request implement ssl/tls layer about simba

[eerimoq]

I created a file inet/ssl.h with a few functions to initialize, read and write data over SSL/TLS.

The Python SSL module looks nice at a glance, with the client example client-side and server example server-side.

I don't have any experiance using SSL/TLS libraries. Seems like mbedTLS is popular. What alternatives are free and open source? Feel free to make changes to inet/ssl.h and add more files for SSL.

I guess the ssl instance should be a channel, since SSL is a data transport protocol (with some security on top).

[eerimoq]

Added basic client and server examples in a test suite to better understand how to use the SSL module interface.

Note that the TCP socket must be connected to the remote peer before wrapping it in an SSL socket. That is, the SSL socket will not know if it transfers data on a TCP socket. It could be any channel.

[eerimoq]

The plan is to design the interface close to the Python ssl module interface.

[wuwx]

https://github.com/espressif/esp8266-rtos-sample-code/tree/master/04Protocal/SSL_Demo

esp8266 rtos ssl demo project

[eerimoq]

I can successfully send and receive data between an SSL server side socket on an ESP32 and my PC! Needs tuning of memory usage and, most importantly, a valid entropy source implementation to ensure(?) secure communication.

See the example for usage.

[eerimoq]

The first version is pushed and released. Let me know if there are issues or features that are missing. Only server side is implemented.

[eerimoq]

Both client and server side has been implemented and seems to work. Ther eare still functionality missing that should be added to make the security better, like verify the hostnames.