Dear Madam/Sir,

            We are working on a project which requires IEC 62351 standards. For that we had developed a TLS server in C language and we had the requirement of developing a TLS client in Java language. We had used the mbedTLS library for server  and OpenMUC libraries for client. But we are getting exception while certificate exchange phase and all. We had attached the listed exceptions and errors. Kindly provide necessary support for the same. Also please confirm whether we can develop above specified architecture, ie TLS based server in C language and client in Java. If available please share some sample programs also. Please reply ASAP.

We have debugged the code and the following are the messages we have got in mbedtls java server and OPENMUC java tls client . During certificate exchange from client to server (MBEDTLS_SSL_CLIENT_CERTIFICATE case in server), the function returns a nonzero value  and the alert shows in server is 49  (ie, MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED). Please check Fig 1 and Fig 2 for the messages displayed during  connection   establishment.Kindly help us to solve the issues.

image.png


Fig 1- case:MBEDTLS_SSL_CLIENT_CERTIFICATE fails

image.png


Fig 2-OPENMUC java client error when connecting to mbedtlsserver

 


On Thu, Oct 21, 2021 at 6:52 PM Dave Rodgman via Mbed-tls-announce via mbed-tls <mbed-tls@lists.trustedfirmware.org> wrote:
Hi,

I would like to announce the Mbed TLS Tech Forum, a regular engineering call to discuss topics of interest to the Mbed TLS community.

The call is currently planned to take place every two weeks, alternating between US-friendly and China-friendly times (16:30 and 10:00 UK time), starting on the 25th October at 16:30 BST.

Please reply to the list if you have any agenda topics to raise. As a starting point, we will cover:

Format – check if times & cadence are suitable
TLS 1.3 – high-level update on progress & direction
PSA Cryptoprocessor Driver Interface – code generation for driver dispatch as per https://github.com/ARMmbed/mbedtls/pull/5067

Zoom details below. The call will be recorded and made available on the TF website: https://www.trustedfirmware.org/meetings/

Dave Rodgman
Mbed TLS tech lead

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