195 lines
6.9 KiB
C
195 lines
6.9 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef nvs_flash_h
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#define nvs_flash_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "nvs.h"
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#include "esp_partition.h"
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#define NVS_KEY_SIZE 32 // AES-256
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/**
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* @brief Key for encryption and decryption
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*/
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typedef struct {
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uint8_t eky[NVS_KEY_SIZE]; /*!< XTS encryption and decryption key*/
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uint8_t tky[NVS_KEY_SIZE]; /*!< XTS tweak key */
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} nvs_sec_cfg_t;
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/**
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* @brief Initialize the default NVS partition.
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*
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* This API initialises the default NVS partition. The default NVS partition
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* is the one that is labeled "nvs" in the partition table.
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*
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* @return
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* - ESP_OK if storage was successfully initialized.
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* - ESP_ERR_NVS_NO_FREE_PAGES if the NVS storage contains no empty pages
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* (which may happen if NVS partition was truncated)
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* - ESP_ERR_NOT_FOUND if no partition with label "nvs" is found in the partition table
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* - one of the error codes from the underlying flash storage driver
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*/
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esp_err_t nvs_flash_init(void);
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/**
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* @brief Initialize NVS flash storage for the specified partition.
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*
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* @param[in] partition_label Label of the partition. Note that internally a reference to
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* passed value is kept and it should be accessible for future operations
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*
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* @return
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* - ESP_OK if storage was successfully initialized.
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* - ESP_ERR_NVS_NO_FREE_PAGES if the NVS storage contains no empty pages
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* (which may happen if NVS partition was truncated)
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* - ESP_ERR_NOT_FOUND if specified partition is not found in the partition table
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* - one of the error codes from the underlying flash storage driver
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*/
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esp_err_t nvs_flash_init_partition(const char *partition_label);
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/**
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* @brief Deinitialize NVS storage for the default NVS partition
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*
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* Default NVS partition is the partition with "nvs" label in the partition table.
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*
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* @return
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* - ESP_OK on success (storage was deinitialized)
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* - ESP_ERR_NVS_NOT_INITIALIZED if the storage was not initialized prior to this call
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*/
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esp_err_t nvs_flash_deinit(void);
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/**
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* @brief Deinitialize NVS storage for the given NVS partition
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*
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* @param[in] partition_label Label of the partition
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_NVS_NOT_INITIALIZED if the storage for given partition was not
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* initialized prior to this call
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*/
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esp_err_t nvs_flash_deinit_partition(const char* partition_label);
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/**
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* @brief Erase the default NVS partition
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*
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* This function erases all contents of the default NVS partition (one with label "nvs")
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_NOT_FOUND if there is no NVS partition labeled "nvs" in the
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* partition table
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*/
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esp_err_t nvs_flash_erase(void);
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/**
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* @brief Erase specified NVS partition
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*
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* This function erases all contents of specified NVS partition
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*
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* @param[in] part_name Name (label) of the partition to be erased
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_NOT_FOUND if there is no NVS partition with the specified name
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* in the partition table
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*/
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esp_err_t nvs_flash_erase_partition(const char *part_name);
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/**
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* @brief Initialize the default NVS partition.
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*
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* This API initialises the default NVS partition. The default NVS partition
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* is the one that is labeled "nvs" in the partition table.
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*
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* @param[in] cfg Security configuration (keys) to be used for NVS encryption/decryption.
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* If cfg is NULL, no encryption is used.
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*
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* @return
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* - ESP_OK if storage was successfully initialized.
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* - ESP_ERR_NVS_NO_FREE_PAGES if the NVS storage contains no empty pages
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* (which may happen if NVS partition was truncated)
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* - ESP_ERR_NOT_FOUND if no partition with label "nvs" is found in the partition table
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* - one of the error codes from the underlying flash storage driver
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*/
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esp_err_t nvs_flash_secure_init(nvs_sec_cfg_t* cfg);
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/**
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* @brief Initialize NVS flash storage for the specified partition.
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*
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* @param[in] partition_label Label of the partition. Note that internally a reference to
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* passed value is kept and it should be accessible for future operations
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*
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* @param[in] cfg Security configuration (keys) to be used for NVS encryption/decryption.
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* If cfg is null, no encryption/decryption is used.
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* @return
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* - ESP_OK if storage was successfully initialized.
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* - ESP_ERR_NVS_NO_FREE_PAGES if the NVS storage contains no empty pages
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* (which may happen if NVS partition was truncated)
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* - ESP_ERR_NOT_FOUND if specified partition is not found in the partition table
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* - one of the error codes from the underlying flash storage driver
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*/
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esp_err_t nvs_flash_secure_init_partition(const char *partition_label, nvs_sec_cfg_t* cfg);
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/**
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* @brief Generate and store NVS keys in the provided esp partition
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*
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* @param[in] partition Pointer to partition structure obtained using
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* esp_partition_find_first or esp_partition_get.
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* Must be non-NULL.
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* @param[out] cfg Pointer to nvs security configuration structure.
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* Pointer must be non-NULL.
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* Generated keys will be populated in this structure.
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*
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*
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* @return
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* -ESP_OK, if cfg was read successfully;
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* -or error codes from esp_partition_write/erase APIs.
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*/
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esp_err_t nvs_flash_generate_keys(const esp_partition_t* partition, nvs_sec_cfg_t* cfg);
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/**
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* @brief Read NVS security configuration from a partition.
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*
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* @param[in] partition Pointer to partition structure obtained using
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* esp_partition_find_first or esp_partition_get.
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* Must be non-NULL.
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* @param[out] cfg Pointer to nvs security configuration structure.
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* Pointer must be non-NULL.
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*
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* @note Provided parition is assumed to be marked 'encrypted'.
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*
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* @return
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* -ESP_OK, if cfg was read successfully;
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* -ESP_ERR_NVS_KEYS_NOT_INITIALIZED, if the partition is not yet written with keys.
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* -ESP_ERR_NVS_CORRUPT_KEY_PART, if the partition containing keys is found to be corrupt
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* -or error codes from esp_partition_read API.
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*/
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esp_err_t nvs_flash_read_security_cfg(const esp_partition_t* partition, nvs_sec_cfg_t* cfg);
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#ifdef __cplusplus
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}
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#endif
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#endif /* nvs_flash_h */
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