source

Created by: Andrew
2016-08-27 22:43:23 -04:00
commit 6d74d5b59e
31 changed files with 3002 additions and 0 deletions
--- a/trunk/Common/Net/Cryptography.cs
+++ b/trunk/Common/Net/Cryptography.cs
@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace KartExtreme.Net
+{
+    class Cryptography
+    {
+        public static uint HashPacket(byte[] pData, uint pKey, bool pEncrypt, uint npacketLength)
+        {
+            uint hash1 = (pKey ^ 0x14B307C8);
+            uint hash2 = (pKey ^ 0x8CBF12AC);
+            uint hash3 = (pKey ^ 0x240397C1);
+            uint hash4 = (pKey ^ 0xF3BD29C0);
+
+            uint checksum = 0;
+            int packetLength = (int)npacketLength;//pData.Length;
+
+            
+            Action<int, uint> doHash = (index, hash) =>
+            {
+                pData[index + 0] ^= (byte)(hash & 0xFF);
+                pData[index + 1] ^= (byte)((hash << 8) & 0xFF);
+                pData[index + 2] ^= (byte)((hash << 16) & 0xFF);
+                pData[index + 3] ^= (byte)((hash << 24) & 0xFF);
+            };
+
+            int offset = 0;
+            int i = 0;
+            for (i = 0; i < (packetLength >> 4); ++i)
+            {
+                if (pEncrypt) 
+                    checksum ^= (uint)(BitConverter.ToUInt32(pData, offset + 12) ^ BitConverter.ToUInt32(pData, offset + 8) ^ BitConverter.ToUInt32(pData, offset + 4) ^ BitConverter.ToUInt32(pData, offset + 0));
+
+                doHash(offset + 0, hash1);
+                doHash(offset + 4, hash2);
+                doHash(offset + 8, hash3);
+                doHash(offset + 12, hash4);
+
+                if (!pEncrypt)
+                    checksum ^= (uint)(BitConverter.ToUInt32(pData, offset + 12) ^ BitConverter.ToUInt32(pData, offset + 8) ^ BitConverter.ToUInt32(pData, offset + 4) ^ BitConverter.ToUInt32(pData, offset + 0));
+
+                offset += 16;
+            }
+
+
+            i *= 16;
+            int sub = 0;
+
+            ///Note: it has a problem with Checksum Calculation
+            while (i < packetLength)
+            {
+                if (pEncrypt) checksum ^= (uint)(pData[i] << sub);
+                pData[i] ^= (byte)(hash1 << (sub * 8));
+                if (!pEncrypt) checksum ^= (uint)(pData[i] << sub);
+                sub++;
+                i++;
+            }
+
+            /*
+            for (int i = offset; i < packetLength; i++)
+            {
+                if (pEncrypt) checksum ^= (uint)(pData[i] << sub);
+                pData[i] ^= (byte)(hash1 << (sub * 8));
+                if (!pEncrypt) checksum ^= (uint)(pData[i] << sub);
+                sub++;
+            }*/
+
+            return checksum;
+        }
+    }
+}