Cryptography/DES/TripleDES.cs

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/*
 * Author: Nick Bitounis
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Security.Cryptography;
using ComLib.Extensions;

namespace ComLib.Cryptography.DES
{
    /// <summary>
    /// This class implements Triple DES encrypt and decrypt methods
    /// that operate on hexadecimal data and keys. Data to be encrypted
    /// or decrypted should be exactly 16 hexadecimal characters.
    /// </summary>
    public class TripleDES
    {
        /// <summary>
        /// Encrypts hexadecimal data using a DES key.
        /// </summary>
        /// <param name="key">DES key to use with the encrypt operation.</param>
        /// <param name="data">Hexadecimal data to encrypt.</param>
        /// <returns>Encrypted hexadecimal data.</returns>
        public static string Encrypt (DESKey key, string data)
        {
            return DESEncrypt(key.ThirdKeyPart.ToString().HexToByteArray(),
                        DESDecrypt(key.SecondKeyPart.ToString().HexToByteArray(),
                            DESEncrypt(key.FirstKeyPart.ToString().HexToByteArray(), data.HexToByteArray()))
                            ).ByteArrayToHex();
        }


        /// <summary>
        /// Decrypts hexadecimal data using a DES key.
        /// </summary>
        /// <param name="key">DES key to use with the decrypt operation.</param>
        /// <param name="data">Hexadecimal data to decrypt.</param>
        /// <returns>Decrypted hexadecimal data.</returns>
        public static string Decrypt(DESKey key, string data)
        {
            return DESDecrypt(key.FirstKeyPart.ToString().HexToByteArray(),
                        DESEncrypt(key.SecondKeyPart.ToString().HexToByteArray(),
                            DESDecrypt(key.ThirdKeyPart.ToString().HexToByteArray(), data.HexToByteArray()))
                            ).ByteArrayToHex();
        }