From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Ken Goldman <kgold@linux.ibm.com>,
Eric Biggers <ebiggers@kernel.org>,
Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Cc: herbert@gondor.apana.org.au, davem@davemloft.net,
zohar@linux.ibm.com, dmitry.kasatkin@gmail.com,
jmorris@namei.org, serge@hallyn.com,
linux-crypto@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] crypto: sm3 - add a new alias name sm3-256
Date: Mon, 10 Feb 2020 08:39:37 -0800 [thread overview]
Message-ID: <1581352777.3526.17.camel@HansenPartnership.com> (raw)
In-Reply-To: <1a623251-e83a-3b70-9fbd-8e929a23f7d8@linux.ibm.com>
On Mon, 2020-02-10 at 11:30 -0500, Ken Goldman wrote:
> 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?
No.
> Could there ever be a
> variant in the future that's e.g., 512 bits?
Yes, SM3 like SHA-3 is based on a 512 bit input blocks. However,
what's left of the standard:
https://www.ietf.org/archive/id/draft-sca-cfrg-sm3-02.txt
Currently only defines a 256 output (via compression from the final 512
bit output). In theory, like SHA-3, SM3 could support 384 and 512
output variants. However, there's no evidence anyone is working on
adding this.
James
next prev parent reply other threads:[~2020-02-10 16:39 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-07 9:22 [PATCH] IMA hash algorithm supports sm3-256 Tianjia Zhang
2020-02-07 9:22 ` [PATCH 1/2] crypto: sm3 - add a new alias name sm3-256 Tianjia Zhang
2020-02-10 3:17 ` Eric Biggers
[not found] ` <b7ce247b-ede1-4b01-bb11-894c042679e1.tianjia.zhang@linux.alibaba.com>
2020-02-10 12:06 ` 回复：[PATCH " Tianjia Zhang
2020-02-10 16:30 ` [PATCH " Ken Goldman
2020-02-10 16:39 ` James Bottomley [this message]
[not found] ` <7a496bb15f264eab920bf081338d67af@MN2PR20MB2973.namprd20.prod.outlook.com>
2020-02-10 17:01 ` Van Leeuwen, Pascal
2020-02-10 17:39 ` Mimi Zohar
2020-02-10 18:02 ` Ken Goldman
2020-02-10 18:36 ` Eric Biggers
[not found] ` <3b21122352a44cb9a20030a32f07e38a@MN2PR20MB2973.namprd20.prod.outlook.com>
2020-02-11 7:56 ` Van Leeuwen, Pascal
2020-02-07 9:22 ` [PATCH 2/2] ima: add sm3-256 algorithm to hash algorithm configuration list Tianjia Zhang
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