CryptoJS AES增加文件大小 [英] CryptoJS AES Increase File Size

问题描述

谢谢您的帮助。

我对sjcl库或cryptojs aes库有问题。
每次我用aes加密文件时，文件大小为*2。
例如：当我上载4mb文件时，服务器上有8mb文件。

I have a problem with sjcl library or cryptojs aes library. Everytime i encrypt my file with aes the file size is * 2. For example: When i upload a 4mb file then there is a 8mb file on my server.

我在块上分割了文件，字节大小可以除以16。

I split the file on block which bytesize can be divided by 16.

请帮助我

这是我加密文件的方式：

This is the way i encrypt the file:

var l_EncryptetData = CryptoJS.AES.encrypt(p_ChunkData, p_FileKey).toString();

这是一个示例数组，具有4mb文件中的块大小：

And this is a example array with block sizes from the 4mb file:

0: 1572864
1: 1572864
2: 867005
length: 3

而FileKey是SHA-256哈希

And the FileKey is a SHA-256 Hash

推荐答案

您正在将密文输出（ CipherParams 对象）转换为字符串。默认情况下，CryptoJS通过以十六进制表示结果来实现此目的，其中每个字节被编码为两个十六进制数字。您可以通过提供自定义格式策略来覆盖此行为。或者更好的是，不要将密文转换为字符串；

You are converting the cipher output (a CipherParams object) to a character string. By default, CryptoJS does this by representing the result in hexadecimal, where each byte is encoded as two hex digits. You can override this behavior by providing a custom format strategy. Or better yet, don't convert the cipher text to a character string; keep it as binary data.

请警告您的应用程序用户它不安全。

Please warn users of your application that it is not secure.

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