(Delphi ActiveX) AES Encryption

See more Encryption Examples

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

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;
ivHex: WideString;
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);

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

// CipherMode may be "ecb", "cbc", "ofb", "cfb", "gcm", etc.
// Note: Check the online reference documentation to see the Chilkat versions
// when certain cipher modes were introduced.
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.');
Memo1.Lines.Add(encStr);

// This is the encrypted output in hex format:
// 4846F83AA211E239AA62A21F527F089EE9DDBEAD30EE15D4E79B607A621B97BEDB9B6F00A9B21F1B43A50B4C1BE0EDF2

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

// This is the decrypted string:
// The quick brown fox jumps over the lazy dog.
end;