Xbox shrinking tool needed (Page 1 of 2)

great, thanks for the link, very interesting for research
will take a look after figuring out the 3ds decryption

OK, test it on "Petit Copter (Japan).iso"

2 executables

1) xbox_dernd.exe - derandomizer

like "nasos deux", it doesn't change the structure of the file, just replaces "random data block" with block full of "JUNK", it is like zeroing but it serves as a mark

you will get a file called "Petit Copter (Japan).f401863e.iso"
f401863e is a seed for the random generator

2) xboxRegen.exe - regenerator of random data

replaces blocks full of "JUNK" with random data blocks, generated by using seed number

xbox_dernd is tweaked to be compatible with the Petit Copter for test purpose
the tweak is, that it bruteforces only 1/16 part of full range
from 0xf0000000 to 0xffffffff (f401863e)
to speed up the test process, it tooks about 8 seconds on my rig
brutforcing the full range will took about 8 minutes

P.S. 7zipped iso is 48,7 Mb

Great work, keep on saving me a loooooot of space on my rigs!

Hello!

1) 1 seed value for entire disc, since current tool uses only one thread brutrforcing takes around 8 minutes on modern PC, I'll try to speed it up

2) I cannot tell for sure about nNASOS, if it uses the first version of NASOS, no it fills garbage blocks with zeroes and should have header block with marks which block uses garbage padding.
NASOS deux replaces garbage with "JUNK", and the image is playable in emulator
http://forum.redump.org/topic/17831/nasos-2/

3) Yes, this version supporting one game only

one more thing we need is a security sectors ranges, they are unique for every game, and we have to specify it

since redump does have this info, this is not a problem

I included sample "ss.txt" in archive and updated xbox_dernd tool so it can support it
also i unlocked brutforce range to full range

test it!

P.S. Silent Hill 2 is 1,77 GB 7zipped
P.S.S. you should place "ss.txt" in the folder with iso

LOL, i got it, because xboxregen also needs "ss.txt" and i forgot to add the support, lame i am

Of course it's possible that either the dump is corrupt or the ss.txt is bad. Plz paste the contents of the ss.txt.

Can you also use xboxregen on the 2002 FIFA World Cup "cleaned" ISO and confirm it restores to the original hashes?

I will do more tests tomorrow night.

Maybe is the padding generator.
In any case, this is the "ss.txt" I made with the SS from the redump page of the UEFA http://redump.org/disc/52675/:

291148,295243
442992,447087
681096,685191
908456,912551
1066974,1071069
1218274,1222369
1372342,1376437
1530846,1534941
2214524,2218619
2371192,2375287
2526846,2530941
2676146,2680241
2832990,2837085
3067338,3071433
3222090,3226185
3454438,3458533

I tried to restored the iso of the "2002 FIFA World Cup" and YES, the iso restored matches the original iso !!!

One doubt, is there any restriction when naming the iso?
Is it necessary to keep the seed in the name?
Or could it be kept separate?

Is it possible to generate the real SS sectors contents, without padding them with zeroes? What is the logic in different amounts of readable/unreadable sectors in different blocks?

About the timestamps: https://www.epochconverter.com/ldap

DiscImageCreator also decodes the filestamps from DMI and SS, see outputScsiCmdLogforDVD.cpp
and from XDVDFS: execScsiCmdforFileSystem.cpp

Example from http://redump.org/disc/6024/:

DMI:
2005/03/30 20:54:46

SS:
Timestamp of authoring: 2005/03/29 21:07:14
Timestamp of unknown: 2005/03/29 18:38:08

volDesc:
Image creation time: 2005/03/30 02:38:16

I guess it's strange that the image creation date is later than the other timestamps. But this would give a time range of ~8 hours that we could try for brute forcing (if this is even possible).

first type seed is only 32bit, 256^4 combinations

second type seed is 128bit, 256^16 combinations, impossible to bruteforce, forever