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Delphi DLL Examples


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(Delphi DLL) AES Encryption

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 non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX 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;
success: Boolean;
ivHex: PWideChar;
keyHex: PWideChar;
encStr: PWideChar;
decStr: PWideChar;

begin
crypt := CkCrypt2_Create();

success := CkCrypt2_UnlockComponent(crypt,'Anything for 30-day trial');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

//  AES is also known as Rijndael.
CkCrypt2_putCryptAlgorithm(crypt,'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.
CkCrypt2_putCipherMode(crypt,'cbc');

//  KeyLength may be 128, 192, 256
CkCrypt2_putKeyLength(crypt,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.
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 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';
CkCrypt2_SetEncodedIV(crypt,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';
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 16).
//  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;

 

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