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Change-Id: Ic24a54ab520053e49efcba02bd9fa5b8ce69b20a Signed-off-by: Anastasia Klimchuk <aklm@flashrom.org> Reviewed-on: https://review.coreboot.org/c/flashrom/+/89956 Reviewed-by: Antonio Vázquez Blanco <antoniovazquezblanco@gmail.com> Reviewed-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* SPDX-License-Identifier: GPL-2.0-only
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* SPDX-FileCopyrightText: 2024 Matti Finder (written by Matti Finder <matti.finder@gmail.com>)
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*/
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#ifndef __RPMC_H__
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#define __RPMC_H__ 1
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#include <stdint.h>
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#include "flash.h" // for flashctx
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/**
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* @defgroup flashrom-rpmc RPMC operations
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* @{
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*/
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#define RPMC_OP1_MSG_HEADER_LENGTH 4
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#define RPMC_SIGNATURE_LENGTH 32
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#define RPMC_COUNTER_LENGTH 4
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#define RPMC_KEY_DATA_LENGTH 4
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#define RPMC_TAG_LENGTH 12
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#define RPMC_HMAC_KEY_LENGTH 32
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#define RPMC_TRUNCATED_SIG_LENGTH 28
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enum rpmc_result {
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RPMC_SUCCESS = 0,
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RPMC_ERROR_SPI_TRANSMISSION,
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RPMC_ERROR_OPENSSL,
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RPMC_ERROR_TAG_MISMATCH,
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RPMC_ERROR_SIGNATURE_MISMATCH,
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RPMC_ERROR_INTERNAL,
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RPMC_ERROR_KEY_READ,
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RPMC_ERROR_HARDENING_UNSUPPORTED,
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RPMC_ERROR_COUNTER_OUT_OF_RANGE,
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RPMC_ERROR_ROOT_KEY_OVERWRITE,
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RPMC_ERROR_COUNTER_UNINITIALIZED,
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RPMC_ERROR_COUNTER_DATA_MISMATCH,
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RPMC_ERROR_HMAC_KEY_REGISTER_UNINITIALIZED,
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RPMC_ERROR_WRONG_SIGNATURE
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};
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struct rpmc_status_register {
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/*
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* Values:
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* 0b00000000 -> Power on state
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* 0b10000000 -> Success
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* 0b0xxxxxx1 -> Busy
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* 0b0xxxxx1x -> Error: Root key register overwrite,
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* counter Address out of range,
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* truncated signature mismatch
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* or monotonic counter uninitialized
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* 0b0xxxx1xx -> Error: Signature mismatch,
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* counter address out of range,
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* cmdtype out of range
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* or incorrect payload size
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* 0b0xxx1xxx -> Error: Hmac key register uninitialized
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* 0b0xx1xxxx -> Error: Counter data mismatch
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* 0b0x1xxxxx -> Fatal device error
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*
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* Some bits might exclude others or their meaning might be dependent
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* on previous commands.
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* Read JESD260 or your device's data sheet for more details.
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*/
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uint8_t status;
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unsigned char tag[RPMC_TAG_LENGTH];
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uint32_t counter_data;
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unsigned char signature[RPMC_SIGNATURE_LENGTH];
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};
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/**
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* @brief Write root key on flashchip
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*
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* @param[in] flash Flash context which rpmc options will be used
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* @param[in] keyfile Location of 32-byte key to use
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* @param[in] counter_address Address of counter (starts at 0)
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*
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* @return The result of the operation
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*/
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enum rpmc_result rpmc_write_root_key(struct flashrom_flashctx *flash,
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const char *keyfile,
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unsigned int counter_address);
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/**
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* @brief Update hmac key register
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*
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* @param[in] flash Flash context which rpmc options will be used
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* @param[in] keyfile Location of 32-byte key to use
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* @param[in] key_data 4-bytes of data to use as key data
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* @param[in] counter_address Address of counter (starts at 0)
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*
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* @return The result of the operation
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*/
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enum rpmc_result rpmc_update_hmac_key(struct flashrom_flashctx *flash,
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const char *keyfile,
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uint32_t key_data,
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unsigned int counter_address);
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/**
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* @brief Increment monotonic counter value
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*
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* @param[in] flash Flash context which rpmc options will be used
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* @param[in] keyfile Location of 32-byte key to use
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* @param[in] key_data 4-bytes of data to use as key data
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* @param[in] counter_address Address of counter (starts at 0)
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* @param[in] previous_value Previous value of counter
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*
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* @return The result of the operation
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*/
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enum rpmc_result rpmc_increment_counter(struct flashrom_flashctx *flash,
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const char *keyfile,
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uint32_t key_data,
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unsigned int counter_address,
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uint32_t previous_value);
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/**
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* @brief Get monotonic counter value
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*
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* @param[in] flash Flash context which rpmc options will be used
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* @param[in] keyfile Location of 32-byte key to use
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* @param[in] key_data 4-bytes of data to use as key data
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* @param[in] counter_address Address of counter (starts at 0)
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* @param[out] counter_value Pointer to write the counter value to
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*
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* @return The result of the operation
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*/
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enum rpmc_result rpmc_get_monotonic_counter(struct flashrom_flashctx *flash,
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const char *keyfile,
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uint32_t key_data,
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unsigned int counter_address,
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uint32_t *counter_value);
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/**
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* @brief Read the full JESD260 extended status register
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*
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* @param[in] flash Flash context which rpmc options will be used
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* @param[out] status Status register to write data into
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*
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* @return The result of the operation
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*/
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enum rpmc_result rpmc_read_data(struct flashrom_flashctx *flash,
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struct rpmc_status_register *status);
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/**
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* @brief Get a string description for rpmc result
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*
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* @param[in] value A rpmc result
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*
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* @return String description
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*/
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const char * rpmc_describe_result(enum rpmc_result value);
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/** @} */ /* end flashrom-rpmc */
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#endif /* !__RPMC_H__ */
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