diff options
| -rw-r--r-- | src/Otp.php | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/src/Otp.php b/src/Otp.php index 1df9782..6fd49e8 100644 --- a/src/Otp.php +++ b/src/Otp.php @@ -56,6 +56,13 @@ class Otp implements OtpInterface * @var string */ protected $algorithm = 'sha1'; + + /** + * Time offset between system time and GMT in seconds + * + * @var integer + */ + protected $totpOffset = 0; /* (non-PHPdoc) * @see Otp.OtpInterface::hotp() @@ -252,6 +259,34 @@ class Otp implements OtpInterface { return $this->digits; } + + /** + * Set offset between system time and GMT + * + * @param integer $offset GMT - time() + * @throws \InvalidArgumentException + * @return \Otp\Otp + */ + public function setTotpOffset($offset) + { + if (!is_int($offset)) { + throw new \InvalidArgumentException('Offset must be an integer'); + } + + $this->totpOffset = $offset; + + return $this; + } + + /** + * Returns offset between system time and GMT in seconds + * + * @return integer + */ + public function getTotpOffset() + { + return $this->totpOffset; + } /** * Generates a binary counter for hashing @@ -275,7 +310,7 @@ class Otp implements OtpInterface */ private function getTimecounter() { - return floor(time() / $this->period); + return floor((time() + $this->totpOffset) / $this->period); } /** |