private async Task CreateChatResponse(EncryptedChatRequestedConstructor chat)
{
try {
messages_DhConfig dhConfig = await session.Api.messages_getDhConfig(version, 256);
byte[] randomSalt;
if (dhConfig.Constructor == Constructor.messages_dhConfig)
{
Messages_dhConfigConstructor conf = (Messages_dhConfigConstructor)dhConfig;
version = conf.version;
g = conf.g;
p = new BigInteger(1, conf.p);
randomSalt = conf.random;
}
else if (dhConfig.Constructor == Constructor.messages_dhConfigNotModified)
{
Messages_dhConfigNotModifiedConstructor conf = (Messages_dhConfigNotModifiedConstructor)dhConfig;
randomSalt = conf.random;
}
else
{
throw new InvalidDataException("invalid constructor");
}
byte[] b = GetSaltedRandomBytes(256, randomSalt, 0);
BigInteger bInt = new BigInteger(1, b);
byte[] gb = BigInteger.ValueOf(g).ModPow(bInt, p).ToByteArrayUnsigned();
byte[] key = new BigInteger(1, chat.g_a).ModPow(bInt, p).ToByteArrayUnsigned();
long fingerprint = CalculateKeyFingerprint(key);
EncryptedChat acceptedChat = await session.Api.messages_acceptEncryption(TL.inputEncryptedChat(chat.id, chat.access_hash), gb, fingerprint);
Deployment.Current.Dispatcher.BeginInvoke(() => {
var echats = from dialog in session.Dialogs.Model.Dialogs where dialog is DialogModelEncrypted && ((DialogModelEncrypted)dialog).Id == chat.id select dialog;
if (echats.Any())
{
// ???
}
else
{
session.Dialogs.Model.Dialogs.Insert(0, new DialogModelEncrypted(session, acceptedChat, key, fingerprint, b));
}
});
} catch (Exception e) {
logger.error("response create chat error: {0}", e);
}
}