SSL engine is closed *
gives decrypted data from the network *
During handshake contains data to be sent to other party.
During handshake contains data to be sent to other party. Decrypted data will be available after handshake completes with more successful reads to occur from the remote party.
Data to be sent back to network, during handshake. If empty, user must perform another read, before handshake's next step is to be completed and data shall be send to remote side.
When nonempty, shall be consulted to obtain next step in the handshake process