2-Key Triple DES

Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption).

Download Chilkat Crypt ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATCRYPT2Lib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: TChilkatCrypt2;
success: Integer;
keyHex: String;
encStr: String;
decStr: String;

begin
crypt := TChilkatCrypt2.Create(Self);

success := crypt.UnlockComponent('Anything for 30-day trial.');
if (success <> 1) then
  begin
    ShowMessage('Crypt component unlock failed');
    Exit;
  end;

//  Specify 3DES for the encryption algorithm:
crypt.CryptAlgorithm := '3des';

crypt.CipherMode := 'ecb';

//  For 2-Key Triple-DES, use a key length of 128
//  (Given that each byte's msb is a parity bit, the strength is really 112 bits).
crypt.KeyLength := 128;

//  Pad with zeros
crypt.PaddingScheme := 3;

//  EncodingMode specifies the encoding of the output for
//  encryption, and the input for decryption.
//  It may be "hex", "url", "base64", or "quoted-printable".
crypt.EncodingMode := 'hex';

//  Let's create a secret key by using the MD5 hash of a password.
//  The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
crypt.HashAlgorithm := 'md5';
keyHex := crypt.HashStringENC('secretPassword');

//  Set the encryption key:
crypt.SetEncodedKey(keyHex,'hex');

//  Encrypt
encStr := crypt.EncryptStringENC('The quick brown fox jumped over the lazy dog');
ShowMessage(encStr);

//  Now decrypt:
decStr := crypt.DecryptStringENC(encStr);
ShowMessage(decStr);
end;