[aes] Connect EDN interface

[vogelpi]

This PR connects the entropy distribution network (EDN) interface of AES to a Trivium stream cipher primitive which can be reseeded by firmware. The stream cipher primitive is required to decouple AES from firmware as AES can repeatedly request fresh entropy via the EDN interface while doing encryptions/decryptions. This entropy is required for the internal masking SCA countermeasure.

[linux-foundation-easycla]

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• ✅ login: vogelpi / name: Pirmin Vogel (653b536, 15962fc)

[vogelpi]

Update: I've now reworked the firwmare interface as proposed @mojtaba-bisheh . There are now 9 distinct 32-bit registers that firmware writes to provide a new 288-bit seed for the Trivium stream cipher primitive.

[vogelpi]

Hi @mojtaba-bisheh
would you mind approving this please? IIUC this PR needs to be approved by you as well. On top of that, can you please provide some guidance to me and @andrea-caforio for pushing this over the finish line? I think this really needs to be merged before carving the next release.

[mojtaba-bisheh]

Hi @mojtaba-bisheh would you mind approving this please? IIUC this PR needs to be approved by you as well. On top of that, can you please provide some guidance to me and @andrea-caforio for pushing this over the finish line? I think this really needs to be merged before carving the next release.

We need to process it through our internal tools to verify it passes all tests. If you don’t have access to our pipeline, I can handle it for you.

[vogelpi]

Hi @mojtaba-bisheh , thanks for your feedback. I don't have access yet, if you could help that would be very much appreciated.

[mojtaba-bisheh]

Hi @mojtaba-bisheh , thanks for your feedback. I don't have access yet, if you could help that would be very much appreciated.

please merge main into this PR to resolve hash conflict. then, I will take care of it

[vogelpi]

Sorry @mojtaba-bisheh for asking: do you mean to rebase this on main? Can you please provide a list of commands? I am currently traveling and will need to hop on a plane soon.