//=============================================================================
//    File : CSAuth.h
//     Use : Authentication between Client and Server
//           using 128-bit Enhanced SEED block cipher
//  Author : Kim Chan Ho (chkim@inca.co.kr)
//    Date : 2003/10/15
//  Modify : 2003/10/20  Refactoring to a class
//           2003/10/21  Move random part to the class
//           2003/12/01  Add GetAuthResults()
//           2003/12/10  Support unix/linux system
//           2004/02/11  Add PacketProtect stuff
//           2004/03/03  Add Key-index related functions
//           2004/04/02  Fix endian problem
//=============================================================================

#ifndef __CSAUTH_H__
#define __CSAUTH_H__


/// Type definitions
#if !defined(_WINDEF_) && !defined(_TYPEDEF_)

#define _TYPEDEF_

typedef void*          LPVOID;
typedef unsigned long  DWORD;
typedef unsigned short WORD;
typedef unsigned char  BYTE;
typedef unsigned char* LPBYTE;
typedef const char*    LPCSTR;
typedef DWORD*         LPDWORD;

#endif

#define CSAUTH_TABLE_SIZE     (8 * 5)


#if !defined(_WIN32)
#define __cdecl
#endif

#define CSAUTH_EXPORT   extern "C"


#ifdef __cplusplus
extern "C" {
#endif

// Functions
DWORD __cdecl LoadAuthTable(LPCSTR lpszPath);
DWORD __cdecl LoadAuthIndex(LPCSTR lpszPath);
DWORD __cdecl SetAuthTable(LPBYTE lpTable, DWORD dwSize);
DWORD __cdecl SetAuthIndex(DWORD dwIndex);
DWORD __cdecl InitPacketProtect(LPCSTR lpszUserKey, DWORD dwUseSeqCheck);

#ifdef __cplusplus
}
#endif


/// Class CSAuth
class CCSAuth
{
public:
   // Constructor
   CCSAuth();

   // Destructor
   ~CCSAuth();

   // Functions
   void Init();
   DWORD IsAuth();
   DWORD GetAuthDword();
   DWORD CheckAuthDword(DWORD dwReturnValue);
   DWORD GetAuthResults(DWORD dwAuthValue, LPDWORD lpdwResult, DWORD dwCount);
   DWORD EncryptPacket(LPVOID lpData, DWORD dwLength);
   DWORD DecryptPacket(LPVOID lpData, DWORD dwLength);
   DWORD PPGetLastError();

protected:
   DWORD TransAuthDword(DWORD dwAuth, int index);
   void np_srandom(DWORD initial_seed);
   DWORD np_random();
   DWORD CheckLastPacket(DWORD dwSeq);

private:
   // No copies
   CCSAuth(const CCSAuth &rhs);
   CCSAuth &operator=(const CCSAuth &rhs);

public:
   DWORD m_dwSeed;
   DWORD m_dwAuthValue;
   DWORD m_bAuth;
   DWORD m_dwCurrIndex;
   char  m_table[8][5];
   DWORD m_dwClientSequenceNumber;
   DWORD m_dwServerSequenceNumber;
   DWORD m_adwLastSeqs[12];
   DWORD m_dwPPLastError;
   DWORD m_dwSeq;
};


#endif // __CSAUTH_H__