To implement CTS encryption or decryption for data of unknown length, the implementation must delay processing (and buffer) the two most recent blocks of data, so that they can be properly processed at the end of the data stream.
为了对未知长度的数据实现 CTS 加密或解密，必须延迟处理(和缓存)最新的两个数据块，以便在数据流末端进行适当的处理。