/*******************************************************************************
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* You may amend and distribute as you like, but don't remove this header!
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*
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* EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
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* See http://www.codeplex.com/EPPlus for details.
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*
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* Copyright (C) 2011 Jan Källman
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
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* If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
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*
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* All code and executables are provided "as is" with no warranty either express or implied.
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* The author accepts no liability for any damage or loss of business that this product may cause.
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*
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* Code change notes:
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*
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* Author Change Date
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*******************************************************************************
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* Jan Källman Added 12-APR-2012
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*******************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Security.Cryptography;
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namespace HH.WMS.Utils.EPPlus.VBA
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{
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/// <summary>
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/// Vba security properties
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/// </summary>
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public class ExcelVbaProtection
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{
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ExcelVbaProject _project;
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internal ExcelVbaProtection(ExcelVbaProject project)
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{
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_project = project;
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VisibilityState = true;
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}
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/// <summary>
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/// Specifies whether access to the VBA project was restricted by the user
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/// </summary>
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public bool UserProtected { get; internal set; }
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/// <summary>
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/// Specifies whether access to the VBA project was restricted by the VBA host application
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/// </summary>
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public bool HostProtected { get; internal set; }
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/// <summary>
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/// Specifies whether access to the VBA project was restricted by the VBA project editor
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/// </summary>
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public bool VbeProtected { get; internal set; }
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/// <summary>
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/// Specifies whether the VBA project is visible.
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/// </summary>
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public bool VisibilityState { get; internal set; }
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internal byte[] PasswordHash { get; set; }
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internal byte[] PasswordKey { get; set; }
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/// <summary>
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/// Password protect the VBA project.
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/// An empty string or null will remove the password protection
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/// </summary>
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/// <param name="Password">The password</param>
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public void SetPassword(string Password)
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{
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if (string.IsNullOrEmpty(Password))
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{
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PasswordHash = null;
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PasswordKey = null;
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VbeProtected = false;
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HostProtected = false;
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UserProtected = false;
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VisibilityState = true;
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_project.ProjectID = "{5DD90D76-4904-47A2-AF0D-D69B4673604E}";
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}
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else
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{
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//Join Password and Key
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byte[] data;
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//Set the key
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PasswordKey = new byte[4];
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RandomNumberGenerator r = RandomNumberGenerator.Create();
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r.GetBytes(PasswordKey);
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data = new byte[Password.Length + 4];
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Array.Copy(Encoding.GetEncoding(_project.CodePage).GetBytes(Password), data, Password.Length);
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VbeProtected = true;
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VisibilityState = false;
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Array.Copy(PasswordKey, 0, data, data.Length - 4, 4);
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//Calculate Hash
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var provider = SHA1.Create();
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PasswordHash = provider.ComputeHash(data);
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_project.ProjectID = "{00000000-0000-0000-0000-000000000000}";
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}
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}
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//public void ValidatePassword(string Password)
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//{
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//}
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}
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}
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