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https://github.com/yuzu-emu/mbedtls.git
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87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
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* PSA crypto support for secure element drivers
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*/
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/* Copyright (C) 2019, 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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#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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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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#include <assert.h>
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#include <string.h>
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#include "psa_crypto_se.h"
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typedef struct
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{
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psa_key_lifetime_t lifetime;
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const psa_drv_se_t *methods;
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} method_table_entry_t;
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static method_table_entry_t driver_table[PSA_MAX_SE_DRIVERS];
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psa_status_t psa_register_se_driver(
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psa_key_lifetime_t lifetime,
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const psa_drv_se_t *methods)
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{
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size_t i;
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if( methods->hal_version != PSA_DRV_SE_HAL_VERSION )
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return( PSA_ERROR_NOT_SUPPORTED );
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/* Driver table entries are 0-initialized. 0 is not a valid driver
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* lifetime because it means a volatile key. */
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#if defined(static_assert)
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static_assert( PSA_KEY_LIFETIME_VOLATILE == 0,
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"Secure element support requires 0 to mean a volatile key" );
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#endif
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if( lifetime == PSA_KEY_LIFETIME_VOLATILE ||
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lifetime == PSA_KEY_LIFETIME_PERSISTENT )
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{
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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for( i = 0; i < PSA_MAX_SE_DRIVERS; i++ )
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{
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if( driver_table[i].lifetime == 0 )
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break;
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/* Check that lifetime isn't already in use up to the first free
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* entry. Since entries are created in order and never deleted,
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* there can't be a used entry after the first free entry. */
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if( driver_table[i].lifetime == lifetime )
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return( PSA_ERROR_ALREADY_EXISTS );
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}
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if( i == PSA_MAX_SE_DRIVERS )
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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driver_table[i].lifetime = lifetime;
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driver_table[i].methods = methods;
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return( PSA_SUCCESS );
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}
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void psa_unregister_all_se_drivers( void )
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{
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memset( driver_table, 0, sizeof( driver_table ) );
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}
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#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
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