Cryptograhpy cipher RC4 2048bit in JDK1.5

Question

I need to use RC4 key size of (256 bytes) 2048 bits. From JCE JavaDoc
http://java.sun.com/j2se/1.5.0/docs/guide/security/jce/JCERefGuide.html#AppE
RC4 can only support 128 bytes/1024 bits
I wonder, does any of the JDK/JCE version support RC4 for 2048 bits key?
Or can you suggest a shareware provider which supports RC4 2048 bits?
I had this topic posted orginaly in
http://forum.java.sun.com/thread.jspa?threadID=757353
Thanks a lot.

Answer 1

Thanks for your reply:
I have downloaded Unlimited Strength Jurisdiction Policy Files and replaced jars in my jre/lib/security. I still have the same problem.
Here is my code: The parameter keyBytes is the same as we use on the other side of the wire implemented in C version of openssl.
private Cipher quickTestRC4(byte[] keyBytes){
SecretKey key = new SecretKeySpec(keyBytes, "RC4");
Cipher cipher = null;
try {
cipher = Cipher.getInstance("RC4");
System.out.println("Testing RC4: initialize by passing keyBytes size = "+keyBytes.length+" bytes");
cipher.init(Cipher.ENCRYPT_MODE, key);
catch (Exception e1){
e1.printStackTrace();
return cipher;
Here is the exception:
Testing RC4: initialize by passing keyBytes size = 256 bytes
java.security.InvalidKeyException: Key length must be between 40 and 1024 bit
at com.sun.crypto.provider.ARCFOURCipher.a(DashoA12275)
at com.sun.crypto.provider.ARCFOURCipher.a(DashoA12275)
at com.sun.crypto.provider.ARCFOURCipher.engineInit(DashoA12275)
at javax.crypto.Cipher.a(DashoA12275)
at javax.crypto.Cipher.a(DashoA12275)
at javax.crypto.Cipher.init(DashoA12275)
at javax.crypto.Cipher.init(DashoA12275)
at com.MyTest.quickTestRC4(MyTest.java:138)
If I pass in 128 bytes keyBytes, it works fine.
I wonder, what could be the problem here and how to solve it?
Thanks a lot.