PHP Extension

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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PHP Extension

<?php

include("chilkat.php");

$success = false;

$jwe = new CkJwe();

//  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
//  encryption algorithm (enc).
$header = new CkJsonObject();
$header->UpdateString('alg','A256KW');
$header->UpdateString('enc','A256GCM');
$success = $jwe->SetProtectedHeader($header);
if ($success == false) {
    print $jwe->lastErrorText() . "\n";
    exit;
}

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

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

print $jweCompact . "\n";

?>