Add a command line string field to verified boot kernel config image.

src/platform/vboot_reference/tests/firmware_image_tests.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Tests for firmware image library.
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 
@@ skipping 30 matching lines @@
 
   Memcpy(image->magic, FIRMWARE_MAGIC, FIRMWARE_MAGIC_SIZE);
   image->firmware_sign_algorithm = algorithm;
   image->firmware_sign_key = (uint8_t*) Malloc(
       RSAProcessedKeySize(image->firmware_sign_algorithm));
   Memcpy(image->firmware_sign_key, firmware_sign_key,
          RSAProcessedKeySize(image->firmware_sign_algorithm));
   image->firmware_key_version = firmware_key_version;
 
   /* Update correct header length. */
-  image->header_len = (sizeof(image->header_len) +
-                       sizeof(image->firmware_sign_algorithm) +
-                       RSAProcessedKeySize(image->firmware_sign_algorithm) +
-                       sizeof(image->firmware_key_version) +
-                       sizeof(image->header_checksum));
+  image->header_len = GetFirmwareHeaderLen(image);
 
   /* Calculate SHA-512 digest on header and populate header_checksum. */
   DigestInit(&ctx, ROOT_SIGNATURE_ALGORITHM);
   DigestUpdate(&ctx, (uint8_t*) &image->header_len,
                sizeof(image->header_len));
   DigestUpdate(&ctx, (uint8_t*) &image->firmware_sign_algorithm,
                sizeof(image->firmware_sign_algorithm));
   DigestUpdate(&ctx, image->firmware_sign_key,
                RSAProcessedKeySize(image->firmware_sign_algorithm));
   DigestUpdate(&ctx, (uint8_t*) &image->firmware_key_version,
@@ skipping 148 matching lines @@
 
 failure:
   Free(firmware_blob);
   FirmwareImageFree(image);
   Free(firmware_sign_key_buf);
   Free(root_key_blob);
   RSAPublicKeyFree(root_key);
 
   return error_code;
 }