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() / ];

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

    {

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

        int byteValue = Integer.parseInt(byteString, );

        digest[i] = (byte)byteValue;

    }

    return digest;

}

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

{

    String key = "";

    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 = ; i < b.length; i++)

    {

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

        if (plainText.length() < )

            plainText = "" + 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

        //

    }

}