This small program prints same output everytime I run it using jdk 1.3
and jce1_2-do.jar.

But when I run it using jdk 1.4, it prints different values everytime
I run it. Has the behavior of Mac class changed in 1.4? How can I make
it print the same value in 1.4 also?

import java.security.Provider;
import java.security.Security;
import java.security.spec.*;
import javax.commerce.util.*;

public class t1 {

public static void main(String[] args) {
       try {
               String ctext = "message";
               Provider sunJce = new
com.sun.crypto.provider.SunJCE();

               Security.addProvider(sunJce);

               javax.crypto.KeyGenerator kg =
javax.crypto.KeyGenerator.getInstance("HmacMD5", sunJce.getName());

               javax.crypto.SecretKey sk = kg.generateKey();

               Mac mac = Mac.getInstance("HmacMD5",
sunJce.getName());

               byte[] b1 = sk.getEncoded();
               mac.init(sk);

               byte[] bmac = mac.doFinal(ctext.getBytes());

               BASE64Encoder benc = new BASE64Encoder();
               System.out.println("string " + benc.encode(bmac));
       } catch (Exception e) {
               System.err.println("excp: " + e.getMessage());
               e.printStackTrace();
       }
}

}