ASP.NET2.0 C#加密解密

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Security;
using System.Security.Cryptography;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Specialized;

namespace Intel.User.BLL
{
    public class TripleDES
    {
        public string EncryptionString = System.Configuration.ConfigurationSettings.AppSettings["encryptKey"];
        public string EncryptionIV = System.Configuration.ConfigurationSettings.AppSettings["encryptIV"];

        public byte[] EncryptionByteData(byte[] SourceData)
        {
            byte[] returnData = null;
            try
            {

                TripleDESCryptoServiceProvider desProvider = new TripleDESCryptoServiceProvider();


                byte[] byteKey = Encoding.UTF8.GetBytes(EncryptionString);
                byte[] byteIV = Encoding.UTF8.GetBytes(EncryptionIV);
                desProvider.Key = byteKey;
                desProvider.IV = byteIV;


                MemoryStream ms = new MemoryStream();


                ICryptoTransform encrypto = desProvider.CreateEncryptor();


                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);


                cs.Write(SourceData, 0, SourceData.Length);
                cs.FlushFinalBlock();


                returnData = ms.ToArray();
            }
            catch (Exception ex)
            {
                throw ex;
            }

            return returnData;

        }


        public byte[] DecryptionByteData(byte[] SourceData)
        {
            byte[] returnData = null;
            try
            {

                TripleDESCryptoServiceProvider desProvider = new TripleDESCryptoServiceProvider();


                byte[] byteKey = Encoding.UTF8.GetBytes(EncryptionString);
                byte[] byteIV = Encoding.UTF8.GetBytes(EncryptionIV);
                desProvider.Key = byteKey;
                desProvider.IV = byteIV;


                MemoryStream ms = new MemoryStream();


                ICryptoTransform encrypto = desProvider.CreateDecryptor();


                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);


                cs.Write(SourceData, 0, SourceData.Length);
                cs.FlushFinalBlock();


                returnData = ms.ToArray();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return returnData;

        }


        public string EncryptionStringData(string SourceData)
        {
            try
            {

                byte[] SourData = Encoding.UTF8.GetBytes(SourceData);


                byte[] retData = EncryptionByteData(SourData);

                return Convert.ToBase64String(retData, 0, retData.Length);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }


        public string DecryptionStringdata(string SourceData)
        {
            try
            {

                byte[] SourData = Convert.FromBase64String(SourceData);


                byte[] retData = DecryptionByteData(SourData);


                return Encoding.UTF8.GetString(retData, 0, retData.Length);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }
}

web.config文件配置

<appSettings>    
<add key="encryptIV" value="onlinetv"/>
        <add key="APP_KEY" value="C5C5AF0C419445C16D214638358AB0C9FA7F36B1DEAEDF8D"/>

</appSettings>

注意：APP_KEY 设置24位

调用

 /// <summary>
        ///  加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string EncryptString(string str)
        {
            TripleDES l = new TripleDES();
            return l.EncryptionStringData(str);
        }
        /// <summary>
        ///  解密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DecrypString(string str)
        {
            TripleDES l = new TripleDES();
            return l.DecryptionStringdata(str);
        }