import java.security.InvalidKeyException;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.NoSuchAlgorithmException;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.spec.InvalidKeySpecException;

import java.util.Base64;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

public class KeyPairExample {

public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException,

IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException {

KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");

KeyPair keyPair = keyPairGen.generateKeyPair();

PrivateKey pvKey = keyPair.getPrivate();

PublicKey pbKey = keyPair.getPublic();

String encryptedData = encrypt("Your Name", pbKey);

String decryptedData = decrypt(encryptedData, pvKey);

System.out.println("Encrypted Data: " + encryptedData);

System.out.println("Decrypted Data: " + decryptedData);

}

public static String encrypt(String data, PublicKey pbKey) throws InvalidKeyException, NoSuchAlgorithmException,

NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException {

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, pbKey);

byte[] encryptedBytes = cipher.doFinal(data.getBytes());

return Base64.getEncoder().encodeToString(encryptedBytes);

}

public static String decrypt(String data, PrivateKey pvKey)

throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {

byte[] dataToDecrypt = Base64.getDecoder().decode(data);

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.DECRYPT_MODE, pvKey);

return new String(cipher.doFinal(dataToDecrypt));

}

}