AES Encryption

AES encryption. The Chilkat encryption component supports 128-bit, 192-bit, and 256-bit AES encryption in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) modes.

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;
ivHex: String;
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.LastErrorText);
    Exit;
  end;

//  AES is also known as Rijndael.
crypt.CryptAlgorithm := 'aes';

//  CipherMode may be "ecb" or "cbc"
crypt.CipherMode := 'cbc';

//  KeyLength may be 128, 192, 256
crypt.KeyLength := 256;

//  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.  AES has a block
//  size of 16 bytes, so encrypted output is always
//  a multiple of 16.
crypt.PaddingScheme := 0;

//  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';

//  An initialization vector is required if using CBC mode.
//  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 := '000102030405060708090A0B0C0D0E0F';
crypt.SetEncodedIV(ivHex,'hex');

//  The secret key must equal the size of the key.  For
//  256-bit encryption, the binary secret key is 32 bytes.
//  For 128-bit encryption, the binary secret key is 16 bytes.
keyHex := '000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F';
crypt.SetEncodedKey(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 16).
//  Because the output is a hex string, it should
//  be 96 characters long (2 chars per byte).
encStr := crypt.EncryptStringENC('The quick brown fox jumps over the lazy dog.');
ShowMessage(encStr);

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