linux-kernel - Re: [PATCH v2] hex2bin: make the function hex_to

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Message-ID: <CAHmME9roTbjorBTzJGqJjmu7fgE_8w4RV8Pnwkqnoa1V+0kahg@mail.gmail.com>
Date:   Wed, 4 May 2022 11:50:16 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Milan Broz <gmazyland@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Stafford Horne <shorne@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Shevchenko <andy@...nel.org>,
        device-mapper development <dm-devel@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Mike Snitzer <msnitzer@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: Re: [PATCH v2] hex2bin: make the function hex_to_bin constant-time

On Wed, May 4, 2022 at 11:47 AM Milan Broz <gmazyland@...il.com> wrote:
> BTW we use exactly the same code from Mikulas in cryptsetup now (actually the report
> was initiated from here :) and I added some tests for this code,
> you can probably adapt it (we just use generic wrapper around it):

I use something pretty similar in wireguard-tools:
https://git.zx2c4.com/wireguard-tools/tree/src/encoding.c#n74

The code is fine. This is looking like a different issue somewhere
else in the OpenRISC stack...