Aarch 64 version

[bkmgit]

Am examining this on Aarch 64. Would it be helpful to have a separate branch using sse2neon or have sse2neon supported in the main branch? Codes could also be kept separate, but having them in one place may ease comparison, especially if other vector extensions are added.

[yumi-sakemi]

I'm so sorry for late reply.

Thank you for your feedback!
We are currently preparing the NEON implementation of AREION based on the following paper.

https://eprint.iacr.org/2023/794

We plan to release the NEON version soon, so please give it a try once it's available!