(-EINVAL); 687 if (rta->rta_type != CRYPTOA_TYPE) 688 return ERR_PTR(-EINVAL); 689 690 algt = RTA_DATA(rta); 691 692 return algt; 693 } 694 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 695 696 int crypto_check_attr_type(struct rtattr **tb, u32 type) 697 { 698 struct crypto_attr_type *algt; 699 700 algt = crypto_get_attr_type(tb); 701 if (IS_ERR(algt)) 702 return PTR_ERR(algt); 703 704 if ((algt->type ^ type) & algt->mask) 705 return -EINVAL; 706 707 return 0; 708 } 709 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 710 711 const char *crypto_attr_alg_name(struct rtattr *rta) 712 { 713 struct crypto_attr_alg *alga; 714 715 if (!rta) 716 return ERR_PTR(-ENOENT); 717 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 718 return ERR_PTR(-EINVAL); 719 if (rta->rta_type != CRYPTOA_ALG) 720 return ERR_PTR(-EINVAL); 721 722 alga = RTA_DATA(rta); 723 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 724 725 return alga->name; 726 } 727 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 728 729 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, 730 const struct crypto_type *frontend, 731 u32 type, u32 mask) 732 { 733 const char *name; 734 int err; 735 736 name = crypto_attr_alg_name(rta); 737 err = PTR_ERR(name); 738 if (IS_ERR(name)) 739 return ERR_PTR(err); 740 741 return crypto_find_alg(name, frontend, type, mask); 742 } 743 EXPORT_SYMBOL_GPL(crypto_attr_alg2); 744 745 int crypto_attr_u32(struct rtattr *rta, u32 *num) 746 { 747 struct crypto_attr_u32 *nu32; 748 749 if (!rta) 750 return -ENOENT; 751 if (RTA_PAYLOAD(rta) < sizeof(*nu32)) 752 return -EINVAL; 753 if (rta->rta_type != CRYPTOA_U32) 754 return -EINVAL; 755 756 nu32 = RTA_DATA(rta); 757 *num = nu32->num; 758 759 return 0; 760 } 761 EXPORT_SYMBOL_GPL(crypto_attr_u32); 762 763 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, 764 unsigned int head) 765 { 766 struct crypto_instance *inst; 767 char *p; 768 int err; 769 770 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), 771 GFP_KERNEL); 772 if (!p) 773 return ERR_PTR(-ENOMEM); 774 775 inst = (void *)(p + head); 776 777 err = -ENAMETOOLONG; 778 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 779 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 780 goto err_free_inst; 781 782 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 783 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 784 goto err_free_inst; 785 786 return p; 787 788 err_free_inst: 789 kfree(p); 790 return ERR_PTR(err); 791 } 792 EXPORT_SYMBOL_GPL(crypto_alloc_instance2); 793 794 struct crypto_instance *crypto_alloc_instance(const char *name, 795 struct crypto_alg *alg) 796 { 797 struct crypto_instance *inst; 798 struct crypto_spawn *spawn; 799 int err; 800 801 inst = crypto_alloc_instance2(name, alg, 0); 802 if (IS_ERR(inst)) 803 goto out; 804 805 spawn = crypto_instance_ctx(inst); 806 err = crypto_init_spawn(spawn, alg, inst, 807 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); 808 809 if (err) 810 goto err_free_inst; 811 812 return inst; 813 814 err_free_inst: 815 kfree(inst); 816 inst = ERR_PTR(err); 817 818 out: 819 return inst; 820 } 821 EXPORT_SYMBOL_GPL(crypto_alloc_instance); 822 823 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 824 { 825 INIT_LIST_HEAD(&queue->list); 826 queue->backlog = &queue->list; 827 queue->qlen = 0; 828 queue->max_qlen = max_qlen; 829 } 830 EXPORT_SYMBOL_GPL(crypto_init_queue); 831 832 int crypto_enqueue_request(struct crypto_queue *queue, 833 struct crypto_async_request *request) 834 { 835 int err = -EINPROGRESS; 836 837 if (unlikely(queue->qlen >= queue->max_qlen)) { 838 err = -EBUSY; 839 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) 840 goto out; 841 if (queue->backlog == &queue->list) 842 queue->backlog = &request->list; 843 } 844 845 queue->qlen++; 846 list_add_tail(&request->list, &queue->list); 847 848 out: 849 return err; 850 } 851 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 852 853 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) 854 { 855 struct list_head *request; 856 857 if (unlikely(!queue->qlen)) 858 return NULL; 859 860 queue->qlen--; 861 862 if (queue->backlog != &queue->list) 863 queue->backlog = queue->backlog->next; 864 865 request = queue->list.next; 866 list_del(request); 867 868 return (char *)list_entry(request, struct crypto_async_request, list) - 869 offset; 870 } 871 EXPORT_SYMBOL_GPL(__crypto_dequeue_request); 872 873 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 874 { 875 return __crypto_dequeue_request(queue, 0); 876 } 877 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 878 879 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) 880 { 881 struct crypto_async_request *req; 882 883 list_for_each_entry(req, &queue->list, list) { 884 if (req->tfm == tfm) 885 return 1; 886 } 887 888 return 0; 889 } 890 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); 891 892 static inline void crypto_inc_byte(u8 *a, unsigned int size) 893 { 894 u8 *b = (a + size); 895 u8 c; 896 897 for (; size; size--) { 898 c = *--b + 1; 899 *b = c; 900 if (c) 901 break; 902 } 903 } 904 905 void crypto_inc(u8 *a, unsigned int size) 906 { 907 __be32 *b = (__be32 *)(a + size); 908 u32 c; 909 910 for (; size >= 4; size -= 4) { 911 c = be32_to_cpu(*--b) + 1; 912 *b = cpu_to_be32(c); 913 if (c) 914 return; 915 } 916 917 crypto_inc_byte(a, size); 918 } 919 EXPORT_SYMBOL_GPL(crypto_inc); 920 921 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) 922 { 923 for (; size; size--) 924 *a++ ^= *b++; 925 } 926 927 void crypto_xor(u8 *dst, const u8 *src, unsigned int size) 928 { 929 u32 *a = (u32 *)dst; 930 u32 *b = (u32 *)src; 931 932 for (; size >= 4; size -= 4) 933 *a++ ^= *b++; 934 935 crypto_xor_byte((u8 *)a, (u8 *)b, size); 936 } 937 EXPORT_SYMBOL_GPL(crypto_xor); 938 939 static int __init crypto_algapi_init(void) 940 { 941 crypto_init_proc(); 942 return 0; 943 } 944 945 static void __exit crypto_algapi_exit(void) 946 { 947 crypto_exit_proc(); 948 } 949 950 module_init(crypto_algapi_init); 951 module_exit(crypto_algapi_exit); 952 953 MODULE_LICENSE("GPL"); 954 MODULE_DESCRIPTION("Cryptographic algorithms API"); 955