marcan changed the topic of #asahi-re to: Asahi Linux: porting Linux to Apple Silicon macs | Hardware / boot process / firmware interface reverse engineering | WARNING: this channel (only) may contain binary reverse engineering discussion | RE policy: https://alx.sh/re (MANDATORY READ) | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-re
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<Shiz> bleh, spent like 30 mins reversing some compression until I realised it was just LZVN
<roxfan> bvx2 didn't ring a bell?
<Shiz> it didn't use the lzfse headers :)
<Shiz> just raw LZVN
<roxfan> at least it wasn't 30 hours
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<Shiz> i was like "this definitely is some kind of LZ-variant" and had a bunch of commands mapped out already until it dawned on me to search for "apple compression algorithm"
<Shiz> (that's not LZFSE)
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<roxfan> what are you unpacking if not kernelcache?
<Shiz> one of the nvram parameters is LZVN-compressed
<Shiz> a LZVN-compressed binary plist, to be exact
<roxfan> ah
<roxfan> weird that they didn't wrap it in img4 or something ;)
<marcan> Shiz: are you messing with img4?
<Shiz> not right now
<Shiz> why?
<marcan> don't they use the same compression? :)
<Shiz> ah yeah, but they use the proper LZFSE headers around it :P
<Shiz> (afaik)
<Shiz> although last I checked my img4 decoder balked on decompression sometimes so I def should double check that
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