key_derivation: clarify fetching the cpu value · invoxiplaygames.uk/x360-research@29e59dd

my research and reverse engineering notes/utilities relating to the Xbox 360 (Mirrored from https://github.com/InvoxiPlayGames/x360-research)

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key_derivation: clarify fetching the cpu value

invoxiplaygames.uk 2 years ago 29e59dd0 b26f5ed4

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official-software

hypervisor

key_derivation.md

official-software/hypervisor/key_derivation.md

··· 20 20 within XeLL and libxenon applications from the 32-bit address `0x200250B8`. The expected 21 21 value on a regular Xbox 360 has a CRC32 of `0x4B17A409`. (Begins `81300D...`) 22 22 23 + *(Note: If reading from HV or libxenon context, you must make sure this value is fetched 24 + with an "ld" instruction, otherwise the system could lock up.)* 25 + 23 26 *(TODO: It'd be nice to find out what this value means, and what affects it.)* 24 27 25 28 The derivation process consists of calls to XeCryptHmacSha, with the aforementioned key