Java中的AES-256和PKCS7Padding失败 [英] AES-256 and PKCS7Padding fails in Java

问题描述

我有几个图书馆，C＃，PHP和Android，他们都以相同的方式对字符串进行加密/解密，以便它们彼此兼容，即C＃将数据写入数据并将数据加密到数据库，PHP可以成功解密它并返回原始字符串。

我现在需要使用标准Java应用程序做同样的事情，所以我已经从我的Android库中获取了代码，需要库，但是我遇到了异常。据我所知，代码并不是android特定的，所以它不应该是一个问题。

以下是我的加密功能

  public static String encrypt plainPasword）
 {
 String password =; 
 try 
 {
 SecretKeySpec key = new SecretKeySpec（hcxilkqbbhczfeultgbskdmaunivmfuo.getBytes（US-ASCII），AES）; 
 IvParameterSpec iv = new IvParameterSpec（ryojvlzmdalyglrj.getBytes（US-ASCII））; 
 
密码密码= Cipher.getInstance（AES / CBC / PKCS7Padding）; 
 
 cipher.init（Cipher.ENCRYPT_MODE，key，iv）; 
 
 byte [] encoded = cipher.doFinal（plainPasword.getBytes（））; 
 password = new String（Base64.encodeBase64（encoded））; 
 
} 
 catch（Exception ex）
 {
 System.err.println（Encryption Exception：+ ex.toString（））; 
} 
返回密码; 
} 
  

当我调用 Encryption.encrypt（myString ）; 我得到以下异常：

 加密异常：java.security.NoSuchAlgorithmException：找不到任何提供支持AES / CBC / PKCS7Padding 
  

正如我所说这个代码在Android上工作正常，它应该没有任何差异在哪里运行。

感谢您提供的任何帮助。

更新

我发现我需要PKCS5Padding而不是7感谢链接评论。我现在收到以下例外：

 加密异常：java.security.InvalidKeyException：非法密钥大小
  

解决方案

首先，在Java中，标准填充名称是PKCS5Padding，而不是PKCS7Padding。 Java实际上正在执行PKCS＃7填充，但是在JCA规范中，PKCS5Padding是给定的名称。

接下来，您尝试使用AES-256，需要安装无限力量管辖权政策文件。

希望这只是一个例子，你不是每个消息使用相同的IV，对吗？

I have a couple of library, C#, PHP and Android where they all encrypt/decrypt a string in the same way so they are all compatible with each other, i.e. C# writes and encrypts data to a database and PHP can successfully decrypt it and return the original string.

I now need to do the same thing with a standard Java application, so I've taken the code from my Android library and need libraries but I am getting an exception. As far as I know the code wasn't android specific so it shouldn't be a problem.

Below is my encryption function

public static String encrypt(String plainPasword)
    {
            String password = "";
            try
            {
                SecretKeySpec key = new SecretKeySpec("hcxilkqbbhczfeultgbskdmaunivmfuo".getBytes("US-ASCII"), "AES");
                IvParameterSpec iv = new IvParameterSpec("ryojvlzmdalyglrj".getBytes("US-ASCII"));

                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

                cipher.init(Cipher.ENCRYPT_MODE, key, iv);

                byte[] encoded = cipher.doFinal(plainPasword.getBytes());
                password = new String(Base64.encodeBase64(encoded));

            }
            catch (Exception ex)
            {
                System.err.println("Encryption Exception: " + ex.toString());
            }
            return password;
    }

When I call Encryption.encrypt("myString"); I get the following exception:

Encryption Exception: java.security.NoSuchAlgorithmException: Cannot find any provider supporting AES/CBC/PKCS7Padding

As I said this code is working fine on Android and it shouldn't make any difference where it is running from.

Thanks for any help you can provide.

UPDATE

I found that I needed PKCS5Padding instead of 7 thanks to a link on a comment. I am now though getting the following exception:

Encryption Exception: java.security.InvalidKeyException: Illegal key size

解决方案

First, in Java, the standard padding name is PKCS5Padding, not PKCS7Padding. Java is actually performing PKCS #7 padding, but in the JCA specification, PKCS5Padding is the name given.

Next, you are trying to use AES-256, so you'll need to install the Unlimited Strength Jurisdiction policy files.

Hopefully this is just an example and you aren't using the same IV for every message, right?

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