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SubjectRe: [PATCH] net/tls: support SM4 CCM algorithm
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On 30.09.2021 04:34, Tianjia Zhang wrote:
> 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.
>
Are you sure that this is an issue on the OpenSSL side? Because absolutely the
same problem is reported for AES-CCM algo and only when it's offloaded to
kernel. Looks like encryption of CCM could be broken somehow.

I will try to investigate it a bit later from the AES-CCM side.

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