Perl Requires Chilkat v11.5.0+

Create JWS Using Private Key on a Smart Card

See more JSON Web Signatures (JWS) Examples

Creates and validates a JSON Web Signature (JWS) using the private key associated with a certificate on a smart card. Perl

use chilkat();

$success = 0;

#  This requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  Load the certificate from a smart card.
$cert = chilkat::CkCert->new();

#  Set the smarcard PIN prior to loading
$cert->put_SmartCardPin("123456");

#  Detect the connected smartcard or USB security token and load the default certificate.
$success = $cert->LoadFromSmartcard("");
if ($success == 0) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

#  Note: Chilkat provides many different ways to load a certificate from a smartcard or USB token,
#  such as selecting a certificate if the card contains multiple certificates with private keys,
#  or working with lower-level PKCS11 or ScMinidriver API's (both of which Chilkat provides).

#  Create the JWS Protected Header
$jwsProtHdr = chilkat::CkJsonObject->new();

if ($cert->IsEcdsa() == 1) {
    $jwsProtHdr->AppendString("alg","ES256");
}
else {
    $jwsProtHdr->AppendString("alg","RS256");
}

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

#  Set the protected header:
$signatureIndex = 0;
$jws->SetProtectedHeader($signatureIndex,$jwsProtHdr);

#  Provide the private key via the certificate.
#  This requires Chilkat v11.5.0 or greater.
$jws->SetSigningCert($signatureIndex,$cert);

#  Set the payload.
$bIncludeBom = 0;
$payloadStr = "In our village, folks say God crumbles up the old moon into stars.";
$jws->SetPayload($payloadStr,"utf-8",$bIncludeBom);

#  Create the JWS
#  By default, the compact serialization is used.
$jwsCompact = $jws->createJws();
if ($jws->get_LastMethodSuccess() == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

print "JWS: " . $jwsCompact . "\r\n";

#  sample output:
#  JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ

#  Now load the JWS, validate, and recover the original text.
$jws2 = chilkat::CkJws->new();

#  Load the JWS.
$success = $jws2->LoadJws($jwsCompact);

$pubKey = chilkat::CkPublicKey->new();
$cert->GetPublicKey($pubKey);

#  Set the public key used for validation.
$signatureIndex = 0;
$jws2->SetPublicKey($signatureIndex,$pubKey);

#  Validate the 1st (and only) signature at index 0..
$v = $jws2->Validate($signatureIndex);
if ($v < 0) {
    #  Perhaps Chilkat was not unlocked or the trial expired..
    print "Method call failed for some other reason." . "\r\n";
    print $jws2->lastErrorText() . "\r\n";
    exit;
}

if ($v == 0) {
    print "Invalid signature.  The key was incorrect, the JWS was invalid, or both." . "\r\n";
    exit;
}

#  If we get here, the signature was validated..
print "Signature validated." . "\r\n";

#  Recover the original content:
print $jws2->getPayload("utf-8") . "\r\n";

#  Examine the protected header:

$joseHeader = chilkat::CkJsonObject->new();
$success = $jws2->GetProtectedH($signatureIndex,$joseHeader);
if ($success == 0) {
    print $jws2->lastErrorText() . "\r\n";
    exit;
}

$joseHeader->put_EmitCompact(0);

print "Protected (JOSE) header:" . "\r\n";
print $joseHeader->emit() . "\r\n";

#  Output:

#  	Signature validated.
#  	In our village, folks say God crumbles up the old moon into stars.
#  	Protected (JOSE) header:
#  	{ 
#  	  "alg": "RS256"
#  	}