Add vbutil_key

vboot_firmware/lib/include/vboot_struct.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.
  *
  * Data structure definitions for verified boot, for on-disk / in-eeprom
  * data.
  */
 
 #ifndef VBOOT_REFERENCE_VBOOT_STRUCT_H_
 #define VBOOT_REFERENCE_VBOOT_STRUCT_H_
 
 #include <stdint.h>
 
 
 /* Public key data */
 typedef struct VbPublicKey {
   uint64_t key_offset;     /* Offset of key data from start of this struct */
   uint64_t key_size;       /* Size of key data in bytes (NOT strength of key
                            * in bits) */
   uint64_t algorithm;      /* Signature algorithm used by the key */
   uint64_t key_version;    /* Key version */
 } VbPublicKey;
 
 
 /* Signature data (a secure hash, possibly signed) */
 typedef struct VbSignature {
   uint64_t sig_offset;  /* Offset of signature data from start of this
                          * struct */
-  uint64_t sig_size;    /* Size of signature data from start of this struct */
+  uint64_t sig_size;    /* Size of signature data in bytes */
   uint64_t data_size;   /* Size of the data block which was signed in bytes */
 } VbSignature;
 
 
 #define KEY_BLOCK_MAGIC "CHROMEOS"
 #define KEY_BLOCK_MAGIC_SIZE 8
 
 #define KEY_BLOCK_HEADER_VERSION_MAJOR 2
 #define KEY_BLOCK_HEADER_VERSION_MINOR 1
 
@@ skipping 75 matching lines @@
   uint64_t bootloader_size;          /* Size of bootloader in bytes */
   VbSignature body_signature;        /* Signature for the kernel body */
 } VbKernelPreambleHeader;
 /* This should be followed by:
  *   2) The signature data for the kernel body, pointed to by
  *      body_signature.sig_offset.
  *   3) The signature data for (VBFirmwarePreambleHeader + body signature
  *      data), pointed to by preamble_signature.sig_offset. */
 
 #endif  /* VBOOT_REFERENCE_VBOOT_STRUCT_H_ */