Yubicloud PHP class

Yubicloud PHP class is a GNU LGPL class to check YubiKeys using YubiCloud.

(c) 2014-2019 SysCo systemes de communication sa
The Yubicloud PHP class is a subset of the multiOTP open source project.
http://www.multiOTP.net/

Current build: 4.3.3.2 (2019-04-24)

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

Usage

You need a Yubico API key which is free if you have at least one Yubikey. You can ask for your own key here: https://upgrade.yubico.com/getapikey/

<?php
    require_once('yubicloud.class.php');
    $yubicloud = new Yubicloud("my_client_id", "my_secret_key");
    $result = $yubicloud->checkOnYubiCloud($otp_to_check);
?>

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 seen by the service.
        BAD_SIGNATURE  The HMAC signature verification failed.
    MISSING_PARAMETER  The request lacks a parameter.
       NO_SUCH_CLIENT  The request id does not exist.
OPERATION_NOT_ALLOWED  The request id is not allowed to verify OTPs.
        BACKEND_ERROR  Unexpected error in Yubico servers. Please contact them if you see this error.
   NOT_ENOUGH_ANSWERS  Server could not get requested number of syncs during before timeout.
     REPLAYED_REQUEST  Server has seen the OTP/Nonce combination before.
            BAD_NONCE  Answer Nonce is different from the request Nonce.
     CONNECTION_ERROR  Impossible to make a connection with the YubiCloud servers.
     OTP_IS_DIFFERENT  Answer OTP is different from request OTP.
   OUT_OF_TIME_WINDOW  Timestamp difference with the Yubico servers is bigger than yubicloud_max_time_window.
       SERVER_TIMEOUT  Timeout while waiting an answer from the server.

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

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