saved key context file compatibility with go-tpm

[salrashid123]

hi-

i'm considering writing a very basic external utility in go which helps convert atleast a key context file between tpm2_tools and go-tpm

The context file which go saves is more ore less raw

• TPMSContext
• ContextSave

while tpm2_tools is a struct with a header, additional fields and esys metadata at the end.

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i managed to spend a fair amount of hrs spelunking around the code and docs and atleast came up with some way to do this only for a key.

https://github.com/salrashid123/tpm2/tree/master/tpm2_tools_load_ctx#tpm2_tools----go-tpm

a conversion utility probably certainly doen't fit into this repo nor go-tpm but if the byte gymnastics is the best/only way about it, i can start with just key converson alone. any thoughts would be great

ref

google/go-tpm#378

[AndreasFuchsTPM]

Feel free to add a PR to put this tool here:
https://github.com/tpm2-software/tpm2-tools/tree/master/tools/misc