PHP Extension

Create a JWS

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJws, which creates and returns a JWS from the current payload, headers, and signing key.

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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<?php

include("chilkat.php");

$success = false;

$jws = new CkJws();

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

//  Set the payload to be signed.
$bIncludeBom = false;
$success = $jws->SetPayload('This is the content to sign.','utf-8',$bIncludeBom);
if ($success == false) {
    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.
$base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
$success = $jws->SetMacKey(0,$base64Key,'base64');
if ($success == false) {
    print $jws->lastErrorText() . "\n";
    exit;
}

//  Create the JWS from the current payload, headers, and signing key.  The returned string is the
//  JWS (compact serialization by default).
$jwsCompact = $jws->createJws();
if ($jws->get_LastMethodSuccess() == false) {
    print $jws->lastErrorText() . "\n";
    exit;
}

print $jwsCompact . "\n";

?>