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// Java program to create a
// asymmetric key

package java_cryptography;
import java.security.KeyPair;
import java.security
	.KeyPairGenerator;
import java.security
	.SecureRandom;
import javax.xml.bind
	.DatatypeConverter;

// Class to create an asymmetric key
public class Asymmetric {

	private static final String RSA
		= "RSA";

	// Generating public and private keys
	// using RSA algorithm.
	public static KeyPair generateRSAKkeyPair()
		throws Exception
	{
		SecureRandom secureRandom
			= new SecureRandom();

		KeyPairGenerator keyPairGenerator
			= KeyPairGenerator.getInstance(RSA);

		keyPairGenerator.initialize(
			2048, secureRandom);

		return keyPairGenerator
			.generateKeyPair();
	}

	// Driver code
	public static void main(String args[])
		throws Exception
	{
		KeyPair keypair
			= generateRSAKkeyPair();

		System.out.println(
			"Public Key is: "
			+ DatatypeConverter.printHexBinary(
				keypair.getPublic().getEncoded()));

		System.out.println(
			"Private Key is: "
			+ DatatypeConverter.printHexBinary(
				keypair.getPrivate().getEncoded()));
	}
}