from functools import reduce


def bitList32ToList4(lst):
    """Convert a 32-bit list into a 4-byte list"""
    def bitListToInt(lst):
        return reduce(lambda x,y:(x<<1)+y,lst)    
     
    lst2 = []
    for i in range(0,len(lst),8):
        lst2.append(bitListToInt(lst[i:i+8]))
    return list([0]*(4-len(lst2)))+lst2