如何在Python中进行加密并在Java中进行解密？ [英] How do I encrypt in Python and decrypt in Java?

问题描述

我正在尝试加密Python程序中的一些数据并将其保存下来，然后在Java程序中解密该数据。在Python中，我正在加密：

 从Crypto.Cipher import AES 
 KEY ='12345678901234567890123456789012' 
 
 def加密（数据）：
 cipher = AES.new（KEY，AES.MODE_CFB）
 return cipher.encrypt（data）
  

在Java中，我正在解密它：

  import java.security。*; 
 import javax.crypto。*; 
 import javax.crypto.spec.SecretKeySpec; 
 
 public class加密{
 private static byte [] KEY = {'1'，'2'，'3'，'4'，'5'，'6' '，'8'，'9'，'0'，'1'，'2'，'3'，'4'，'5'，'6'，'7'，
' '9'，'0'，'1'，'2'，'3'，'4'，'5'，'6'，'7'，'8' '，'2'}; 
 
 public static byte [] decrypt（byte [] data）throws NoSuchAlgorithmException，NoSuchPaddingException，
 InvalidKeyException，IllegalBlockSizeException，BadPaddingException {
 Cipher c = Cipher.getInstance（AES / CFB / NoPadding）; 
 Key key = new SecretKeySpec（KEY，AES）; 
 c.init（Cipher.DECRYPT_MODE，key）; 
 return c.doFinal（data）; 
} 
} 
  

但是我得到异常线程mainjava.security.InvalidKeyException：非法键大小或默认参数。显然，我做错了事情。但是什么？

解决方案

您有问题的原因是因为安全策略将您的密钥大小限制为128位，尝试使用256位密钥（需要Java加密扩展（JCE）无限优先权限策略文件）。

查看这个的讨论，你可能会注意到你有类似的问题。我的机器实际上有同样的问题。更新安全策略后，我能够运行代码。另外，我想你应该进行以下更改 c.init（Cipher.DECRYPT_MODE，key，new IvParameterSpec（new byte [16]））; 你缺少初始化向量对于CFB模式。如果解密的值不正确，请检查初始化密钥的方式。

I'm trying to encrypt some data in a Python program and save it out, then decrypt that data in a Java program. In Python, I'm encrypting it like this:

from Crypto.Cipher import AES
KEY = '12345678901234567890123456789012'

def encrypt(data):
    cipher = AES.new(KEY, AES.MODE_CFB)
    return cipher.encrypt(data)

And in Java, I'm decrypting it like this:

import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;

public class Encryption {
    private static byte[] KEY = { '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7',
        '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2' };

    public static byte[] decrypt(byte[] data) throws NoSuchAlgorithmException, NoSuchPaddingException,
            InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        Cipher c = Cipher.getInstance("AES/CFB/NoPadding");
        Key key = new SecretKeySpec(KEY, "AES");
        c.init(Cipher.DECRYPT_MODE, key);
        return c.doFinal(data);
    }
}

But I get Exception in thread "main" java.security.InvalidKeyException: Illegal key size or default parameters. Clearly, I'm doing something wrong. But what?

解决方案

The reason you have a problem is because the security policy limits your key size to 128-bit and you are attempting to use a 256-bit key (need Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files).

Look at this discussion and you'll probably notice you have a similar problem. I actually had the same problem on my machine. After updating the security policy, I was able to run your code. Also, I think you should make the following change c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(new byte[16])); You are missing the initialization vector for the CFB mode. If the decrypted value is not correct, check the way you initialize the keys.

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