Determining the crypto library to be used
Starting with OpenVPN 2.3, it became possible to build OpenVPN using either the OpenSSL cryptographic library or the PolarSSL library. The PolarSSL library is nowadays known as "mbedTLS". The PolarSSL library is used in the OpenVPN Connect apps for both Android and iOS, but the library can be used on all other supported platforms as well.
The goal of this recipe is to show how to determine which cryptographic library is used, including the run-time version number.
Getting ready
Set up the server certificate using the first recipe from Chapter 2, Client-server IP-only Networks. Use the client certificate and the intermediary CA certificate from the previous recipe. For this recipe, the computer was running Fedora 22 Linux and OpenVPN 2.3.10, built both for OpenSSL and for PolarSSL. Keep the server configuration file basic-udp-server.conf from the Server-side routing recipe in Chapter 2, Client-server IP-only Networks.
How to do it...
Start the regular...
