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

include("chilkat.php");

$success = false;

$jwe = new CkJwe();

//  Protected header: AES key-wrap with AES-256-GCM content encryption.
$header = new CkJsonObject();
$header->UpdateString('alg','A256KW');
$header->UpdateString('enc','A256GCM');
$success = $jwe->SetProtectedHeader($header);
if ($success == false) {
    print $jwe->lastErrorText() . "\n";
    exit;
}

//  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=';
$success = $jwe->SetWrappingKey(0,$base64Key,'base64');
if ($success == false) {
    print $jwe->lastErrorText() . "\n";
    exit;
}

$jweCompact = $jwe->encrypt('This is the secret content.','utf-8');
if ($jwe->get_LastMethodSuccess() == false) {
    print $jwe->lastErrorText() . "\n";
    exit;
}

print $jweCompact . "\n";

?>