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_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; 419 420 err: 421 for (--i; i >= 0; --i) 422 crypto_unregister_alg(&algs[i]); 423 424 return ret; 425 } 426 EXPORT_SYMBOL_GPL(crypto_register_algs); 427 428 int 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 } 441 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 442 443 int 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; 458 out: 459 up_write(&crypto_alg_sem); 460 return err; 461 } 462 EXPORT_SYMBOL_GPL(crypto_register_template); 463 464 void 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 } 492 EXPORT_SYMBOL_GPL(crypto_unregister_template); 493 494 static 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 } 512 513 struct crypto_template *crypto_lookup_template(const char *name) 514 { 515 return try_then_request_module(__crypto_lookup_template(name), name); 516 } 517 EXPORT_SYMBOL_GPL(crypto_lookup_template); 518 519 int 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; 540 541 unlock: 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; 550 551 err: 552 return err; 553 } 554 EXPORT_SYMBOL_GPL(crypto_register_instance); 555 556 int 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 } 583 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 584 585 int 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 } 603 EXPORT_SYMBOL_GPL(crypto_init_spawn); 604 605 int 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); 616 617 out: 618 return err; 619 } 620 EXPORT_SYMBOL_GPL(crypto_init_spawn2); 621 622 void 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 } 631 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 632 633 static 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 } 653 654 struct 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; 673 674 out_put_alg: 675 crypto_mod_put(alg); 676 return tfm; 677 } 678 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 679 680 void *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; 694 695 out_put_alg: 696 crypto_mod_put(alg); 697 return tfm; 698 } 699 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 700 701 int crypto_register_notifier(struct notifier_block *nb) 702 { 703 return blocking_notifier_chain_register(&crypto_chain, nb); 704 } 705 EXPORT_SYMBOL_GPL(crypto_register_notifier); 706 707 int crypto_unregister_notifier(struct notifier_block *nb) 708 { 709 return blocking_notifier_chain_unregister(&crypto_chain, nb); 710 } 711 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 712 713 struct 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 } 729 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 730 731 int 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 } 744 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 745 746 const 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 } 762 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 763 764 struct 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 } 778 EXPORT_SYMBOL_GPL(crypto_attr_alg2); 779 780 int 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 } 796 EXPORT_SYMBOL_GPL(crypto_attr_u32); 797 798 void *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; 822 823 err_free_inst: 824 kfree(p); 825 return ERR_PTR(err); 826 } 827 EXPORT_SYMBOL_GPL(crypto_alloc_instance2); 828 829 struct 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; 848 849 err_free_inst: 850 kfree(inst); 851 inst = ERR_PTR(err); 852 853 out: 854 return inst; 855 } 856 EXPORT_SYMBOL_GPL(crypto_alloc_instance); 857 858 void 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 } 865 EXPORT_SYMBOL_GPL(crypto_init_queue); 866 867 int 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); 882 883 out: 884 return err; 885 } 886 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 887 888 void *__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 } 906 EXPORT_SYMBOL_GPL(__crypto_dequeue_request); 907 908 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 909 { 910 return __crypto_dequeue_request(queue, 0); 911 } 912 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 913 914 int 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 } 925 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); 926 927 static 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 } 939 940 void 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 } 954 EXPORT_SYMBOL_GPL(crypto_inc); 955 956 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) 957 { 958 for (; size; size--) 959 *a++ ^= *b++; 960 } 961 962 void 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 } 972 EXPORT_SYMBOL_GPL(crypto_xor); 973 974 static int __init crypto_algapi_init(void) 975 { 976 crypto_init_proc(); 977 return 0; 978 } 979 980 static void __exit crypto_algapi_exit(void) 981 { 982 crypto_exit_proc(); 983 } 984 985 module_init(crypto_algapi_init); 986 module_exit(crypto_algapi_exit); 987 988 MODULE_LICENSE("GPL"); 989 MODULE_DESCRIPTION("Cryptographic algorithms API"); 990