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import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
public class Main {
public static void main(String[] argv) throws Exception {
KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5");
SecretKey key = keyGen.generateKey();
Mac mac = Mac.getInstance(key.getAlgorithm());
mac.init(key);
String str = "This message will be digested";
byte[] utf8 = str.getBytes("UTF8");
byte[] digest = mac.doFinal(utf8);
String digestB64 = new sun.misc.BASE64Encoder().encode(digest);
System.out.println(digestB64);
}
}
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