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    use std::convert::From;
    use std::error::Error;
    use std::fmt;
    use std::io;

    pub type ConnectionResult<T> = Result<T, ConnectionError>;

    #[derive(Debug)]
    pub enum ConnectionError {
        IoError(io::Error),
        ProtocolError,
        NegotiationError,
        KeyExchangeError,
        KeyGenerationError,
        IntegrityError,
    }

    impl fmt::Display for ConnectionError {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            write!(f, "connection error: {}", (self as &Error).description())
        }
    }

    impl Error for ConnectionError {
        fn description(&self) -> &str {
            use self::ConnectionError::*;
            match self
            {
                &IoError(_) => "io error",
                &ProtocolError => "protocol error",
                &NegotiationError => "negotiation error",
                &KeyExchangeError => "key exchange error",
                &KeyGenerationError => "key generation error",
                &IntegrityError => "integrity error",
            }
        }
    }

    impl From<io::Error> for ConnectionError {
        fn from(err: io::Error) -> ConnectionError {
            ConnectionError::IoError(err)
        }
    }

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