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

[Tianjia Zhang]

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