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84 lines
3.3 KiB
C#
84 lines
3.3 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.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[] key;
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public static void MakeKey(string STitle, string SCopyright,string SProject, byte MagicChar)
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{
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byte[] nameBytes = Encoding.ASCII.GetBytes(STitle);
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var name = Marshal.AllocHGlobal(STitle.Length);
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Marshal.Copy(nameBytes, 0, name, STitle.Length);
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byte[] copyrightBytes = Encoding.ASCII.GetBytes(SCopyright);
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var copyright = Marshal.AllocHGlobal(SCopyright.Length);
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Marshal.Copy(copyrightBytes, 0, copyright, SCopyright.Length);
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byte[] filenameBytes = Encoding.ASCII.GetBytes(SProject);
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var pathfilename = Marshal.AllocHGlobal(SProject.Length);
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Marshal.Copy(filenameBytes, 0, pathfilename, SProject.Length);
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var ptr = Decryption.make_key(name, copyright, pathfilename, MagicChar);
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byte[] Key = new byte[257];
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Marshal.Copy(ptr, Key, 0, 257);
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Marshal.FreeHGlobal(name);
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Marshal.FreeHGlobal(copyright);
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Marshal.FreeHGlobal(pathfilename);
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key = Key;
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//some hardcoded checks for SL
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if (Console.ReadKey().Key==ConsoleKey.N)
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{
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if(key[73] == 0xB2)
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{
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return;
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}
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MakeKey("Sister Location", "Scott Cawthon", @"C:\Users\Scott\Desktop\FNAF 5\FNaF 5-157.mfa", 54);
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}
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}
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public static byte[] DecodeMode3(byte[] ChunkData, int ChunkSize,int ChunkID, byte MagicChar)
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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 chunkData = reader.ReadBytes((int)reader.Size());
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chunkData[0] ^= (byte)(((byte)ChunkID & 0xFF) ^ ((byte)ChunkID >> 0x8));
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var data = new ByteIO(DecodeChunk(chunkData,ChunkSize,MagicChar));
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var compressed_size = data.ReadUInt32();
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return Decompressor.decompress_block(data, (int)compressed_size, (int)DecompressedSize);
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}
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public static byte[] DecodeChunk(byte[] ChunkData, int ChunkSize,byte MagicChar)
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{
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//Console.WriteLine("Decoding: "+ChunkData.Log(false,"X2"));
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IntPtr InputChunkPtr = Marshal.AllocHGlobal(ChunkSize);
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Marshal.Copy(ChunkData, 0, InputChunkPtr, ChunkSize-4);
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var OutputChunkPtr = decode_chunk(InputChunkPtr, ChunkSize, MagicChar);
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byte[] DecodedChunk = new byte[ChunkSize];
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Marshal.Copy(OutputChunkPtr, DecodedChunk,0,ChunkSize);
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//Console.WriteLine("Result: " + DecodedChunk.Log(false, "X2"));
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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 chunk_data,int chunk_size, byte magic_char);
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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 c_title, IntPtr c_copyright, IntPtr c_project, byte magic_char);
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}
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}
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