File util/KeyGenerator.class.php

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<?php
/**
 * @package     Util
 * @copyright   &copy; 2005-2019 PHPBoost
 * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU/GPL-3.0
 * @author      Kevin MASSY <reidlos@phpboost.com>
 * @version     PHPBoost 5.2 - last update: 2014 12 22
 * @since       PHPBoost 3.0 - 2011 06 19
*/

class KeyGenerator
{
    public static function generate_key($length = null)
    {
        if ($length == null)
        {
            return self::string_hash(uniqid(mt_rand(), true), false);
        }
        else
        {
            return TextHelper::substr(self::string_hash(uniqid(mt_rand(), true), false), 0, $length);
        }
    }

    public static function generate_token()
    {
        return self::generate_key(16);
    }

    /**
     * Return a SHA256 hash of the $str string [with a salt]
     * @param string $string the string to hash
     * @param mixed $salt If true, add the default salt : md5($str)
     * if a string, use this string as the salt
     * if false, do not use any salt
     * @return string a SHA256 hash of the $string string [with a salt]
    */
    public static function string_hash($string, $salt = true)
    {
        if ($salt === true)
        {
            $string = md5($string) . $string;
        }
        elseif ($salt !== false)
        {
            $string = $salt . $string;
        }
        return hash('sha256', $string);
    }
}
?>