PHP ActiveX

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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PHP ActiveX

<?php

$success = 0;

$jwe = new COM("Chilkat.Jwe");

//  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
//  encryption algorithm (enc).
$header = new COM("Chilkat.JsonObject");
$header->UpdateString('alg','A256KW');
$header->UpdateString('enc','A256GCM');
$success = $jwe->SetProtectedHeader($header);
if ($success == 0) {
    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 == 0) {
    print $jwe->LastErrorText . "\n";
    exit;
}

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

$sbJwe = new COM("Chilkat.StringBuilder");
$success = $jwe->EncryptBd($bdContent,$sbJwe);
if ($success == 0) {
    print $jwe->LastErrorText . "\n";
    exit;
}

print $sbJwe->getAsString() . "\n";

?>