How to implement authorization using a Telegram API?
I have written a PHP implementation of mtproto, and so far I have managed to implement TL serialization/deserialization, tcp abridged/intermediate/full connections, http/https connections.
I have implemented OOP wrappers for all mtproto methods, a prime generation module based on Python/wolfram alpha/php, HTML/Markdown parsing with support for mentions, bot API file id support, update handling with callbacks or getupdates, bot API <-> MTProto object conversion, upload/download wrappers, login wrappers for bots/users (2FA is supported), simple error handling, internal peer management (you can provide a simple bot API chat id, a username or a peer id in tg-cli format to send a message or to call other mtproto methods) and I am currently working on a nice Lua wrapper to allow usage of td-cli/tg-cli bots w/ MadelineProto.
I have also written a class to generate documentation for all mtproto methods/constructors/types (available at https://daniil.it/MadelineProto/API_docs). MadelineProto can be serialized to a file to allow easy session storage.
If anyone is interested, or wants to contribute, here is the link to the github repo: https://github.com/danog/MadelineProto
As a follow up to my original post, once you are done with the auth_key steps the following will be useful to quickly get you up to speed with how the rest of telegram works.
1) Download and study the source code for Webogram, it is all basically JavaScript.
2) run a local copy of Webogram modified with console.logs to clearly show you step by step the interactions that are taking place between "a working telegram client" and the telegram servers. This will give you a work-flow of how telegram clients and Telegram really work.
3) Use whatever development language you are most comfortable with to build your own implementation of a Protocol Parser for converting binary streams into TL types and vice-versa
It's actually quite fun to code this step. I've just built a simple Protocol Parser in Elixir
4) Here is a sample log from a modified copy of Webogram.
It shows what steps to take after successfully generated your Auth_key
You even get to see where it has to generate a new Auth_key in-flight as it switches the validated your to the proper DataCenter, recreating his session, new server_salts etc (not shown)
Regards.
ID time info log
121 12:26:35.318 new Auth Auth successfull! dc= 2 mtproto.js:479:15
127 12:26:35.325 CALL =>> API call help.getNearestDc Object { } Object { dcID: 2, createNetworker: true } mtproto.js:749:4
128 12:26:35.327 enc-START [invokeWithLayer] 45 mtproto.js:753:7
168 12:26:35.551 SEND POST XHR http://149.154.167.51/apiw1 [HTTP/1.1 200 OK 708ms]
189 12:26:36.522 msg-r <<=m [msg_container] Object { _: "msg_container", messages: Array[2] } mtproto.js:1452:5
190 12:26:36.523 msg-r <<=m [message] Object { _: "message", msg_id: "6242200678614200321", seqno: 1, bytes: 28, body: Object } mtproto.js:1452:5
191 12:26:36.525 msg-r <<=m [new_session_created] Object { _: "new_session_created", first_msg_id: "6242200671500883244", unique_id: "645797764649391412", server_salt: "17212767594123551779" } mtproto.js:1452:5
192 12:26:36.526 msg-r <<=m [message] Object { _: "message", msg_id: "6242200678630513665", seqno: 3, bytes: 28, body: Object } mtproto.js:1452:5
193 12:26:36.528 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200671500883244", result: Object } mtproto.js:1452:5
257 12:26:39.239 new Auth Auth successfull! dc= 4 mtproto.js:479:15
270 12:26:59.606 CALL =>> API call auth.sendCode Object { phone_number: "2348022002298", sms_type: 5, api_id: 38665, api_hash: "880c7847a517fc455d7d54731e90ad4e", lang_code: "en-US" } Object { dcID: 2, createNetworker: true } mtproto.js:749:4
321 12:27:00.048 SEND POST XHR http://149.154.167.51/apiw1 [HTTP/1.1 200 OK 422ms]
328 12:27:00.981 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200779464550396", result: Object } mtproto.js:1452:5
331 12:27:00.986 CALL =>> API call auth.sendCode Object { phone_number: "2348022002298", sms_type: 5, api_id: 38665, api_hash: "880c7847a517fc455d7d54731e90ad4e", lang_code: "en-US" } Object { dcID: "4", createNetworker: true, resultType: "auth.SentCode", messageID: "6242200779464550396" } mtproto.js:749:4
332 12:27:00.987 enc-START [invokeWithLayer] 45 mtproto.js:753:7
377 12:27:01.288 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 321ms]
398 12:27:02.170 msg-r <<=m [msg_container] Object { _: "msg_container", messages: Array[2] } mtproto.js:1452:5
399 12:27:02.171 msg-r <<=m [message] Object { _: "message", msg_id: "6242200787684582401", seqno: 1, bytes: 28, body: Object } mtproto.js:1452:5
400 12:27:02.172 msg-r <<=m [new_session_created] Object { _: "new_session_created", first_msg_id: "6242200784556418516", unique_id: "13396961033572361155", server_salt: "7076519506215495914" } mtproto.js:1452:5
401 12:27:02.173 msg-r <<=m [message] Object { _: "message", msg_id: "6242200787775901697", seqno: 3, bytes: 48, body: Object } mtproto.js:1452:5
402 12:27:02.174 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200784556418516", result: Object } mtproto.js:1452:5
407 12:27:02.344 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 25154ms]
414 12:27:03.068 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200779464550396" } mtproto.js:1452:5
420 12:27:15.639 CALL =>> API call auth.sendSms Object { phone_number: "2348022002298", phone_code_hash: "696b5befd8e809de81" } Object { dcID: "4", createNetworker: true, resultType: "auth.SentCode", messageID: "6242200784556418516" } mtproto.js:749:4
468 12:27:15.924 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 457ms]
475 12:27:17.154 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200848242727644", result: true } mtproto.js:1452:5
482 12:27:27.511 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200848242727644" } mtproto.js:1452:5
505 12:27:31.003 SEND POST XHR http://149.154.167.51/apiw1 [HTTP/1.1 200 OK 25161ms]
511 12:27:40.133 CALL =>> API call auth.signIn Object { phone_number: "2348022002298", phone_code_hash: "696b5befd8e809de81", phone_code: "26914" } Object { dcID: "4", createNetworker: true, resultType: "Bool", messageID: "6242200848242727644" } mtproto.js:749:4
560 12:27:40.454 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 756ms]
567 12:27:41.223 msg-r <<=m [msg_container] Object { _: "msg_container", messages: Array[2] } mtproto.js:1452:5
568 12:27:41.224 msg-r <<=m [message] Object { _: "message", msg_id: "6242200956100910081", seqno: 7, bytes: 80, body: Object } mtproto.js:1452:5
569 12:27:41.225 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200954555850604", result: Object } mtproto.js:1452:5
570 12:27:41.226 msg-r <<=m [message] Object { _: "message", msg_id: "6242200956751929345", seqno: 9, bytes: 88, body: Object } mtproto.js:1452:5
571 12:27:41.227 msg-r <<=m [updates] Object { _: "updates", updates: Array[1], users: Array[0], chats: Array[0], date: 1453375666, seq: 2 } mtproto.js:1452:5
579 12:27:41.758 CALL =>> API call updates.getState Object { } Object { noErrorBox: true } mtproto.js:749:4
586 12:27:41.842 CALL =>> API call account.updateStatus Object { offline: false } Object { noErrorBox: true } mtproto.js:749:4
594 12:27:41.850 CALL =>> API call messages.getDialogs Object { offset_date: 0, offset_id: 0, offset_peer: Object, limit: 20 } Object { timeout: 300 } mtproto.js:749:4
655 12:27:42.965 CALL =>> API call messages.getAllStickers Object { hash: "" } Object { } mtproto.js:749:4
696 12:27:43.920 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 908ms]
712 12:27:44.613 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 303ms]
727 12:27:46.488 msg-r <<=m [msg_container] Object { _: "msg_container", messages: Array[3] } mtproto.js:1452:5
728 12:27:46.489 msg-r <<=m [message] Object { _: "message", msg_id: "6242200970862778369", seqno: 11, bytes: 36, body: Object } mtproto.js:1452:5
729 12:27:46.489 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200960159395644", result: Object } mtproto.js:1452:5
730 12:27:46.490 msg-r <<=m [message] Object { _: "message", msg_id: "6242200970891641857", seqno: 13, bytes: 776, body: Object } mtproto.js:1452:5
731 12:27:46.492 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200960356118244", result: Object } mtproto.js:1452:5
732 12:27:46.494 msg-r <<=m [message] Object { _: "message", msg_id: "6242200970897958913", seqno: 15, bytes: 16, body: Object } mtproto.js:1452:5
733 12:27:46.495 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200960337591900", result: true } mtproto.js:1452:5
740 12:27:46.567 msg-r <<=m [msg_container] Object { _: "msg_container", messages: Array[4] } mtproto.js:1452:5
741 12:27:46.568 msg-r <<=m [message] Object { _: "message", msg_id: "6242200970862778369", seqno: 11, bytes: 36, body: Object } mtproto.js:1452:5
742 12:27:46.569 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200960159395644" } mtproto.js:1452:5
743 12:27:46.569 msg-r <<=m [message] Object { _: "message", msg_id: "6242200970891641857", seqno: 13, bytes: 776, body: Object } mtproto.js:1452:5
744 12:27:46.570 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200960356118244" } mtproto.js:1452:5
745 12:27:46.571 msg-r <<=m [message] Object { _: "message", msg_id: "6242200970897958913", seqno: 15, bytes: 16, body: Object } mtproto.js:1452:5
746 12:27:46.572 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200960337591900" } mtproto.js:1452:5
747 12:27:46.573 msg-r <<=m [message] Object { _: "message", msg_id: "6242200973791209473", seqno: 17, bytes: 76, body: Object } mtproto.js:1452:5
748 12:27:46.574 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200964892679524", result: Object } mtproto.js:1452:5
754 12:27:46.584 CALL =>> API call messages.getStickerSet Object { stickerset: Object } Object { } mtproto.js:749:4
811 12:27:47.346 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 539ms]
818 12:27:48.175 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242200981275507620", result: Object } mtproto.js:1452:5
857 12:27:49.351 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 25141ms]
864 12:27:57.219 msg-r <<=m [msgs_ack] Object { _: "msgs_ack", msg_ids: Array[0] } mtproto.js:1452:5
870 12:28:04.673 CALL =>> API call messages.readHistory Object { peer: Object, max_id: 0 } Object { } mtproto.js:749:4
908 12:28:04.860 CALL =>> API call messages.getHistory Object { peer: Object, offset_id: 16, add_offset: 0, limit: 20 } Object { timeout: 300, noErrorBox: true } mtproto.js:749:4
922 12:28:05.713 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 367ms]
929 12:28:06.096 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242201058769372356", result: Object } mtproto.js:1452:5
936 12:28:15.702 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242201058769372356" } mtproto.js:1452:5
977 12:28:16.122 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 25170ms]
983 12:28:26.637 CALL =>> API call account.updateStatus Object { offline: true } Object { noErrorBox: true } mtproto.js:749:4
1016 12:28:26.660 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 302ms]
1023 12:28:27.062 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242201153183272948", result: true } mtproto.js:1452:5
1030 12:28:41.985 msg-r <<=m [rpc_result] Object { _: "rpc_result", req_msg_id: "6242201153183272948" } mtproto.js:1452:5
1071 12:28:42.421 SEND POST XHR http://149.154.167.91/apiw1 [HTTP/1.1 200 OK 25165ms]
So far I have been able to implement the telegram authorization completely, but not in your requested language - PHP, I used vb.Net. However, I believe the same logic should apply.
Creating a Telegram Authorization Key
Telegram API is no walk in the park. Studying existing src code could be quite daunting (IMHO). Hence my approach was to study the online API documentation and implement the sample-auth_key outlined in the links below.
https://core.telegram.org/mtproto/auth_key
https://core.telegram.org/mtproto/samples-auth_key
What this approach will give you is a better understanding and introduction to the primitives used throughout Telegram API, and possibly help you start organizing your own set of functions and routines to handle which you will need for the next steps - implementing other features of the API, since generating an AuthKey is just the beginning.
Step 1
All Communication is via TCP - Once you have obtained a unique api_id (https://core.telegram.org/api/obtaining_api_id#obtaining-api-id) you will find the following IP advertised for use in testing: 149.154.167.40:433 The api_id is not required at this point for generating an AuthKey
Setup your preferred method of Send/Receive TCP processing Loop
what I have is a private SendData that simply sends a bytes to a live socket connected to the give IP address above
Private Sub SendData(b() As Byte, Optional read As Boolean = False)
If Not IsConnected() Then
Log("Connection Closed!", ConsoleColor.DarkRed)
RaiseEvent Disconneted()
Exit Sub
End If
b = TCPPack(b)
Dim arg = New SocketAsyncEventArgs With {.RemoteEndPoint = ep}
AddHandler arg.Completed, AddressOf IO_Handler
arg.SetBuffer(b, 0, b.Length)
Try
If Not soc.SendAsync(arg) Then
IO_Handler(soc, arg)
End If
If read Then
ReadData()
End If
Catch ex As Exception
Log("SendData: " & ex.ToString, ConsoleColor.Red)
End Try
End Sub
Private Sub ReadData(Optional wait As Integer = 0)
If Not IsConnected() Then
Log("Connection Closed!", ConsoleColor.DarkRed)
RaiseEvent Disconneted()
Exit Sub
End If
Dim arg = New SocketAsyncEventArgs With {.RemoteEndPoint = ep}
AddHandler arg.Completed, AddressOf IO_Handler
Dim b(BUFFER_SIZE - 1) As Byte
arg.SetBuffer(b, 0, BUFFER_SIZE)
Try
If Not soc.ReceiveAsync(arg) Then
IO_Handler(soc, arg)
End If
Catch ex As Exception
Log("ReadMessages: " & ex.ToString, ConsoleColor.Red)
End Try
End Sub
Private Sub IO_Handler(sender As Object, e As SocketAsyncEventArgs)
Log($"{e.LastOperation}:{e.SocketError}:{e.BytesTransferred}", ConsoleColor.Cyan)
Select Case e.SocketError
Case SocketError.Success
Select Case e.LastOperation
Case SocketAsyncOperation.Connect 'A socket Connect operation.
Log("Connected to " & e.ConnectSocket.RemoteEndPoint.ToString, ConsoleColor.Green)
are.Set()
Case SocketAsyncOperation.Disconnect, SocketAsyncOperation.Connect
RaiseEvent Disconneted()
Case SocketAsyncOperation.Receive 'A socket Receive operation.
HandleData(e)
End Select
Case SocketError.ConnectionAborted
RaiseEvent Disconneted()
End Select
End Sub
Private Sub HandleData(e As SocketAsyncEventArgs)
If e.BytesTransferred = 0 Then --no pending data
Log("The remote end has closed the connection.")
Exit Sub
End If
Dim len As Integer = e.Buffer(0)
Dim start = 1
If len = &H7F Then
len = e.Buffer(1)
len += e.Buffer(2) << 8
len += e.Buffer(3) << 16
start = 4
End If
len = 4 * len
Dim data(len - 1) As Byte
Array.Copy(e.Buffer, start, data, 0, len)
ProcessResponse(data)
ReadData()
End Sub
Finally for this step, we need a TcpPack() method which helps us pad our data in the format Telegram expects - see code below with comments
Private Function TCPPack(b As Byte()) As Byte()
Dim a = New List(Of Byte)
Dim len = CByte(b.Length / 4)
If efSent = False Then --TCP abridged version
efSent = True
a.Add(&HEF)
End If
If len >= &H7F Then
a.Add(&H7F)
a.AddRange(BitConverter.GetBytes(len))
Else
a.Add(len)
End If
a.AddRange(b) --only data, no sequence number, no CRC32
Return a.ToArray
End Function
STEP 2
With the basic TCP send/receive routines setup, we can start preparing data packets to send to telegram and have sub routines for handling the specific responses received - ProcessResponse(data)
What we need to understand next is the fact that Telegram handles 2 broad categories of messages -
Unencrypted - https://core.telegram.org/mtproto/description#unencrypted-message
These are plain text messages with their auth_key_id =0 generating an AuthKey uses this type of message throughout
Encrypted - https://core.telegram.org/mtproto/description#encrypted-message-encrypted-data
All further communication with Telegram Servers will be via encrypted messages
I choose to have two classes to encapsulate both message types. I can then have two Send(m) methods that handles each type
Private Sub Send(m As UnencryptedMessage)
Log(m.ToString, ConsoleColor.DarkYellow, logTime:=False)
SendData(m.data, True)
End Sub
Private Sub Send(m As EncryptedMessage)
Log(m.ToString, ConsoleColor.DarkYellow, logTime:=False)
SendData(m.data, True)
End Sub
For now only UnencryptedMessage is required
Public Class UnencryptedMessage
Public Property auth_key_id As Int64
Public Property message_id As Int64
Public Property data_length As Int32
Public Property message_data As Byte()
Public Property message_type As String
Public Property data As Byte() = {}
Sub New(auth_key As Int64, message_id As Int64, data As Byte())
_auth_key_id = auth_key
_message_id = message_id
_data_length = data.Length
_message_data = data
message_type = B2Hr(data, 0, 4)
Dim a = New List(Of Byte)
a.AddRange(BitConverter.GetBytes(auth_key_id)) --{0, 0, 0, 0, 0, 0, 0, 0}
a.AddRange(BitConverter.GetBytes(message_id))
a.AddRange(BitConverter.GetBytes(data_length))
a.AddRange(message_data)
Me.data = a.ToArray
End Sub
Sub New(b As Byte())
data = b
Dim skip = 0
_auth_key_id = BitConverter.ToInt64(b, skip) : skip += 8
_message_id = BitConverter.ToInt64(b, skip) : skip += 8
_data_length = BitConverter.ToInt32(b, skip) : skip += 4
ReDim _message_data(_data_length - 1)
Array.Copy(b, skip, _message_data, 0, b.Length - skip)
message_type = B2Hr(_message_data, 0, 4)
End Sub
Public Overrides Function ToString() As String
Return $"
raw_data: {B2H(data)}
auth_key_id: {i2H(auth_key_id)} {auth_key_id}
message_id: {i2H(message_id)} {message_id}
data_length: {i2H(data_length)} {data_length}
message_data: {B2H(message_data)}
message_type: {message_type}
"
End Function
End Class
STEP 3
Now we follow he series of steps outlined in https://core.telegram.org/mtproto/auth_key
- https://core.telegram.org/mtproto/auth_key#dh-exchange-initiation
- Client sends query to server
req_pq#60469778 nonce:int128 = ResPQ The value of nonce is selected randomly by the client (random number) and identifies the client within this communication. Following this step, it is known to all.
- Server sends response of the form
resPQ#05162463 nonce:int128 server_nonce:int128 pq:string server_public_key_fingerprints:Vector long = ResPQ
My approach for this is very simple:
Sub RequestPQAuthorization()
Send(MTProto.req_pq)
End Sub
In a Class called MTProto I implement a set of shared functions as required by each step of the exchange. Each method is simply building up an Encrypted data structure which will be sent as above where required
We start with: req_pq
Shared Function req_pq(Optional nonce As Byte() = Nothing) As UnencryptedMessage
--req_pq#60469778
--nonce:int128
If nonce Is Nothing Then
ReDim nonce(15)
RND.NextBytes(nonce)
End If
Dim d = New List(Of Byte)
d.AddRange({120, 151, 70, 96}) --60469778
d.AddRange(nonce)
Return New UnencryptedMessage(0, CreateMessageId, d.ToArray)
End Function
Private Shared Function CreateMessageId() As Int64
Return CLng((Date.UtcNow.Ticks - ZERO_TICK) * 429.4967296)
End Function
Public Const ZERO_TICK = 621355968000000000 -- i.e. 1970-01-01T00:00:00Z (January 1, 1970, at 12:00 AM UTC)
Now our process response method from Step 1
Private Sub ProcessResponse(data As Byte())
Try
Dim r = New UnencryptedMessage(data)
Log(r.ToString, ConsoleColor.Yellow, logTime:=False)
Select Case r.message_type
Case resPQ.Classid
RequestDHKeyExchange(New resPQ(r.message_data))
Case server_DH_params_ok.Classid
RequestSetDH_params(New server_DH_params_ok(r.message_data), new_nonce)
Case server_DH_params_fail.Classid
Log(New server_DH_params_fail(r.message_data).ToString, ConsoleColor.DarkMagenta)
Case dh_gen_ok.Classid
Log(New dh_gen_ok(r.message_data).ToString, ConsoleColor.Green)
Case dh_gen_retry.Classid
Log(New dh_gen_retry(r.message_data).ToString, ConsoleColor.DarkMagenta)
Case dh_gen_fail.Classid
Log(New dh_gen_fail(r.message_data).ToString, ConsoleColor.DarkMagenta)
Case Else
Log($"Unhandled type: {r.message_type}", ConsoleColor.Magenta)
End Select
Catch ex As Exception
Log($"Error: {ex.ToString}", ConsoleColor.Red)
Log(B2H(data), ConsoleColor.DarkRed, logTime:=False)
End Try
End Sub
Great so far, each response received has a message_type code.
we can switch on that and determine how each is handled. We need to process resPQ right now.
What i have done is to create a a set of classes that each handles a specific response type
''' <summary>
''' resPQ#05162463
''' nonce:int128 server_nonce:int128 pq:string server_public_key_fingerprints:Vector long = ResPQ
''' </summary>
Public NotInheritable Class resPQ : Inherits TLObject
Public Shared Shadows ReadOnly Property Classid As String = "05162463"
Public Property nonce As Byte()
Public Property server_nonce As Byte()
Public Property pq As Byte()
Public Property fingerprints As List(Of UInt64)
Public Property count As Int32
Sub New(data As Byte())
Dim skip = 4
nonce = Slice(data, skip, 16) : skip += 16
server_nonce = Slice(data, skip, 16) : skip += 16
skip += 1 'length of pq:string
pq = Slice(data, skip, 8) : skip += 8
skip += 3 'padding to complete the 4-bytes
skip += 4 '%(Vector long) 1cb5c415
count = i32r(data, skip) : skip += 4
fingerprints = New List(Of UInt64)
For i = 0 To count - 1
fingerprints.Add(u64r(data, skip))
Next
End Sub
Public Overrides Function ToString() As String
Return $"
classid: {NameOf(resPQ)}#{Classid}
nonce: {B2H(nonce)}
server_nonce: {B2H(server_nonce)}
pq: {B2H(pq)} {u64(pq)}
count: {i2H(count)} {count}
fingerprints: {i2H(fingerprints(0))} {fingerprints(0)}
"
End Function
End Class
Each is based on this simple object
Public MustInherit Class TLObject
Public Shared Property ClassId As String
Public MustOverride Overrides Function ToString() As String
End Class
Building on this, we tackle steps 3 & 4
Proof of work 3) Client decomposes pq into prime factors such that p < q.
This starts a round of Diffie-Hellman key exchanges.
Presenting proof of work; Server authentication 4) Client sends query to server
req_DH_params#d712e4be nonce:int128 server_nonce:int128 p:string q:string public_key_fingerprint:long encrypted_data:string = Server_DH_Params
This is initiated here RequestDHKeyExchange(New resPQ(r.message_data)) in my ProcessResponse routine above
Sub RequestDHKeyExchange(r As resPQ)
Log(r.ToString, ConsoleColor.Gray, logTime:=False)
'decompose prime cofactors
Dim pp = New PrimeProduct(r.pq)
Log(pp.ToString, ConsoleColor.Gray, logTime:=False)
'encrypted_data Generation
Dim pq = New P_Q_inner_data(r.pq, pp.p, pp.q, r.nonce, r.server_nonce)
new_nonce = pq.new_nonce
'The serialization Of P_Q_inner_data produces some String data. This Is followed by encrypted_data
'data_with_hash := SHA1(data) + data + (any random bytes); such that the length equal 255
Dim data_with_hash = New List(Of Byte)
'SHA1(data) = xxx- 40 =20 bytes
Using sha1 = New SHA1Managed
Dim b = pq.ToBytes
data_with_hash.AddRange(sha1.ComputeHash(b))
data_with_hash.AddRange(b)
End Using
If data_with_hash.Count < 255 Then
Dim pad(255 - data_with_hash.Count - 1) As Byte
RND.NextBytes(pad)
data_with_hash.AddRange(pad)
End If
'RSA(data_with_hash, server_public_key) = xxx - 512 = 256 bytes
Dim key = i2H(r.fingerprints(0)) 'c3b42b026ce86b21
Dim zb = Crypto.rsaEncrypt(data_with_hash.ToArray, key)
Send(MTProto.req_DH_params(r.nonce, r.server_nonce, pp.p, pp.q, r.fingerprints(0), zb))
End Sub
You can use your own implementation of Prime-Decomposition to replace this line Dim pp = New PrimeProduct(r.pq)
Here is an example of how I learnt do it using PollardBrent (Pollard Rho Brent Integer Factorization) https://stackoverflow.com/a/31978350/44080
Okay if you can follow up to this point you have a general idea of how i'm decomposing the AuthKey implementation step by step.
You should be able to run through the remaining steps 5-9. It's a lot for me to type...
If this answer so far is of any help to anyone, then i'll take out time to organize and post the remaining part.
I believe that the routines and knowledge you build up along the way should give you the tools you need to both understand and implement your own independent Telegram API code from scratch.
Completed Interaction Dump
03:33:26.591 Connect:Success:0
03:33:26.593 Connected to 149.154.167.40:443
03:33:26.598
raw_data: 000000000000000000DC799836FE075614000000789746604479257F6C01C039A3DEAD031BC2D6A4
auth_key_id: 0000000000000000 0
message_id: 5607FE369879DC00 6199202922538589184
data_length: 00000014 20
message_data: 789746604479257F6C01C039A3DEAD031BC2D6A4
message_type: 60469778
03:33:26.600 Send:Success:42
03:33:26.735 Receive:Success:85
03:33:26.737
raw_data: 0000000000000000015CF64539FE075640000000632416054479257F6C01C039A3DEAD031BC2D6A44F9DB065B36308CF4D9965725DD7153D0818DDCAF407B7CDCD00000015C4B51C01000000216BE86C022BB4C3
auth_key_id: 0000000000000000 0
message_id: 5607FE3945F65C01 6199202934039141377
data_length: 00000040 64
message_data: 632416054479257F6C01C039A3DEAD031BC2D6A44F9DB065B36308CF4D9965725DD7153D0818DDCAF407B7CDCD00000015C4B51C01000000216BE86C022BB4C3
message_type: 05162463
03:33:26.743
classid: resPQ#05162463
nonce: 4479257F6C01C039A3DEAD031BC2D6A4
server_nonce: 4F9DB065B36308CF4D9965725DD7153D
pq: 18DDCAF407B7CDCD 1791811376213642701
count: 00000001 1
fingerprints: C3B42B026CE86B21 14101943622620965665
03:33:26.810
PQ: 18DDCAF407B7CDCD 1791811376213642701
P: 45F57B87 1173715847
Q: 5AFE490B 1526614283
03:33:26.930
raw_data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
auth_key_id: 0000000000000000 0
message_id: 5607FE36EE3C4000 6199202923977392128
data_length: 00000140 320
message_data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
message_type: D712E4BE
03:33:26.933 Send:Success:341
03:33:27.217 Receive:Success:656
03:33:27.217
raw_data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
auth_key_id: 0000000000000000 0
message_id: 5607FE399F9A1C01 6199202935543045121
data_length: 00000278 632
message_data: 5C07E8D04479257F6C01C039A3DEAD031BC2D6A44F9DB065B36308CF4D9965725DD7153DFE500200752C7BDBB6A58D68B76D2E20DCECF611B2837CA34F3688B242192C633FBBC1EC9348880DA6E6AFF42B256D8476A2C432B60E93218F5B84982B0F9800E6EF918AEC4B729AB1A67C82EF2C4D281352D1BEAEB6B9026CAA0CA8FB03F9257E2CA034471EE25CF6E214BB770E233566A67155BE8FB8F9DA0A76964CFD19E9C97D3E57AAA26E7A6C16B12F2B2BFD4C437857032F0A7198567B9CD3A54BD06CE61A1EBACD70D464185719BC8E0381C99E80A5783D389BE73E97166A328CEDB3AA4D722D453EB4CA893299E41DDC81C798BC76CAF070BFF144F6800D8FE5B3B6BCC9A1138E7ADA6DAF3F581AAB0137A6D40E640E76F6539B1450EA30A55E3F56C2C0A8DCC6F9F4D4F185D25AF37B46B9D9B8ED5CA257DD32EDE02FF95C6174C9D4BA1E30035723C7E2DED9EB0794AAA1913073E4EA2D5649C5C491B252AF88FF1D71EFB5E9FFCA921F0F27F72723DD5014359D08101278DF3F9A9A10DDE54B93A386C6844A6D15AF142DA956A3999458D10BBDE4E947BE949199F088B91175EC9EEE3C95AC47C96D802B0DC91AA6DB5B8A03E0985412DD23CD33FD961175CD271E02BF8A05A537E8FE21CDB40EBAAC0C8D4718DA4499D5B5EF935B848F92C25E9CAE76021758EDD1AA202A0D0DC357348B0474069002EB8F5F2760F2C5BEE38C7CEA07737C28864F647F2406BD55ABD58EEED97A4C8E659143441B1F8CB8DEFE457B46B5E76541CAB63FA1CD3626F0A45DB8A37964BF2613A6C64E6E6E478D44A2AF19CAD6C2686FD55EC85CACD645E58C364CBBD09EF1C7FE7420A8EF277982B87CA18D16B97980B14D24747D9BC86563DA81DA
message_type: D0E8075C
03:33:27.240
classid: server_DH_params_ok#D0E8075C
nonce: 4479257F6C01C039A3DEAD031BC2D6A4
server_nonce: 4F9DB065B36308CF4D9965725DD7153D
enc_answer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
tmp_aes_key: 297CB750FF0052B67515B3F11B45F11F15D106BC25ED0027570D5B9D83102BFA
tmp_aes_iv: CBDCF40A77B6A1C7CE74A1F8EC8E091A49FAD3B9A2499BFFFD084D537A53B36D
answer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
classid: Server_DH_inner_data#B5890DBA
nonce: 4479257F6C01C039A3DEAD031BC2D6A4
server_nonce: 4F9DB065B36308CF4D9965725DD7153D
g: 00000003 3
dh_prime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
g_a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
server_time: 5607FE39 1443364409
client_time: 5607FE37 1443364407
padding: 646CF781176C3EAC
DH_Prime is Safe? = True
classid: Client_DH_Inner_Data#6643B654
nonce: 4479257F6C01C039A3DEAD031BC2D6A4
server_nonce: 4F9DB065B36308CF4D9965725DD7153D
retry_id: 0000000000000000 0
g_b: 923A21384FE0318D569B2F2BEA667D1A999050A0A1B5AFDA39F2B890DEE45F9ED08E319C8243CD1496269CCF956DFA6C98633BDC2E26B1675C15D7904417EC2A74C687E682ED14182178BC0BD189F6E020131C87FD42A24798FCCD2416348EE0AAF534B652175BAC33E89C82874A8C3E8562815DDA213610167B10153EFC1BD1A0CFBACFEA22E3E8D80917F262D2C67BF1327A245CF7FE0E299F7517EE6A2F65568630A6191FEB0C1254F260A6554ED2BEE19E94AAB693E58DD032C26B9CAFEB0482F12DE2573B6E6D2816AC37ADDF3B99525FDBAF94690926320CC67ABF35D3EA6EC6CC7211BAF11FBDD6897959F6F1E3D4335B89B3024C1B3C0066246B5DCD
03:33:27.590 enc_data: 0A974C499344B093ADF321597858B1A6179E2A6C21F5FF9EB5DE687CDB57F8059509482FF9846FBE99D9411C13A645B26F73960424A13337D87DA879864FCA9D0883B643CF8EB594446038E0B6C4FD606D0CB77F1E00CCA6291DD65733F6A60217C7F366AD88972F107C381FD375F49DB57A2AB96988EC916629CD6F58B53F65DF4909AA773CCA43CE43671CA313528190213CF28A3B29BE26865BE22EB0C41E89CBD698C96CBC1B7B7F1586FBD61B422693859843F7D32083E3AB23D607FC4B874DB849F430F74483969ABA4603B483C94BCEB38F8EC90EEB58B338B325A8E37B57813CEC7E795B1B5517D732227856955C53BA18F52E55C6BCD8F1419D43D46DF2C2560B74BA7AA961BB4BDD09ABBC95E4F57AC4B8C89A67C7C5453A3EFB635D3977E0C3F0067C1F4D255F1F87E74A8E7E4272DFDEB9B85ABBEFA4953B2E0ECAA15C3C77773155C4013955BAB0D85F
03:33:27.810 auth_Key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
03:33:27.813
raw_data: 0000000000000000009C48D037FE0756780100001F5F04F54479257F6C01C039A3DEAD031BC2D6A44F9DB065B36308CF4D9965725DD7153DFE5001000A974C499344B093ADF321597858B1A6179E2A6C21F5FF9EB5DE687CDB57F8059509482FF9846FBE99D9411C13A645B26F73960424A13337D87DA879864FCA9D0883B643CF8EB594446038E0B6C4FD606D0CB77F1E00CCA6291DD65733F6A60217C7F366AD88972F107C381FD375F49DB57A2AB96988EC916629CD6F58B53F65DF4909AA773CCA43CE43671CA313528190213CF28A3B29BE26865BE22EB0C41E89CBD698C96CBC1B7B7F1586FBD61B422693859843F7D32083E3AB23D607FC4B874DB849F430F74483969ABA4603B483C94BCEB38F8EC90EEB58B338B325A8E37B57813CEC7E795B1B5517D732227856955C53BA18F52E55C6BCD8F1419D43D46DF2C2560B74BA7AA961BB4BDD09ABBC95E4F57AC4B8C89A67C7C5453A3EFB635D3977E0C3F0067C1F4D255F1F87E74A8E7E4272DFDEB9B85ABBEFA4953B2E0ECAA15C3C77773155C4013955BAB0D85F
auth_key_id: 0000000000000000 0
message_id: 5607FE37D0489C00 6199202927769852928
data_length: 00000178 376
message_data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
message_type: F5045F1F
03:33:27.823 Send:Success:397
03:33:27.983 Receive:Success:73
03:33:27.985
....
Regards.