linux-kernel - Re: [PATCH] net/tls: support SM4 CCM algorithm

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Date:   Thu, 30 Sep 2021 11:34:33 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Vadim Fedorenko <vfedorenko@...ek.ru>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Boris Pismenny <borisp@...dia.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/tls: support SM4 CCM algorithm

Hi Vadim,

On 9/29/21 5:24 AM, Vadim Fedorenko wrote:
> On 28.09.2021 07:28, Tianjia Zhang wrote:
>> The IV of CCM mode has special requirements, this patch supports CCM
>> mode of SM4 algorithm.
>>
> Have you tried to connect this implementation to application with
> user-space implementation of CCM mode? I wonder just because I have an
> issue with AES-CCM Kernel TLS implementation when it's connected to
> OpenSSL-driven server, but still have no time to fix it correctly.

I did not encounter any issue when using KTLS with AES-CCM algorithm, 
but the KTLS RX mode on the OpenSSL side does not seem to be supported.

I encountered some problems when using the SM4-CCM algorithm of KTLS. 
Follow the RFC8998 specification, the handshake has been successful, and 
the first data transmission can be successful. After that, I will 
encounter the problem of MAC verification failure, but this is issue on 
the OpenSSL side. because the problem is still being investigated, I 
have not opened the code for the time being.

Cheers,
Tianjia