C#编写DES加密、解密类

using System;using System.Security.Cryptography; using System.Text;namespace DotNet.Utilities{  /// <summary>  /// DES加密/解密类。  /// </summary>  public class DESEncrypt  {    public DESEncrypt()    {         }     #region ========加密========     /// <summary>    /// 加密    /// </summary>    /// <param name="Text"></param>    /// <returns></returns>    public static string Encrypt(string Text)    {      return Encrypt(Text,"sharejs.com");    }    /// <summary>    /// 加密数据    /// </summary>    /// <param name="Text"></param>    /// <param name="sKey"></param>    /// <returns></returns>    public static string Encrypt(string Text,string sKey)    {      DESCryptoServiceProvider des = new DESCryptoServiceProvider();      byte[] inputByteArray;      inputByteArray=Encoding.Default.GetBytes(Text);      des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));      des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));      System.IO.MemoryStream ms=new System.IO.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);      }      return ret.ToString();    }     #endregion         #region ========解密========       /// <summary>    /// 解密    /// </summary>    /// <param name="Text"></param>    /// <returns></returns>    public static string Decrypt(string Text)    {      return Decrypt(Text,"sharejs.com");    }    /// <summary>    /// 解密数据    /// </summary>    /// <param name="Text"></param>    /// <param name="sKey"></param>    /// <returns></returns>    public static string Decrypt(string Text,string sKey)    {      DESCryptoServiceProvider des = new DESCryptoServiceProvider();      int len;      len=Text.Length/2;      byte[] inputByteArray = new byte[len];      int x,i;      for(x=0;x<len;x++)      {        i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);        inputByteArray[x]=(byte)i;      }      des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));      des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));      System.IO.MemoryStream ms=new System.IO.MemoryStream();      CryptoStream cs=new CryptoStream(ms,des.CreateDecryptor(),CryptoStreamMode.Write);      cs.Write(inputByteArray,0,inputByteArray.Length);      cs.FlushFinalBlock();      return Encoding.Default.GetString(ms.ToArray());    }     #endregion    }}

///<summary><![CDATA[加密解密帮助类]]></summary>   public class Help_Encrypt   {      ///<summary><![CDATA[字符串DES加密函数]]></summary>     ///<param name="str"><![CDATA[被加密字符串 ]]></param>     ///<param name="key"><![CDATA[密钥 ]]></param>      ///<returns><![CDATA[加密后字符串]]></returns>       public static string Encode(string str, string key)     {       try       {         DESCryptoServiceProvider provider = new DESCryptoServiceProvider();         provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));         provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));         byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str);         MemoryStream stream = new MemoryStream();         CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);         stream2.Write(bytes, 0, bytes.Length);         stream2.FlushFinalBlock();         StringBuilder builder = new StringBuilder();         foreach (byte num in stream.ToArray())         {           builder.AppendFormat("{0:X2}", num);         }         stream.Close();         return builder.ToString();       }       catch (Exception) { return "xxxx"; }     }     ///<summary><![CDATA[字符串DES解密函数]]></summary>     ///<param name="str"><![CDATA[被解密字符串 ]]></param>     ///<param name="key"><![CDATA[密钥 ]]></param>      ///<returns><![CDATA[解密后字符串]]></returns>       public static string Decode(string str, string key)     {       try       {         DESCryptoServiceProvider provider = new DESCryptoServiceProvider();         provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));         provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));         byte[] buffer = new byte[str.Length / 2];         for (int i = 0; i < (str.Length / 2); i++)         {           int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);           buffer[i] = (byte)num2;         }         MemoryStream stream = new MemoryStream();         CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);         stream2.Write(buffer, 0, buffer.Length);         stream2.FlushFinalBlock();         stream.Close();         return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());       }       catch (Exception) { return ""; }     }   } JAVADES加密解密类 package com.bgxt.messages; import java.io.UnsupportedEncodingException; import java.security.*; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec;  import javax.crypto.spec.IvParameterSpec; /** * 字符串工具集合 * @author Liudong */ public class StringUtils {  private static final String PASSWORD_CRYPT_KEY = XmlUtil.getConfig().getPasswdKey().substring(0,8);  //private final static String DES = "DES";  //private static final 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 String encrypt(String value){ String result=""; try{ value=java.net.URLEncoder.encode(value, "utf-8");  result=toHexString(encrypt(value, PASSWORD_CRYPT_KEY)).toUpperCase(); }catch(Exception ex){   ex.printStackTrace();   return ""; } return result;  } 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 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();   }   public static void main(String[] args) throws Exception {     String value="01";     System.out.println("加密数据:"+value);    System.out.println("密码为:"+XmlUtil.getConfig().getPasswdKey());    String a=encrypt( value);     System.out.println("加密后的数据为:"+a);   }   }