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psa: slot mgmt: Don't use handles to loop through slot array

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2020-07-24 16:33:11 +02:00
parent 2a99315cc5
commit 98a54ddbd6
1 changed files with 16 additions and 9 deletions
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25
library/psa_crypto_slot_management.c
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@ -104,10 +104,11 @@ psa_status_t psa_initialize_key_slots( void )
void psa_wipe_all_key_slots( void ) void psa_wipe_all_key_slots( void )
{ {
psa_key_handle_t key; size_t slot_idx;
for( key = 1; key <= PSA_KEY_SLOT_COUNT; key++ )
for( slot_idx = 0; slot_idx < PSA_KEY_SLOT_COUNT; slot_idx++ )
{ {
psa_key_slot_t *slot = &global_data.key_slots[key - 1]; psa_key_slot_t *slot = &global_data.key_slots[ slot_idx ];
(void) psa_wipe_key_slot( slot ); (void) psa_wipe_key_slot( slot );
} }
global_data.key_slots_initialized = 0; global_data.key_slots_initialized = 0;
@ -117,15 +118,19 @@ psa_status_t psa_get_empty_key_slot( psa_key_handle_t *handle,
psa_key_id_t *volatile_key_id, psa_key_id_t *volatile_key_id,
psa_key_slot_t **p_slot ) psa_key_slot_t **p_slot )
{ {
size_t slot_idx;
if( ! global_data.key_slots_initialized ) if( ! global_data.key_slots_initialized )
return( PSA_ERROR_BAD_STATE ); return( PSA_ERROR_BAD_STATE );
for( *handle = PSA_KEY_SLOT_COUNT; *handle != 0; --( *handle ) ) for( slot_idx = PSA_KEY_SLOT_COUNT; slot_idx > 0; slot_idx-- )
{ {
*p_slot = &global_data.key_slots[*handle - 1]; *p_slot = &global_data.key_slots[ slot_idx - 1 ];
if( ! psa_is_key_slot_occupied( *p_slot ) ) if( ! psa_is_key_slot_occupied( *p_slot ) )
{ {
*volatile_key_id = PSA_KEY_ID_VOLATILE_MIN + ( *handle ) - 1; *handle = (psa_key_handle_t)slot_idx;
*volatile_key_id = PSA_KEY_ID_VOLATILE_MIN +
( (psa_key_id_t)slot_idx ) - 1;
return( PSA_SUCCESS ); return( PSA_SUCCESS );
} }
@ -268,11 +273,13 @@ psa_status_t psa_close_key( psa_key_handle_t handle )
void mbedtls_psa_get_stats( mbedtls_psa_stats_t *stats ) void mbedtls_psa_get_stats( mbedtls_psa_stats_t *stats )
{ {
psa_key_handle_t key; size_t slot_idx;
memset( stats, 0, sizeof( *stats ) ); memset( stats, 0, sizeof( *stats ) );
for( key = 1; key <= PSA_KEY_SLOT_COUNT; key++ )
for( slot_idx = 0; slot_idx < PSA_KEY_SLOT_COUNT; slot_idx++ )
{ {
const psa_key_slot_t *slot = &global_data.key_slots[key - 1]; const psa_key_slot_t *slot = &global_data.key_slots[ slot_idx ];
if( ! psa_is_key_slot_occupied( slot ) ) if( ! psa_is_key_slot_occupied( slot ) )
{ {
++stats->empty_slots; ++stats->empty_slots;