PHP

Verify JWT with EdDSA / Ed25519 Signature

See more JSON Web Token (JWT) Examples

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.

Chilkat2 PHP

<?php

use Chilkat2\Jwt;
use Chilkat2\PublicKey;

// 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 PublicKey();
try {
    $pubKey->LoadFromString($jsonPubKey);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

// First verify the signature.
try {
    $jwt->VerifyJwtPk($token, $pubKey);
    $sigVerified = true;
} catch (\Chilkat2\Exception $e) {
    $sigVerified = false;
}
echo 'verified: ', ($sigVerified ? 'true' : 'false'), "\n";

if (!$sigVerified) {
    echo $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, $leeway);
echo 'time constraints valid: ', ($bTimeValid ? 'true' : 'false'), "\n";

// Recover the original data (the payload).
$payload = $jwt->GetPayload($token);
echo $payload, "\n";

// Recover the original JOSE header in the same way:
$joseHeader = $jwt->GetHeader($token);
echo $joseHeader, "\n";