PHP Requires Chilkat v11.0.0+

JWS Using HMAC SHA-256

See more JSON Web Signatures (JWS) Examples

Creates a JSON Web Signatures (JWS) using HMAC SHA-256. Chilkat2 PHP

<?php

use Chilkat2\JsonObject;
use Chilkat2\Jws;

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

// First create the JWS Protected Header
$jwsProtHdr = new JsonObject();
$jwsProtHdr->AppendString('typ', 'JWT');
$jwsProtHdr->AppendString('alg', 'HS256');
echo 'JWS Protected Header: ', $jwsProtHdr->Emit(), "\n";

// Output:
// JWS Protected Header: {"typ":"JWT","alg":"HS256"}

$jws = new Jws();

// Set the HMAC key:
$hmacKey = 'AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow';
$signatureIndex = 0;
$jws->SetMacKey($signatureIndex, $hmacKey, 'base64url');

// Set the protected header:
$jws->SetProtectedHeader($signatureIndex, $jwsProtHdr);

// Set the payload.
$bIncludeBom = false;
$payloadStr = 'In our village, folks say God crumbles up the old moon into stars.';
$jws->SetPayload($payloadStr, 'utf-8', $bIncludeBom);

// Create the JWS
// By default, the compact serialization is used.
try {
    $jwsCompact = $jws->CreateJws();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'JWS: ', $jwsCompact, "\n";

// sample output:
// JWS: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.bsYsi8HJ0N6OqGI1hKQ9QQRNPxxA5qMpcHLtOvXatk8

// Now load the JWS, validate, and recover the original text.
$jws2 = new Jws();

// Load the JWS.
$jws2->LoadJws($jwsCompact);

// Set the MAC key used for validation.
$signatureIndex = 0;
$jws2->SetMacKey($signatureIndex, $hmacKey, 'base64url');

// Validate the 1st (and only) signature at index 0..
$v = $jws2->Validate($signatureIndex);
if ($v < 0) {
    // Perhaps Chilkat was not unlocked or the trial expired..
    echo "Method call failed for some other reason.\n";
    echo $jws2->LastErrorText, "\n";
    exit;
}

if ($v == 0) {
    echo "Invalid signature.  The MAC key was incorrect, the JWS was invalid, or both.\n";
    exit;
}

// If we get here, the signature was validated..
echo "Signature validated.\n";

// Recover the original content:
echo $jws2->GetPayload('utf-8'), "\n";

// Examine the protected header:

$joseHeader = new JsonObject();
try {
    $jws2->GetProtectedH($signatureIndex, $joseHeader);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$joseHeader->EmitCompact = false;

echo "Protected (JOSE) header:\n";
echo $joseHeader->Emit(), "\n";

// Output:

//     Signature validated.
//     In our village, folks say God crumbles up the old moon into stars.
//     Protected (JOSE) header:
//     {
//       "typ": "JWT",
//       "alg": "HS256"
//     }