TDCP_rijndael *Cipher = new TDCP_rijndael (this);

String KeyStr = KeyEdit->Text;

String encrypted = EncryptedEdit->Text;
String decrypted = “”;

Cipher->InitStr (KeyStr, __classid (TDCP_sha1));

decrypted = Cipher->DecryptString(encrypted);
DecryptedEdit->Text = decrypted;

Cipher->Burn();
Cipher->Free();

Now of course my decrpyt doesn’t work… Basically I have encrypted a string using mySQL’s AES_ENCRYPT() and am now trying to decrpyt back to plain text using the above code. I have the correct key etc, anyone have any idea? Should I be passing the encrypted message in a non-text format, like binary or something?

Thanks muchly!

Cipher.InitStr(KeyStr,TDCP_sha1);

Which in C++ Builder would be:

Cipher->InitStr(KeyStr,TDCP_sha1);

But it kicks up a fuss about: Improper use of typedef ‘TDCP_sha1′ other people seem to of had this problem, but I tried their solution and it still had problems: http://www.c-plusplus.de/forum/viewtopic-var-t-is-119771.html

Cheers

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, -> DCPcrypt2, DCPrc4, DCPsha1 <– I Add This then all work;

type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
i: integer;
Cipher: TDCP_rc4;
KeyStr: string;
begin
KeyStr:= ”;
if InputQuery(’Passphrase’,'Enter passphrase’,KeyStr) then // get the passphrase
begin
Cipher:= TDCP_rc4.Create(Self);
Cipher.InitStr(KeyStr,TDCP_sha1); // initialize the cipher with a hash of the passphrase
for i:= 0 to Memo1.Lines.Count-1 do // decrypt the contents of the memo
Memo1.Lines[i]:= Cipher.DecryptString(Memo1.Lines[i]);
Cipher.Burn;
Cipher.Free;
end;
end;

Here’s the code snippet, I have the unit :

#include “dcpsha1.hpp”

.
.
.

int i;
TDCP_rc4 *Cipher;
String KeyStr;

Cipher->InitStr(KeyStr,TDCP_sha1); // this causes ERROR: Improper use of typedef ‘TDCP_sha1′

did the unit library is already included properly at the uses ?
as when you do the “chiper.initstr(KeyStr,TDCP_sha1)”, you use TDCP_Sha1 component and for that you
need to include the DCPsha1 unit on the library .

But I’m haivng trouble converting the really simple delphi example to C++ just on one line:

Cipher.InitStr(KeyStr,TDCP_sha1);

It says Cipher.InitStr expects a TMetaClass* where ‘TDCP_sha1′ us shown in the above line, I’vew tried everything and I can’t work out what to pass in there for c++ any ideas?

Cheers!

P.S – Simple delphi example below:

procedure TForm1.btnDecryptClick(Sender: TObject);
var
i: integer;
Cipher: TDCP_rc4;
KeyStr: string;
begin
KeyStr:= ”;
if InputQuery(’Passphrase’,'Enter passphrase’,KeyStr) then // get the passphrase
begin
Cipher:= TDCP_rc4.Create(Self);
Cipher.InitStr(KeyStr,TDCP_sha1); // initialize the cipher with a hash of the passphrase
for i:= 0 to Memo1.Lines.Count-1 do // decrypt the contents of the memo
Memo1.Lines[i]:= Cipher.DecryptString(Memo1.Lines[i]);
Cipher.Burn;
Cipher.Free;
end;
end;