Android加密和解密错误-javax.crypto.IllegalBlockSizeException:解密中的最后一个块不完整 [英] Android Encryption and Decryption Error - javax.crypto.IllegalBlockSizeException: last block incomplete in decryption

问题描述

以下代码中的解密问题.我有一个加密的字符串被发送到setData().我正在尝试解密加密的字符串(数据).我不断收到的错误是

I have an issue with the decryption in the following code. I have a encrypted string being sent to setData(). I am trying to decrypt the encrypted string(data). The error I keep getting is

javax.crypto.IllegalBlockSizeException:解密中的最后一个块不完整

javax.crypto.IllegalBlockSizeException: last block incomplete in decryption

byte[] data;
String key = "tkg96827pco74510";

byte[] encryptedOut;
String decryptedOut;

Key aesKey;
Cipher cipher;

public void setData(String dataIn){
    this.data = dataIn.getBytes();
    try {
        aesKey = new SecretKeySpec(key.getBytes(), "AES");
        cipher = Cipher.getInstance("AES");

    }catch(Exception e){
        System.out.println("SET DATA ERROR - " + e);
    }
}
public void encrypt() {
    try{
        cipher.init(Cipher.ENCRYPT_MODE, aesKey);
        encryptedOut = cipher.doFinal(data);
    }catch(Exception e){
        System.out.println(e);
    }
}

public void decrypt(){
    try {
        cipher.init(Cipher.DECRYPT_MODE, aesKey);
        decryptedOut = new String(cipher.doFinal(data));

    }catch(Exception e){
        System.out.println("Decrypt Error: " + e);
    }
}

public byte[] getEncrypted() {
   return encryptedOut;
}

public String getDecrypted(){
    return decryptedOut;
}

推荐答案

问题是由以下行引起的:

The problem is caused by this line :

decryptedOut = new String(cipher.doFinal(data));

在这里，您正在传递原始数据以进行解密.但是您应该在此处传递 encryptedOut .

Here you are passing original data to decrypt. But you should pass encryptedOut here.

因此解决方案是:

decryptedOut = new String(cipher.doFinal(encryptedOut));

是的，请通过某种编码机制将String转换为byteArray，反之亦然，例如"UTF-8" .

and yes, Please pass some encoding mechanism to convert String to byteArray and vice-versa like "UTF-8".

所以正确的行应该是:

decryptedOut = new String(cipher.doFinal(encryptedOut),"UTF-8");

鉴于您已经完成了到这样的字节的转换:

Given you have done conversion to bytes like this :

this.data = dataIn.getBytes("UTF-8");

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