Pascal (Lazarus/Delphi)

Fortuna PRNG Generate Random Encoded

See more PRNG Examples

Demonstrates how to generate random bytes using the Fortuna PRNG. The random bytes are returned in an encoded string (using an encoding such as hex, base64, base58, etc.) 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.Prng;

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

procedure RunDemo;
var
  success: Boolean;
  fortuna: TPrng;
  strEntropy: string;
  strRandHex: string;
  strRandBase64: string;
  strRandBase58: string;

begin
  success := False;

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

  success := False;

  fortuna := TPrng.Create;

  //  Before beginning to generate random data, 
  //  the PRNG (Pseudo Random Number Generator) should
  //  be seeded with real random data (also known as "entropy").

  //  Note: Accumulating real random data can be difficult
  //  and time-consuming to collect.  It is for this reason
  //  that pseudorandom data (i.e. a PRNG) is used.  The pseudorandom data generator
  //  is seeded with entropy.  In addition, new entropy can (and should)
  //  be periodically added as more pseudorandom data is generated.

  //  Get 32 bytes of system entropy.  On Linux/Unix systems, this reads
  //  from /dev/random.  On MS Windows systems, it uses the Crypto API's 
  //  CryptGenRandom function.
  strEntropy := fortuna.GetEntropy(32,'hex');
  if (fortuna.LastMethodSuccess <> True) then
    begin
      WriteLn(fortuna.LastErrorText);
      Exit;
    end;

  //  Seed the PRNG with this entropy:
  success := fortuna.AddEntropy(strEntropy,'hex');
  if (success <> True) then
    begin
      WriteLn(fortuna.LastErrorText);
      Exit;
    end;

  //  Generate some random data:
  strRandHex := fortuna.GenRandom(16,'hex');
  strRandBase64 := fortuna.GenRandom(22,'base64');
  strRandBase58 := fortuna.GenRandom(32,'base58');

  WriteLn('hex random bytes: ' + strRandHex);
  WriteLn('base64 random bytes: ' + strRandBase64);
  WriteLn('base58 random bytes: ' + strRandBase58);


  fortuna.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.