mbedtls/library/psa_crypto_slot_management.h

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/*
* PSA crypto layer on top of Mbed TLS crypto
*/
/* 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_SLOT_MANAGEMENT_H
#define PSA_CRYPTO_SLOT_MANAGEMENT_H
#include "psa/crypto.h"
#include "psa_crypto_se.h"
/* Number of key slots (plus one because 0 is not used).
* The value is a compile-time constant for now, for simplicity. */
#define PSA_KEY_SLOT_COUNT 32
/** Access a key slot at the given handle.
*
* \param handle Key handle to query.
* \param[out] p_slot On success, `*p_slot` contains a pointer to the
* key slot in memory designated by \p handle.
*
* \retval PSA_SUCCESS
* Success: \p handle is a handle to `*p_slot`. Note that `*p_slot`
* may be empty or occupied.
* \retval PSA_ERROR_INVALID_HANDLE
* \p handle is out of range or is not in use.
* \retval PSA_ERROR_BAD_STATE
* The library has not been initialized.
*/
psa_status_t psa_get_key_slot( psa_key_handle_t handle,
psa_key_slot_t **p_slot );
/** Initialize the key slot structures.
*
* \retval PSA_SUCCESS
* Currently this function always succeeds.
*/
psa_status_t psa_initialize_key_slots( void );
/** Delete all data from key slots in memory.
*
* This does not affect persistent storage. */
void psa_wipe_all_key_slots( void );
/** Find a free key slot.
*
* This function returns a key slot that is available for use and is in its
* ground state (all-bits-zero).
*
* \param[out] handle On success, a slot number that can be used as a
* handle to the slot.
* \param[out] p_slot On success, a pointer to the slot.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
*/
psa_status_t psa_get_empty_key_slot( psa_key_handle_t *handle,
psa_key_slot_t **p_slot );
/** Test whether a lifetime designates a key in an external cryptoprocessor.
*
* \param lifetime The lifetime to test.
*
* \retval 1
* The lifetime designates an external key. There should be a
* registered driver for this lifetime, otherwise the key cannot
* be created or manipulated.
* \retval 0
* The lifetime designates a key that is volatile or in internal
* storage.
*/
static inline int psa_key_lifetime_is_external( psa_key_lifetime_t lifetime )
{
return( lifetime != PSA_KEY_LIFETIME_VOLATILE &&
lifetime != PSA_KEY_LIFETIME_PERSISTENT );
}
/** Test whether the given parameters are acceptable for a persistent key.
*
* This function does not access the storage in any way. It only tests
* whether the parameters are meaningful and permitted by general policy.
* It does not test whether the a file by the given id exists or could be
* created.
*
* If the key is in external storage, this function returns the corresponding
* driver.
*
* \param lifetime The lifetime to test.
* \param id The key id to test.
* \param[out] p_drv On output, if \p lifetime designates a key
* in an external processor, \c *p_drv is a pointer
* to the driver table entry fot this lifetime.
* If \p lifetime designates a transparent key,
* \c *p_drv is \c NULL.
* \param creating 0 if attempting to open an existing key.
* Nonzero if attempting to create a key.
*
* \retval PSA_SUCCESS
* The given parameters are valid.
* \retval PSA_ERROR_INVALID_ARGUMENT
* \p lifetime is volatile or is invalid.
* \retval PSA_ERROR_INVALID_ARGUMENT
* \p id is invalid.
*/
psa_status_t psa_validate_persistent_key_parameters(
psa_key_lifetime_t lifetime,
psa_key_file_id_t id,
psa_se_drv_table_entry_t **p_drv,
int creating );
#endif /* PSA_CRYPTO_SLOT_MANAGEMENT_H */