* ExpectedServerSignType, ExpectedClientSignType - the expected
signature type used by server or client when signing messages
+* ExpectedClientCANames - for client auth list of CA names the server must
+ send. If this is "empty" the list is expected to be empty otherwise it
+ is a file of certificates whose subject names form the list.
+
## Configuring the client and server
The client and server configurations can be any valid `SSL_CTX`