db2b8db715
Add new functions, psa_load_persistent_key(), psa_free_persistent_key_data(), and psa_save_persistent_key(), for managing persistent keys. These functions load to or save from our internal representation of key slots. Serialization is a concern of the storage backend implementation and doesn't abstraction-leak into the lifetime management code. An initial implementation for files is provided. Additional storage backends can implement this interface for other storage types.
113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/**
|
|
* \file psa_crypto_storage_backend.h
|
|
*
|
|
* \brief PSA cryptography module: Mbed TLS key storage backend
|
|
*/
|
|
/*
|
|
* Copyright (C) 2018, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
|
|
#ifndef PSA_CRYPTO_STORAGE_BACKEND_H
|
|
#define PSA_CRYPTO_STORAGE_BACKEND_H
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Include the Mbed TLS configuration file, the way Mbed TLS does it
|
|
* in each of its header files. */
|
|
#if defined(MBEDTLS_CONFIG_FILE)
|
|
#include MBEDTLS_CONFIG_FILE
|
|
#else
|
|
#include "mbedtls/config.h"
|
|
#endif
|
|
|
|
#include "psa/crypto.h"
|
|
#include "psa_crypto_storage.h"
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* \brief Load persistent data for the given key slot number.
|
|
*
|
|
* This function reads data from a storage backend and returns the data in a
|
|
* buffer.
|
|
*
|
|
* \param key Slot number whose content is to be loaded. This must
|
|
* be a key slot whose lifetime is set to persistent.
|
|
* \param[out] data Buffer where the data is to be written.
|
|
* \param data_size Size of the \c data buffer in bytes.
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
* \retval PSA_ERROR_STORAGE_FAILURE
|
|
*/
|
|
psa_status_t psa_crypto_storage_load( const psa_key_slot_t key, uint8_t *data,
|
|
size_t data_size );
|
|
|
|
/**
|
|
* \brief Store persistent data for the given key slot number.
|
|
*
|
|
* This function stores the given data buffer to a persistent storage.
|
|
*
|
|
* \param key Slot number whose content is to be stored.
|
|
* \param[in] data Buffer containing the data to be stored.
|
|
* \param data_length The number of bytes
|
|
* that make up the data.
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
* \retval PSA_ERROR_INSUFFICIENT_STORAGE
|
|
* \retval PSA_ERROR_STORAGE_FAILURE
|
|
*/
|
|
psa_status_t psa_crypto_storage_store( const psa_key_slot_t key,
|
|
const uint8_t *data,
|
|
size_t data_length );
|
|
|
|
/**
|
|
* \brief Checks if persistent data is stored for the given key slot number
|
|
*
|
|
* This function checks if any key data or metadata exists for the key slot in
|
|
* the persistent storage.
|
|
*
|
|
* \param key Slot number whose content is to be checked.
|
|
*
|
|
* \retval 0
|
|
* No persistent data present for slot number
|
|
* \retval 1
|
|
* Persistent data present for slot number
|
|
*/
|
|
int psa_is_key_present_in_storage( const psa_key_slot_t key );
|
|
|
|
/**
|
|
* \brief Get data length for given key slot number.
|
|
*
|
|
* \param key Slot number whose stored data length is to be obtained.
|
|
* \param[out] data_length The number of bytes
|
|
* that make up the data.
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
* \retval PSA_ERROR_STORAGE_FAILURE
|
|
*/
|
|
psa_status_t psa_crypto_storage_get_data_length( const psa_key_slot_t key,
|
|
size_t *data_length );
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* PSA_CRYPTO_STORAGE_H */
|