public static TLResponse Parse(byte[] bytes, byte[] authKey)
{
TLUtils.WriteLine("-------------------");
TLUtils.WriteLine("--Parse response --");
TLUtils.WriteLine("-------------------");
int position = 0;
var response = new TLResponse();
response.AuthKeyId = bytes.SubArray(0, 8);
TLUtils.WriteLine("AuthKeyId: " + BitConverter.ToString(response.AuthKeyId));
response.MessageKey = bytes.SubArray(8, 16);
TLUtils.WriteLine("MessageKey: " + BitConverter.ToString(response.MessageKey));
response.EncryptedData = bytes.SubArray(24, bytes.Length - 24);
//TLUtils.WriteLine("Encrypted data: " + BitConverter.ToString(response.Data));
var keyIV = Utils.GetDecryptKeyIV(authKey, response.MessageKey);
response.DecryptedData = Utils.AesIge(response.EncryptedData, keyIV.Item1, keyIV.Item2, false);
//TLUtils.WriteLine("Decrypted data: " + BitConverter.ToString(response.DecryptedData));
response.Salt = response.DecryptedData.SubArray(0, 8);
TLUtils.WriteLine("Salt: " + BitConverter.ToString(response.Salt));
response.SessionId = response.DecryptedData.SubArray(8, 8);
TLUtils.WriteLine("SessionId: " + BitConverter.ToString(response.SessionId));
position = 0;
response.MessageId = TLObject.GetObject <TLLong>(response.DecryptedData.SubArray(16, 8), ref position);
TLUtils.WriteLine("<-MESSAGEID: " + TLUtils.MessageIdString(response.MessageId));
position = 0;
response.SequenceNumber = TLObject.GetObject <TLInt>(response.DecryptedData.SubArray(24, 4), ref position);
TLUtils.WriteLine(" SEQUENCENUMBER: " + response.SequenceNumber);
response.MessageLength = BitConverter.ToInt32(response.DecryptedData.SubArray(28, 4), 0);
TLUtils.WriteLine("MessageLength: " + response.MessageLength);
response.MessageData = response.DecryptedData.SubArray(32, response.MessageLength);
TLUtils.WriteLine("MessageData: " + BitConverter.ToString(response.MessageData));
position = 0;
response.Data = TLObject.GetObject <TLObject>(response.MessageData, ref position);
return(response);
}
public static T OpenObjectFromMTProtoFile <T>(object syncRoot, string fileName)
where T : TLObject
{
try
{
lock (syncRoot)
{
using (var fileStream = FileUtils.GetLocalFileStreamForRead(fileName))
{
if (fileStream.Length > 0)
{
return(TLObject.GetObject <T>(fileStream));
}
}
}
}
catch (Exception e)
{
WriteLine("MTPROTO FILE ERROR: cannot read " + typeof(T) + " from file " + fileName, LogSeverity.Error);
WriteException(e);
}
return(default(T));
}
public static TLDecryptedMessageBase DecryptMessage(TLString data, TLEncryptedChat chat, out bool commitChat)
{
commitChat = false;
var bytes = data.Data;
var keyFingerprint = BitConverter.ToInt64(bytes, 0);
var msgKey = bytes.SubArray(8, 16);
var key = chat.Key.Data;
var keyHash = Utils.ComputeSHA1(key);
var calculatedKeyFingerprint = BitConverter.ToInt64(keyHash, keyHash.Length - 8);
if (keyFingerprint != calculatedKeyFingerprint)
{
var chat20 = chat as TLEncryptedChat20;
if (chat20 != null && chat20.PFS_Key != null)
{
var pfsKeyHash = Utils.ComputeSHA1(chat20.PFS_Key.Data);
var pfsKeyFingerprint = BitConverter.ToInt64(pfsKeyHash, pfsKeyHash.Length - 8);
if (pfsKeyFingerprint == keyFingerprint)
{
chat20.Key = chat20.PFS_Key;
chat20.PFS_Key = null;
chat20.PFS_KeyFingerprint = null;
chat20.PFS_A = null;
chat20.PFS_ExchangeId = null;
commitChat = true;
}
else
{
return(null);
}
}
else
{
return(null);
}
}
var x = 0;
var sha1_a = Utils.ComputeSHA1(Combine(msgKey, key.SubArray(x, 32)));
var sha1_b = Utils.ComputeSHA1(Combine(key.SubArray(32 + x, 16), msgKey, key.SubArray(48 + x, 16)));
var sha1_c = Utils.ComputeSHA1(Combine(key.SubArray(64 + x, 32), msgKey));
var sha1_d = Utils.ComputeSHA1(Combine(msgKey, key.SubArray(96 + x, 32)));
var aesKey = Combine(sha1_a.SubArray(0, 8), sha1_b.SubArray(8, 12), sha1_c.SubArray(4, 12));
var aesIV = Combine(sha1_a.SubArray(8, 12), sha1_b.SubArray(0, 8), sha1_c.SubArray(16, 4), sha1_d.SubArray(0, 8));
var encryptedBytes = bytes.SubArray(24, bytes.Length - 24);
var decryptedBytes = Utils.AesIge(encryptedBytes, aesKey, aesIV, false);
var length = BitConverter.ToInt32(decryptedBytes, 0);
if (length <= 0 || (4 + length) > decryptedBytes.Length)
{
return(null);
}
var calculatedMsgKey = Utils.ComputeSHA1(decryptedBytes.SubArray(0, 4 + length));
for (var i = 0; i < 16; i++)
{
if (msgKey[i] != calculatedMsgKey[i + 4])
{
return(null);
}
}
var position = 4;
var decryptedObject = TLObject.GetObject <TLObject>(decryptedBytes, ref position);
var decryptedMessageLayer = decryptedObject as TLDecryptedMessageLayer;
var decryptedMessageLayer17 = decryptedObject as TLDecryptedMessageLayer17;
TLDecryptedMessageBase decryptedMessage = null;
if (decryptedMessageLayer17 != null)
{
decryptedMessage = decryptedMessageLayer17.Message;
var decryptedMessage17 = decryptedMessage as ISeqNo;
if (decryptedMessage17 != null)
{
decryptedMessage17.InSeqNo = decryptedMessageLayer17.InSeqNo;
decryptedMessage17.OutSeqNo = decryptedMessageLayer17.OutSeqNo;
}
}
else if (decryptedMessageLayer != null)
{
decryptedMessage = decryptedMessageLayer.Message;
}
else if (decryptedObject is TLDecryptedMessageBase)
{
decryptedMessage = (TLDecryptedMessageBase)decryptedObject;
}
return(decryptedMessage);
}
