What is HOTP: HOTP is a class that simplifies One Time Password systems for PHP Authentication. The HOTP/TOTP Algorithms have been around for a bit, so this is a straightforward class to meet the test vector requirements.
What works with HOTP/TOTP: It's been tested to the test vectors, and I've verified the time-sync hashes against the following:
- Android: Mobile-OTP
- iPhone: OATH Token
Why would I use this: Who wouldn't love a simple drop-in class for HMAC Based One Time Passwords? It's a great extra layer of security (creating two-factor auth) and it's pretty darn zippy.
Okay you sold me. Give me some docs:
use jakobo\HOTP\HOTP;
// event based
$result = HOTP::generateByCounter( $key, $counter );
// time based within a "window" of time
$result = HOTP::generateByTime( $key, $window );
// same as generateByTime, but for $min windows before and $max windows after
$result = HOTP::generateByTimeWindow( $key, $window, $min, $max );with $result, you can do all sorts of neat things...
$result->toString();
$result->toHex();
$result->toDec();
// how many digits in your OTP?
$result->toHotp( $length );