/*
 * Copyright (c) 2010-2012 United States Government, as represented by
 * the Secretary of Defense.  All rights reserved.
 *
 * based off of the original tools/vtpm_manager code base which is:
 * Copyright (c) 2005, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef VTPM_STORAGE_H
#define VTPM_STORAGE_h

#include "uuid.h"

#define VTPM_NVMKEY_SIZE 32
#define HASHKEYSZ (sizeof(TPM_DIGEST) + VTPM_NVMKEY_SIZE)

/* Initialize the storage system and its virtual disk */
int vtpm_storage_init(void);

/* Shutdown the storage system and its virtual disk */
void vtpm_storage_shutdown(void);

/* Loads Sha1 hash and 256 bit AES key from disk and stores them
 * packed together in outbuf. outbuf must be freed
 * by the caller using buffer_free()
 */
TPM_RESULT vtpm_storage_load_hashkey(const uuid_t uuid, uint8_t hashkey[HASHKEYSZ]);

/* inbuf must contain a sha1 hash followed by a 256 bit AES key.
 * Encrypts and stores the hash and key to disk */
TPM_RESULT vtpm_storage_save_hashkey(const uuid_t uuid, uint8_t hashkey[HASHKEYSZ]);

/* Load the vtpm manager data - call this on startup */
TPM_RESULT vtpm_storage_load_header(void);

/* Saves the vtpm manager data - call this on shutdown */
TPM_RESULT vtpm_storage_new_header(void);


#endif