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 /* 172 * We may encounter an unregistered instance here, since 173 * an instance's spawns are set up prior to the instance 174 * being registered. An unregistered instance will have 175 * NULL ->cra_users.next, since ->cra_users isn't 176 * properly initialized until registration. But an 177 * unregistered instance cannot have any users, so treat 178 * it the same as ->cra_users being empty. 179 */ 180 if (spawns->next == NULL) 181 break; 182 } 183 } while ((spawns = crypto_more_spawns(alg, &stack, &top, 184 &secondary_spawns))); 185 186 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { 187 if (spawn->alg) 188 list_move(&spawn->list, &spawn->alg->cra_users); 189 else 190 crypto_remove_instance(spawn->inst, list); 191 } 192 } 193 EXPORT_SYMBOL_GPL(crypto_remove_spawns); 194 195 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) 196 { 197 struct crypto_alg *q; 198 struct crypto_larval *larval; 199 int ret = -EAGAIN; 200 201 if (crypto_is_dead(alg)) 202 goto err; 203 204 INIT_LIST_HEAD(&alg->cra_users); 205 206 /* No cheating! */ 207 alg->cra_flags &= ~CRYPTO_ALG_TESTED; 208 209 ret = -EEXIST; 210 211 list_for_each_entry(q, &crypto_alg_list, cra_list) { 212 if (q == alg) 213 goto err; 214 215 if (crypto_is_moribund(q)) 216 continue; 217 218 if (crypto_is_larval(q)) { 219 if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) 220 goto err; 221 continue; 222 } 223 224 if (!strcmp(q->cra_driver_name, alg->cra_name) || 225 !strcmp(q->cra_name, alg->cra_driver_name)) 226 goto err; 227 } 228 229 larval = crypto_larval_alloc(alg->cra_name, 230 alg->cra_flags | CRYPTO_ALG_TESTED, 0); 231 if (IS_ERR(larval)) 232 goto out; 233 234 ret = -ENOENT; 235 larval->adult = crypto_mod_get(alg); 236 if (!larval->adult) 237 goto free_larval; 238 239 atomic_set(&larval->alg.cra_refcnt, 1); 240 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, 241 CRYPTO_MAX_ALG_NAME); 242 larval->alg.cra_priority = alg->cra_priority; 243 244 list_add(&alg->cra_list, &crypto_alg_list); 245 list_add(&larval->alg.cra_list, &crypto_alg_list); 246 247 out: 248 return larval; 249 250 free_larval: 251 kfree(larval); 252 err: 253 larval = ERR_PTR(ret); 254 goto out; 255 } 256 257 void crypto_alg_tested(const char *name, int err) 258 { 259 struct crypto_larval *test; 260 struct crypto_alg *alg; 261 struct crypto_alg *q; 262 LIST_HEAD(list); 263 264 down_write(&crypto_alg_sem); 265 list_for_each_entry(q, &crypto_alg_list, cra_list) { 266 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 267 continue; 268 269 test = (struct crypto_larval *)q; 270 271 if (!strcmp(q->cra_driver_name, name)) 272 goto found; 273 } 274 275 pr_err("alg: Unexpected test result for %s: %d\n", name, err); 276 goto unlock; 277 278 found: 279 q->cra_flags |= CRYPTO_ALG_DEAD; 280 alg = test->adult; 281 if (err || list_empty(&alg->cra_list)) 282 goto complete; 283 284 alg->cra_flags |= CRYPTO_ALG_TESTED; 285 286 list_for_each_entry(q, &crypto_alg_list, cra_list) { 287 if (q == alg) 288 continue; 289 290 if (crypto_is_moribund(q)) 291 continue; 292 293 if (crypto_is_larval(q)) { 294 struct crypto_larval *larval = (void *)q; 295 296 /* 297 * Check to see if either our generic name or 298 * specific name can satisfy the name requested 299 * by the larval entry q. 300 */ 301 if (strcmp(alg->cra_name, q->cra_name) && 302 strcmp(alg->cra_driver_name, q->cra_name)) 303 continue; 304 305 if (larval->adult) 306 continue; 307 if ((q->cra_flags ^ alg->cra_flags) & larval->mask) 308 continue; 309 if (!crypto_mod_get(alg)) 310 continue; 311 312 larval->adult = alg; 313 continue; 314 } 315 316 if (strcmp(alg->cra_name, q->cra_name)) 317 continue; 318 319 if (strcmp(alg->cra_driver_name, q->cra_driver_name) && 320 q->cra_priority > alg->cra_priority) 321 continue; 322 323 crypto_remove_spawns(q, &list, alg); 324 } 325 326 complete: 327 complete_all(&test->completion); 328 329 unlock: 330 up_write(&crypto_alg_sem); 331 332 crypto_remove_final(&list); 333 } 334 EXPORT_SYMBOL_GPL(crypto_alg_tested); 335 336 void crypto_remove_final(struct list_head *list) 337 { 338 struct crypto_alg *alg; 339 struct crypto_alg *n; 340 341 list_for_each_entry_safe(alg, n, list, cra_list) { 342 list_del_init(&alg->cra_list); 343 crypto_alg_put(alg); 344 } 345 } 346 EXPORT_SYMBOL_GPL(crypto_remove_final); 347 348 static void crypto_wait_for_test(struct crypto_larval *larval) 349 { 350 int err; 351 352 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); 353 if (err != NOTIFY_STOP) { 354 if (WARN_ON(err != NOTIFY_DONE)) 355 goto out; 356 crypto_alg_tested(larval->alg.cra_driver_name, 0); 357 } 358 359 err = wait_for_completion_killable(&larval->completion); 360 WARN_ON(err); 361 362 out: 363 crypto_larval_kill(&larval->alg); 364 } 365 366 int crypto_register_alg(struct crypto_alg *alg) 367 { 368 struct crypto_larval *larval; 369 int err; 370 371 alg->cra_flags &= ~CRYPTO_ALG_DEAD; 372 err = crypto_check_alg(alg); 373 if (err) 374 return err; 375 376 down_write(&crypto_alg_sem); 377 larval = __crypto_register_alg(alg); 378 up_write(&crypto_alg_sem); 379 380 if (IS_ERR(larval)) 381 return PTR_ERR(larval); 382 383 crypto_wait_for_test(larval); 384 return 0; 385 } 386 EXPORT_SYMBOL_GPL(crypto_register_alg); 387 388 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) 389 { 390 if (unlikely(list_empty(&alg->cra_list))) 391 return -ENOENT; 392 393 alg->cra_flags |= CRYPTO_ALG_DEAD; 394 395 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); 396 list_del_init(&alg->cra_list); 397 crypto_remove_spawns(alg, list, NULL); 398 399 return 0; 400 } 401 402 int crypto_unregister_alg(struct crypto_alg *alg) 403 { 404 int ret; 405 LIST_HEAD(list); 406 407 down_write(&crypto_alg_sem); 408 ret = crypto_remove_alg(alg, &list); 409 up_write(&crypto_alg_sem); 410 411 if (ret) 412 return ret; 413 414 BUG_ON(atomic_read(&alg->cra_refcnt) != 1); 415 if (alg->cra_destroy) 416 alg->cra_destroy(alg); 417 418 crypto_remove_final(&list); 419 return 0; 420 } 421 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 422 423 int crypto_register_algs(struct crypto_alg *algs, int count) 424 { 425 int i, ret; 426 427 for (i = 0; i < count; i++) { 428 ret = crypto_register_alg(&algs[i]); 429 if (ret) 430 goto err; 431 } 432 433 return 0; 434 435 err: 436 for (--i; i >= 0; --i) 437 crypto_unregister_alg(&algs[i]); 438 439 return ret; 440 } 441 EXPORT_SYMBOL_GPL(crypto_register_algs); 442 443 int crypto_unregister_algs(struct crypto_alg *algs, int count) 444 { 445 int i, ret; 446 447 for (i = 0; i < count; i++) { 448 ret = crypto_unregister_alg(&algs[i]); 449 if (ret) 450 pr_err("Failed to unregister %s %s: %d\n", 451 algs[i].cra_driver_name, algs[i].cra_name, ret); 452 } 453 454 return 0; 455 } 456 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 457 458 int crypto_register_template(struct crypto_template *tmpl) 459 { 460 struct crypto_template *q; 461 int err = -EEXIST; 462 463 down_write(&crypto_alg_sem); 464 465 crypto_check_module_sig(tmpl->module); 466 467 list_for_each_entry(q, &crypto_template_list, list) { 468 if (q == tmpl) 469 goto out; 470 } 471 472 list_add(&tmpl->list, &crypto_template_list); 473 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); 474 err = 0; 475 out: 476 up_write(&crypto_alg_sem); 477 return err; 478 } 479 EXPORT_SYMBOL_GPL(crypto_register_template); 480 481 void crypto_unregister_template(struct crypto_template *tmpl) 482 { 483 struct crypto_instance *inst; 484 struct hlist_node *n; 485 struct hlist_head *list; 486 LIST_HEAD(users); 487 488 down_write(&crypto_alg_sem); 489 490 BUG_ON(list_empty(&tmpl->list)); 491 list_del_init(&tmpl->list); 492 493 list = &tmpl->instances; 494 hlist_for_each_entry(inst, list, list) { 495 int err = crypto_remove_alg(&inst->alg, &users); 496 497 BUG_ON(err); 498 } 499 500 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); 501 502 up_write(&crypto_alg_sem); 503 504 hlist_for_each_entry_safe(inst, n, list, list) { 505 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); 506 crypto_free_instance(inst); 507 } 508 crypto_remove_final(&users); 509 } 510 EXPORT_SYMBOL_GPL(crypto_unregister_template); 511 512 static struct crypto_template *__crypto_lookup_template(const char *name) 513 { 514 struct crypto_template *q, *tmpl = NULL; 515 516 down_read(&crypto_alg_sem); 517 list_for_each_entry(q, &crypto_template_list, list) { 518 if (strcmp(q->name, name)) 519 continue; 520 if (unlikely(!crypto_tmpl_get(q))) 521 continue; 522 523 tmpl = q; 524 break; 525 } 526 up_read(&crypto_alg_sem); 527 528 return tmpl; 529 } 530 531 struct crypto_template *crypto_lookup_template(const char *name) 532 { 533 return try_then_request_module(__crypto_lookup_template(name), 534 "crypto-%s", name); 535 } 536 EXPORT_SYMBOL_GPL(crypto_lookup_template); 537 538 int crypto_register_instance(struct crypto_template *tmpl, 539 struct crypto_instance *inst) 540 { 541 struct crypto_larval *larval; 542 int err; 543 544 err = crypto_check_alg(&inst->alg); 545 if (err) 546 return err; 547 548 inst->alg.cra_module = tmpl->module; 549 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 550 551 if (unlikely(!crypto_mod_get(&inst->alg))) 552 return -EAGAIN; 553 554 down_write(&crypto_alg_sem); 555 556 larval = __crypto_register_alg(&inst->alg); 557 if (IS_ERR(larval)) 558 goto unlock; 559 560 hlist_add_head(&inst->list, &tmpl->instances); 561 inst->tmpl = tmpl; 562 563 unlock: 564 up_write(&crypto_alg_sem); 565 566 err = PTR_ERR(larval); 567 if (IS_ERR(larval)) 568 goto err; 569 570 crypto_wait_for_test(larval); 571 572 /* Remove instance if test failed */ 573 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) 574 crypto_unregister_instance(inst); 575 err = 0; 576 577 err: 578 crypto_mod_put(&inst->alg); 579 return err; 580 } 581 EXPORT_SYMBOL_GPL(crypto_register_instance); 582 583 int crypto_unregister_instance(struct crypto_instance *inst) 584 { 585 LIST_HEAD(list); 586 587 down_write(&crypto_alg_sem); 588 589 crypto_remove_spawns(&inst->alg, &list, NULL); 590 crypto_remove_instance(inst, &list); 591 592 up_write(&crypto_alg_sem); 593 594 crypto_remove_final(&list); 595 596 return 0; 597 } 598 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 599 600 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 601 struct crypto_instance *inst, u32 mask) 602 { 603 int err = -EAGAIN; 604 605 spawn->inst = inst; 606 spawn->mask = mask; 607 608 down_write(&crypto_alg_sem); 609 if (!crypto_is_moribund(alg)) { 610 list_add(&spawn->list, &alg->cra_users); 611 spawn->alg = alg; 612 err = 0; 613 } 614 up_write(&crypto_alg_sem); 615 616 return err; 617 } 618 EXPORT_SYMBOL_GPL(crypto_init_spawn); 619 620 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, 621 struct crypto_instance *inst, 622 const struct crypto_type *frontend) 623 { 624 int err = -EINVAL; 625 626 if ((alg->cra_flags ^ frontend->type) & frontend->maskset) 627 goto out; 628 629 spawn->frontend = frontend; 630 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); 631 632 out: 633 return err; 634 } 635 EXPORT_SYMBOL_GPL(crypto_init_spawn2); 636 637 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, 638 u32 type, u32 mask) 639 { 640 struct crypto_alg *alg; 641 int err; 642 643 alg = crypto_find_alg(name, spawn->frontend, type, mask); 644 if (IS_ERR(alg)) 645 return PTR_ERR(alg); 646 647 err = crypto_init_spawn(spawn, alg, spawn->inst, mask); 648 crypto_mod_put(alg); 649 return err; 650 } 651 EXPORT_SYMBOL_GPL(crypto_grab_spawn); 652 653 void crypto_drop_spawn(struct crypto_spawn *spawn) 654 { 655 if (!spawn->alg) 656 return; 657 658 down_write(&crypto_alg_sem); 659 list_del(&spawn->list); 660 up_write(&crypto_alg_sem); 661 } 662 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 663 664 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 665 { 666 struct crypto_alg *alg; 667 struct crypto_alg *alg2; 668 669 down_read(&crypto_alg_sem); 670 alg = spawn->alg; 671 alg2 = alg; 672 if (alg2) 673 alg2 = crypto_mod_get(alg2); 674 up_read(&crypto_alg_sem); 675 676 if (!alg2) { 677 if (alg) 678 crypto_shoot_alg(alg); 679 return ERR_PTR(-EAGAIN); 680 } 681 682 return alg; 683 } 684 685 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 686 u32 mask) 687 { 688 struct crypto_alg *alg; 689 struct crypto_tfm *tfm; 690 691 alg = crypto_spawn_alg(spawn); 692 if (IS_ERR(alg)) 693 return ERR_CAST(alg); 694 695 tfm = ERR_PTR(-EINVAL); 696 if (unlikely((alg->cra_flags ^ type) & mask)) 697 goto out_put_alg; 698 699 tfm = __crypto_alloc_tfm(alg, type, mask); 700 if (IS_ERR(tfm)) 701 goto out_put_alg; 702 703 return tfm; 704 705 out_put_alg: 706 crypto_mod_put(alg); 707 return tfm; 708 } 709 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 710 711 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 712 { 713 struct crypto_alg *alg; 714 struct crypto_tfm *tfm; 715 716 alg = crypto_spawn_alg(spawn); 717 if (IS_ERR(alg)) 718 return ERR_CAST(alg); 719 720 tfm = crypto_create_tfm(alg, spawn->frontend); 721 if (IS_ERR(tfm)) 722 goto out_put_alg; 723 724 return tfm; 725 726 out_put_alg: 727 crypto_mod_put(alg); 728 return tfm; 729 } 730 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 731 732 int crypto_register_notifier(struct notifier_block *nb) 733 { 734 return blocking_notifier_chain_register(&crypto_chain, nb); 735 } 736 EXPORT_SYMBOL_GPL(crypto_register_notifier); 737 738 int crypto_unregister_notifier(struct notifier_block *nb) 739 { 740 return blocking_notifier_chain_unregister(&crypto_chain, nb); 741 } 742 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 743 744 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 745 { 746 struct rtattr *rta = tb[0]; 747 struct crypto_attr_type *algt; 748 749 if (!rta) 750 return ERR_PTR(-ENOENT); 751 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 752 return ERR_PTR(-EINVAL); 753 if (rta->rta_type != CRYPTOA_TYPE) 754 return ERR_PTR(-EINVAL); 755 756 algt = RTA_DATA(rta); 757 758 return algt; 759 } 760 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 761 762 int crypto_check_attr_type(struct rtattr **tb, u32 type) 763 { 764 struct crypto_attr_type *algt; 765 766 algt = crypto_get_attr_type(tb); 767 if (IS_ERR(algt)) 768 return PTR_ERR(algt); 769 770 if ((algt->type ^ type) & algt->mask) 771 return -EINVAL; 772 773 return 0; 774 } 775 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 776 777 const char *crypto_attr_alg_name(struct rtattr *rta) 778 { 779 struct crypto_attr_alg *alga; 780 781 if (!rta) 782 return ERR_PTR(-ENOENT); 783 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 784 return ERR_PTR(-EINVAL); 785 if (rta->rta_type != CRYPTOA_ALG) 786 return ERR_PTR(-EINVAL); 787 788 alga = RTA_DATA(rta); 789 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 790 791 return alga->name; 792 } 793 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 794 795 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, 796 const struct crypto_type *frontend, 797 u32 type, u32 mask) 798 { 799 const char *name; 800 801 name = crypto_attr_alg_name(rta); 802 if (IS_ERR(name)) 803 return ERR_CAST(name); 804 805 return crypto_find_alg(name, frontend, type, mask); 806 } 807 EXPORT_SYMBOL_GPL(crypto_attr_alg2); 808 809 int crypto_attr_u32(struct rtattr *rta, u32 *num) 810 { 811 struct crypto_attr_u32 *nu32; 812 813 if (!rta) 814 return -ENOENT; 815 if (RTA_PAYLOAD(rta) < sizeof(*nu32)) 816 return -EINVAL; 817 if (rta->rta_type != CRYPTOA_U32) 818 return -EINVAL; 819 820 nu32 = RTA_DATA(rta); 821 *num = nu32->num; 822 823 return 0; 824 } 825 EXPORT_SYMBOL_GPL(crypto_attr_u32); 826 827 int crypto_inst_setname(struct crypto_instance *inst, const char *name, 828 struct crypto_alg *alg) 829 { 830 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 831 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 832 return -ENAMETOOLONG; 833 834 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 835 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 836 return -ENAMETOOLONG; 837 838 return 0; 839 } 840 EXPORT_SYMBOL_GPL(crypto_inst_setname); 841 842 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, 843 unsigned int head) 844 { 845 struct crypto_instance *inst; 846 char *p; 847 int err; 848 849 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), 850 GFP_KERNEL); 851 if (!p) 852 return ERR_PTR(-ENOMEM); 853 854 inst = (void *)(p + head); 855 856 err = crypto_inst_setname(inst, name, alg); 857 if (err) 858 goto err_free_inst; 859 860 return p; 861 862 err_free_inst: 863 kfree(p); 864 return ERR_PTR(err); 865 } 866 EXPORT_SYMBOL_GPL(crypto_alloc_instance2); 867 868 struct crypto_instance *crypto_alloc_instance(const char *name, 869 struct crypto_alg *alg) 870 { 871 struct crypto_instance *inst; 872 struct crypto_spawn *spawn; 873 int err; 874 875 inst = crypto_alloc_instance2(name, alg, 0); 876 if (IS_ERR(inst)) 877 goto out; 878 879 spawn = crypto_instance_ctx(inst); 880 err = crypto_init_spawn(spawn, alg, inst, 881 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); 882 883 if (err) 884 goto err_free_inst; 885 886 return inst; 887 888 err_free_inst: 889 kfree(inst); 890 inst = ERR_PTR(err); 891 892 out: 893 return inst; 894 } 895 EXPORT_SYMBOL_GPL(crypto_alloc_instance); 896 897 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 898 { 899 INIT_LIST_HEAD(&queue->list); 900 queue->backlog = &queue->list; 901 queue->qlen = 0; 902 queue->max_qlen = max_qlen; 903 } 904 EXPORT_SYMBOL_GPL(crypto_init_queue); 905 906 int crypto_enqueue_request(struct crypto_queue *queue, 907 struct crypto_async_request *request) 908 { 909 int err = -EINPROGRESS; 910 911 if (unlikely(queue->qlen >= queue->max_qlen)) { 912 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) { 913 err = -ENOSPC; 914 goto out; 915 } 916 err = -EBUSY; 917 if (queue->backlog == &queue->list) 918 queue->backlog = &request->list; 919 } 920 921 queue->qlen++; 922 list_add_tail(&request->list, &queue->list); 923 924 out: 925 return err; 926 } 927 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 928 929 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 930 { 931 struct list_head *request; 932 933 if (unlikely(!queue->qlen)) 934 return NULL; 935 936 queue->qlen--; 937 938 if (queue->backlog != &queue->list) 939 queue->backlog = queue->backlog->next; 940 941 request = queue->list.next; 942 list_del(request); 943 944 return list_entry(request, struct crypto_async_request, list); 945 } 946 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 947 948 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) 949 { 950 struct crypto_async_request *req; 951 952 list_for_each_entry(req, &queue->list, list) { 953 if (req->tfm == tfm) 954 return 1; 955 } 956 957 return 0; 958 } 959 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); 960 961 static inline void crypto_inc_byte(u8 *a, unsigned int size) 962 { 963 u8 *b = (a + size); 964 u8 c; 965 966 for (; size; size--) { 967 c = *--b + 1; 968 *b = c; 969 if (c) 970 break; 971 } 972 } 973 974 void crypto_inc(u8 *a, unsigned int size) 975 { 976 __be32 *b = (__be32 *)(a + size); 977 u32 c; 978 979 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || 980 IS_ALIGNED((unsigned long)b, __alignof__(*b))) 981 for (; size >= 4; size -= 4) { 982 c = be32_to_cpu(*--b) + 1; 983 *b = cpu_to_be32(c); 984 if (likely(c)) 985 return; 986 } 987 988 crypto_inc_byte(a, size); 989 } 990 EXPORT_SYMBOL_GPL(crypto_inc); 991 992 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len) 993 { 994 int relalign = 0; 995 996 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) { 997 int size = sizeof(unsigned long); 998 int d = (((unsigned long)dst ^ (unsigned long)src1) | 999 ((unsigned long)dst ^ (unsigned long)src2)) & 1000 (size - 1); 1001 1002 relalign = d ? 1 << __ffs(d) : size; 1003 1004 /* 1005 * If we care about alignment, process as many bytes as 1006 * needed to advance dst and src to values whose alignments 1007 * equal their relative alignment. This will allow us to 1008 * process the remainder of the input using optimal strides. 1009 */ 1010 while (((unsigned long)dst & (relalign - 1)) && len > 0) { 1011 *dst++ = *src1++ ^ *src2++; 1012 len--; 1013 } 1014 } 1015 1016 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) { 1017 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2; 1018 dst += 8; 1019 src1 += 8; 1020 src2 += 8; 1021 len -= 8; 1022 } 1023 1024 while (len >= 4 && !(relalign & 3)) { 1025 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2; 1026 dst += 4; 1027 src1 += 4; 1028 src2 += 4; 1029 len -= 4; 1030 } 1031 1032 while (len >= 2 && !(relalign & 1)) { 1033 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2; 1034 dst += 2; 1035 src1 += 2; 1036 src2 += 2; 1037 len -= 2; 1038 } 1039 1040 while (len--) 1041 *dst++ = *src1++ ^ *src2++; 1042 } 1043 EXPORT_SYMBOL_GPL(__crypto_xor); 1044 1045 unsigned int crypto_alg_extsize(struct crypto_alg *alg) 1046 { 1047 return alg->cra_ctxsize + 1048 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); 1049 } 1050 EXPORT_SYMBOL_GPL(crypto_alg_extsize); 1051 1052 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend, 1053 u32 type, u32 mask) 1054 { 1055 int ret = 0; 1056 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask); 1057 1058 if (!IS_ERR(alg)) { 1059 crypto_mod_put(alg); 1060 ret = 1; 1061 } 1062 1063 return ret; 1064 } 1065 EXPORT_SYMBOL_GPL(crypto_type_has_alg); 1066 1067 static int __init crypto_algapi_init(void) 1068 { 1069 crypto_init_proc(); 1070 return 0; 1071 } 1072 1073 static void __exit crypto_algapi_exit(void) 1074 { 1075 crypto_exit_proc(); 1076 } 1077 1078 module_init(crypto_algapi_init); 1079 module_exit(crypto_algapi_exit); 1080 1081 MODULE_LICENSE("GPL"); 1082 MODULE_DESCRIPTION("Cryptographic algorithms API"); 1083