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82 lines
3.1 KiB
C#
82 lines
3.1 KiB
C#
using NetMFAPatcher.Utils;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace NetMFAPatcher.utils
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{
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class Decryption
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{
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public static byte[] DecryptionKey;
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public static byte MagicChar=54;
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public static void MakeKey(string sTitle, string sCopyright,string sProject)
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{
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var rawKey = "";
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rawKey += sTitle;
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rawKey += sCopyright;
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rawKey += sProject;
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Logger.Log("Combined data "+rawKey,true,ConsoleColor.Yellow);
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var rawKeyPtr = Marshal.StringToHGlobalAnsi(rawKey);
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var ptr = Decryption.make_key_combined(rawKeyPtr, MagicChar);
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byte[] key = new byte[257];
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Marshal.Copy(ptr, key, 0, 256);
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Marshal.FreeHGlobal(rawKeyPtr);
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DecryptionKey = key;
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Logger.Log($"First 16-Bytes of key: {DecryptionKey.GetHex(16)}",true,ConsoleColor.Yellow);
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File.WriteAllBytes($"{Program.DumpPath}\\key.bin", DecryptionKey);
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}
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public static byte[] DecodeMode3(byte[] chunkData, int chunkSize,int chunkId)
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{
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var reader = new ByteIO(chunkData);
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var decompressedSize = reader.ReadUInt32();
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var rawData = reader.ReadBytes((int)reader.Size());
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if (chunkId % 2 != 0)
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{
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rawData[0] ^= (byte)(((byte)chunkId & 0xFF) ^ ((byte)chunkId >> 0x8));
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}
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rawData = DecodeChunk(rawData, chunkSize);
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var data = new ByteIO(rawData);
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var compressedSize = data.ReadUInt32();
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return Decompressor.decompress_block(data, (int)compressedSize, (int)decompressedSize);
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}
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public static byte[] DecodeChunk(byte[] chunkData, int chunkSize)
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{
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IntPtr inputChunkPtr = Marshal.AllocHGlobal(chunkData.Length);
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Marshal.Copy(chunkData, 0, inputChunkPtr, chunkData.Length);
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IntPtr keyPtr = Marshal.AllocHGlobal(DecryptionKey.Length);
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Marshal.Copy(DecryptionKey, 0, keyPtr, DecryptionKey.Length);
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var outputChunkPtr = decode_chunk(inputChunkPtr, chunkSize, MagicChar, keyPtr);
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byte[] decodedChunk = new byte[chunkSize];
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Marshal.Copy(outputChunkPtr, decodedChunk,0,chunkSize);
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Marshal.FreeHGlobal(inputChunkPtr);
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Marshal.FreeHGlobal(keyPtr);
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return decodedChunk;
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}
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[DllImport("Decrypter-x64.dll", EntryPoint = "decode_chunk", CharSet = CharSet.Auto)]
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public static extern IntPtr decode_chunk(IntPtr chunkData, int chunkSize, byte magicChar,IntPtr wrapperKey);
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[DllImport("Decrypter-x64.dll", EntryPoint = "make_key", CharSet = CharSet.Auto)]
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public static extern IntPtr make_key(IntPtr cTitle, IntPtr cCopyright, IntPtr cProject, byte magicChar);
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[DllImport("Decrypter-x64.dll", EntryPoint = "make_key_combined", CharSet = CharSet.Auto)]
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public static extern IntPtr make_key_combined(IntPtr data, byte magicChar);
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}
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}
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