Verifying Digital Signature

package bouncyCastle;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.Signature;

public class VerifyingDigitalSignature {
	public static void main(String args[]) throws Exception {
		
		// Creating KeyPair generator object
		KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("DSA","BC");

		// Initializing the key pair generator
		keyPairGen.initialize(2048);

		// Generate the pair of keys
		KeyPair pair = keyPairGen.generateKeyPair();

		// Getting the privatekey from the key pair
		PrivateKey privKey = pair.getPrivate();

		// Creating a Signature object
		Signature sign = Signature.getInstance("SHA256withDSA");

		// Initializing the signature
		sign.initSign(privKey);
		byte[] bytes = "Hello how are you".getBytes();

		// Adding data to the signature
		sign.update(bytes);

		// Calculating the signature
		byte[] signature = sign.sign();

		// Initializing the signature
		sign.initVerify(pair.getPublic());
		sign.update(bytes);

		// Verifying the signature
		boolean bool = sign.verify(signature);

		if (bool) {
			System.out.println("Signature verified");
		} else {
			System.out.println("Signature failed");
		}
	}

}