mbedTLS

Mbed TLS is a C library that implements cryptographic primitives, X.509 certificate manipulation and the SSL/TLS and DTLS protocols. Its small code footprint makes it suitable for embedded systems.

NOTE: this package uses a custom configuration to make the library smaller, more performant and potentially more secure. Noteworthy things that are disabled are PSA, SHA384, PSK support and DTLS (encrypted UDP).  
If one of these configurations breaks your app let us know, so we can enable it again.

Look at the .spec file to find which things are disabled exactly.