php

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 ); } } ?>

c#

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace WindowsFormsApplication1
{
///

/// DES加密解密字符串 ///

public class DesEncryption
{
///

/// DES加密字符串 ///

/// 待加密的字符串
/// 加密密钥,要求为8位
/// 加密成功返回加密后的字符串，失败返回null
public static string EncryptDES(string encryptString, string encryptKey = "")
{
try
{
byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(encryptKey.Substring(, ));
byte[] rgbIV = rgbKey;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, , inputByteArray.Length);
cStream.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in mStream.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}
catch
{
return null;
}
}

/// <summary>  
/// DES解密字符串  
/// </summary>  
/// <param name="decryptString">待解密的字符串</param>  
/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>  
/// <returns>解密成功返回解密后的字符串，失败返回null</returns>  
public static string DecryptDES(string decryptString, string decryptKey = "")  
{  
  try  
  {  
    byte\[\] rgbKey = ASCIIEncoding.ASCII.GetBytes(decryptKey);  
    byte\[\] rgbIV = rgbKey;  
    byte\[\] inputByteArray = new byte\[decryptString.Length / \];  
    for (int x = ; x < decryptString.Length / ; x++)  
    {  
      int i = (Convert.ToInt32(decryptString.Substring(x \* , ), ));  
      inputByteArray\[x\] = (byte)i;  
    }  
    DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();  
    MemoryStream mStream = new MemoryStream();  
    CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);  
    cStream.Write(inputByteArray, , inputByteArray.Length);  
    cStream.FlushFinalBlock();  
    return Encoding.UTF8.GetString(mStream.ToArray());  
  }  
  catch  
  {  
    return null;  
  }  
}  

}
}