Perl Requires Chilkat v9.5.0.96+

Sign PDF in the Cloud using AWS CloudHSM

See more Signing in the Cloud Examples

Demonstrates how to sign a PDF using AWS CloudHSM. The signing of the hash happens on a hardware token in AWS CloudHSM. Everything else involving the updating the PDF to add the signature happens locally within Chilkat. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# 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.

my $pkcs11 = Chilkat2::Pkcs11->new;

# Provide the path to the AWS CloudHSM PKCS11 driver.
# This example runs on Windows, so we'll provide the CloudHSM DLL.
# If your code runs on Linux, the CloudHSM driver might be at /opt/cloudhsm/lib/libcloudhsm_pkcs11.so
$pkcs11->SharedLibPath('C:\Program Files\Amazon\CloudHSM\lib\cloudhsm_pkcs11.dll');

# Your PIN should be a string containing your crypto user's login and password, with a colon char delimiting.
# See https://docs.aws.amazon.com/cloudhsm/latest/userguide/pkcs11-pin.html
my $pin = 'user:password';
my $userType = 1;

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

my $cert = Chilkat2::Cert->new;
$success = $cert->LoadFromFile('qa_data/certs/myCert.cer');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

# Tell the certificate to link with the PKCS11 session.
# The cert's private key should be installed on the CloudHSM.
# If there are multiple private keys on the CloudHSM, then Chilkat will automatically
# locate and use the private key corresponding to the certificate.
$success = $cert->LinkPkcs11($pkcs11);
if (!$success) {
    print $cert->LastErrorText, "\n";
    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..

my $pdf = Chilkat2::Pdf->new;

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

my $json = Chilkat2::JsonObject->new;

$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');

my $i = 0;
$json->I($i);
$json->UpdateString('appearance.text[i]', 'Digitaly signed by: Xyz Widgets, Inc.');
$i = $i + 1;
$json->I($i);
$json->UpdateString('appearance.text[i]', 'current_dt');
$i = $i + 1;
$json->I($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) {
    print $pdf->LastErrorText, "\n";
    $success = $pkcs11->CloseSession();
    exit;
}

# --------------------------------------------------------------------------

# Revert to an unauthenticated session by calling Logout.
$success = $pkcs11->Logout();
if (!$success) {
    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) {
    print $pkcs11->LastErrorText, "\n";
    exit;
}

print "Success.\n";