Set the JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetProtectedHeader, which sets the integrity-protected header for a signer from a JsonObject. The header specifies the signature algorithm (alg).

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.Jws,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  jws: TJws;
  header: TJsonObject;

begin
  success := False;

  jws := TJws.Create;

  //  Build the JWS protected header.  The "alg" member names the signature algorithm.
  header := TJsonObject.Create;
  header.UpdateString('alg','HS256');

  //  Set the protected header for signer index 0.  The protected header is integrity-protected: it is
  //  covered by the signature.
  success := jws.SetProtectedHeader(0,header);
  if (success = False) then
    begin
      WriteLn(jws.LastErrorText);
      Exit;
    end;
  WriteLn('Protected header set.');


  jws.Free;
  header.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.