PHP ActiveX 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. PHP ActiveX

<?php

$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 = new COM("Chilkat.Cert");

//  Set the smarcard PIN prior to loading
$cert->SmartCardPin = '123456';

//  Detect the connected smartcard or USB security token and load the default certificate.
$success = $cert->LoadFromSmartcard('');
if ($success == 0) {
    print $cert->LastErrorText . "\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 = new COM("Chilkat.JsonObject");

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

$jws = new COM("Chilkat.Jws");

//  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->LastMethodSuccess == 0) {
    print $jws->LastErrorText . "\n";
    exit;
}

print 'JWS: ' . $jwsCompact . "\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 = new COM("Chilkat.Jws");

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

$pubKey = new COM("Chilkat.PublicKey");
$cert->GetPublicKey($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.' . "\n";
    print $jws2->LastErrorText . "\n";
    exit;
}

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

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

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

//  Examine the protected header:

$joseHeader = new COM("Chilkat.JsonObject");
$success = $jws2->GetProtectedH($signatureIndex,$joseHeader);
if ($success == 0) {
    print $jws2->LastErrorText . "\n";
    exit;
}

$joseHeader->EmitCompact = 0;

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

//  Output:

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

?>