Export DSAPrivateKeySpec : Digital Signature Algorithm « Security « Java Tutorial

1. Java Tutorial
2. Security
3. Digital Signature Algorithm

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.spec.DSAPrivateKeySpec;

public class MainClass {
  public static void main(String args[]) throws Exception {
    KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
    kpg.initialize(512, new SecureRandom());
    KeyPair kp = kpg.generateKeyPair();
    Class spec = Class.forName("java.security.spec.DSAPrivateKeySpec");
    KeyFactory kf = KeyFactory.getInstance("DSA");
    DSAPrivateKeySpec ks = (DSAPrivateKeySpec) kf.getKeySpec(kp.getPrivate(), spec);
    FileOutputStream fos = new FileOutputStream("exportedKey");
    ObjectOutputStream oos = new ObjectOutputStream(fos);
    oos.writeObject(ks.getX());
    oos.writeObject(ks.getP());
    oos.writeObject(ks.getQ());
    oos.writeObject(ks.getG());
  }
}