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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 | /* * Copyright (c) 2017 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ #include <zephyr/init.h> #include <zephyr/kernel.h> #include <string.h> #include <zephyr/device.h> #include <zephyr/drivers/i2c.h> #include <zephyr/sys/__assert.h> #include <zephyr/crypto/crypto.h> #include "crypto_ataes132a_priv.h" #define D10D24S 11 #define MAX_RETRIES 3 #define ATAES132A_AES_KEY_SIZE 16 /* ATAES132A can store up to 16 different crypto keys */ #define CRYPTO_MAX_SESSION 16 #define LOG_LEVEL CONFIG_CRYPTO_LOG_LEVEL #include <zephyr/logging/log.h> LOG_MODULE_REGISTER(ataes132a); static struct ataes132a_driver_state ataes132a_state[CRYPTO_MAX_SESSION]; static void ataes132a_init_states(void) { int i; for (i = 0; i < ATAES132A_AES_KEY_SIZE; i++) { ataes132a_state[i].in_use = false; ataes132a_state[i].key_id = i; } } static int ataes132a_send_command(const struct device *dev, uint8_t opcode, uint8_t mode, uint8_t *params, uint8_t nparams, uint8_t *response, uint8_t *nresponse) { int retry_count = 0; struct ataes132a_device_data *data = dev->data; const struct ataes132a_device_config *cfg = dev->config; uint8_t count; uint8_t status; uint8_t crc[2]; int i, i2c_return; count = nparams + 5; if (count > 64) { LOG_ERR("command too large for command buffer"); return -EDOM; } /* If there is a command in progress, idle wait until it is available. * If there is concurrency protection around the driver, this should * never happen. */ read_reg_i2c(data->i2c, cfg->i2c_addr, ATAES_STATUS_REG, &status); while (status & ATAES_STATUS_WIP) { k_busy_wait(D10D24S); read_reg_i2c(data->i2c, cfg->i2c_addr, ATAES_STATUS_REG, &status); } data->command_buffer[0] = count; data->command_buffer[1] = opcode; data->command_buffer[2] = mode; for (i = 0; i < nparams; i++) { data->command_buffer[i + 3] = params[i]; } /*Calculate command CRC*/ ataes132a_atmel_crc(data->command_buffer, nparams + 3, crc); data->command_buffer[nparams + 3] = crc[0]; data->command_buffer[nparams + 4] = crc[1]; /*Reset i/O address start before sending a command*/ write_reg_i2c(data->i2c, cfg->i2c_addr, ATAES_COMMAND_ADDRR_RESET, 0x0); /*Send a command through the command buffer*/ i2c_return = burst_write_i2c(data->i2c, cfg->i2c_addr, ATAES_COMMAND_MEM_ADDR, data->command_buffer, count); LOG_DBG("BURST WRITE RETURN: %d", i2c_return); /* Idle-waiting for the command completion*/ do { k_busy_wait(D10D24S); read_reg_i2c(data->i2c, cfg->i2c_addr, ATAES_STATUS_REG, &status); } while (status & ATAES_STATUS_WIP); if (status & ATAES_STATUS_CRC) { LOG_ERR("incorrect CRC command"); return -EINVAL; } if (!(status & ATAES_STATUS_RDY)) { LOG_ERR("expected response is not in place"); return -EINVAL; } /* Read the response */ burst_read_i2c(data->i2c, cfg->i2c_addr, ATAES_COMMAND_MEM_ADDR, data->command_buffer, 64); count = data->command_buffer[0]; /* Calculate and validate response CRC */ ataes132a_atmel_crc(data->command_buffer, count - 2, crc); LOG_DBG("COMMAND CRC %x%x", data->command_buffer[count - 2], data->command_buffer[count - 1]); LOG_DBG("CALCULATED CRC %x%x", crc[0], crc[1]); /* If CRC fails retry reading MAX RETRIES times */ while (crc[0] != data->command_buffer[count - 2] || crc[1] != data->command_buffer[count - 1]) { if (retry_count > MAX_RETRIES - 1) { LOG_ERR("response crc validation rebase" " max retries"); return -EINVAL; } burst_read_i2c(data->i2c, cfg->i2c_addr, ATAES_COMMAND_MEM_ADDR, data->command_buffer, 64); count = data->command_buffer[0]; ataes132a_atmel_crc(data->command_buffer, count - 2, crc); retry_count++; LOG_DBG("COMMAND RETRY %d", retry_count); LOG_DBG("COMMAND CRC %x%x", data->command_buffer[count - 2], data->command_buffer[count - 1]); LOG_DBG("CALCULATED CRC %x%x", crc[0], crc[1]); } if ((status & ATAES_STATUS_ERR) || data->command_buffer[1] != 0x00) { LOG_ERR("command execution error %x", data->command_buffer[1]); return -EIO; } LOG_DBG("Read the response count: %d", count); for (i = 0; i < count - 3; i++) { response[i] = data->command_buffer[i + 1]; } *nresponse = count - 3; return 0; } int ataes132a_init(const struct device *dev) { struct ataes132a_device_data *ataes132a = dev->data; const struct ataes132a_device_config *cfg = dev->config; uint32_t i2c_cfg; LOG_DBG("ATAES132A INIT"); ataes132a->i2c = device_get_binding((char *)cfg->i2c_port); if (!ataes132a->i2c) { LOG_DBG("ATAE132A master controller not found!"); return -EINVAL; } i2c_cfg = I2C_MODE_MASTER | I2C_SPEED_SET(ATAES132A_BUS_SPEED); i2c_configure(ataes132a->i2c, i2c_cfg); k_sem_init(&ataes132a->device_sem, 1, K_SEM_MAX_LIMIT); ataes132a_init_states(); return 0; } int ataes132a_aes_ccm_decrypt(const struct device *dev, uint8_t key_id, struct ataes132a_mac_mode *mac_mode, struct ataes132a_mac_packet *mac_packet, struct cipher_aead_pkt *aead_op, uint8_t *nonce_buf) { uint8_t command_mode = 0x0; struct ataes132a_device_data *data = dev->data; uint8_t out_len; uint8_t in_buf_len; uint8_t return_code; uint8_t expected_out_len; uint8_t param_buffer[52]; if (!aead_op) { LOG_ERR("Parameter cannot be null"); return -EINVAL; } if (!aead_op->pkt) { LOG_ERR("Parameter cannot be null"); return -EINVAL; } in_buf_len = aead_op->pkt->in_len; expected_out_len = aead_op->pkt->out_len; /*The KeyConfig[EKeyID].ExternalCrypto bit must be 1b.*/ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_EXTERNAL)) { LOG_ERR("key %x external mode disabled", key_id); return -EINVAL; } if (in_buf_len != 16U && in_buf_len != 32U) { LOG_ERR("ccm mode only accepts input blocks of 16" " and 32 bytes"); return -EINVAL; } if (expected_out_len > 32) { LOG_ERR("ccm mode cannot generate more than" " 32 output bytes"); return -EINVAL; } /* If KeyConfig[key_id].AuthKey is set, then prior authentication * is required */ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_AUTHKEY)) { LOG_DBG("keep in mind key %x will require" " previous authentication", key_id); } if (!aead_op->pkt->in_buf || !aead_op->pkt->out_buf) { return 0; } /* If the KeyConfig[EKeyID].RandomNonce bit is set * the current nonce register content will be used. * If there is an invalid random nonce or if there * is no nonce synchronization between device * the decrypt operation will fail accordingly. */ if (ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_RAND_NONCE) { LOG_DBG("key %x requires random nonce," " nonce_buf will be ignored", key_id); LOG_DBG("current nonce register will be used"); } k_sem_take(&data->device_sem, K_FOREVER); /* If the KeyConfig[EKeyID].RandomNonce bit is not set * then the nonce send as parameter will be loaded into * the nonce register. */ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_RAND_NONCE) && nonce_buf) { param_buffer[0] = 0x0; param_buffer[1] = 0x0; param_buffer[2] = 0x0; param_buffer[3] = 0x0; memcpy(param_buffer + 4, nonce_buf, 12); return_code = ataes132a_send_command(dev, ATAES_NONCE_OP, 0x0, param_buffer, 16, param_buffer, &out_len); if (return_code != 0U) { LOG_ERR("nonce command ended with code %d", return_code); k_sem_give(&data->device_sem); return -EINVAL; } if (param_buffer[0] != 0U) { LOG_ERR("nonce command failed with error" " code %d", param_buffer[0]); k_sem_give(&data->device_sem); return -EIO; } } /* If the KeyConfig[EKeyID].RandomNonce bit is not set * and the nonce send as parameter is a null value, * the command will use the current nonce register value. */ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_RAND_NONCE) && !nonce_buf) { LOG_DBG("current nonce register will be used"); } /* Client decryption mode requires a MAC packet to specify the * encryption key id and the MAC count of the encryption device * to synchronize MAC generation */ if (mac_packet) { param_buffer[0] = mac_packet->encryption_key_id; param_buffer[2] = mac_packet->encryption_mac_count; } else { param_buffer[0] = 0x0; param_buffer[2] = 0x0; LOG_DBG("normal decryption mode" " ignores mac_packet parameter"); } /* Client decryption mode requires a MAC packet to specify * if MAC counter, serial number and small zone number are * included in MAC generation. */ if (mac_mode) { if (mac_mode->include_counter) { LOG_DBG("including usage counter in the MAC: " "decrypt and encrypt dev must be the same"); command_mode = command_mode | ATAES_MAC_MODE_COUNTER; } if (mac_mode->include_serial) { LOG_DBG("including serial number in the MAC: " "decrypt and encrypt dev must be the same"); command_mode = command_mode | ATAES_MAC_MODE_SERIAL; } if (mac_mode->include_smallzone) { LOG_DBG("including small zone in the MAC: " "decrypt and encrypt dev share the " "first four bytes of their small zone"); command_mode = command_mode | ATAES_MAC_MODE_SMALLZONE; } } param_buffer[1] = key_id; param_buffer[3] = expected_out_len; if (aead_op->tag) { memcpy(param_buffer + 4, aead_op->tag, 16); } memcpy(param_buffer + 20, aead_op->pkt->in_buf, in_buf_len); return_code = ataes132a_send_command(dev, ATAES_DECRYPT_OP, command_mode, param_buffer, in_buf_len + 4, param_buffer, &out_len); if (return_code != 0U) { LOG_ERR("decrypt command ended with code %d", return_code); k_sem_give(&data->device_sem); return -EINVAL; } if (out_len < 2 || out_len > 33) { LOG_ERR("decrypt command response has invalid" " size %d", out_len); k_sem_give(&data->device_sem); return -EINVAL; } if (param_buffer[0] != 0U) { LOG_ERR("legacy command failed with error" " code %d", param_buffer[0]); k_sem_give(&data->device_sem); return -param_buffer[0]; } if (expected_out_len != out_len - 1) { LOG_ERR("decrypted output data size %d and expected data" " size %d are different", out_len - 1, expected_out_len); k_sem_give(&data->device_sem); return -EINVAL; } memcpy(aead_op->pkt->out_buf, param_buffer + 1, out_len - 1); k_sem_give(&data->device_sem); return 0; } int ataes132a_aes_ccm_encrypt(const struct device *dev, uint8_t key_id, struct ataes132a_mac_mode *mac_mode, struct cipher_aead_pkt *aead_op, uint8_t *nonce_buf, uint8_t *mac_count) { uint8_t command_mode = 0x0; struct ataes132a_device_data *data = dev->data; uint8_t buf_len; uint8_t out_len; uint8_t return_code; uint8_t param_buffer[40]; if (!aead_op) { LOG_ERR("Parameter cannot be null"); return -EINVAL; } if (!aead_op->pkt) { LOG_ERR("Parameter cannot be null"); return -EINVAL; } buf_len = aead_op->pkt->in_len; /*The KeyConfig[EKeyID].ExternalCrypto bit must be 1b.*/ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_EXTERNAL)) { LOG_ERR("key %x external mode disabled", key_id); return -EINVAL; } if (buf_len > 32) { LOG_ERR("only up to 32 bytes accepted for ccm mode"); return -EINVAL; } /* If KeyConfig[key_id].AuthKey is set, then prior authentication * is required */ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_AUTHKEY)) { LOG_DBG("keep in mind key %x will require" " previous authentication", key_id); } if (!aead_op->pkt->in_buf || !aead_op->pkt->out_buf) { return 0; } /* If the KeyConfig[EKeyID].RandomNonce bit is set * the current nonce register content will be used. * If there is an invalid random nonce or if there * is no nonce synchronization between device * the decrypt operation will fail accordingly. */ if (ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_RAND_NONCE) { LOG_DBG("key %x requires random nonce," " nonce_buf will be ignored", key_id); LOG_DBG("current nonce register will be used"); } k_sem_take(&data->device_sem, K_FOREVER); /* If the KeyConfig[EKeyID].RandomNonce bit is not set * then the nonce send as parameter will be loaded into * the nonce register. */ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_RAND_NONCE) && nonce_buf) { param_buffer[0] = 0x0; param_buffer[1] = 0x0; param_buffer[2] = 0x0; param_buffer[3] = 0x0; memcpy(param_buffer + 4, nonce_buf, 12); return_code = ataes132a_send_command(dev, ATAES_NONCE_OP, 0x0, param_buffer, 16, param_buffer, &out_len); if (return_code != 0U) { LOG_ERR("nonce command ended with code %d", return_code); k_sem_give(&data->device_sem); return -EINVAL; } if (param_buffer[0] != 0U) { LOG_ERR("nonce command failed with error" " code %d", param_buffer[0]); k_sem_give(&data->device_sem); return -EIO; } } /* If the KeyConfig[EKeyID].RandomNonce bit is not set * and the nonce send as parameter is a null value, * the command will use the current nonce register value. */ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_RAND_NONCE) && !nonce_buf) { LOG_DBG("current nonce register will be used"); } /* MAC packet to specify if MAC counter, serial number and small zone * number are included in MAC generation. */ if (mac_mode) { if (mac_mode->include_counter) { LOG_DBG("including usage counter in the MAC: " "decrypt and encrypt dev must be the same"); command_mode = command_mode | ATAES_MAC_MODE_COUNTER; } if (mac_mode->include_serial) { LOG_DBG("including serial number in the MAC: " "decrypt and encrypt dev must be the same"); command_mode = command_mode | ATAES_MAC_MODE_SERIAL; } if (mac_mode->include_smallzone) { LOG_DBG("including small zone in the MAC: " "decrypt and encrypt dev share the " "first four bytes of their small zone"); command_mode = command_mode | ATAES_MAC_MODE_SMALLZONE; } } param_buffer[0] = key_id; param_buffer[1] = buf_len; memcpy(param_buffer + 2, aead_op->pkt->in_buf, buf_len); return_code = ataes132a_send_command(dev, ATAES_ENCRYPT_OP, command_mode, param_buffer, buf_len + 2, param_buffer, &out_len); if (return_code != 0U) { LOG_ERR("encrypt command ended with code %d", return_code); k_sem_give(&data->device_sem); return -EINVAL; } if (out_len < 33 || out_len > 49) { LOG_ERR("encrypt command response has invalid" " size %d", out_len); k_sem_give(&data->device_sem); return -EINVAL; } if (param_buffer[0] != 0U) { LOG_ERR("encrypt command failed with error" " code %d", param_buffer[0]); k_sem_give(&data->device_sem); return -EIO; } if (aead_op->tag) { memcpy(aead_op->tag, param_buffer + 1, 16); } memcpy(aead_op->pkt->out_buf, param_buffer + 17, out_len - 17U); if (mac_mode) { if (mac_mode->include_counter) { param_buffer[0] = 0x0; param_buffer[1] = 0x0; param_buffer[2] = 0x0; param_buffer[3] = 0x0; ataes132a_send_command(dev, ATAES_INFO_OP, 0x0, param_buffer, 4, param_buffer, &out_len); if (param_buffer[0] != 0U) { LOG_ERR("info command failed with error" " code %d", param_buffer[0]); k_sem_give(&data->device_sem); return -EIO; } if (mac_count) { *mac_count = param_buffer[2]; } } } k_sem_give(&data->device_sem); return 0; } int ataes132a_aes_ecb_block(const struct device *dev, uint8_t key_id, struct cipher_pkt *pkt) { struct ataes132a_device_data *data = dev->data; uint8_t buf_len; uint8_t out_len; uint8_t return_code; uint8_t param_buffer[19]; if (!pkt) { LOG_ERR("Parameter cannot be null"); return -EINVAL; } buf_len = pkt->in_len; if (buf_len > 16) { LOG_ERR("input block cannot be above 16 bytes"); return -EINVAL; } /* AES ECB can only be executed if the ChipConfig.LegacyE configuration * is set to 1 and if KeyConfig[key_id].LegacyOK is set to 1. */ if (!(ataes132a_state[key_id].chip_config & ATAES_CHIPCONFIG_LEGACYE)) { LOG_ERR("legacy mode disabled"); return -EINVAL; } if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_LEGACYOK)) { LOG_ERR("key %x legacy mode disabled", key_id); return -EINVAL; } LOG_DBG("Chip config: %x", ataes132a_state[key_id].chip_config); LOG_DBG("Key ID: %d", key_id); LOG_DBG("Key config: %x", ataes132a_state[key_id].key_config); /* If KeyConfig[key_id].AuthKey is set, then prior authentication * is required */ if (!(ataes132a_state[key_id].key_config & ATAES_KEYCONFIG_AUTHKEY)) { LOG_DBG("keep in mind key %x will require" " previous authentication", key_id); } if (!pkt->in_buf || !pkt->out_buf) { return 0; } k_sem_take(&data->device_sem, K_FOREVER); param_buffer[0] = 0x0; param_buffer[1] = key_id; param_buffer[2] = 0x0; memcpy(param_buffer + 3, pkt->in_buf, buf_len); (void)memset(param_buffer + 3 + buf_len, 0x0, 16 - buf_len); return_code = ataes132a_send_command(dev, ATAES_LEGACY_OP, 0x00, param_buffer, buf_len + 3, param_buffer, &out_len); if (return_code != 0U) { LOG_ERR("legacy command ended with code %d", return_code); k_sem_give(&data->device_sem); return -EINVAL; } if (out_len != 17U) { LOG_ERR("legacy command response has invalid" " size %d", out_len); k_sem_give(&data->device_sem); return -EINVAL; } if (param_buffer[0] != 0U) { LOG_ERR("legacy command failed with error" " code %d", param_buffer[0]); k_sem_give(&data->device_sem); return -EIO; } memcpy(pkt->out_buf, param_buffer + 1, 16); k_sem_give(&data->device_sem); return 0; } static int do_ccm_encrypt_mac(struct cipher_ctx *ctx, struct cipher_aead_pkt *aead_op, uint8_t *nonce) { const struct device *dev = ctx->device; struct ataes132a_driver_state *state = ctx->drv_sessn_state; struct ataes132a_mac_mode mac_mode; uint8_t key_id; key_id = state->key_id; __ASSERT_NO_MSG(*(uint8_t *)ctx->key.handle == key_id); /* Removing all this salt from the MAC reduces the protection * but allows any other crypto implementations to authorize * the message. */ mac_mode.include_counter = false; mac_mode.include_serial = false; mac_mode.include_smallzone = false; if (aead_op->pkt->in_len <= 16 && aead_op->pkt->out_buf_max < 16) { LOG_ERR("Not enough space available in out buffer."); return -EINVAL; } if (aead_op->pkt->in_len > 16 && aead_op->pkt->out_buf_max < 32) { LOG_ERR("Not enough space available in out buffer."); return -EINVAL; } if (aead_op->pkt->in_len <= 16) { aead_op->pkt->out_len = 16; } else if (aead_op->pkt->in_len > 16) { aead_op->pkt->out_len = 32; } if (aead_op->ad != NULL || aead_op->ad_len != 0U) { LOG_ERR("Associated data is not supported."); return -EINVAL; } ataes132a_aes_ccm_encrypt(dev, key_id, &mac_mode, aead_op, nonce, NULL); return 0; } static int do_ccm_decrypt_auth(struct cipher_ctx *ctx, struct cipher_aead_pkt *aead_op, uint8_t *nonce) { const struct device *dev = ctx->device; struct ataes132a_driver_state *state = ctx->drv_sessn_state; struct ataes132a_mac_mode mac_mode; uint8_t key_id; key_id = state->key_id; __ASSERT_NO_MSG(*(uint8_t *)ctx->key.handle == key_id); /* Removing all this salt from the MAC reduces the protection * but allows any other crypto implementations to authorize * the message. */ mac_mode.include_counter = false; mac_mode.include_serial = false; mac_mode.include_smallzone = false; if (aead_op->pkt->in_len <= 16 && aead_op->pkt->out_buf_max < 16) { LOG_ERR("Not enough space available in out buffer."); return -EINVAL; } if (aead_op->pkt->in_len > 16 && aead_op->pkt->out_buf_max < 32) { LOG_ERR("Not enough space available in out buffer."); return -EINVAL; } aead_op->pkt->ctx = ctx; if (aead_op->ad != NULL || aead_op->ad_len != 0U) { LOG_ERR("Associated data is not supported."); return -EINVAL; } /* Normal Decryption Mode will only decrypt host generated packets */ ataes132a_aes_ccm_decrypt(dev, key_id, &mac_mode, NULL, aead_op, nonce); return 0; } static int do_block(struct cipher_ctx *ctx, struct cipher_pkt *pkt) { const struct device *dev = ctx->device; struct ataes132a_driver_state *state = ctx->drv_sessn_state; uint8_t key_id; key_id = state->key_id; __ASSERT_NO_MSG(*(uint8_t *)ctx->key.handle == key_id); if (pkt->out_buf_max < 16) { LOG_ERR("Not enough space available in out buffer."); return -EINVAL; } pkt->out_len = 16; return ataes132a_aes_ecb_block(dev, key_id, pkt); } static int ataes132a_session_free(const struct device *dev, struct cipher_ctx *session) { struct ataes132a_driver_state *state = session->drv_sessn_state; ARG_UNUSED(dev); state->in_use = false; return 0; } static int ataes132a_session_setup(const struct device *dev, struct cipher_ctx *ctx, enum cipher_algo algo, enum cipher_mode mode, enum cipher_op op_type) { uint8_t key_id = *((uint8_t *)ctx->key.handle); struct ataes132a_device_data *data = dev->data; const struct ataes132a_device_config *cfg = dev->config; uint8_t config; if (ataes132a_state[key_id].in_use) { LOG_ERR("Session in progress"); return -EINVAL; } if (mode == CRYPTO_CIPHER_MODE_CCM && ctx->mode_params.ccm_info.tag_len != 16U) { LOG_ERR("ATAES132A support 16 byte tag only."); return -EINVAL; } if (mode == CRYPTO_CIPHER_MODE_CCM && ctx->mode_params.ccm_info.nonce_len != 12U) { LOG_ERR("ATAES132A support 12 byte nonce only."); return -EINVAL; } ataes132a_state[key_id].in_use = true; read_reg_i2c(data->i2c, cfg->i2c_addr, ATAES_KEYCFG_REG(key_id), &config); ataes132a_state[key_id].key_config = config; read_reg_i2c(data->i2c, cfg->i2c_addr, ATAES_CHIPCONFIG_REG, &config); ataes132a_state[key_id].chip_config = config; ctx->drv_sessn_state = &ataes132a_state[key_id]; ctx->device = dev; if (algo != CRYPTO_CIPHER_ALGO_AES) { LOG_ERR("ATAES132A unsupported algorithm"); return -EINVAL; } /*ATAES132A support I2C polling only*/ if (!(ctx->flags & CAP_SYNC_OPS)) { LOG_ERR("Async not supported by this driver"); return -EINVAL; } if (ctx->keylen != ATAES132A_AES_KEY_SIZE) { LOG_ERR("ATAES132A unsupported key size"); return -EINVAL; } if (op_type == CRYPTO_CIPHER_OP_ENCRYPT) { switch (mode) { case CRYPTO_CIPHER_MODE_ECB: ctx->ops.block_crypt_hndlr = do_block; break; case CRYPTO_CIPHER_MODE_CCM: ctx->ops.ccm_crypt_hndlr = do_ccm_encrypt_mac; break; default: LOG_ERR("ATAES132A unsupported mode"); return -EINVAL; } } else { switch (mode) { case CRYPTO_CIPHER_MODE_ECB: ctx->ops.block_crypt_hndlr = do_block; break; case CRYPTO_CIPHER_MODE_CCM: ctx->ops.ccm_crypt_hndlr = do_ccm_decrypt_auth; break; default: LOG_ERR("ATAES132A unsupported mode"); return -EINVAL; } } ctx->ops.cipher_mode = mode; return 0; } static int ataes132a_query_caps(const struct device *dev) { return (CAP_OPAQUE_KEY_HNDL | CAP_SEPARATE_IO_BUFS | CAP_SYNC_OPS | CAP_AUTONONCE); } const struct ataes132a_device_config ataes132a_config = { .i2c_port = CONFIG_CRYPTO_ATAES132A_I2C_PORT_NAME, .i2c_addr = CONFIG_CRYPTO_ATAES132A_I2C_ADDR, .i2c_speed = ATAES132A_BUS_SPEED, }; static struct crypto_driver_api crypto_enc_funcs = { .cipher_begin_session = ataes132a_session_setup, .cipher_free_session = ataes132a_session_free, .cipher_async_callback_set = NULL, .query_hw_caps = ataes132a_query_caps, }; struct ataes132a_device_data ataes132a_data; DEVICE_DEFINE(ataes132a, CONFIG_CRYPTO_ATAES132A_DRV_NAME, ataes132a_init, NULL, &ataes132a_data, &ataes132a_config, POST_KERNEL, CONFIG_CRYPTO_INIT_PRIORITY, (void *)&crypto_enc_funcs); |