(PHP Extension) Create JWT Using HS256, HS384, or HS512

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// Demonstrates how to create an HMAC JWT using a shared secret (password).

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$jwt = new CkJwt();

// Build the JOSE header
$jose = new CkJsonObject();
// Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
$success = $jose->AppendString('alg','HS256');
$success = $jose->AppendString('typ','JWT');

// Now build the JWT claims (also known as the payload)
$claims = new CkJsonObject();
$success = $claims->AppendString('iss','http://example.org');
$success = $claims->AppendString('sub','John');
$success = $claims->AppendString('aud','http://example.com');

// Set the timestamp of when the JWT was created to now.
$curDateTime = $jwt->GenNumericDate(0);
$success = $claims->AddIntAt(-1,'iat',$curDateTime);

// Set the "not process before" timestamp to now.
$success = $claims->AddIntAt(-1,'nbf',$curDateTime);

// Set the timestamp defining an expiration time (end time) for the token
// to be now + 1 hour (3600 seconds)
$success = $claims->AddIntAt(-1,'exp',$curDateTime + 3600);

// Produce the smallest possible JWT:
$jwt->put_AutoCompact(true);

$strJwt = $jwt->createJwt($jose->emit(),$claims->emit(),'secret');

print $strJwt . "\n";

?>