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由于.net升级后，CryptoStream的行为更加规范，CryptoStream 内部以“加密块”为单位进行解密，它一次只解密一个完整的块（例如 DES/3DES 块大小为 8 字节），即使底层数据流有更多数据，它也不会一次性全部读取。
单元测试中用的 var srcString = "test DES encrypt"; 正好满足块大小为 8 字节，测试可以通过。
修改为var srcString = "test DES encrypt -t";后测试失败，原始字符串通过DESEncrypt后再进行DESDecrypt，并不能得到原始字符串
错误是由于使用了cryptoStream.Read方法，改为使用cryptoStream.CopyTo(outputStream)进行修复