Hi, I am trying to calculate a AES-128 CMAC using the PSA crypto libraries but running into some issues.
Are there any sample code that I can reference to implement this?
Currently I am doing the following:
psa_key_id_t key_id;
psa_key_attributes_t keyAttributes = PSA_KEY_ATTRIBUTES_INIT;
size_t mac_length;
psa_set_key_usage_flags ( &keyAttributes, ( PSA_KEY_USAGE_SIGN_MESSAGE ) );
psa_set_key_lifetime ( &keyAttributes, PSA_KEY_LIFETIME_VOLATILE );
psa_set_key_algorithm ( &keyAttributes, PSA_ALG_CMAC );
psa_set_key_type ( &keyAttributes, PSA_KEY_TYPE_AES );
psa_set_key_bits ( &keyAttributes, 128 );
psa_import_key( &keyAttributes, inKey, 16, &key_id );
psa_mac_compute(
key_id,
PSA_ALG_CMAC,
inData,
dataLen,
(uint8_t *) outData,
16,
&mac_length);
where:
- inKey is the raw key in bytes
- inData is the input message
- outData is the buffer where the MAC value is to be written
-
dataLen is the length of the input message
For some reason I get the following message printed to the console: * buffer overflow detected *
Is this the right way to calculate the CMAC? Is there a different that is recommended?
Thanks
