Delphi ActiveX

Sign String to create a CAdES-T Signature, using HTTP Proxy to Access Timestamp Server

This example will sign a string to create a CAdEST-T signature. It will use an HTTP proxy to access the timestamp server. 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;
crypt: TChilkatCrypt2;
cert: TChilkatCert;
attrs: TChilkatJsonObject;
strToSign: WideString;
bd: TChilkatBinData;
http: TChilkatHttp;

begin
success := 0;

crypt := TChilkatCrypt2.Create(Self);

cert := TChilkatCert.Create(Self);
cert.SmartCardPin := '123456';
success := cert.LoadFromSmartcard('');
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();

strToSign := 'Hello World!';

bd := TChilkatBinData.Create(Self);
bd.AppendString(strToSign,'utf-8');

// -------------------------------------------------------------------------
// The purpose of this example is to show how an HTTP object with custom
// settings can be used to access the Internet when signing.
// Access to the Internet is needed to communicate with the timestamp server.
http := TChilkatHttp.Create(Self);
// This can be a domain name, hostname, or IP address.
http.ProxyDomain := '172.16.16.56';
http.ProxyPort := 808;
http.ProxyLogin := 'myProxyLogin';
http.ProxyPassword := 'myProxyPassword';
crypt.SetTsaHttpObj(http.ControlInterface);
// -------------------------------------------------------------------------

// This creates the CAdES-T signature.  During the signature creation, it
// communicates with the TSA to get a timestampToken.
// The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
success := crypt.OpaqueSignBd(bd.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

// Get the signature in base64 format:
Memo1.Lines.Add(bd.GetEncoded('base64_mime'));

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