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1package com.lukichova.olenyn.app.classes;
2
3import javax.crypto.Cipher;
4import javax.crypto.spec.SecretKeySpec;
5import java.security.MessageDigest;
6import java.util.Arrays;
7import java.util.Base64;
8
9public class AES {
10    public static final String algorithm = "AES";
11    private static SecretKeySpec secretKey;
12    private static byte[] key;
13    private static String secret = "123";
14
15    public static void initKet() throws Exception {
16        if (key == null) {
17            MessageDigest sha = null;
18            key = secret.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, algorithm);
23        }
24    }
25
26    public static String encrypt(String strToEncrypt) throws Exception {
27            initKet();
28            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
29            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
30            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
31    }
32
33    public static String decrypt(String strToDecrypt) throws Exception {
34            initKet();
35            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
36            cipher.init(Cipher.DECRYPT_MODE, secretKey);
37            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
38    }
39}