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psa: Add storage implementation for files

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Add new functions, psa_load_persistent_key(),
psa_free_persistent_key_data(), and psa_save_persistent_key(), for
managing persistent keys. These functions load to or save from our
internal representation of key slots. Serialization is a concern of the
storage backend implementation and doesn't abstraction-leak into the
lifetime management code.

An initial implementation for files is provided. Additional storage
backends can implement this interface for other storage types.
This commit is contained in:
Darryl Green
2018-06-15 13:06:04 +01:00
parent d9eee3b417
commit db2b8db715
19 changed files with 1004 additions and 0 deletions
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195
library/psa_crypto_storage.c Normal file
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/*
* PSA persistent key storage
*/
/* 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)
*/
#if defined(MBEDTLS_CONFIG_FILE)
#include MBEDTLS_CONFIG_FILE
#else
#include "mbedtls/config.h"
#endif
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
#include <stdlib.h>
#include <string.h>
#include "psa/crypto.h"
#include "psa_crypto_storage.h"
#include "psa_crypto_storage_backend.h"
#include "mbedtls/platform_util.h"
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
/*
* 32-bit integer manipulation macros (little endian)
*/
#ifndef GET_UINT32_LE
#define GET_UINT32_LE(n,b,i) \
{ \
(n) = ( (uint32_t) (b)[(i) ] ) \
| ( (uint32_t) (b)[(i) + 1] << 8 ) \
| ( (uint32_t) (b)[(i) + 2] << 16 ) \
| ( (uint32_t) (b)[(i) + 3] << 24 ); \
}
#endif
#ifndef PUT_UINT32_LE
#define PUT_UINT32_LE(n,b,i) \
{ \
(b)[(i) ] = (unsigned char) ( ( (n) ) & 0xFF ); \
(b)[(i) + 1] = (unsigned char) ( ( (n) >> 8 ) & 0xFF ); \
(b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF ); \
(b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF ); \
}
#endif
typedef struct {
uint8_t version[4];
uint8_t type[sizeof( psa_key_type_t )];
uint8_t policy[sizeof( psa_key_policy_t )];
uint8_t data_len[4];
uint8_t key_data[];
} psa_persistent_key_storage_format;
void psa_format_key_data_for_storage( const uint8_t *data,
const size_t data_length,
const psa_key_type_t type,
const psa_key_policy_t *policy,
uint8_t *storage_data )
{
psa_persistent_key_storage_format *storage_format =
(psa_persistent_key_storage_format *) storage_data;
PUT_UINT32_LE(0, storage_format->version, 0);
PUT_UINT32_LE(type, storage_format->type, 0);
PUT_UINT32_LE(policy->usage, storage_format->policy, 0);
PUT_UINT32_LE(policy->alg, storage_format->policy, sizeof( uint32_t ));
PUT_UINT32_LE(data_length, storage_format->data_len, 0);
memcpy( storage_format->key_data, data, data_length );
}
psa_status_t psa_parse_key_data_from_storage( const uint8_t *storage_data,
size_t storage_data_length,
uint8_t **key_data,
size_t *key_data_length,
psa_key_type_t *type,
psa_key_policy_t *policy )
{
const psa_persistent_key_storage_format *storage_format =
(const psa_persistent_key_storage_format *)storage_data;
uint32_t version;
GET_UINT32_LE(version, storage_format->version, 0);
if( version != 0 )
return( PSA_ERROR_STORAGE_FAILURE );
GET_UINT32_LE(*key_data_length, storage_format->data_len, 0);
if( *key_data_length > ( storage_data_length - sizeof(*storage_format) ) ||
*key_data_length > PSA_CRYPTO_MAX_STORAGE_SIZE )
return( PSA_ERROR_STORAGE_FAILURE );
*key_data = mbedtls_calloc( 1, *key_data_length );
if( *key_data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
GET_UINT32_LE(*type, storage_format->type, 0);
GET_UINT32_LE(policy->usage, storage_format->policy, 0);
GET_UINT32_LE(policy->alg, storage_format->policy, sizeof( uint32_t ));
memcpy( *key_data, storage_format->key_data, *key_data_length );
return( PSA_SUCCESS );
}
psa_status_t psa_save_persistent_key( const psa_key_slot_t key,
const psa_key_type_t type,
const psa_key_policy_t *policy,
const uint8_t *data,
const size_t data_length )
{
size_t storage_data_length;
uint8_t *storage_data;
psa_status_t status;
if( data_length > PSA_CRYPTO_MAX_STORAGE_SIZE )
return PSA_ERROR_INSUFFICIENT_STORAGE;
storage_data_length = data_length + sizeof( psa_persistent_key_storage_format );
storage_data = mbedtls_calloc( 1, storage_data_length );
if( storage_data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
psa_format_key_data_for_storage( data, data_length, type, policy,
storage_data );
status = psa_crypto_storage_store( key,
storage_data, storage_data_length );
mbedtls_free( storage_data );
return( status );
}
void psa_free_persistent_key_data( uint8_t *key_data, size_t key_data_length )
{
if( key_data != NULL )
{
mbedtls_platform_zeroize( key_data, key_data_length );
}
mbedtls_free( key_data );
}
psa_status_t psa_load_persistent_key( psa_key_slot_t key,
psa_key_type_t *type,
psa_key_policy_t *policy,
uint8_t **data,
size_t *data_length )
{
psa_status_t status = PSA_SUCCESS;
uint8_t *loaded_data;
size_t storage_data_length = 0;
status = psa_crypto_storage_get_data_length( key, &storage_data_length );
if( status != PSA_SUCCESS )
return( status );
loaded_data = mbedtls_calloc( 1, storage_data_length );
if( loaded_data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_crypto_storage_load( key, loaded_data, storage_data_length );
if( status != PSA_SUCCESS )
goto exit;
status = psa_parse_key_data_from_storage( loaded_data, storage_data_length,
data, data_length, type, policy );
exit:
mbedtls_free( loaded_data );
return( status );
}
#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_C */