async Task SaveLoop()
{
var ct = _cts.Token;
var prevSession = default(Session);
while (!ct.IsCancellationRequested)
{
var session = _session.Get();
if (!ReferenceEquals(prevSession, session))
{
prevSession = session;
await _store.Save(_session.Get()).ConfigureAwait(false);
}
try
{
await Task.Delay(Period, ct).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
break;
}
}
await _store.Save(_session.Get()).ConfigureAwait(false);
}
public async Task Send(byte[] msg)
{
var session = _session.Get();
var plainText = BtHelpers.UsingMemBinWriter(bw =>
{
bw.Write(session.Salt);
bw.Write(session.Id);
bw.Write(msg);
var bs = bw.BaseStream;
var requiredPadding = (16 - (int)bs.Position % 16).Apply(x => x == 16 ? 0 : x);
var randomPadding = (Rnd.NextInt32() & 15) * 16;
var padding = 16 + requiredPadding + randomPadding;
bw.Write(Rnd.NextBytes(padding));
});
var authKey = session.AuthKey.Key.ToArrayUnsafe();
var msgKey = CalcMsgKey(authKey, plainText, true);
var aesKey = CalcAesKey(authKey, msgKey, true);
var cipherText = Aes.EncryptAES(aesKey, plainText);
await BtHelpers.UsingMemBinWriter(bw =>
{
bw.Write(session.AuthKey.KeyId);
bw.Write(msgKey);
bw.Write(cipherText);
}).Apply(_transport.Send);
}
public Y Get() => _var.Get().Apply(_mapper);