List of usage examples for java.security.spec DSAPublicKeySpec getG
public BigInteger getG()
From source file:MainClass.java
public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException { KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA"); kpg.initialize(512);/*from w w w . java 2 s. co m*/ 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()); }
From source file:MainClass.java
public static void main(String args[]) throws Exception { KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA"); SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN"); random.setSeed(101L);/*from ww w . j a v a 2 s . c o m*/ keyGen.initialize(1024, random); KeyPair keypair = keyGen.generateKeyPair(); KeyFactory kfactory = KeyFactory.getInstance("DSA"); DSAPublicKeySpec kspec = (DSAPublicKeySpec) kfactory.getKeySpec(keypair.getPublic(), DSAPublicKeySpec.class); System.out.println(keypair.getPublic()); FileOutputStream fos = new FileOutputStream("publicKeys"); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(kspec.getY()); oos.writeObject(kspec.getP()); oos.writeObject(kspec.getQ()); oos.writeObject(kspec.getG()); FileInputStream fin = new FileInputStream("publicKeys"); ObjectInputStream ois = new ObjectInputStream(fin); BigInteger Y = (BigInteger) ois.readObject(); BigInteger P = (BigInteger) ois.readObject(); BigInteger Q = (BigInteger) ois.readObject(); BigInteger G = (BigInteger) ois.readObject(); DSAPublicKeySpec keyspec = new DSAPublicKeySpec(Y, P, Q, G); PublicKey pkey = kfactory.generatePublic(keyspec); System.out.println(pkey); }