/// <summary>
/// Attempts to establish the connection with the remote server
/// </summary>
private void Connect()
{
const int BUF_SZ = 65536;
_conn = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
_conn.ReceiveBufferSize = BUF_SZ;
_conn.SendBufferSize = BUF_SZ;
//establish a socket connection
_conn.Connect(_hostName, _port);
//read the auth challenge packet to be sent by the server
AuthChallenge challenge = new AuthChallenge(_conn);
//construct and send a response
AuthResponse response = new AuthResponse(challenge, _password);
response.Send(_conn);
//check our status
AuthStatus status = new AuthStatus(_conn);
if (status.Status != AuthStatus.StatusType.AS_SUCCESS)
{
throw new AuthException("Authentication failed, bad password");
}
}
/// <summary>
/// Constructs a new authentication response
/// </summary>
/// <param name="challenge">The challenge from the server</param>
/// <param name="password">The password for the server</param>
public AuthResponse(AuthChallenge challenge, string password)
{
//convert the password to ascii
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] asciiPW = encoding.GetBytes(password);
//get data from the challenge
byte[] challengeBytes = challenge.Challenge;
//add the two ranges together and compute the hash
AppendableByteArray authString = new AppendableByteArray(asciiPW.Length + challengeBytes.Length);
authString.Append(asciiPW);
authString.Append(challengeBytes);
SHA1 sha = new SHA1CryptoServiceProvider();
byte[] challengeHash = sha.ComputeHash(authString.data);
//copy the results to the raw packet data
_rawMessageData.Append(PACKET_IDENTIFIER);
_rawMessageData.Append(encoding.GetBytes(Util.HashToHex(challengeHash)));
}