Encrypt a JWE with a Symmetric Wrapping Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetWrappingKey, which sets the symmetric key-wrapping key for a recipient. The key bytes are supplied in a named encoding such as hex or base64.

<?php

use Chilkat2\JsonObject;
use Chilkat2\Jwe;

$jwe = new Jwe();

// Protected header: AES key-wrap with AES-256-GCM content encryption.
$header = new JsonObject();
$header->UpdateString('alg', 'A256KW');
$header->UpdateString('enc', 'A256GCM');
try {
    $jwe->SetProtectedHeader($header);

    // Set the symmetric key-wrapping key for recipient 0.  The key bytes are provided in the named
    // encoding (here base64).  In production, obtain the key from a secure source rather than hard-coding
    // it.
    $base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
    $jwe->SetWrappingKey(0, $base64Key, 'base64');

    $jweCompact = $jwe->Encrypt('This is the secret content.', 'utf-8');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $jweCompact, "\n";