linux-kernel - Re: [RFC PATCH 4.10 1/6] crypto/sha256: Refactor the API so it can be used without shash

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Message-ID: <CALCETrXy6QXLKTih9e=ceMZes=SjHEMGg+vW1sXdiRg5Qaxt7g@mail.gmail.com>
Date:   Tue, 27 Dec 2016 11:00:17 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Biggers <ebiggers3@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC PATCH 4.10 1/6] crypto/sha256: Refactor the API so it can be
 used without shash

On Tue, Dec 27, 2016 at 6:16 AM, Daniel Borkmann <daniel@...earbox.net> wrote:
> On 12/27/2016 10:58 AM, Herbert Xu wrote:
>>
>> On Mon, Dec 26, 2016 at 10:08:48AM -0800, Andy Lutomirski wrote:
>>>
>>>
>>> According to Daniel, the networking folks want to let embedded systems
>>> include BPF without requiring the crypto core.
>>
>>
>> Last I checked the IPv4 stack depended on the crypto API so this
>> sounds bogus.
>
>
> I think there's a bit of a mixup here with what I said. To clarify,
> requirement back then from tracing folks was that bpf engine and
> therefore bpf syscall can be build w/o networking enabled for small
> devices, so dependencies preferably need to be kept on a absolute
> minimum, same counts for either making it suddenly a depend on
> CRYPTO or a select CRYPTO for just those few lines that can be
> pulled in from lib/ code instead.

Somehow I had that in my head as "networking" not "tracing", probably
because of the TCA stuff.  Whoops.

Anyway, I'm rewriting the crypto part of the patch completely based on
Ard's feedback.