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1import java.io.ByteArrayOutputStream;
2import java.io.UnsupportedEncodingException;
3import java.security.NoSuchAlgorithmException;
4import java.security.SecureRandom;
5import java.util.Base64;
6import javax.crypto.Cipher;
7import javax.crypto.NoSuchPaddingException;
8import javax.crypto.spec.IvParameterSpec;
9import javax.crypto.spec.SecretKeySpec;
10
11public class MCrypt {
12    private Cipher cipher;
13    private byte[] iv = new byte[16];
14    private IvParameterSpec ivspec;
15    private SecretKeySpec keyspec;
16
17    public MCrypt(String secretKey) {
18        SecureRandom random = new SecureRandom();
19        random.nextBytes(this.iv);
20        this.ivspec = new IvParameterSpec(this.iv);
21        try {
22            this.keyspec = buildKey(secretKey);
23        } catch (NoSuchAlgorithmException e) {
24            e.printStackTrace();
25        } catch (UnsupportedEncodingException e2) {
26            e2.printStackTrace();
27        }
28        try {
29            this.cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
30        } catch (NoSuchAlgorithmException e3) {
31            e3.printStackTrace();
32        } catch (NoSuchPaddingException e4) {
33            e4.printStackTrace();
34        }
35    }
36
37    private SecretKeySpec buildKey(String secretKey) throws NoSuchAlgorithmException, UnsupportedEncodingException {
38        return new SecretKeySpec(hexStringToByteArray(secretKey), "AES");
39    }
40
41    public byte[] hexStringToByteArray(String s) {
42        int len = s.length();
43        byte[] data = new byte[(len / 2)];
44        for (int i = 0; i < len; i += 2) {
45            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
46        }
47        return data;
48    }
49
50    public String encrypt(String text) throws Exception {
51        if (text == null || text.length() == 0) {
52            throw new Exception("Empty string");
53        }
54        try {
55            this.cipher.init(1, this.keyspec, this.ivspec);
56            byte[] e = this.cipher.doFinal(padString(text).getBytes());
57            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
58            outputStream.write(this.iv);
59            outputStream.write(e);
60            return new String(Base64.getEncoder().encode(outputStream.toByteArray()));
61        } catch (Exception e2) {
62            throw new Exception("[encrypt] " + e2.getMessage());
63        }
64    }
65
66    private static String padString(String source) {
67        int padLength = 16 - (source.length() % 16);
68        for (int i = 0; i < padLength; i++) {
69            source = source + '\u0000';
70        }
71        return source;
72    }
73}