Pascal (Lazarus/Delphi)

Create CAdES p7m using AWS KMS to Sign in the Cloud

See more Signing in the Cloud Examples

Demonstrates how to create a CAdES p7m, using AWS KMS. The signing of the hash happens in the Cloud on AWS KMS. Everything else regarding the creation of CAdES happens locally within Chilkat.

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

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Cert,
  Chilkat.JsonObject,
  Chilkat.Crypt2;

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

procedure RunDemo;
var
  success: Boolean;
  cert: TCert;
  jsonAwsKms: TJsonObject;
  crypt: TCrypt2;
  signedAttrs: TJsonObject;
  inputXmlPath: string;
  outputP7mPath: string;

begin
  success := False;

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

  //  Load the certificate used for signing.  The certificate's private key is stored in AWS KMS
  //  However, we still need the certificate locally (without private key).
  cert := TCert.Create;
  success := cert.LoadFromFile('qa_data/certs/myCert.cer');
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  //  Here's a screenshot showing the key ID of a private key in AWS KMS:
  //  (image:https://example-code.com/images/aws_kms.jpg/endImage)

  //  To sign using AWS KMS, 
  //  add the following lines of code to specify your AWS authentication credentials,
  //  and the ID of the KMS private key.
  jsonAwsKms := TJsonObject.Create;
  //  Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
  jsonAwsKms.UpdateString('service','aws_kms');
  jsonAwsKms.UpdateString('access_key','ACCESS_KEY');
  jsonAwsKms.UpdateString('secret_key','SECRET_KEY');
  //  Make sure to specify the correct region for your case.
  jsonAwsKms.UpdateString('region','us-west-2');
  //  In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
  jsonAwsKms.UpdateString('key_id','187012e8-008f-4fc7-b100-5efe6146dff2');

  success := cert.SetCloudSigner(jsonAwsKms);

  crypt := TCrypt2.Create;

  success := crypt.SetSigningCert(cert);
  if (success = False) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  //  The CadesEnabled property applies to all methods that create PKCS7 signatures. 
  //  To create a CAdES-BES signature, set this property equal to true.
  crypt.CadesEnabled := True;

  crypt.HashAlgorithm := 'sha256';

  signedAttrs := TJsonObject.Create;
  signedAttrs.UpdateInt('contentType',1);
  signedAttrs.UpdateInt('signingTime',1);
  signedAttrs.UpdateInt('messageDigest',1);
  signedAttrs.UpdateInt('signingCertificateV2',1);
  crypt.SigningAttributes := signedAttrs.Emit();

  //  You can sign any type of file..
  inputXmlPath := 'qa_data/e-Invoice.xml';
  outputP7mPath := 'qa_output/signed.p7m';

  //  Create the CAdES-BES attached signature, which contains the original data.
  //  Chilkat will build the .p7m locally, but will (internally) use ARSS
  //  to do the RSA signing remotely.
  success := crypt.CreateP7M(inputXmlPath,outputP7mPath);
  if (success = False) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');


  cert.Free;
  jsonAwsKms.Free;
  crypt.Free;
  signedAttrs.Free;

end;

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

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.