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SE keys: implement persistent storage

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For a key in a secure element, persist the key slot.

This is implemented in the nominal case. Failures may not be handled
properly.
This commit is contained in:
Gilles Peskine
2019-07-23 16:13:14 +02:00
parent 0e8d495bd9
commit 1df83d4f5b
4 changed files with 80 additions and 18 deletions
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41
library/psa_crypto.c
View File

@ -1469,20 +1469,30 @@ static psa_status_t psa_finish_key_creation(
(void) driver;
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
if( slot->lifetime == PSA_KEY_LIFETIME_PERSISTENT )
if( slot->lifetime != PSA_KEY_LIFETIME_VOLATILE )
{
uint8_t *buffer = NULL;
size_t buffer_size = 0;
size_t length;
size_t length = 0;
buffer_size = PSA_KEY_EXPORT_MAX_SIZE( slot->type,
psa_get_key_slot_bits( slot ) );
buffer = mbedtls_calloc( 1, buffer_size );
if( buffer == NULL && buffer_size != 0 )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_internal_export_key( slot,
buffer, buffer_size, &length,
0 );
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
if( driver != NULL )
{
buffer = (uint8_t*) &slot->data.se.slot_number;
length = sizeof( slot->data.se.slot_number );
}
else
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
{
buffer_size = PSA_KEY_EXPORT_MAX_SIZE( slot->type,
psa_get_key_slot_bits( slot ) );
buffer = mbedtls_calloc( 1, buffer_size );
if( buffer == NULL && buffer_size != 0 )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_internal_export_key( slot,
buffer, buffer_size, &length,
0 );
}
if( status == PSA_SUCCESS )
{
@ -1491,9 +1501,14 @@ static psa_status_t psa_finish_key_creation(
status = psa_save_persistent_key( &attributes, buffer, length );
}
if( buffer_size != 0 )
mbedtls_platform_zeroize( buffer, buffer_size );
mbedtls_free( buffer );
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
if( driver == NULL )
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
{
if( buffer_size != 0 )
mbedtls_platform_zeroize( buffer, buffer_size );
mbedtls_free( buffer );
}
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */

22
library/psa_crypto_slot_management.c
View File

@ -131,10 +131,28 @@ static psa_status_t psa_load_persistent_key_into_slot( psa_key_slot_t *p_slot )
&key_data, &key_data_length );
if( status != PSA_SUCCESS )
goto exit;
p_slot->lifetime = psa_get_key_lifetime( &attributes );
p_slot->type = psa_get_key_type( &attributes );
p_slot->policy = attributes.policy;
status = psa_import_key_into_slot( p_slot,
key_data, key_data_length );
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
if( psa_key_lifetime_is_external( p_slot->lifetime ) )
{
if( key_data_length != sizeof( p_slot->data.se.slot_number ) )
{
status = PSA_ERROR_STORAGE_FAILURE;
goto exit;
}
memcpy( &p_slot->data.se.slot_number, key_data,
sizeof( p_slot->data.se.slot_number ) );
}
else
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
{
status = psa_import_key_into_slot( p_slot,
key_data, key_data_length );
}
exit:
psa_free_persistent_key_data( key_data, key_data_length );
return( status );