(Delphi ActiveX) Create a CAdES-T Signature

Demonstrates how to create a signature with an external timestamp that certifies the time of signing. This requires an online TSA (Time Stamping Authority) service that is capable of producing RFC 3161 compliant timestamps.

Note: This example requires Chilkat v9.5.0.78 or greater.

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

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
crypt: TChilkatCrypt2;
cert: TChilkatCert;
pfxPath: WideString;
pfxPassword: WideString;
success: Integer;
attrs: TChilkatJsonObject;
inFile: WideString;
outFile: WideString;

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

crypt := TChilkatCrypt2.Create(Self);

// This example will use a certificate + private key from a .pfx/.p12 file.
// On Windows systems, it is also possible to use certs on smartcards/usb tokens or certs pre-installed in the Windows registry.
cert := TChilkatCert.Create(Self);

pfxPath := 'qa_data/pfx/myCertAndKey.p12';
pfxPassword := 'test123';

success := cert.LoadPfxFile(pfxPath,pfxPassword);
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

success := crypt.SetSigningCert(cert.ControlInterface);

// Use SHA-256 rather than the default of SHA-1
crypt.HashAlgorithm := 'sha256';

// Create JSON that tells Chilkat what signing attributes to include:
attrs := TChilkatJsonObject.Create(Self);
attrs.UpdateBool('contentType',1);
attrs.UpdateBool('signingTime',1);
attrs.UpdateBool('messageDigest',1);
attrs.UpdateBool('signingCertificateV2',1);

// A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
// We must include the TSA's URL, as well as a few options to indicate what is desired.
// Except for the TSA URL, the options shown here are typically what you would need.
attrs.UpdateBool('timestampToken.enabled',1);
attrs.UpdateString('timestampToken.tsaUrl','https://freetsa.org/tsr');
attrs.UpdateBool('timestampToken.addNonce',0);
attrs.UpdateBool('timestampToken.requestTsaCert',1);
attrs.UpdateString('timestampToken.hashAlg','sha256');

crypt.SigningAttributes := attrs.Emit();

inFile := 'qa_data/json/sample.json';
outFile := 'qa_output/sample_cades_t.p7m';

// This creates the CAdES-T signature.  During the signature creation, it
// communicates with the TSA to get a timestampToken.
success := crypt.CreateP7M(inFile,outFile);
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

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