(Delphi ActiveX) 2-Key Triple DES (112 bits)

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

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

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

...

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

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

crypt := TChilkatCrypt2.Create(Self);

// 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');
Memo1.Lines.Add(encStr);

// Now decrypt:
decStr := crypt.DecryptStringENC(encStr);
Memo1.Lines.Add(decStr);
end;