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_destroy_instance(struct crypto_alg *alg) 71 { 72 struct crypto_instance *inst = (void *)alg; 73 struct crypto_template *tmpl = inst->tmpl; 74 75 tmpl->free(inst); 76 crypto_tmpl_put(tmpl); 77 } 78 79 static struct list_head *crypto_more_spawns(struct crypto_alg *alg, 80 struct list_head *stack, 81 struct list_head *top, 82 struct list_head *secondary_spawns) 83 { 84 struct crypto_spawn *spawn, *n; 85 86 if (list_empty(stack)) 87 return NULL; 88 89 spawn = list_first_entry(stack, struct crypto_spawn, list); 90 n = list_entry(spawn->list.next, struct crypto_spawn, list); 91 92 if (spawn->alg && &n->list != stack && !n->alg) 93 n->alg = (n->list.next == stack) ? alg : 94 &list_entry(n->list.next, struct crypto_spawn, 95 list)->inst->alg; 96 97 list_move(&spawn->list, secondary_spawns); 98 99 return &n->list == stack ? top : &n->inst->alg.cra_users; 100 } 101 102 static void crypto_remove_instance(struct crypto_instance *inst, 103 struct list_head *list) 104 { 105 struct crypto_template *tmpl = inst->tmpl; 106 107 if (crypto_is_dead(&inst->alg)) 108 return; 109 110 inst->alg.cra_flags |= CRYPTO_ALG_DEAD; 111 if (hlist_unhashed(&inst->list)) 112 return; 113 114 if (!tmpl || !crypto_tmpl_get(tmpl)) 115 return; 116 117 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); 118 list_move(&inst->alg.cra_list, list); 119 hlist_del(&inst->list); 120 inst->alg.cra_destroy = crypto_destroy_instance; 121 122 BUG_ON(!list_empty(&inst->alg.cra_users)); 123 } 124 125 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, 126 struct crypto_alg *nalg) 127 { 128 u32 new_type = (nalg ?: alg)->cra_flags; 129 struct crypto_spawn *spawn, *n; 130 LIST_HEAD(secondary_spawns); 131 struct list_head *spawns; 132 LIST_HEAD(stack); 133 LIST_HEAD(top); 134 135 spawns = &alg->cra_users; 136 list_for_each_entry_safe(spawn, n, spawns, list) { 137 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) 138 continue; 139 140 list_move(&spawn->list, &top); 141 } 142 143 spawns = ⊤ 144 do { 145 while (!list_empty(spawns)) { 146 struct crypto_instance *inst; 147 148 spawn = list_first_entry(spawns, struct crypto_spawn, 149 list); 150 inst = spawn->inst; 151 152 BUG_ON(&inst->alg == alg); 153 154 list_move(&spawn->list, &stack); 155 156 if (&inst->alg == nalg) 157 break; 158 159 spawn->alg = NULL; 160 spawns = &inst->alg.cra_users; 161 } 162 } while ((spawns = crypto_more_spawns(alg, &stack, &top, 163 &secondary_spawns))); 164 165 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { 166 if (spawn->alg) 167 list_move(&spawn->list, &spawn->alg->cra_users); 168 else 169 crypto_remove_instance(spawn->inst, list); 170 } 171 } 172 EXPORT_SYMBOL_GPL(crypto_remove_spawns); 173 174 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) 175 { 176 struct crypto_alg *q; 177 struct crypto_larval *larval; 178 int ret = -EAGAIN; 179 180 if (crypto_is_dead(alg)) 181 goto err; 182 183 INIT_LIST_HEAD(&alg->cra_users); 184 185 /* No cheating! */ 186 alg->cra_flags &= ~CRYPTO_ALG_TESTED; 187 188 ret = -EEXIST; 189 190 list_for_each_entry(q, &crypto_alg_list, cra_list) { 191 if (q == alg) 192 goto err; 193 194 if (crypto_is_moribund(q)) 195 continue; 196 197 if (crypto_is_larval(q)) { 198 if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) 199 goto err; 200 continue; 201 } 202 203 if (!strcmp(q->cra_driver_name, alg->cra_name) || 204 !strcmp(q->cra_name, alg->cra_driver_name)) 205 goto err; 206 } 207 208 larval = crypto_larval_alloc(alg->cra_name, 209 alg->cra_flags | CRYPTO_ALG_TESTED, 0); 210 if (IS_ERR(larval)) 211 goto out; 212 213 ret = -ENOENT; 214 larval->adult = crypto_mod_get(alg); 215 if (!larval->adult) 216 goto free_larval; 217 218 atomic_set(&larval->alg.cra_refcnt, 1); 219 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, 220 CRYPTO_MAX_ALG_NAME); 221 larval->alg.cra_priority = alg->cra_priority; 222 223 list_add(&alg->cra_list, &crypto_alg_list); 224 list_add(&larval->alg.cra_list, &crypto_alg_list); 225 226 out: 227 return larval; 228 229 free_larval: 230 kfree(larval); 231 err: 232 larval = ERR_PTR(ret); 233 goto out; 234 } 235 236 void crypto_alg_tested(const char *name, int err) 237 { 238 struct crypto_larval *test; 239 struct crypto_alg *alg; 240 struct crypto_alg *q; 241 LIST_HEAD(list); 242 243 down_write(&crypto_alg_sem); 244 list_for_each_entry(q, &crypto_alg_list, cra_list) { 245 if (crypto_is_moribund(q) || !crypto_is_larval(q)) 246 continue; 247 248 test = (struct crypto_larval *)q; 249 250 if (!strcmp(q->cra_driver_name, name)) 251 goto found; 252 } 253 254 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); 255 goto unlock; 256 257 found: 258 q->cra_flags |= CRYPTO_ALG_DEAD; 259 alg = test->adult; 260 if (err || list_empty(&alg->cra_list)) 261 goto complete; 262 263 alg->cra_flags |= CRYPTO_ALG_TESTED; 264 265 list_for_each_entry(q, &crypto_alg_list, cra_list) { 266 if (q == alg) 267 continue; 268 269 if (crypto_is_moribund(q)) 270 continue; 271 272 if (crypto_is_larval(q)) { 273 struct crypto_larval *larval = (void *)q; 274 275 /* 276 * Check to see if either our generic name or 277 * specific name can satisfy the name requested 278 * by the larval entry q. 279 */ 280 if (strcmp(alg->cra_name, q->cra_name) && 281 strcmp(alg->cra_driver_name, q->cra_name)) 282 continue; 283 284 if (larval->adult) 285 continue; 286 if ((q->cra_flags ^ alg->cra_flags) & larval->mask) 287 continue; 288 if (!crypto_mod_get(alg)) 289 continue; 290 291 larval->adult = alg; 292 continue; 293 } 294 295 if (strcmp(alg->cra_name, q->cra_name)) 296 continue; 297 298 if (strcmp(alg->cra_driver_name, q->cra_driver_name) && 299 q->cra_priority > alg->cra_priority) 300 continue; 301 302 crypto_remove_spawns(q, &list, alg); 303 } 304 305 complete: 306 complete_all(&test->completion); 307 308 unlock: 309 up_write(&crypto_alg_sem); 310 311 crypto_remove_final(&list); 312 } 313 EXPORT_SYMBOL_GPL(crypto_alg_tested); 314 315 void crypto_remove_final(struct list_head *list) 316 { 317 struct crypto_alg *alg; 318 struct crypto_alg *n; 319 320 list_for_each_entry_safe(alg, n, list, cra_list) { 321 list_del_init(&alg->cra_list); 322 crypto_alg_put(alg); 323 } 324 } 325 EXPORT_SYMBOL_GPL(crypto_remove_final); 326 327 static void crypto_wait_for_test(struct crypto_larval *larval) 328 { 329 int err; 330 331 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); 332 if (err != NOTIFY_STOP) { 333 if (WARN_ON(err != NOTIFY_DONE)) 334 goto out; 335 crypto_alg_tested(larval->alg.cra_driver_name, 0); 336 } 337 338 err = wait_for_completion_interruptible(&larval->completion); 339 WARN_ON(err); 340 341 out: 342 crypto_larval_kill(&larval->alg); 343 } 344 345 int crypto_register_alg(struct crypto_alg *alg) 346 { 347 struct crypto_larval *larval; 348 int err; 349 350 err = crypto_check_alg(alg); 351 if (err) 352 return err; 353 354 down_write(&crypto_alg_sem); 355 larval = __crypto_register_alg(alg); 356 up_write(&crypto_alg_sem); 357 358 if (IS_ERR(larval)) 359 return PTR_ERR(larval); 360 361 crypto_wait_for_test(larval); 362 return 0; 363 } 364 EXPORT_SYMBOL_GPL(crypto_register_alg); 365 366 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) 367 { 368 if (unlikely(list_empty(&alg->cra_list))) 369 return -ENOENT; 370 371 alg->cra_flags |= CRYPTO_ALG_DEAD; 372 373 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); 374 list_del_init(&alg->cra_list); 375 crypto_remove_spawns(alg, list, NULL); 376 377 return 0; 378 } 379 380 int crypto_unregister_alg(struct crypto_alg *alg) 381 { 382 int ret; 383 LIST_HEAD(list); 384 385 down_write(&crypto_alg_sem); 386 ret = crypto_remove_alg(alg, &list); 387 up_write(&crypto_alg_sem); 388 389 if (ret) 390 return ret; 391 392 BUG_ON(atomic_read(&alg->cra_refcnt) != 1); 393 if (alg->cra_destroy) 394 alg->cra_destroy(alg); 395 396 crypto_remove_final(&list); 397 return 0; 398 } 399 EXPORT_SYMBOL_GPL(crypto_unregister_alg); 400 401 int crypto_register_algs(struct crypto_alg *algs, int count) 402 { 403 int i, ret; 404 405 for (i = 0; i < count; i++) { 406 ret = crypto_register_alg(&algs[i]); 407 if (ret) 408 goto err; 409 } 410 411 return 0; 412 413 err: 414 for (--i; i >= 0; --i) 415 crypto_unregister_alg(&algs[i]); 416 417 return ret; 418 } 419 EXPORT_SYMBOL_GPL(crypto_register_algs); 420 421 int crypto_unregister_algs(struct crypto_alg *algs, int count) 422 { 423 int i, ret; 424 425 for (i = 0; i < count; i++) { 426 ret = crypto_unregister_alg(&algs[i]); 427 if (ret) 428 pr_err("Failed to unregister %s %s: %d\n", 429 algs[i].cra_driver_name, algs[i].cra_name, ret); 430 } 431 432 return 0; 433 } 434 EXPORT_SYMBOL_GPL(crypto_unregister_algs); 435 436 int crypto_register_template(struct crypto_template *tmpl) 437 { 438 struct crypto_template *q; 439 int err = -EEXIST; 440 441 down_write(&crypto_alg_sem); 442 443 crypto_check_module_sig(tmpl->module); 444 445 list_for_each_entry(q, &crypto_template_list, list) { 446 if (q == tmpl) 447 goto out; 448 } 449 450 list_add(&tmpl->list, &crypto_template_list); 451 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); 452 err = 0; 453 out: 454 up_write(&crypto_alg_sem); 455 return err; 456 } 457 EXPORT_SYMBOL_GPL(crypto_register_template); 458 459 void crypto_unregister_template(struct crypto_template *tmpl) 460 { 461 struct crypto_instance *inst; 462 struct hlist_node *n; 463 struct hlist_head *list; 464 LIST_HEAD(users); 465 466 down_write(&crypto_alg_sem); 467 468 BUG_ON(list_empty(&tmpl->list)); 469 list_del_init(&tmpl->list); 470 471 list = &tmpl->instances; 472 hlist_for_each_entry(inst, list, list) { 473 int err = crypto_remove_alg(&inst->alg, &users); 474 475 BUG_ON(err); 476 } 477 478 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); 479 480 up_write(&crypto_alg_sem); 481 482 hlist_for_each_entry_safe(inst, n, list, list) { 483 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); 484 tmpl->free(inst); 485 } 486 crypto_remove_final(&users); 487 } 488 EXPORT_SYMBOL_GPL(crypto_unregister_template); 489 490 static struct crypto_template *__crypto_lookup_template(const char *name) 491 { 492 struct crypto_template *q, *tmpl = NULL; 493 494 down_read(&crypto_alg_sem); 495 list_for_each_entry(q, &crypto_template_list, list) { 496 if (strcmp(q->name, name)) 497 continue; 498 if (unlikely(!crypto_tmpl_get(q))) 499 continue; 500 501 tmpl = q; 502 break; 503 } 504 up_read(&crypto_alg_sem); 505 506 return tmpl; 507 } 508 509 struct crypto_template *crypto_lookup_template(const char *name) 510 { 511 return try_then_request_module(__crypto_lookup_template(name), 512 "crypto-%s", name); 513 } 514 EXPORT_SYMBOL_GPL(crypto_lookup_template); 515 516 int crypto_register_instance(struct crypto_template *tmpl, 517 struct crypto_instance *inst) 518 { 519 struct crypto_larval *larval; 520 int err; 521 522 err = crypto_check_alg(&inst->alg); 523 if (err) 524 return err; 525 526 inst->alg.cra_module = tmpl->module; 527 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; 528 529 if (unlikely(!crypto_mod_get(&inst->alg))) 530 return -EAGAIN; 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); 549 550 /* Remove instance if test failed */ 551 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) 552 crypto_unregister_instance(inst); 553 err = 0; 554 555 err: 556 crypto_mod_put(&inst->alg); 557 return err; 558 } 559 EXPORT_SYMBOL_GPL(crypto_register_instance); 560 561 int crypto_unregister_instance(struct crypto_instance *inst) 562 { 563 LIST_HEAD(list); 564 565 down_write(&crypto_alg_sem); 566 567 crypto_remove_spawns(&inst->alg, &list, NULL); 568 crypto_remove_instance(inst, &list); 569 570 up_write(&crypto_alg_sem); 571 572 crypto_remove_final(&list); 573 574 return 0; 575 } 576 EXPORT_SYMBOL_GPL(crypto_unregister_instance); 577 578 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 579 struct crypto_instance *inst, u32 mask) 580 { 581 int err = -EAGAIN; 582 583 spawn->inst = inst; 584 spawn->mask = mask; 585 586 down_write(&crypto_alg_sem); 587 if (!crypto_is_moribund(alg)) { 588 list_add(&spawn->list, &alg->cra_users); 589 spawn->alg = alg; 590 err = 0; 591 } 592 up_write(&crypto_alg_sem); 593 594 return err; 595 } 596 EXPORT_SYMBOL_GPL(crypto_init_spawn); 597 598 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, 599 struct crypto_instance *inst, 600 const struct crypto_type *frontend) 601 { 602 int err = -EINVAL; 603 604 if ((alg->cra_flags ^ frontend->type) & frontend->maskset) 605 goto out; 606 607 spawn->frontend = frontend; 608 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); 609 610 out: 611 return err; 612 } 613 EXPORT_SYMBOL_GPL(crypto_init_spawn2); 614 615 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, 616 u32 type, u32 mask) 617 { 618 struct crypto_alg *alg; 619 int err; 620 621 alg = crypto_find_alg(name, spawn->frontend, type, mask); 622 if (IS_ERR(alg)) 623 return PTR_ERR(alg); 624 625 err = crypto_init_spawn(spawn, alg, spawn->inst, mask); 626 crypto_mod_put(alg); 627 return err; 628 } 629 EXPORT_SYMBOL_GPL(crypto_grab_spawn); 630 631 void crypto_drop_spawn(struct crypto_spawn *spawn) 632 { 633 if (!spawn->alg) 634 return; 635 636 down_write(&crypto_alg_sem); 637 list_del(&spawn->list); 638 up_write(&crypto_alg_sem); 639 } 640 EXPORT_SYMBOL_GPL(crypto_drop_spawn); 641 642 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) 643 { 644 struct crypto_alg *alg; 645 struct crypto_alg *alg2; 646 647 down_read(&crypto_alg_sem); 648 alg = spawn->alg; 649 alg2 = alg; 650 if (alg2) 651 alg2 = crypto_mod_get(alg2); 652 up_read(&crypto_alg_sem); 653 654 if (!alg2) { 655 if (alg) 656 crypto_shoot_alg(alg); 657 return ERR_PTR(-EAGAIN); 658 } 659 660 return alg; 661 } 662 663 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 664 u32 mask) 665 { 666 struct crypto_alg *alg; 667 struct crypto_tfm *tfm; 668 669 alg = crypto_spawn_alg(spawn); 670 if (IS_ERR(alg)) 671 return ERR_CAST(alg); 672 673 tfm = ERR_PTR(-EINVAL); 674 if (unlikely((alg->cra_flags ^ type) & mask)) 675 goto out_put_alg; 676 677 tfm = __crypto_alloc_tfm(alg, type, mask); 678 if (IS_ERR(tfm)) 679 goto out_put_alg; 680 681 return tfm; 682 683 out_put_alg: 684 crypto_mod_put(alg); 685 return tfm; 686 } 687 EXPORT_SYMBOL_GPL(crypto_spawn_tfm); 688 689 void *crypto_spawn_tfm2(struct crypto_spawn *spawn) 690 { 691 struct crypto_alg *alg; 692 struct crypto_tfm *tfm; 693 694 alg = crypto_spawn_alg(spawn); 695 if (IS_ERR(alg)) 696 return ERR_CAST(alg); 697 698 tfm = crypto_create_tfm(alg, spawn->frontend); 699 if (IS_ERR(tfm)) 700 goto out_put_alg; 701 702 return tfm; 703 704 out_put_alg: 705 crypto_mod_put(alg); 706 return tfm; 707 } 708 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); 709 710 int crypto_register_notifier(struct notifier_block *nb) 711 { 712 return blocking_notifier_chain_register(&crypto_chain, nb); 713 } 714 EXPORT_SYMBOL_GPL(crypto_register_notifier); 715 716 int crypto_unregister_notifier(struct notifier_block *nb) 717 { 718 return blocking_notifier_chain_unregister(&crypto_chain, nb); 719 } 720 EXPORT_SYMBOL_GPL(crypto_unregister_notifier); 721 722 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) 723 { 724 struct rtattr *rta = tb[0]; 725 struct crypto_attr_type *algt; 726 727 if (!rta) 728 return ERR_PTR(-ENOENT); 729 if (RTA_PAYLOAD(rta) < sizeof(*algt)) 730 return ERR_PTR(-EINVAL); 731 if (rta->rta_type != CRYPTOA_TYPE) 732 return ERR_PTR(-EINVAL); 733 734 algt = RTA_DATA(rta); 735 736 return algt; 737 } 738 EXPORT_SYMBOL_GPL(crypto_get_attr_type); 739 740 int crypto_check_attr_type(struct rtattr **tb, u32 type) 741 { 742 struct crypto_attr_type *algt; 743 744 algt = crypto_get_attr_type(tb); 745 if (IS_ERR(algt)) 746 return PTR_ERR(algt); 747 748 if ((algt->type ^ type) & algt->mask) 749 return -EINVAL; 750 751 return 0; 752 } 753 EXPORT_SYMBOL_GPL(crypto_check_attr_type); 754 755 const char *crypto_attr_alg_name(struct rtattr *rta) 756 { 757 struct crypto_attr_alg *alga; 758 759 if (!rta) 760 return ERR_PTR(-ENOENT); 761 if (RTA_PAYLOAD(rta) < sizeof(*alga)) 762 return ERR_PTR(-EINVAL); 763 if (rta->rta_type != CRYPTOA_ALG) 764 return ERR_PTR(-EINVAL); 765 766 alga = RTA_DATA(rta); 767 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; 768 769 return alga->name; 770 } 771 EXPORT_SYMBOL_GPL(crypto_attr_alg_name); 772 773 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, 774 const struct crypto_type *frontend, 775 u32 type, u32 mask) 776 { 777 const char *name; 778 779 name = crypto_attr_alg_name(rta); 780 if (IS_ERR(name)) 781 return ERR_CAST(name); 782 783 return crypto_find_alg(name, frontend, type, mask); 784 } 785 EXPORT_SYMBOL_GPL(crypto_attr_alg2); 786 787 int crypto_attr_u32(struct rtattr *rta, u32 *num) 788 { 789 struct crypto_attr_u32 *nu32; 790 791 if (!rta) 792 return -ENOENT; 793 if (RTA_PAYLOAD(rta) < sizeof(*nu32)) 794 return -EINVAL; 795 if (rta->rta_type != CRYPTOA_U32) 796 return -EINVAL; 797 798 nu32 = RTA_DATA(rta); 799 *num = nu32->num; 800 801 return 0; 802 } 803 EXPORT_SYMBOL_GPL(crypto_attr_u32); 804 805 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, 806 unsigned int head) 807 { 808 struct crypto_instance *inst; 809 char *p; 810 int err; 811 812 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), 813 GFP_KERNEL); 814 if (!p) 815 return ERR_PTR(-ENOMEM); 816 817 inst = (void *)(p + head); 818 819 err = -ENAMETOOLONG; 820 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, 821 alg->cra_name) >= CRYPTO_MAX_ALG_NAME) 822 goto err_free_inst; 823 824 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", 825 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 826 goto err_free_inst; 827 828 return p; 829 830 err_free_inst: 831 kfree(p); 832 return ERR_PTR(err); 833 } 834 EXPORT_SYMBOL_GPL(crypto_alloc_instance2); 835 836 struct crypto_instance *crypto_alloc_instance(const char *name, 837 struct crypto_alg *alg) 838 { 839 struct crypto_instance *inst; 840 struct crypto_spawn *spawn; 841 int err; 842 843 inst = crypto_alloc_instance2(name, alg, 0); 844 if (IS_ERR(inst)) 845 goto out; 846 847 spawn = crypto_instance_ctx(inst); 848 err = crypto_init_spawn(spawn, alg, inst, 849 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); 850 851 if (err) 852 goto err_free_inst; 853 854 return inst; 855 856 err_free_inst: 857 kfree(inst); 858 inst = ERR_PTR(err); 859 860 out: 861 return inst; 862 } 863 EXPORT_SYMBOL_GPL(crypto_alloc_instance); 864 865 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) 866 { 867 INIT_LIST_HEAD(&queue->list); 868 queue->backlog = &queue->list; 869 queue->qlen = 0; 870 queue->max_qlen = max_qlen; 871 } 872 EXPORT_SYMBOL_GPL(crypto_init_queue); 873 874 int crypto_enqueue_request(struct crypto_queue *queue, 875 struct crypto_async_request *request) 876 { 877 int err = -EINPROGRESS; 878 879 if (unlikely(queue->qlen >= queue->max_qlen)) { 880 err = -EBUSY; 881 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) 882 goto out; 883 if (queue->backlog == &queue->list) 884 queue->backlog = &request->list; 885 } 886 887 queue->qlen++; 888 list_add_tail(&request->list, &queue->list); 889 890 out: 891 return err; 892 } 893 EXPORT_SYMBOL_GPL(crypto_enqueue_request); 894 895 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) 896 { 897 struct list_head *request; 898 899 if (unlikely(!queue->qlen)) 900 return NULL; 901 902 queue->qlen--; 903 904 if (queue->backlog != &queue->list) 905 queue->backlog = queue->backlog->next; 906 907 request = queue->list.next; 908 list_del(request); 909 910 return (char *)list_entry(request, struct crypto_async_request, list) - 911 offset; 912 } 913 EXPORT_SYMBOL_GPL(__crypto_dequeue_request); 914 915 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) 916 { 917 return __crypto_dequeue_request(queue, 0); 918 } 919 EXPORT_SYMBOL_GPL(crypto_dequeue_request); 920 921 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) 922 { 923 struct crypto_async_request *req; 924 925 list_for_each_entry(req, &queue->list, list) { 926 if (req->tfm == tfm) 927 return 1; 928 } 929 930 return 0; 931 } 932 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); 933 934 static inline void crypto_inc_byte(u8 *a, unsigned int size) 935 { 936 u8 *b = (a + size); 937 u8 c; 938 939 for (; size; size--) { 940 c = *--b + 1; 941 *b = c; 942 if (c) 943 break; 944 } 945 } 946 947 void crypto_inc(u8 *a, unsigned int size) 948 { 949 __be32 *b = (__be32 *)(a + size); 950 u32 c; 951 952 for (; size >= 4; size -= 4) { 953 c = be32_to_cpu(*--b) + 1; 954 *b = cpu_to_be32(c); 955 if (c) 956 return; 957 } 958 959 crypto_inc_byte(a, size); 960 } 961 EXPORT_SYMBOL_GPL(crypto_inc); 962 963 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) 964 { 965 for (; size; size--) 966 *a++ ^= *b++; 967 } 968 969 void crypto_xor(u8 *dst, const u8 *src, unsigned int size) 970 { 971 u32 *a = (u32 *)dst; 972 u32 *b = (u32 *)src; 973 974 for (; size >= 4; size -= 4) 975 *a++ ^= *b++; 976 977 crypto_xor_byte((u8 *)a, (u8 *)b, size); 978 } 979 EXPORT_SYMBOL_GPL(crypto_xor); 980 981 unsigned int crypto_alg_extsize(struct crypto_alg *alg) 982 { 983 return alg->cra_ctxsize + 984 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); 985 } 986 EXPORT_SYMBOL_GPL(crypto_alg_extsize); 987 988 static int __init crypto_algapi_init(void) 989 { 990 crypto_init_proc(); 991 return 0; 992 } 993 994 static void __exit crypto_algapi_exit(void) 995 { 996 crypto_exit_proc(); 997 } 998 999 module_init(crypto_algapi_init); 1000 module_exit(crypto_algapi_exit); 1001 1002 MODULE_LICENSE("GPL"); 1003 MODULE_DESCRIPTION("Cryptographic algorithms API"); 1004