LuTiN NoIR Small RSA keygenme for newbies

In February, Le_MaLaDe reopened UFDC (Université Française de Cracking)

The first challenge of the 'Competence 5' is a packed (ASPack) KeygenMe: LuTiN NoIR Small RSA keygenme for newbies (Yeah, the site is from 2000-2002 it's old)

Protection: MD5+RSA.

For make fast:

M = C^D mod N

M = MD5(NAME)

You grab N inside (2F774486FD3B97FFA559687F7F9D5335CA3D16FBB60C0019)

And factorise it with RSA-Tool 2 by tE, after few seconds/mins you get P and Q

PRIME FACTOR: 69EF193F0EC20A9E57B455DB

PRIME FACTOR: 72B4BF519A43852C9F9C761B

Now with that you calculate D: 2312552808E487A2F561E2BBEF5FB7275C2BD350491DB9A1

MD5 for "Xylitol": 9F01C4DEFB31F597423AC2E0CAB0FA54

Now rSab0x:

Name: Xylitol

Serial: 1A82A1823B1445B66580029237258D411C788A202D982451

I wanted make a keygen in PHP but finaly i've not found a RSA classe for do it

so i hope you like assembly... :)

The code seem crappy in blogspot :'(

base.asm:

.386

.model  flat, stdcall

option  casemap :none

include     windows.inc

include     user32.inc

include     kernel32.inc

include     comctl32.inc

include     \masm32\macros\macros.asm

includelib  user32.lib

includelib  kernel32.lib

includelib  comctl32.lib

include     winmm.inc

includelib  winmm.lib

include     biglib.inc

includelib  biglib.lib

include     cryptohash.inc

includelib  cryptohash.lib

include     ufmod.inc

includelib  ufmod.lib

DlgProc     PROTO :DWORD,:DWORD,:DWORD,:DWORD

.const

IDD_MAIN      EQU 1000

IDB_EXIT      EQU 1001

IDC_NAME      EQU 1002

IDC_SERIAL    EQU 1005

IDB_GENERATE  EQU 1006

IDB_ABOUT     EQU 1007

IDI_ICON      EQU 100

MAXSIZE       EQU 512

.data

N           db  "2F774486FD3B97FFA559687F7F9D5335CA3D16FBB60C0019",0

D           db  "2312552808E487A2F561E2BBEF5FB7275C2BD350491DB9A1",0

.data?

hInstance   dd  ?

szName          db  MAXSIZE dup(?)

szSerial        db  MAXSIZE dup(?)

szHash          db  MAXSIZE dup(?)

BigN        dword ?

BigD        dword ?

BigC        dword ?

BigM        dword ?

.code

start:

    invoke  GetModuleHandle, NULL

    mov hInstance, eax

    invoke  DialogBoxParam, hInstance, IDD_MAIN, 0, offset DlgProc, 0

    invoke  ExitProcess, eax

    invoke  InitCommonControls

DlgProc proc uses esi edi hWnd:DWORD,uMsg:DWORD,wParam:DWORD,lParam:DWORD

        mov eax,uMsg

            .if eax == WM_INITDIALOG

                invoke  LoadIcon,hInstance,200

                invoke  SendMessage, hWnd, WM_SETICON, 1, eax

                invoke uFMOD_PlaySong,666,hInstance,XM_RESOURCE

                invoke  GetDlgItem,hWnd,IDC_NAME

                invoke  SendMessage,eax,EM_LIMITTEXT,60,0

                invoke  GetDlgItem,hWnd,IDC_SERIAL

                invoke  SendMessage,eax,EM_LIMITTEXT,32,0

                jmp @KEYGENNiNG

            .elseif eax == WM_COMMAND

                mov eax,wParam

                    .if eax == IDB_EXIT

                       

                        invoke  SendMessage, hWnd, WM_CLOSE, 0, 0

                    .elseif ax == IDC_NAME

                        shr eax, 16

                        .if ax == EN_CHANGE

                            jmp @KEYGENNiNG

                        .endif

                    .elseif eax == IDB_GENERATE

                        @KEYGENNiNG:

                            invoke GetDlgItemText,hWnd,IDC_NAME,addr szName,MAXSIZE

                            cmp eax,0

                            jnz @NEXT

                            invoke  SetDlgItemText,hWnd,IDC_SERIAL,chr$('Enter your name, buddy!')

                        @NEXT:

                            mov edx,eax

                            invoke  MD5Init

                            invoke  MD5Update,addr szName,edx

                            invoke  MD5Final

                            invoke HexEncode,eax,MD5_DIGESTSIZE,addr szHash

                            invoke _BigCreate,0

                            mov BigN,eax

                            invoke _BigCreate,0

                            mov BigD,eax

                            invoke _BigCreate,0

                            mov BigC,eax

                            invoke _BigCreate,0

                            mov BigM,eax

                            invoke  _BigIn,addr N,16,BigN

                            invoke  _BigIn,addr D,16,BigD

                            invoke  _BigIn,addr szHash,16,BigM

                            invoke  _BigPowMod,BigM,BigD,BigN,BigC

                            invoke  _BigOutB16,BigC,addr szSerial

                            invoke  SetDlgItemText,hWnd,IDC_SERIAL,addr szSerial

                            invoke  RtlZeroMemory,addr szName,sizeof szName

                            invoke  RtlZeroMemory,addr szHash,sizeof szHash  

                            invoke  RtlZeroMemory,addr szSerial,sizeof szSerial

                            invoke _BigDestroy,BigN

                            invoke _BigDestroy,BigD

                            invoke _BigDestroy,BigC

                            invoke _BigDestroy,BigM

                    .endif

            .elseif eax == WM_CLOSE

                invoke uFMOD_PlaySong,0,0,0

                invoke  EndDialog, hWnd, 0

            .endif

        XOR EAX,EAX

        RET

DlgProc endp

end start

base.rc:

;This Resource Script was generated by WinAsm Studio.

#define IDD_MAIN 1000

#define IDB_EXIT 1001

#define IDC_STATIC1003 1003

#define IDC_STATIC1004 1004

#define IDC_NAME 1002

#define IDC_SERIAL 1005

#define IDB_GENERATE 1006

#define IDI_ICON 100

#define IDC_IMAGE1008 1008

#define IDC_STATIC1009 1009

#define tune 666

1 24 DISCARDABLE "manifest.xml"

IDI_ICON ICON DISCARDABLE "app.ico"

946 BITMAP DISCARDABLE "5ab9y001.bmp"

tune RCDATA DISCARDABLE "music.xm"

IDD_MAIN DIALOGEX 10,10,392,135

CAPTION "LuTiN NoIR Small RSA keygenme for newbies *KeyGen*"

FONT 8,"Tahoma"

STYLE 0x90c80804

EXSTYLE 0x00000188

BEGIN

    CONTROL "Exit",IDB_EXIT,"Button",0x10010000,343,120,45,13,0x00000000

    CONTROL "Xylitol",IDC_NAME,"Edit",0x50010000,27,89,360,13,0x00000200

    CONTROL "Name",IDC_STATIC1003,"Static",0x50000000,3,89,20,8,0x00000000

    CONTROL "Serial",IDC_STATIC1004,"Static",0x50000000,4,108,20,9,0x00000000

    CONTROL "",IDC_SERIAL,"Edit",0x50010800,27,105,360,12,0x00000200

    CONTROL "GEN",IDB_GENERATE,"Button",0x10010000,297,120,44,13,0x00000000

    CONTROL "#946",IDC_IMAGE1008,"Static",0x5080020e,3,3,384,81,0x00000000

    CONTROL "17/03/2011",IDC_STATIC1009,"Static",0x58000000,0,126,81,7,0x00000000

END

cryptohash for the MD5, biglib for RSA and ufmod for the music...

these libs are easy to find ;)

Also if you want play with RSA, try Xyl Crypto-KeygenMe 2: rEvErs0rEd :þ