I've been working on a GUI that uses Crypto++. After a few hours of messing
around I was able to make the linker work correctly using a .lib file.
However I ran into an issue that really made me hit a brick wall and
confused me.
void encode (string data,string Skey,string &CipherText)
> {
> byte key[16];
> byte iv[16];
> string theData,cipher;
> theData = data;
> string theKey(Skey);
> int i(0);
> theKey.append("t;rke;tlrke65409654ytr");
> while(i != 16)
> {
> key[i] = theKey[i];
> iv[i] = theKey[i];
> i++;
> }
> // Cipher Text Sink
> //string *CipherText = new string;
>
> // Encryptor
> CryptoPP::ECB_Mode< CryptoPP::AES >::Encryption
> //Encryptor( key, sizeof(key), iv );
> Encryptor( key, sizeof(key));
>
> // Encryption
> CryptoPP::StringSource( theData, true,
> new CryptoPP::StreamTransformationFilter( Encryptor,
> new CryptoPP::StringSink( cipher )
> ) // StreamTransformationFilter
> ); // StringSource
> CipherText = cipher;
> }
>
> void decode (string CT,string Skey,string &RText)
> {
> byte key[16];
> byte iv[16];
> string theKey(Skey);
> string cipher,text;
> cipher = CT;
>
> int i(0);
> theKey.append("t;rke;tlrke65409654ytr");
> while(i != 16)
> {
> key[i] = theKey[i];
> iv[i] = theKey[i];
> i++;
> }
> // Decryptor
> CryptoPP::ECB_Mode< CryptoPP::AES >::Decryption
> // Decryptor( key, sizeof(key), iv );
> Decryptor( key, sizeof(key) );
>
> // Decryption
> CryptoPP::StringSource( cipher, true,
> new CryptoPP::StreamTransformationFilter( Decryptor,
> new CryptoPP::StringSink( text )
> ) // StreamTransformationFilter
> ); // StringSource
> }
>
I have used this code in a console application and it works fine with
really no errors. However once I started windows forms I got a set of
bloody errors that literally meant nothing to me.
F:\C++ Code\cryptGUI\cryptGUI\Release>cryptGUI.exe
Unhandled Exception: System.AccessViolationException: Attempted to read or
write
protected memory. This is often an indication that other memory is corrupt.
at encode(basic_string<char\,std::char_traits<char>\,std::allocator<char>
>*
, basic_string<char\,std::char_traits<char>\,std::allocator<char> >* ,
basic_str
ing<char\,std::char_traits<char>\,std::allocator<char> >* )
at aesEncrypt(basic_string<char\,std::char_traits<char>\,std::allocator
<char>
>* , basic_string<char\,std::char_traits<char>\,std::allocator<char> >*
data, b
asic_string<char\,std::char_traits<char>\,std::allocator<char> >* key) in f
:\c++
code\cryptgui\cryptgui\cryptgui\drivercode.cpp:line 141
at GUI.mainGUI.encode_Click(Object sender, EventArgs e) in f:\c++ code\
cryptg
ui\cryptgui\cryptgui\maingui.h:line 299
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button
, In
t32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr
wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms
.Uns
afeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID,
Int
32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(
Int32 r
eason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason
, ApplicationContext context)
at System.Windows.Forms.Application.RunDialog(Form form)
at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
at System.Windows.Forms.Form.ShowDialog()
at main() in f:\c++ code\cryptgui\cryptgui\cryptgui\maingui.cpp:line 13
at _mainCRTStartup()
F:\C++ Code\cryptGUI\cryptGUI\Release>
I've heard that this error is because of a bug in Crypto++ either way I
don't know how to fix it. So if anyone has ideas than or a fix to the issue
then I would grateful for that.
http://www.mediafire.com/download/8curwfrlvxlpf0p/cryptGUI.zip
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