Messages in this thread | | | Subject | Re: [PATCH] net/tls: support SM4 CCM algorithm | From | Vadim Fedorenko <> | Date | Thu, 30 Sep 2021 23:56:13 +0100 |
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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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