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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 Files\Java\jre6\lib\security 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
