Lazarus Pascal

Example: Crypt2.GetSignedAttributes method

Demonstrates how to call the GetSignedAttributes method. Lazarus Pascal

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.BinData,
  Chilkat.StringBuilder,
  Chilkat.JsonObject,
  Chilkat.Crypt2;

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

procedure RunDemo;
var
  success: Boolean;
  crypt: TCrypt2;
  bdPkcs7: TBinData;
  json: TJsonObject;
  sbJson: TStringBuilder;
  i: Integer;
  tryNext: Boolean;

begin
  success := False;

  crypt := TCrypt2.Create;

  bdPkcs7 := TBinData.Create;
  success := bdPkcs7.LoadFile('qa_data/cades/CAdES-T/Signature-C-T-1.p7m');
  if (success = False) then
    begin
      WriteLn(bdPkcs7.LastErrorText);
      Exit;
    end;

  json := TJsonObject.Create;
  json.EmitCompact := False;

  sbJson := TStringBuilder.Create;
  i := 0;
  tryNext := True;
  while tryNext do
    begin
      if (crypt.GetSignedAttributes(i,bdPkcs7,sbJson) = True) then
        begin
          json.LoadSb(sbJson);
          WriteLn(i + ': ');
          WriteLn(json.Emit());
        end
      else
        begin
          tryNext := False;
        end;

      i := i + 1;
    end;

  //  Sample output:

  //  0: 
  //  {
  //    "signedAttributes": [
  //      {
  //        "oid": "1.2.840.113549.1.9.3",
  //        "name": "Content Type"
  //      },
  //      {
  //        "oid": "1.2.840.113549.1.9.5",
  //        "name": "Signing Time"
  //      },
  //      {
  //        "oid": "1.2.840.113549.1.9.4",
  //        "name": "Message Digest"
  //      },
  //      {
  //        "oid": "1.2.840.113549.1.9.16.2.47",
  //        "name": "Signing Certificate V2"
  //      }
  //    ]
  //  }


  crypt.Free;
  bdPkcs7.Free;
  json.Free;
  sbJson.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.