linux-kernel - Re: [PATCH v4 0/4] Implement GCM ghash using Zbc and Zbkb extensions

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Message-ID: <20230426225550.GA65659@sol.localdomain>
Date:   Wed, 26 Apr 2023 15:55:50 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     palmer@...belt.com, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, herbert@...dor.apana.org.au,
        davem@...emloft.net, conor.dooley@...rochip.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, christoph.muellner@...ll.eu,
        Heiko Stuebner <heiko.stuebner@...ll.eu>
Subject: Re: [PATCH v4 0/4] Implement GCM ghash using Zbc and Zbkb extensions

Hi Heiko,

On Wed, Mar 29, 2023 at 04:06:38PM +0200, Heiko Stuebner wrote:
> From: Heiko Stuebner <heiko.stuebner@...ll.eu>
> 
> This was originally part of my vector crypto series, but was part
> of a separate openssl merge request implementing GCM ghash as using
> non-vector extensions.
> 
> As that pull-request
>     https://github.com/openssl/openssl/pull/20078
> got merged recently into openssl, we could also check if this could
> go into the kernel as well and provide a base for further accelerated
> cryptographic support.

One more question.  It seems that this patchset uses the RISC-V scalar crypto
extensions.  I've been hearing rumors that the RISC-V scalar crypto extensions
have been superseded by the vector crypto extensions.  Is that accurate?  I
wonder if it's worth putting effort into implementations that use the scalar
crypto extensions when they might already be obsolete.

- Eric