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

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Message-ID: <YnJLBfONnbqZlv6j@zx2c4.com>
Date:   Wed, 4 May 2022 11:44:37 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Stafford Horne <shorne@...il.com>
Cc:     Mikulas Patocka <mpatocka@...hat.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>,
        Milan Broz <gmazyland@...il.com>
Subject: Re: [PATCH v2] hex2bin: make the function hex_to_bin constant-time

On Wed, May 04, 2022 at 11:42:27AM +0200, Jason A. Donenfeld wrote:
> (which might be semantically better anyway) and then
> let the function itself do the sign change (see below).
 
Actually, probably worse, not better. Didn't realize cu was being used
after the masking.