tls12

Partially implemented TLS 1.2.

Implement a part of the handshake to get information about the server.

Relevant RFC: RFC 5246

Errors silenced

readServerResponse()

• Timeout while reading response.
• Some server send RST (TCP Reset) inmediately after Alert(Handshake Failure) at the initial handshake. This causing a connection reset by peer error. But if the response is exactly 7 byte, the handshake was OK, but SSLv3 is not supported.

getSupportedCiphers()

• Some server respond an RST without Alert(Handshake Failure) when checking only one cipher. This means that the cipher is not supported.