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：

<?phpclass 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。