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1public class Cryptogram {
2
3    private static byte[] iv;
4    private static IvParameterSpec ivspec;
5
6    public static byte[] Encrypt(String txt, SecretKey key) {
7        try {
8            Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
9            cipher.init(Cipher.ENCRYPT_MODE, key);
10            byte[] cipherText = cipher.doFinal(txt.getBytes("UTF-8"));
11            iv = cipher.getIV();
12            ivspec = new IvParameterSpec(iv);
13            return cipherText;
14        } catch (Exception e) {
15            return e.toString().getBytes(Charset.forName("UTF-8"));
16        }
17    }
18
19    public static String Decrypt(byte[] txt, SecretKey key) {
20        try {
21            Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding", Security.getProvider("BC"));
22            cipher.init(Cipher.DECRYPT_MODE, key, ivspec);
23            String decryptString = new String(cipher.doFinal(txt), "UTF-8");
24            return decryptString;
25        } catch (Exception e) {
26            return e.toString();
27        }
28    }
29}