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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 | /* Bluetooth Mesh */ /* * Copyright (c) 2017 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ #include <string.h> #include <stdbool.h> #include <errno.h> #include <toolchain.h> #include <zephyr/types.h> #include <misc/byteorder.h> #include <misc/util.h> #include <tinycrypt/constants.h> #include <tinycrypt/utils.h> #include <tinycrypt/aes.h> #include <tinycrypt/cmac_mode.h> #include <tinycrypt/ccm_mode.h> #include <bluetooth/mesh.h> #include <bluetooth/crypto.h> #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_MESH_DEBUG_CRYPTO) #include "common/log.h" #include "mesh.h" #include "crypto.h" #define NET_MIC_LEN(pdu) (((pdu)[1] & 0x80) ? 8 : 4) int bt_mesh_aes_cmac(const u8_t key[16], struct bt_mesh_sg *sg, size_t sg_len, u8_t mac[16]) { struct tc_aes_key_sched_struct sched; struct tc_cmac_struct state; if (tc_cmac_setup(&state, key, &sched) == TC_CRYPTO_FAIL) { return -EIO; } for (; sg_len; sg_len--, sg++) { if (tc_cmac_update(&state, sg->data, sg->len) == TC_CRYPTO_FAIL) { return -EIO; } } if (tc_cmac_final(mac, &state) == TC_CRYPTO_FAIL) { return -EIO; } return 0; } int bt_mesh_k1(const u8_t *ikm, size_t ikm_len, const u8_t salt[16], const char *info, u8_t okm[16]) { int err; err = bt_mesh_aes_cmac_one(salt, ikm, ikm_len, okm); if (err < 0) { return err; } return bt_mesh_aes_cmac_one(okm, info, strlen(info), okm); } int bt_mesh_k2(const u8_t n[16], const u8_t *p, size_t p_len, u8_t net_id[1], u8_t enc_key[16], u8_t priv_key[16]) { struct bt_mesh_sg sg[3]; u8_t salt[16]; u8_t out[16]; u8_t t[16]; u8_t pad; int err; BT_DBG("n %s", bt_hex(n, 16)); BT_DBG("p %s", bt_hex(p, p_len)); err = bt_mesh_s1("smk2", salt); if (err) { return err; } err = bt_mesh_aes_cmac_one(salt, n, 16, t); if (err) { return err; } pad = 0x01; sg[0].data = NULL; sg[0].len = 0; sg[1].data = p; sg[1].len = p_len; sg[2].data = &pad; sg[2].len = sizeof(pad); err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out); if (err) { return err; } net_id[0] = out[15] & 0x7f; sg[0].data = out; sg[0].len = sizeof(out); pad = 0x02; err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out); if (err) { return err; } memcpy(enc_key, out, 16); pad = 0x03; err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out); if (err) { return err; } memcpy(priv_key, out, 16); BT_DBG("NID 0x%02x enc_key %s", net_id[0], bt_hex(enc_key, 16)); BT_DBG("priv_key %s", bt_hex(priv_key, 16)); return 0; } int bt_mesh_k3(const u8_t n[16], u8_t out[8]) { u8_t id64[] = { 'i', 'd', '6', '4', 0x01 }; u8_t tmp[16]; u8_t t[16]; int err; err = bt_mesh_s1("smk3", tmp); if (err) { return err; } err = bt_mesh_aes_cmac_one(tmp, n, 16, t); if (err) { return err; } err = bt_mesh_aes_cmac_one(t, id64, sizeof(id64), tmp); if (err) { return err; } memcpy(out, tmp + 8, 8); return 0; } int bt_mesh_k4(const u8_t n[16], u8_t out[1]) { u8_t id6[] = { 'i', 'd', '6', 0x01 }; u8_t tmp[16]; u8_t t[16]; int err; err = bt_mesh_s1("smk4", tmp); if (err) { return err; } err = bt_mesh_aes_cmac_one(tmp, n, 16, t); if (err) { return err; } err = bt_mesh_aes_cmac_one(t, id6, sizeof(id6), tmp); if (err) { return err; } out[0] = tmp[15] & BIT_MASK(6); return 0; } int bt_mesh_id128(const u8_t n[16], const char *s, u8_t out[16]) { const char *id128 = "id128\x01"; u8_t salt[16]; int err; err = bt_mesh_s1(s, salt); if (err) { return err; } return bt_mesh_k1(n, 16, salt, id128, out); } static int bt_mesh_ccm_decrypt(const u8_t key[16], u8_t nonce[13], const u8_t *enc_msg, size_t msg_len, const u8_t *aad, size_t aad_len, u8_t *out_msg, size_t mic_size) { u8_t msg[16], pmsg[16], cmic[16], cmsg[16], Xn[16], mic[16]; u16_t last_blk, blk_cnt; size_t i, j; int err; if (msg_len < 1 || aad_len >= 0xff00) { return -EINVAL; } /* C_mic = e(AppKey, 0x01 || nonce || 0x0000) */ pmsg[0] = 0x01; memcpy(pmsg + 1, nonce, 13); sys_put_be16(0x0000, pmsg + 14); err = bt_encrypt_be(key, pmsg, cmic); if (err) { return err; } /* X_0 = e(AppKey, 0x09 || nonce || length) */ if (mic_size == sizeof(u64_t)) { pmsg[0] = 0x19 | (aad_len ? 0x40 : 0x00); } else { pmsg[0] = 0x09 | (aad_len ? 0x40 : 0x00); } memcpy(pmsg + 1, nonce, 13); sys_put_be16(msg_len, pmsg + 14); err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } /* If AAD is being used to authenticate, include it here */ if (aad_len) { sys_put_be16(aad_len, pmsg); for (i = 0; i < sizeof(u16_t); i++) { pmsg[i] = Xn[i] ^ pmsg[i]; } j = 0; aad_len += sizeof(u16_t); while (aad_len > 16) { do { pmsg[i] = Xn[i] ^ aad[j]; i++, j++; } while (i < 16); aad_len -= 16; i = 0; err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } } for (i = 0; i < aad_len; i++, j++) { pmsg[i] = Xn[i] ^ aad[j]; } for (i = aad_len; i < 16; i++) { pmsg[i] = Xn[i]; } err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } } last_blk = msg_len % 16; blk_cnt = (msg_len + 15) / 16; if (!last_blk) { last_blk = 16; } for (j = 0; j < blk_cnt; j++) { if (j + 1 == blk_cnt) { /* C_1 = e(AppKey, 0x01 || nonce || 0x0001) */ pmsg[0] = 0x01; memcpy(pmsg + 1, nonce, 13); sys_put_be16(j + 1, pmsg + 14); err = bt_encrypt_be(key, pmsg, cmsg); if (err) { return err; } /* Encrypted = Payload[0-15] ^ C_1 */ for (i = 0; i < last_blk; i++) { msg[i] = enc_msg[(j * 16) + i] ^ cmsg[i]; } memcpy(out_msg + (j * 16), msg, last_blk); /* X_1 = e(AppKey, X_0 ^ Payload[0-15]) */ for (i = 0; i < last_blk; i++) { pmsg[i] = Xn[i] ^ msg[i]; } for (i = last_blk; i < 16; i++) { pmsg[i] = Xn[i] ^ 0x00; } err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } /* MIC = C_mic ^ X_1 */ for (i = 0; i < sizeof(mic); i++) { mic[i] = cmic[i] ^ Xn[i]; } } else { /* C_1 = e(AppKey, 0x01 || nonce || 0x0001) */ pmsg[0] = 0x01; memcpy(pmsg + 1, nonce, 13); sys_put_be16(j + 1, pmsg + 14); err = bt_encrypt_be(key, pmsg, cmsg); if (err) { return err; } /* Encrypted = Payload[0-15] ^ C_1 */ for (i = 0; i < 16; i++) { msg[i] = enc_msg[(j * 16) + i] ^ cmsg[i]; } memcpy(out_msg + (j * 16), msg, 16); /* X_1 = e(AppKey, X_0 ^ Payload[0-15]) */ for (i = 0; i < 16; i++) { pmsg[i] = Xn[i] ^ msg[i]; } err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } } } if (memcmp(mic, enc_msg + msg_len, mic_size)) { return -EBADMSG; } return 0; } static int bt_mesh_ccm_encrypt(const u8_t key[16], u8_t nonce[13], const u8_t *msg, size_t msg_len, const u8_t *aad, size_t aad_len, u8_t *out_msg, size_t mic_size) { u8_t pmsg[16], cmic[16], cmsg[16], mic[16], Xn[16]; u16_t blk_cnt, last_blk; size_t i, j; int err; BT_DBG("key %s", bt_hex(key, 16)); BT_DBG("nonce %s", bt_hex(nonce, 13)); BT_DBG("msg (len %zu) %s", msg_len, bt_hex(msg, msg_len)); BT_DBG("aad_len %zu mic_size %zu", aad_len, mic_size); /* Unsupported AAD size */ if (aad_len >= 0xff00) { return -EINVAL; } /* C_mic = e(AppKey, 0x01 || nonce || 0x0000) */ pmsg[0] = 0x01; memcpy(pmsg + 1, nonce, 13); sys_put_be16(0x0000, pmsg + 14); err = bt_encrypt_be(key, pmsg, cmic); if (err) { return err; } /* X_0 = e(AppKey, 0x09 || nonce || length) */ if (mic_size == sizeof(u64_t)) { pmsg[0] = 0x19 | (aad_len ? 0x40 : 0x00); } else { pmsg[0] = 0x09 | (aad_len ? 0x40 : 0x00); } memcpy(pmsg + 1, nonce, 13); sys_put_be16(msg_len, pmsg + 14); err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } /* If AAD is being used to authenticate, include it here */ if (aad_len) { sys_put_be16(aad_len, pmsg); for (i = 0; i < sizeof(u16_t); i++) { pmsg[i] = Xn[i] ^ pmsg[i]; } j = 0; aad_len += sizeof(u16_t); while (aad_len > 16) { do { pmsg[i] = Xn[i] ^ aad[j]; i++, j++; } while (i < 16); aad_len -= 16; i = 0; err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } } for (i = 0; i < aad_len; i++, j++) { pmsg[i] = Xn[i] ^ aad[j]; } for (i = aad_len; i < 16; i++) { pmsg[i] = Xn[i]; } err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } } last_blk = msg_len % 16; blk_cnt = (msg_len + 15) / 16; if (!last_blk) { last_blk = 16; } for (j = 0; j < blk_cnt; j++) { if (j + 1 == blk_cnt) { /* X_1 = e(AppKey, X_0 ^ Payload[0-15]) */ for (i = 0; i < last_blk; i++) { pmsg[i] = Xn[i] ^ msg[(j * 16) + i]; } for (i = last_blk; i < 16; i++) { pmsg[i] = Xn[i] ^ 0x00; } err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } /* MIC = C_mic ^ X_1 */ for (i = 0; i < sizeof(mic); i++) { mic[i] = cmic[i] ^ Xn[i]; } /* C_1 = e(AppKey, 0x01 || nonce || 0x0001) */ pmsg[0] = 0x01; memcpy(pmsg + 1, nonce, 13); sys_put_be16(j + 1, pmsg + 14); err = bt_encrypt_be(key, pmsg, cmsg); if (err) { return err; } /* Encrypted = Payload[0-15] ^ C_1 */ for (i = 0; i < last_blk; i++) { out_msg[(j * 16) + i] = msg[(j * 16) + i] ^ cmsg[i]; } } else { /* X_1 = e(AppKey, X_0 ^ Payload[0-15]) */ for (i = 0; i < 16; i++) { pmsg[i] = Xn[i] ^ msg[(j * 16) + i]; } err = bt_encrypt_be(key, pmsg, Xn); if (err) { return err; } /* C_1 = e(AppKey, 0x01 || nonce || 0x0001) */ pmsg[0] = 0x01; memcpy(pmsg + 1, nonce, 13); sys_put_be16(j + 1, pmsg + 14); err = bt_encrypt_be(key, pmsg, cmsg); if (err) { return err; } /* Encrypted = Payload[0-15] ^ C_N */ for (i = 0; i < 16; i++) { out_msg[(j * 16) + i] = msg[(j * 16) + i] ^ cmsg[i]; } } } memcpy(out_msg + msg_len, mic, mic_size); return 0; } #if defined(CONFIG_BT_MESH_PROXY) static void create_proxy_nonce(u8_t nonce[13], const u8_t *pdu, u32_t iv_index) { /* Nonce Type */ nonce[0] = 0x03; /* Pad */ nonce[1] = 0x00; /* Sequence Number */ nonce[2] = pdu[2]; nonce[3] = pdu[3]; nonce[4] = pdu[4]; /* Source Address */ nonce[5] = pdu[5]; nonce[6] = pdu[6]; /* Pad */ nonce[7] = 0; nonce[8] = 0; /* IV Index */ sys_put_be32(iv_index, &nonce[9]); } #endif /* PROXY */ static void create_net_nonce(u8_t nonce[13], const u8_t *pdu, u32_t iv_index) { /* Nonce Type */ nonce[0] = 0x00; /* FRND + TTL */ nonce[1] = pdu[1]; /* Sequence Number */ nonce[2] = pdu[2]; nonce[3] = pdu[3]; nonce[4] = pdu[4]; /* Source Address */ nonce[5] = pdu[5]; nonce[6] = pdu[6]; /* Pad */ nonce[7] = 0; nonce[8] = 0; /* IV Index */ sys_put_be32(iv_index, &nonce[9]); } int bt_mesh_net_obfuscate(u8_t *pdu, u32_t iv_index, const u8_t privacy_key[16]) { u8_t priv_rand[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, }; u8_t tmp[16]; int err, i; BT_DBG("IVIndex %u, PrivacyKey %s", iv_index, bt_hex(privacy_key, 16)); sys_put_be32(iv_index, &priv_rand[5]); memcpy(&priv_rand[9], &pdu[7], 7); BT_DBG("PrivacyRandom %s", bt_hex(priv_rand, 16)); err = bt_encrypt_be(privacy_key, priv_rand, tmp); if (err) { return err; } for (i = 0; i < 6; i++) { pdu[1 + i] ^= tmp[i]; } return 0; } int bt_mesh_net_encrypt(const u8_t key[16], struct net_buf_simple *buf, u32_t iv_index, bool proxy) { u8_t mic_len = NET_MIC_LEN(buf->data); u8_t nonce[13]; int err; BT_DBG("IVIndex %u EncKey %s mic_len %u", iv_index, bt_hex(key, 16), mic_len); BT_DBG("PDU (len %u) %s", buf->len, bt_hex(buf->data, buf->len)); #if defined(CONFIG_BT_MESH_PROXY) if (proxy) { create_proxy_nonce(nonce, buf->data, iv_index); } else { create_net_nonce(nonce, buf->data, iv_index); } #else create_net_nonce(nonce, buf->data, iv_index); #endif BT_DBG("Nonce %s", bt_hex(nonce, 13)); err = bt_mesh_ccm_encrypt(key, nonce, &buf->data[7], buf->len - 7, NULL, 0, &buf->data[7], mic_len); if (!err) { net_buf_simple_add(buf, mic_len); } return err; } int bt_mesh_net_decrypt(const u8_t key[16], struct net_buf_simple *buf, u32_t iv_index, bool proxy) { u8_t mic_len = NET_MIC_LEN(buf->data); u8_t nonce[13]; BT_DBG("PDU (%u bytes) %s", buf->len, bt_hex(buf->data, buf->len)); BT_DBG("iv_index %u, key %s mic_len %u", iv_index, bt_hex(key, 16), mic_len); #if defined(CONFIG_BT_MESH_PROXY) if (proxy) { create_proxy_nonce(nonce, buf->data, iv_index); } else { create_net_nonce(nonce, buf->data, iv_index); } #else create_net_nonce(nonce, buf->data, iv_index); #endif BT_DBG("Nonce %s", bt_hex(nonce, 13)); buf->len -= mic_len; return bt_mesh_ccm_decrypt(key, nonce, &buf->data[7], buf->len - 7, NULL, 0, &buf->data[7], mic_len); } static void create_app_nonce(u8_t nonce[13], bool dev_key, u8_t aszmic, u16_t src, u16_t dst, u32_t seq_num, u32_t iv_index) { if (dev_key) { nonce[0] = 0x02; } else { nonce[0] = 0x01; } sys_put_be32((seq_num | ((u32_t)aszmic << 31)), &nonce[1]); sys_put_be16(src, &nonce[5]); sys_put_be16(dst, &nonce[7]); sys_put_be32(iv_index, &nonce[9]); } int bt_mesh_app_encrypt(const u8_t key[16], bool dev_key, u8_t aszmic, struct net_buf_simple *buf, const u8_t *ad, u8_t mic_len, u16_t src, u16_t dst, u32_t seq_num, u32_t iv_index) { u8_t nonce[13]; int err; BT_DBG("AppKey %s", bt_hex(key, 16)); BT_DBG("dev_key %u mic_len %u src 0x%04x dst 0x%04x", dev_key, mic_len, src, dst); BT_DBG("seq_num 0x%08x iv_index 0x%08x", seq_num, iv_index); BT_DBG("Clear: %s", bt_hex(buf->data, buf->len)); create_app_nonce(nonce, dev_key, aszmic, src, dst, seq_num, iv_index); BT_DBG("Nonce %s", bt_hex(nonce, 13)); err = bt_mesh_ccm_encrypt(key, nonce, buf->data, buf->len, ad, ad ? 16 : 0, buf->data, mic_len); if (!err) { net_buf_simple_add(buf, mic_len); BT_DBG("Encr: %s", bt_hex(buf->data, buf->len)); } return err; } int bt_mesh_app_decrypt(const u8_t key[16], bool dev_key, u8_t aszmic, struct net_buf_simple *buf, u8_t mic_len, struct net_buf_simple *out, const u8_t *ad, u16_t src, u16_t dst, u32_t seq_num, u32_t iv_index) { u8_t nonce[13]; int err; BT_DBG("EncData (len %u) %s", buf->len, bt_hex(buf->data, buf->len)); create_app_nonce(nonce, dev_key, aszmic, src, dst, seq_num, iv_index); BT_DBG("AppKey %s", bt_hex(key, 16)); BT_DBG("Nonce %s", bt_hex(nonce, 13)); err = bt_mesh_ccm_decrypt(key, nonce, buf->data, buf->len, ad, ad ? 16 : 0, out->data, mic_len); if (!err) { net_buf_simple_add(out, buf->len); } return err; } /* reversed, 8-bit, poly=0x07 */ static const u8_t crc_table[256] = { 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf }; u8_t bt_mesh_fcs_calc(const u8_t *data, u8_t data_len) { u8_t fcs = 0xff; while (data_len--) { fcs = crc_table[fcs ^ *data++]; } BT_DBG("fcs 0x%02x", 0xff - fcs); return 0xff - fcs; } bool bt_mesh_fcs_check(struct net_buf_simple *buf, u8_t received_fcs) { const u8_t *data = buf->data; u16_t data_len = buf->len; u8_t fcs = 0xff; while (data_len--) { fcs = crc_table[fcs ^ *data++]; } return crc_table[fcs ^ received_fcs] == 0xcf; } int bt_mesh_virtual_addr(const u8_t virtual_label[16], u16_t *addr) { u8_t salt[16]; u8_t tmp[16]; int err; err = bt_mesh_s1("vtad", salt); if (err) { return err; } err = bt_mesh_aes_cmac_one(salt, virtual_label, 16, tmp); if (err) { return err; } *addr = (sys_get_be16(&tmp[14]) & 0x3fff) | 0x8000; return 0; } int bt_mesh_prov_conf_salt(const u8_t conf_inputs[145], u8_t salt[16]) { const u8_t conf_salt_key[16] = { 0 }; return bt_mesh_aes_cmac_one(conf_salt_key, conf_inputs, 145, salt); } int bt_mesh_prov_conf_key(const u8_t dhkey[32], const u8_t conf_salt[16], u8_t conf_key[16]) { return bt_mesh_k1(dhkey, 32, conf_salt, "prck", conf_key); } int bt_mesh_prov_conf(const u8_t conf_key[16], const u8_t rand[16], const u8_t auth[16], u8_t conf[16]) { struct bt_mesh_sg sg[] = { { rand, 16 }, { auth, 16 } }; BT_DBG("ConfirmationKey %s", bt_hex(conf_key, 16)); BT_DBG("RandomDevice %s", bt_hex(rand, 16)); BT_DBG("AuthValue %s", bt_hex(auth, 16)); return bt_mesh_aes_cmac(conf_key, sg, ARRAY_SIZE(sg), conf); } int bt_mesh_prov_decrypt(const u8_t key[16], u8_t nonce[13], const u8_t data[25 + 8], u8_t out[25]) { return bt_mesh_ccm_decrypt(key, nonce, data, 25, NULL, 0, out, 8); } int bt_mesh_beacon_auth(const u8_t beacon_key[16], u8_t flags, const u8_t net_id[8], u32_t iv_index, u8_t auth[8]) { u8_t msg[13], tmp[16]; int err; BT_DBG("BeaconKey %s", bt_hex(beacon_key, 16)); BT_DBG("NetId %s", bt_hex(net_id, 8)); BT_DBG("IV Index 0x%08x", iv_index); msg[0] = flags; memcpy(&msg[1], net_id, 8); sys_put_be32(iv_index, &msg[9]); BT_DBG("BeaconMsg %s", bt_hex(msg, sizeof(msg))); err = bt_mesh_aes_cmac_one(beacon_key, msg, sizeof(msg), tmp); if (!err) { memcpy(auth, tmp, 8); } return err; } |