Hello! It's been a while since I've done any write-ups, but I thought I'd do one to (hopefully) bring a little clarity to a situation that's been causing a lot of confusion and misinformation.
I'm thinking I'll go through what the problem is and why it happens. So, I guess, let's dive in:
Some people are finding that upon updating to 17.0.0, their consoles are getting a blackscreen and refusing to boot further.
Research by Grayson Martin
Last Updated 7/8/23
Value Added Services (VAS) is the protocol used by NFC capable passes in Apple Wallet. Access to this protocol is heavily restricted on both the device end (a special certificate issued by Apple is required to create these passes) and the reader end (NDA enforced confidentiality). As such, a desire arose to better understand the protocol in order to explore additional use cases and examine its cryptographic integrity. There are gaps in understanding in certain parts of this protocol, however this document contains the minimum necessary understanding to automatically select, read data from, and decrypt a pass.
Importantly, this specification does not enable a malicious actor to read the data from a pass for which they do not have both the reader's private key, and the pass type identifier. Imp
| # godot compressed file unpacker/repacker | |
| # i think this should Just Work(tm) for deflate and gzip assets | |
| # sucks for anyone who needs to mess with fastLZ/zstd assets (hopefully not me later) | |
| # works with like, python3.2 standard library (or thereabouts, i'm using 3.10) | |
| import math | |
| import os | |
| import struct | |
| import sys | |
| import zlib |
