a2523b2c6d
PSA spec now defines more generic PSA storage types instead of the ITS specific ones. This is necessary in order to integrate with the newer implementation of PSA ITS landing in Mbed OS soon. Changes include the following: - psa_status_t replaces psa_its_status_t - psa_storage_info_t replaces psa_its_info_t - psa_storage_uid_t replaces psa_its_uid_t
127 lines
4.9 KiB
C
127 lines
4.9 KiB
C
/**
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* \file psa/crypto_extra.h
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*
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* \brief PSA cryptography module: Mbed TLS vendor extensions
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*
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* \note This file may not be included directly. Applications must
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* include psa/crypto.h.
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*
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* This file is reserved for vendor-specific definitions.
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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_EXTRA_H
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#define PSA_CRYPTO_EXTRA_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* UID for secure storage seed */
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#define PSA_CRYPTO_ITS_RANDOM_SEED_UID 0xFFFFFF52
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/**
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* \brief Library deinitialization.
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*
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* This function clears all data associated with the PSA layer,
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* including the whole key store.
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*
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* This is an Mbed TLS extension.
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*/
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void mbedtls_psa_crypto_free( void );
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/**
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* \brief Inject an initial entropy seed for the random generator into
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* secure storage.
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*
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* This function injects data to be used as a seed for the random generator
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* used by the PSA Crypto implementation. On devices that lack a trusted
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* entropy source (preferably a hardware random number generator),
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* the Mbed PSA Crypto implementation uses this value to seed its
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* random generator.
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*
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* On devices without a trusted entropy source, this function must be
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* called exactly once in the lifetime of the device. On devices with
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* a trusted entropy source, calling this function is optional.
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* In all cases, this function may only be called before calling any
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* other function in the PSA Crypto API, including psa_crypto_init().
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*
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* When this function returns successfully, it populates a file in
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* persistent storage. Once the file has been created, this function
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* can no longer succeed.
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*
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* If any error occurs, this function does not change the system state.
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* You can call this function again after correcting the reason for the
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* error if possible.
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*
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* \warning This function **can** fail! Callers MUST check the return status.
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*
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* \warning If you use this function, you should use it as part of a
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* factory provisioning process. The value of the injected seed
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* is critical to the security of the device. It must be
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* *secret*, *unpredictable* and (statistically) *unique per device*.
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* You should be generate it randomly using a cryptographically
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* secure random generator seeded from trusted entropy sources.
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* You should transmit it securely to the device and ensure
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* that its value is not leaked or stored anywhere beyond the
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* needs of transmitting it from the point of generation to
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* the call of this function, and erase all copies of the value
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* once this function returns.
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*
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* This is an Mbed TLS extension.
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*
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* \note This function is only available on the following platforms:
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* * If the compile-time options MBEDTLS_ENTROPY_NV_SEED and
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* MBEDTLS_PSA_HAS_ITS_IO are both enabled. Note that you
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* must provide compatible implementations of mbedtls_nv_seed_read
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* and mbedtls_nv_seed_write.
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* * In a client-server integration of PSA Cryptography, on the client side,
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* if the server supports this feature.
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* \param[in] seed Buffer containing the seed value to inject.
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* \param[in] seed_size Size of the \p seed buffer.
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* The size of the seed in bytes must be greater
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* or equal to both #MBEDTLS_ENTROPY_MIN_PLATFORM
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* and #MBEDTLS_ENTROPY_BLOCK_SIZE.
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* It must be less or equal to
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* #MBEDTLS_ENTROPY_MAX_SEED_SIZE.
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*
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* \retval #PSA_SUCCESS
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* The seed value was injected successfully. The random generator
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* of the PSA Crypto implementation is now ready for use.
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* You may now call psa_crypto_init() and use the PSA Crypto
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* implementation.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \p seed_size is out of range.
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* \retval #PSA_ERROR_STORAGE_FAILURE
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* There was a failure reading or writing from storage.
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* \retval #PSA_ERROR_NOT_PERMITTED
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* The library has already been initialized. It is no longer
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* possible to call this function.
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*/
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psa_status_t mbedtls_psa_inject_entropy(const unsigned char *seed,
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size_t seed_size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSA_CRYPTO_EXTRA_H */
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