c#

[code]

//C# 版DES 加解密算法
using System;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using System.Security.Cryptography;
using System.IO;
using System.Text;
public class MyDes
{
    //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)
    {
        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 System.Text.Encoding.Default.GetString(ms.ToArray());
    }
    #endregion
}
[/code]

php

[code]

<?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 );
    }
    
}

$str="test";
$key = '12345678';
$crypt = new DES($key);

$mstr = $crypt->encrypt($str);

echo "[ $str ]加密:[ $mstr ]<br>";

$str = $crypt->decrypt($mstr);

echo "[ $mstr ]解密:[ $str ]<br>";

?>

[/code]