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PHP-JWT
=======
A simple library to encode and decode JSON Web Tokens (JWT) in PHP, conforming to [RFC 7519](https://tools.ietf.org/html/rfc7519).

Installation
------------

Use composer to manage your dependencies and download PHP-JWT:

```bash
composer require firebase/php-jwt
```

Optionally, install the `paragonie/sodium_compat` package from composer if your
php is < 7.2 or does not have libsodium installed:

```bash
composer require paragonie/sodium_compat
```

Example
-------
```php
use Firebase\JWT\JWT;
use Firebase\JWT\Key;

$key = 'example_key';
$payload = [
    'iss' => 'http://example.org',
    'aud' => 'http://example.com',
    'iat' => 1356999524,
    'nbf' => 1357000000
];

/**
 * IMPORTANT:
 * You must specify supported algorithms for your application. See
 * https://tools.ietf.org/html/draft-ietf-jose-json-web-algorithms-40
 * for a list of spec-compliant algorithms.
 */
$jwt = JWT::encode($payload, $key, 'HS256');
$decoded = JWT::decode($jwt, new Key($key, 'HS256'));

print_r($decoded);

/*
 NOTE: This will now be an object instead of an associative array. To get
 an associative array, you will need to cast it as such:
*/

$decoded_array = (array) $decoded;

/**
 * You can add a leeway to account for when there is a clock skew times between
 * the signing and verifying servers. It is recommended that this leeway should
 * not be bigger than a few minutes.
 *
 * Source: http://self-issued.info/docs/draft-ietf-oauth-json-web-token.html#nbfDef
 */
JWT::$leeway = 60; // $leeway in seconds
$decoded = JWT::decode($jwt, new Key($key, 'HS256'));
```
Example with RS256 (openssl)
----------------------------
```php
use Firebase\JWT\JWT;
use Firebase\JWT\Key;

$privateKey = <<<EOD
-----BEGIN RSA PRIVATE KEY-----

B2zNzvrlgRmgBrklMTrMYgm1NPcW+bRLGcwgW2PTvNM=
-----END RSA PRIVATE KEY-----
EOD;

$publicKey = <<<EOD
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC8kGa1pSjbSYZVebtTRBLxBz5H
4i2p/llLCrEeQhta5kaQu/RnvuER4W8oDH3+3iuIYW4VQAzyqFpwuzjkDI+17t5t
0tyazyZ8JXw+KgXTxldMPEL95+qVhgXvwtihXC1c5oGbRlEDvDF6Sa53rcFVsYJ4
ehde/zUxo6UvS7UrBQIDAQAB
-----END PUBLIC KEY-----
EOD;

$payload = [
    'iss' => 'example.org',
    'aud' => 'example.com',
    'iat' => 1356999524,
    'nbf' => 1357000000
];

$jwt = JWT::encode($payload, $privateKey, 'RS256');
echo "Encode:\n" . print_r($jwt, true) . "\n";

$decoded = JWT::decode($jwt, new Key($publicKey, 'RS256'));

/*
 NOTE: This will now be an object instead of an associative array. To get
 an associative array, you will need to cast it as such:
*/

$decoded_array = (array) $decoded;
echo "Decode:\n" . print_r($decoded_array, true) . "\n";
```

Example with a passphrase
-------------------------

```php
use Firebase\JWT\JWT;
use Firebase\JWT\Key;

// Your passphrase
$passphrase = '[YOUR_PASSPHRASE]';

// Your private key file with passphrase
// Can be generated with "ssh-keygen -t rsa -m pem"
$privateKeyFile = '/path/to/key-with-passphrase.pem';

// Create a private key of type "resource"
$privateKey = openssl_pkey_get_private(
    file_get_contents($privateKeyFile),
    $passphrase
);

$payload = [
    'iss' => 'example.org',
    'aud' => 'example.com',
    'iat' => 1356999524,
    'nbf' => 1357000000
];

$jwt = JWT::encode($payload, $privateKey, 'RS256');
echo "Encode:\n" . print_r($jwt, true) . "\n";

// Get public key from the private key, or pull from from a file.
$publicKey = openssl_pkey_get_details($privateKey)['key'];

$decoded = JWT::decode($jwt, new Key($publicKey, 'RS256'));
echo "Decode:\n" . print_r((array) $decoded, true) . "\n";
```

Example with EdDSA (libsodium and Ed25519 signature)
----------------------------
```php
use Firebase\JWT\JWT;
use Firebase\JWT\Key;

// Public and private keys are expected to be Base64 encoded. The last
// non-empty line is used so that keys can be generated with
// sodium_crypto_sign_keypair(). The secret keys generated by other tools may
// need to be adjusted to match the input expected by libsodium.

$keyPair = sodium_crypto_sign_keypair();

$privateKey = base64_encode(sodium_crypto_sign_secretkey($keyPair));

$publicKey = base64_encode(sodium_crypto_sign_publickey($keyPair));

$payload = [
    'iss' => 'example.org',
    'aud' => 'example.com',
    'iat' => 1356999524,
    'nbf' => 1357000000
];

$jwt = JWT::encode($payload, $privateKey, 'EdDSA');
echo "Encode:\n" . print_r($jwt, true) . "\n";

$decoded = JWT::decode($jwt, new Key($publicKey, 'EdDSA'));
echo "Decode:\n" . print_r((array) $decoded, true) . "\n";
````

Using JWKs
----------

```php
use Firebase\JWT\JWK;
use Firebase\JWT\JWT;

// Set of keys. The "keys" key is required. For example, the JSON response to
// this endpoint: https://www.gstatic.com/iap/verify/public_key-jwk
$jwks = ['keys' => []];

// JWK::parseKeySet($jwks) returns an associative array of **kid** to Firebase\JWT\Key
// objects. Pass this as the second parameter to JWT::decode.
JWT::decode($payload, JWK::parseKeySet($jwks));
```

Using Cached Key Sets
---------------------

The `CachedKeySet` class can be used to fetch and cache JWKS (JSON Web Key Sets) from a public URI.
This has the following advantages:

1. The results are cached for performance.
2. If an unrecognized key is requested, the cache is refreshed, to accomodate for key rotation.
3. If rate limiting is enabled, the JWKS URI will not make more than 10 requests a second.

```php
use Firebase\JWT\CachedKeySet;
use Firebase\JWT\JWT;

// The URI for the JWKS you wish to cache the results from
$jwksUri = 'https://www.gstatic.com/iap/verify/public_key-jwk';

// Create an HTTP client (can be any PSR-7 compatible HTTP client)
$httpClient = new GuzzleHttp\Client();

// Create an HTTP request factory (can be any PSR-17 compatible HTTP request factory)
$httpFactory = new GuzzleHttp\Psr\HttpFactory();

// Create a cache item pool (can be any PSR-6 compatible cache item pool)
$cacheItemPool = Phpfastcache\CacheManager::getInstance('files');

$keySet = new CachedKeySet(
    $jwksUri,
    $httpClient,
    $httpFactory,
    $cacheItemPool,
    null, // $expiresAfter int seconds to set the JWKS to expire
    true  // $rateLimit    true to enable rate limit of 10 RPS on lookup of invalid keys
);

$jwt = 'eyJhbGci...'; // Some JWT signed by a key from the $jwkUri above
$decoded = JWT::decode($jwt, $keySet);
```

Miscellaneous
-------------

#### Casting to array

The return value of `JWT::decode` is the generic PHP object `stdClass`. If you'd like to handle with arrays
instead, you can do the following:

```php
// return type is stdClass
$decoded = JWT::decode($payload, $keys);

// cast to array
$decoded = json_decode(json_encode($decoded), true);
```

Changelog
---------

#### 6.3.0 / 2022-07-15

 - Added ES256 support to JWK parsing ([#399](https://github.com/firebase/php-jwt/pull/399))
 - Fixed potential caching error in `CachedKeySet` by caching jwks as strings ([#435](https://github.com/firebase/php-jwt/pull/435))

#### 6.2.0 / 2022-05-14

 - Added `CachedKeySet` ([#397](https://github.com/firebase/php-jwt/pull/397))
 - Added `$defaultAlg` parameter to `JWT::parseKey` and `JWT::parseKeySet` ([#426](https://github.com/firebase/php-jwt/pull/426)). 

#### 6.1.0 / 2022-03-23

 - Drop support for PHP 5.3, 5.4, 5.5, 5.6, and 7.0
 - Add parameter typing and return types where possible

#### 6.0.0 / 2022-01-24

 - **Backwards-Compatibility Breaking Changes**: See the [Release Notes](https://github.com/firebase/php-jwt/releases/tag/v6.0.0) for more information.
 - New Key object to prevent key/algorithm type confusion (#365)
 - Add JWK support (#273)
 - Add ES256 support (#256)
 - Add ES384 support (#324)
 - Add Ed25519 support (#343)

#### 5.0.0 / 2017-06-26
- Support RS384 and RS512.
  See [#117](https://github.com/firebase/php-jwt/pull/117). Thanks [@joostfaassen](https://github.com/joostfaassen)!
- Add an example for RS256 openssl.
  See [#125](https://github.com/firebase/php-jwt/pull/125). Thanks [@akeeman](https://github.com/akeeman)!
- Detect invalid Base64 encoding in signature.
  See [#162](https://github.com/firebase/php-jwt/pull/162). Thanks [@psignoret](https://github.com/psignoret)!
- Update `JWT::verify` to handle OpenSSL errors.
  See [#159](https://github.com/firebase/php-jwt/pull/159). Thanks [@bshaffer](https://github.com/bshaffer)!
- Add `array` type hinting to `decode` method
  See [#101](https://github.com/firebase/php-jwt/pull/101). Thanks [@hywak](https://github.com/hywak)!
- Add all JSON error types.
  See [#110](https://github.com/firebase/php-jwt/pull/110). Thanks [@gbalduzzi](https://github.com/gbalduzzi)!
- Bugfix 'kid' not in given key list.
  See [#129](https://github.com/firebase/php-jwt/pull/129). Thanks [@stampycode](https://github.com/stampycode)!
- Miscellaneous cleanup, documentation and test fixes.
  See [#107](https://github.com/firebase/php-jwt/pull/107), [#115](https://github.com/firebase/php-jwt/pull/115),
  [#160](https://github.com/firebase/php-jwt/pull/160), [#161](https://github.com/firebase/php-jwt/pull/161), and
  [#165](https://github.com/firebase/php-jwt/pull/165). Thanks [@akeeman](https://github.com/akeeman),
  [@chinedufn](https://github.com/chinedufn), and [@bshaffer](https://github.com/bshaffer)!

#### 4.0.0 / 2016-07-17
- Add support for late static binding. See [#88](https://github.com/firebase/php-jwt/pull/88) for details. Thanks to [@chappy84](https://github.com/chappy84)!
- Use static `$timestamp` instead of `time()` to improve unit testing. See [#93](https://github.com/firebase/php-jwt/pull/93) for details. Thanks to [@josephmcdermott](https://github.com/josephmcdermott)!
- Fixes to exceptions classes. See [#81](https://github.com/firebase/php-jwt/pull/81) for details. Thanks to [@Maks3w](https://github.com/Maks3w)!
- Fixes to PHPDoc. See [#76](https://github.com/firebase/php-jwt/pull/76) for details. Thanks to [@akeeman](https://github.com/akeeman)!

#### 3.0.0 / 2015-07-22
- Minimum PHP version updated from `5.2.0` to `5.3.0`.
- Add `\Firebase\JWT` namespace. See
[#59](https://github.com/firebase/php-jwt/pull/59) for details. Thanks to
[@Dashron](https://github.com/Dashron)!
- Require a non-empty key to decode and verify a JWT. See
[#60](https://github.com/firebase/php-jwt/pull/60) for details. Thanks to
[@sjones608](https://github.com/sjones608)!
- Cleaner documentation blocks in the code. See
[#62](https://github.com/firebase/php-jwt/pull/62) for details. Thanks to
[@johanderuijter](https://github.com/johanderuijter)!

#### 2.2.0 / 2015-06-22
- Add support for adding custom, optional JWT headers to `JWT::encode()`. See
[#53](https://github.com/firebase/php-jwt/pull/53/files) for details. Thanks to
[@mcocaro](https://github.com/mcocaro)!

#### 2.1.0 / 2015-05-20
- Add support for adding a leeway to `JWT:decode()` that accounts for clock skew
between signing and verifying entities. Thanks to [@lcabral](https://github.com/lcabral)!
- Add support for passing an object implementing the `ArrayAccess` interface for
`$keys` argument in `JWT::decode()`. Thanks to [@aztech-dev](https://github.com/aztech-dev)!

#### 2.0.0 / 2015-04-01
- **Note**: It is strongly recommended that you update to > v2.0.0 to address
  known security vulnerabilities in prior versions when both symmetric and
  asymmetric keys are used together.
- Update signature for `JWT::decode(...)` to require an array of supported
  algorithms to use when verifying token signatures.


Tests
-----
Run the tests using phpunit:

```bash
$ pear install PHPUnit
$ phpunit --configuration phpunit.xml.dist
PHPUnit 3.7.10 by Sebastian Bergmann.
.....
Time: 0 seconds, Memory: 2.50Mb
OK (5 tests, 5 assertions)
```

New Lines in private keys
-----

If your private key contains `\n` characters, be sure to wrap it in double quotes `""`
and not single quotes `''` in order to properly interpret the escaped characters.

License
-------
[3-Clause BSD](http://opensource.org/licenses/BSD-3-Clause).
