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source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.EPPlus/4.0.3/EPPlus-4.0.3/VBA/ExcelVbaProtection.cs @ 13365

Last change on this file since 13365 was 12074, checked in by sraggl, 10 years ago

#2341: Added EPPlus-4.0.3 to ExtLibs

File size: 4.5 KB
RevLine 
[12074]1/*******************************************************************************
2 * You may amend and distribute as you like, but don't remove this header!
3 *
4 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
5 * See http://www.codeplex.com/EPPlus for details.
6 *
7 * Copyright (C) 2011  Jan Källman
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
17 * See the GNU Lesser General Public License for more details.
18 *
19 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
20 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
21 *
22 * All code and executables are provided "as is" with no warranty either express or implied.
23 * The author accepts no liability for any damage or loss of business that this product may cause.
24 *
25 * Code change notes:
26 *
27 * Author             Change            Date
28 *******************************************************************************
29 * Jan Källman    Added   12-APR-2012
30 *******************************************************************************/
31using System;
32using System.Collections.Generic;
33using System.Linq;
34using System.Text;
35using System.Security.Cryptography;
36
37namespace OfficeOpenXml.VBA
38{
39    /// <summary>
40    /// Vba security properties
41    /// </summary>
42    public class ExcelVbaProtection
43    {
44        ExcelVbaProject _project;
45        internal ExcelVbaProtection(ExcelVbaProject project)
46        {
47            _project = project;
48            VisibilityState = true;
49        }
50        /// <summary>
51        /// Specifies whether access to the VBA project was restricted by the user
52        /// </summary>
53        public bool UserProtected { get; internal set; }
54        /// <summary>
55        /// Specifies whether access to the VBA project was restricted by the VBA host application
56        /// </summary>
57        public bool HostProtected { get; internal set; }
58        /// <summary>
59        /// Specifies whether access to the VBA project was restricted by the VBA project editor
60        /// </summary>
61        public bool VbeProtected { get; internal set; }
62        /// <summary>
63        /// Specifies whether the VBA project is visible.
64        /// </summary>
65        public bool VisibilityState { get; internal set; }
66        internal byte[] PasswordHash { get; set; }
67        internal byte[] PasswordKey { get; set; }
68        /// <summary>
69        /// Password protect the VBA project.
70        /// An empty string or null will remove the password protection
71        /// </summary>
72        /// <param name="Password">The password</param>
73        public void SetPassword(string Password)
74        {
75
76            if (string.IsNullOrEmpty(Password))
77            {
78                PasswordHash = null;
79                PasswordKey = null;
80                VbeProtected = false;
81                HostProtected = false;
82                UserProtected = false;
83                VisibilityState = true;
84                _project.ProjectID = "{5DD90D76-4904-47A2-AF0D-D69B4673604E}";
85            }
86            else
87            {
88                //Join Password and Key
89                byte[] data;
90                //Set the key
91                PasswordKey = new byte[4];
92                RandomNumberGenerator r = RandomNumberGenerator.Create();
93                r.GetBytes(PasswordKey);
94
95                data = new byte[Password.Length + 4];
96                Array.Copy(Encoding.GetEncoding(_project.CodePage).GetBytes(Password), data, Password.Length);
97                VbeProtected = true;
98                VisibilityState = false;
99                Array.Copy(PasswordKey, 0, data, data.Length - 4, 4);
100
101                //Calculate Hash
102                var provider = SHA1.Create();
103                PasswordHash = provider.ComputeHash(data);
104                _project.ProjectID = "{00000000-0000-0000-0000-000000000000}";
105            }
106        }
107        //public void ValidatePassword(string Password)                     
108        //{
109
110        //}       
111    }
112}
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