Perl

Create a JWS into a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJwsSb, which creates a JWS and writes it into a StringBuilder.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

my $jws = Chilkat2::Jws->new;

# Set the protected header for signer 0, specifying the signature algorithm (alg).
my $header = Chilkat2::JsonObject->new;
$header->UpdateString('alg', 'HS256');
my $success = $jws->SetProtectedHeader(0, $header);
if (!$success) {
    print $jws->LastErrorText, "\n";
    exit;
}

# Set the payload to be signed.
my $bIncludeBom = 0;
$success = $jws->SetPayload('This is the content to sign.', 'utf-8', $bIncludeBom);
if (!$success) {
    print $jws->LastErrorText, "\n";
    exit;
}

# Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
# rather than hard-coding it.
my $base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
$success = $jws->SetMacKey(0, $base64Key, 'base64');
if (!$success) {
    print $jws->LastErrorText, "\n";
    exit;
}

# Create the JWS and write it into a StringBuilder.
my $sbJws = Chilkat2::StringBuilder->new;
$success = $jws->CreateJwsSb($sbJws);
if (!$success) {
    print $jws->LastErrorText, "\n";
    exit;
}

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