PHP和C#可共用的可逆加密算法详解

在一些项目中要求在php中生成加密，然后在asp.net中接受过来的密码再解密，下面和大家分享一个PHP与asp.net C#可共用的可逆加密算法，感兴趣的可以参考参考。

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;
          }
        }
      }
    }

以上就是PHP和C#可共用的可逆加密算法，希望对大家的学习有所帮助。