Returns the extended device ECC-B233 key (0x50 bytes) from [[Calibration#CAL0|CAL0]]. If the extended key is not programmed then it falls back to the normal device ECC-B233 key (0x30 bytes). | Returns the extended device ECC-B233 key (0x50 bytes) from [[Calibration#CAL0|CAL0]]. If the extended key is not programmed then it falls back to the normal device ECC-B233 key (0x30 bytes). |