php-jwt: A PHP repository from adhocore

adhocore/jwt

If you are new to JWT or want to refresh your familiarity with it, please check jwt.io

Lightweight JSON Web Token (JWT) library for PHP7, PHP8 and beyond.
Zero dependency (no vendor bloat).
If you still use PHP5.6, use version 0.1.2

Installation

# PHP7.x, PHP8.x
composer require adhocore/jwt

# PHP5.6 (deprecated)
composer require adhocore/jwt:0.1.2

# For PHP5.4-5.5 (deprecated), use version 0.1.2 with a polyfill for https://php.net/hash_equals

Features

Six algorithms supported:

'HS256', 'HS384', 'HS512', 'RS256', 'RS384', 'RS512'

kid support.
Leeway support 0-120 seconds.
Timestamp spoofing for tests.
Passphrase support for RS* algos.

Usage

use Ahc\Jwt\JWT;

// Instantiate with key, algo, maxAge and leeway.
$jwt = new JWT('secret', 'HS256', 3600, 10);

Only the key is required. Defaults will be used for the rest:

$jwt = new JWT('secret');
// algo = HS256, maxAge = 3600, leeway = 0

For RS* algo, the key should be either a resource like below:

$key = openssl_pkey_new([
    'digest_alg' => 'sha256',
    'private_key_bits' => 1024,
    'private_key_type' => OPENSSL_KEYTYPE_RSA,
]);

OR, a string with full path to the RSA private key like below:

$key = '/path/to/rsa.key';

// Then, instantiate JWT with this key and RS* as algo:
$jwt = new JWT($key, 'RS384');

Pro You dont need to specify pub key path, that is deduced from priv key.

Generate JWT token from payload array:

$token = $jwt->encode([
    'uid'    => 1,
    'aud'    => 'http://site.com',
    'scopes' => ['user'],
    'iss'    => 'http://api.mysite.com',
]);

Retrieve the payload array:

$payload = $jwt->decode($token);

Oneliner:

$token   = (new JWT('topSecret', 'HS512', 1800))->encode(['uid' => 1, 'scopes' => ['user']]);
$payload = (new JWT('topSecret', 'HS512', 1800))->decode($token);

Pro

Can pass extra headers into encode() with second parameter:

$token = $jwt->encode($payload, ['hdr' => 'hdr_value']);

Test mocking

Spoof time() for testing token expiry:

$jwt->setTestTimestamp(time() + 10000);

// Throws Exception.
$jwt->parse($token);

Call again without parameter to stop spoofing time():

$jwt->setTestTimestamp();

Examples with `kid`

$jwt = new JWT(['key1' => 'secret1', 'key2' => 'secret2']);

// Use key2
$token = $jwt->encode(['a' => 1, 'exp' => time() + 1000], ['kid' => 'key2']);

$payload = $jwt->decode($token);

$token = $jwt->encode(['a' => 1, 'exp' => time() + 1000], ['kid' => 'key3']);
// -> Exception with message Unknown key ID key3

Stabillity

The library is now marked at version 1.*.* as being stable in functionality and API.

Integration

Phalcon

Check adhocore/phalcon-ext.

Consideration

Be aware of some security related considerations as outlined here which can be valid for any JWT implementations.

adhocore/php-jwt