<?php
class Crumb
{
const SALT = 'http:test.com';
static $ttl = 7200;
static public function issueCrumb($uid, $ttl=7200, $action= -1)
{
if(intval($ttl)>7200) self::$ttl = $ttl;
$i = ceil(time() / self::$ttl);
return substr(self::challenge($i . $action . $uid), -12, 10);
}
static public function challenge($data)
{
return hash_hmac('md5',$data, self::SALT);
}
static public function verifyCrumb($uid,$crumb, $action= -1)
{
$i = ceil(time() / self::$ttl);
if(substr(self::challenge($i . $action . $uid), -12, 10) == $crumb || substr(self::challenge(($i-1) . $action . $uid), -12, 10) == $crumb){
return true;
}else{
return false;
}
}
}
$crumb = Crumb::issueCrumb(1);
//var_dump($crumb);
//die;
$crumb = 'fc3c0f7c23';
$ver = Crumb::verifyCrumb(1,$crumb);
var_dump($ver);