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(PHP Extension) Validate JWS Using HMAC SHA-256Validates a JSON Web Signature (JWS) using HMAC SHA-256. Note: This example requires Chilkat v9.5.0.66 or greater.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Note: This example requires Chilkat v9.5.0.66 or greater. // This example takes a JSON signature in compact serialization format, // and uses a MAC key to validate and recover the protected header and payload. $jws = new CkJws(); // Set the HMAC key: $hmacKey = 'AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow'; $signatureIndex = 0; $jws->SetMacKey($signatureIndex,$hmacKey,'base64url'); // Load the JWS. $jwsCompact = 'eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk'; $success = $jws->LoadJws($jwsCompact); // Validate the 1st (and only) signature at index 0.. $v = $jws->Validate($signatureIndex); if ($v < 0) { // Perhaps Chilkat was not unlocked or the trial expired.. print 'Method call failed for some other reason.' . "\n"; print $jws->lastErrorText() . "\n"; exit; } if ($v == 0) { print 'Invalid signature. The MAC key was incorrect, the JWS was invalid, or both.' . "\n"; exit; } // If we get here, the signature was validated.. print 'Signature validated.' . "\n"; // Recover the original content: print 'Recovered content:' . "\n"; print $jws->getPayload('utf-8') . "\n"; // Examine the protected header: // joseHeader is a CkJsonObject $joseHeader = $jws->GetProtectedHeader($signatureIndex); if ($jws->get_LastMethodSuccess() != true) { print 'No protected header found at the given index.' . "\n"; exit; } $joseHeader->put_EmitCompact(false); print 'Protected (JOSE) header:' . "\n"; print $joseHeader->emit() . "\n"; // Output: // Signature validated. // Recovered content: // {"iss":"joe", // "exp":1300819380, // "http://example.com/is_root":true} // Protected (JOSE) header: // { // "typ": "JWT", // "alg": "HS256" // } ?> |
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