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Explain some non-obvious parts of the code

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Comment changes only.
This commit is contained in:
Gilles Peskine 2019-07-24 15:56:01 +02:00
parent f96aefe3ad
commit 75c126b958
1 changed files with 11 additions and 0 deletions
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11
library/psa_crypto_se.c
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@ -81,6 +81,10 @@ psa_se_drv_table_entry_t *psa_get_se_driver_entry(
psa_key_lifetime_t lifetime ) psa_key_lifetime_t lifetime )
{ {
size_t i; size_t i;
/* In the driver table, lifetime=0 means an entry that isn't used.
* No driver has a lifetime of 0 because it's a reserved value
* (which designates volatile keys). Make sure we never return
* a driver entry for lifetime 0. */
if( lifetime == 0 ) if( lifetime == 0 )
return( NULL ); return( NULL );
for( i = 0; i < PSA_MAX_SE_DRIVERS; i++ ) for( i = 0; i < PSA_MAX_SE_DRIVERS; i++ )
@ -134,6 +138,7 @@ static psa_status_t psa_get_se_driver_its_file_uid(
return( PSA_ERROR_NOT_SUPPORTED ); return( PSA_ERROR_NOT_SUPPORTED );
#endif #endif
/* See the documentation of PSA_CRYPTO_SE_DRIVER_ITS_UID_BASE. */
*uid = PSA_CRYPTO_SE_DRIVER_ITS_UID_BASE + driver->lifetime; *uid = PSA_CRYPTO_SE_DRIVER_ITS_UID_BASE + driver->lifetime;
return( PSA_SUCCESS ); return( PSA_SUCCESS );
} }
@ -148,6 +153,9 @@ psa_status_t psa_load_se_persistent_data(
if( status != PSA_SUCCESS ) if( status != PSA_SUCCESS )
return( status ); return( status );
/* psa_get_se_driver_its_file_uid ensures that the size_t
* persistent_data_size is in range, but compilers don't know that,
* so cast to reassure them. */
return( psa_its_get( uid, 0, return( psa_its_get( uid, 0,
(uint32_t) driver->internal.persistent_data_size, (uint32_t) driver->internal.persistent_data_size,
driver->internal.persistent_data ) ); driver->internal.persistent_data ) );
@ -163,6 +171,9 @@ psa_status_t psa_save_se_persistent_data(
if( status != PSA_SUCCESS ) if( status != PSA_SUCCESS )
return( status ); return( status );
/* psa_get_se_driver_its_file_uid ensures that the size_t
* persistent_data_size is in range, but compilers don't know that,
* so cast to reassure them. */
return( psa_its_set( uid, return( psa_its_set( uid,
(uint32_t) driver->internal.persistent_data_size, (uint32_t) driver->internal.persistent_data_size,
driver->internal.persistent_data, driver->internal.persistent_data,