using System;

using System.Collections.Generic;

using System.Text;

using System.Security.Cryptography;

using System.IO;

 

namespace Regent.TCommons

{ 

    /// <summary>

    /// '********************************************************

    /// 模块名称：    安全类

    /// 模块功能：   常用的对称加密算法代码。

    /// </summary>

    public class TSecurity

    {

#if debug

        public 

#endif

        static byte[] K_KEY = new byte[] { 111, 122, 112, 103, 109, 111, 110, 100 };

 

#if debug

        public 

#endif

        static byte[] K_VI = new byte[] { 121, 108, 10, 110, 119, 97, 110, 103 };

        /// <summary>

        /// 编码字符串

        /// </summary>

        /// <param name="data"></param>

        /// <returns></returns>

        public static string Encode(string data)

        {

            DES des = DES.Create();

 

            des.Key = K_KEY;

            des.IV = K_VI;

 

            MemoryStream mStream = new MemoryStream();

 

            CryptoStream cStream = new CryptoStream(mStream,

                des.CreateEncryptor(),

                CryptoStreamMode.Write);

 

            byte[] toEncrypt = ASCIIEncoding.UTF8.GetBytes(data);

            cStream.Write(toEncrypt, 0, toEncrypt.Length);

            cStream.FlushFinalBlock();

            byte[] bs = mStream.ToArray();

            cStream.Close();

            mStream.Close();

 

            return Convert.ToBase64String(bs);

        }

        /// <summary>

        /// 解码字符串

        /// </summary>

        /// <param name="data"></param>

        /// <returns></returns>

 

        public static string Decode(string data)

        {

            byte[] bytes = Convert.FromBase64String(data);

 

            MemoryStream msDecrypt = new MemoryStream(bytes);

            DES des = DES.Create();

            des.Key = K_KEY;

            des.IV = K_VI;

 

            CryptoStream csDecrypt = new CryptoStream(msDecrypt,

                des.CreateDecryptor(),

                CryptoStreamMode.Read);

 

            byte[] fromEncrypt = new byte[data.Length];

 

            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);

            return ASCIIEncoding.UTF8.GetString(fromEncrypt).Trim('\0');

        }

    }

}