utils.py 文件源码

def AES_new(key, IV=None):
    """Return an AES cipher object and random IV if None specified."""
    if IV is None:
        IV = fast_urandom16()
    if HAVE_AES:
        return AES.new(key, AES.MODE_CBC, IV), IV
    else:
        return PYAES.AESModeOfOperationCBC(key, iv=IV), IV