41e50d26ea
The flag to mark key slots as allocated was introduced to mark slots that are claimed and in use, but do not have key material yet, at a time when creating a key used several API functions: allocate a slot, then progressively set its metadata, and finally create the key material. Now that all of these steps are combined into a single API function call, the notion of allocated-but-not-filled slot is no longer relevant. So remove the corresponding flag. A slot is occupied iff there is a key in it. (For a key in a secure element, the key material is not present, but the slot contains the key metadata.) This key must have a type which is nonzero, so use this as an indicator that a slot is in use.
168 lines
5 KiB
C
168 lines
5 KiB
C
/*
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* PSA crypto core internal interfaces
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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_CORE_H
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#define PSA_CRYPTO_CORE_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include "psa/crypto.h"
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#include "psa/crypto_se_driver.h"
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#include "mbedtls/ecp.h"
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#include "mbedtls/rsa.h"
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/** The data structure representing a key slot, containing key material
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* and metadata for one key.
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*/
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typedef struct
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{
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psa_core_key_attributes_t attr;
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union
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{
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/* Raw-data key (key_type_is_raw_bytes() in psa_crypto.c) */
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struct raw_data
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{
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uint8_t *data;
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size_t bytes;
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} raw;
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#if defined(MBEDTLS_RSA_C)
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/* RSA public key or key pair */
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mbedtls_rsa_context *rsa;
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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/* EC public key or key pair */
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mbedtls_ecp_keypair *ecp;
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#endif /* MBEDTLS_ECP_C */
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/* Any key type in a secure element */
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struct se
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{
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psa_key_slot_number_t slot_number;
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} se;
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} data;
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} psa_key_slot_t;
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/** Test whether a key slot is occupied.
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*
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* A key slot is occupied iff the key type is nonzero. This works because
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* no valid key can have 0 as its key type.
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*
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* \param[in] slot The key slot to test.
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*
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* \return 1 if the slot is occupied, 0 otherwise.
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*/
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static inline int psa_is_key_slot_occupied( const psa_key_slot_t *slot )
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{
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return( slot->attr.type != 0 );
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}
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/** Retrieve flags from psa_key_slot_t::attr::core::flags.
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*
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* \param[in] slot The key slot to query.
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* \param mask The mask of bits to extract.
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*
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* \return The key attribute flags in the given slot,
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* bitwise-anded with \p mask.
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*/
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static inline uint16_t psa_key_slot_get_flags( const psa_key_slot_t *slot,
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uint16_t mask )
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{
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return( slot->attr.flags & mask );
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}
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/** Set flags in psa_key_slot_t::attr::core::flags.
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*
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* \param[in,out] slot The key slot to modify.
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* \param mask The mask of bits to modify.
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* \param value The new value of the selected bits.
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*/
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static inline void psa_key_slot_set_flags( psa_key_slot_t *slot,
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uint16_t mask,
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uint16_t value )
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{
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slot->attr.flags = ( ( ~mask & slot->attr.flags ) |
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( mask & value ) );
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}
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/** Turn on flags in psa_key_slot_t::attr::core::flags.
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*
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* \param[in,out] slot The key slot to modify.
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* \param mask The mask of bits to set.
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*/
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static inline void psa_key_slot_set_bits_in_flags( psa_key_slot_t *slot,
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uint16_t mask )
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{
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slot->attr.flags |= mask;
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}
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/** Turn off flags in psa_key_slot_t::attr::core::flags.
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*
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* \param[in,out] slot The key slot to modify.
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* \param mask The mask of bits to clear.
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*/
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static inline void psa_key_slot_clear_bits( psa_key_slot_t *slot,
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uint16_t mask )
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{
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slot->attr.flags &= ~mask;
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}
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/** Completely wipe a slot in memory, including its policy.
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*
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* Persistent storage is not affected.
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*
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* \param[in,out] slot The key slot to wipe.
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*
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* \retval PSA_SUCCESS
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* Success. This includes the case of a key slot that was
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* already fully wiped.
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* \retval PSA_ERROR_CORRUPTION_DETECTED
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*/
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psa_status_t psa_wipe_key_slot( psa_key_slot_t *slot );
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/** Import key data into a slot.
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*
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* `slot->type` must have been set previously.
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* This function assumes that the slot does not contain any key material yet.
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* On failure, the slot content is unchanged.
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*
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* Persistent storage is not affected.
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*
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* \param[in,out] slot The key slot to import data into.
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* Its `type` field must have previously been set to
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* the desired key type.
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* It must not contain any key material yet.
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* \param[in] data Buffer containing the key material to parse and import.
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* \param data_length Size of \p data in bytes.
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*
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* \retval PSA_SUCCESS
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* \retval PSA_ERROR_INVALID_ARGUMENT
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* \retval PSA_ERROR_NOT_SUPPORTED
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* \retval PSA_ERROR_INSUFFICIENT_MEMORY
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*/
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psa_status_t psa_import_key_into_slot( psa_key_slot_t *slot,
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const uint8_t *data,
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size_t data_length );
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#endif /* PSA_CRYPTO_CORE_H */
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