225 lines
7.9 KiB
C
225 lines
7.9 KiB
C
/*
|
|
* PSA crypto layer on top of Mbed TLS crypto
|
|
*/
|
|
/*
|
|
* Copyright The Mbed TLS Contributors
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef PSA_CRYPTO_SLOT_MANAGEMENT_H
|
|
#define PSA_CRYPTO_SLOT_MANAGEMENT_H
|
|
|
|
#include "psa/crypto.h"
|
|
#include "psa_crypto_core.h"
|
|
#include "psa_crypto_se.h"
|
|
|
|
/** Range of volatile key identifiers.
|
|
*
|
|
* The last #MBEDTLS_PSA_KEY_SLOT_COUNT identifiers of the implementation
|
|
* range of key identifiers are reserved for volatile key identifiers.
|
|
* A volatile key identifier is equal to #PSA_KEY_ID_VOLATILE_MIN plus the
|
|
* index of the key slot containing the volatile key definition.
|
|
*/
|
|
|
|
/** The minimum value for a volatile key identifier.
|
|
*/
|
|
#define PSA_KEY_ID_VOLATILE_MIN ( PSA_KEY_ID_VENDOR_MAX - \
|
|
MBEDTLS_PSA_KEY_SLOT_COUNT + 1 )
|
|
|
|
/** The maximum value for a volatile key identifier.
|
|
*/
|
|
#define PSA_KEY_ID_VOLATILE_MAX PSA_KEY_ID_VENDOR_MAX
|
|
|
|
/** Test whether a key identifier is a volatile key identifier.
|
|
*
|
|
* \param key_id Key identifier to test.
|
|
*
|
|
* \retval 1
|
|
* The key identifier is a volatile key identifier.
|
|
* \retval 0
|
|
* The key identifier is not a volatile key identifier.
|
|
*/
|
|
static inline int psa_key_id_is_volatile( psa_key_id_t key_id )
|
|
{
|
|
return( ( key_id >= PSA_KEY_ID_VOLATILE_MIN ) &&
|
|
( key_id <= PSA_KEY_ID_VOLATILE_MAX ) );
|
|
}
|
|
|
|
/** Get the description of a key given its identifier and lock it.
|
|
*
|
|
* The descriptions of volatile keys and loaded persistent keys are stored in
|
|
* key slots. This function returns a pointer to the key slot containing the
|
|
* description of a key given its identifier.
|
|
*
|
|
* In case of a persistent key, the function loads the description of the key
|
|
* into a key slot if not already done.
|
|
*
|
|
* On success, the returned key slot is locked. It is the responsibility of
|
|
* the caller to unlock the key slot when it does not access it anymore.
|
|
*
|
|
* \param key Key identifier to query.
|
|
* \param[out] p_slot On success, `*p_slot` contains a pointer to the
|
|
* key slot containing the description of the key
|
|
* identified by \p key.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \p *p_slot contains a pointer to the key slot containing the
|
|
* description of the key identified by \p key.
|
|
* The key slot counter has been incremented.
|
|
* \retval #PSA_ERROR_BAD_STATE
|
|
* The library has not been initialized.
|
|
* \retval #PSA_ERROR_INVALID_HANDLE
|
|
* \p key is not a valid key identifier.
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
* \p key is a persistent key identifier. The implementation does not
|
|
* have sufficient resources to load the persistent key. This can be
|
|
* due to a lack of empty key slot, or available memory.
|
|
* \retval #PSA_ERROR_DOES_NOT_EXIST
|
|
* There is no key with key identifier \p key.
|
|
* \retval #PSA_ERROR_CORRUPTION_DETECTED
|
|
* \retval #PSA_ERROR_STORAGE_FAILURE
|
|
* \retval #PSA_ERROR_DATA_CORRUPT
|
|
*/
|
|
psa_status_t psa_get_and_lock_key_slot( mbedtls_svc_key_id_t key,
|
|
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). On success, the key slot is locked. It is
|
|
* the responsibility of the caller to unlock the key slot when it does not
|
|
* access it anymore.
|
|
*
|
|
* \param[out] volatile_key_id On success, volatile key identifier
|
|
* associated to the returned 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_id_t *volatile_key_id,
|
|
psa_key_slot_t **p_slot );
|
|
|
|
/** Lock a key slot.
|
|
*
|
|
* This function increments the key slot lock counter by one.
|
|
*
|
|
* \param[in] slot The key slot.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
The key slot lock counter was incremented.
|
|
* \retval #PSA_ERROR_CORRUPTION_DETECTED
|
|
* The lock counter already reached its maximum value and was not
|
|
* increased.
|
|
*/
|
|
static inline psa_status_t psa_lock_key_slot( psa_key_slot_t *slot )
|
|
{
|
|
if( slot->lock_count >= SIZE_MAX )
|
|
return( PSA_ERROR_CORRUPTION_DETECTED );
|
|
|
|
slot->lock_count++;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Unlock a key slot.
|
|
*
|
|
* This function decrements the key slot lock counter by one.
|
|
*
|
|
* \note To ease the handling of errors in retrieving a key slot
|
|
* a NULL input pointer is valid, and the function returns
|
|
* successfully without doing anything in that case.
|
|
*
|
|
* \param[in] slot The key slot.
|
|
* \retval #PSA_SUCCESS
|
|
* \p slot is NULL or the key slot lock counter has been
|
|
* decremented successfully.
|
|
* \retval #PSA_ERROR_CORRUPTION_DETECTED
|
|
* The lock counter was equal to 0.
|
|
*
|
|
*/
|
|
psa_status_t psa_unlock_key_slot( psa_key_slot_t *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( PSA_KEY_LIFETIME_GET_LOCATION( lifetime )
|
|
!= PSA_KEY_LOCATION_LOCAL_STORAGE );
|
|
}
|
|
|
|
/** Validate a key's location.
|
|
*
|
|
* This function checks whether the key's attributes point to a location that
|
|
* is known to the PSA Core, and returns the driver function table if the key
|
|
* is to be found in an external location.
|
|
*
|
|
* \param[in] lifetime The key lifetime attribute.
|
|
* \param[out] p_drv On success, when a key is located in external
|
|
* storage, returns a pointer to the driver table
|
|
* associated with the key's storage location.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
*/
|
|
psa_status_t psa_validate_key_location( psa_key_lifetime_t lifetime,
|
|
psa_se_drv_table_entry_t **p_drv );
|
|
|
|
/** Validate the persistence of a key.
|
|
*
|
|
* \param[in] lifetime The key lifetime attribute.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED The key is persistent but persistent keys
|
|
* are not supported.
|
|
*/
|
|
psa_status_t psa_validate_key_persistence( psa_key_lifetime_t lifetime );
|
|
|
|
/** Validate a key identifier.
|
|
*
|
|
* \param[in] key The key identifier.
|
|
* \param[in] vendor_ok Non-zero to indicate that key identifiers in the
|
|
* vendor range are allowed, volatile key identifiers
|
|
* excepted \c 0 otherwise.
|
|
*
|
|
* \retval <> 0 if the key identifier is valid, 0 otherwise.
|
|
*/
|
|
int psa_is_valid_key_id( mbedtls_svc_key_id_t key, int vendor_ok );
|
|
|
|
#endif /* PSA_CRYPTO_SLOT_MANAGEMENT_H */
|