AES-256 和 PKCS7Padding 在 Java 中失败
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AES-256 and PKCS7Padding fails in Java
提问by Boardy
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.
我有几个库，C#、PHP 和 Android，它们都以相同的方式加密/解密字符串，因此它们彼此兼容，即 C# 将数据写入和加密到数据库，PHP 可以成功解密并返回原始字符串。
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.
我现在需要用标准 Java 应用程序做同样的事情，所以我从我的 Android 库中获取了代码并需要库，但我得到了一个例外。据我所知，该代码不是特定于 Android 的，因此应该不成问题。
Below is my encryption function
下面是我的加密功能
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:
当我打电话时，Encryption.encrypt("myString")我收到以下异常：
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.
正如我所说，这段代码在 Android 上运行良好，它从哪里运行应该没有任何区别。
Update
更新
I found that I needed PKCS5Padding instead of 7 thanks to a link on a comment. I am now though getting the following exception:
由于评论中的链接，我发现我需要 PKCS5Padding 而不是 7。我现在虽然收到以下异常：
Encryption Exception: java.security.InvalidKeyException: Illegal key size
回答by erickson
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.
首先，在 Java 中，标准的填充名称是 PKCS5Padding，而不是 PKCS7Padding。Java 实际上执行 PKCS #7 填充，但在 JCA 规范中，PKCS5Padding 是给定的名称。
Next, you are trying to use AES-256, so you'll need to install the Unlimited Strength Jurisdictionpolicy files.
接下来，您尝试使用 AES-256，因此您需要安装Unlimited Strength Jurisdiction策略文件。
Hopefully this is just an example and you aren't using the same IV for every message, right?
希望这只是一个示例，您不会对每条消息都使用相同的 IV，对吗？
