Delphi DLL

3DES Encryption, ECB, CBC modes

See more Encryption Examples

3DES encryption. The Chilkat encryption component supports Triple-DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes. Delphi 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;
ivHex: PWideChar;
keyHex: PWideChar;
encStr: PWideChar;
decStr: PWideChar;

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

crypt := CkCrypt2_Create();

// Specify 3DES for the encryption algorithm:
CkCrypt2_putCryptAlgorithm(crypt,'3des');

// CipherMode may be "ecb" or "cbc"
CkCrypt2_putCipherMode(crypt,'cbc');

// KeyLength must be 192.  3DES is technically 168-bits;
// the most-significant bit of each key byte is a parity bit,
// so we must indicate a KeyLength of 192, which includes
// the parity bits.
CkCrypt2_putKeyLength(crypt,192);

// The padding scheme determines the contents of the bytes
// that are added to pad the result to a multiple of the
// encryption algorithm's block size.  3DES has a block
// size of 8 bytes, so encrypted output is always
// a multiple of 8.
CkCrypt2_putPaddingScheme(crypt,0);

// EncodingMode specifies the encoding of the output for
// encryption, and the input for decryption.
// It may be "hex", "url", "base64", or "quoted-printable".
CkCrypt2_putEncodingMode(crypt,'hex');

// An initialization vector is required if using CBC or CFB modes.
// ECB mode does not use an IV.
// The length of the IV is equal to the algorithm's block size.
// It is NOT equal to the length of the key.
ivHex := '0001020304050607';
CkCrypt2_SetEncodedIV(crypt,ivHex,'hex');

// The secret key must equal the size of the key.  For 
// 3DES, the key must be 24 bytes (i.e. 192-bits).
keyHex := '000102030405060708090A0B0C0D0E0F0001020304050607';
CkCrypt2_SetEncodedKey(crypt,keyHex,'hex');

// Encrypt a string...
// The input string is 44 ANSI characters (i.e. 44 bytes), so
// the output should be 48 bytes (a multiple of 8).
// Because the output is a hex string, it should
// be 96 characters long (2 chars per byte).
encStr := CkCrypt2__encryptStringENC(crypt,'The quick brown fox jumps over the lazy dog.');
Memo1.Lines.Add(encStr);

// Now decrypt:
decStr := CkCrypt2__decryptStringENC(crypt,encStr);
Memo1.Lines.Add(decStr);

CkCrypt2_Dispose(crypt);

end;