[RFC PATCH] crypto: riscv: scalar accelerated GHASH

[Eric Biggers]

On Thu, Apr 17, 2025 at 04:42:46PM +0800, Qingfang Deng wrote:
> > I see. But do you have a particular configuration in mind? Does it
> > have scalar AES too? I looked into that a while ago but I was told
> > that nobody actually incorporates that. So what about these
> > extensions? Are they commonly implemented?
> 
> It's aes-generic.c (LUT-based) with accelerated GHASH.

That's an odd combination.  Normally accelerated AES and GHASH go together.
Presumably you're targeting some specific RISC-V CPU.  Is this going to be a
one-off thing for that specific CPU?  Or can we expect many RISC-V CPUs to have
GHASH acceleration without AES?  And if so, why?

- Eric