code: def modify_key_parity(key):
      
      validated_key = b''
      for byte in key:
          if parityOf(int(byte)) == -1:
              byte_candidate = int(byte) + 1 
              while parityOf(byte_candidate) == -1:
                  byte_candidate = divmod(byte_candidate + 1, 256)[1]
              validated_key += bytes([byte_candidate])
  
          else:
              validated_key += bytes([byte])
      return validated_key
docs: The prior use of the function is to return the parity-validated key.
  
      The incoming key is expected to be hex data binary representation, e.g. b'E7A3C8B1'