Originally posted by another user
EID crypto is very complicated, it is done so on purpose. first of all EID0 isn't decrypted with one key, and one
algorithm alone. it is decrypted in several parts which use different algos and keys. the keys are all derivations
of a per console key (per_console_key_1)which is stored inside metldr and copied by it to sector 0 and never
leaves isolation. that same key is a derivation of the per console key (per_console_key_0) used to encrypt metldr
and the bl in the first place as well.
This is alla just another way to exploit the metldr. I really doubt we have serious devs here but ya here ya go.