mbed TLS (formerly known as PolarSSL) makes it trivially easy for
developers to include cryptographic and SSL/TLS capabilities in
their (embedded) products, facilitating this functionality with a
minimal coding footprint.

This contains major version 4 of the library, which is not backwards
compatible to version 2 or 3.

Homepage:
https://github.com/Mbed-TLS/mbedtls
