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/*
* Copyright 2016 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 __SRC_LIB_TPM2_MARSHALING_H
#define __SRC_LIB_TPM2_MARSHALING_H
#include "tss_constants.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* The below functions are used to serialize/deserialize TPM2 commands. */
/**
* tpm_marshal_command
*
* Given a structure containing a TPM2 command, serialize the structure for
* sending it to the TPM.
*
* @command: code of the TPM2 command to marshal
* @tpm_command_body: a pointer to the command specific structure
* @buffer: buffer where command is marshaled to
* @buffer_size: size of the buffer
*
* Returns number of bytes placed in the buffer, or -1 on error.
*
*/
int tpm_marshal_command(TPM_CC command, void *tpm_command_body,
void *buffer, int buffer_size);
/**
* tpm_unmarshal_response
*
* Given a buffer received from the TPM in response to a certain command,
* deserialize the buffer into the expeced response structure.
*
* @command: code of the TPM2 command for which a response is unmarshaled
* @response_body: buffer containing the serialized response.
* @response_size: number of bytes in the buffer containing response
* @response: structure to be filled with deserialized response,
* struct tpm2_response is a union of all possible responses.
*
* Returns 0 on success, or -1 on error.
*/
int tpm_unmarshal_response(TPM_CC command,
void *response_body,
int response_size,
struct tpm2_response *response);
/**
* tpm_get_packet_size
*
* @packet: pointer to the start of the command or response packet.
*
* Returns the size of the tpm packet.
*/
uint32_t tpm_get_packet_size(const uint8_t *packet);
/**
* tpm_get_packet_response_code
*
* @packet: pointer to the start of the response packet.
*
* Returns the response code.
*/
uint32_t tpm_get_packet_response_code(const uint8_t *packet);
/**
* tpm_set_ph_disabled
*
* Sets the flag that indicates if platform hierarchy is disabled.
* Certain commands, like NV_Read, may need to use different
* authorization if platform hierarchy is disabled.
*
* @flag: 1 if platform hierarchy is disabled, 0 otherwise
*/
void tpm_set_ph_disabled(int flag);
/**
* tpm_is_ph_disabled
*
* Gets the flag that indicates if platform hierarchy is disabled.
* Certain commands, like NV_Read, may need to use different
* authorization if platform hierarchy is disabled.
*
* Returns 1 if platform hierarchy is disabled, 0 otherwise
*/
int tpm_is_ph_disabled(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif // __SRC_LIB_TPM2_MARSHALING_H
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