How to use CC310 ChaChaPoly with zero-length data or adata?

RE: How to use CC310 ChaChaPoly with zero-length data or adata?

Einar Thorsrud — Fri, 06 Mar 2020 14:19:55 GMT

Hi,

It does not seem like it is supported yet, but I have bumped the internal feature request. You should probably not expect an update soon, though.

RE: How to use CC310 ChaChaPoly with zero-length data or adata?

Dirbaio — Fri, 06 Mar 2020 02:37:27 GMT

Hello! Any updates on this? As it stands now, this is a non-starter to use CC310 to implement WireGuard, because the protocol itself requires zero-length data and adata.

RE: How to use CC310 ChaChaPoly with zero-length data or adata?

Dirbaio — Tue, 29 Jan 2019 13:58:01 GMT

Yes, the issue is with CRYS_CHACHA_POLY.

It'd be great if this was supported. I understand that it's ARM IP (not Nordic) so that might make things more complicated...

Thanks! :)

RE: How to use CC310 ChaChaPoly with zero-length data or adata?

Einar Thorsrud — Tue, 29 Jan 2019 13:01:55 GMT

Hi,

I assume you are referring to the CRYS_CHACHA_POLY() function? You are right that this does not allow you to use zero data or adata. I have created an internal ticket so that this can be investigated. You should not expect any updates soon though, and it might not be possible.