Built mig33 example on migpro

nowadays there are huge amount of mig33 users. most of the mig users use java emulators to get connected to the mig community. it'l be easy if someone from the wild developed a pc executable to get rid of the.jar file. In order to do so you have to understand mig33 potocols. here is what you need.
1 ==> requires you to have a basic asm knowledge because i'l be using asm examples in this article. (masm32)
2 ==> ethereal to capture packets
3 ==> midpx emulator + the .jar file from mig33.com open ethereal and java emulator with the mig jar file. Enable tracing from ethereal. Click the login button. If the login is successful stop tracing and have a look at the captured packets the highlighted portion of the packet is the data.

if you are building an application you have to pass those data to the server. I guess the explanation in the picture gives you a minimum knowledge on how they are arranged. In response mig server send two alphanumeric keys. Don’t wory abt the upper key. The only thing u have to concern is the lower key. Ok now to generate the second packet from the client. This was the most difficult part for me. But I did with the help of a java decompiler and google. It uses the java hashcode() function to get hash. You have to concatenate your pass (WARNING! Don't enter your PASWORD here!) with the randomly generated string from the mig server. Eg 4JGEahik3mypass After the concatenation find the hashcode of that string.


Here is the code which will generate the hashcode.
;=====================
.386
.model flat,stdcall
option casemap:none

include \masm32\include\windows.inc
include \masm32\include\user32.inc
include \masm32\include\kernel32.inc
includelib \masm32\lib\user32.lib
includelib \masm32\lib\kernel32.lib

GetHashCode PROTO:DWORD

.data
hCode db "4JGEahik3mypass",0

.data?
printBuffer db 100 dup(?)
storeBuffer db 100 dup(?)

.code
start:

invoke GetHashCode, addr hCode
invoke ExitProcess,0

GetHashCode proc hCodeFrmS:DWORD
LOCAL temp:DWORD
jmp @F
printtemplate db "hashcode for the above string is %xh ",0
@@:

invoke RtlZeroMemory, addr printBuffer, 100
mov temp,0
mov esi, hCodeFrmS
mov edi, offset storeBuffer

continue:
mov ecx, 1
rep movsb
mov al,[esi-1]
mov eax,temp
mov edx,31
mul edx
mov temp,eax
xor eax,eax
mov al,[esi-1]
add eax,temp
mov temp,eax
push temp
push offset printtemplate
push offset printBuffer
call wsprintfA
add esp,12
mov al,[esi]
cmp al,0
jne continue
invoke MessageBox,0, addr printBuffer,addr storeBuffer,0
ret
GetHashCode endp
end start
;=====================

this will generate the hashcode for you.
Lets see how the packet looks like in ethereal The hashcode length always is 4 bytes so don’t bother about it. Send the packet with the correct hashcode, you will be successfully

logged to mig33 server..
I hope you understand.

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