php实现和c#一致的DES加密解密，可以从网上搜到一大堆，但是测试后发现都没法用。以下正确代码是我经过苦苦才找到的。希望大家在系统整合时能用的上。

注意：key的长度为8位以内。

//C# 版DES 加解密算法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 Des{       //加解密密钥    private static  string skey = "12345678";    //初始化向量    private static byte[] DESIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };                   #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);                                      //建立加密对象的密钥和偏移量                        //原文使用ASCIIEncoding.ASCII方法的GetBytes方法                        //使得输入密码必须输入英文文本                        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                  /// <summary>                ///                 /// </summary>                /// <param name="pToDecrypt"> 待解密的字符串</param>                /// <param name="sKey"> 解密密钥,要求为8字节,和加密密钥相同</param>                /// <returns>解密成功返回解密后的字符串，失败返源串</returns>                #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 }     

<?phpclass DES{	var $key;	var $iv; //偏移量		function DES( $key, $iv=0 ) {	//key长度8例如:1234abcd		$this->key = $key;		if( $iv == 0 ) {			$this->iv = $key; //默认以$key 作为 iv		} else {			$this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );		}	}		function encrypt($str) {	//加密，返回大写十六进制字符串		$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );		$str = $this->pkcs5Pad ( $str, $size );		return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );	}		function decrypt($str) {	//解密		$strBin = $this->hex2bin( strtolower( $str ) );		$str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );		$str = $this->pkcs5Unpad( $str );		return $str;	}		function hex2bin($hexData) {		$binData = http://www.mamicode.com/"";>

php实现和c#一致的DES加密解密