Cracking 1/Cracking I..iso/Příklady/10.Crackujeme/CRCMe/CRCMeDlg.cpp

C/C++ Source or Header | 2002-08-07 | 5.3 KB | 195 lines

// CRCMeDlg.cpp : implementation file
//

#include "stdafx.h"
#include "CRCMe.h"
#include "Nag.h"
#include "CRCMeDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CCRCMeDlg dialog

CCRCMeDlg::CCRCMeDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CCRCMeDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CCRCMeDlg)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCRCMeDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CCRCMeDlg)
        // NOTE: the ClassWizard will add DDX and DDV calls here
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCRCMeDlg, CDialog)
    //{{AFX_MSG_MAP(CCRCMeDlg)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCRCMeDlg message handlers


BOOL CCRCMeDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    /*******Ulo₧enφ °et∞zc∙ tak, aby nebyli viditelnΘ v W32Dasm referenci °et∞zc∙.
    V hexadecimßlnφm editoru jako je nap°. Hiew si vÜechny °et∞zce bez problΘm∙ p°eΦtete:-(*******/
    BYTE BPXfailed[23] = {0x4E,0x61,0x6C,0x65,0x7A,0x65,0x6E,0x20,0x42,0x50,0x58,0x20,0x62,0x72,0x65,0x61,0x6B,0x70,0x6F,0x69,0x6E,0x74,0};
    BYTE Library[9] = {0x4B,0x65,0x72,0x6E,0x65,0x6C,0x33,0x32,0};
    BYTE APIC[12] = {0x43,0x72,0x65,0x61,0x74,0x65,0x46,0x69,0x6C,0x65,0x41, 0};
    BYTE APIR[9] = {0x52,0x65,0x61,0x64,0x46,0x69,0x6C,0x65,0};
    BYTE Openfailed[21] = {0x53,0x6F,0x75,0x62,0x6F,0x72,0x20,0x6E,0x65,0x6C,0x7A,0x65,0x20,0x6F,0x74,0x65,0x76,0xF8,0xED,0x74,0};
    BYTE CRCok[26] = {0x4B,0xF3,0x64,0x20,0x70,0x72,0x6F,0x67,0x72,0x61,0x6D, 0x75,0x20,0x6E,0x65,0x62,0x79,0x6C,0x20,0x7A,0x6D,0xEC,0x6E,0xEC, 0x6E,0};
    BYTE CRCfailed[24] = {0x4B,0xF3,0x64,0x20,0x70,0x72,0x6F,0x67,0x72,0x61,0x6D,0x75,0x20,0x62,0x79,0x6C,0x20,0x7A,0x6D,0xEC,0x6E,0xEC,0x6E,0};
    BYTE Soubor[10] = {0x43,0x52,0x43,0x4D,0x65,0x2E,0x65,0x78,0x65,0};

DulezitaOblast:
    CNag nag;  // CNag - t°φda standardnφho dialogu
    nag.DoModal();  // zobrazenφ dialogu

    HMODULE handle = GetModuleHandle((char*)Library);  // kernel32 ImageBase
    FARPROC Create = GetProcAddress(handle,(char*)APIC);  // CreateFileA
    FARPROC Read = GetProcAddress(handle,(char*)APIR);  // ReadFile

    byte CMem[4],RMem[4];
    memcpy(&CMem,Create,sizeof CMem);
    memcpy(&RMem,Read,sizeof RMem);

    /*******Kontrola p°φtomnosti bpx breakpointu na prvnφch Φty°ech bajtech funkcφ CreateFileA a ReadFile*******/
    for (int i = 0; i < 5; i++)
    {
        if (CMem[i] == 0xCC || RMem[i] == 0xCC)
        {
            SetDlgItemText(IDC_CRCSTATUS,(char*)BPXfailed);
            return TRUE;
        }
    }

    DWORD Adresa = (DWORD)&Soubor[0];
    HANDLE File;
    DWORD NOBR;

    __asm
    {
        push 0
        push FILE_ATTRIBUTE_NORMAL
        push OPEN_EXISTING
        push 0
        push FILE_SHARE_READ
        push GENERIC_READ
        push Adresa
        call Create
        mov File,eax
    }
    // File = CreateFile((char*)Soubor,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);  // zφskßnφ handlu souboru
    if (File == INVALID_HANDLE_VALUE)
    {
        // tuto chybu by ochrana m∞la vyhodnotit jako pokus o prolomenφ
        SetDlgItemText(IDC_CRCSTATUS,(char*)Openfailed);
         return TRUE;
    }

    DWORD FileSize = GetFileSize(File,NULL);
    BYTE *pMem = new BYTE[FileSize];  // alokace pam∞ti
    Adresa = (DWORD)&NOBR;

    __asm
    {
        push 0
        push Adresa
        push FileSize
        push pMem
        push File
        call Read
    }
    // ReadFile(File,pMem, Size,&NOBR,NULL);  // naΦtenφ souboru do pam∞ti

    /*******V²poΦet kontrolnφho souΦtu*******/
    __asm
    {
        mov eax,offset KonecDulObl
        sub eax,offset DulezitaOblast  // EAX = dΘlka kontrolovan²ch dat
        mov ecx,eax
        mov edi,offset DulezitaOblast
        sub edi,400000h
        add edi,pMem  // EDI = ukazatel na kontrolovanß data

        xor eax,eax
        xor ebx,ebx
        xor esi,esi
Looop:
        mov al,byte ptr [edi]  // naΦtenφ dat
        mul esi  // jednoduchΘ nßsobenφ
        add ebx,eax  // p°idßnφ v²sledku do EBX
        inc edi  // posunutφ se na dalÜφ bajt
        inc esi  // zv∞tÜenφ ESI
        loop Looop
        // --> EBX = kontrolnφ souΦet

KonecDulObl:
        cmp ebx,387D0406h
        je ok
    }
    SetDlgItemText(IDC_CRCSTATUS,(char*)CRCfailed);
    delete pMem;
    return TRUE;

ok:
    SetDlgItemText(IDC_CRCSTATUS,(char*)CRCok);
    delete pMem;
    return TRUE;
}


// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CCRCMeDlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialog::OnPaint();
    }
}

HCURSOR CCRCMeDlg::OnQueryDragIcon()
{
    return (HCURSOR) m_hIcon;
}