1 /* 2 * Copyright (c) 2013, Google Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include "mkimage.h" 8 #include <stdio.h> 9 #include <string.h> 10 #include <image.h> 11 #include <time.h> 12 #include <openssl/bn.h> 13 #include <openssl/rsa.h> 14 #include <openssl/pem.h> 15 #include <openssl/err.h> 16 #include <openssl/ssl.h> 17 #include <openssl/evp.h> 18 #include <openssl/engine.h> 19 20 #if OPENSSL_VERSION_NUMBER >= 0x10000000L 21 #define HAVE_ERR_REMOVE_THREAD_STATE 22 #endif 23 24 #if OPENSSL_VERSION_NUMBER < 0x10100000L 25 static void RSA_get0_key(const RSA *r, 26 const BIGNUM **n, const BIGNUM **e, const BIGNUM **d) 27 { 28 if (n != NULL) 29 *n = r->n; 30 if (e != NULL) 31 *e = r->e; 32 if (d != NULL) 33 *d = r->d; 34 } 35 #endif 36 37 static int rsa_err(const char *msg) 38 { 39 unsigned long sslErr = ERR_get_error(); 40 41 fprintf(stderr, "%s", msg); 42 fprintf(stderr, ": %s\n", 43 ERR_error_string(sslErr, 0)); 44 45 return -1; 46 } 47 48 /** 49 * rsa_pem_get_pub_key() - read a public key from a .crt file 50 * 51 * @keydir: Directory containins the key 52 * @name Name of key file (will have a .crt extension) 53 * @rsap Returns RSA object, or NULL on failure 54 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL) 55 */ 56 static int rsa_pem_get_pub_key(const char *keydir, const char *name, RSA **rsap) 57 { 58 char path[1024]; 59 EVP_PKEY *key; 60 X509 *cert; 61 RSA *rsa; 62 FILE *f; 63 int ret; 64 65 *rsap = NULL; 66 snprintf(path, sizeof(path), "%s/%s.crt", keydir, name); 67 f = fopen(path, "r"); 68 if (!f) { 69 fprintf(stderr, "Couldn't open RSA certificate: '%s': %s\n", 70 path, strerror(errno)); 71 return -EACCES; 72 } 73 74 /* Read the certificate */ 75 cert = NULL; 76 if (!PEM_read_X509(f, &cert, NULL, NULL)) { 77 rsa_err("Couldn't read certificate"); 78 ret = -EINVAL; 79 goto err_cert; 80 } 81 82 /* Get the public key from the certificate. */ 83 key = X509_get_pubkey(cert); 84 if (!key) { 85 rsa_err("Couldn't read public key\n"); 86 ret = -EINVAL; 87 goto err_pubkey; 88 } 89 90 /* Convert to a RSA_style key. */ 91 rsa = EVP_PKEY_get1_RSA(key); 92 if (!rsa) { 93 rsa_err("Couldn't convert to a RSA style key"); 94 ret = -EINVAL; 95 goto err_rsa; 96 } 97 fclose(f); 98 EVP_PKEY_free(key); 99 X509_free(cert); 100 *rsap = rsa; 101 102 return 0; 103 104 err_rsa: 105 EVP_PKEY_free(key); 106 err_pubkey: 107 X509_free(cert); 108 err_cert: 109 fclose(f); 110 return ret; 111 } 112 113 /** 114 * rsa_engine_get_pub_key() - read a public key from given engine 115 * 116 * @keydir: Key prefix 117 * @name Name of key 118 * @engine Engine to use 119 * @rsap Returns RSA object, or NULL on failure 120 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL) 121 */ 122 static int rsa_engine_get_pub_key(const char *keydir, const char *name, 123 ENGINE *engine, RSA **rsap) 124 { 125 const char *engine_id; 126 char key_id[1024]; 127 EVP_PKEY *key; 128 RSA *rsa; 129 int ret; 130 131 *rsap = NULL; 132 133 engine_id = ENGINE_get_id(engine); 134 135 if (engine_id && !strcmp(engine_id, "pkcs11")) { 136 if (keydir) 137 snprintf(key_id, sizeof(key_id), 138 "pkcs11:%s;object=%s;type=public", 139 keydir, name); 140 else 141 snprintf(key_id, sizeof(key_id), 142 "pkcs11:object=%s;type=public", 143 name); 144 } else { 145 fprintf(stderr, "Engine not supported\n"); 146 return -ENOTSUP; 147 } 148 149 key = ENGINE_load_public_key(engine, key_id, NULL, NULL); 150 if (!key) 151 return rsa_err("Failure loading public key from engine"); 152 153 /* Convert to a RSA_style key. */ 154 rsa = EVP_PKEY_get1_RSA(key); 155 if (!rsa) { 156 rsa_err("Couldn't convert to a RSA style key"); 157 ret = -EINVAL; 158 goto err_rsa; 159 } 160 161 EVP_PKEY_free(key); 162 *rsap = rsa; 163 164 return 0; 165 166 err_rsa: 167 EVP_PKEY_free(key); 168 return ret; 169 } 170 171 /** 172 * rsa_get_pub_key() - read a public key 173 * 174 * @keydir: Directory containing the key (PEM file) or key prefix (engine) 175 * @name Name of key file (will have a .crt extension) 176 * @engine Engine to use 177 * @rsap Returns RSA object, or NULL on failure 178 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL) 179 */ 180 static int rsa_get_pub_key(const char *keydir, const char *name, 181 ENGINE *engine, RSA **rsap) 182 { 183 if (engine) 184 return rsa_engine_get_pub_key(keydir, name, engine, rsap); 185 return rsa_pem_get_pub_key(keydir, name, rsap); 186 } 187 188 /** 189 * rsa_pem_get_priv_key() - read a private key from a .key file 190 * 191 * @keydir: Directory containing the key 192 * @name Name of key file (will have a .key extension) 193 * @rsap Returns RSA object, or NULL on failure 194 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL) 195 */ 196 static int rsa_pem_get_priv_key(const char *keydir, const char *name, 197 RSA **rsap) 198 { 199 char path[1024]; 200 RSA *rsa; 201 FILE *f; 202 203 *rsap = NULL; 204 snprintf(path, sizeof(path), "%s/%s.key", keydir, name); 205 f = fopen(path, "r"); 206 if (!f) { 207 fprintf(stderr, "Couldn't open RSA private key: '%s': %s\n", 208 path, strerror(errno)); 209 return -ENOENT; 210 } 211 212 rsa = PEM_read_RSAPrivateKey(f, 0, NULL, path); 213 if (!rsa) { 214 rsa_err("Failure reading private key"); 215 fclose(f); 216 return -EPROTO; 217 } 218 fclose(f); 219 *rsap = rsa; 220 221 return 0; 222 } 223 224 /** 225 * rsa_engine_get_priv_key() - read a private key from given engine 226 * 227 * @keydir: Key prefix 228 * @name Name of key 229 * @engine Engine to use 230 * @rsap Returns RSA object, or NULL on failure 231 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL) 232 */ 233 static int rsa_engine_get_priv_key(const char *keydir, const char *name, 234 ENGINE *engine, RSA **rsap) 235 { 236 const char *engine_id; 237 char key_id[1024]; 238 EVP_PKEY *key; 239 RSA *rsa; 240 int ret; 241 242 *rsap = NULL; 243 244 engine_id = ENGINE_get_id(engine); 245 246 if (engine_id && !strcmp(engine_id, "pkcs11")) { 247 if (keydir) 248 snprintf(key_id, sizeof(key_id), 249 "pkcs11:%s;object=%s;type=private", 250 keydir, name); 251 else 252 snprintf(key_id, sizeof(key_id), 253 "pkcs11:object=%s;type=private", 254 name); 255 } else { 256 fprintf(stderr, "Engine not supported\n"); 257 return -ENOTSUP; 258 } 259 260 key = ENGINE_load_private_key(engine, key_id, NULL, NULL); 261 if (!key) 262 return rsa_err("Failure loading private key from engine"); 263 264 /* Convert to a RSA_style key. */ 265 rsa = EVP_PKEY_get1_RSA(key); 266 if (!rsa) { 267 rsa_err("Couldn't convert to a RSA style key"); 268 ret = -EINVAL; 269 goto err_rsa; 270 } 271 272 EVP_PKEY_free(key); 273 *rsap = rsa; 274 275 return 0; 276 277 err_rsa: 278 EVP_PKEY_free(key); 279 return ret; 280 } 281 282 /** 283 * rsa_get_priv_key() - read a private key 284 * 285 * @keydir: Directory containing the key (PEM file) or key prefix (engine) 286 * @name Name of key 287 * @engine Engine to use for signing 288 * @rsap Returns RSA object, or NULL on failure 289 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL) 290 */ 291 static int rsa_get_priv_key(const char *keydir, const char *name, 292 ENGINE *engine, RSA **rsap) 293 { 294 if (engine) 295 return rsa_engine_get_priv_key(keydir, name, engine, rsap); 296 return rsa_pem_get_priv_key(keydir, name, rsap); 297 } 298 299 static int rsa_init(void) 300 { 301 int ret; 302 303 #if OPENSSL_VERSION_NUMBER < 0x10100000L 304 ret = SSL_library_init(); 305 #else 306 ret = OPENSSL_init_ssl(0, NULL); 307 #endif 308 if (!ret) { 309 fprintf(stderr, "Failure to init SSL library\n"); 310 return -1; 311 } 312 #if OPENSSL_VERSION_NUMBER < 0x10100000L 313 SSL_load_error_strings(); 314 315 OpenSSL_add_all_algorithms(); 316 OpenSSL_add_all_digests(); 317 OpenSSL_add_all_ciphers(); 318 #endif 319 320 return 0; 321 } 322 323 static int rsa_engine_init(const char *engine_id, ENGINE **pe) 324 { 325 ENGINE *e; 326 int ret; 327 328 ENGINE_load_builtin_engines(); 329 330 e = ENGINE_by_id(engine_id); 331 if (!e) { 332 fprintf(stderr, "Engine isn't available\n"); 333 ret = -1; 334 goto err_engine_by_id; 335 } 336 337 if (!ENGINE_init(e)) { 338 fprintf(stderr, "Couldn't initialize engine\n"); 339 ret = -1; 340 goto err_engine_init; 341 } 342 343 if (!ENGINE_set_default_RSA(e)) { 344 fprintf(stderr, "Couldn't set engine as default for RSA\n"); 345 ret = -1; 346 goto err_set_rsa; 347 } 348 349 *pe = e; 350 351 return 0; 352 353 err_set_rsa: 354 ENGINE_finish(e); 355 err_engine_init: 356 ENGINE_free(e); 357 err_engine_by_id: 358 #if OPENSSL_VERSION_NUMBER < 0x10100000L 359 ENGINE_cleanup(); 360 #endif 361 return ret; 362 } 363 364 static void rsa_remove(void) 365 { 366 #if OPENSSL_VERSION_NUMBER < 0x10100000L 367 CRYPTO_cleanup_all_ex_data(); 368 ERR_free_strings(); 369 #ifdef HAVE_ERR_REMOVE_THREAD_STATE 370 ERR_remove_thread_state(NULL); 371 #else 372 ERR_remove_state(0); 373 #endif 374 EVP_cleanup(); 375 #endif 376 } 377 378 static void rsa_engine_remove(ENGINE *e) 379 { 380 if (e) { 381 ENGINE_finish(e); 382 ENGINE_free(e); 383 } 384 } 385 386 /* 387 * With this data2sign.bin, we can provide it to who real holds the RAS-private 388 * key to sign current fit image. Then we replace the signature in fit image 389 * with a valid one. 390 */ 391 static void gen_data2sign(const struct image_region region[], int region_count) 392 { 393 char *file = "data2sign.bin"; 394 FILE *fd; 395 int i; 396 397 fd = fopen(file, "wb"); 398 if (!fd) { 399 fprintf(stderr, "Failed to create %s: %s\n", 400 file, strerror(errno)); 401 return -ENOENT; 402 } 403 404 for (i = 0; i < region_count; i++) 405 fwrite(region[i].data, region[i].size, 1, fd); 406 407 fclose(fd); 408 } 409 410 static int rsa_sign_with_key(RSA *rsa, struct checksum_algo *checksum_algo, 411 const struct image_region region[], int region_count, 412 uint8_t **sigp, uint *sig_size) 413 { 414 EVP_PKEY *key; 415 EVP_MD_CTX *context; 416 int size, ret = 0; 417 uint8_t *sig; 418 int i; 419 420 key = EVP_PKEY_new(); 421 if (!key) 422 return rsa_err("EVP_PKEY object creation failed"); 423 424 if (!EVP_PKEY_set1_RSA(key, rsa)) { 425 ret = rsa_err("EVP key setup failed"); 426 goto err_set; 427 } 428 429 size = EVP_PKEY_size(key); 430 sig = malloc(size); 431 if (!sig) { 432 fprintf(stderr, "Out of memory for signature (%d bytes)\n", 433 size); 434 ret = -ENOMEM; 435 goto err_alloc; 436 } 437 438 context = EVP_MD_CTX_create(); 439 if (!context) { 440 ret = rsa_err("EVP context creation failed"); 441 goto err_create; 442 } 443 EVP_MD_CTX_init(context); 444 if (!EVP_SignInit(context, checksum_algo->calculate_sign())) { 445 ret = rsa_err("Signer setup failed"); 446 goto err_sign; 447 } 448 449 for (i = 0; i < region_count; i++) { 450 if (!EVP_SignUpdate(context, region[i].data, region[i].size)) { 451 ret = rsa_err("Signing data failed"); 452 goto err_sign; 453 } 454 } 455 456 if (!EVP_SignFinal(context, sig, sig_size, key)) { 457 ret = rsa_err("Could not obtain signature"); 458 goto err_sign; 459 } 460 #if OPENSSL_VERSION_NUMBER < 0x10100000L 461 EVP_MD_CTX_cleanup(context); 462 #else 463 EVP_MD_CTX_reset(context); 464 #endif 465 EVP_MD_CTX_destroy(context); 466 EVP_PKEY_free(key); 467 468 debug("Got signature: %d bytes, expected %d\n", *sig_size, size); 469 *sigp = sig; 470 *sig_size = size; 471 472 gen_data2sign(region, region_count); 473 474 return 0; 475 476 err_sign: 477 EVP_MD_CTX_destroy(context); 478 err_create: 479 free(sig); 480 err_alloc: 481 err_set: 482 EVP_PKEY_free(key); 483 return ret; 484 } 485 486 int rsa_sign(struct image_sign_info *info, 487 const struct image_region region[], int region_count, 488 uint8_t **sigp, uint *sig_len) 489 { 490 RSA *rsa; 491 ENGINE *e = NULL; 492 int ret; 493 494 ret = rsa_init(); 495 if (ret) 496 return ret; 497 498 if (info->engine_id) { 499 ret = rsa_engine_init(info->engine_id, &e); 500 if (ret) 501 goto err_engine; 502 } 503 504 ret = rsa_get_priv_key(info->keydir, info->keyname, e, &rsa); 505 if (ret) 506 goto err_priv; 507 ret = rsa_sign_with_key(rsa, info->checksum, region, 508 region_count, sigp, sig_len); 509 if (ret) 510 goto err_sign; 511 512 RSA_free(rsa); 513 if (info->engine_id) 514 rsa_engine_remove(e); 515 rsa_remove(); 516 517 return ret; 518 519 err_sign: 520 RSA_free(rsa); 521 err_priv: 522 if (info->engine_id) 523 rsa_engine_remove(e); 524 err_engine: 525 rsa_remove(); 526 return ret; 527 } 528 529 /* 530 * rsa_get_exponent(): - Get the public exponent from an RSA key 531 */ 532 static int rsa_get_exponent(RSA *key, uint64_t *e) 533 { 534 int ret; 535 BIGNUM *bn_te; 536 const BIGNUM *key_e; 537 uint64_t te; 538 539 ret = -EINVAL; 540 bn_te = NULL; 541 542 if (!e) 543 goto cleanup; 544 545 RSA_get0_key(key, NULL, &key_e, NULL); 546 if (BN_num_bits(key_e) > 64) 547 goto cleanup; 548 549 *e = BN_get_word(key_e); 550 551 if (BN_num_bits(key_e) < 33) { 552 ret = 0; 553 goto cleanup; 554 } 555 556 bn_te = BN_dup(key_e); 557 if (!bn_te) 558 goto cleanup; 559 560 if (!BN_rshift(bn_te, bn_te, 32)) 561 goto cleanup; 562 563 if (!BN_mask_bits(bn_te, 32)) 564 goto cleanup; 565 566 te = BN_get_word(bn_te); 567 te <<= 32; 568 *e |= te; 569 ret = 0; 570 571 cleanup: 572 if (bn_te) 573 BN_free(bn_te); 574 575 return ret; 576 } 577 578 /* 579 * rsa_get_params(): - Get the important parameters of an RSA public key 580 */ 581 int rsa_get_params(RSA *key, uint64_t *exponent, uint32_t *n0_invp, 582 BIGNUM **modulusp, BIGNUM **exponent_BN, BIGNUM **r_squaredp, 583 BIGNUM **c_factorp, BIGNUM **np_factorp) 584 { 585 BIGNUM *big1, *big2, *big32, *big2_32, *big4100, *big2180; 586 BIGNUM *n, *e, *r, *r_squared, *tmp, *c_factor, *np_factor; 587 const BIGNUM *key_n, *key_e; 588 BN_CTX *bn_ctx = BN_CTX_new(); 589 int ret = 0; 590 591 /* Initialize BIGNUMs */ 592 big1 = BN_new(); 593 big2 = BN_new(); 594 big32 = BN_new(); 595 big4100 = BN_new(); 596 big2180 = BN_new(); 597 598 r = BN_new(); 599 r_squared = BN_new(); 600 c_factor = BN_new(); 601 np_factor = BN_new(); 602 tmp = BN_new(); 603 big2_32 = BN_new(); 604 n = BN_new(); 605 e = BN_new(); 606 if (!big1 || !big2 || !big32 || !big4100 || !big2180 || !r || 607 !r_squared || !tmp || !big2_32 || !n || !e || 608 !c_factor || !np_factor) { 609 fprintf(stderr, "Out of memory (bignum)\n"); 610 return -ENOMEM; 611 } 612 613 if (0 != rsa_get_exponent(key, exponent)) 614 ret = -1; 615 616 RSA_get0_key(key, &key_n, &key_e, NULL); 617 if (!BN_copy(n, key_n) || !BN_copy(e, key_e) || 618 !BN_set_word(big1, 1L) || 619 !BN_set_word(big2, 2L) || !BN_set_word(big32, 32L) || 620 !BN_set_word(big4100, 4100L) || !BN_set_word(big2180, 2180L)) 621 ret = -1; 622 623 /* big2_32 = 2^32 */ 624 if (!BN_exp(big2_32, big2, big32, bn_ctx)) 625 ret = -1; 626 627 /* Calculate n0_inv = -1 / n[0] mod 2^32 */ 628 if (!BN_mod_inverse(tmp, n, big2_32, bn_ctx) || 629 !BN_sub(tmp, big2_32, tmp)) 630 ret = -1; 631 *n0_invp = BN_get_word(tmp); 632 633 /* Calculate R = 2^(# of key bits) */ 634 if (!BN_set_word(tmp, BN_num_bits(n)) || 635 !BN_exp(r, big2, tmp, bn_ctx)) 636 ret = -1; 637 638 /* Calculate r_squared = R^2 mod n */ 639 if (!BN_copy(r_squared, r) || 640 !BN_mul(tmp, r_squared, r, bn_ctx) || 641 !BN_mod(r_squared, tmp, n, bn_ctx)) 642 ret = -1; 643 644 /* Calculate c_factor = 2^4100 mod n */ 645 if (!BN_exp(tmp, big2, big4100, bn_ctx) || 646 !BN_mod(c_factor, tmp, n, bn_ctx)) 647 ret = -1; 648 649 /* Calculate np_factor = 2^2180 div n */ 650 if (!BN_exp(tmp, big2, big2180, bn_ctx) || 651 !BN_div(np_factor, NULL, tmp, n, bn_ctx)) 652 ret = -1; 653 654 *modulusp = n; 655 *exponent_BN = e; 656 *r_squaredp = r_squared; 657 *c_factorp = c_factor; 658 *np_factorp = np_factor; 659 660 BN_free(big1); 661 BN_free(big2); 662 BN_free(big32); 663 BN_free(big4100); 664 BN_free(big2180); 665 BN_free(r); 666 BN_free(tmp); 667 BN_free(big2_32); 668 if (ret) { 669 fprintf(stderr, "Bignum operations failed\n"); 670 return -ENOMEM; 671 } 672 673 return ret; 674 } 675 676 static int fdt_add_bignum(void *blob, int noffset, const char *prop_name, 677 BIGNUM *num, int num_bits) 678 { 679 int nwords = num_bits / 32; 680 int size; 681 uint32_t *buf, *ptr; 682 BIGNUM *tmp, *big2, *big32, *big2_32; 683 BN_CTX *ctx; 684 int ret; 685 686 tmp = BN_new(); 687 big2 = BN_new(); 688 big32 = BN_new(); 689 big2_32 = BN_new(); 690 if (!tmp || !big2 || !big32 || !big2_32) { 691 fprintf(stderr, "Out of memory (bignum)\n"); 692 return -ENOMEM; 693 } 694 ctx = BN_CTX_new(); 695 if (!tmp) { 696 fprintf(stderr, "Out of memory (bignum context)\n"); 697 return -ENOMEM; 698 } 699 BN_set_word(big2, 2L); 700 BN_set_word(big32, 32L); 701 BN_exp(big2_32, big2, big32, ctx); /* B = 2^32 */ 702 703 size = nwords * sizeof(uint32_t); 704 buf = malloc(size); 705 if (!buf) { 706 fprintf(stderr, "Out of memory (%d bytes)\n", size); 707 return -ENOMEM; 708 } 709 710 /* Write out modulus as big endian array of integers */ 711 for (ptr = buf + nwords - 1; ptr >= buf; ptr--) { 712 BN_mod(tmp, num, big2_32, ctx); /* n = N mod B */ 713 *ptr = cpu_to_fdt32(BN_get_word(tmp)); 714 BN_rshift(num, num, 32); /* N = N/B */ 715 } 716 717 /* 718 * We try signing with successively increasing size values, so this 719 * might fail several times 720 */ 721 ret = fdt_setprop(blob, noffset, prop_name, buf, size); 722 if (ret) 723 return -FDT_ERR_NOSPACE; 724 free(buf); 725 BN_free(tmp); 726 BN_free(big2); 727 BN_free(big32); 728 BN_free(big2_32); 729 730 return ret; 731 } 732 733 int rsa_add_verify_data(struct image_sign_info *info, void *keydest) 734 { 735 BIGNUM *modulus, *exponent_BN, *r_squared, *c_factor, *np_factor; 736 uint64_t exponent; 737 uint32_t n0_inv; 738 int parent, node; 739 char name[100]; 740 int ret; 741 int bits; 742 RSA *rsa; 743 ENGINE *e = NULL; 744 745 debug("%s: Getting verification data\n", __func__); 746 if (info->engine_id) { 747 ret = rsa_engine_init(info->engine_id, &e); 748 if (ret) 749 return ret; 750 } 751 ret = rsa_get_pub_key(info->keydir, info->keyname, e, &rsa); 752 if (ret) 753 goto err_get_pub_key; 754 ret = rsa_get_params(rsa, &exponent, &n0_inv, &modulus, 755 &exponent_BN, &r_squared, &c_factor, &np_factor); 756 if (ret) 757 goto err_get_params; 758 bits = BN_num_bits(modulus); 759 parent = fdt_subnode_offset(keydest, 0, FIT_SIG_NODENAME); 760 if (parent == -FDT_ERR_NOTFOUND) { 761 parent = fdt_add_subnode(keydest, 0, FIT_SIG_NODENAME); 762 if (parent < 0) { 763 ret = parent; 764 if (ret != -FDT_ERR_NOSPACE) { 765 fprintf(stderr, "Couldn't create signature node: %s\n", 766 fdt_strerror(parent)); 767 } 768 } 769 } 770 if (ret) 771 goto done; 772 773 /* Either create or overwrite the named key node */ 774 snprintf(name, sizeof(name), "key-%s", info->keyname); 775 node = fdt_subnode_offset(keydest, parent, name); 776 if (node == -FDT_ERR_NOTFOUND) { 777 node = fdt_add_subnode(keydest, parent, name); 778 if (node < 0) { 779 ret = node; 780 if (ret != -FDT_ERR_NOSPACE) { 781 fprintf(stderr, "Could not create key subnode: %s\n", 782 fdt_strerror(node)); 783 } 784 } 785 } else if (node < 0) { 786 fprintf(stderr, "Cannot select keys parent: %s\n", 787 fdt_strerror(node)); 788 ret = node; 789 } 790 791 if (!ret) { 792 ret = fdt_setprop_string(keydest, node, "key-name-hint", 793 info->keyname); 794 } 795 if (!ret) 796 ret = fdt_setprop_u32(keydest, node, "rsa,num-bits", bits); 797 if (!ret) 798 ret = fdt_setprop_u32(keydest, node, "rsa,n0-inverse", n0_inv); 799 if (!ret) { 800 ret = fdt_setprop_u64(keydest, node, "rsa,exponent", exponent); 801 } 802 if (!ret) { 803 ret = fdt_add_bignum(keydest, node, "rsa,exponent-BN", 804 exponent_BN, bits); 805 } 806 if (!ret) { 807 ret = fdt_add_bignum(keydest, node, "rsa,modulus", modulus, 808 bits); 809 } 810 if (!ret) { 811 ret = fdt_add_bignum(keydest, node, "rsa,r-squared", r_squared, 812 bits); 813 } 814 if (!ret) { 815 ret = fdt_add_bignum(keydest, node, "rsa,c", c_factor, 816 bits); 817 } 818 if (!ret) { 819 ret = fdt_add_bignum(keydest, node, "rsa,np", np_factor, 820 bits); 821 } 822 if (!ret) { 823 ret = fdt_setprop_string(keydest, node, FIT_ALGO_PROP, 824 info->name); 825 } 826 if (!ret && info->require_keys) { 827 ret = fdt_setprop_string(keydest, node, "required", 828 info->require_keys); 829 } 830 done: 831 BN_free(modulus); 832 BN_free(r_squared); 833 if (ret) 834 ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO; 835 err_get_params: 836 RSA_free(rsa); 837 err_get_pub_key: 838 if (info->engine_id) 839 rsa_engine_remove(e); 840 841 return ret; 842 } 843