/// <summary>
/// Performs the handshake to the server and gets the version number of the protocol.
/// </summary>
/// <returns>The version of the protocol as string in format x.x.x</returns>
/// <param name="client">Connected network client holding the socket</param>
/// <param name="token">Cancellation Token.</param>
protected async Task <string> DoHandshake(IConnectedNetworkClient client, CancellationToken token)
{
Debug.WriteLine("[BaseCommand] - starting handshake");
await client.SendAsync(Protocol.HELLO, token);
string answer = await client.ReceiveAsync(token);
return(ValidateAnswer(answer));
}
protected async Task <byte[]> SendKey(IConnectedNetworkClient client, CancellationToken token)
{
Debug.WriteLine("[BaseCommand] - starting send key");
byte[] aesKey = _cryptoService.GetSha256Hash(_cryptoService.GetRandomString(512, token));
string crKey = _cryptoService.EncodeRSA(_settings.GetServerPublicKey(), aesKey);
string command = String.Format("{0}{1}{2}", Protocol.XCHANGEKEY, Protocol.SPLITTER, crKey);
await client.SendAsync(command, token);
string answer = await client.ReceiveAsync(token);
ValidateAnswer(answer);
return(aesKey);
}
protected override async Task <int> Run(string value = default(string), CancellationToken token = default(CancellationToken))
{
Debug.WriteLine("[Call] - running");
IConnectedNetworkClient client = null;
try {
var flashCommand = BuildFlashCommand();
client = await Connect(token);
var version = await DoHandshake(client, token);
Debug.WriteLine("Protocol version: {0}\ncommand: {1} ", version, flashCommand);
// todo call sendkey, check answer lrc
await client.SendAsync(flashCommand);
} finally {
if (client != null)
{
client.Close();
}
}
return(0);
}