Delphi ActiveX

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.

Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
cert: TChilkatCert;
jsonAwsKms: TChilkatJsonObject;
crypt: TChilkatCrypt2;
signedAttrs: TChilkatJsonObject;
inputXmlPath: WideString;
outputP7mPath: WideString;

begin
success := 0;

// 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 := TChilkatCert.Create(Self);
success := cert.LoadFromFile('qa_data/certs/myCert.cer');
if (success = 0) then
  begin
    Memo1.Lines.Add(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 := TChilkatJsonObject.Create(Self);
// 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.ControlInterface);

crypt := TChilkatCrypt2.Create(Self);

success := crypt.SetSigningCert(cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(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 := 1;

crypt.HashAlgorithm := 'sha256';

signedAttrs := TChilkatJsonObject.Create(Self);
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 = 0) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

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