DSA Key Translator : Digital Signature Algorithm « Security « Java Tutorial

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

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.DSAPublicKeySpec;
import java.security.spec.InvalidKeySpecException;

public class MainClass {
  public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException {
    KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
    kpg.initialize(512);
    KeyPair keys = kpg.genKeyPair();
    PrivateKey priKey = keys.getPrivate();
    PublicKey pubKey = keys.getPublic();
    KeyFactory kf = KeyFactory.getInstance("DSA");
    DSAPrivateKeySpec dsaPriKeySpec = (DSAPrivateKeySpec) kf.getKeySpec(priKey,
        DSAPrivateKeySpec.class);
    DSAPublicKeySpec dsaPubKeySpec = (DSAPublicKeySpec) kf.getKeySpec(pubKey,
        DSAPublicKeySpec.class);
    System.out.println("\nDSA Private Key");
    System.out.println("\nx = " + dsaPriKeySpec.getX());
    System.out.println("\nDSA Public Key");
    System.out.println("\ng = " + dsaPubKeySpec.getG());
    System.out.println("\np = " + dsaPubKeySpec.getP());
    System.out.println("\nq = " + dsaPubKeySpec.getQ());
    System.out.println("\ny = " + dsaPubKeySpec.getY());
  }
}
/*

DSA Private Key

x = 776400661570001590971791637592968309673321751461

DSA Public Key

g = 5421644057436475141609648488325705128047428394380474376834667300766108262613900542681289080713724597310673074119355136085795982097390670890367185141189796

p = 13232376895198612407547930718267435757728527029623408872245156039757713029036368719146452186041204237350521785240337048752071462798273003935646236777459223

q = 857393771208094202104259627990318636601332086981

y = 9079896982621092847112483863863391775338648287464668946120962630349123906761002084264031103470728516533966483834610830067548970604189069706612392762346323

*/