From: Eric Biggers <ebiggers@kernel.org>
To: 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: Sun, 9 Feb 2020 19:17:17 -0800 [thread overview]
Message-ID: <20200210031717.GA5198@sol.localdomain> (raw)
In-Reply-To: <20200207092219.115056-2-tianjia.zhang@linux.alibaba.com>
On Fri, Feb 07, 2020 at 05:22:18PM +0800, Tianjia Zhang wrote:
> The name sm3-256 is defined in hash_algo_name in hash_info, but the
> algorithm name implemented in sm3_generic.c is sm3, which will cause
> the sm3-256 algorithm to be not found in some application scenarios of
> the hash algorithm, and an ENOENT error will occur. For example,
> IMA, keys, and other subsystems that reference hash_algo_name cannot use
> the hash algorithm of sm3. This patch adds an alias name sm3-256 to sm3,
> which can better solve the above problems.
>
> Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
> ---
> crypto/sm3_generic.c | 21 +++++++++++++++++----
> 1 file changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/crypto/sm3_generic.c b/crypto/sm3_generic.c
> index 3468975215ca..ded41031bd5f 100644
> --- a/crypto/sm3_generic.c
> +++ b/crypto/sm3_generic.c
> @@ -163,7 +163,7 @@ int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
> }
> EXPORT_SYMBOL(crypto_sm3_finup);
>
> -static struct shash_alg sm3_alg = {
> +static struct shash_alg sm3_algs[2] = { {
> .digestsize = SM3_DIGEST_SIZE,
> .init = sm3_base_init,
> .update = crypto_sm3_update,
> @@ -176,16 +176,28 @@ static struct shash_alg sm3_alg = {
> .cra_blocksize = SM3_BLOCK_SIZE,
> .cra_module = THIS_MODULE,
> }
> -};
> +}, {
> + .digestsize = SM3_DIGEST_SIZE,
> + .init = sm3_base_init,
> + .update = crypto_sm3_update,
> + .final = sm3_final,
> + .finup = crypto_sm3_finup,
> + .descsize = sizeof(struct sm3_state),
> + .base = {
> + .cra_name = "sm3-256",
> + .cra_blocksize = SM3_BLOCK_SIZE,
> + .cra_module = THIS_MODULE,
> + }
> +} };
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.
- Eric
next prev parent reply other threads:[~2020-02-10 3:17 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 [this message]
[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
[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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