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101 lines
3.7 KiB
C#
101 lines
3.7 KiB
C#
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/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2013 Thomas Braun, Jens Klingen, Robin Krom
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*
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* For more information see: http://getgreenshot.org/
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* The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 1 of the License, or
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* (at your option) any later version.
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*
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* This program 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. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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namespace GreenshotPlugin.Core
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{
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public static class EncryptionHelper
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{
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private const string RGBIV = "dlgjowejgogkklwj";
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private const string KEY = "lsjvkwhvwujkagfauguwcsjgu2wueuff";
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/// <summary>
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/// A simply rijndael aes encryption, can be used to store passwords
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/// </summary>
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/// <param name="ClearText">the string to call upon</param>
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/// <returns>an encryped string in base64 form</returns>
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public static string Encrypt(this string ClearText)
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{
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string returnValue = ClearText;
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try
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{
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byte[] clearTextBytes = Encoding.ASCII.GetBytes(ClearText);
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SymmetricAlgorithm rijn = SymmetricAlgorithm.Create();
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using (MemoryStream ms = new MemoryStream())
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{
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byte[] rgbIV = Encoding.ASCII.GetBytes(RGBIV);
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byte[] key = Encoding.ASCII.GetBytes(KEY);
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CryptoStream cs = new CryptoStream(ms, rijn.CreateEncryptor(key, rgbIV), CryptoStreamMode.Write);
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cs.Write(clearTextBytes, 0, clearTextBytes.Length);
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cs.Close();
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returnValue = Convert.ToBase64String(ms.ToArray());
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}
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}
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catch (Exception ex)
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{
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LOG.ErrorFormat("Error encrypting, error: ", ex.Message);
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}
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return returnValue;
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}
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/// <summary>
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/// A simply rijndael aes decryption, can be used to store passwords
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/// </summary>
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/// <param name="EncryptedText">a base64 encoded rijndael encrypted string</param>
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/// <returns>Decrypeted text</returns>
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public static string Decrypt(this string EncryptedText)
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{
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string returnValue = EncryptedText;
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try
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{
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byte[] encryptedTextBytes = Convert.FromBase64String(EncryptedText);
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using (MemoryStream ms = new MemoryStream())
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{
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SymmetricAlgorithm rijn = SymmetricAlgorithm.Create();
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byte[] rgbIV = Encoding.ASCII.GetBytes(RGBIV);
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byte[] key = Encoding.ASCII.GetBytes(KEY);
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CryptoStream cs = new CryptoStream(ms, rijn.CreateDecryptor(key, rgbIV),
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CryptoStreamMode.Write);
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cs.Write(encryptedTextBytes, 0, encryptedTextBytes.Length);
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cs.Close();
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returnValue = Encoding.ASCII.GetString(ms.ToArray());
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}
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}
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catch (Exception ex)
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{
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LOG.ErrorFormat("Error decrypting {0}, error: ", EncryptedText, ex.Message);
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}
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return returnValue;
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}
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}
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}
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