cT42QGmd

1import java.io.UnsupportedEncodingException;
2import java.security.MessageDigest;
3import java.security.NoSuchAlgorithmException;
4import java.util.Arrays;
5import java.util.Base64;
6import javax.crypto.Cipher;
7import javax.crypto.spec.SecretKeySpec;
8
9public class AES {
10
11private static SecretKeySpec secretKey;
12private static byte[] key;
13
14public static void setKey(String myKey) {
15
16    MessageDigest sha = null; try {
17
18        key = myKey.getBytes("UTF-8");
19        sha = MessageDigest.getInstance("SHA-1");
20        key = sha.digest(key);
21        key = Arrays.copyOf(key, 16);
22        secretKey = new SecretKeySpec(key, "AES");
23    }
24    catch (NoSuchAlgorithmException e) {
25        e.printStackTrace();
26    }
27    catch (UnsupportedEncodingException e) {
28        e.printStackTrace();
29    }
30}
31
32public static String encrypt(String strToEncrypt, String secret) {
33
34    try {
35
36        setKey(secret);
37        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
38        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
39        return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
40    }
41    catch (Exception e) {
42
43        System.out.println("Error while encrypting: " + e.toString());
44    }
45    return null;
46}
47
48public static String decrypt(String strToDecrypt, String secret) {
49
50    try {
51        setKey(secret);
52        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
53        cipher.init(Cipher.DECRYPT_MODE, secretKey);
54        return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
55    }
56    catch (Exception e) {
57
58        System.out.println("Error while decrypting: " + e.toString());
59    }
60    return null;
61}
62
63public static void main(String[] args) {
64
65    final String secretKey = "Secret!";
66    String originalString = "Hello World!";
67    String encryptedString = AES.encrypt(originalString, secretKey);
68    String decryptedString = AES.decrypt(encryptedString, secretKey);
69    System.out.println(originalString);
70    System.out.println(encryptedString);
71    System.out.println(decryptedString);
72}
73}