原文:php实现和c#一致的DES加密解密

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

}     

<?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 );

	}

}

?>