Load a JWE from a StringBuilder

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.LoadJweSb, which loads a JWE from a StringBuilder (here read from a file) so it can be decrypted.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

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.Jwe,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  jwe: TJwe;
  sbJwe: TStringBuilder;
  bLoaded: Boolean;
  base64Key: string;
  content: string;

begin
  success := False;

  jwe := TJwe.Create;

  //  The file path is relative to the application's current working directory.  An absolute path may
  //  also be used.  Supply the path appropriate to your own environment.

  //  Load the JWE text from a file into a StringBuilder.
  sbJwe := TStringBuilder.Create;
  bLoaded := sbJwe.LoadFile('qa_data/message.jwe','utf-8');
  if (bLoaded <> True) then
    begin
      WriteLn('Failed to load the JWE file.');
      Exit;
    end;

  //  Load the JWE from the StringBuilder.
  success := jwe.LoadJweSb(sbJwe);
  if (success = False) then
    begin
      WriteLn(jwe.LastErrorText);
      Exit;
    end;

  //  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
  //  from a secure source rather than hard-coding it.
  base64Key := 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
  success := jwe.SetWrappingKey(0,base64Key,'base64');
  if (success = False) then
    begin
      WriteLn(jwe.LastErrorText);
      Exit;
    end;

  content := jwe.Decrypt(0,'utf-8');
  if (jwe.LastMethodSuccess = False) then
    begin
      WriteLn(jwe.LastErrorText);
      Exit;
    end;
  WriteLn(content);


  jwe.Free;
  sbJwe.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.