(Delphi ActiveX) Encrypt / Decrypt Secure Strings

Demonstrates how to use the EncryptSecureENC and DecryptSecureENC methods to encrypt/decrypt secure strings. These methods were added in Chilkat v9.5.0.71 (released January 2018).

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
secStr1: TChilkatSecureString;
success: Integer;
crypt: TChilkatCrypt2;
encryptedStr: WideString;
secStr2: TChilkatSecureString;

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

// Load the secure string with some text.
secStr1 := TChilkatSecureString.Create(Self);
success := secStr1.LoadFile('qa_data/txt/helloWorld.txt','utf-8');
if (success <> 1) then
  begin
    Memo1.Lines.Add('Failed to load helloWorld.txt');
    Exit;
  end;

crypt := TChilkatCrypt2.Create(Self);

crypt.CryptAlgorithm := 'aes';
crypt.CipherMode := 'cbc';
crypt.KeyLength := 128;
crypt.SetEncodedKey('000102030405060708090A0B0C0D0E0F','hex');
crypt.SetEncodedIV('000102030405060708090A0B0C0D0E0F','hex');
crypt.EncodingMode := 'base64';

// Return the base64 encoded encrypted contents of secStr1.
encryptedStr := crypt.EncryptSecureENC(secStr1.ControlInterface);
Memo1.Lines.Add('Encrypted string: ' + encryptedStr);

// Output:
// Encrypted string: qiq+IFhcjTkEIkZyf31V/g==

// Decrypt to secStr2:
secStr2 := TChilkatSecureString.Create(Self);
crypt.DecryptSecureENC(encryptedStr,secStr2.ControlInterface);

// Access the contents of secStr2
Memo1.Lines.Add('Decrypted string: ' + secStr2.Access());

// Output:
// Decrypted string: Hello World!
end;