Pascal (Lazarus/Delphi)

Generate TOTP using Base32 Secret (6 Digits, Time-based, 30-second period)

See more Encryption Examples

Generates a 6-digit time-based TOTP code using a base32 secret with a 30-second time period. Pascal (Lazarus/Delphi)

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.Crypt2,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  crypt: TCrypt2;
  secretKey: string;
  sbKey: TStringBuilder;
  numRemoved: Integer;
  numDigits: Integer;
  timePeriod: Integer;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.
  //  
  crypt := TCrypt2.Create;

  //  Base32 secret key:
  secretKey := 'oebf ytfl qmzb p4xd 2ztf zyz4 hjrw 3uyo';

  sbKey := TStringBuilder.Create;
  success := sbKey.Append(secretKey);

  //  Remove SPACE chars.
  numRemoved := sbKey.Replace(' ','');

  //  Note: A new token is generated every 30 seconds.  You must generate within the same 30 second interval to get the same result.

  //  Generate 6 digits.
  numDigits := 6;
  //  30 second time period.
  timePeriod := 30;
  WriteLn('Your token is: ' + crypt.Totp(sbKey.GetAsString(),'base32','0','',timePeriod,numDigits,-1,'sha1'));


  crypt.Free;
  sbKey.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.