HashFirmware returns the hash of `<firmware version><firmware>`, as computed by the bootloader to check the firmware signature.

NewDevice creates a new instance of Device.

ParseSignedFirmware parses a signed firmware file and returns (sigdata, firmware).

Device provides the API to communicate with the BitBox02 bootloader.

Status has all the info to handle the bootloader mode.

Communication contains functions needed to communicate with the device.