#asahi-dev on 2022-04-29 — irc logs at oftc.irclog.whitequark.org

2022-03-22 11:58 ChanServ changed the topic of #asahi-dev to: Asahi Linux: porting Linux to Apple Silicon macs | General development | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-dev

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17:15 <sven> i somehow got curious about that aes engine, can anyone run this test and paste the results somewhere? https://f.svpe.de/4fda9a85379eecdf4e53140607a54b828404c1174c65013579364e7e3ed88a97_aes.py

17:15 <sven> m1 mini results in this https://f.svpe.de/baf349300264335f2b5605096161113d1b649270c5b1603e162e2b336797bd17_aes_m1_mini_sven.txt

17:15 <sven> i'm mostly curious which of the hardware keys are the same

17:18 <sven> looks like it can do ~100-140 MiB/s while the arm64 aes instructions are ~850 MiB/s without cpufreq so it's probably useless for us anyway

17:55 <jannau> sven: https://www.jannau.net/aes/ key 1 differs and key 3 is identical on my mini, m1 max has different keys

17:57 <sven> ok, so i guess key 1 is different for each chip then and key 3 is global for a chip family

17:59 <sven> key 2 is probably the one that encrypts iboot and disabled and >=4 probably unused

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18:01 <sven> or maybe I got the key mask wrong but it didn’t do anything when I set bits above 3 (which should be key = 0 if the field is only 2 bits) and tried to program a key afterwards

18:02 <jannau> seems to apply. key 3 is the same on the m1 max and the 1st die of the m1 ultra

18:04 <sven> you got quite a nice collection of m1s there :-)

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20:45 <sven> jannau: found a key mangling function, can you try https://f.svpe.de/fe9bcf76d99ae223291fed90ef989780f8cd996f230765dc17c916e797fbcd33_aes.py and compare that with https://f.svpe.de/77d516175c5d2344c3695ad04cf2bc00899599028460de068c73f6eacd43c1c9_aes_m1_mini_sven2.txt?

20:48 <sven> ... and ofc there's a off-by-one error, that thing actually has three separate key mangling functions

20:49 <sven> https://f.svpe.de/2222bacbad4e7ca44043bc1cfaaefa940ac04aa56c984cc5a1874b25903295f4_aes_m1_mini_sven2_fixed.txt / https://f.svpe.de/19dc117acc2def2fd4dad1dd2aac877d94cd09f2d8b7eb65a4e4a3e1ef22e275_aes.py

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