Restructure repository to include all source folders

Move git root from Client/ to src/ to track all source code:
- Client: Game client source (moved to Client/Client/)
- Server: Game server source
- GameTools: Development tools
- CryptoSource: Encryption utilities
- database: Database scripts
- Script: Game scripts
- rylCoder_16.02.2008_src: Legacy coder tools
- GMFont, Game: Additional resources

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Server/RylServerProject/RylGameLibrary/GameGuardLib/CSAuth.h

@@ -0,0 +1,107 @@
+//=============================================================================
+//    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__
+