question: OathDeviceSettings createDeviceProfile ( int minSharedSecretLength ) { Reject . ifFalse ( minSharedSecretLength >= 0 , "minSharedSecretLength must not be negative" ) ; int sharedSecretByteLength = Math . max ( MIN_SHARED_SECRET_BYTE_LENGTH , ( int ) Math . ceil ( minSharedSecretLength / 2d ) ) ; byte [ ] secretBytes = new byte [ sharedSecretByteLength ] ; secureRandom . nextBytes ( secretBytes ) ; String sharedSecret = DatatypeConverter . printHexBinary ( secretBytes ) ; return new OathDeviceSettings ( sharedSecret , DEVICE_NAME , INITIAL_LAST_LOGIN_TIME , INITIAL_COUNTER_VALUE ) ; }
target:  Creates and saves a fresh device profile for the given user. This will generate a fresh random shared secret for the device, and initialise the counter and last login times to 0, ensuring a valid device profile is present for device registration.