PHP

Create a JWS into a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJwsSb, which creates a JWS and writes it into a StringBuilder.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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<?php

use Chilkat2\JsonObject;
use Chilkat2\Jws;
use Chilkat2\StringBuilder;

$jws = new Jws();

// Set the protected header for signer 0, specifying the signature algorithm (alg).
$header = new JsonObject();
$header->UpdateString('alg', 'HS256');
try {
    $jws->SetProtectedHeader(0, $header);

    // Set the payload to be signed.
    $bIncludeBom = false;
    $jws->SetPayload('This is the content to sign.', 'utf-8', $bIncludeBom);

    // Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
    // rather than hard-coding it.
    $base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
    $jws->SetMacKey(0, $base64Key, 'base64');

    // Create the JWS and write it into a StringBuilder.
    $sbJws = new StringBuilder();
    $jws->CreateJwsSb($sbJws);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $sbJws->GetAsString(), "\n";