the directory for certs, private key and openssl.cnf exclusively.
o Reworked BIO networking library, with full support for IPv6.
o New "unified" build system
+ o New security levels
+ o Support for scrypt algorithm
+ o Support for X25519
+ o Extended SSL_CONF support using configuration files
+ o KDF algorithm support. Implement TLS PRF as a KDF.
Major changes between OpenSSL 1.0.2f and OpenSSL 1.0.2g [1 Mar 2016]