PHP

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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Chilkat2 PHP

<?php

use Chilkat2\BinData;
use Chilkat2\JsonObject;
use Chilkat2\Jwe;
use Chilkat2\StringBuilder;

$jwe = new Jwe();

// Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
// encryption algorithm (enc).
$header = new JsonObject();
$header->UpdateString('alg', 'A256KW');
$header->UpdateString('enc', 'A256GCM');
try {
    $jwe->SetProtectedHeader($header);

    // The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
    // from a secure source rather than hard-coding it.
    $base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
    $jwe->SetWrappingKey(0, $base64Key, 'base64');

    // Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
    $bdContent = new BinData();
    $bdContent->AppendString('Binary content to encrypt.', 'utf-8');

    $sbJwe = new StringBuilder();
    $jwe->EncryptBd($bdContent, $sbJwe);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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