xfSmWpy0

1public class EncryptionUtils {
2  
3  private MessageDigest dg = null;
4  private String username, password;
5  private byte[] key = null;
6  
7  public EncryptionUtils(String username, String password) {
8    this.username = username;
9    this.password = password;
10  }
11  
12  public String encode(String message) {
13    return byteArrayToString(getEncode(getKey(), message));
14  }
15  
16  public String dencode(String message) {
17    try {
18      return new String(aes256Dec(getKey(), getEncode(getKey(), message)));
19    } catch (Exception e) {
20      e.printStackTrace();
21    }
22    return "";
23  }
24  
25  private byte[] getKey() {
26    
27    if (key != null) {
28      return key;
29    }
30    
31    try {
32      return hash(arrayMerge(username.getBytes(), hash(password.getBytes())));
33    } catch (Exception e) {
34      e.printStackTrace();
35    }
36    return new byte[]{0};
37  }
38  
39  private byte[] getEncode(byte[] key, String message) {
40    try {
41      return aes256Enc(key, message.getBytes());
42    } catch (Exception e) {
43      e.printStackTrace();
44    }
45    return new byte[]{0};
46  }
47  
48  private String byteArrayToString(byte[] bArr) {
49    return DatatypeConverter.printHexBinary(bArr);
50  }
51  
52  public byte[] stringToByteArray(String str) {
53    return DatatypeConverter.parseHexBinary(str);
54  }
55  
56  private byte[] arrayMerge(byte[] arr1, byte[] arr2) {
57    byte[] res = new byte[arr1.length + arr2.length];
58    System.arraycopy(arr1, 0, res, 0, arr1.length);
59    System.arraycopy(arr2, 0, res, arr1.length, arr2.length);
60    return res;
61  }
62  
63  private byte[] hash(byte[] in) throws Exception {
64    if (dg == null)
65      dg = MessageDigest.getInstance("SHA-256");
66    return dg.digest(in);
67  }
68  
69  private byte[] aes256Enc(byte[] key, byte[] in) throws Exception {
70    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
71    SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
72    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
73    return cipher.doFinal(in);
74  }
75  
76  private byte[] aes256Dec(byte[] key, byte[] in) throws Exception {
77    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
78    SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
79    cipher.init(Cipher.DECRYPT_MODE, secretKey);
80    return cipher.doFinal(in);
81  }
82}