前几天做了个项目需要在两个系统间采用DES加密，一个系统为JAVA开发的，另外一个.Net开发的

在网上找了很多写法但加密出的数据两个系统都无法匹配，

在做了小修改以后终于可以用了，已经测试过

JAVA版本

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();   
    }   
  
}

.NET版本

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 = "12345678";  
 
    #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, 0, 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 / 2];   
        for (int x = 0; x < pToDecrypt.Length / 2; x++)   
        {   
            int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));   
            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, 0, 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   
        //   
    }   
}