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psa: driver wrapper: Fix buffer allocation in case of key generation

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In case of a secure element or cryptoprocessor with
storage, when generating a key, the key material is
not exported from the secure element or cryptoprocessor
thus there is no need to allocate a buffer in that case.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2020-12-05 19:07:47 +01:00
parent 2b56bc84f5
commit 9cca31654c
1 changed files with 12 additions and 7 deletions
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19
library/psa_crypto_driver_wrappers.c
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@ -341,14 +341,19 @@ psa_status_t psa_driver_wrapper_generate_key( const psa_key_attributes_t *attrib
psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION(slot->attr.lifetime); psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION(slot->attr.lifetime);
size_t export_size = 0; size_t export_size = 0;
status = get_expected_key_size( attributes, &export_size ); /* If this is not to generate a key in a secure element or cryptoprocessor
if( status != PSA_SUCCESS ) * with storage. */
return( status );
slot->key.data = mbedtls_calloc(1, export_size);
if( slot->key.data == NULL ) if( slot->key.data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY ); {
slot->key.bytes = export_size; status = get_expected_key_size( attributes, &export_size );
if( status != PSA_SUCCESS )
return( status );
slot->key.data = mbedtls_calloc(1, export_size);
if( slot->key.data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
slot->key.bytes = export_size;
}
switch( location ) switch( location )
{ {