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Use a key attribute structure in the internal storage interface

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Pass information via a key attribute structure rather than as separate
parameters to psa_crypto_storage functions. This makes it easier to
maintain the code when the metadata of a key evolves.

This has negligible impact on code size (+4B with "gcc -Os" on x86_64).
This commit is contained in:
Gilles Peskine
2019-07-23 11:58:03 +02:00
parent 274a2637f2
commit bfd322ff34
5 changed files with 76 additions and 70 deletions
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27
library/psa_crypto.c
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@ -1100,6 +1100,22 @@ exit:
}
#endif /* MBEDTLS_RSA_C */
/** Retrieve the readily-accessible attributes of a key in a slot.
*
* This function does not compute attributes that are not directly
* stored in the slot, such as the bit size of a transparent key.
*/
static void psa_get_key_slot_attributes( psa_key_slot_t *slot,
psa_key_attributes_t *attributes )
{
attributes->id = slot->persistent_storage_id;
attributes->lifetime = slot->lifetime;
attributes->policy = slot->policy;
attributes->type = slot->type;
}
/** Retrieve all the publicly-accessible attributes of a key.
*/
psa_status_t psa_get_key_attributes( psa_key_handle_t handle,
psa_key_attributes_t *attributes )
{
@ -1112,10 +1128,7 @@ psa_status_t psa_get_key_attributes( psa_key_handle_t handle,
if( status != PSA_SUCCESS )
return( status );
attributes->id = slot->persistent_storage_id;
attributes->lifetime = slot->lifetime;
attributes->policy = slot->policy;
attributes->type = slot->type;
psa_get_key_slot_attributes( slot, attributes );
attributes->bits = psa_get_key_slot_bits( slot );
switch( slot->type )
@ -1473,9 +1486,9 @@ static psa_status_t psa_finish_key_creation(
if( status == PSA_SUCCESS )
{
status = psa_save_persistent_key( slot->persistent_storage_id,
slot->type, &slot->policy,
buffer, length );
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_get_key_slot_attributes( slot, &attributes );
status = psa_save_persistent_key( &attributes, buffer, length );
}
if( buffer_size != 0 )