linux-kernel - Re: [PATCH 0/2] ecdsa: Use ecc_digits_from

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Message-Id: <D1MPWI6C2ZCW.F08I9ILD63L4@kernel.org>
Date: Thu, 30 May 2024 08:08:22 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Stefan Berger" <stefanb@...ux.ibm.com>, <keyrings@...r.kernel.org>,
 <linux-crypto@...r.kernel.org>, <herbert@...dor.apana.org.au>,
 <davem@...emloft.net>
Cc: <linux-kernel@...r.kernel.org>, <lukas@...ner.de>
Subject: Re: [PATCH 0/2] ecdsa: Use ecc_digits_from_bytes to simplify code

On Thu May 30, 2024 at 2:08 AM EEST, Stefan Berger wrote:
> Simplify two functions that were using temporary byte arrays for
> converting too-short input byte arrays to digits. Use ecc_digits_from_bytes
> since this function can now handle an input byte array that provides
> less bytes than what a coordinate of a curve requires - the function
> provides zeros for the missing (leading) bytes.
>
> See: c6ab5c915da4 ("crypto: ecc - Prevent ecc_digits_from_bytes from reading too many bytes")
>
> Regards,
>    Stefan
>
> Stefan Berger (2):
>   crypto: ecdsa - Use ecc_digits_from_bytes to create hash digits array
>   crypto: ecdsa - Use ecc_digits_from_bytes to convert signature
>
>  crypto/ecdsa.c | 29 ++++++-----------------------
>  1 file changed, 6 insertions(+), 23 deletions(-)

BTW, would it make sense split ecdsa signature encoding to its own patch
in my next patch set version and name it ecdsa_* style and put it to
ecdsa.c?

Just asking this because the part should be the same same for any ECDSA
signature. It must scale also to all NIST variants before my patch set
can land.

BR, Jarkko