Modifying the kernel_utility tool to create our magic blob.

src/platform/vboot_reference/vkernel/include/kernel_image.h

 /* 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.
  *
  * API definitions for a generating and manipulating verified boot kernel images.
  * (Userland portion.)
  */
 
 #ifndef VBOOT_REFERENCE_KERNEL_IMAGE_H_
 #define VBOOT_REFERENCE_KERNEL_IMAGE_H_
@@ skipping 45 matching lines @@
 
 /* Write kernel data from [image] to a file named [input_file].
  * If [is_only_vblock] is non-zero, only the verification block is output.
  *
  * Return 1 on success, 0 on error.
  */
 int WriteKernelImage(const char* input_file,
                      const KernelImage* image,
                      int is_only_vblock);
 
+/* Create a kernel_data blob from its components and fill
+ * its length into blob_len, plus some information about the bootloader.
+ *
+ * Caller owns the returned pointer and must Free() it.
+ */
+uint8_t* GenerateKernelBlob(const char* vmlinuz_file,
+                            const char* config_file,
+                            const char* bootloader_file,
+                            uint64_t* blob_len,
+                            uint64_t* bootloader_offset,
+                            uint64_t* bootloader_size);
+
 /* Pretty print the contents of [image]. Only headers and metadata information
  * is printed.
  */
 void PrintKernelImage(const KernelImage* image);
 
 /* Performs a chained verify of the kernel [image]. If [dev_mode] is
  * 0 (inactive), then the [firmware_signing_key] is used to verify the signature
  * of the signing key, else the check is skipped.
  *
  * Returns 0 on success, error code on failure.
@@ skipping 17 matching lines @@
  * using the private signing key in file [kernel_sigining_key_file].
  *
  * Return 1 on success, 0 on failure.
  */
 int AddKernelSignature(KernelImage* image,
                        const char* kernel_sigining_key_file);
 
 void PrintKernelEntry(kernel_entry* entry);
 
 #endif  /* VBOOT_REFERENCE_KERNEL_IMAGE_H_ */