Pascal (Lazarus/Delphi)

ARC4 PRNG (Pseudo Random Number Generator)

See more Encryption Examples

Uses the ARC4 stream encryption algorithm as a pseudo random number generator. 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;

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

procedure RunDemo;
var
  crypt: TCrypt2;
  key: string;
  data: string;
  cipherHex: string;
  i: Integer;

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

  crypt := TCrypt2.Create;

  //  Set the encryption algorithm to ARC4:	
  crypt.CryptAlgorithm := 'arc4';

  //  We want the encrypted output to be a hex-encoded string.
  crypt.EncodingMode := 'hex';

  key := '000102030405060708090A0B0C0D0E0F';
  data := '12345678';

  //  Key length is 128 bits in this example.
  crypt.KeyLength := 128;
  crypt.SetEncodedKey(key,'hex');

  //  Generate 16 "random" 8-byte blocks, encoded as hex strings.
  //  This example will generate the identical output each time
  //  it is run.

  for i := 0 to 15 do
    begin
      cipherHex := crypt.EncryptStringENC(data);
      WriteLn(data);
      WriteLn(cipherHex);
      data := cipherHex;
    end;



  crypt.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.