Home World Forum: Stars! Extensions » Detecting corrupt race files

Home » Stars! Clones, Extensions, Modding » Stars! Extensions » Detecting corrupt race files

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Detecting corrupt race files

Tue, 14 July 2020 05:38

russl5445

Crewman 3rd Class

Messages: 5
Registered: September 2008
Location: Tucson, AZ

I've been banging my head against the checksum value in the Footer for a bit now...have you made any progress on it yourself?

Looks to me like:
- Checksum is calculated over the cleartext data (not the encrypted version)
- Footer stores the checksum in cleartext
- Agree, it appears to be XOR-related (a one-bit change in the cleartext causes a one-bit change in the Footer)

But I haven't been able to figure out exactly what the algorithm is. I've been calculating checksums on the blocks of the standard races (since that eliminates any possibility of differences in the file length or section header metadata, but the pattern isn't obvious to me yet.

Report message to a moderator

[Message index]

		Detecting corrupt race files By: ricks03 on Sun, 17 February 2019 23:58
		Re: Detecting corrupt race files By: raptor on Mon, 18 February 2019 14:37
		Re: Detecting corrupt race files By: ricks03 on Mon, 18 February 2019 15:01
		Re: Detecting corrupt race files By: raptor on Mon, 18 February 2019 16:39
		Re: Detecting corrupt race files By: craebild on Tue, 19 February 2019 12:08
		Re: Detecting corrupt race files By: ricks03 on Tue, 19 February 2019 13:17
		Re: Detecting corrupt race files By: raptor on Tue, 19 February 2019 18:32
		Re: Detecting corrupt race files By: ricks03 on Wed, 20 February 2019 00:19
		Re: Detecting corrupt race files By: raptor on Wed, 20 February 2019 09:12
		Re: Detecting corrupt race files By: ricks03 on Wed, 20 February 2019 12:30
		Re: Detecting corrupt race files By: raptor on Wed, 20 February 2019 10:04
		Re: Detecting corrupt race files By: ricks03 on Mon, 16 November 2020 02:51
		Re: Detecting corrupt race files By: ricks03 on Wed, 20 February 2019 12:37
		Re: Detecting corrupt race files By: raptor on Fri, 22 February 2019 10:59
		Re: Detecting corrupt race files By: raptor on Sun, 24 February 2019 17:42
		Re: Detecting corrupt race files By: ricks03 on Sun, 24 February 2019 22:59
		Re: Detecting corrupt race files By: russl5445 on Tue, 14 July 2020 05:38
		Re: Detecting corrupt race files By: raptor on Tue, 14 July 2020 09:14
		Re: Detecting corrupt race files By: russl5445 on Tue, 14 July 2020 11:45
		Re: Detecting corrupt race files By: russl5445 on Tue, 14 July 2020 13:40
		Re: Detecting corrupt race files By: ricks03 on Wed, 18 November 2020 23:58
		Re: Detecting corrupt race files By: ricks03 on Sat, 15 May 2021 02:34
		Re: Detecting corrupt race files By: ricks03 on Sat, 15 May 2021 02:44
		Re: Detecting corrupt race files By: ricks03 on Sat, 15 May 2021 12:10
		Re: Detecting corrupt race files By: ricks03 on Sat, 15 May 2021 12:29
		Re: Detecting corrupt race files By: ricks03 on Sat, 15 May 2021 13:09
		Re: Detecting corrupt race files By: raptor on Sat, 15 May 2021 15:55
		Re: Detecting corrupt race files By: ricks03 on Sat, 15 May 2021 17:01
		Re: Detecting corrupt race files By: raptor on Wed, 27 February 2019 22:18
		Re: Detecting corrupt race files By: m.a@stars on Thu, 28 February 2019 22:33
		Re: Detecting corrupt race files By: ricks03 on Sat, 15 May 2021 14:21
		Re: Detecting corrupt race files By: raptor on Mon, 17 May 2021 11:57
		Re: Detecting corrupt race files By: ricks03 on Mon, 17 May 2021 12:03
		Re: Detecting corrupt race files By: raptor on Mon, 17 May 2021 12:37
		Re: Detecting corrupt race files By: ricks03 on Mon, 17 May 2021 12:50
		Re: Detecting corrupt race files By: raptor on Mon, 17 May 2021 12:57
		Re: Detecting corrupt race files By: ricks03 on Mon, 17 May 2021 13:08
		Re: Detecting corrupt race files By: ricks03 on Mon, 17 May 2021 14:02
		Re: Detecting corrupt race files By: ricks03 on Mon, 17 May 2021 14:20
		Re: Detecting corrupt race files By: ricks03 on Mon, 17 May 2021 15:32
		Re: Detecting corrupt race files By: ricks03 on Mon, 17 May 2021 18:32
		Re: Detecting corrupt race files By: raptor on Tue, 18 May 2021 00:41
		Re: Detecting corrupt race files By: ricks03 on Tue, 18 May 2021 01:22
		Re: Detecting corrupt race files By: raptor on Tue, 18 May 2021 10:07
		Re: Detecting corrupt race files By: raptor on Tue, 18 May 2021 18:00
		Re: Detecting corrupt race files By: ricks03 on Mon, 28 June 2021 15:44

Previous Topic:	Utility to reset Stars! passwords
Next Topic:	Utility to fix corrupt race files

Goto Forum:

-=] Back to Top [=-

Current Time: Fri May 03 10:31:10 EDT 2024