Mirror/EpinelPS
1
0
Fork 0
mirror of https://github.com/EpinelPS/EpinelPS.git synced 2025-12-14 07:55:01 +01:00
Code Issues Packages Projects Releases Wiki Activity

implement more things

Browse Source
This commit is contained in:
Mikhail Thompson
2024-06-27 16:38:42 +03:00
parent 16cece6560
commit 4ffb238c6e
10 changed files with 272 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

78
nksrv/Utils/PacketDecryption.cs
View File

@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.DataProtection.KeyManagement;
using nksrv.LobbyServer;
using Sodium;
using System;
using System.Buffers.Binary;
using System.Collections.Generic;
using System.IO.Compression;
using System.Linq;
@@ -64,20 +65,10 @@ namespace nksrv.Utils
// File.WriteAllBytes("fullPkt-decr", ms.ToArray());
var unkVal1 = ms.ReadByte();
var pktLen = ms.ReadByte() & 0x1f;
var unkVal2 = ms.ReadByte();
var sequenceNumber = ReadCborInteger(ms);
var seqNumB = ms.ReadByte();
var seqNum = seqNumB;
if (seqNumB >= 24)
{
var b = ms.ReadByte();
seqNum = BitConverter.ToUInt16(new byte[] { (byte)b, (byte)seqNumB }, 0);
// todo support uint32
}
var startPos = (int)ms.Position;
//Console.WriteLine("seg #: " + seqNum + ",actual:" + bytes.Length + "cntlen:" + ctx.Request.ContentLength64);
@@ -103,6 +94,69 @@ namespace nksrv.Utils
return new PacketDecryptResponse() { Contents = buffer.ToArray() };
}
public static ulong ReadCborInteger(Stream stream)
{
// Read the initial byte
int initialByte = stream.ReadByte();
if (initialByte == -1)
{
throw new EndOfStreamException("Stream ended unexpectedly");
}
// Major type is the first 3 bits of the initial byte
int majorType = (initialByte >> 5) & 0x07;
// Additional info is the last 5 bits of the initial byte
int additionalInfo = initialByte & 0x1F;
if (majorType != 0)
{
//throw new InvalidDataException("Not a valid CBOR unsigned integer");
}
ulong value;
if (additionalInfo < 24)
{
value = (ulong)additionalInfo;
}
else if (additionalInfo == 24)
{
value = (ulong)stream.ReadByte();
}
else if (additionalInfo == 25)
{
Span<byte> buffer = stackalloc byte[2];
if (stream.Read(buffer) != 2)
{
throw new EndOfStreamException("Stream ended unexpectedly");
}
value = BinaryPrimitives.ReadUInt16BigEndian(buffer);
}
else if (additionalInfo == 26)
{
Span<byte> buffer = stackalloc byte[4];
if (stream.Read(buffer) != 4)
{
throw new EndOfStreamException("Stream ended unexpectedly");
}
value = BinaryPrimitives.ReadUInt32BigEndian(buffer);
}
else if (additionalInfo == 27)
{
Span<byte> buffer = stackalloc byte[8];
if (stream.Read(buffer) != 8)
{
throw new EndOfStreamException("Stream ended unexpectedly");
}
value = BinaryPrimitives.ReadUInt64BigEndian(buffer);
}
else
{
throw new InvalidDataException("Invalid additional info for CBOR unsigned integer");
}
return value;
}
public static byte[] EncryptData(byte[] message, string authToken)
{
var key = LobbyHandler.GetInfo(authToken);