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Clarify usage of psa_key_policy_permits

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Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-02-25 11:29:17 +01:00
parent 16a05f5881
commit d788fab4ff
1 changed files with 6 additions and 1 deletions
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7
library/psa_crypto.c
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@ -811,6 +811,10 @@ static int psa_key_algorithm_permits( psa_algorithm_t policy_alg,
static psa_status_t psa_key_policy_permits( const psa_key_policy_t *policy,
psa_algorithm_t alg )
{
/* '0' is not a valid algorithm */
if( alg == 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
/* A requested algorithm cannot be a wildcard. */
if( PSA_ALG_IS_WILDCARD( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
@ -856,7 +860,8 @@ static psa_status_t psa_restrict_key_policy(
* and lock it.
*
* The key must have allow all the usage flags set in \p usage. If \p alg is
* nonzero, the key must allow operations with this algorithm.
* nonzero, the key must allow operations with this algorithm. If \p alg is
* zero, the algorithm is not checked.
*
* In case of a persistent key, the function loads the description of the key
* into a key slot if not already done.