Lazarus Pascal Requires Chilkat v10.1.2+

Sign a File to Create a .p7s (Detached Signature)

See more Encryption Examples

_LANGUAGE_ example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename. 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.JsonObject,
  Chilkat.Cert,
  Chilkat.CertStore,
  Chilkat.Crypt2;

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

procedure RunDemo;
var
  success: Boolean;
  crypt: TCrypt2;
  signingCertSubject: string;
  pfxFilename: string;
  pfxPassword: string;
  certStore: TCertStore;
  jsonCN: TJsonObject;
  cert: TCert;
  inFile: string;
  sigFile: string;

begin
  success := False;

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

  crypt := TCrypt2.Create;

  //  Use a digital certificate and private key from a PFX file (.pfx or .p12).
  signingCertSubject := 'Acme Inc';
  pfxFilename := '/Users/chilkat/testData/pfx/acme.pfx';
  pfxPassword := 'test123';

  certStore := TCertStore.Create;
  success := certStore.LoadPfxFile(pfxFilename,pfxPassword);
  if (success <> True) then
    begin
      WriteLn(certStore.LastErrorText);
      Exit;
    end;

  jsonCN := TJsonObject.Create;
  jsonCN.UpdateString('CN',signingCertSubject);

  cert := TCert.Create;
  success := certStore.FindCert(jsonCN,cert);
  if (success = False) then
    begin
      WriteLn('Failed to find certificate by subject common name.');
      Exit;
    end;

  //  Tell the crypt component to use this cert.
  success := crypt.SetSigningCert(cert);

  //  We can sign any type of file, creating a .p7s as output:
  inFile := '/Users/chilkat/testData/pdf/sample.pdf';
  sigFile := '/Users/chilkat/testData/p7s/sample.p7s';

  success := crypt.CreateP7S(inFile,sigFile);
  if (success = False) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  success := crypt.VerifyP7S(inFile,sigFile);
  if (success = False) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  WriteLn('Success!');


  crypt.Free;
  certStore.Free;
  jsonCN.Free;
  cert.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.