bjDiwR4S

1import javax.security.auth.login.LoginException;
2import java.security.*;
3import javax.crypto.*;
4import java.io.*;
5
6public class Main {
7    public static void main(String[] args) throws LoginException, NoSuchAlgorithmException, NoSuchPaddingException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException {
8        String s = "Hello world";
9
10        Cipher cipher = Cipher.getInstance("AES");
11
12        KeyGenerator kgen = KeyGenerator.getInstance("AES");
13        kgen.init(128);
14        SecretKey key = kgen.generateKey();
15
16        cipher.init(Cipher.ENCRYPT_MODE, key);
17
18        byte[] bytes = cipher.doFinal(s.getBytes());
19        System.out.print("\n");
20        for(byte b : bytes) {
21            System.out.print(b);
22        }
23        Cipher decryptCipher = Cipher.getInstance("AES");
24        decryptCipher.init(Cipher.DECRYPT_MODE, key);
25        byte[] decriptedBytes = decryptCipher.doFinal(bytes);
26        System.out.print("\n");
27        for(byte b : decriptedBytes) {
28            System.out.print(b);
29        }
30    }
31}