linux-kernel - Re: [PATCH 1/2] crypto: sm3 - add a new alias name sm3-256

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Date:   Mon, 10 Feb 2020 11:30:26 -0500
From:   Ken Goldman <kgold@...ux.ibm.com>
To:     Eric Biggers <ebiggers@...nel.org>,
        Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        zohar@...ux.ibm.com, dmitry.kasatkin@...il.com, jmorris@...ei.org,
        serge@...lyn.com, linux-crypto@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] crypto: sm3 - add a new alias name sm3-256

On 2/9/2020 10:17 PM, Eric Biggers wrote:
> According to https://tools.ietf.org/id/draft-oscca-cfrg-sm3-01.html,
> SM3 always produces a 256-bit hash value.  E.g., it says:
> 
> 	"SM3 produces an output hash value of 256 bits long"
> 
> and
> 
> 	"SM3 is a hash function that generates a 256-bit hash value."
> 
> I don't see any mention of "SM3-256".
> 
> So why not just keep it as "sm3" and change hash_info.c instead?
> Since the name there is currently wrong, no one can be using it yet.

Question:  Is 256 bits fundamental to SM3?  Could there ever be a 
variant in the future that's e.g., 512 bits?