source: branches/2520_PersistenceReintegration/HeuristicLab.Clients.Common/3.3/CryptoService.cs @ 16453

Last change on this file since 16453 was 16453, checked in by jkarder, 12 months ago

#2520: updated year of copyrights

File size: 2.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Security.Cryptography;
24using System.Text;
25
26namespace HeuristicLab.Clients.Common {
27  /// <summary>
28  /// Provides functionality for encrypting and decrypting strings.
29  /// Based on the code from http://weblogs.asp.net/jgalloway/archive/2008/04/13/encrypting-passwords-in-a-net-app-config-file.aspx
30  /// </summary>
31  public static class CryptoService {
32    private static byte[] entropy = System.Text.Encoding.Unicode.GetBytes("Salt Is Not A Password");
33
34    public static string EncryptString(string input) {
35      byte[] encryptedData = ProtectedData.Protect(
36        Encoding.Unicode.GetBytes(input),
37        entropy,
38        DataProtectionScope.CurrentUser);
39      return Convert.ToBase64String(encryptedData);
40    }
41
42    public static string DecryptString(string encryptedData) {
43      try {
44        byte[] decryptedData = System.Security.Cryptography.ProtectedData.Unprotect(
45          Convert.FromBase64String(encryptedData),
46          entropy,
47          System.Security.Cryptography.DataProtectionScope.CurrentUser);
48        return System.Text.Encoding.Unicode.GetString(decryptedData);
49      }
50      catch (CryptographicException) {
51        // we assume here that the password was saved in clear text in a previous HL version
52        return encryptedData;
53      }
54      catch (FormatException) {
55        return encryptedData;
56      }
57    }
58  }
59}
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