Set JWE Additional Authenticated Data

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetAad, which sets external Additional Authenticated Data (AAD) for a JWE being encrypted, encoding the supplied text with the given charset.

use strict;
use warnings;
use Chilkat2;

my $jwe = Chilkat2::Jwe->new;

# Protected header: AES key-wrap with AES-256-GCM content encryption.
my $header = Chilkat2::JsonObject->new;
$header->UpdateString('alg', 'A256KW');
$header->UpdateString('enc', 'A256GCM');
my $success = $jwe->SetProtectedHeader($header);
if (!$success) {
    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.
my $base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
$success = $jwe->SetWrappingKey(0, $base64Key, 'base64');
if (!$success) {
    print $jwe->LastErrorText, "\n";
    exit;
}

# Set external Additional Authenticated Data (AAD).  The AAD is integrity-protected but not
# encrypted, and must be supplied again when decrypting.
$success = $jwe->SetAad('context-info-v1', 'utf-8');
if (!$success) {
    print $jwe->LastErrorText, "\n";
    exit;
}

my $sbContent = Chilkat2::StringBuilder->new;
$sbContent->Append('This is the secret content.');
my $sbJwe = Chilkat2::StringBuilder->new;
$success = $jwe->EncryptSb($sbContent, 'utf-8', $sbJwe);
if (!$success) {
    print $jwe->LastErrorText, "\n";
    exit;
}

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