(PHP Extension) Create JWT Using RSA (RS256, RS384, or RS512)

Demonstrates how to create a JWT using an RSA private key. This is for JOSE headers with an "alg" of RS256, RS384, or RS512. When RSA is used, the private key signs (creates) the JWT, and the public key is for verification.

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 a JWT using an RSA private key.

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

$privKey = new CkPrivateKey();

// Load an RSA private key from a PEM file.
$success = $privKey->LoadEncryptedPemFile('qa_data/pem/rsa_passwd.pem','passwd');
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

$jwt = new CkJwt();

// Build the JOSE header
$jose = new CkJsonObject();
// Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
$success = $jose->AppendString('alg','RS256');
$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);

// Create the JWT token.  This is where the RSA signature is created.
$token = $jwt->createJwtPk($jose->emit(),$claims->emit(),$privKey);

print $token . "\n";

?>