Add a kernel subkey signing algorithm key and algorithm fields to firmware preamble.

src/platform/vboot_reference/tests/test_common.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.
  *
  * Common functions used by tests.
  */
 
 #include "test_common.h"
 
 #include <stdio.h>
@@ skipping 54 matching lines @@
 
   /* Update correct header length. */
   image->header_len = GetFirmwareHeaderLen(image);
 
   /* Calculate SHA-512 digest on header and populate header_checksum. */
   CalculateFirmwareHeaderChecksum(image, image->header_checksum);
 
   /* Populate firmware and preamble with dummy data. */
   image->firmware_version = firmware_version;
   image->firmware_len = firmware_len;
+  /* Make the kernel subkey the same as the firmware signing key. */
+  image->kernel_subkey_sign_algorithm = algorithm;
+  image->kernel_subkey_sign_key = (uint8_t*) Malloc(
+      RSAProcessedKeySize(image->kernel_subkey_sign_algorithm));
+  Memcpy(image->kernel_subkey_sign_key, firmware_sign_key,
+         RSAProcessedKeySize(image->kernel_subkey_sign_algorithm));
   image->preamble_signature = image->firmware_signature = NULL;
   Memset(image->preamble, 'P', FIRMWARE_PREAMBLE_SIZE);
   image->firmware_data = Malloc(image->firmware_len);
   Memset(image->firmware_data, firmware_data_fill_char, image->firmware_len);
 
   /* Generate and populate signatures. */
   if (!AddFirmwareKeySignature(image, root_key_file)) {
     debug("Couldn't create key signature.\n");
     FirmwareImageFree(image);
     return NULL;
@@ skipping 161 matching lines @@
  if (!image)
    return NULL;
  if (is_corrupt) {
    /* Invalidate image. */
    Memset(image->kernel_data, 'X', image->kernel_len);
  }
  kernel_blob = GetKernelBlob(image, &len);
  KernelImageFree(image);
  return kernel_blob;
 }