import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import javax.crypto.spec.IvParameterSpec;   

public class Des {

    private byte[] desKey;   

    //解密数据

    public static String decrypt(String message,String key) throws Exception {   

            byte[] bytesrc =convertHexString(message);

            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

            DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

            SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

            IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));   

            cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);         

            byte[] retByte = cipher.doFinal(bytesrc);

            return new String(retByte);

    }   

    public static byte[] encrypt(String message, String key)

            throws Exception {

        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");   

        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));   

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);   

        return cipher.doFinal(message.getBytes("UTF-8"));

    }   

    public static byte[] convertHexString(String ss)

    {

    byte digest[] = new byte[ss.length() / 2];

    for(int i = 0; i < digest.length; i++)

    {

    String byteString = ss.substring(2 * i, 2 * i + 2);

    int byteValue = Integer.parseInt(byteString, 16);

    digest[i] = (byte)byteValue;

    }    

    return digest;

    }    

    public static void main(String[] args) throws Exception {

        String key = "12345678";

        String value="test1234 ";

        String jiami=java.net.URLEncoder.encode(value, "utf-8").toLowerCase();   

        System.out.println("加密数据:"+jiami);

        String a=toHexString(encrypt(jiami, key)).toUpperCase();   

        System.out.println("加密后的数据为:"+a);

        String b=java.net.URLDecoder.decode(decrypt(a,key), "utf-8") ;

        System.out.println("解密后的数据:"+b);   

    }   

    public static String toHexString(byte b[]) {

        StringBuffer hexString = new StringBuffer();

        for (int i = 0; i < b.length; i++) {

            String plainText = Integer.toHexString(0xff & b[i]);

            if (plainText.length() < 2)

                plainText = "0" + plainText;

            hexString.append(plainText);

        }   

        return hexString.toString();

    }   

}

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

using System.Security.Cryptography;

using System.IO;

using System.Text;

public class TestDes{

    //cookies加密密钥

    public static string DES_Key = "";  

    #region DESEnCode DES加密

    public static string DESEnCode(string pToEncrypt, string sKey)

    {

        pToEncrypt = HttpContext.Current.Server.UrlEncode(pToEncrypt);

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();

        byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);   

        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

        MemoryStream ms = new MemoryStream();

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

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

        cs.FlushFinalBlock();   

        StringBuilder ret = new StringBuilder();

        foreach (byte b in ms.ToArray())

        {

            ret.AppendFormat("{0:X2}", b);

        }

        ret.ToString();

        return ret.ToString();

    }

    #endregion  

    #region DESDeCode DES解密

    public static string DESDeCode(string pToDecrypt, string sKey)

    {

        //    HttpContext.Current.Response.Write(pToDecrypt + "<br>" + sKey);

        //    HttpContext.Current.Response.End();

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();   

        byte[] inputByteArray = new byte[pToDecrypt.Length / ];

        for (int x = ; x < pToDecrypt.Length / ; x++)

        {

            int i = (Convert.ToInt32(pToDecrypt.Substring(x * , ), ));

            inputByteArray[x] = (byte)i;

        }   

        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

        MemoryStream ms = new MemoryStream();

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

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

        cs.FlushFinalBlock();   

        StringBuilder ret = new StringBuilder();   

        return HttpContext.Current.Server.UrlDecode(System.Text.Encoding.Default.GetString(ms.ToArray()));

    }

    #endregion   

      public TestDes()

    {

        //

        // TODO: 在此处添加构造函数逻辑

        //

    }

}