(Delphi DLL) Create CAdES p7m using AWS KMS to Sign in the Cloud

See more Signing in the Cloud Examples

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, Cert, JsonObject, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
cert: HCkCert;
success: Boolean;
jsonAwsKms: HCkJsonObject;
crypt: HCkCrypt2;
signedAttrs: HCkJsonObject;
inputXmlPath: PWideChar;
outputP7mPath: PWideChar;

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

// Here's a screenshot showing the key ID of a private key in AWS KMS:


// 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 := CkJsonObject_Create();
// Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
CkJsonObject_UpdateString(jsonAwsKms,'service','aws_kms');
CkJsonObject_UpdateString(jsonAwsKms,'access_key','ACCESS_KEY');
CkJsonObject_UpdateString(jsonAwsKms,'secret_key','SECRET_KEY');
// Make sure to specify the correct region for your case.
CkJsonObject_UpdateString(jsonAwsKms,'region','us-west-2');
// In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
CkJsonObject_UpdateString(jsonAwsKms,'key_id','187012e8-008f-4fc7-b100-5efe6146dff2');

success := CkCert_SetCloudSigner(cert,jsonAwsKms);

crypt := CkCrypt2_Create();

success := CkCrypt2_SetSigningCert(crypt,cert);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    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.
CkCrypt2_putCadesEnabled(crypt,True);

CkCrypt2_putHashAlgorithm(crypt,'sha256');

signedAttrs := CkJsonObject_Create();
CkJsonObject_UpdateInt(signedAttrs,'contentType',1);
CkJsonObject_UpdateInt(signedAttrs,'signingTime',1);
CkJsonObject_UpdateInt(signedAttrs,'messageDigest',1);
CkJsonObject_UpdateInt(signedAttrs,'signingCertificateV2',1);
CkCrypt2_putSigningAttributes(crypt,CkJsonObject__emit(signedAttrs));

// 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 := CkCrypt2_CreateP7M(crypt,inputXmlPath,outputP7mPath);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

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

CkCert_Dispose(cert);
CkJsonObject_Dispose(jsonAwsKms);
CkCrypt2_Dispose(crypt);
CkJsonObject_Dispose(signedAttrs);

end;