如何强制CipherOutputStream完成加密，但是将基础流打开？ [英] How can I force a CipherOutputStream to finish encrypting but leave the underlying stream open?

问题描述

我有一个CipherOutputStream支持另一个OutputStream。在我写完所有需要加密的数据到CipherOutputStream之后，我需要附加一些未加密的数据。

CipherOutputStream的文档表示调用 flush ）不会强制加密器中的最后一个块;因为我需要调用 close（）。但是， close（）也关闭了底层的OutputStream，我仍然需要写更多。

强制最后一个区块加密，不关闭流？我需要编写自己的NonClosingCipherOutputStream吗？

解决方案

如果您没有参考密码，您可以将 FilterOutputStream 传递给创建 CipherOutputStream 的方法。在 FilterOutputStream 中，覆盖关闭方法，使其不会实际关闭流。

I have a CipherOutputStream backed by another OutputStream. After I have finished writing all the data I need encrypted to the CipherOutputStream, I need to append some unencrypted data.

The documentation for CipherOutputStream says that calling flush() will not force the final block out of the encryptor; for that I need to call close(). But close() also closes the underlying OutputStream, which I still need to write more to.

How can I force the last block out of the encryptor without closing the stream? Do I need to write my own NonClosingCipherOutputStream?

解决方案

If you don't have a reference to the Cipher, you could pass a FilterOutputStream to the method that creates the CipherOutputStream. In the FilterOutputStream, override the close method so that it doesn't actually close the stream.

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