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The FSMs that drive the encryption logic are not performance critical, but they are very large. Build BearSSL using -Os on them, leaving -O2 everywhere else (i.e. encryption) for speed. Saves 1-2KB of flash for SSL applications.
BearSSL ESP8266 builder
This directory contains the git submodule for the ESP8266 ported bearssl low-level library, a port of BearSSL
If you are only working on the BearSSL:: namespace functions in the
Arduino ESP8266WiFi library (BearSSL::WiFiClientSecure,
BearSSL::WiFiServerSecure, etc.) you do NOT need to work in this
directory.
Normal users can simply use the libbearssl.a file already included in
the Arduino repo. Experienced users looking to work on the underlying
BearSSL-ESP8266 ported library can use this directory to automate the
build flow.
Prerequisites
The tools directory needs to be populated (i.e. Arduino IDE should be able
to compile an executable probect. get.py should ensure this).
UNIX-like system (Linux, Mac):
If you need to change the *.t0 (Forth-like language) you will need a
.NET-compatible runtime (such as mono under Linux) to rebuild the
resulant .c files.
For Windows (untested)
Microsoft's .NET runtime must be installed to run the .t0->.c workflow.
Building
make all: Init the submodule, if needed, then build but do not install the librarymake install: Init the submodule, if needed, then build and copy the library to the standard location intools/sdk/lib
Editing the library
https://github.com/earlephilhower/bearssl-esp8266 is the current repository
for this library. A git remote to the original BearSSL sources from
https://bearssl.org/git/BearSSL is added on submodule init. You can either
manually do pulls, or make merge-upstream to bring in any BearSSL upstream
changes.
Documentation in the library README-esp8266 and git log describes the changes done.
Feel free to drop me a line at earlephilhower@yahoo.com if you have questions.
-Earle F. Philhower, III