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![Build Status](https://github.com/firebase/php-jwt/actions/workflows/tests.yml/badge.svg) [![Latest Stable Version](https://poser.pugx.org/firebase/php-jwt/v/stable)](https://packagist.org/packages/firebase/php-jwt) [![Total Downloads](https://poser.pugx.org/firebase/php-jwt/downloads)](https://packagist.org/packages/firebase/php-jwt) [![License](https://poser.pugx.org/firebase/php-jwt/license)](https://packagist.org/packages/firebase/php-jwt) 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 env 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); // Pass a stdClass in as the third parameter to get the decoded header values $decoded = JWT::decode($jwt, new Key($key, 'HS256'), $headers = new stdClass()); print_r($headers); /* 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 encode/decode headers ------- Decoding the JWT headers without verifying the JWT first is NOT recommended, and is not supported by this library. This is because without verifying the JWT, the header values could have been tampered with. Any value pulled from an unverified header should be treated as if it could be any string sent in from an attacker. If this is something you still want to do in your application for whatever reason, it's possible to decode the header values manually simply by calling `json_decode` and `base64_decode` on the JWT header part: ```php use Firebase\JWT\JWT; $key = 'example_key'; $payload = [ 'iss' => 'http://example.org', 'aud' => 'http://example.com', 'iat' => 1356999524, 'nbf' => 1357000000 ]; $headers = [ 'x-forwarded-for' => 'www.google.com' ]; // Encode headers in the JWT string $jwt = JWT::encode($payload, $key, 'HS256', null, $headers); // Decode headers from the JWT string WITHOUT validation // **IMPORTANT**: This operation is vulnerable to attacks, as the JWT has not yet been verified. // These headers could be any value sent by an attacker. list($headersB64, $payloadB64, $sig) = explode('.', $jwt); $decoded = json_decode(base64_decode($headersB64), true); print_r($decoded); ``` Example with RS256 (openssl) ---------------------------- ```php use Firebase\JWT\JWT; use Firebase\JWT\Key; $privateKey = << '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"; ```` Example with multiple keys -------------------------- ```php use Firebase\JWT\JWT; use Firebase\JWT\Key; // Example RSA keys from previous example // $privateKey1 = '...'; // $publicKey1 = '...'; // Example EdDSA keys from previous example // $privateKey2 = '...'; // $publicKey2 = '...'; $payload = [ 'iss' => 'example.org', 'aud' => 'example.com', 'iat' => 1356999524, 'nbf' => 1357000000 ]; $jwt1 = JWT::encode($payload, $privateKey1, 'RS256', 'kid1'); $jwt2 = JWT::encode($payload, $privateKey2, 'EdDSA', 'kid2'); echo "Encode 1:\n" . print_r($jwt1, true) . "\n"; echo "Encode 2:\n" . print_r($jwt2, true) . "\n"; $keys = [ 'kid1' => new Key($publicKey1, 'RS256'), 'kid2' => new Key($publicKey2, 'EdDSA'), ]; $decoded1 = JWT::decode($jwt1, $keys); $decoded2 = JWT::decode($jwt2, $keys); echo "Decode 1:\n" . print_r((array) $decoded1, true) . "\n"; echo "Decode 2:\n" . print_r((array) $decoded2, 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 ------------- #### Exception Handling When a call to `JWT::decode` is invalid, it will throw one of the following exceptions: ```php use Firebase\JWT\JWT; use Firebase\JWT\SignatureInvalidException; use Firebase\JWT\BeforeValidException; use Firebase\JWT\ExpiredException; use DomainException; use InvalidArgumentException; use UnexpectedValueException; try { $decoded = JWT::decode($payload, $keys); } catch (InvalidArgumentException $e) { // provided key/key-array is empty or malformed. } catch (DomainException $e) { // provided algorithm is unsupported OR // provided key is invalid OR // unknown error thrown in openSSL or libsodium OR // libsodium is required but not available. } catch (SignatureInvalidException $e) { // provided JWT signature verification failed. } catch (BeforeValidException $e) { // provided JWT is trying to be used before "nbf" claim OR // provided JWT is trying to be used before "iat" claim. } catch (ExpiredException $e) { // provided JWT is trying to be used after "exp" claim. } catch (UnexpectedValueException $e) { // provided JWT is malformed OR // provided JWT is missing an algorithm / using an unsupported algorithm OR // provided JWT algorithm does not match provided key OR // provided key ID in key/key-array is empty or invalid. } ``` All exceptions in the `Firebase\JWT` namespace extend `UnexpectedValueException`, and can be simplified like this: ```php use Firebase\JWT\JWT; use UnexpectedValueException; try { $decoded = JWT::decode($payload, $keys); } catch (LogicException $e) { // errors having to do with environmental setup or malformed JWT Keys } catch (UnexpectedValueException $e) { // errors having to do with JWT signature and claims } ``` #### 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); ``` 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).