import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
public class Main {
public static void main(String[] argv) throws Exception {
KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5");
SecretKey key = keyGen.generateKey();
// Generate a key for the HMAC-SHA1 keyed-hashing algorithm
keyGen = KeyGenerator.getInstance("HmacSHA1");
key = keyGen.generateKey();
}
}