PHP

Encrypt Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.Encrypt, which encrypts a string and returns the resulting JWE. The charset argument converts the text to bytes before encryption.

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\JsonObject;
use Chilkat2\Jwe;

$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 the content.  The 2nd argument is the charset used to convert the text to bytes.  The
    // returned string is the JWE (compact serialization by default).
    $jweCompact = $jwe->Encrypt('This is the secret content.', 'utf-8');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $jweCompact, "\n";