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HOTP - PHP Based HMAC One Time Passwords ======================================== **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**: ```php 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... ```php $result->toString(); $result->toHex(); $result->doDec(); // how many digits in your OTP? $result->toHotp( $length ); ```
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