import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.spec.DSAPrivateKeySpec;
public class MainClass {
public static void main(String args[]) throws Exception {
FileInputStream fis = new FileInputStream("exportedKey");
ObjectInputStream ois = new ObjectInputStream(fis);
DSAPrivateKeySpec ks = new DSAPrivateKeySpec((BigInteger) ois.readObject(), (BigInteger) ois
.readObject(), (BigInteger) ois.readObject(), (BigInteger) ois.readObject());
KeyFactory kf = KeyFactory.getInstance("DSA");
PrivateKey pk = kf.generatePrivate(ks);
System.out.println("Got private key");
}
}