oxdecryptor.php

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<?php

class oxDecryptor
{

    public function decrypt($sString, $sKey)
    {
        $sKey = $this->_formKey($sKey, $sString);

        $sString = substr($sString, 3);
        $sString = str_replace('!', '=', $sString);
        $sString = base64_decode($sString);
        $sString = $sString ^ $sKey;

        return substr($sString, 2, -2);
    }

    protected function _formKey($sKey, $sString)
    {
        $sKey = '_' . $sKey;
        $iKeyLength = (strlen($sString) / strlen($sKey)) + 5;

        return str_repeat($sKey, $iKeyLength);
    }
}