java中的AES 256算法遇到 Illegal key size or default parameters错的解决办法

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报错堆栈如下：

Caused by: java.security.InvalidKeyException:Illegal key size or default parameters
    at javax.crypto.Cipher.a(DashoA13*..)~[na:1.6]
    at javax.crypto.Cipher.a(DashoA13*..)~[na:1.6]
    at javax.crypto.Cipher.a(DashoA13*..)~[na:1.6]
    at javax.crypto.Cipher.init(DashoA13*..)~[na:1.6]
    at javax.crypto.Cipher.init(DashoA13*..)~[na:1.6]
    at my.package.Something.decode(RC4Decoder.java:25)~[my.package.jar:na]

Google到问题原因，链接地址如下：

http://stackoverflow.com/questions/6481627/java-security-illegal-key-size-or-default-parameters

根据回答找到下载新jar包链接地址如下：

http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html

把里面的两个jar包：local_policy.jar 和 US_export_policy.jar 替换掉原来安装目录C:Program FilesJavajre6libsecurity 下的两个jar包接可以了

然后就重新运行程序，不会报错了，测试代码如下：

public class Test {
    public static void main(String[] args) throws Exception {
         KeyGenerator keyGen = KeyGenerator.getInstance("AES");
         keyGen.init(256);
         SecretKey key = keyGen.generateKey();
         ObjectOutputStream oop = new ObjectOutputStream(new
         FileOutputStream("c:\key.dat"));
         oop.writeObject(key);
         oop.close();

        String strTest = "Hello, Jason";
        byte[] strAfterAES = encryptData(strTest.getBytes());
        System.out.println(new String(strAfterAES));
        byte[] strOriContent = decryptData(strAfterAES);
        System.out.println(new String(strOriContent));
    }


    public static byte[] encryptData(byte[] input) throws Exception {
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("c:\key.dat"));
        SecretKey aeskey = (SecretKey) in.readObject();
        Cipher c1 = Cipher.getInstance("AES");
        c1.init(Cipher.ENCRYPT_MODE, aeskey);
        byte[] cipherByte = c1.doFinal(input);
        return cipherByte;
    }


    public static byte[] decryptData(byte[] input) throws Exception {
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("c:\key.dat"));
        SecretKey aeskey = (SecretKey) in.readObject();
        Cipher c1 = Cipher.getInstance("AES");
        c1.init(Cipher.DECRYPT_MODE, aeskey);
        byte[] clearByte = c1.doFinal(input);
        return clearByte;
    }
}

BTW:

 If ur JVM is IBM JVM pls refer to the below link to update the unlimited key size jars

http://pic.dhe.ibm.com/infocenter/wasinfo/v7r0/index.jsp?topic=%2Fcom.ibm.websphere.nd.multiplatform.doc%2Finfo%2Fae%2Fae%2Ftwbs_tunev6wss.html