(Perl) 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.

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

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# 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 = chilkat::CkPkcs11->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->put_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
$pin = "user:password";
$userType = 1;

# Establish a PKCS logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
$success = $pkcs11->QuickSession($userType,$pin);
if ($success == 0) {
    print $pkcs11->lastErrorText() . "\r\n";
    exit;
}

$cert = chilkat::CkCert->new();
$success = $cert->LoadFromFile("qa_data/certs/myCert.cer");
if ($success == 0) {
    print $cert->lastErrorText() . "\r\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 == 0) {
    print $cert->lastErrorText() . "\r\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..

$pdf = chilkat::CkPdf->new();

# Load a PDF to be signed.
$success = $pdf->LoadFile("qa_data/pdf/hello.pdf");
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    $success = $pkcs11->CloseSession();
    exit;
}

$json = chilkat::CkJsonObject->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");

$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 == 0) {
    print $pdf->lastErrorText() . "\r\n";
    $success = $pkcs11->CloseSession();
    exit;
}

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

# Revert to an unauthenticated session by calling Logout.
$success = $pkcs11->Logout();
if ($success == 0) {
    print $pkcs11->lastErrorText() . "\r\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 == 0) {
    print $pkcs11->lastErrorText() . "\r\n";
    exit;
}

print "Success." . "\r\n";