tools/image-host.c

   1 /*
   2  * Copyright (c) 2013, Google Inc.
   3  *
   4  * (C) Copyright 2008 Semihalf
   5  *
   6  * (C) Copyright 2000-2006
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include "mkimage.h"
  13 #include <bootm.h>
  14 #include <image.h>
  15 #include <version.h>
  16
  17 /**
  18  * fit_set_hash_value - set hash value in requested has node
  19  * @fit: pointer to the FIT format image header
  20  * @noffset: hash node offset
  21  * @value: hash value to be set
  22  * @value_len: hash value length
  23  *
  24  * fit_set_hash_value() attempts to set hash value in a node at offset
  25  * given and returns operation status to the caller.
  26  *
  27  * returns
  28  *     0, on success
  29  *     -1, on failure
  30  */
  31 static int fit_set_hash_value(void *fit, int noffset, uint8_t *value,
  32                                 int value_len)
  33 {
  34         int ret;
  35
  36         ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len);
  37         if (ret) {
  38                 printf("Can't set hash '%s' property for '%s' node(%s)\n",
  39                        FIT_VALUE_PROP, fit_get_name(fit, noffset, NULL),
  40                        fdt_strerror(ret));
  41                 return ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
  42         }
  43
  44         return 0;
  45 }
  46
  47 /**
  48  * fit_image_process_hash - Process a single subnode of the images/ node
  49  *
  50  * Check each subnode and process accordingly. For hash nodes we generate
  51  * a hash of the supplised data and store it in the node.
  52  *
  53  * @fit:        pointer to the FIT format image header
  54  * @image_name: name of image being processes (used to display errors)
  55  * @noffset:    subnode offset
  56  * @data:       data to process
  57  * @size:       size of data in bytes
  58  * @return 0 if ok, -1 on error
  59  */
  60 static int fit_image_process_hash(void *fit, const char *image_name,
  61                 int noffset, const void *data, size_t size)
  62 {
  63         uint8_t value[FIT_MAX_HASH_LEN];
  64         const char *node_name;
  65         int value_len;
  66         char *algo;
  67         int ret;
  68
  69         node_name = fit_get_name(fit, noffset, NULL);
  70
  71         if (fit_image_hash_get_algo(fit, noffset, &algo)) {
  72                 printf("Can't get hash algo property for '%s' hash node in '%s' image node\n",
  73                        node_name, image_name);
  74                 return -ENOENT;
  75         }
  76
  77         if (calculate_hash(data, size, algo, value, &value_len)) {
  78                 printf("Unsupported hash algorithm (%s) for '%s' hash node in '%s' image node\n",
  79                        algo, node_name, image_name);
  80                 return -EPROTONOSUPPORT;
  81         }
  82
  83         ret = fit_set_hash_value(fit, noffset, value, value_len);
  84         if (ret) {
  85                 printf("Can't set hash value for '%s' hash node in '%s' image node\n",
  86                        node_name, image_name);
  87                 return ret;
  88         }
  89
  90         return 0;
  91 }
  92
  93 /**
  94  * fit_image_write_sig() - write the signature to a FIT
  95  *
  96  * This writes the signature and signer data to the FIT.
  97  *
  98  * @fit: pointer to the FIT format image header
  99  * @noffset: hash node offset
 100  * @value: signature value to be set
 101  * @value_len: signature value length
 102  * @comment: Text comment to write (NULL for none)
 103  *
 104  * returns
 105  *     0, on success
 106  *     -FDT_ERR_..., on failure
 107  */
 108 static int fit_image_write_sig(void *fit, int noffset, uint8_t *value,
 109                 int value_len, const char *comment, const char *region_prop,
 110                 int region_proplen)
 111 {
 112         int string_size;
 113         int ret;
 114
 115         /*
 116          * Get the current string size, before we update the FIT and add
 117          * more
 118          */
 119         string_size = fdt_size_dt_strings(fit);
 120
 121         ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len);
 122         if (!ret) {
 123                 ret = fdt_setprop_string(fit, noffset, "signer-name",
 124                                          "mkimage");
 125         }
 126         if (!ret) {
 127                 ret = fdt_setprop_string(fit, noffset, "signer-version",
 128                                   PLAIN_VERSION);
 129         }
 130         if (comment && !ret)
 131                 ret = fdt_setprop_string(fit, noffset, "comment", comment);
 132         if (!ret)
 133                 ret = fit_set_timestamp(fit, noffset, time(NULL));
 134         if (region_prop && !ret) {
 135                 uint32_t strdata[2];
 136
 137                 ret = fdt_setprop(fit, noffset, "hashed-nodes",
 138                                    region_prop, region_proplen);
 139                 strdata[0] = 0;
 140                 strdata[1] = cpu_to_fdt32(string_size);
 141                 if (!ret) {
 142                         ret = fdt_setprop(fit, noffset, "hashed-strings",
 143                                           strdata, sizeof(strdata));
 144                 }
 145         }
 146
 147         return ret;
 148 }
 149
 150 static int fit_image_setup_sig(struct image_sign_info *info,
 151                 const char *keydir, void *fit, const char *image_name,
 152                 int noffset, const char *require_keys, const char *engine_id)
 153 {
 154         const char *node_name;
 155         char *algo_name;
 156
 157         node_name = fit_get_name(fit, noffset, NULL);
 158         if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
 159                 printf("Can't get algo property for '%s' signature node in '%s' image node\n",
 160                        node_name, image_name);
 161                 return -1;
 162         }
 163
 164         memset(info, '\0', sizeof(*info));
 165         info->keydir = keydir;
 166         info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
 167         info->fit = fit;
 168         info->node_offset = noffset;
 169         info->name = strdup(algo_name);
 170         info->checksum = image_get_checksum_algo(algo_name);
 171         info->crypto = image_get_crypto_algo(algo_name);
 172         info->require_keys = require_keys;
 173         info->engine_id = engine_id;
 174         if (!info->checksum || !info->crypto) {
 175                 printf("Unsupported signature algorithm (%s) for '%s' signature node in '%s' image node\n",
 176                        algo_name, node_name, image_name);
 177                 return -1;
 178         }
 179
 180         return 0;
 181 }
 182
 183 /**
 184  * fit_image_process_sig- Process a single subnode of the images/ node
 185  *
 186  * Check each subnode and process accordingly. For signature nodes we
 187  * generate a signed hash of the supplised data and store it in the node.
 188  *
 189  * @keydir:     Directory containing keys to use for signing
 190  * @keydest:    Destination FDT blob to write public keys into
 191  * @fit:        pointer to the FIT format image header
 192  * @image_name: name of image being processes (used to display errors)
 193  * @noffset:    subnode offset
 194  * @data:       data to process
 195  * @size:       size of data in bytes
 196  * @comment:    Comment to add to signature nodes
 197  * @require_keys: Mark all keys as 'required'
 198  * @engine_id:  Engine to use for signing
 199  * @return 0 if ok, -1 on error
 200  */
 201 static int fit_image_process_sig(const char *keydir, void *keydest,
 202                 void *fit, const char *image_name,
 203                 int noffset, const void *data, size_t size,
 204                 const char *comment, int require_keys, const char *engine_id)
 205 {
 206         struct image_sign_info info;
 207         struct image_region region;
 208         const char *node_name;
 209         uint8_t *value;
 210         uint value_len;
 211         int ret;
 212
 213         if (fit_image_setup_sig(&info, keydir, fit, image_name, noffset,
 214                                 require_keys ? "image" : NULL, engine_id))
 215                 return -1;
 216
 217         node_name = fit_get_name(fit, noffset, NULL);
 218         region.data = data;
 219         region.size = size;
 220         ret = info.crypto->sign(&info, &region, 1, &value, &value_len);
 221         if (ret) {
 222                 printf("Failed to sign '%s' signature node in '%s' image node: %d\n",
 223                        node_name, image_name, ret);
 224
 225                 /* We allow keys to be missing */
 226                 if (ret == -ENOENT)
 227                         return 0;
 228                 return -1;
 229         }
 230
 231         ret = fit_image_write_sig(fit, noffset, value, value_len, comment,
 232                         NULL, 0);
 233         if (ret) {
 234                 if (ret == -FDT_ERR_NOSPACE)
 235                         return -ENOSPC;
 236                 printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n",
 237                        node_name, image_name, fdt_strerror(ret));
 238                 return -1;
 239         }
 240         free(value);
 241
 242         /* Get keyname again, as FDT has changed and invalidated our pointer */
 243         info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
 244
 245         if (keydest)
 246                 ret = info.crypto->add_verify_data(&info, keydest);
 247         else
 248                 return -1;
 249
 250         /*
 251          * Write the public key into the supplied FDT file; this might fail
 252          * several times, since we try signing with successively increasing
 253          * size values
 254          */
 255         if (keydest && ret)
 256                 return ret;
 257
 258         return 0;
 259 }
 260
 261 /**
 262  * fit_image_add_verification_data() - calculate/set verig. data for image node
 263  *
 264  * This adds hash and signature values for an component image node.
 265  *
 266  * All existing hash subnodes are checked, if algorithm property is set to
 267  * one of the supported hash algorithms, hash value is computed and
 268  * corresponding hash node property is set, for example:
 269  *
 270  * Input component image node structure:
 271  *
 272  * o image@1 (at image_noffset)
 273  *   | - data = [binary data]
 274  *   o hash@1
 275  *     |- algo = "sha1"
 276  *
 277  * Output component image node structure:
 278  *
 279  * o image@1 (at image_noffset)
 280  *   | - data = [binary data]
 281  *   o hash@1
 282  *     |- algo = "sha1"
 283  *     |- value = sha1(data)
 284  *
 285  * For signature details, please see doc/uImage.FIT/signature.txt
 286  *
 287  * @keydir      Directory containing *.key and *.crt files (or NULL)
 288  * @keydest     FDT Blob to write public keys into (NULL if none)
 289  * @fit:        Pointer to the FIT format image header
 290  * @image_noffset: Requested component image node
 291  * @comment:    Comment to add to signature nodes
 292  * @require_keys: Mark all keys as 'required'
 293  * @engine_id:  Engine to use for signing
 294  * @return: 0 on success, <0 on failure
 295  */
 296 int fit_image_add_verification_data(const char *keydir, void *keydest,
 297                 void *fit, int image_noffset, const char *comment,
 298                 int require_keys, const char *engine_id)
 299 {
 300         const char *image_name;
 301         const void *data;
 302         size_t size;
 303         int noffset;
 304
 305         /* Get image data and data length */
 306         if (fit_image_get_data(fit, image_noffset, &data, &size)) {
 307                 printf("Can't get image data/size\n");
 308                 return -1;
 309         }
 310
 311         image_name = fit_get_name(fit, image_noffset, NULL);
 312
 313         /* Process all hash subnodes of the component image node */
 314         for (noffset = fdt_first_subnode(fit, image_noffset);
 315              noffset >= 0;
 316              noffset = fdt_next_subnode(fit, noffset)) {
 317                 const char *node_name;
 318                 int ret = 0;
 319
 320                 /*
 321                  * Check subnode name, must be equal to "hash" or "signature".
 322                  * Multiple hash nodes require unique unit node
 323                  * names, e.g. hash@1, hash@2, signature@1, etc.
 324                  */
 325                 node_name = fit_get_name(fit, noffset, NULL);
 326                 if (!strncmp(node_name, FIT_HASH_NODENAME,
 327                              strlen(FIT_HASH_NODENAME))) {
 328                         ret = fit_image_process_hash(fit, image_name, noffset,
 329                                                 data, size);
 330                 } else if (IMAGE_ENABLE_SIGN && keydir &&
 331                            !strncmp(node_name, FIT_SIG_NODENAME,
 332                                 strlen(FIT_SIG_NODENAME))) {
 333                         ret = fit_image_process_sig(keydir, keydest,
 334                                 fit, image_name, noffset, data, size,
 335                                 comment, require_keys, engine_id);
 336                 }
 337                 if (ret)
 338                         return ret;
 339         }
 340
 341         return 0;
 342 }
 343
 344 struct strlist {
 345         int count;
 346         char **strings;
 347 };
 348
 349 static void strlist_init(struct strlist *list)
 350 {
 351         memset(list, '\0', sizeof(*list));
 352 }
 353
 354 static void strlist_free(struct strlist *list)
 355 {
 356         int i;
 357
 358         for (i = 0; i < list->count; i++)
 359                 free(list->strings[i]);
 360         free(list->strings);
 361 }
 362
 363 static int strlist_add(struct strlist *list, const char *str)
 364 {
 365         char *dup;
 366
 367         dup = strdup(str);
 368         list->strings = realloc(list->strings,
 369                                 (list->count + 1) * sizeof(char *));
 370         if (!list || !str)
 371                 return -1;
 372         list->strings[list->count++] = dup;
 373
 374         return 0;
 375 }
 376
 377 static const char *fit_config_get_image_list(void *fit, int noffset,
 378                 int *lenp, int *allow_missingp)
 379 {
 380         static const char default_list[] = FIT_KERNEL_PROP "\0"
 381                         FIT_FDT_PROP;
 382         const char *prop;
 383
 384         /* If there is an "image" property, use that */
 385         prop = fdt_getprop(fit, noffset, "sign-images", lenp);
 386         if (prop) {
 387                 *allow_missingp = 0;
 388                 return *lenp ? prop : NULL;
 389         }
 390
 391         /* Default image list */
 392         *allow_missingp = 1;
 393         *lenp = sizeof(default_list);
 394
 395         return default_list;
 396 }
 397
 398 static int fit_config_get_hash_list(void *fit, int conf_noffset,
 399                                     int sig_offset, struct strlist *node_inc)
 400 {
 401         int allow_missing;
 402         const char *prop, *iname, *end;
 403         const char *conf_name, *sig_name;
 404         char name[200], path[200];
 405         int image_count;
 406         int ret, len;
 407
 408         conf_name = fit_get_name(fit, conf_noffset, NULL);
 409         sig_name = fit_get_name(fit, sig_offset, NULL);
 410
 411         /*
 412          * Build a list of nodes we need to hash. We always need the root
 413          * node and the configuration.
 414          */
 415         strlist_init(node_inc);
 416         snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, conf_name);
 417         if (strlist_add(node_inc, "/") ||
 418             strlist_add(node_inc, name))
 419                 goto err_mem;
 420
 421         /* Get a list of images that we intend to sign */
 422         prop = fit_config_get_image_list(fit, sig_offset, &len,
 423                                         &allow_missing);
 424         if (!prop)
 425                 return 0;
 426
 427         /* Locate the images */
 428         end = prop + len;
 429         image_count = 0;
 430         for (iname = prop; iname < end; iname += strlen(iname) + 1) {
 431                 int noffset;
 432                 int image_noffset;
 433                 int hash_count;
 434
 435                 image_noffset = fit_conf_get_prop_node(fit, conf_noffset,
 436                                                        iname);
 437                 if (image_noffset < 0) {
 438                         printf("Failed to find image '%s' in  configuration '%s/%s'\n",
 439                                iname, conf_name, sig_name);
 440                         if (allow_missing)
 441                                 continue;
 442
 443                         return -ENOENT;
 444                 }
 445
 446                 ret = fdt_get_path(fit, image_noffset, path, sizeof(path));
 447                 if (ret < 0)
 448                         goto err_path;
 449                 if (strlist_add(node_inc, path))
 450                         goto err_mem;
 451
 452                 snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH,
 453                          conf_name);
 454
 455                 /* Add all this image's hashes */
 456                 hash_count = 0;
 457                 for (noffset = fdt_first_subnode(fit, image_noffset);
 458                      noffset >= 0;
 459                      noffset = fdt_next_subnode(fit, noffset)) {
 460                         const char *name = fit_get_name(fit, noffset, NULL);
 461
 462                         if (strncmp(name, FIT_HASH_NODENAME,
 463                                     strlen(FIT_HASH_NODENAME)))
 464                                 continue;
 465                         ret = fdt_get_path(fit, noffset, path, sizeof(path));
 466                         if (ret < 0)
 467                                 goto err_path;
 468                         if (strlist_add(node_inc, path))
 469                                 goto err_mem;
 470                         hash_count++;
 471                 }
 472
 473                 if (!hash_count) {
 474                         printf("Failed to find any hash nodes in configuration '%s/%s' image '%s' - without these it is not possible to verify this image\n",
 475                                conf_name, sig_name, iname);
 476                         return -ENOMSG;
 477                 }
 478
 479                 image_count++;
 480         }
 481
 482         if (!image_count) {
 483                 printf("Failed to find any images for configuration '%s/%s'\n",
 484                        conf_name, sig_name);
 485                 return -ENOMSG;
 486         }
 487
 488         return 0;
 489
 490 err_mem:
 491         printf("Out of memory processing configuration '%s/%s'\n", conf_name,
 492                sig_name);
 493         return -ENOMEM;
 494
 495 err_path:
 496         printf("Failed to get path for image '%s' in configuration '%s/%s': %s\n",
 497                iname, conf_name, sig_name, fdt_strerror(ret));
 498         return -ENOENT;
 499 }
 500
 501 static int fit_config_get_data(void *fit, int conf_noffset, int noffset,
 502                 struct image_region **regionp, int *region_countp,
 503                 char **region_propp, int *region_proplen)
 504 {
 505         char * const exc_prop[] = {"data"};
 506         struct strlist node_inc;
 507         struct image_region *region;
 508         struct fdt_region fdt_regions[100];
 509         const char *conf_name, *sig_name;
 510         char path[200];
 511         int count, i;
 512         char *region_prop;
 513         int ret, len;
 514
 515         conf_name = fit_get_name(fit, conf_noffset, NULL);
 516         sig_name = fit_get_name(fit, noffset, NULL);
 517         debug("%s: conf='%s', sig='%s'\n", __func__, conf_name, sig_name);
 518
 519         /* Get a list of nodes we want to hash */
 520         ret = fit_config_get_hash_list(fit, conf_noffset, noffset, &node_inc);
 521         if (ret)
 522                 return ret;
 523
 524         /* Get a list of regions to hash */
 525         count = fdt_find_regions(fit, node_inc.strings, node_inc.count,
 526                         exc_prop, ARRAY_SIZE(exc_prop),
 527                         fdt_regions, ARRAY_SIZE(fdt_regions),
 528                         path, sizeof(path), 1);
 529         if (count < 0) {
 530                 printf("Failed to hash configuration '%s/%s': %s\n", conf_name,
 531                        sig_name, fdt_strerror(ret));
 532                 return -EIO;
 533         }
 534         if (count == 0) {
 535                 printf("No data to hash for configuration '%s/%s': %s\n",
 536                        conf_name, sig_name, fdt_strerror(ret));
 537                 return -EINVAL;
 538         }
 539
 540         /* Build our list of data blocks */
 541         region = fit_region_make_list(fit, fdt_regions, count, NULL);
 542         if (!region) {
 543                 printf("Out of memory hashing configuration '%s/%s'\n",
 544                        conf_name, sig_name);
 545                 return -ENOMEM;
 546         }
 547
 548         /* Create a list of all hashed properties */
 549         debug("Hash nodes:\n");
 550         for (i = len = 0; i < node_inc.count; i++) {
 551                 debug("   %s\n", node_inc.strings[i]);
 552                 len += strlen(node_inc.strings[i]) + 1;
 553         }
 554         region_prop = malloc(len);
 555         if (!region_prop) {
 556                 printf("Out of memory setting up regions for configuration '%s/%s'\n",
 557                        conf_name, sig_name);
 558                 return -ENOMEM;
 559         }
 560         for (i = len = 0; i < node_inc.count;
 561              len += strlen(node_inc.strings[i]) + 1, i++)
 562                 strcpy(region_prop + len, node_inc.strings[i]);
 563         strlist_free(&node_inc);
 564
 565         *region_countp = count;
 566         *regionp = region;
 567         *region_propp = region_prop;
 568         *region_proplen = len;
 569
 570         return 0;
 571 }
 572
 573 static int fit_config_process_sig(const char *keydir, void *keydest,
 574                 void *fit, const char *conf_name, int conf_noffset,
 575                 int noffset, const char *comment, int require_keys,
 576                 const char *engine_id)
 577 {
 578         struct image_sign_info info;
 579         const char *node_name;
 580         struct image_region *region;
 581         char *region_prop;
 582         int region_proplen;
 583         int region_count;
 584         uint8_t *value;
 585         uint value_len;
 586         int ret;
 587
 588         node_name = fit_get_name(fit, noffset, NULL);
 589         if (fit_config_get_data(fit, conf_noffset, noffset, &region,
 590                                 &region_count, &region_prop, &region_proplen))
 591                 return -1;
 592
 593         if (fit_image_setup_sig(&info, keydir, fit, conf_name, noffset,
 594                                 require_keys ? "conf" : NULL, engine_id))
 595                 return -1;
 596
 597         ret = info.crypto->sign(&info, region, region_count, &value,
 598                                 &value_len);
 599         free(region);
 600         if (ret) {
 601                 printf("Failed to sign '%s' signature node in '%s' conf node\n",
 602                        node_name, conf_name);
 603
 604                 /* We allow keys to be missing */
 605                 if (ret == -ENOENT)
 606                         return 0;
 607                 return -1;
 608         }
 609
 610         ret = fit_image_write_sig(fit, noffset, value, value_len, comment,
 611                                 region_prop, region_proplen);
 612         if (ret) {
 613                 if (ret == -FDT_ERR_NOSPACE)
 614                         return -ENOSPC;
 615                 printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n",
 616                        node_name, conf_name, fdt_strerror(ret));
 617                 return -1;
 618         }
 619         free(value);
 620         free(region_prop);
 621
 622         /* Get keyname again, as FDT has changed and invalidated our pointer */
 623         info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
 624
 625         /* Write the public key into the supplied FDT file */
 626         if (keydest) {
 627                 ret = info.crypto->add_verify_data(&info, keydest);
 628                 if (ret == -ENOSPC)
 629                         return -ENOSPC;
 630                 if (ret) {
 631                         printf("Failed to add verification data for '%s' signature node in '%s' image node\n",
 632                                node_name, conf_name);
 633                 }
 634                 return ret;
 635         }
 636
 637         return 0;
 638 }
 639
 640 static int fit_config_add_verification_data(const char *keydir, void *keydest,
 641                 void *fit, int conf_noffset, const char *comment,
 642                 int require_keys, const char *engine_id)
 643 {
 644         const char *conf_name;
 645         int noffset;
 646
 647         conf_name = fit_get_name(fit, conf_noffset, NULL);
 648
 649         /* Process all hash subnodes of the configuration node */
 650         for (noffset = fdt_first_subnode(fit, conf_noffset);
 651              noffset >= 0;
 652              noffset = fdt_next_subnode(fit, noffset)) {
 653                 const char *node_name;
 654                 int ret = 0;
 655
 656                 node_name = fit_get_name(fit, noffset, NULL);
 657                 if (!strncmp(node_name, FIT_SIG_NODENAME,
 658                              strlen(FIT_SIG_NODENAME))) {
 659                         ret = fit_config_process_sig(keydir, keydest,
 660                                 fit, conf_name, conf_noffset, noffset, comment,
 661                                 require_keys, engine_id);
 662                 }
 663                 if (ret)
 664                         return ret;
 665         }
 666
 667         return 0;
 668 }
 669
 670 int fit_add_verification_data(const char *keydir, void *keydest, void *fit,
 671                               const char *comment, int require_keys,
 672                               const char *engine_id)
 673 {
 674         int images_noffset, confs_noffset;
 675         int noffset;
 676         int ret;
 677
 678         /* Find images parent node offset */
 679         images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
 680         if (images_noffset < 0) {
 681                 printf("Can't find images parent node '%s' (%s)\n",
 682                        FIT_IMAGES_PATH, fdt_strerror(images_noffset));
 683                 return images_noffset;
 684         }
 685
 686         /* Process its subnodes, print out component images details */
 687         for (noffset = fdt_first_subnode(fit, images_noffset);
 688              noffset >= 0;
 689              noffset = fdt_next_subnode(fit, noffset)) {
 690                 /*
 691                  * Direct child node of the images parent node,
 692                  * i.e. component image node.
 693                  */
 694                 ret = fit_image_add_verification_data(keydir, keydest,
 695                                 fit, noffset, comment, require_keys, engine_id);
 696                 if (ret)
 697                         return ret;
 698         }
 699
 700         /* If there are no keys, we can't sign configurations */
 701         if (!IMAGE_ENABLE_SIGN || !keydir)
 702                 return 0;
 703
 704         /* Find configurations parent node offset */
 705         confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH);
 706         if (confs_noffset < 0) {
 707                 printf("Can't find images parent node '%s' (%s)\n",
 708                        FIT_CONFS_PATH, fdt_strerror(confs_noffset));
 709                 return -ENOENT;
 710         }
 711
 712         /* Process its subnodes, print out component images details */
 713         for (noffset = fdt_first_subnode(fit, confs_noffset);
 714              noffset >= 0;
 715              noffset = fdt_next_subnode(fit, noffset)) {
 716                 ret = fit_config_add_verification_data(keydir, keydest,
 717                                                        fit, noffset, comment,
 718                                                        require_keys,
 719                                                        engine_id);
 720                 if (ret)
 721                         return ret;
 722         }
 723
 724         return 0;
 725 }
 726
 727 #ifdef CONFIG_FIT_SIGNATURE
 728 int fit_check_sign(const void *fit, const void *key)
 729 {
 730         int cfg_noffset;
 731         int ret;
 732
 733         cfg_noffset = fit_conf_get_node(fit, NULL);
 734         if (!cfg_noffset)
 735                 return -1;
 736
 737         printf("Verifying Hash Integrity ... ");
 738         ret = fit_config_verify(fit, cfg_noffset);
 739         if (ret)
 740                 return ret;
 741         ret = bootm_host_load_images(fit, cfg_noffset);
 742
 743         return ret;
 744 }
 745 #endif