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gina

Posted on 2000-03-18
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I'm developing a security system using smart cards. I'm also trying  to use these cards to login to Windows NT, so I'm creating a custom GINA library.

I'm working with the original msgina.dll but I have a problem when reading the characters from the smart card because these are stored in ASCII code and GINA is expecting an unsigned short.

I was wondering if you could help me solve this problem. Thank you.

Thiel Fischer
thiel@telcom.net
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Question by:thiel
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7 Comments
 
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Accepted Solution

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jhance earned 90 total points
ID: 2632229
thiel,

All of the GINA functions use UNICODE and not ASCII.  wchar_t is defined as:

#define wchar_t unsigned short

Since a GINA library is NT only, you probably just want to set UNICODE as the default in your project build options.  Otherwise, make sure you are using wchar_t and doing the proper conversions to/from char wherever required.
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Author Comment

by:thiel
ID: 2632379
How I make the convertions from a char[16] to a wchar_t
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LVL 32

Expert Comment

by:jhance
ID: 2633032
Before I do that, please tell me why you need to do it.  If you choose to build this applications as a pure UNICODE project, there should be no need for this.

In an MFC or ATL app, you can include afxpriv.h which include a whole set of character conversion macros.  The A2W macro will convert from char to wchar_t.

Otherwise, there is the MultiByteToWideChar function.
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Author Comment

by:thiel
ID: 2633741
I'm using char types beacuse it is what I receive from the reader and also the Gina project is already builded.

I tried the following

WideCharToMultiByte(CP_ACP,0,pMini->pszUsername,-1,cadena,sizeof(cadena),NULL,NULL);

But when Gina runs returns the following error:

Initialization of the dynamic link library c:\winnt\system32\inetmib1.dll failed. The process is terminatig abnormally.

Then the Winlogon aplication ends and the system automaticaly reboot the machine.
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Author Comment

by:thiel
ID: 2633771
Also I tried to use the following convertions


AsciiToUnicode(pMini->pszUsername,cadena);


void
AsciiToUnicode(PWCHAR dst, char *src)
{
  while (*src)
    *dst++ = (WCHAR)*src++;
  *dst = 0;
}

cadena is a char[16] variable

but the winlogon return the following error:

The Instruction at "0x10001a43" referenced memory at "0x007300069". The memory could not be "written".

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LVL 32

Expert Comment

by:jhance
ID: 2633810
Initialization of the dynamic link library c:\winnt\system32\inetmib1.dll failed

This has nothing that I can think of to do with MultiByteToWideChar().

You have:

WideCharToMultiByte(CP_ACP,0,pMini->pszUsername,-1,cadena,sizeof(cadena),NULL,NULL);

the DESTINATION of the conversion operation is NULL.  That's not good...

You also have 8 arguments to this function, I only count 6:

int MultiByteToWideChar(
  UINT CodePage,         // code page
  DWORD dwFlags,         // character-type options
  LPCSTR lpMultiByteStr, // string to map
  int cbMultiByte,       // number of bytes in string
  LPWSTR lpWideCharStr,  // wide-character buffer
  int cchWideChar        // size of buffer
);


Here is a sample that I put together using this function as well as a manual way similar to what you've done:


#include "stdafx.h"
#include "Ansi2Unicode.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

CWinApp theApp;

using namespace std;

BOOL AnsiToUnicode(wchar_t *dst, char *src)
{
      if(dst == NULL || src == NULL){
            return FALSE;
      }

      memset(dst, 0, (strlen(src)+1) * 2);

      while(*src){
            *dst = (wchar_t)*src;
            dst++;
            src++;
      }

      return TRUE;
}

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{

      // The string to convert
      char *lpszSource = "This is only a test";

      // Destination for MultiByteToWideChar
      wchar_t *wszDest1 = new wchar_t[(strlen(lpszSource)+1) * 2];

      // Destination for AnsiToUnicode function
      wchar_t *wszDest2 = new wchar_t[(strlen(lpszSource)+1) * 2];

      // Have Windows convert it.
      MultiByteToWideChar(CP_ACP, 0, lpszSource, -1, wszDest1, (strlen(lpszSource)+1) * 2);

      // Do it the hard way.
      if(AnsiToUnicode(wszDest2, lpszSource)){
            cerr << "OK" << endl;
      }
      else{
            cerr << "Error" << endl;
      }

      // See if they are the same
      if(wcscmp(wszDest1, wszDest2) == 0){
            cerr << "Same" << endl;
      }
      else{
            cerr << "Different" << endl;
      }

      delete [] wszDest1;
      delete [] wszDest2;


      return 0;
}
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LVL 32

Expert Comment

by:jhance
ID: 2633814
Oops!  I'm sorry, you're using WideCharToMultiByte.  This converts a UNICODE to ASCII.

You want to call MultiByteToWideChar.

That is what I said, isn't it????

Yes, I said:

>>Otherwise, there is the MultiByteToWideChar function.
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