银联接口的mcrypt_cbc问题

用了php5.5 银联接口netpayclient.php 的mcrypt_cbc不能用了，该怎么替换？

  // This file is protected by copyright law & provided under license. Copyright(C) 2005-2009 www.chinapay.com, All rights reserved.// This file is protected by copyright law & provided under license. Copyright(C) 2005-2009 www.chinapay.com, All rights reserved.define("DES_KEY", "SCUBEPGW");define("HASH_PAD", "0001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff003021300906052b0e03021a05000414");bcscale(0);$private_key = array(); /*function hex2bin($hexdata) {    $bindata = '';    if (strlen($hexdata) % 2 == 1) {        $hexdata = '0' . $hexdata;    }    for ($i = 0; $i  0) {        $pad = str_repeat($chr, $padlen);        if (strtoupper($d) == 'L') {            $ret = $pad . $ret;        } else {            $ret = $ret . $pad;        }    }    return $ret;} function bin2int($bindata) {    $hexdata = bin2hex($bindata);    return bchexdec($hexdata);} function bchexdec($hexdata) {    $ret = '0';    $len = strlen($hexdata);    for ($i = 0; $i = 0) {        $result = bcsub($a, $b);    } else {        $result = bcsub($b, $a);        $result = bcsub($p, $result);    }    $result = bcmod($result, $p);    $result = bcmul($result, $u);    $result = bcmod($result, $p);    $result = bcmul($result, $q);    $result = bcadd($result, $b);    $ret = bcdechex($result);    $ret = strtoupper(padstr($ret));    return (strlen($ret) == 256) ? $ret : false;} function rsa_decrypt($input) {    global $private_key;    $check = bchexdec($input);    $modulus = bin2int($private_key["modulus"]);    $exponent = bchexdec("010001");    $result = bcpowmod($check, $exponent, $modulus);    $rb = bcdechex($result);    return strtoupper(padstr($rb));} function buildKey($key) {    global $private_key;    if (count($private_key) > 0) {        foreach ($private_key as $name => $value) {            unset($private_key[$name]);        }    }    $ret = false;    $key_file = parse_ini_file($key);    if (!$key_file) {        return $ret;    }    $hex = "";    if (array_key_exists("MERID", $key_file)) {        $ret = $key_file["MERID"];        $private_key["MERID"] = $ret;        $hex = substr($key_file["prikeyS"], 80);    } else    if (array_key_exists("PGID", $key_file)) {        $ret = $key_file["PGID"];        $private_key["PGID"] = $ret;        $hex = substr($key_file["pubkeyS"], 48);    } else {        return $ret;    }    $bin = hex2bin($hex);    $private_key["modulus"] = substr($bin, 0, 128);    $cipher = MCRYPT_DES;    $iv = str_repeat("\x00", 8);    $prime1 = substr($bin, 384, 64);    $enc = mcrypt_cbc($cipher, DES_KEY, $prime1, MCRYPT_DECRYPT, $iv);    $private_key["prime1"] = $enc;    $prime2 = substr($bin, 448, 64);    $enc = mcrypt_cbc($cipher, DES_KEY, $prime2, MCRYPT_DECRYPT, $iv);    $private_key["prime2"] = $enc;    $prime_exponent1 = substr($bin, 512, 64);    $enc = mcrypt_cbc($cipher, DES_KEY, $prime_exponent1, MCRYPT_DECRYPT, $iv);    $private_key["prime_exponent1"] = $enc;    $prime_exponent2 = substr($bin, 576, 64);    $enc = mcrypt_cbc($cipher, DES_KEY, $prime_exponent2, MCRYPT_DECRYPT, $iv);    $private_key["prime_exponent2"] = $enc;    $coefficient = substr($bin, 640, 64);    $enc = mcrypt_cbc($cipher, DES_KEY, $coefficient, MCRYPT_DECRYPT, $iv);    $private_key["coefficient"] = $enc;    return $ret;} function sign($msg) {    global $private_key;    if (!array_key_exists("MERID", $private_key)) {        return false;    }    $hb = sha1_128($msg);    return rsa_encrypt($private_key, $hb);} function signOrder($merid, $ordno, $amount, $curyid, $transdate, $transtype) {    if (strlen($merid) != 15)        return false;    if (strlen($ordno) != 16)        return false;    if (strlen($amount) != 12)        return false;    if (strlen($curyid) != 3)        return false;    if (strlen($transdate) != 8)        return false;    if (strlen($transtype) != 4)        return false;    $plain = $merid . $ordno . $amount . $curyid . $transdate . $transtype;    return sign($plain);} function verify($plain, $check) {    global $private_key;    if (!array_key_exists("PGID", $private_key)) {        return false;    }    if (strlen($check) != 256) {        return false;    }    $hb = sha1_128($plain);    $hbhex = strtoupper(bin2hex($hb));    $rbhex = rsa_decrypt($check);    return $hbhex == $rbhex ? true : false;} function verifyTransResponse($merid, $ordno, $amount, $curyid, $transdate, $transtype, $ordstatus, $check) {    if (strlen($merid) != 15)        return false;    if (strlen($ordno) != 16)        return false;    if (strlen($amount) != 12)        return false;    if (strlen($curyid) != 3)        return false;    if (strlen($transdate) != 8)        return false;    if (strlen($transtype) != 4)        return false;    if (strlen($ordstatus) != 4)        return false;    if (strlen($check) != 256)        return false;    $plain = $merid . $ordno . $amount . $curyid . $transdate . $transtype . $ordstatus;    return verify($plain, $check);}

回复讨论(解决方案)

自PHP 5.5.0起,此函数已经被废弃。强烈建议不要使用此函数 。
http://www.php.net/manual/zh/function.mcrypt-cbc.php

我知道弃用了，但是银联的接口用的就是这个，我想知道怎么改，谢谢