Defense Grid *.DGP

XRaptor · **Joined:** Sat Jul 12, 2008 4:42 pm **Posts:** 21

Hi, one simple question - is there someone who tried to get info about game files? I tried but there is any CRC and every editation makes game crash with message about damaged data. I thout that it is SHA1 or just modified value from SHA1 hash, but not sure.

Check attached 2 simple files (index data inside) and take a look on it. I think that CRC value is on last 20 bytes.

Attachment:

files.rar

XRaptor · **Joined:** Sat Jul 12, 2008 4:42 pm **Posts:** 21

Hmm, no one wanna try?

aluigi · **Posted:** Wed Oct 14, 2009 11:31 pm

*updated tool*

XRaptor · **Joined:** Sat Jul 12, 2008 4:42 pm **Posts:** 21

Thnx for help. I have Steam version and I think that algorithm is little different from demo. Exe file is here:
http://rapidshare.com/files/293231003/DefenseGrid.rar

aluigi · **Posted:** Thu Oct 15, 2009 8:52 am

ops I just noticed that instead in the full game the hash is simply xored with that special sequence of bytes without modifications to the sha1 algorithm like happens on the demo.
I will update the tool but in any case it's only a xor operation so you can do it also manually

XRaptor · **Joined:** Sat Jul 12, 2008 4:42 pm **Posts:** 21

oh, simple, got it :-)

thnx for help

aluigi · **Posted:** Thu Oct 15, 2009 9:26 am

tool updated, check my first post

XRaptor · **Joined:** Sat Jul 12, 2008 4:42 pm **Posts:** 21

aluigi wrote:

tool updated, check my first post

Well, I think it doesn't work :-)

Hash is counted ok, but writing back to file doesn't work.

aluigi · **Posted:** Mon Oct 19, 2009 4:04 pm

uhmmm what you mean with "doesn't work"?
do you receive an error from the tool?
the output file has something strange?

how was your input file?
I mean had it already an hash (correct or wrong) at its end or just nothing?

here everything works perfectly overwriting the input file (dgridhash -o input_file input_file), so check if you have specified the correct options in case your input file doesn't have an hash at the end.

XRaptor · **Joined:** Sat Jul 12, 2008 4:42 pm **Posts:** 21

aluigi wrote:

uhmmm what you mean with "doesn't work"?
do you receive an error from the tool?
the output file has something strange?

how was your input file?
I mean had it already an hash (correct or wrong) at its end or just nothing?

here everything works perfectly overwriting the input file (dgridhash -o input_file input_file), so check if you have specified the correct options in case your input file doesn't have an hash at the end.

-a and -r switches are not working. Hash is never writed to file. -o seems to be working

aluigi · **Posted:** Tue Oct 20, 2009 11:02 am

here everything works.

for example I took data0001.dgp and copied it in another folder then I removed the 20 bytes hash at its end and then I launched:
dgridhash -a -o Z:\data0001.dgp Z:\data0001.dgp

and now the file is exactly like the original.

remember that the -o is necessary to write the file because "dgridhash file" does NOT overwrite the same file but simply calculates and shows its hash. any write operation is performed with -o

XRaptor · **Joined:** Sat Jul 12, 2008 4:42 pm **Posts:** 21

aluigi wrote:

remember that the -o is necessary to write the file because "dgridhash file" does NOT overwrite the same file but simply calculates and shows its hash. any write operation is performed with -o

So that's the problem, there is no info that -o switch must be provided :-)

I just tried -a and -r + filename

aluigi · **Posted:** Thu Nov 19, 2009 9:32 pm

I have written a bms script for the dgp files:
http://aluigi.org/papers/bms/defense_grid.bms

you must select only the file contains the number 0000 like data0000.dgp or enus0000.dgp (so the first dgp of the collection) because that one is the index file

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