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psa: mac: Introduce psa_mac_compute_internal

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Introduce psa_mac_compute_internal with an
additional `is_sign` parameter compared to
the psa_mac_compute API. The intent is to
call psa_mac_compute_internal() from
psa_mac_verify() as well to compute the
message MAC.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2021-06-18 14:23:33 +02:00
parent 93dcd5963f
commit ef0d8f17f8
1 changed files with 24 additions and 8 deletions
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32
library/psa_crypto.c
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@ -2512,13 +2512,14 @@ cleanup:
return( status == PSA_SUCCESS ? abort_status : status );
}
psa_status_t psa_mac_compute( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *mac,
size_t mac_size,
size_t *mac_length)
static psa_status_t psa_mac_compute_internal( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *mac,
size_t mac_size,
size_t *mac_length,
int is_sign )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
@ -2526,7 +2527,9 @@ psa_status_t psa_mac_compute( mbedtls_svc_key_id_t key,
uint8_t operation_mac_size = 0;
status = psa_get_and_lock_key_slot_with_policy(
key, &slot, PSA_KEY_USAGE_SIGN_HASH, alg );
key, &slot,
is_sign ? PSA_KEY_USAGE_SIGN_HASH : PSA_KEY_USAGE_VERIFY_HASH,
alg );
if( status != PSA_SUCCESS )
goto exit;
@ -2572,6 +2575,19 @@ exit:
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
psa_status_t psa_mac_compute( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *mac,
size_t mac_size,
size_t *mac_length)
{
return( psa_mac_compute_internal( key, alg,
input, input_length,
mac, mac_size, mac_length, 1 ) );
}
psa_status_t psa_mac_verify( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,