Mega Code Archive
Encryption Helper
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//------------------------------------------------------------------------------
// The contents of this file are subject to the Microsoft Public License (Ms-PL)
// You may obtain a copy of the License at http://psadmin.codeplex.com/license.
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The initial developer is Ben Foster (ben.foster@retroviz.com)
// Copyright (c) Retroviz Limited (http://www.retroviz.com).
// All Rights Reserved.
//------------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Security;
using System.Security.Cryptography;
using System.IO;
namespace PSAdmin.Core.Utils
{
public class EncryptionHelper
{
private static string encryptionKey = "1234567890123451";
public static string Decrypt(string CipherText) {
return Decrypt(CipherText, encryptionKey);
}
protected static string Decrypt(string CipherText, string EncryptionPrivateKey) {
if (String.IsNullOrEmpty(CipherText))
return CipherText;
TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider();
tDESalg.Key = new ASCIIEncoding().GetBytes(EncryptionPrivateKey.Substring(0, 16));
tDESalg.IV = new ASCIIEncoding().GetBytes(EncryptionPrivateKey.Substring(8, 8));
byte[] buffer = Convert.FromBase64String(CipherText);
string result = DecryptTextFromMemory(buffer, tDESalg.Key, tDESalg.IV);
return result;
}
public static string Encrypt(string PlainText) {
return Encrypt(PlainText, encryptionKey);
}
protected static string Encrypt(string PlainText, string EncryptionPrivateKey)
{
if (String.IsNullOrEmpty(PlainText))
return PlainText;
TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider();
tDESalg.Key = new ASCIIEncoding().GetBytes(EncryptionPrivateKey.Substring(0, 16));
tDESalg.IV = new ASCIIEncoding().GetBytes(EncryptionPrivateKey.Substring(8, 8));
byte[] encryptedBinary = EncryptTextToMemory(PlainText, tDESalg.Key, tDESalg.IV);
string result = Convert.ToBase64String(encryptedBinary);
return result;
}
private static byte[] EncryptTextToMemory(string Data, byte[] Key, byte[] IV)
{
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, new TripleDESCryptoServiceProvider().CreateEncryptor(Key, IV), CryptoStreamMode.Write);
byte[] toEncrypt = new UnicodeEncoding().GetBytes(Data);
cStream.Write(toEncrypt, 0, toEncrypt.Length);
cStream.FlushFinalBlock();
byte[] ret = mStream.ToArray();
cStream.Close();
mStream.Close();
return ret;
}
private static string DecryptTextFromMemory(byte[] Data, byte[] Key, byte[] IV) {
MemoryStream msDecrypt = new MemoryStream(Data);
CryptoStream csDecrypt = new CryptoStream(msDecrypt, new TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), CryptoStreamMode.Read);
StreamReader sReader = new StreamReader(csDecrypt, new UnicodeEncoding());
return sReader.ReadLine();
}
}
}
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