PHP library to interface with the Yubikey REST API

3.6 2024-04-04 13:24 UTC

This package is auto-updated.

Last update: 2024-05-04 13:43:12 UTC


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This library lets you easily interface with the Yubico REST API for validating the codes created by the Yubikey.


  • An API as requested from the Yubico site
  • A client ID requested from Yubico
  • A Yubikey to test out the implementation


Use the followng command to install the library via Composer:

composer require enygma/yubikey


Look at the test.php example script to see how to use it. This can be executed like:

php test.php [generated key]

Example code:

$apiKey = 'dGVzdGluZzEyMzQ1Njc4OTA=';
$clientId = '12345';

$v = new \Yubikey\Validate($apiKey, $clientId);
$response = $v->check($inputtedKey);

echo ($response->success() === true) ? 'success!' : 'you failed. aw.';


By default the library will try to use a HTTPS request to the host given. If you need to disable this for some reason (like no SSL support), you can use the setUseSecure method and set it to false:

$v = new \Yubikey\Validate($apiKey, $clientId);

Overriding hosts

The library comes with a set of hostnames for the Yubico external API servers (api.yubico.com through api5.yubico.com). If you ever have a need to override these, you can use setHosts:

$v = new \Yubikey\Validate($apiKey, $clientId);

Remember, this will overwrite the current hosts in the class, so be sure you don't still need those. If you just want to add another host, look at the addHost method.

Multi-Server Requests:

Additonally, the library also supports simultaneous connections to multiple servers. By default it will only make the request to the first server in the hosts list. You can enable the multi-server checking with a second parameter on the check() method:

$v = new \Yubikey\Validate($apiKey, $clientId);
$response = $v->check($inputtedKey, true);

echo ($response->success() === true) ? 'success!' : 'you failed. aw.';

This will make multiple requests and return the pass/fail status of the aggregate responses from each. So, if you have all but one server pass, the overall response will be a fail. If all return OK though, you're in the clear.

"First in" result

Additionally, you can also switch on and off this aggregation of the results and go with only the "first in" response. You do this with a flag on the success checking method:

$v = new \Yubikey\Validate($apiKey, $clientId);
$response = $v->check($inputtedKey, true);

echo ($response->success(true) === true) ? 'success!' : 'you failed. aw.';

NOTE: This will still work without multi-server checking. The "first in" will just always be the single response.

@author Chris Cornutt ccornutt@phpdeveloper.org