Add --describe flag to {firmware|kernel}_utility.

src/platform/vboot_reference/include/kernel_utility.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.
 
 #ifndef VBOOT_REFERENCE_KERNEL_UTILITY_H_
 #define VBOOT_REFERENCE_KERNEL_UTILITY_H_
 
 #include <string>
 
 extern "C" {
@@ skipping 10 matching lines @@
   KernelUtility();
   ~KernelUtility();
 
   // Print usage to stderr.
   void PrintUsage(void);
 
   // Parse command line options and populate data members.
   // Return true on success, false on failure.
   bool ParseCmdLineOptions(int argc, char* argv[]);
 
+  // Print description of a verified boot kernel image.
+  void DescribeSignedImage();
+
   // Generate a verified boot image by reading kernel data from in_file_.
   // Return true on success, false on failure.
   bool GenerateSignedImage();
 
   // Verify a previously generated signed firmware image using the key read
   // from [firmware_key_pub_file_].
   bool VerifySignedImage();
 
   // Output the verified boot kernel image to out_file_.
   void OutputSignedImage();
 
   bool is_generate() { return is_generate_; }
   bool is_verify() { return is_verify_; }
+  bool is_describe() { return is_describe_; }
 
  private:
 
   // Check if all options were specified and sane.
   // Return true on success, false on failure.
   bool CheckOptions();
 
   KernelImage* image_;
   RSAPublicKey* firmware_key_pub_;  // Root key used for verification.
   std::string firmware_key_file_;  // Private key for signing the kernel key.
   std::string firmware_key_pub_file_;
   std::string kernel_key_file_;  // Private key for signing the kernel.
   std::string kernel_key_pub_file_;
 
   // Fields of a KernelImage. (read from the command line).
   int header_version_;
   int firmware_sign_algorithm_;
   int kernel_sign_algorithm_;
   int kernel_key_version_;
   int kernel_version_;
   kconfig_options options_;
 
   std::string in_file_;
   std::string out_file_;
   bool is_generate_;  // Are we generating a new image?
   bool is_verify_;  // Are we just verifying an already signed image?
+  bool is_describe_;  // Should we print out description of the image?
 };
 
 }  // namespace vboot_reference
 
 #endif  // VBOOT_REFERENCE_FIRMWARE_UTILITY_H_