/* Copyright (c) 2011 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 TRUNKS_TPM_AUTHORIZATION_H_
#define TRUNKS_TPM_AUTHORIZATION_H_

#include "g_tpm_structures.h"

/* Structure to store the context of a OIAP or OSAP session. */
typedef struct {
  /* Session handle. */
  TPM_HANDLE handle;
  /* Session secret. */
  uint8_t secret[TPM_SHA1_160_HASH_LEN];
  /* Nonce generated by the caller and associated with the session. */
  TPM_NONCE nonceEven;
  /* Nonce generated by the TPM and associated with the session. */
  TPM_NONCE nonceOdd;
  /* Nonce generated by the caller and associated with the object. */
  TPM_NONCE nonceEvenOSAP;
  /* Nonce generated by the TPM and associated with the object. */
  TPM_NONCE nonceOddOSAP;
  /* Whether to continue with the session. */
  TPM_BOOL continueAuthSession;
} APSession;

/* Computes and marshals the authorization trailer of a TPM request. */
void TtlComputeAndMarshal_TPM_AUTH(
    APSession* auth, uint8_t* cmd, uint32_t cmd_length,
    uint32_t ordinal, uint8_t** cursorp);

/* Unmarshals and verifies the authorization trailer of a TPM response. */
TPM_RESULT TtlUnmarshalAndVerify_TPM_AUTH(
    APSession* auth, uint8_t* cmd, uint32_t cmd_length,
    uint32_t ordinal, uint8_t** cursorp);

#endif  /* TRUNKS_TPM_AUTHORIZATION_H_ */