(Delphi DLL) 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 for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Pkcs11, Pdf, Cert, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
pkcs11: HCkPkcs11;
pin: PWideChar;
userType: Integer;
success: Boolean;
cert: HCkCert;
pdf: HCkPdf;
json: HCkJsonObject;
i: Integer;

begin
// 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 := CkPkcs11_Create();

// 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
CkPkcs11_putSharedLibPath(pkcs11,'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 := CkPkcs11_QuickSession(pkcs11,userType,pin);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    Exit;
  end;

cert := CkCert_Create();
success := CkCert_LoadFromFile(cert,'qa_data/certs/myCert.cer');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

// 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 := CkCert_LinkPkcs11(cert,pkcs11);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

// --------------------------------------------------------------------------
// 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 := CkPdf_Create();

// Load a PDF to be signed.
success := CkPdf_LoadFile(pdf,'qa_data/pdf/hello.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    success := CkPkcs11_CloseSession(pkcs11);
    Exit;
  end;

json := CkJsonObject_Create();

CkJsonObject_UpdateInt(json,'page',1);
CkJsonObject_UpdateString(json,'appearance.y','top');
CkJsonObject_UpdateString(json,'appearance.x','left');
CkJsonObject_UpdateString(json,'appearance.fontScale','10.0');
CkJsonObject_UpdateString(json,'signingAlgorithm','pss');
CkJsonObject_UpdateString(json,'hashAlgorithm','sha256');

i := 0;
CkJsonObject_putI(json,i);
CkJsonObject_UpdateString(json,'appearance.text[i]','Digitaly signed by: Xyz Widgets, Inc.');
i := i + 1;
CkJsonObject_putI(json,i);
CkJsonObject_UpdateString(json,'appearance.text[i]','current_dt');
i := i + 1;
CkJsonObject_putI(json,i);
CkJsonObject_UpdateString(json,'appearance.text[i]','blah blah blah');

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

success := CkPdf_SignPdf(pdf,json,'qa_output/out.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    success := CkPkcs11_CloseSession(pkcs11);
    Exit;
  end;

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

// Revert to an unauthenticated session by calling Logout.
success := CkPkcs11_Logout(pkcs11);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    success := CkPkcs11_CloseSession(pkcs11);
    Exit;
  end;

// When finished, close the session.
// It is important to close the session (memory leaks will occur if the session is not properly closed).
success := CkPkcs11_CloseSession(pkcs11);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    Exit;
  end;

Memo1.Lines.Add('Success.');

CkPkcs11_Dispose(pkcs11);
CkCert_Dispose(cert);
CkPdf_Dispose(pdf);
CkJsonObject_Dispose(json);

end;