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.
112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/**
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* \file psa_crypto_storage_backend.h
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*
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* \brief PSA cryptography module: Mbed TLS key storage backend
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*/
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/*
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* Copyright (C) 2018, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* 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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*
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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, WITHOUT
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* 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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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef PSA_CRYPTO_STORAGE_BACKEND_H
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#define PSA_CRYPTO_STORAGE_BACKEND_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Include the Mbed TLS configuration file, the way Mbed TLS does it
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* in each of its header files. */
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#if defined(MBEDTLS_CONFIG_FILE)
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#include MBEDTLS_CONFIG_FILE
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#else
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#include "mbedtls/config.h"
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#endif
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#include "psa/crypto.h"
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#include "psa_crypto_storage.h"
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#include <stdint.h>
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/**
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* \brief Load persistent data for the given key slot number.
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*
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* This function reads data from a storage backend and returns the data in a
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* buffer.
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*
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* \param key Slot number whose content is to be loaded. This must
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* be a key slot whose lifetime is set to persistent.
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* \param[out] data Buffer where the data is to be written.
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* \param data_size Size of the \c data buffer in bytes.
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*
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* \retval PSA_SUCCESS
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* \retval PSA_ERROR_STORAGE_FAILURE
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*/
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psa_status_t psa_crypto_storage_load( const psa_key_slot_t key, uint8_t *data,
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size_t data_size );
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/**
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* \brief Store persistent data for the given key slot number.
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*
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* This function stores the given data buffer to a persistent storage.
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*
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* \param key Slot number whose content is to be stored.
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* \param[in] data Buffer containing the data to be stored.
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* \param data_length The number of bytes
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* that make up the data.
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*
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* \retval PSA_SUCCESS
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* \retval PSA_ERROR_INSUFFICIENT_STORAGE
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* \retval PSA_ERROR_STORAGE_FAILURE
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*/
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psa_status_t psa_crypto_storage_store( const psa_key_slot_t key,
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const uint8_t *data,
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size_t data_length );
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/**
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* \brief Checks if persistent data is stored for the given key slot number
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*
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* This function checks if any key data or metadata exists for the key slot in
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* the persistent storage.
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*
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* \param key Slot number whose content is to be checked.
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*
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* \retval 0
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* No persistent data present for slot number
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* \retval 1
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* Persistent data present for slot number
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*/
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int psa_is_key_present_in_storage( const psa_key_slot_t key );
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/**
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* \brief Get data length for given key slot number.
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*
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* \param key Slot number whose stored data length is to be obtained.
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* \param[out] data_length The number of bytes
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* that make up the data.
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*
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* \retval PSA_SUCCESS
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* \retval PSA_ERROR_STORAGE_FAILURE
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*/
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psa_status_t psa_crypto_storage_get_data_length( const psa_key_slot_t key,
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size_t *data_length );
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSA_CRYPTO_STORAGE_H */
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