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(PHP Extension) Verify a Google JWT Using Google's Public KeySee more Google APIs ExamplesDemonstrates how to verify a JWT that was signed using Google's RSA private key. This example verifies the RSA signature. It also does the following:
<?php include("chilkat_9_5_0.php"); // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $http = new CkHttp(); $sbPubKeys = new CkStringBuilder(); $success = $http->QuickGetSb('https://www.googleapis.com/oauth2/v3/certs',$sbPubKeys); if ($success == false) { print $http->lastErrorText() . "\n"; exit; } print $sbPubKeys->getAsString() . "\n"; // Here are the keys: // { // "keys": [ // { // "e": "AQAB", // "n": "4bAT6C6EeX8Dspje3FrAXw-nnhNk04e1RmNa4kjc0CHf6Pk7ryARlwA-6YilyPABqQfYHx60s8oSnxvUVprFfQ2-Q8aAZO7bPKSxnoGlcKERL2oLNA4Msvc89N9Y5ycThZUplf_QC19e6jyYXN6Nz-UnJSCLrtQY8tVhhVRs61j4A2N_p-enAi-r704Qi1-v-DKV4eVRkClKViploo8NyjUaT9L4vbBssPCjyimJzsWnEe1fED5c4LnHeArYzA_FEn3JJotqDIz9t2VnvZNTMhizHEX4VnORlEWMEfR8n4CEHQx7PcQUOmfqyw08gWeXQl1-uTjtIGaE-sRIv9u_vQ", // "kty": "RSA", // "use": "sig", // "alg": "RS256", // "kid": "2af90e87be140c20038898a6efa11283dab6031d" // }, // { // "n": "nzGsrziOYrMVYMpvUZOwkKNiPWcOPTYRYlDSdRW4UpAHdWPbPlyqaaphYhoMB5DXrVxI3bdvm7DOlo-sHNnulmAFQa-7TsQMxrZCvVdAbyXGID9DZYEqf8mkCV1Ohv7WY5lDUqlybIk1OSHdK7-1et0QS8nn-5LojGg8FK4ssLf3mV1APpujl27D1bDhyRb1MGumXYElwlUms7F9p9OcSp5pTevXCLmXs9MJJk4o9E1zzPpQ9Ko0lH9l_UqFpA7vwQhnw0nbh73rXOX2TUDCUqL4ThKU5Z9Pd-eZCEOatKe0mJTpQ00XGACBME_6ojCdfNIJr84Y_IpGKvkAEksn9w", // "use": "sig", // "kid": "87bbe0815b064e6d449cac999f0e50e72a3e4374", // "e": "AQAB", // "alg": "RS256", // "kty": "RSA" // } // ] // } // ------------------------------------------------------------------------------------------- // Replace this with your actual token. // This sample token contains a kid that does not match any of the above Google public keys. // ------------------------------------------------------------------------------------------- $token = 'eyJhbGciOiJSUzI1NiIsImtpZCI6IjQyZmY5MGQ3ZDM0OGM5NzM4MWE3YzExOWVmMWY1MzI0ZWEzZjViZWIifQ.eyJpc3MiOiJodHRwczovL2FjY291bnRzLmdvb2dsZS5jb20iLCJzdWIiOiIxMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExIiwiaWF0IjoxNjExMTE1MTQzLCJleHAiOjE2MTEyMDE1NDMsImF1ZCI6IjQyOTc1NzExNTE0ODg0OSJ9.pLem5i0bx3M7lJYj7jKv2Nq7c07X5YpZz-x1uM5RniW-v4LsX-lKIVvOq2x3-WoPqkzLXJfP0kG0dx1uD2q1NfFQK60YwKH4FnFtB6INnUP1dRVpP9_pTTKyAE28I3s5Tay4PbPdrCl7ZLCIJzCfpCW1TiWeVoPjp5HgZKTBHdP_sEkN_yO5dQerQXAkFJkV3kNgF9jI3ayT-KPqOIH6GVoWXjHFDyA2EYgJPEFRo5WSe6XycJ85p5duwT-OoBcb_kJZG9PxYd91eHlPCzp8vGxzIb2dVROCBxyM8e8W0cd9v15hfmpg9R-eG9vCM5y63ZLChZLFeHFx0Pd7hvAqfKg'; $jwt = new CkJwt(); $header = $jwt->getHeader($token); print $header . "\n"; // Sample header: // {"alg":"RS256","kid":"87bbe0815b064e6d449cac999f0e50e72a3e4374"} // Load the public key matching the "kid" into a Chilkat public key object, then verify.. $json = new CkJsonObject(); $json->Load($header); $kid = $json->stringOf('kid'); print 'kid = ' . $kid . "\n"; $jsonPubKeys = new CkJsonObject(); $jsonPubKeys->LoadSb($sbPubKeys); // jsonKey is a CkJsonObject $jsonKey = $jsonPubKeys->FindRecord('keys','kid',$kid,true); if ($jsonPubKeys->get_LastMethodSuccess() == false) { print 'Did not find a matching public key based on the kid.' . "\n"; exit; } print $jsonKey->emit() . "\n"; // Load the matching public key into a Chilkat public key object. $pubKey = new CkPublicKey(); $success = $pubKey->LoadFromString($jsonKey->emit()); if ($success == false) { print $pubKey->lastErrorText() . "\n"; exit; } // ---------------------------------------------------------------------------------------- // Now we can validate the JWT using Google's public key as shown in this example: // (Except we use the public key obtained as shown above instead of a public key loaded from a PEM file. // // See Verify JWT Using an RSA Public Key ?> |
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