Pascal (Lazarus/Delphi)

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

See more Encryption Examples

Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Crypt2;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  crypt: TCrypt2;
  ivHex: string;
  keyHex: string;
  encryptedStr: string;
  urlEncoded: string;
  encBase64Url: string;
  encBase64: string;
  originalStr: string;

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

  crypt := TCrypt2.Create;

  crypt.CryptAlgorithm := 'aes';
  crypt.CipherMode := 'cbc';
  crypt.KeyLength := 256;
  crypt.Charset := 'utf-8';
  crypt.EncodingMode := 'base64';

  ivHex := '000102030405060708090A0B0C0D0E0F';
  crypt.SetEncodedIV(ivHex,'hex');
  keyHex := '000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F';
  crypt.SetEncodedKey(keyHex,'hex');

  encryptedStr := crypt.EncryptStringENC('This is the original string');
  WriteLn(encryptedStr);

  //  Let's say we want to URL encode the base64 string..
  crypt.CryptAlgorithm := 'none';
  crypt.EncodingMode := 'url';
  urlEncoded := crypt.EncryptStringENC(encryptedStr);
  WriteLn(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...
  crypt.CryptAlgorithm := 'none';
  crypt.EncodingMode := 'url';
  encBase64 := crypt.DecryptStringENC(urlEncoded);
  WriteLn(encBase64);

  //  Now decrypt...
  crypt.CryptAlgorithm := 'aes';
  crypt.EncodingMode := 'base64';
  originalStr := crypt.DecryptStringENC(encBase64);
  WriteLn(originalStr);


  crypt.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.