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/*
* Copyright 2017 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __EC_BOARD_CR50_TPM_NVMEM_OPS_H
#define __EC_BOARD_CR50_TPM_NVMEM_OPS_H
#ifndef SHA256_DIGEST_SIZE
#define SHA256_DIGEST_SIZE 32
#endif /* SHA256_DIGEST_SIZE */
#define TPM_ORDERLY_STATE_SIZE 512
enum tpm_read_rv {
TPM_READ_SUCCESS,
TPM_READ_NOT_FOUND,
TPM_READ_TOO_SMALL,
};
enum tpm_write_rv {
TPM_WRITE_CREATED,
TPM_WRITE_UPDATED,
TPM_WRITE_FAIL,
};
enum tpm_nv_hidden_object {
TPM_HIDDEN_U2F_KEK,
TPM_HIDDEN_U2F_KH_SALT,
};
enum tpm_read_rv read_tpm_nvmem(uint16_t object_index,
uint16_t object_size,
void *obj_value);
/*
* The following functions must only be called from the TPM task,
* and only after TPM initialization is complete (specifically,
* after NvInitStatic).
*/
enum tpm_read_rv read_tpm_nvmem_hidden(uint16_t object_index,
uint16_t object_size,
void *obj_value);
enum tpm_write_rv write_tpm_nvmem_hidden(uint16_t object_index,
uint16_t object_size,
void *obj_value,
int commit);
/* return size of hidden nvmem object, 0 if not found */
size_t read_tpm_nvmem_size(uint16_t obj_index);
void tpm_orderly_state_capture(char copy[TPM_ORDERLY_STATE_SIZE]);
void tpm_orderly_state_restore(const char copy[TPM_ORDERLY_STATE_SIZE]);
/*
* Read value of the specified PCR in SHA-256 bank into a buffer,
* or return false if no such PCR
*/
bool get_tpm_pcr_value(uint32_t pcr_num, uint8_t value[SHA256_DIGEST_SIZE]);
#endif /* ! __EC_BOARD_CR50_TPM_NVMEM_OPS_H */
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