def word_to_col(w):
    """Splits a hexadecimal string to a bytes column.

    Parameters
    ----------
    w : str
        Hexadecimal 32-bit word.

    Returns
    -------
    list
        4 bytes column containing integers representing the input string.

    """
    x = int(w, 16)
    return [x >> 24, (x >> 16) & 0xff, (x >> 8) & 0xff, x & 0xff]