Generating a Message Authentication Code (MAC) Key : Mac « Security « Java Tutorial

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2. Security
3. Mac

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();
  }
}