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 if (list_empty(stack)) 97 return NULL; 98 99 spawn = list_first_entry(stack, struct crypto_spawn, list); 100 n = list_entry(spawn->list.next, struct crypto_spawn, list); 101 102 if (spawn->alg && &n->list != stack && !n->alg) 103 n->alg = (n->list.next == stack) ? alg : 104 &list_entry(n->list.next, struct crypto_spawn, 105 list)->inst->alg; 106 107 list_move(&spawn->list, secondary_spawns); 108 109 return &n->list == stack ? top : &n->inst->alg.cra_users; 110 } 111 112 static void crypto_remove_instance(struct crypto_instance *inst, 113 struct list_head *list) 114 { 115 struct crypto_template *tmpl = inst->tmpl; 116 117 if (crypto_is_dead(&inst->alg)) 118 return; 119 120 inst->alg.cra_flags |= CRYPTO_ALG_DEAD; 121 if (hlist_unhashed(&inst->list)) 122 return; 123 124 if (!tmpl || !crypto_tmpl_get(tmpl)) 125 return; 126 127 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); 128 list_move(&inst->alg.cra_list, list); 129 hlist_del(&inst->list); 130 inst->alg.cra_destroy = crypto_destroy_instance; 131 132 BUG_ON(!list_empty(&inst->alg.cra_users)); 133 } 134 135 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, 136 struct crypto_alg *nalg) 137 { 138 u32 new_type = (nalg ?: alg)->cra_flags; 139 struct crypto_spawn *spawn, *n; 140 LIST_HEAD(secondary_spawns); 141 struct list_head *spawns; 142 LIST_HEAD(stack); 143 LIST_HEAD(top); 144 145 spawns = &alg->cra_users; 146 list_for_each_entry_safe(spawn, n, spawns, list) { 147 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) 148 continue; 149 150 list_move(&spawn->list, &top); 151 } 152 153 spawns = ⊤ 154 do { 155 while (!list_empty(spawns)) { 156 struct crypto_instance *inst; 157 158 spawn = list_first_entry(spawns, struct crypto_spawn, 159 list); 160 inst = spawn->inst; 161 162 BUG_ON(&inst->alg == alg); 163 164 list_move(&spawn->list, &stack); 165 166 if (&inst->alg == nalg) 167 break; 168 169 spawn->alg = NULL; 170 spawns = &inst->alg.cra_users; 171 } 172 } while ((spawns = crypto_more_spawns(alg, &stack, &top, 173 &secondary_spawns))); 174 175 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { 176 if (spawn->alg) 177 list_move(&spawn->list, &spawn->alg->cra_users); 178 else 179 crypto_remove_instance(spawn->inst, list); 180 } 181 } 182 EXPORT_SYMBOL_GPL(crypto_remove_spawns); 183 184 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) 185 { 186 struct crypto_alg *q; 187 struct crypto_larval *larval; 188 int ret = -EAGAIN; 189 190 if (crypto_is_dead(alg)) 191 goto err; 192 193 INIT_LIST_HEAD(&alg->cra_users); 194 195 /* No cheating! */ 196 alg->cra_flags &= ~CRYPTO_ALG_TESTED; 197 198 ret = -EEXIST; 199 200 list_for_each_entry(q, &crypto_alg_list, cra_list) { 201 if (q == alg) 202 goto err; 203 204 if (crypto_is_moribund(q)) 205 continue; 206 207 if (crypto_is_larval(q)) { 208 if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) 209 goto err; 210 continue; 211 } 212 213 if (!strcmp(q->cra_driver_name, alg->cra_name) || 214 !strcmp(q->cra_name, alg->cra_driver_name)) 215 goto err; 216 } 217 218 larval = crypto_larval_alloc(alg->cra_name, 219 alg->cra_flags | CRYPTO_ALG_TESTED, 0); 220 if (IS_ERR(larval)) 221 goto out; 222 223 ret = -ENOENT; 224 larval->adult = crypto_mod_get(alg); 225 if (!larval->adult) 226 goto free_larval; 227 228 atomic_set(&larval->alg.cra_refcnt, 1); 229 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, 230 CRYPTO_MAX_ALG_NAME); 231 larval->alg.cra_priority = alg->cra_priority; 232 233 list_add(&alg->cra_list, &crypto_alg_list); 234 list_add(&larval->alg.cra_list, &crypto_alg_list); 235 236 out: 237 return larval; 238 239 free_larval: 240 kfree(larval); 241 err: 242 larval = ERR_PTR(ret); 243 goto out; 244 } 245 246 void crypto_alg_tested(const char *name, int err) 247 { 248 struct crypto_larval *test; 249 struct crypto_alg *alg; 250 struct crypto_alg *q; 251 LIST_HEAD(list); 252 253 down_write(&crypto_alg_sem); 254 list_for_each_entry(q, &crypto_alg_list, cra_list) { 255 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 256 continue; 257 258 test = (struct crypto_larval *)q; 259 260 if (!strcmp(q->cra_driver_name, name)) 261 goto found; 262 } 263 264 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); 265 goto unlock; 266 267 found: 268 q->cra_flags |= CRYPTO_ALG_DEAD; 269 alg = test->adult; 270 if (err || list_empty(&alg->cra_list)) 271 goto complete; 272 273 alg->cra_flags |= CRYPTO_ALG_TESTED; 274 275 list_for_each_entry(q, &crypto_alg_list, cra_list) { 276 if (q == alg) 277 continue; 278 279 if (crypto_is_moribund(q)) 280 continue; 281 282 if (crypto_is_larval(q)) { 283 struct crypto_larval *larval = (void *)q; 284 285 /* 286 * Check to see if either our generic name or 287 * specific name can satisfy the name requested 288 * by the larval entry q. 289 */ 290 if (strcmp(alg->cra_name, q->cra_name) && 291 strcmp(alg->cra_driver_name, q->cra_name)) 292 continue; 293 294 if (larval->adult) 295 continue; 296 if ((q->cra_flags ^ alg->cra_flags) & larval->mask) 297 continue; 298 if (!crypto_mod_get(alg)) 299 continue; 300 301 larval->adult = alg; 302 continue; 303 } 304 305 if (strcmp(alg->cra_name, q->cra_name)) 306 continue; 307 308 if (strcmp(alg->cra_driver_name, q->cra_driver_name) && 309 q->cra_priority > alg->cra_priority) 310 continue; 311 312 crypto_remove_spawns(q, &list, alg); 313 } 314 315 complete: 316 complete_all(&test->completion); 317 318 unlock: 319 up_write(&crypto_alg_sem); 320 321 crypto_remove_final(&list); 322 } 323 EXPORT_SYMBOL_GPL(crypto_alg_tested); 324 325 void crypto_remove_final(struct list_head *list) 326 { 327 struct crypto_alg *alg; 328 struct crypto_alg *n; 329 330 list_for_each_entry_safe(alg, n, list, cra_list) { 331 list_del_init(&alg->cra_list); 332 crypto_alg_put(alg); 333 } 334 } 335 EXPORT_SYMBOL_GPL(crypto_remove_final); 336 337 static void crypto_wait_for_test(struct crypto_larval *larval) 338 { 339 int err; 340 341 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); 342 if (err != NOTIFY_STOP) { 343 if (WARN_ON(err != NOTIFY_DONE)) 344 goto out; 345 crypto_alg_tested(larval->alg.cra_driver_name, 0); 346 } 347 348 err = wait_for_completion_killable(&larval->completion); 349 WARN_ON(err); 350 351 out: 352 crypto_larval_kill(&larval->alg); 353 } 354 355 int crypto_register_alg(struct crypto_alg *alg) 356 { 357 struct crypto_larval *larval; 358 int err; 359 360 err = crypto_check_alg(alg); 361 if (err) 362 return err; 363 364 down_write(&crypto_alg_sem); 365 larval = __crypto_register_alg(alg); 366 up_write(&crypto_alg_sem); 367 368 if (IS_ERR(larval)) 369 return PTR_ERR(larval); 370 371 crypto_wait_for_test(larval); 372 return 0; 373 } 374 EXPORT_SYMBOL_GPL(crypto_register_alg); 375 376 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) 377 { 378 if (unlikely(list_empty(&alg->cra_list))) 379 return -ENOENT; 380 381 alg->cra_flags |= CRYPTO_ALG_DEAD; 382 383 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); 384 list_del_init(&alg->cra_list); 385 crypto_remove_spawns(alg, list, NULL); 386 387 return 0; 388 } 389 390 int crypto_unregister_alg(struct crypto_alg *alg) 391 { 392 int ret; 393 LIST_HEAD(list); 394 395 down_write(&crypto_alg_sem); 396 ret = crypto_remove_alg(alg, &list); 397 up_write(&crypto_alg_sem); 398 399 if (ret) 400 return ret; 401 402 BUG_ON(atomic_read(&alg->cra_refcnt) != 1); 403 if (alg->cra_destroy) 404 alg->cra_destroy(alg); 405 406 crypto_remove_final(&list); 407 return 0; 408 } 409 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 410 411 int crypto_register_algs(struct crypto_alg *algs, int count) 412 { 413 int i, ret; 414 415 for (i = 0; i < count; i++) { 416 ret = crypto_register_alg(&algs[i]); 417 if (ret) 418 goto err; 419 } 420 421 return 0; 422 423 err: 424 for (--i; i >= 0; --i) 425 crypto_unregister_alg(&algs[i]); 426 427 return ret; 428 } 429 EXPORT_SYMBOL_GPL(crypto_register_algs); 430 431 int crypto_unregister_algs(struct crypto_alg *algs, int count) 432 { 433 int i, ret; 434 435 for (i = 0; i < count; i++) { 436 ret = crypto_unregister_alg(&algs[i]); 437 if (ret) 438 pr_err("Failed to unregister %s %s: %d\n", 439 algs[i].cra_driver_name, algs[i].cra_name, ret); 440 } 441 442 return 0; 443 } 444 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 445 446 int crypto_register_template(struct crypto_template *tmpl) 447 { 448 struct crypto_template *q; 449 int err = -EEXIST; 450 451 down_write(&crypto_alg_sem); 452 453 crypto_check_module_sig(tmpl->module); 454 455 list_for_each_entry(q, &crypto_template_list, list) { 456 if (q == tmpl) 457 goto out; 458 } 459 460 list_add(&tmpl->list, &crypto_template_list); 461 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); 462 err = 0; 463 out: 464 up_write(&crypto_alg_sem); 465 return err; 466 } 467 EXPORT_SYMBOL_GPL(crypto_register_template); 468 469 void crypto_unregister_template(struct crypto_template *tmpl) 470 { 471 struct crypto_instance *inst; 472 struct hlist_node *n; 473 struct hlist_head *list; 474 LIST_HEAD(users); 475 476 down_write(&crypto_alg_sem); 477 478 BUG_ON(list_empty(&tmpl->list)); 479 list_del_init(&tmpl->list); 480 481 list = &tmpl->instances; 482 hlist_for_each_entry(inst, list, list) { 483 int err = crypto_remove_alg(&inst->alg, &users); 484 485 BUG_ON(err); 486 } 487 488 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); 489 490 up_write(&crypto_alg_sem); 491 492 hlist_for_each_entry_safe(inst, n, list, list) { 493 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); 494 crypto_free_instance(inst); 495 } 496 crypto_remove_final(&users); 497 } 498 EXPORT_SYMBOL_GPL(crypto_unregister_template); 499 500 static struct crypto_template *__crypto_lookup_template(const char *name) 501 { 502 struct crypto_template *q, *tmpl = NULL; 503 504 down_read(&crypto_alg_sem); 505 list_for_each_entry(q, &crypto_template_list, list) { 506 if (strcmp(q->name, name)) 507 continue; 508 if (unlikely(!crypto_tmpl_get(q))) 509 continue; 510 511 tmpl = q; 512 break; 513 } 514 up_read(&crypto_alg_sem); 515 516 return tmpl; 517 } 518 519 struct crypto_template *crypto_lookup_template(const char *name) 520 { 521 return try_then_request_module(__crypto_lookup_template(name), 522 "crypto-%s", name); 523 } 524 EXPORT_SYMBOL_GPL(crypto_lookup_template); 525 526 int crypto_register_instance(struct crypto_template *tmpl, 527 struct crypto_instance *inst) 528 { 529 struct crypto_larval *larval; 530 int err; 531 532 err = crypto_check_alg(&inst->alg); 533 if (err) 534 return err; 535 536 inst->alg.cra_module = tmpl->module; 537 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 538 539 if (unlikely(!crypto_mod_get(&inst->alg))) 540 return -EAGAIN; 541 542 down_write(&crypto_alg_sem); 543 544 larval = __crypto_register_alg(&inst->alg); 545 if (IS_ERR(larval)) 546 goto unlock; 547 548 hlist_add_head(&inst->list, &tmpl->instances); 549 inst->tmpl = tmpl; 550 551 unlock: 552 up_write(&crypto_alg_sem); 553 554 err = PTR_ERR(larval); 555 if (IS_ERR(larval)) 556 goto err; 557 558 crypto_wait_for_test(larval); 559 560 /* Remove instance if test failed */ 561 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) 562 crypto_unregister_instance(inst); 563 err = 0; 564 565 err: 566 crypto_mod_put(&inst->alg); 567 return err; 568 } 569 EXPORT_SYMBOL_GPL(crypto_register_instance); 570 571 int crypto_unregister_instance(struct crypto_instance *inst) 572 { 573 LIST_HEAD(list); 574 575 down_write(&crypto_alg_sem); 576 577 crypto_remove_spawns(&inst->alg, &list, NULL); 578 crypto_remove_instance(inst, &list); 579 580 up_write(&crypto_alg_sem); 581 582 crypto_remove_final(&list); 583 584 return 0; 585 } 586 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 587 588 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 589 struct crypto_instance *inst, u32 mask) 590 { 591 int err = -EAGAIN; 592 593 spawn->inst = inst; 594 spawn->mask = mask; 595 596 down_write(&crypto_alg_sem); 597 if (!crypto_is_moribund(alg)) { 598 list_add(&spawn->list, &alg->cra_users); 599 spawn->alg = alg; 600 err = 0; 601 } 602 up_write(&crypto_alg_sem); 603 604 return err; 605 } 606 EXPORT_SYMBOL_GPL(crypto_init_spawn); 607 608 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, 609 struct crypto_instance *inst, 610 const struct crypto_type *frontend) 611 { 612 int err = -EINVAL; 613 614 if ((alg->cra_flags ^ frontend->type) & frontend->maskset) 615 goto out; 616 617 spawn->frontend = frontend; 618 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); 619 620 out: 621 return err; 622 } 623 EXPORT_SYMBOL_GPL(crypto_init_spawn2); 624 625 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, 626 u32 type, u32 mask) 627 { 628 struct crypto_alg *alg; 629 int err; 630 631 alg = crypto_find_alg(name, spawn->frontend, type, mask); 632 if (IS_ERR(alg)) 633 return PTR_ERR(alg); 634 635 err = crypto_init_spawn(spawn, alg, spawn->inst, mask); 636 crypto_mod_put(alg); 637 return err; 638 } 639 EXPORT_SYMBOL_GPL(crypto_grab_spawn); 640 641 void crypto_drop_spawn(struct crypto_spawn *spawn) 642 { 643 if (!spawn->alg) 644 return; 645 646 down_write(&crypto_alg_sem); 647 list_del(&spawn->list); 648 up_write(&crypto_alg_sem); 649 } 650 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 651 652 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 653 { 654 struct crypto_alg *alg; 655 struct crypto_alg *alg2; 656 657 down_read(&crypto_alg_sem); 658 alg = spawn->alg; 659 alg2 = alg; 660 if (alg2) 661 alg2 = crypto_mod_get(alg2); 662 up_read(&crypto_alg_sem); 663 664 if (!alg2) { 665 if (alg) 666 crypto_shoot_alg(alg); 667 return ERR_PTR(-EAGAIN); 668 } 669 670 return alg; 671 } 672 673 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 674 u32 mask) 675 { 676 struct crypto_alg *alg; 677 struct crypto_tfm *tfm; 678 679 alg = crypto_spawn_alg(spawn); 680 if (IS_ERR(alg)) 681 return ERR_CAST(alg); 682 683 tfm = ERR_PTR(-EINVAL); 684 if (unlikely((alg->cra_flags ^ type) & mask)) 685 goto out_put_alg; 686 687 tfm = __crypto_alloc_tfm(alg, type, mask); 688 if (IS_ERR(tfm)) 689 goto out_put_alg; 690 691 return tfm; 692 693 out_put_alg: 694 crypto_mod_put(alg); 695 return tfm; 696 } 697 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 698 699 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 700 { 701 struct crypto_alg *alg; 702 struct crypto_tfm *tfm; 703 704 alg = crypto_spawn_alg(spawn); 705 if (IS_ERR(alg)) 706 return ERR_CAST(alg); 707 708 tfm = crypto_create_tfm(alg, spawn->frontend); 709 if (IS_ERR(tfm)) 710 goto out_put_alg; 711 712 return tfm; 713 714 out_put_alg: 715 crypto_mod_put(alg); 716 return tfm; 717 } 718 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 719 720 int crypto_register_notifier(struct notifier_block *nb) 721 { 722 return blocking_notifier_chain_register(&crypto_chain, nb); 723 } 724 EXPORT_SYMBOL_GPL(crypto_register_notifier); 725 726 int crypto_unregister_notifier(struct notifier_block *nb) 727 { 728 return blocking_notifier_chain_unregister(&crypto_chain, nb); 729 } 730 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 731 732 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 733 { 734 struct rtattr *rta = tb[0]; 735 struct crypto_attr_type *algt; 736 737 if (!rta) 738 return ERR_PTR(-ENOENT); 739 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 740 return ERR_PTR(-EINVAL); 741 if (rta->rta_type != CRYPTOA_TYPE) 742 return ERR_PTR(-EINVAL); 743 744 algt = RTA_DATA(rta); 745 746 return algt; 747 } 748 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 749 750 int crypto_check_attr_type(struct rtattr **tb, u32 type) 751 { 752 struct crypto_attr_type *algt; 753 754 algt = crypto_get_attr_type(tb); 755 if (IS_ERR(algt)) 756 return PTR_ERR(algt); 757 758 if ((algt->type ^ type) & algt->mask) 759 return -EINVAL; 760 761 return 0; 762 } 763 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 764 765 const char *crypto_attr_alg_name(struct rtattr *rta) 766 { 767 struct crypto_attr_alg *alga; 768 769 if (!rta) 770 return ERR_PTR(-ENOENT); 771 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 772 return ERR_PTR(-EINVAL); 773 if (rta->rta_type != CRYPTOA_ALG) 774 return ERR_PTR(-EINVAL); 775 776 alga = RTA_DATA(rta); 777 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 778 779 return alga->name; 780 } 781 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 782 783 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, 784 const struct crypto_type *frontend, 785 u32 type, u32 mask) 786 { 787 const char *name; 788 789 name = crypto_attr_alg_name(rta); 790 if (IS_ERR(name)) 791 return ERR_CAST(name); 792 793 return crypto_find_alg(name, frontend, type, mask); 794 } 795 EXPORT_SYMBOL_GPL(crypto_attr_alg2); 796 797 int crypto_attr_u32(struct rtattr *rta, u32 *num) 798 { 799 struct crypto_attr_u32 *nu32; 800 801 if (!rta) 802 return -ENOENT; 803 if (RTA_PAYLOAD(rta) < sizeof(*nu32)) 804 return -EINVAL; 805 if (rta->rta_type != CRYPTOA_U32) 806 return -EINVAL; 807 808 nu32 = RTA_DATA(rta); 809 *num = nu32->num; 810 811 return 0; 812 } 813 EXPORT_SYMBOL_GPL(crypto_attr_u32); 814 815 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, 816 unsigned int head) 817 { 818 struct crypto_instance *inst; 819 char *p; 820 int err; 821 822 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), 823 GFP_KERNEL); 824 if (!p) 825 return ERR_PTR(-ENOMEM); 826 827 inst = (void *)(p + head); 828 829 err = -ENAMETOOLONG; 830 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 831 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 832 goto err_free_inst; 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 goto err_free_inst; 837 838 return p; 839 840 err_free_inst: 841 kfree(p); 842 return ERR_PTR(err); 843 } 844 EXPORT_SYMBOL_GPL(crypto_alloc_instance2); 845 846 struct crypto_instance *crypto_alloc_instance(const char *name, 847 struct crypto_alg *alg) 848 { 849 struct crypto_instance *inst; 850 struct crypto_spawn *spawn; 851 int err; 852 853 inst = crypto_alloc_instance2(name, alg, 0); 854 if (IS_ERR(inst)) 855 goto out; 856 857 spawn = crypto_instance_ctx(inst); 858 err = crypto_init_spawn(spawn, alg, inst, 859 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); 860 861 if (err) 862 goto err_free_inst; 863 864 return inst; 865 866 err_free_inst: 867 kfree(inst); 868 inst = ERR_PTR(err); 869 870 out: 871 return inst; 872 } 873 EXPORT_SYMBOL_GPL(crypto_alloc_instance); 874 875 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 876 { 877 INIT_LIST_HEAD(&queue->list); 878 queue->backlog = &queue->list; 879 queue->qlen = 0; 880 queue->max_qlen = max_qlen; 881 } 882 EXPORT_SYMBOL_GPL(crypto_init_queue); 883 884 int crypto_enqueue_request(struct crypto_queue *queue, 885 struct crypto_async_request *request) 886 { 887 int err = -EINPROGRESS; 888 889 if (unlikely(queue->qlen >= queue->max_qlen)) { 890 err = -EBUSY; 891 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) 892 goto out; 893 if (queue->backlog == &queue->list) 894 queue->backlog = &request->list; 895 } 896 897 queue->qlen++; 898 list_add_tail(&request->list, &queue->list); 899 900 out: 901 return err; 902 } 903 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 904 905 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 906 { 907 struct list_head *request; 908 909 if (unlikely(!queue->qlen)) 910 return NULL; 911 912 queue->qlen--; 913 914 if (queue->backlog != &queue->list) 915 queue->backlog = queue->backlog->next; 916 917 request = queue->list.next; 918 list_del(request); 919 920 return list_entry(request, struct crypto_async_request, list); 921 } 922 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 923 924 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) 925 { 926 struct crypto_async_request *req; 927 928 list_for_each_entry(req, &queue->list, list) { 929 if (req->tfm == tfm) 930 return 1; 931 } 932 933 return 0; 934 } 935 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); 936 937 static inline void crypto_inc_byte(u8 *a, unsigned int size) 938 { 939 u8 *b = (a + size); 940 u8 c; 941 942 for (; size; size--) { 943 c = *--b + 1; 944 *b = c; 945 if (c) 946 break; 947 } 948 } 949 950 void crypto_inc(u8 *a, unsigned int size) 951 { 952 __be32 *b = (__be32 *)(a + size); 953 u32 c; 954 955 for (; size >= 4; size -= 4) { 956 c = be32_to_cpu(*--b) + 1; 957 *b = cpu_to_be32(c); 958 if (c) 959 return; 960 } 961 962 crypto_inc_byte(a, size); 963 } 964 EXPORT_SYMBOL_GPL(crypto_inc); 965 966 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) 967 { 968 for (; size; size--) 969 *a++ ^= *b++; 970 } 971 972 void crypto_xor(u8 *dst, const u8 *src, unsigned int size) 973 { 974 u32 *a = (u32 *)dst; 975 u32 *b = (u32 *)src; 976 977 for (; size >= 4; size -= 4) 978 *a++ ^= *b++; 979 980 crypto_xor_byte((u8 *)a, (u8 *)b, size); 981 } 982 EXPORT_SYMBOL_GPL(crypto_xor); 983 984 unsigned int crypto_alg_extsize(struct crypto_alg *alg) 985 { 986 return alg->cra_ctxsize + 987 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); 988 } 989 EXPORT_SYMBOL_GPL(crypto_alg_extsize); 990 991 static int __init crypto_algapi_init(void) 992 { 993 crypto_init_proc(); 994 return 0; 995 } 996 997 static void __exit crypto_algapi_exit(void) 998 { 999 crypto_exit_proc(); 1000 } 1001 1002 module_init(crypto_algapi_init); 1003 module_exit(crypto_algapi_exit); 1004 1005 MODULE_LICENSE("GPL"); 1006 MODULE_DESCRIPTION("Cryptographic algorithms API"); 1007