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(PHP Extension) PKCS11 Sign PDF using Certificate and Private Key on Smart Card / USB Token

See more PKCS11 Examples

Sample code showing how to use PKCS11 to sign a PDF with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

Chilkat PHP Downloads

PHP Extension for Windows, Linux, MacOS,
Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

// Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

$pkcs11 = new CkPkcs11();

$pkcs11->put_SharedLibPath('C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll');
$pin = '0000';
$userType = 1;

// Establish a PKCS11 logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
$success = $pkcs11->QuickSession($userType,$pin);
if ($success == false) {
    print $pkcs11->lastErrorText() . "\n";
    exit;
}

// Get the certificate (on the smart card) that has a private key.
// There are other ways to locate a certificate on the HSM.
// This example assumes there is a single certificate w/ private key.
$cert = new CkCert();
$success = $pkcs11->FindCert('privateKey','',$cert);
if ($success == true) {
    print 'Cert with private key: ' . $cert->subjectCN() . "\n";
}
else {
    print 'No certificates having a private key were found.' . "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

// --------------------------------------------------------------------------
// At this point, we have the cert to be used for signing.
// Our PDF signing code is the same as for a cert obtained from any other source..

$pdf = new CkPdf();

// Load a PDF to be signed.
$success = $pdf->LoadFile('qa_data/pdf/hello.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

$json = new CkJsonObject();

$json->UpdateInt('page',1);
$json->UpdateString('appearance.y','top');
$json->UpdateString('appearance.x','left');
$json->UpdateString('appearance.fontScale','10.0');
$json->UpdateString('signingAlgorithm','pss');
$json->UpdateString('hashAlgorithm','sha256');

$i = 0;
$json->put_I($i);
$json->UpdateString('appearance.text[i]','Digitaly signed by: Xyz Widgets, Inc.');
$i = $i + 1;
$json->put_I($i);
$json->UpdateString('appearance.text[i]','current_dt');
$i = $i + 1;
$json->put_I($i);
$json->UpdateString('appearance.text[i]','blah blah blah');

// The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
$success = $pdf->SetSigningCert($cert);

$success = $pdf->SignPdf($json,'qa_output/out.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

// --------------------------------------------------------------------------

// Revert to an unauthenticated session by calling Logout.
$success = $pkcs11->Logout();
if ($success == false) {
    print $pkcs11->lastErrorText() . "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

// When finished, close the session.
// It is important to close the session (memory leaks will occur if the session is not properly closed).
$success = $pkcs11->CloseSession();
if ($success == false) {
    print $pkcs11->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>

 

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