因为工作需我们需要在php中生成加密然后在asp.net中接受过来的密码再解密，下面我找到一个PHP与asp.net C#可共用的可逆加密算法，有需要了解的同学可参考。

php加密算法

<?php
class DES {
    var $key;
    var $iv; //偏移量
    function DES($key = 11001100, $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);
    }
}
?>

asp.net程序代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
namespace WindowsFormsApplication1
{
    /// <summary>
    /// DES加密解密字符串
    /// </summary>
    public class DesEncryption
    {
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串，失败返回null</returns>
        public static string EncryptDES(string encryptString, string encryptKey = "11001100")
        {
            try
            {
                byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(encryptKey.Substring(0, 8));
                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, 0, 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 = "11001100")
        {
            try
            {
                byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(decryptKey);
                byte[] rgbIV = rgbKey;
                byte[] inputByteArray = new byte[decryptString.Length / 2];
                for (int x = 0; x < decryptString.Length / 2; x++)
                {
                    int i = (Convert.ToInt32(decryptString.Substring(x * 2, 2), 16));
                    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, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return null;
            }
        }
    }
}

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