README

A simple library to work with JSON Web Key based on the RFC 7517.

Installation

You can install the package via Composer:

composer require token/jwk

Usage

Create a key

use Token\JWK\Key;

$key = new Key();
$key->setKeyId('key-1');
$key->setKeyType('RSA');
$key->setPublicKeyUse('sig');
$key->push([
    "n" => "z24W4Hs...",
    "e" => "AQAB",
]);
$key->put('other', 'other-value');

echo $key->jsonSerialize();

Output:

{
    "kid": "key-1",
    "use": "sig",
    "kty": "RSA",
    "n": "z24W4Hs...",
    "e": "AQAB",
    "other": "other-value"
}

Create a KeySet from a publicKey

use Token\JWK\KeyFactory;
use Token\JWK\KeySet;

$publicKey = file_get_contents('public.pem');
$key       = KeyFactory::createFromPem($publicKey);
$keys      = new KeySet();
$keys->addKey($key);
echo $keys->jsonSerialize();

Output:

{
    "keys": [
        {
            "use": "sig",
            "kty": "RSA",
            "n": "...",
            "e": "...",
            "kid": "urn:ietf:params:oauth:jwk-thumbprint:sha-256:ef-cEOUom1NztLRBBWGQjmRyaYCK4NwggwOdw-CXfAc"
        }
    ]
}

Parse a KeySet

use Token\JWK\KeySetFactory;

$keys = $keys->jsonSerialize();
foreach (KeySetFactory::createFromJSON($keys) as $key) {
    var_dump($key->getKeyId());
    var_dump($key->getPrivateKey());
    var_dump($key->getPublicKey());
}
var_dump(KeySetFactory::createFromJSON($keys)->toArray());
var_dump(KeySetFactory::createFromJSON($keys)->jsonSerialize());
var_dump(KeySetFactory::createFromJSON($keys)->toString());
var_dump(KeySetFactory::createFromJSON($keys)->getKeyById('S7_qdQ')->getKeyType());
var_dump(KeySetFactory::createFromJSON($keys)->getKeyById('S7_qdQ')->getPublicKey());

Customizing Key Thumbprint Calculation

The Key::computeThumbprint() static method allows you to customize how a JWK (JSON Web Key) thumbprint is computed. This is useful when you want to define your own logic for generating a unique key identifier.

Example 1: Use a Custom Closure

You can define your own thumbprint logic using a closure:

use Token\JWK\Key;

Key::computeThumbprint(function (array $keyData) {
    return md5(json_encode($keyData));
});

This will override the default thumbprint behavior, using an MD5 hash of the serialized key data.

Example 2: Use a Static Method as Callable

You can also use a static method from a custom class:

use Token\JWK\Key;
use Token\JWK\Thumbprint\ThumbprintURI;

Key::computeThumbprint([ThumbprintURI::class, 'computeThumbprintURI']);

This approach delegates the thumbprint generation to the computeThumbprintURI() method inside the ThumbprintURI class.

Note

• The callback must be a callable that receives an array representing the JWK and returns a string thumbprint.

License

Nacosvel Contracts is made available under the MIT License (MIT). Please see License File for more information.