(Delphi DLL) AES Encrypt String (utf-8 byte representation) and return Base64

Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format.

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;
ivHex: PWideChar;
keyHex: PWideChar;
encryptedStr: PWideChar;
urlEncoded: PWideChar;
encBase64Url: PWideChar;
encBase64: PWideChar;
originalStr: PWideChar;

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

crypt := CkCrypt2_Create();

CkCrypt2_putCryptAlgorithm(crypt,'aes');
CkCrypt2_putCipherMode(crypt,'cbc');
CkCrypt2_putKeyLength(crypt,256);
CkCrypt2_putCharset(crypt,'utf-8');
CkCrypt2_putEncodingMode(crypt,'base64');

ivHex := '000102030405060708090A0B0C0D0E0F';
CkCrypt2_SetEncodedIV(crypt,ivHex,'hex');
keyHex := '000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F';
CkCrypt2_SetEncodedKey(crypt,keyHex,'hex');

encryptedStr := CkCrypt2__encryptStringENC(crypt,'This is the original string');
Memo1.Lines.Add(encryptedStr);

// Let's say we want to URL encode the base64 string..
CkCrypt2_putCryptAlgorithm(crypt,'none');
CkCrypt2_putEncodingMode(crypt,'url');
urlEncoded := CkCrypt2__encryptStringENC(crypt,encryptedStr);
Memo1.Lines.Add(urlEncoded);

// Sample output:

//  q3fmgEqjqa9o//ZS6aPuh4Wtbrrxx/WOIQSKeVnesZg=
//  q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D

// -------------------------------------------------------------------
// Now let's do the reverse...
// 

// We start with a string that is the binary encrypted data, base64 encoded, and then URL encoded.
encBase64Url := 'q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D';

// We'll use the same crypt object.  If using a new instance of the crypt object,
// make sure *all* settings are identical:  the algorithm, cipher mode, key length, charset, encoding mode, IV, and secret key.

// Decode from URL...
CkCrypt2_putCryptAlgorithm(crypt,'none');
CkCrypt2_putEncodingMode(crypt,'url');
encBase64 := CkCrypt2__decryptStringENC(crypt,urlEncoded);
Memo1.Lines.Add(encBase64);

// Now decrypt...
CkCrypt2_putCryptAlgorithm(crypt,'aes');
CkCrypt2_putEncodingMode(crypt,'base64');
originalStr := CkCrypt2__decryptStringENC(crypt,encBase64);
Memo1.Lines.Add(originalStr);

CkCrypt2_Dispose(crypt);

end;