在PHP中使用RSA公钥验证JWT签名

Question

在PHP中，我试图使用AWS的RSA公钥（我在https://cognito-identity.amazonaws.com/.well-known/jwks_uri). 密钥以适当的页眉/页脚开始，然后开始RSA公钥等等。我查看了一些PHP库，如Emarref\Jwt\Jwt\code>，但是我发现了错误：错误：0906D06C:PEM例程：PEM\u read\u bio:no start line。这一切归结为基本的php函数：openssl\u verify。

我已经研究了php。net/manual进行openssl验证，但我仍然不清楚参数的详细信息。所需的算法是RS512。

我能够使用node.js没有问题地验证JWT令牌（相同的密钥和令牌）。为此，我使用了库：https://github.com/auth0/node-jsonwebtoken

不知道为什么这在PHP中不起作用。我可以不使用RSA公钥吗？

function verifyKey($public_key) {
  $jwt = new Emarref\Jwt\Jwt();

  $algorithm = new Emarref\Jwt\Algorithm\Rs512();
  $factory = new Emarref\Jwt\Encryption\Factory();
  $encryption = $factory->create($algorithm);
  $encryption->setPublicKey($public_key);
  $context = new Emarref\Jwt\Verification\Context($encryption);
  $token = $jwt->deserialize($authToken);

  try {
    $jwt->verify($token, $context);
  } catch (Emarref\Jwt\Exception\VerificationException $e) {
    debug($e->getMessage());
  }
}

Answer 1

我能让这座图书馆运转起来。但是，我必须使用KeyFactory：：createFromValues而不是KeyFactory：：createFromPEM构建键。谢谢您！

Answer 2

能否尝试使用其他PHP库：https://github.com/Spomky-Labs/jose

// File test.php
require_once __DIR__.'/vendor/autoload.php';

use Jose\Checker\ExpirationChecker;
use Jose\Checker\IssuedAtChecker;
use Jose\Checker\NotBeforeChecker;
use Jose\Factory\KeyFactory;
use Jose\Factory\LoaderFactory;
use Jose\Factory\VerifierFactory;
use Jose\Object\JWKSet;
use Jose\Object\JWSInterface;

// We create a JWT loader.
$loader = LoaderFactory::createLoader();

// We load the input
$jwt = $loader->load($input);

if (!$jws instanceof JWSInterface) {
    die('Not a JWS');
}

// Please note that at this moment the signature and the claims are not verified

// To verify a JWS, we need a JWKSet that contains public keys (from RSA key in your case).
// We create our key object (JWK) using a RSA public key
$jwk = KeyFactory::createFromPEM('-----BEGIN RSA PUBLIC KEY-----...');

// Then we set this key in a keyset (JWKSet object)
// Be careful, the JWKSet object is immutable. When you add a key, you get a new JWKSet object.
$jwkset = new JWKSet();
$jwkset = $jwkset->addKey($jwk);


// We create our verifier object with a list of authorized signature algorithms (only 'RS512' in this example)
// We add some checkers. These checkers will verify claims or headers.
$verifier = VerifierFactory::createVerifier(
    ['RS512'],
    [
        new IssuedAtChecker(),
        new NotBeforeChecker(),
        new ExpirationChecker(),
    ]
);

$is_valid = $verifier->verify($jws, $jwkset);

// The variable $is_valid contains a boolean that indicates the signature is valid or not.
// If a claim is not verified (e.g. the JWT expired), an exception is thrown.

//Now you can use the $jws object to retreive all claims or header key/value pairs