protected function __construct($scheme)
{
//handle some stuff that only needs to happen the first time we access this algorithm.
//
if (!self::$initialized) {
//if password hash doesn't exists (php version 5.5 or lower) then include compatibility library
if (!function_exists('password_hash')) {
//library also does this check but will trigger an error instead of throwing an exception
if (!function_exists('crypt')) {
throw new vB_Utility_Password_Exception_SchemeNotSupported();
}
//the library requires a security fix that was made in 5.3.7. Apparently there exist specific
//distributions of prior versions that have the patched that fix, but the specific check for
//fix is more involved and we need to keep people from causing themselves problems.
if (version_compare(PHP_VERSION, '5.3.7', '<')) {
throw new vB_Utility_Password_Exception_SchemeNotSupported();
}
require_once DIR . '/libraries/password_compat/lib/password.php';
}
self::$initialized = true;
}
//scheme specific init, need to do this every time because it could change.
//this algorithm expects exactly one parameter
$params = explode(':', $scheme);
if (count($params) != 2) {
throw new vB_Utility_Password_Exception_SchemeNotSupported();
}
$this->cost = (int) $params[1];
parent::__construct($scheme);
}
