CFDBDeobfuscate.php

<?php
/*
    "Contact Form to Database" Copyright (C) 2011-2014 Michael Simpson  (email : michael.d.simpson@gmail.com)

    This file is part of Contact Form to Database.

    Contact Form to Database is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Contact Form to Database is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Contact Form to Database.
    If not, see <http://www.gnu.org/licenses/>.
*/

class CFDBDeobfuscate {

    // Taken from http://ditio.net/2008/11/04/php-string-to-hex-and-hex-to-string-functions/
    static function hexToStr($hex) {
        $string = '';
        for ($i = 0; $i < strlen($hex) - 1; $i += 2) {
            $string .= chr(hexdec($hex[$i] . $hex[$i + 1]));
        }
        return $string;
    }

    static function deobfuscateHexString($hex, $key) {
        return CFDBDeobfuscate::deobfuscateString(CFDBDeobfuscate::hexToStr($hex), $key);
    }

    static function deobfuscateString($string, $key) {
        return mcrypt_decrypt(MCRYPT_3DES, $key, $string, 'ecb');
    }


}