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

时间:2023-03-08 23:57:17
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://*.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:

  1. public class Test {
  2. public static void main(String[] args) throws Exception {
  3. KeyGenerator keyGen = KeyGenerator.getInstance("AES");
  4. keyGen.init(256);
  5. SecretKey key = keyGen.generateKey();
  6. ObjectOutputStream oop = new ObjectOutputStream(new
  7. FileOutputStream("c:\\key.dat"));
  8. oop.writeObject(key);
  9. oop.close();
  10. String strTest = "Hello, Jason";
  11. byte[] strAfterAES = encryptData(strTest.getBytes());
  12. System.out.println(new String(strAfterAES));
  13. byte[] strOriContent = decryptData(strAfterAES);
  14. System.out.println(new String(strOriContent));
  15. }
  16. public static byte[] encryptData(byte[] input) throws Exception {
  17. ObjectInputStream in = new ObjectInputStream(new FileInputStream("c:\\key.dat"));
  18. SecretKey aeskey = (SecretKey) in.readObject();
  19. Cipher c1 = Cipher.getInstance("AES");
  20. c1.init(Cipher.ENCRYPT_MODE, aeskey);
  21. byte[] cipherByte = c1.doFinal(input);
  22. return cipherByte;
  23. }
  24. public static byte[] decryptData(byte[] input) throws Exception {
  25. ObjectInputStream in = new ObjectInputStream(new FileInputStream("c:\\key.dat"));
  26. SecretKey aeskey = (SecretKey) in.readObject();
  27. Cipher c1 = Cipher.getInstance("AES");
  28. c1.init(Cipher.DECRYPT_MODE, aeskey);
  29. byte[] clearByte = c1.doFinal(input);
  30. return clearByte;
  31. }
  32. }

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