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GM 5 byte seed/key tool
Posted: Wed Mar 01, 2023 7:19 pm
by kur4o
Found a link with 5 byte seed/key generator. Seed needs to be valid and conforms to some unknown special rules, so you can`t just use random seed for testing.
https://universalpatcher.net/gm-5-byte-keys/
Re: GM 5 byte seed/key tool
Posted: Thu Mar 02, 2023 12:39 am
by ironduke
Just a quick review for anyone wondering, it works quite well for E92,E82,E78 and E39a...
Re: GM 5 byte seed/key tool
Posted: Thu Mar 02, 2023 2:56 am
by In-Tech
Wow, I missed this somehow. I will try it out. Thanks kur4o and ironduke
Re: GM 5 byte seed/key tool
Posted: Thu Mar 02, 2023 5:59 am
by Gatecrasher
The only rule I've been able to guess at so far is that SPS seeds need to end with either 01 or 06, and DVT seeds need to end with 0C.
I think I also read that if you feed it a seed of 11 11 11 11 11, you should get 55 55 55 55 55 for the key. Or maybe I've got that reverse. But it's supposed to be used for testing your code implementation.
Re: GM 5 byte seed/key tool
Posted: Fri Mar 03, 2023 12:19 am
by gmtech825
has anyone figured out the DVT algo?
Re: GM 5 byte seed/key tool
Posted: Fri Mar 03, 2023 6:23 am
by Gatecrasher
I suspect it's the same theory, but a different set of crypto values. This is a half wild guess, but I think the constant references to SA015BCR are "Security Access 01 5 Byte calc (crypto?) routine".
So there's probably a similar SA035BCR within GM for DVT functions.