/// <summary>        /// DES加密        /// </summary>        /// <param name="pToEncrypt"></param>        /// <param name="sKey"></param>        /// <returns></returns>        public static string DESEncrypt(string pToEncrypt, string sKey)        {            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);            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();        }        /// <summary>        /// DES解密        /// </summary>        /// <param name="pToDecrypt"></param>        /// <param name="sKey"></param>        /// <returns></returns>        public static string DESDecrypt(string pToDecrypt, string sKey)        {            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());        }

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_encrypt (MCRYPT_DES, $this->key, $str, MCRYPT_MODE_CBC, $this->iv ) ) );    }    function decrypt($str) {        //解密        $strBin = $this->hex2bin( strtolower( $str ) );        $str = mcrypt_decrypt ( MCRYPT_DES, $this->key, $strBin, MCRYPT_MODE_CBC, $this->iv );        $str = $this->pkcs5Unpad( $str );        return $str;    }    function hex2bin($hexData) {        $binDatahttp://www.mamicode.com/= "";        for($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 );    }}