(PHP Extension) Verify JWT with EdDSA / Ed25519 Signature

Note: This example requires Chilkat v9.5.0.84 or greater.

Demonstrates how to verify a JWT that was signed using an Ed25519 private key.

This example verifies the EdDSA signature. It also does the following:

• Checks to see if the time constraints ("nbf" and "exp") are valid.
• Recovers the original JOSE header.
• Recovers the original data.

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<?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");

// Demonstrates how to verify a JWT with an EdDSA/Ed25519 Signature
// *** Requires Chilkat v9.5.0.84 or greater.

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Use this Ed25519 public key for verification

$jsonPubKey = '{\'kty\': \'OKP\',\'alg\': \'EdDSA\',\'crv\': \'Ed25519\',\'x\': \'11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo\'}';

$pubKey = new CkPublicKey();
$success = $pubKey->LoadFromString($jsonPubKey);
if ($success == false) {
    print $pubKey->lastErrorText() . "\n";
    exit;
}

$jwt = new CkJwt();
$token = 'eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg';

// First verify the signature.
$sigVerified = $jwt->VerifyJwtPk($token,$pubKey);
print 'verified: ' . $sigVerified . "\n";

if ($sigVerified == false) {
    print $jwt->lastErrorText() . "\n";
    exit;
}

// Let's see if the time constraints, if any, are valid.
// The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
// If the current system time is before the "nbf" time, or after the "exp" time,
// then IsTimeValid will return false/0.
// Also, we'll allow a leeway of 60 seconds to account for any clock skew.
// Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
$leeway = 60;
$bTimeValid = $jwt->IsTimeValid($token,$leeway);
print 'time constraints valid: ' . $bTimeValid . "\n";

// Recover the original data (the payload).
$payload = $jwt->getPayload($token);
print $payload . "\n";

// Recover the original JOSE header in the same way:
$joseHeader = $jwt->getHeader($token);
print $joseHeader . "\n";

?>