(Delphi DLL) ARC4 PRNG (Pseudo Random Number Generator)

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

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: HCkCrypt2;
key: PWideChar;
data: PWideChar;
cipherHex: PWideChar;
i: Integer;

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

crypt := CkCrypt2_Create();

// Set the encryption algorithm to ARC4:	
CkCrypt2_putCryptAlgorithm(crypt,'arc4');

// We want the encrypted output to be a hex-encoded string.
CkCrypt2_putEncodingMode(crypt,'hex');

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

// Key length is 128 bits in this example.
CkCrypt2_putKeyLength(crypt,128);
CkCrypt2_SetEncodedKey(crypt,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 := CkCrypt2__encryptStringENC(crypt,data);
    Memo1.Lines.Add(data);
    Memo1.Lines.Add(cipherHex);
    data := cipherHex;
  end;

CkCrypt2_Dispose(crypt);

end;