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1import javax.crypto.Cipher;
2import javax.crypto.spec.SecretKeySpec;
3import java.nio.charset.StandardCharsets;
4import java.util.Base64;
5
6public class AESEncryptor {
7
8    private static final byte[] key = "1234567890123456".getBytes(StandardCharsets.UTF_8);
9    private static final String ALGORITHM = "AES";
10
11    public static AESEncryptor instance = new AESEncryptor();
12
13    public String encrypt(String plainText) throws Exception {
14        return Base64.getEncoder().encodeToString(this.encrypt(plainText.getBytes(StandardCharsets.UTF_8)));
15    }
16
17    public String decrypt(String encText) throws Exception {
18        return new String(decrypt(Base64.getDecoder().decode(encText)), StandardCharsets.UTF_8);
19    }
20
21    private byte[] encrypt(byte[] plainText) throws Exception {
22        SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
23        Cipher cipher = Cipher.getInstance(ALGORITHM);
24        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
25
26        return cipher.doFinal(plainText);
27    }
28
29    private byte[] decrypt(byte[] cipherText) throws Exception {
30        SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
31        Cipher cipher = Cipher.getInstance(ALGORITHM);
32        cipher.init(Cipher.DECRYPT_MODE, secretKey);
33
34        return cipher.doFinal(cipherText);
35    }
36
37}