PHP は、C# と一貫した DES 暗号化および復号化メソッドを実装します。

//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  
}

<?php 
class 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) { 
    $binData = ""; 
    for($i = 0; $i < strlen ( $hexData ); $i += 2) { 
      $binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) ); 
    } 
    return $binData; 
  } 
 
  function pkcs5Pad($text, $blocksize) { 
    $pad = $blocksize - (strlen ( $text ) % $blocksize); 
    return $text . str_repeat ( chr ( $pad ), $pad ); 
  } 
   
  function pkcs5Unpad($text) { 
    $pad = ord ( $text {strlen ( $text ) - 1} ); 
    if ($pad > strlen ( $text )) 
      return false; 
    if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad) 
      return false; 
    return substr ( $text, 0, - 1 * $pad ); 
  } 
   
} 
?>