How to make crypto lib available for user?

[Toyokomi]

Hello,
I am trying to use mbedTLS from MQTT-TLS on Xenon, but without luck. I was trying to connect to Google IoT Core via MQTT, but generating JWT is problem. When I finally manage to compile code, my code stucked into function:

mbedtls_pk_sign

( this could related to bad config etc.).
After some fights, a I think why can not we use mbedTLS lib? Lib is ported inside firmware, and as I assume ported well to all platforms. This will use less memory for binary and, we don't have to think about config.h file and other stuff related to it.
So my question is... How we can use crypto lib in user application? It is possible?

[bko]

Hi @Toyokomi

How are building your firmware for the Xenon? Local gcc build with the monolithic switch?

See this thread for details about why it is not easy to just link to the crypto libraries:

How to send Device's key to Private Server & vice-versa?

One other point I wanted to add to @rickkas7 excellent response: None of the Particle cloud crypto is unique. It just uses a standard crypto library in normal ways. The only impediment to you using that same library is that the functions are not brought into the hardware abstraction layer (HAL) that is the key to having small updates of user firmware without reflashing the entire Device OS every time. Basically you cannot link against the crypto functions without compiling a different way. I…

[Toyokomi]

I am building with Workbench. And building with gcc using makefiles. Yes I agree with some points. That way allows us to use less memory. I did not find explicit tutorial for building system.