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File: README.md
Role: Documentation
Content type: text/markdown
Description: Documentation
Class: Pure PHP Yubikey Local OTP Authentication
Check a YubiKey OTP authentication locally
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YubiKey PHP class

Yubikey PHP class is a GNU LGPL class to check a YubiKey authentication locally

(c) 2014-2015 SysCo systemes de communication sa The Yubikey PHP class is a subset of the multiOTP open source project. http://www.multiOTP.net/

Current build: 4.3.2.0 (2015-01-04)

No external file is needed (no PEAR, no PECL).

AES 128 encryption and decryption algorithms using pure PHP code (LGPLv2.1) from Jose Manuel Busto Lopez is directly integrated in the source code.

In Yubico OTP mode, when the YubiKey button is pressed, the returned string is 44 characters long, with 12 characters for the fixed public id, and 32 characters for the dynamic OTP part. With the 12 characters of the public id, the right AES key (the secret) can be retrieved from your user identification handler to decrypt the dynamic OTP part.

Usage

<?php
    require_once('yubikey.class.php');
    $yubikey = new Yubikey();
    $result = $yubikey->checkYubicoOtp($yubico_modhex_encrypted_part,
                                       $secret,
                                       $last_valid_position);
?>

Possible returned value is one of the following:


          OK  The OTP is valid.
     BAD_OTP  The OTP is invalid format.
REPLAYED_OTP  The OTP has already been used.

Check yubikey.demo.php for a full implementation example.

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