The STM32F1xx should be capable of doing some forms of TLS.
There're a number of commercial TLS products that include this chip, although they're obviously C or C++ linker libraries.
There're also a number of Javascript projects which could be "gutted" to run on Espruino and either provide ad-hoc encryption over HTTP, or possibly even a lightweight, barebones TLS implementation (pick the most popular/least taxing cipher, for example):
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
The STM32F1xx should be capable of doing some forms of TLS.
There're a number of commercial TLS products that include this chip, although they're obviously C or C++ linker libraries.
There're also a number of Javascript projects which could be "gutted" to run on Espruino and either provide ad-hoc encryption over HTTP, or possibly even a lightweight, barebones TLS implementation (pick the most popular/least taxing cipher, for example):
I may have a crack at this, time depending.
-m