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Communication Mode

Source code in src/desfire/enums/desfire_communication_mode.py 
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class DESFireCommunicationMode(Enum):
    PLAIN = 0x00
    """
    - **TX**: CMAC needs to be calculated to update the IV, but CMAC is not appended
    - **RX**: No impact
    """

    CMAC = 0x01
    """
    - **TX**: CMAC needs to be calculated to update the IV, and CMAC is appended
    - **RX**: CMAC is attached to the data and needs to be verified
    """

    ENCRYPTED = 0x03
    """
    - **TX**: CRC creation + data encryption
    - **RX**: Data decryption + CRC verification
    """

CMAC class-attribute instance-attribute 

CMAC = 1
  • TX: CMAC needs to be calculated to update the IV, and CMAC is appended
  • RX: CMAC is attached to the data and needs to be verified

ENCRYPTED class-attribute instance-attribute 

ENCRYPTED = 3
  • TX: CRC creation + data encryption
  • RX: Data decryption + CRC verification

PLAIN class-attribute instance-attribute 

PLAIN = 0
  • TX: CMAC needs to be calculated to update the IV, but CMAC is not appended
  • RX: No impact