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1import javax.crypto.BadPaddingException;
2import javax.crypto.Cipher;
3import javax.crypto.IllegalBlockSizeException;
4import javax.crypto.NoSuchPaddingException;
5import javax.crypto.spec.SecretKeySpec;
6import java.security.InvalidKeyException;
7import java.security.NoSuchAlgorithmException;
8
9
10/**
11 * Symmetric encrypt & decrypt with AES algorithm
12 */
13public class TryCipher {
14
15    private static SecretKeySpec secretKey;
16    private static Cipher cipher;
17
18    public static void main(String[] args) {
19
20        String key = "ABCDEFGHABCDEFGH";
21        String input = "This is an input String";
22        byte[] output;
23        byte[] output2;
24
25        try {
26            secretKey = new SecretKeySpec(key.getBytes(), "AES");
27            cipher = Cipher.getInstance("AES");
28
29            //encrypt
30            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
31            output = cipher.doFinal(input.getBytes());
32            System.out.println("Encrypted string:");
33            System.out.println(new String(output));
34
35            //decrypt
36            cipher.init(Cipher.DECRYPT_MODE, secretKey);
37            output2 = cipher.doFinal(output);
38            System.out.println("Decrypted string:");
39            System.out.println(new String(output2));
40
41        } catch (InvalidKeyException | BadPaddingException | IllegalBlockSizeException | NoSuchAlgorithmException |
42                NoSuchPaddingException e) {
43            e.printStackTrace();
44        }
45    }
46}