Halo 3 Retail Game Research

shade45 · Post by **shade45** » Sun Sep 30, 2007 1:08 pm

Digital Marine wrote:Doesn't look like it is.

EDIT:
Looks like there is some hash on the bottom of the info file to? I don't see any relation to the .map file though.

Yeah I noticed that also, I don't believe it does either.

Digital Marine · Post by **Digital Marine** » Sun Sep 30, 2007 1:15 pm

I want to say in the .map file the hash is an RSA-460. I can't really prove it...just it seems like it.

Why I don't think it's a SHA1 list? Take 460, the length of the .map hash, divided by 40, the length of a SHA1 hash, and you get 11.5. That wouldn't make sense.

Why isn't it an MD5 list? Same thing, 460 divided by 32 and you get 14.375. Again, that wouldn't make sense.

It can't be SHA256 because 256 can't even go in 460 evenly... For sure it can't be SHA384 or SHA512...

shade45 · Post by **shade45** » Sun Sep 30, 2007 1:36 pm

Your sizes are off a SHA-1 hash has a size of 20(Dec) and a MD5 hash is 16(Dec)

Digital Marine · Post by **Digital Marine** » Sun Sep 30, 2007 1:42 pm

I guess I was thinking of digit length. But still, MD5 wouldn't fit into the size. SHA1 would fit...but 23 different hashes for such a small area? That doesn't really make sense.

Anthony · Post by **Anthony** » Sun Sep 30, 2007 4:10 pm

even the raw offsets have a magic\baseaddress added to them :\

lol and if you guys keep thinking that hash is that big and in that location you will never find it

LuxuriousMeat · Post by **LuxuriousMeat** » Sun Sep 30, 2007 7:43 pm

If anyone needs help calculating the magic, I just made this function for it:

Code: Select all

        public int CalcMagic(int fileSize)
        {
            int magic = 0;
            uint magicCalc = 3218235392;

            double result = (double)fileSize / (double)16384;
            string resStr = result.ToString();
            if (int.Parse(resStr.Substring(resStr.IndexOf(".") + 1, 1)) > 5)
            {
                fileSize += 16384;
                magic = (int)magicCalc - fileSize;
            }
            else
            {
                magic = (int)magicCalc - fileSize;
            }
           
            return magic;
        }

Shadow LAG · Post by **Shadow LAG** » Mon Oct 01, 2007 9:23 am

I have some more disks to waste, Hit leo or I up msn tonight Shade and I can test a few more things.

Prey · Post by **Prey** » Mon Oct 01, 2007 10:03 am

LuxuriousMeat wrote:If anyone needs help calculating the magic, I just made this function for it:
[...]

Meh, your method is a bit long winded. Here:

Code: Select all

        private int GetMagic(int fileSize)
        {
            const uint constant = 3218235392;
            double div = (double)fileSize / 16384d;
            double diff = Math.Round(div) - div;
            if (diff > 0 && diff < .5) fileSize += 16384;
            return (int)(constant - fileSize);
        }

But neither work right for the mainmenu map.

LuxuriousMeat · Post by **LuxuriousMeat** » Mon Oct 01, 2007 10:52 am

Prey wrote:
LuxuriousMeat wrote:If anyone needs help calculating the magic, I just made this function for it:
[...]
Meh, your method is a bit long winded. Here:
Code: Select all
        private int GetMagic(int fileSize)
        {
            const uint constant = 3218235392;
            double div = (double)fileSize / 16384d;
            double diff = Math.Round(div) - div;
            if (diff > 0 && diff < .5) fileSize += 16384;
            return (int)(constant - fileSize);
        }
But neither work right for the mainmenu map.

Neither work for any campaign maps I've tried and they don't work on all of the MP maps either...

Digital Marine · Post by **Digital Marine** » Mon Oct 01, 2007 12:01 pm

This is what I used to calculate the magic while looking for stuff. Not sure if it works for all maps, but the few maps I've worked with seem to work just fine.

Code: Select all

private int GetMagic(int iFileSize)
{
Int64 iMagic = 3218235392 - iFileSize;
iMagic += iMagic % 4096;
return iMagic;
}

Well...I've changed it a little on my program....but that is basically what I do.

Anthony · Post by **Anthony** » Mon Oct 01, 2007 4:31 pm

i wouldn't bother too much with any of your guys methods. theres another way to calculate it it just needs to be found, so instead of trying to hack up a way you should just try and figure it out :p

Digital Marine · Post by **Digital Marine** » Mon Oct 01, 2007 4:58 pm

Anthony wrote:i wouldn't bother too much with any of your guys methods. theres another way to calculate it it just needs to be found, so instead of trying to hack up a way you should just try and figure it out :p

Agreed

Just out of curiosity, where did 3218235392 come from?

Anthony · Post by **Anthony** » Mon Oct 01, 2007 8:53 pm

Digital Marine wrote:
Anthony wrote:i wouldn't bother too much with any of your guys methods. theres another way to calculate it it just needs to be found, so instead of trying to hack up a way you should just try and figure it out :p
Agreed Just out of curiosity, where did 3218235392 come from?

I_F prob found the index header and subtracted whats at 0x16 by it then with that value prob added the map size

why he used the size of the map is unkown to me

shade45 · Post by **shade45** » Mon Oct 01, 2007 9:38 pm

Anthony wrote: why he used the size of the map is unkown to me

I dunno is it because the mind of a genius works in mysterious ways?

Anthony · Post by **Anthony** » Mon Oct 01, 2007 9:59 pm

shade45 wrote:
Anthony wrote: why he used the size of the map is unkown to me
I dunno is it because the mind of a genius works in mysterious ways?

i genius woulda done it the correct way in the first place

Prey · Post by **Prey** » Tue Oct 02, 2007 12:31 pm

First post updated. Also Ant, why are you being secretive about how to calculate the value? I mean if your going to keep it a secret, then could you just stop telling us that you know how? As it's not of much interest to us. Perhaps also stop talking about people that are actually helping in such a way too. Cheers, appreciated.

LuxuriousMeat · Post by **LuxuriousMeat** » Tue Oct 02, 2007 1:00 pm

Prey wrote:First post updated. Also Ant, why are you being secretive about how to calculate the value? I mean if your going to keep it a secret, then could you just stop telling us that you know how? As it's not of much interest to us. Perhaps also stop talking about people that are actually helping in such a way too. Cheers, appreciated.

I don't think he knows how, he is just saying that the way we're doing it now isn't the correct way...

Anthony · Post by **Anthony** » Tue Oct 02, 2007 2:25 pm

Prey wrote:First post updated. Also Ant, why are you being secretive about how to calculate the value? I mean if your going to keep it a secret, then could you just stop telling us that you know how? As it's not of much interest to us. Perhaps also stop talking about people that are actually helping in such a way too. Cheers, appreciated.

no where did I say i knew how... I just said its the wrong way... is it not? and i have not been so "secretive" about it because ive already helped a few people out

Prey · Post by **Prey** » Tue Oct 02, 2007 2:28 pm

Lul then you said in a very roundabout way. I apologise. Anyway lets not let this thread derail any further.

Edit: Here, I made a quick app that finds a few things in the map files that should help. Thanks Matt for running the program ^_^

Code: Select all

Name              | Header Index Offset | Actual Index Offset | Needed Subtractor
===================================================================================
005_intro.map     | -1091704276         | 130619948           | -1222324224      
010_jungle.map    | -1106744128         | 287091904           | -1393836032      
020_base.map      | -1112240656         | 383786480           | -1496027136      
030_outskirts.map | -1115160620         | 323903444           | -1439064064      
040_voi.map       | -1117284580         | 363640604           | -1480925184      
050_floodvoi.map  | -1117129820         | 360727460           | -1477857280      
070_waste.map     | -1120285260         | 388021684           | -1508306944      
100_citadel.map   | -1121314592         | 462260448           | -1583575040      
110_hc.map        | -1109401492         | 256692332           | -1366093824      
120_halo.map      | -1119668648         | 355837528           | -1475506176      
130_epilogue.map  | -1091357892         | 128516924           | -1219874816      
campaign.map      | 0                   | 0                   | 0                
chill.map         | -1093350492         | 80661412            | -1174011904      
construct.map     | -1092501472         | 86515744            | -1179017216      
cyberdyne.map     | -1093801764         | 83618012            | -1177419776      
deadlock.map      | -1096629836         | 89493940            | -1186123776      
guardian.map      | -1092043300         | 86588892            | -1178632192      
isolation.map     | -1093323984         | 100995888           | -1194319872      
mainmenu.map      | -1083644960         | 47240160            | -1130885120      
riverworld.map    | -1095009480         | 90868536            | -1185878016      
salvation.map     | -1091413144         | 68385640            | -1159798784      
shared.map        | 0                   | 0                   | 0                
shrine.map        | -1095513764         | 87480668            | -1182994432      
snowbound.map     | -1095927484         | 69773636            | -1165701120      
zanzibar.map      | -1095103188         | 111152428           | -1206255616

Anthony · Post by **Anthony** » Tue Oct 02, 2007 2:54 pm

prey you should convert them to hex instead of dec, it would make it a bit easier to read. and also it helps find any values taht are in the header unless you have yours set to display dec instead of hex =p