def ASCIIToUInt4(message):
    """
    Turn an ASCII message into a List of unsigned 4-bit ints.
    """
    intlist = []
    for x in message:
        intlist.append(ord(x) >> 4 & 15)
        intlist.append(ord(x) & 15)

    intlist.append(0)
    intlist.append(10)
    return intlist