mirror of
https://github.com/crskycode/GARbro.git
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295 lines
11 KiB
C#
295 lines
11 KiB
C#
//! \file ArcINT.cs
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//! \date Fri Jul 11 09:32:36 2014
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//! \brief Frontwing games archive.
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//
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using System;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.ComponentModel.Composition;
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using System.Collections.Generic;
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using System.Diagnostics;
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using Simias.Encryption;
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using System.Runtime.InteropServices;
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using GameRes.Formats.Strings;
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using GameRes.Formats.Properties;
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namespace GameRes.Formats
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{
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public class FrontwingArchive : ArcFile
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{
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public readonly Blowfish Encryption;
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public FrontwingArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, Blowfish cipher)
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: base (arc, impl, dir)
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{
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Encryption = cipher;
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}
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}
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public class IntEncryptionInfo
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{
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public uint? Key { get; set; }
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public string Scheme { get; set; }
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public string Password { get; set; }
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public IntEncryptionInfo () { }
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}
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[Export(typeof(ArchiveFormat))]
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public class IntOpener : ArchiveFormat
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{
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public override string Tag { get { return "INT"; } }
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public override string Description { get { return arcStrings.INTDescription; } }
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public override uint Signature { get { return 0x0046494b; } }
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public override bool IsHierarchic { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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uint entry_count = file.View.ReadUInt32 (4);
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if (0 == entry_count || 0 != ((entry_count - 1) >> 0x14))
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{
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Trace.WriteLine (string.Format ("Invalid entry count ({0})", entry_count));
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return null;
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}
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if (file.View.AsciiEqual (8, "__key__.dat\x00"))
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{
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uint? key = QueryEncryptionInfo();
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if (null == key)
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throw new UnknownEncryptionScheme();
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return OpenEncrypted (file, entry_count, key.Value);
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}
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long current_offset = 8;
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var dir = new List<Entry>();
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for (uint i = 0; i < entry_count; ++i)
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{
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string name = file.View.ReadString (current_offset, 0x40);
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var entry = FormatCatalog.Instance.CreateEntry (name);
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entry.Offset = file.View.ReadUInt32 (current_offset+0x40);
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entry.Size = file.View.ReadUInt32 (current_offset+0x44);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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current_offset += 0x48;
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}
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return new ArcFile (file, this, dir);
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}
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private ArcFile OpenEncrypted (ArcView file, uint entry_count, uint main_key)
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{
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if (1 == entry_count)
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return null; // empty archive
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long current_offset = 8;
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var twister = new Twister();
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// [@@L1] = 32-bit key
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// [@@L1+4] = 0 if key is available, -1 otherwise
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uint key_data = file.View.ReadUInt32 (current_offset+0x44);
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uint twist_key = twister.Twist (key_data);
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// [@@L0] = 32-bit twist key
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byte[] blowfish_key = BitConverter.GetBytes (twist_key);
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if (!BitConverter.IsLittleEndian)
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Array.Reverse (blowfish_key);
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var blowfish = new Blowfish (blowfish_key);
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var dir = new List<Entry>();
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byte[] name_info = new byte[0x40];
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for (uint i = 1; i < entry_count; ++i)
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{
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current_offset += 0x48;
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file.View.Read (current_offset, name_info, 0, 0x40);
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uint eax = file.View.ReadUInt32 (current_offset+0x40);
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uint edx = file.View.ReadUInt32 (current_offset+0x44);
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eax += i;
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blowfish.Decipher (ref eax, ref edx);
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uint key = twister.Twist (main_key + i);
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string name = DecipherName (name_info, key);
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var entry = FormatCatalog.Instance.CreateEntry (name);
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entry.Offset = eax;
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entry.Size = edx;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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}
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return new FrontwingArchive (file, this, dir, blowfish);
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}
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private Stream OpenEncryptedEntry (FrontwingArchive arc, Entry entry)
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{
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using (var view = arc.File.CreateViewAccessor (entry.Offset, entry.Size))
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{
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byte[] data = new byte[entry.Size];
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// below is supposedly faster version of
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//arc.File.View.Read (entry.Offset, data, 0, entry.Size);
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unsafe
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{
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byte* ptr = view.GetPointer (entry.Offset);
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try {
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Marshal.Copy (new IntPtr(ptr), data, 0, data.Length);
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} finally {
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view.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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}
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arc.Encryption.Decipher (data, data.Length/8*8);
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return new MemoryStream (data, false);
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}
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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if (arc is FrontwingArchive)
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return OpenEncryptedEntry (arc as FrontwingArchive, entry);
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else
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return base.OpenEntry (arc, entry);
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}
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public string DecipherName (byte[] name, uint key)
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{
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key += (key >> 8) + (key >> 16) + (key >> 24);
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key &= 0xff;
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key %= 0x34;
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int count = 0;
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for (int i = 0; i < name.Length; ++i)
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{
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byte al = name[i];
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if (0 == al)
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break;
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byte bl = (byte)key;
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++count;
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uint edx = al;
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al |= 0x20;
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al -= 0x61;
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if (al < 0x1a)
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{
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if (0 != (edx & 0x20))
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al += 0x1a;
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al = (byte)~al;
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al += 0x34;
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if (al >= bl)
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al -= bl;
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else
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al = (byte)(al - bl + 0x34);
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if (al >= 0x1a)
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al += 6;
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al += 0x41;
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name[i] = al;
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}
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++key;
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if (0x34 == key)
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key = 0;
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}
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return Encodings.cp932.GetString (name, 0, count);
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}
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class Twister
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{
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const uint TwisterLength = 0x270;
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uint[] m_twister = new uint[TwisterLength];
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uint m_twister_pos = 0;
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public uint Twist (uint key)
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{
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Init (key);
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return Next();
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}
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public void Init (uint key)
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{
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uint edx = key;
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for (int i = 0; i < TwisterLength; ++i)
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{
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uint ecx = edx * 0x10dcd + 1;
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m_twister[i] = (edx & 0xffff0000) | (ecx >> 16);
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edx *= 0x1C587629;
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edx += 0x10dce;
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}
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m_twister_pos = 0;
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}
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public uint Next ()
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{
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uint ecx = m_twister[m_twister_pos];
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uint edx = m_twister_pos + 1;
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if (TwisterLength == edx)
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edx = 0;
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uint edi = m_twister[edx];
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edi = ((edi ^ ecx) & 0x7FFFFFFF) ^ ecx;
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bool carry = 0 != (edi & 1);
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edi >>= 1;
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if (carry)
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edi ^= 0x9908B0DF;
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ecx = m_twister_pos + 0x18d;
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if (ecx >= TwisterLength)
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ecx -= TwisterLength;
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edi ^= m_twister[ecx];
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m_twister[m_twister_pos] = edi;
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m_twister_pos = edx;
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uint eax = edi ^ (edi >> 11);
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eax = ((eax & 0xFF3A58AD) << 7) ^ eax;
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eax = ((eax & 0xFFFFDF8C) << 15) ^ eax;
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eax = (eax >> 18) ^ eax;
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return eax;
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}
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}
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public static uint EncodePassPhrase (string password)
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{
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byte[] pass_bytes = Encodings.cp932.GetBytes (password);
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uint key = 0xffffffff;
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foreach (var c in pass_bytes)
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{
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uint val = (uint)c << 24;
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key ^= val;
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for (int i = 0; i < 8; ++i)
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{
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bool carry = 0 != (key & 0x80000000);
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key <<= 1;
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if (carry)
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key ^= 0x4C11DB7;
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}
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key = ~key;
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}
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return key;
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}
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public struct KeyData
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{
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public uint Key;
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public string Passphrase;
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}
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public static readonly Dictionary<string, KeyData> KnownSchemes = new Dictionary<string, KeyData> {
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{ "Grisaia no Kajitsu", new KeyData { Key=0x1DAD9120, Passphrase="FW-6JD55162" }},
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{ "Shukufuku no Campanella", new KeyData { Key=0x4260E643, Passphrase="CAMPANELLA" }},
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{ "Makai Tenshi Djibril -Episode 4-", new KeyData { Key=0xA5A166AA, Passphrase="FW_MAKAI-TENSHI_DJIBRIL4" }},
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{ "Sengoku Tenshi Djibril (trial)", new KeyData { Key=0xef870610, Passphrase="FW-8O9B6WDS" }},
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};
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uint? QueryEncryptionInfo ()
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{
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var widget = new GUI.WidgetINT (Settings.Default.INTEncryption ?? new IntEncryptionInfo());
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var args = new ParametersRequestEventArgs
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{
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Notice = arcStrings.INTNotice,
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InputWidget = widget,
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};
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FormatCatalog.Instance.InvokeParametersRequest (this, args);
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if (!args.InputResult)
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throw new OperationCanceledException();
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Settings.Default.INTEncryption = widget.Info;
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return widget.GetKey();
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}
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public override ResourceOptions GetOptions ()
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{
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return new ResourceOptions {
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Widget = new GUI.WidgetINT (Settings.Default.INTEncryption ?? new IntEncryptionInfo())
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};
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}
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}
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}
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