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1import javax.crypto.Cipher;
2import javax.crypto.spec.IvParameterSpec;
3import javax.crypto.spec.SecretKeySpec;
4import java.nio.charset.StandardCharsets;
5
6public class AES256 {
7
8	public static String encrypt(String strToEncrypt) {
9		try {
10			byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
11			IvParameterSpec ivspec = new IvParameterSpec(iv);
12			String key = "3FC4F0D2AB50057BCE0D90D9187A22B1";
13			SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
14
15			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
16			cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);
17//			return toHexString(Base64.getEncoder()
18//				.encodeToString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8))).getBytes());
19			return toHexString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)));
20		} catch (Exception e) {
21			System.out.println("Error while encrypting: " + e.toString());
22		}
23		return null;
24	}
25
26	public static String decrypt(String strToDecrypt) {
27		try {
28			byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
29			IvParameterSpec ivspec = new IvParameterSpec(iv);
30			String key = "3FC4F0D2AB50057BCE0D90D9187A22B1";
31			SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
32
33			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
34			cipher.init(Cipher.DECRYPT_MODE, secretKey, ivspec);
35			return new String(cipher.doFinal(fromHexString(strToDecrypt)), StandardCharsets.UTF_8);
36		} catch (Exception e) {
37			System.out.println("Error while decrypting: " + e.toString());
38		}
39		return null;
40	}
41
42	public static String toHexString(byte[] ba) {
43		StringBuilder str = new StringBuilder();
44		for (int i = 0; i < ba.length; i++) {
45			str.append(String.format("%02x", ba[i]));
46		}
47		return str.toString().toUpperCase();
48	}
49
50	public static byte[] fromHexString(String hex) {
51		StringBuilder str = new StringBuilder();
52		for (int i = 0; i < hex.length(); i += 2) {
53			str.append((char) Integer.parseInt(hex.substring(i, i + 2), 16));
54		}
55		byte[] res = new byte[str.length()];
56		for (int i = 0; i < str.length(); i++) {
57			res[i] = (byte) str.charAt(i);
58		}
59		return res;
60	}
61}
62