using System;

using System.Text;

using System.Security.Cryptography;

using System.IO;

namespace DESPwd

{

    public class DESUtil

    {

        static DESCryptoServiceProvider des = new DESCryptoServiceProvider();

        public static DESCryptoServiceProvider DES

        {

            get { return des; }

        }

        const string EncryptionKey = "诺丽科技";

        const string EncryptionIV = "kell";

        public static string Encoder(string input)

        {

            byte[] SourceData = Encoding.Unicode.GetBytes(input);

            byte[] returnData = null;

            try

            {

                des.Key = ASCIIEncoding.Unicode.GetBytes(EncryptionKey);

                des.IV = ASCIIEncoding.Unicode.GetBytes(EncryptionIV);

                MemoryStream ms = new MemoryStream();

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

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

                cs.FlushFinalBlock();

                returnData = ms.ToArray();

            }

            catch (Exception ex)

            {

                throw ex;

            }

            return Encoding.Unicode.GetString(returnData);

        }

        public static string Decoder(string input)

        {

            byte[] SourceData = Encoding.Unicode.GetBytes(input);

            byte[] returnData = null;

            try

            {

                DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();

                desProvider.Key = Encoding.Unicode.GetBytes(EncryptionKey);

                desProvider.IV = Encoding.Unicode.GetBytes(EncryptionIV);

                MemoryStream ms = new MemoryStream();

                ICryptoTransform encrypto = desProvider.CreateDecryptor();

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

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

                cs.FlushFinalBlock();

                returnData = ms.ToArray();

            }

            catch (Exception ex)

            {

                throw ex;

            }

            return Encoding.Unicode.GetString(returnData);

        }

    }

}

using System;

using System.Windows.Forms;

namespace DESPwd

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button10_Click(object sender, EventArgs e)

        {

            textBox9.Text = DESUtil.Encoder(textBox8.Text);

        }

        private void button11_Click(object sender, EventArgs e)

        {

            textBox11.Text = DESUtil.Decoder(textBox9.Text);

        }

    }

}