public static void HandleKeyData(StsSession session, ClientKeyDataMessage keyData)
{
session.KeyExchange.CalculateSecret(keyData.A);
byte[] key = session.KeyExchange.CalculateSessionKey();
if (!session.KeyExchange.VerifyClientEvidenceMessage(keyData.M1))
{
session.EnqueueMessageError(new ServerErrorMessage((int)ErrorCode.InvalidAccountNameOrPassword));
return;
}
byte[] M2 = session.KeyExchange.CalculateServerEvidenceMessage();
using (MemoryStream stream = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(stream))
{
writer.Write(M2.Length);
writer.Write(M2, 0, M2.Length);
session.EnqueueMessageOk(new ServerKeyDataMessage
{
KeyData = Convert.ToBase64String(stream.ToArray())
});
}
// enqueue new key to be set after next packet flush
session.InitialiseEncryption(key);
}
public static void HandleLoginStart(StsSession session, ClientLoginStartMessage loginStart)
{
session.EnqueueEvent(new TaskGenericEvent <Account>(AuthDatabase.GetAccountAsync(loginStart.LoginName),
account =>
{
if (account == null)
{
session.EnqueueMessageError(new ServerErrorMessage((int)ErrorCode.InvalidAccountNameOrPassword));
return;
}
session.Account = account;
byte[] s = account.S.ToByteArray();
byte[] v = account.V.ToByteArray();
session.KeyExchange = new Srp6Provider(account.Email, s, v);
byte[] B = session.KeyExchange.GenerateServerCredentials();
using (MemoryStream stream = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(stream))
{
writer.Write(s.Length);
writer.Write(s, 0, s.Length);
writer.Write(B.Length);
writer.Write(B, 0, B.Length);
session.EnqueueMessageOk(new ServerLoginStartMessage
{
KeyData = Convert.ToBase64String(stream.ToArray())
});
}
session.State = SessionState.LoginStart;
}));
}
