/* This file has been generated by the Hex-Rays decompiler.
   Copyright (c) 2007-2015 Hex-Rays <[email protected]>

   Detected compiler: Visual C++
*/

#include <windows.h>
#include <defs.h>


//-------------------------------------------------------------------------
// Function declarations

// HWND __usercall start@<eax>(int a1@<ebp>);
// void __userpurge WndProc(int a1@<ebx>, int a2@<edi>, HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
// HWND __userpurge GetText@<eax>(INT_PTR a1@<eax>, HWND hWnd, UINT a3, WPARAM a4, LPARAM a5);
INT_PTR __stdcall DialogFunc(HWND, UINT, WPARAM, LPARAM); // idb
// int __usercall GoodWork@<eax>(int a1@<ebp>);
// int __usercall NoLuck@<eax>(int a1@<ebp>);
// int __usercall ChFCompliance@<eax>(int a1@<ebp>, int a2@<edi>, char *a3);
// void __usercall Loop(_BYTE *a1@<esi>);
// char __usercall RegistrDown@<al>(char a1@<al>, _BYTE *a2@<esi>);
char __cdecl PassGenerate(_BYTE *a1);
// HCURSOR __stdcall LoadCursorA(HINSTANCE hInstance, LPCSTR lpCursorName);
// BOOL __stdcall MessageBeep(UINT uType);
// HICON __stdcall LoadIconA(HINSTANCE hInstance, LPCSTR lpIconName);
// HWND __stdcall SetFocus(HWND hWnd);
// int __stdcall MessageBoxA(HWND hWnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType);
// void __stdcall PostQuitMessage(int nExitCode);
// BOOL __stdcall InvalidateRect(HWND hWnd, const RECT *lpRect, BOOL bErase);
// BOOL __stdcall TranslateMessage(const MSG *lpMsg);
// BOOL __stdcall ShowWindow(HWND hWnd, int nCmdShow);
// BOOL __stdcall UpdateWindow(HWND hWnd);
// ATOM __stdcall RegisterClassA(const WNDCLASSA *lpWndClass);
// HWND __stdcall CreateWindowExA(DWORD dwExStyle, LPCSTR lpClassName, LPCSTR lpWindowName, DWORD dwStyle, int X, int Y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam);
// LRESULT __stdcall DefWindowProcA(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
// INT_PTR __stdcall DialogBoxParamA(HINSTANCE hInstance, LPCSTR lpTemplateName, HWND hWndParent, DLGPROC lpDialogFunc, LPARAM dwInitParam);
// LRESULT __stdcall DispatchMessageA(const MSG *lpMsg);
// BOOL __stdcall EndDialog(HWND hDlg, INT_PTR nResult);
// HWND __stdcall FindWindowA(LPCSTR lpClassName, LPCSTR lpWindowName);
// UINT __stdcall GetDlgItemTextA(HWND hDlg, int nIDDlgItem, LPSTR lpString, int cchMax);
// BOOL __stdcall GetMessageA(LPMSG lpMsg, HWND hWnd, UINT wMsgFilterMin, UINT wMsgFilterMax);
// HMODULE __stdcall GetModuleHandleA(LPCSTR lpModuleName);
// void __stdcall __noreturn ExitProcess(UINT uExitCode);

//-------------------------------------------------------------------------
// Data declarations

HWND hWnd = NULL; // idb
MSG Msg = { NULL, 0u, 0u, 0, 0u, { 0, 0 } }; // idb
WNDCLASSA WndClass = { 0u, NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL }; // idb
HINSTANCE hInstance = NULL; // idb
CHAR WindowName[] = "CrackMe v1.0"; // idb
CHAR ClassName[] = "No need to disasm the code!"; // idb
char aMenu[5] = "MENU"; // weak
CHAR aDlg_regis[] = "DLG_REGIS"; // idb
CHAR TemplateName[] = "DLG_ABOUT"; // idb
CHAR Caption[] = "Good work!"; // idb
CHAR Text[] = "Great work, mate!\rNow try the next CrackMe!"; // idb
CHAR aNoLuck[] = "No luck!"; // idb
CHAR aNoLuckThereMat[] = "No luck there, mate!"; // idb
CHAR byte_40217E[16] =
{
  '\0',  '\0',  '\0',  '\0',  '\0',  '\0',  '\0',  ...  '\0'
}; // idb
CHAR String[3698] =
{
  '\0',  '\0',  '\0',  '\0',  '\0',  '\0',  '\0',...  '\0',
  
}; // idb


//----- (00401000) --------------------------------------------------------
HWND __usercall start@<eax>(int a1@<ebp>)
{
  HWND result; // eax@1

  hInstance = GetModuleHandleA(0);
  result = FindWindowA(ClassName, 0);
  if ( !result )
  {
    WndClass.style = 16387;
    WndClass.lpfnWndProc = (WNDPROC)WndProc;
    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hInstance = hInstance;
    WndClass.hIcon = LoadIconA(hInstance, (LPCSTR)0x64);
    WndClass.hCursor = LoadCursorA(0, (LPCSTR)0x7F00);
    WndClass.hbrBackground = (HBRUSH)5;
    WndClass.lpszMenuName = aMenu;
    WndClass.lpszClassName = ClassName;
    RegisterClassA(&WndClass);
    hWnd = CreateWindowExA(0, ClassName, WindowName, 0xCF0000u, 180, 110, 0x8000, 0x8000, 0, 0, hInstance, 0);
    ShowWindow(hWnd, 1);
    UpdateWindow(hWnd);
    InvalidateRect(*(HWND *)(a1 + 8), 0, 1);
    while ( (unsigned __int16)GetMessageA(&Msg, 0, 0, 0) )
    {
      TranslateMessage(&Msg);
      DispatchMessageA(&Msg);
    }
    ExitProcess(Msg.wParam);
  }
  return result;
}

//----- (00401128) --------------------------------------------------------
void __userpurge WndProc(int a1@<ebx>, int a2@<edi>, HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
  int v6; // ebp@0
  int v7; // ST0C_4@21

  if ( Msg == 2 )
    goto LABEL_26;
  if ( Msg == 516 || Msg == 5 || Msg == 1 || Msg == 513 )
    return;
  if ( Msg == 36 )
  {
    *(_DWORD *)(lParam + 24) = 280;
    *(_DWORD *)(lParam + 28) = 160;
    *(_DWORD *)(lParam + 32) = 280;
    *(_DWORD *)(lParam + 36) = 160;
    return;
  }
  if ( Msg != 273 )
  {
    DefWindowProcA(hWnd, Msg, wParam, lParam);
    return;
  }
  if ( wParam == 103 )
  {
    DialogBoxParamA(hInstance, TemplateName, hWnd, DialogFunc, 0);
    return;
  }
  if ( wParam == 101 )
  {
LABEL_26:
    PostQuitMessage(0);
    return;
  }
  if ( wParam == 102 && DialogBoxParamA(hInstance, aDlg_regis, hWnd, (DLGPROC)GetText, 0) )
  {
    v7 = ChFCompliance(v6, a2, String);
    PassGenerate(byte_40217E);
    if ( v7 == a1 )
      GoodWork(v6);
    else
      NoLuck(v6);
  }
}

//----- (00401253) --------------------------------------------------------
HWND __userpurge GetText@<eax>(INT_PTR a1@<eax>, HWND hWnd, UINT a3, WPARAM a4, LPARAM a5)
{
  if ( a3 == 272 )
    return SetFocus(hWnd);
  if ( a3 == 273 )
  {
    while ( 1 )
    {
      a1 = 0;
      if ( a4 == 1003 )
        break;
      if ( a4 != 1002 )
        return 0;
      a4 = 1003;
      if ( GetDlgItemTextA(hWnd, 1000, String, 11) >= 1 )
      {
        GetDlgItemTextA(hWnd, 1001, byte_40217E, 11);
        a1 = 1;
        break;
      }
    }
  }
  else if ( a3 != 16 )
  {
    if ( a3 != 513 )
      return 0;
    InvalidateRect(hWnd, 0, 1);
    return SetFocus(hWnd);
  }
  EndDialog(hWnd, a1);
  return (HWND)1;
}

//----- (0040130A) --------------------------------------------------------
INT_PTR __stdcall DialogFunc(HWND hDlg, UINT a2, WPARAM a3, LPARAM a4)
{
  if ( a2 != 273 )
  {
    if ( a2 != 16 )
      return 0;
    goto LABEL_6;
  }
  if ( a3 == 1010 )
  {
LABEL_6:
    EndDialog(hDlg, 0);
    return 1;
  }
  return 0;
}

//----- (0040134D) --------------------------------------------------------
int __usercall GoodWork@<eax>(int a1@<ebp>)
{
  return MessageBoxA(*(HWND *)(a1 + 8), Text, Caption, 0x30u);
}

//----- (00401362) --------------------------------------------------------
int __usercall NoLuck@<eax>(int a1@<ebp>)
{
  MessageBeep(0);
  return MessageBoxA(*(HWND *)(a1 + 8), aNoLuckThereMat, aNoLuck, 0x30u);
}

//----- (0040137E) --------------------------------------------------------
int __usercall ChFCompliance@<eax>(int a1@<ebp>, int a2@<edi>, char *a3)
{
  char *v3; // esi@1
  char v4; // al@2

  v3 = a3;
  while ( 1 )
  {
    v4 = *v3;
    if ( !*v3 )
    {
      Loop(a3);
      return a2 ^ 0x5678;
    }
    if ( (unsigned __int8)v4 < 0x41u )
      break;
    if ( (unsigned __int8)v4 >= 0x5Au )
      RegistrDown(v4, v3++);
    else
      ++v3;
  }
  return MessageBoxA(*(HWND *)(a1 + 8), aNoLuckThereMat, aNoLuck, 0x30u);
}
// 40137E: could not find valid save-restore pair for esi

//----- (004013C2) --------------------------------------------------------
void __usercall Loop(_BYTE *a1@<esi>)
{
  int v1; // edi@1
  int v2; // ebx@1

  v1 = 0;
  v2 = 0;
  while ( *a1 )
  {
    LOBYTE(v2) = *a1;
    v1 += v2;
    ++a1;
  }
}

//----- (004013D2) --------------------------------------------------------
char __usercall RegistrDown@<al>(char a1@<al>, _BYTE *a2@<esi>)
{
  char result; // al@1

  result = a1 - 32;
  *a2 = result;
  return result;
}

//----- (004013D8) --------------------------------------------------------
char __cdecl PassGenerate(_BYTE *a1)
{
  int v1; // eax@1
  int v2; // edi@1
  int v3; // ebx@1
  _BYTE *i; // esi@1

  v1 = 0;
  v2 = 0;
  v3 = 0;
  for ( i = a1; ; ++i )
  {
    LOBYTE(v1) = 10;
    if ( !*i )
      break;
    LOBYTE(v3) = *i - 48;
    v2 = v3 + v1 * v2;
  }
  return v1;
}

// ALL OK, 10 function(s) have been successfully decompiled

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    cout << "Enter name:";
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    cout << "Hello " << name;
    return 0;
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About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}