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1import java.io.UnsupportedEncodingException;
2import java.security.MessageDigest;
3import java.security.NoSuchAlgorithmException;
4import java.util.Arrays;
5import java.util.Base64;
6 
7import javax.crypto.Cipher;
8import javax.crypto.spec.SecretKeySpec;
9 
10public class AES {
11 
12    private static SecretKeySpec secretKey;
13    private static byte[] key;
14    
15    public static void main(String args[]) {
16        System.out.println(encrypt("996772409638", "cr@gh19)k"));
17        System.out.println(decrypt("u0l7KK7qapBjtTrtIIAXFg==", "cr@gh19)k"));
18    }
19 
20    public static void setKey(String myKey) 
21    {
22        MessageDigest sha = null;
23        try {
24            key = myKey.getBytes("UTF-8");
25            sha = MessageDigest.getInstance("SHA-1");
26            key = sha.digest(key);
27            key = Arrays.copyOf(key, 16); 
28            secretKey = new SecretKeySpec(key, "AES");
29        } 
30        catch (NoSuchAlgorithmException e) {
31            e.printStackTrace();
32        } 
33        catch (UnsupportedEncodingException e) {
34            e.printStackTrace();
35        }
36    }
37 
38    public static String encrypt(String strToEncrypt, String secret) 
39    {
40        try
41        {
42            setKey(secret);
43            Cipher cipher = Cipher.getInstance("AES");
44            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
45            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
46        } 
47        catch (Exception e) 
48        {
49            System.out.println("Error while encrypting: " + e.toString());
50        }
51        return null;
52    }
53 
54    public static String decrypt(String strToDecrypt, String secret) 
55    {
56        try
57        {
58            setKey(secret);
59            Cipher cipher = Cipher.getInstance("AES");
60            cipher.init(Cipher.DECRYPT_MODE, secretKey);
61            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
62        } 
63        catch (Exception e) 
64        {
65            System.out.println("Error while decrypting: " + e.toString());
66        }
67        return null;
68    }
69}