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Declare key id 0 as invalid

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In keeping with other integral types, declare 0 to be an invalid key
identifier.

Documented, implemented and tested.
This commit is contained in:
Gilles Peskine 2019-05-15 18:42:09 +02:00
parent f9666595e1
commit f9fbc38e66
4 changed files with 18 additions and 11 deletions
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15
library/psa_crypto_slot_management.c
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@ -185,15 +185,14 @@ static int psa_is_key_id_valid( psa_key_file_id_t file_id,
int vendor_ok )
{
psa_app_key_id_t key_id = PSA_KEY_FILE_GET_KEY_ID( file_id );
/* Reject high values because the file names are reserved for the
* library's internal use. */
if( key_id > PSA_MAX_PERSISTENT_KEY_IDENTIFIER )
if( PSA_KEY_ID_USER_MIN <= key_id && key_id <= PSA_KEY_ID_USER_MAX )
return( 1 );
else if( vendor_ok &&
PSA_KEY_ID_VENDOR_MIN <= key_id &&
key_id <= PSA_KEY_ID_VENDOR_MAX )
return( 1 );
else
return( 0 );
/* Applications may only create keys in the range
* 0..PSA_KEY_ID_USER_MAX. */
if( ! vendor_ok && key_id > PSA_KEY_ID_USER_MAX )
return( 0 );
return( 1 );
}
/** Declare a slot as persistent and load it from storage.