Current File : /home/lightco1/upgrade.lightco.com.au/libraries/fof30/Encrypt/Totp.php
<?php
/**
* @package FOF
* @copyright 2010-2017 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU GPL version 2 or later
*/
namespace FOF30\Encrypt;
defined('_JEXEC') or die;
class Totp
{
/**
* @var int The length of the resulting passcode (default: 6 digits)
*/
private $passCodeLength = 6;
/**
* @var number The PIN modulo. It is set automatically to log10(passCodeLength)
*/
private $pinModulo;
/**
* The length of the secret key, in characters (default: 10)
*
* @var int
*/
private $secretLength = 10;
/**
* The time step between successive TOTPs in seconds (default: 30 seconds)
*
* @var int
*/
private $timeStep = 30;
/**
* The Base32 encoder class
*
* @var Base32|null
*/
private $base32 = null;
/**
* Initialises an RFC6238-compatible TOTP generator. Please note that this
* class does not implement the constraint in the last paragraph of ยง5.2
* of RFC6238. It's up to you to ensure that the same user/device does not
* retry validation within the same Time Step.
*
* @param int $timeStep The Time Step (in seconds). Use 30 to be compatible with Google Authenticator.
* @param int $passCodeLength The generated passcode length. Default: 6 digits.
* @param int $secretLength The length of the secret key. Default: 10 bytes (80 bits).
* @param Base32 $base32 The base32 en/decrypter
*/
public function __construct($timeStep = 30, $passCodeLength = 6, $secretLength = 10, Base32 $base32 = null)
{
$this->timeStep = $timeStep;
$this->passCodeLength = $passCodeLength;
$this->secretLength = $secretLength;
$this->pinModulo = pow(10, $this->passCodeLength);
if (is_null($base32))
{
$this->base32 = new Base32();
}
else
{
$this->base32 = $base32;
}
}
/**
* Get the time period based on the $time timestamp and the Time Step
* defined. If $time is skipped or set to null the current timestamp will
* be used.
*
* @param int|null $time Timestamp
*
* @return int The time period since the UNIX Epoch
*/
public function getPeriod($time = null)
{
if (is_null($time))
{
$time = time();
}
$period = floor($time / $this->timeStep);
return $period;
}
/**
* Check is the given passcode $code is a valid TOTP generated using secret
* key $secret
*
* @param string $secret The Base32-encoded secret key
* @param string $code The passcode to check
* @param int $time The time to check it against. Leave null to check for the current server time.
*
* @return boolean True if the code is valid
*/
public function checkCode($secret, $code, $time = null)
{
$time = $this->getPeriod($time);
for ($i = -1; $i <= 1; $i++)
{
if ($this->getCode($secret, ($time + $i) * $this->timeStep) == $code)
{
return true;
}
}
return false;
}
/**
* Gets the TOTP passcode for a given secret key $secret and a given UNIX
* timestamp $time
*
* @param string $secret The Base32-encoded secret key
* @param int $time UNIX timestamp
*
* @return string
*/
public function getCode($secret, $time = null)
{
$period = $this->getPeriod($time);
$secret = $this->base32->decode($secret);
$time = pack("N", $period);
$time = str_pad($time, 8, chr(0), STR_PAD_LEFT);
$hash = hash_hmac('sha1', $time, $secret, true);
$offset = ord(substr($hash, -1));
$offset = $offset & 0xF;
$truncatedHash = $this->hashToInt($hash, $offset) & 0x7FFFFFFF;
$pinValue = str_pad($truncatedHash % $this->pinModulo, $this->passCodeLength, "0", STR_PAD_LEFT);
return $pinValue;
}
/**
* Extracts a part of a hash as an integer
*
* @param string $bytes The hash
* @param string $start The char to start from (0 = first char)
*
* @return string
*/
protected function hashToInt($bytes, $start)
{
$input = substr($bytes, $start, strlen($bytes) - $start);
$val2 = unpack("N", substr($input, 0, 4));
return $val2[1];
}
/**
* Returns a QR code URL for easy setup of TOTP apps like Google Authenticator
*
* @param string $user User
* @param string $hostname Hostname
* @param string $secret Secret string
*
* @return string
*/
public function getUrl($user, $hostname, $secret)
{
$url = sprintf("otpauth://totp/%s@%s?secret=%s", $user, $hostname, $secret);
$encoder = "https://chart.googleapis.com/chart?chs=200x200&chld=Q|2&cht=qr&chl=";
$encoderURL = $encoder . urlencode($url);
return $encoderURL;
}
/**
* Generates a (semi-)random Secret Key for TOTP generation
*
* @return string
*/
public function generateSecret()
{
$secret = "";
for ($i = 1; $i <= $this->secretLength; $i++)
{
$c = rand(0, 255);
$secret .= pack("c", $c);
}
return $this->base32->encode($secret);
}
}
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