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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Perl

use chilkat();

$success = 0;

$jws = chilkat::CkJws->new();

#  Set the protected header for signer 0, specifying the signature algorithm (alg).
$header = chilkat::CkJsonObject->new();
$header->UpdateString("alg","HS256");
$success = $jws->SetProtectedHeader(0,$header);
if ($success == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

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

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

#  Create the JWS and write it into a StringBuilder.
$sbJws = chilkat::CkStringBuilder->new();
$success = $jws->CreateJwsSb($sbJws);
if ($success == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

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