/**
* \file psa/crypto_extra.h
*
* \brief PSA cryptography module: Mbed TLS vendor extensions
*
* \note This file may not be included directly. Applications must
* include psa/crypto.h.
*
* This file is reserved for vendor-specific definitions.
*/
/*
* 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_EXTRA_H
#define PSA_CRYPTO_EXTRA_H
#include "mbedtls/platform_util.h"
#ifdef __cplusplus
extern "C" {
#endif
/* UID for secure storage seed */
#define PSA_CRYPTO_ITS_RANDOM_SEED_UID 0xFFFFFF52
/*
* Deprecated PSA Crypto error code definitions
*/
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#define PSA_ERROR_UNKNOWN_ERROR \
MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_GENERIC_ERROR )
#endif
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#define PSA_ERROR_OCCUPIED_SLOT \
MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_ALREADY_EXISTS )
#endif
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#define PSA_ERROR_EMPTY_SLOT \
MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_DOES_NOT_EXIST )
#endif
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#define PSA_ERROR_INSUFFICIENT_CAPACITY \
MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_INSUFFICIENT_DATA )
#endif
/** \addtogroup policy
* @{
*/
/** \brief Set the enrollment algorithm in a key policy.
*
* An operation on a key may indifferently use the algorithm set with
* psa_key_policy_set_usage() or with this function.
*
* \param[in,out] policy The key policy to modify. It must have been
* initialized as per the documentation for
* #psa_key_policy_t.
* \param alg2 A second algorithm that the key may be used for,
* in addition to the algorithm set with
* psa_key_policy_set_usage().
*
* \warning Setting an enrollment algorithm is not recommended, because
* using the same key with different algorithms can allow some
* attacks based on arithmetic relations between different
* computations made with the same key, or can escalate harmless
* side channels into exploitable ones. Use this function only
* if it is necessary to support a protocol for which it has been
* verified that the usage of the key with multiple algorithms
* is safe.
*/
void psa_key_policy_set_enrollment_algorithm(psa_key_policy_t *policy,
psa_algorithm_t alg2);
/** \brief Retrieve the enrollment algorithm field of a policy structure.
*
* \param[in] policy The policy object to query.
*
* \return The enrollment algorithm for a key with this policy.
*/
psa_algorithm_t psa_key_policy_get_enrollment_algorithm(
const psa_key_policy_t *policy);
/**@}*/
/**
* \brief Library deinitialization.
*
* This function clears all data associated with the PSA layer,
* including the whole key store.
*
* This is an Mbed TLS extension.
*/
void mbedtls_psa_crypto_free( void );
/**
* \brief Inject an initial entropy seed for the random generator into
* secure storage.
*
* This function injects data to be used as a seed for the random generator
* used by the PSA Crypto implementation. On devices that lack a trusted
* entropy source (preferably a hardware random number generator),
* the Mbed PSA Crypto implementation uses this value to seed its
* random generator.
*
* On devices without a trusted entropy source, this function must be
* called exactly once in the lifetime of the device. On devices with
* a trusted entropy source, calling this function is optional.
* In all cases, this function may only be called before calling any
* other function in the PSA Crypto API, including psa_crypto_init().
*
* When this function returns successfully, it populates a file in
* persistent storage. Once the file has been created, this function
* can no longer succeed.
*
* If any error occurs, this function does not change the system state.
* You can call this function again after correcting the reason for the
* error if possible.
*
* \warning This function **can** fail! Callers MUST check the return status.
*
* \warning If you use this function, you should use it as part of a
* factory provisioning process. The value of the injected seed
* is critical to the security of the device. It must be
* *secret*, *unpredictable* and (statistically) *unique per device*.
* You should be generate it randomly using a cryptographically
* secure random generator seeded from trusted entropy sources.
* You should transmit it securely to the device and ensure
* that its value is not leaked or stored anywhere beyond the
* needs of transmitting it from the point of generation to
* the call of this function, and erase all copies of the value
* once this function returns.
*
* This is an Mbed TLS extension.
*
* \note This function is only available on the following platforms:
* * If the compile-time option MBEDTLS_PSA_INJECT_ENTROPY is enabled.
* Note that you must provide compatible implementations of
* mbedtls_nv_seed_read and mbedtls_nv_seed_write.
* * In a client-server integration of PSA Cryptography, on the client side,
* if the server supports this feature.
* \param[in] seed Buffer containing the seed value to inject.
* \param[in] seed_size Size of the \p seed buffer.
* The size of the seed in bytes must be greater
* or equal to both #MBEDTLS_ENTROPY_MIN_PLATFORM
* and #MBEDTLS_ENTROPY_BLOCK_SIZE.
* It must be less or equal to
* #MBEDTLS_ENTROPY_MAX_SEED_SIZE.
*
* \retval #PSA_SUCCESS
* The seed value was injected successfully. The random generator
* of the PSA Crypto implementation is now ready for use.
* You may now call psa_crypto_init() and use the PSA Crypto
* implementation.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p seed_size is out of range.
* \retval #PSA_ERROR_STORAGE_FAILURE
* There was a failure reading or writing from storage.
* \retval #PSA_ERROR_NOT_PERMITTED
* The library has already been initialized. It is no longer
* possible to call this function.
*/
psa_status_t mbedtls_psa_inject_entropy(const unsigned char *seed,
size_t seed_size);
#ifdef __cplusplus
}
#endif
#endif /* PSA_CRYPTO_EXTRA_H */