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/fips.h> 16 #include <linux/init.h> 17 #include <linux/kernel.h> 18 #include <linux/list.h> 19 #include <linux/module.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 24 #include "internal.h" 25 26 static LIST_HEAD(crypto_template_list); 27 28 static inline int crypto_set_driver_name(struct crypto_alg *alg) 29 { 30 static const char suffix[] = "-generic"; 31 char *driver_name = alg->cra_driver_name; 32 int len; 33 34 if (*driver_name) 35 return 0; 36 37 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); 38 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) 39 return -ENAMETOOLONG; 40 41 memcpy(driver_name + len, suffix, sizeof(suffix)); 42 return 0; 43 } 44 45 static inline void crypto_check_module_sig(struct module *mod) 46 { 47 if (fips_enabled && mod && !module_sig_ok(mod)) 48 panic("Module %s signature verification failed in FIPS mode\n", 49 module_name(mod)); 50 } 51 52 static int crypto_check_alg(struct crypto_alg *alg) 53 { 54 crypto_check_module_sig(alg->cra_module); 55 56 if (alg->cra_alignmask & (alg->cra_alignmask + 1)) 57 return -EINVAL; 58 59 if (alg->cra_blocksize > PAGE_SIZE / 8) 60 return -EINVAL; 61 62 if (alg->cra_priority < 0) 63 return -EINVAL; 64 65 atomic_set(&alg->cra_refcnt, 1); 66 67 return crypto_set_driver_name(alg); 68 } 69 70 static void crypto_free_instance(struct crypto_instance *inst) 71 { 72 if (!inst->alg.cra_type->free) { 73 inst->tmpl->free(inst); 74 return; 75 } 76 77 inst->alg.cra_type->free(inst); 78 } 79 80 static void crypto_destroy_instance(struct crypto_alg *alg) 81 { 82 struct crypto_instance *inst = (void *)alg; 83 struct crypto_template *tmpl = inst->tmpl; 84 85 crypto_free_instance(inst); 86 crypto_tmpl_put(tmpl); 87 } 88 89 static struct list_head *crypto_more_spawns(struct crypto_alg *alg, 90 struct list_head *stack, 91 struct list_head *top, 92 struct list_head *secondary_spawns) 93 { 94 struct crypto_spawn *spawn, *n; 95 96 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list); 97 if (!spawn) 98 return NULL; 99 100 n = list_next_entry(spawn, list); 101 102 if (spawn->alg && &n->list != stack && !n->alg) 103 n->alg = (n->list.next == stack) ? alg : 104 &list_next_entry(n, list)->inst->alg; 105 106 list_move(&spawn->list, secondary_spawns); 107 108 return &n->list == stack ? top : &n->inst->alg.cra_users; 109 } 110 111 static void crypto_remove_instance(struct crypto_instance *inst, 112 struct list_head *list) 113 { 114 struct crypto_template *tmpl = inst->tmpl; 115 116 if (crypto_is_dead(&inst->alg)) 117 return; 118 119 inst->alg.cra_flags |= CRYPTO_ALG_DEAD; 120 if (hlist_unhashed(&inst->list)) 121 return; 122 123 if (!tmpl || !crypto_tmpl_get(tmpl)) 124 return; 125 126 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); 127 list_move(&inst->alg.cra_list, list); 128 hlist_del(&inst->list); 129 inst->alg.cra_destroy = crypto_destroy_instance; 130 131 BUG_ON(!list_empty(&inst->alg.cra_users)); 132 } 133 134 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, 135 struct crypto_alg *nalg) 136 { 137 u32 new_type = (nalg ?: alg)->cra_flags; 138 struct crypto_spawn *spawn, *n; 139 LIST_HEAD(secondary_spawns); 140 struct list_head *spawns; 141 LIST_HEAD(stack); 142 LIST_HEAD(top); 143 144 spawns = &alg->cra_users; 145 list_for_each_entry_safe(spawn, n, spawns, list) { 146 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) 147 continue; 148 149 list_move(&spawn->list, &top); 150 } 151 152 spawns = ⊤ 153 do { 154 while (!list_empty(spawns)) { 155 struct crypto_instance *inst; 156 157 spawn = list_first_entry(spawns, struct crypto_spawn, 158 list); 159 inst = spawn->inst; 160 161 BUG_ON(&inst->alg == alg); 162 163 list_move(&spawn->list, &stack); 164 165 if (&inst->alg == nalg) 166 break; 167 168 spawn->alg = NULL; 169 spawns = &inst->alg.cra_users; 170 } 171 } while ((spawns = crypto_more_spawns(alg, &stack, &top, 172 &secondary_spawns))); 173 174 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { 175 if (spawn->alg) 176 list_move(&spawn->list, &spawn->alg->cra_users); 177 else 178 crypto_remove_instance(spawn->inst, list); 179 } 180 } 181 EXPORT_SYMBOL_GPL(crypto_remove_spawns); 182 183 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) 184 { 185 struct crypto_alg *q; 186 struct crypto_larval *larval; 187 int ret = -EAGAIN; 188 189 if (crypto_is_dead(alg)) 190 goto err; 191 192 INIT_LIST_HEAD(&alg->cra_users); 193 194 /* No cheating! */ 195 alg->cra_flags &= ~CRYPTO_ALG_TESTED; 196 197 ret = -EEXIST; 198 199 list_for_each_entry(q, &crypto_alg_list, cra_list) { 200 if (q == alg) 201 goto err; 202 203 if (crypto_is_moribund(q)) 204 continue; 205 206 if (crypto_is_larval(q)) { 207 if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) 208 goto err; 209 continue; 210 } 211 212 if (!strcmp(q->cra_driver_name, alg->cra_name) || 213 !strcmp(q->cra_name, alg->cra_driver_name)) 214 goto err; 215 } 216 217 larval = crypto_larval_alloc(alg->cra_name, 218 alg->cra_flags | CRYPTO_ALG_TESTED, 0); 219 if (IS_ERR(larval)) 220 goto out; 221 222 ret = -ENOENT; 223 larval->adult = crypto_mod_get(alg); 224 if (!larval->adult) 225 goto free_larval; 226 227 atomic_set(&larval->alg.cra_refcnt, 1); 228 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, 229 CRYPTO_MAX_ALG_NAME); 230 larval->alg.cra_priority = alg->cra_priority; 231 232 list_add(&alg->cra_list, &crypto_alg_list); 233 list_add(&larval->alg.cra_list, &crypto_alg_list); 234 235 out: 236 return larval; 237 238 free_larval: 239 kfree(larval); 240 err: 241 larval = ERR_PTR(ret); 242 goto out; 243 } 244 245 void crypto_alg_tested(const char *name, int err) 246 { 247 struct crypto_larval *test; 248 struct crypto_alg *alg; 249 struct crypto_alg *q; 250 LIST_HEAD(list); 251 252 down_write(&crypto_alg_sem); 253 list_for_each_entry(q, &crypto_alg_list, cra_list) { 254 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 255 continue; 256 257 test = (struct crypto_larval *)q; 258 259 if (!strcmp(q->cra_driver_name, name)) 260 goto found; 261 } 262 263 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); 264 goto unlock; 265 266 found: 267 q->cra_flags |= CRYPTO_ALG_DEAD; 268 alg = test->adult; 269 if (err || list_empty(&alg->cra_list)) 270 goto complete; 271 272 alg->cra_flags |= CRYPTO_ALG_TESTED; 273 274 list_for_each_entry(q, &crypto_alg_list, cra_list) { 275 if (q == alg) 276 continue; 277 278 if (crypto_is_moribund(q)) 279 continue; 280 281 if (crypto_is_larval(q)) { 282 struct crypto_larval *larval = (void *)q; 283 284 /* 285 * Check to see if either our generic name or 286 * specific name can satisfy the name requested 287 * by the larval entry q. 288 */ 289 if (strcmp(alg->cra_name, q->cra_name) && 290 strcmp(alg->cra_driver_name, q->cra_name)) 291 continue; 292 293 if (larval->adult) 294 continue; 295 if ((q->cra_flags ^ alg->cra_flags) & larval->mask) 296 continue; 297 if (!crypto_mod_get(alg)) 298 continue; 299 300 larval->adult = alg; 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 } 313 314 complete: 315 complete_all(&test->completion); 316 317 unlock: 318 up_write(&crypto_alg_sem); 319 320 crypto_remove_final(&list); 321 } 322 EXPORT_SYMBOL_GPL(crypto_alg_tested); 323 324 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 EXPORT_SYMBOL_GPL(crypto_remove_final); 335 336 static void crypto_wait_for_test(struct crypto_larval *larval) 337 { 338 int err; 339 340 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); 341 if (err != NOTIFY_STOP) { 342 if (WARN_ON(err != NOTIFY_DONE)) 343 goto out; 344 crypto_alg_tested(larval->alg.cra_driver_name, 0); 345 } 346 347 err = wait_for_completion_killable(&larval->completion); 348 WARN_ON(err); 349 350 out: 351 crypto_larval_kill(&larval->alg); 352 } 353 354 int crypto_register_alg(struct crypto_alg *alg) 355 { 356 struct crypto_larval *larval; 357 int err; 358 359 err = crypto_check_alg(alg); 360 if (err) 361 return err; 362 363 down_write(&crypto_alg_sem); 364 larval = __crypto_register_alg(alg); 365 up_write(&crypto_alg_sem); 366 367 if (IS_ERR(larval)) 368 return PTR_ERR(larval); 369 370 crypto_wait_for_test(larval); 371 return 0; 372 } 373 EXPORT_SYMBOL_GPL(crypto_register_alg); 374 375 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) 376 { 377 if (unlikely(list_empty(&alg->cra_list))) 378 return -ENOENT; 379 380 alg->cra_flags |= CRYPTO_ALG_DEAD; 381 382 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); 383 list_del_init(&alg->cra_list); 384 crypto_remove_spawns(alg, list, NULL); 385 386 return 0; 387 } 388 389 int crypto_unregister_alg(struct crypto_alg *alg) 390 { 391 int ret; 392 LIST_HEAD(list); 393 394 down_write(&crypto_alg_sem); 395 ret = crypto_remove_alg(alg, &list); 396 up_write(&crypto_alg_sem); 397 398 if (ret) 399 return ret; 400 401 BUG_ON(atomic_read(&alg->cra_refcnt) != 1); 402 if (alg->cra_destroy) 403 alg->cra_destroy(alg); 404 405 crypto_remove_final(&list); 406 return 0; 407 } 408 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 409 410 int crypto_register_algs(struct crypto_alg *algs, int count) 411 { 412 int i, ret; 413 414 for (i = 0; i < count; i++) { 415 ret = crypto_register_alg(&algs[i]); 416 if (ret) 417 goto err; 418 } 419 420 return 0; 421 422 err: 423 for (--i; i >= 0; --i) 424 crypto_unregister_alg(&algs[i]); 425 426 return ret; 427 } 428 EXPORT_SYMBOL_GPL(crypto_register_algs); 429 430 int crypto_unregister_algs(struct crypto_alg *algs, int count) 431 { 432 int i, ret; 433 434 for (i = 0; i < count; i++) { 435 ret = crypto_unregister_alg(&algs[i]); 436 if (ret) 437 pr_err("Failed to unregister %s %s: %d\n", 438 algs[i].cra_driver_name, algs[i].cra_name, ret); 439 } 440 441 return 0; 442 } 443 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 444 445 int crypto_register_template(struct crypto_template *tmpl) 446 { 447 struct crypto_template *q; 448 int err = -EEXIST; 449 450 down_write(&crypto_alg_sem); 451 452 crypto_check_module_sig(tmpl->module); 453 454 list_for_each_entry(q, &crypto_template_list, list) { 455 if (q == tmpl) 456 goto out; 457 } 458 459 list_add(&tmpl->list, &crypto_template_list); 460 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); 461 err = 0; 462 out: 463 up_write(&crypto_alg_sem); 464 return err; 465 } 466 EXPORT_SYMBOL_GPL(crypto_register_template); 467 468 void crypto_unregister_template(struct crypto_template *tmpl) 469 { 470 struct crypto_instance *inst; 471 struct hlist_node *n; 472 struct hlist_head *list; 473 LIST_HEAD(users); 474 475 down_write(&crypto_alg_sem); 476 477 BUG_ON(list_empty(&tmpl->list)); 478 list_del_init(&tmpl->list); 479 480 list = &tmpl->instances; 481 hlist_for_each_entry(inst, list, list) { 482 int err = crypto_remove_alg(&inst->alg, &users); 483 484 BUG_ON(err); 485 } 486 487 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); 488 489 up_write(&crypto_alg_sem); 490 491 hlist_for_each_entry_safe(inst, n, list, list) { 492 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); 493 crypto_free_instance(inst); 494 } 495 crypto_remove_final(&users); 496 } 497 EXPORT_SYMBOL_GPL(crypto_unregister_template); 498 499 static struct crypto_template *__crypto_lookup_template(const char *name) 500 { 501 struct crypto_template *q, *tmpl = NULL; 502 503 down_read(&crypto_alg_sem); 504 list_for_each_entry(q, &crypto_template_list, list) { 505 if (strcmp(q->name, name)) 506 continue; 507 if (unlikely(!crypto_tmpl_get(q))) 508 continue; 509 510 tmpl = q; 511 break; 512 } 513 up_read(&crypto_alg_sem); 514 515 return tmpl; 516 } 517 518 struct crypto_template *crypto_lookup_template(const char *name) 519 { 520 return try_then_request_module(__crypto_lookup_template(name), 521 "crypto-%s", name); 522 } 523 EXPORT_SYMBOL_GPL(crypto_lookup_template); 524 525 int crypto_register_instance(struct crypto_template *tmpl, 526 struct crypto_instance *inst) 527 { 528 struct crypto_larval *larval; 529 int err; 530 531 err = crypto_check_alg(&inst->alg); 532 if (err) 533 return err; 534 535 inst->alg.cra_module = tmpl->module; 536 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 537 538 if (unlikely(!crypto_mod_get(&inst->alg))) 539 return -EAGAIN; 540 541 down_write(&crypto_alg_sem); 542 543 larval = __crypto_register_alg(&inst->alg); 544 if (IS_ERR(larval)) 545 goto unlock; 546 547 hlist_add_head(&inst->list, &tmpl->instances); 548 inst->tmpl = tmpl; 549 550 unlock: 551 up_write(&crypto_alg_sem); 552 553 err = PTR_ERR(larval); 554 if (IS_ERR(larval)) 555 goto err; 556 557 crypto_wait_for_test(larval); 558 559 /* Remove instance if test failed */ 560 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) 561 crypto_unregister_instance(inst); 562 err = 0; 563 564 err: 565 crypto_mod_put(&inst->alg); 566 return err; 567 } 568 EXPORT_SYMBOL_GPL(crypto_register_instance); 569 570 int crypto_unregister_instance(struct crypto_instance *inst) 571 { 572 LIST_HEAD(list); 573 574 down_write(&crypto_alg_sem); 575 576 crypto_remove_spawns(&inst->alg, &list, NULL); 577 crypto_remove_instance(inst, &list); 578 579 up_write(&crypto_alg_sem); 580 581 crypto_remove_final(&list); 582 583 return 0; 584 } 585 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 586 587 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 588 struct crypto_instance *inst, u32 mask) 589 { 590 int err = -EAGAIN; 591 592 spawn->inst = inst; 593 spawn->mask = mask; 594 595 down_write(&crypto_alg_sem); 596 if (!crypto_is_moribund(alg)) { 597 list_add(&spawn->list, &alg->cra_users); 598 spawn->alg = alg; 599 err = 0; 600 } 601 up_write(&crypto_alg_sem); 602 603 return err; 604 } 605 EXPORT_SYMBOL_GPL(crypto_init_spawn); 606 607 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, 608 struct crypto_instance *inst, 609 const struct crypto_type *frontend) 610 { 611 int err = -EINVAL; 612 613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset) 614 goto out; 615 616 spawn->frontend = frontend; 617 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); 618 619 out: 620 return err; 621 } 622 EXPORT_SYMBOL_GPL(crypto_init_spawn2); 623 624 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, 625 u32 type, u32 mask) 626 { 627 struct crypto_alg *alg; 628 int err; 629 630 alg = crypto_find_alg(name, spawn->frontend, type, mask); 631 if (IS_ERR(alg)) 632 return PTR_ERR(alg); 633 634 err = crypto_init_spawn(spawn, alg, spawn->inst, mask); 635 crypto_mod_put(alg); 636 return err; 637 } 638 EXPORT_SYMBOL_GPL(crypto_grab_spawn); 639 640 void crypto_drop_spawn(struct crypto_spawn *spawn) 641 { 642 if (!spawn->alg) 643 return; 644 645 down_write(&crypto_alg_sem); 646 list_del(&spawn->list); 647 up_write(&crypto_alg_sem); 648 } 649 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 650 651 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 652 { 653 struct crypto_alg *alg; 654 struct crypto_alg *alg2; 655 656 down_read(&crypto_alg_sem); 657 alg = spawn->alg; 658 alg2 = alg; 659 if (alg2) 660 alg2 = crypto_mod_get(alg2); 661 up_read(&crypto_alg_sem); 662 663 if (!alg2) { 664 if (alg) 665 crypto_shoot_alg(alg); 666 return ERR_PTR(-EAGAIN); 667 } 668 669 return alg; 670 } 671 672 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 673 u32 mask) 674 { 675 struct crypto_alg *alg; 676 struct crypto_tfm *tfm; 677 678 alg = crypto_spawn_alg(spawn); 679 if (IS_ERR(alg)) 680 return ERR_CAST(alg); 681 682 tfm = ERR_PTR(-EINVAL); 683 if (unlikely((alg->cra_flags ^ type) & mask)) 684 goto out_put_alg; 685 686 tfm = __crypto_alloc_tfm(alg, type, mask); 687 if (IS_ERR(tfm)) 688 goto out_put_alg; 689 690 return tfm; 691 692 out_put_alg: 693 crypto_mod_put(alg); 694 return tfm; 695 } 696 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 697 698 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 699 { 700 struct crypto_alg *alg; 701 struct crypto_tfm *tfm; 702 703 alg = crypto_spawn_alg(spawn); 704 if (IS_ERR(alg)) 705 return ERR_CAST(alg); 706 707 tfm = crypto_create_tfm(alg, spawn->frontend); 708 if (IS_ERR(tfm)) 709 goto out_put_alg; 710 711 return tfm; 712 713 out_put_alg: 714 crypto_mod_put(alg); 715 return tfm; 716 } 717 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 718 719 int crypto_register_notifier(struct notifier_block *nb) 720 { 721 return blocking_notifier_chain_register(&crypto_chain, nb); 722 } 723 EXPORT_SYMBOL_GPL(crypto_register_notifier); 724 725 int crypto_unregister_notifier(struct notifier_block *nb) 726 { 727 return blocking_notifier_chain_unregister(&crypto_chain, nb); 728 } 729 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 730 731 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 732 { 733 struct rtattr *rta = tb[0]; 734 struct crypto_attr_type *algt; 735 736 if (!rta) 737 return ERR_PTR(-ENOENT); 738 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 739 return ERR_PTR(-EINVAL); 740 if (rta->rta_type != CRYPTOA_TYPE) 741 return ERR_PTR(-EINVAL); 742 743 algt = RTA_DATA(rta); 744 745 return algt; 746 } 747 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 748 749 int crypto_check_attr_type(struct rtattr **tb, u32 type) 750 { 751 struct crypto_attr_type *algt; 752 753 algt = crypto_get_attr_type(tb); 754 if (IS_ERR(algt)) 755 return PTR_ERR(algt); 756 757 if ((algt->type ^ type) & algt->mask) 758 return -EINVAL; 759 760 return 0; 761 } 762 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 763 764 const char *crypto_attr_alg_name(struct rtattr *rta) 765 { 766 struct crypto_attr_alg *alga; 767 768 if (!rta) 769 return ERR_PTR(-ENOENT); 770 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 771 return ERR_PTR(-EINVAL); 772 if (rta->rta_type != CRYPTOA_ALG) 773 return ERR_PTR(-EINVAL); 774 775 alga = RTA_DATA(rta); 776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 777 778 return alga->name; 779 } 780 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 781 782 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, 783 const struct crypto_type *frontend, 784 u32 type, u32 mask) 785 { 786 const char *name; 787 788 name = crypto_attr_alg_name(rta); 789 if (IS_ERR(name)) 790 return ERR_CAST(name); 791 792 return crypto_find_alg(name, frontend, type, mask); 793 } 794 EXPORT_SYMBOL_GPL(crypto_attr_alg2); 795 796 int crypto_attr_u32(struct rtattr *rta, u32 *num) 797 { 798 struct crypto_attr_u32 *nu32; 799 800 if (!rta) 801 return -ENOENT; 802 if (RTA_PAYLOAD(rta) < sizeof(*nu32)) 803 return -EINVAL; 804 if (rta->rta_type != CRYPTOA_U32) 805 return -EINVAL; 806 807 nu32 = RTA_DATA(rta); 808 *num = nu32->num; 809 810 return 0; 811 } 812 EXPORT_SYMBOL_GPL(crypto_attr_u32); 813 814 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, 815 unsigned int head) 816 { 817 struct crypto_instance *inst; 818 char *p; 819 int err; 820 821 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), 822 GFP_KERNEL); 823 if (!p) 824 return ERR_PTR(-ENOMEM); 825 826 inst = (void *)(p + head); 827 828 err = -ENAMETOOLONG; 829 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 830 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 831 goto err_free_inst; 832 833 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 834 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 835 goto err_free_inst; 836 837 return p; 838 839 err_free_inst: 840 kfree(p); 841 return ERR_PTR(err); 842 } 843 EXPORT_SYMBOL_GPL(crypto_alloc_instance2); 844 845 struct crypto_instance *crypto_alloc_instance(const char *name, 846 struct crypto_alg *alg) 847 { 848 struct crypto_instance *inst; 849 struct crypto_spawn *spawn; 850 int err; 851 852 inst = crypto_alloc_instance2(name, alg, 0); 853 if (IS_ERR(inst)) 854 goto out; 855 856 spawn = crypto_instance_ctx(inst); 857 err = crypto_init_spawn(spawn, alg, inst, 858 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); 859 860 if (err) 861 goto err_free_inst; 862 863 return inst; 864 865 err_free_inst: 866 kfree(inst); 867 inst = ERR_PTR(err); 868 869 out: 870 return inst; 871 } 872 EXPORT_SYMBOL_GPL(crypto_alloc_instance); 873 874 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 875 { 876 INIT_LIST_HEAD(&queue->list); 877 queue->backlog = &queue->list; 878 queue->qlen = 0; 879 queue->max_qlen = max_qlen; 880 } 881 EXPORT_SYMBOL_GPL(crypto_init_queue); 882 883 int crypto_enqueue_request(struct crypto_queue *queue, 884 struct crypto_async_request *request) 885 { 886 int err = -EINPROGRESS; 887 888 if (unlikely(queue->qlen >= queue->max_qlen)) { 889 err = -EBUSY; 890 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) 891 goto out; 892 if (queue->backlog == &queue->list) 893 queue->backlog = &request->list; 894 } 895 896 queue->qlen++; 897 list_add_tail(&request->list, &queue->list); 898 899 out: 900 return err; 901 } 902 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 903 904 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 905 { 906 struct list_head *request; 907 908 if (unlikely(!queue->qlen)) 909 return NULL; 910 911 queue->qlen--; 912 913 if (queue->backlog != &queue->list) 914 queue->backlog = queue->backlog->next; 915 916 request = queue->list.next; 917 list_del(request); 918 919 return list_entry(request, struct crypto_async_request, list); 920 } 921 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 922 923 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) 924 { 925 struct crypto_async_request *req; 926 927 list_for_each_entry(req, &queue->list, list) { 928 if (req->tfm == tfm) 929 return 1; 930 } 931 932 return 0; 933 } 934 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); 935 936 static inline void crypto_inc_byte(u8 *a, unsigned int size) 937 { 938 u8 *b = (a + size); 939 u8 c; 940 941 for (; size; size--) { 942 c = *--b + 1; 943 *b = c; 944 if (c) 945 break; 946 } 947 } 948 949 void crypto_inc(u8 *a, unsigned int size) 950 { 951 __be32 *b = (__be32 *)(a + size); 952 u32 c; 953 954 for (; size >= 4; size -= 4) { 955 c = be32_to_cpu(*--b) + 1; 956 *b = cpu_to_be32(c); 957 if (c) 958 return; 959 } 960 961 crypto_inc_byte(a, size); 962 } 963 EXPORT_SYMBOL_GPL(crypto_inc); 964 965 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) 966 { 967 for (; size; size--) 968 *a++ ^= *b++; 969 } 970 971 void crypto_xor(u8 *dst, const u8 *src, unsigned int size) 972 { 973 u32 *a = (u32 *)dst; 974 u32 *b = (u32 *)src; 975 976 for (; size >= 4; size -= 4) 977 *a++ ^= *b++; 978 979 crypto_xor_byte((u8 *)a, (u8 *)b, size); 980 } 981 EXPORT_SYMBOL_GPL(crypto_xor); 982 983 unsigned int crypto_alg_extsize(struct crypto_alg *alg) 984 { 985 return alg->cra_ctxsize + 986 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); 987 } 988 EXPORT_SYMBOL_GPL(crypto_alg_extsize); 989 990 static int __init crypto_algapi_init(void) 991 { 992 crypto_init_proc(); 993 return 0; 994 } 995 996 static void __exit crypto_algapi_exit(void) 997 { 998 crypto_exit_proc(); 999 } 1000 1001 module_init(crypto_algapi_init); 1002 module_exit(crypto_algapi_exit); 1003 1004 MODULE_LICENSE("GPL"); 1005 MODULE_DESCRIPTION("Cryptographic algorithms API"); 1006