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import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class Main {
public static void main(String[] argv) throws Exception {
String algorithm = "DSA"; // or RSA, DH, etc.
// Generate a 1024-bit Digital Signature Algorithm (DSA) key pair
KeyPairGenerator keyGen = KeyPairGenerator.getInstance(algorithm);
keyGen.initialize(1024);
KeyPair keypair = keyGen.genKeyPair();
PrivateKey privateKey = keypair.getPrivate();
PublicKey publicKey = keypair.getPublic();
byte[] privateKeyBytes = privateKey.getEncoded();
byte[] publicKeyBytes = publicKey.getEncoded();
KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
PrivateKey privateKey2 = keyFactory.generatePrivate(privateKeySpec);
EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyBytes);
PublicKey publicKey2 = keyFactory.generatePublic(publicKeySpec);
// The orginal and new keys are the same
boolean same = privateKey.equals(privateKey2);
same = publicKey.equals(publicKey2);
}
}
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