mirror of
https://github.com/crskycode/GARbro.git
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517 lines
20 KiB
C#
517 lines
20 KiB
C#
//! \file ArcCPZ.cs
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//! \date Tue Nov 24 11:27:23 2015
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//! \brief Purple Software resource archive.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Linq;
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using GameRes.Utility;
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using System.Security.Cryptography;
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namespace GameRes.Formats.Purple
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{
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[Serializable]
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public class CmvsScheme
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{
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public uint[] Cpz5Secret;
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public Cmvs.Md5Variant Md5Variant;
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public uint DecoderFactor;
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public uint EntryInitKey;
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public byte EntryTailKey;
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}
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internal class CpzEntry : Entry
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{
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public uint CheckSum;
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public uint Key;
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public uint DirKey;
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}
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internal class CpzHeader
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{
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public int DirCount;
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public int DirEntriesSize;
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public int FileEntriesSize;
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public uint[] CmvsMd5 = new uint[4];
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public uint MasterKey;
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public bool IsEncrypted;
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public bool IsCompressed;
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}
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internal class CpzArchive : ArcFile
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{
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public CpzHeader Header;
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public Cpz5Decoder Decoder;
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public CpzArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, CpzHeader header, Cpz5Decoder decoder)
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: base (arc, impl, dir)
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{
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Header = header;
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Decoder = decoder;
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}
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}
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[Serializable]
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public class CpzScheme : ResourceScheme
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{
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public Dictionary<string, CmvsScheme> KnownSchemes;
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}
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[Export(typeof(ArchiveFormat))]
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public class CpzOpener : ArchiveFormat
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{
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public override string Tag { get { return "CPZ"; } }
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public override string Description { get { return "Purple Software resource archive"; } }
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public override uint Signature { get { return 0x355A5043; } } // 'CPZ5'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return false; } }
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public static Dictionary<string, CmvsScheme> KnownSchemes = new Dictionary<string, CmvsScheme>();
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public override ResourceScheme Scheme
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{
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get { return new CpzScheme { KnownSchemes = KnownSchemes }; }
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set { KnownSchemes = ((CpzScheme)value).KnownSchemes; }
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (null == KnownSchemes)
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throw new OperationCanceledException ("Outdated encryption schemes database");
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var header = file.View.ReadBytes (0, 0x3C);
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var checksum = file.View.ReadUInt32 (0x3C);
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if (checksum != CheckSum (header, 0, 0x3C, 0x923A564Cu))
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return null;
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var cpz = new CpzHeader
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{
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DirCount = -0x1C5AC27 ^ LittleEndian.ToInt32 (header, 4),
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DirEntriesSize = 0x37F298E7 ^ LittleEndian.ToInt32 (header, 8),
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FileEntriesSize = 0x7A6F3A2C ^ LittleEndian.ToInt32 (header, 0x0C),
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MasterKey = 0xAE7D39BF ^ LittleEndian.ToUInt32 (header, 0x30),
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IsEncrypted = 0 != (0xFB73A955 ^ LittleEndian.ToUInt32 (header, 0x34)),
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IsCompressed = 0 != (0x37ACF831 ^ LittleEndian.ToUInt32 (header, 0x38)),
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};
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var cmvs_md5 = new uint[] {
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0x43DE7C19 ^ LittleEndian.ToUInt32 (header, 0x20),
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0xCC65F415 ^ LittleEndian.ToUInt32 (header, 0x24),
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0xD016A93C ^ LittleEndian.ToUInt32 (header, 0x28),
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0x97A3BA9A ^ LittleEndian.ToUInt32 (header, 0x2C),
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};
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int index_size = cpz.DirEntriesSize + cpz.FileEntriesSize;
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var index = file.View.ReadBytes (0x40, (uint)index_size);
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if (index.Length != index_size)
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return null;
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var md5 = MD5.Create();
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var hash = md5.ComputeHash (index);
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if (!header.Skip (0x10).Take (0x10).SequenceEqual (hash))
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return null;
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foreach (var scheme in KnownSchemes.Values)
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{
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// both CmvsMd5 and index will be altered by ReadIndex in decryption attempt
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Array.Copy (cmvs_md5, cpz.CmvsMd5, 4);
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var arc = ReadIndex (file, scheme, cpz, index);
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if (null != arc)
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return arc;
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file.View.Read (0x40, index, 0, (uint)index_size);
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}
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throw new UnknownEncryptionScheme();
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}
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ArcFile ReadIndex (ArcView file, CmvsScheme scheme, CpzHeader cpz, byte[] index)
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{
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var cmvs_md5 = Cmvs.MD5.Create (scheme.Md5Variant);
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cmvs_md5.Compute (cpz.CmvsMd5);
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DecryptIndexStage1 (index, cpz.MasterKey ^ 0x3795B39A, scheme.Cpz5Secret);
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var decoder = new Cpz5Decoder (scheme, cpz.MasterKey, cpz.CmvsMd5[1]);
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decoder.Decode (index, 0, cpz.DirEntriesSize, 0x3A);
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var key = new uint[4];
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key[0] = cpz.CmvsMd5[0] ^ (cpz.MasterKey + 0x76A3BF29);
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key[1] = cpz.CmvsMd5[1] ^ cpz.MasterKey;
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key[2] = cpz.CmvsMd5[2] ^ (cpz.MasterKey + 0x10000000);
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key[3] = cpz.CmvsMd5[3] ^ cpz.MasterKey;
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DecryptIndexDirectory (index, cpz.DirEntriesSize, key);
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decoder.Init (cpz.MasterKey, cpz.CmvsMd5[2]);
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int base_offset = 0x40 + index.Length;
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int dir_offset = 0;
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var dir = new List<Entry>();
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for (int i = 0; i < cpz.DirCount; ++i)
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{
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int dir_size = LittleEndian.ToInt32 (index, dir_offset);
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if (dir_size <= 0x10 || dir_size > index.Length)
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return null;
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int file_count = LittleEndian.ToInt32 (index, dir_offset+4);
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if (file_count >= 0x10000)
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return null;
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int entries_offset = LittleEndian.ToInt32 (index, dir_offset+8);
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uint dir_key = LittleEndian.ToUInt32 (index, dir_offset+0xC);
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var dir_name = Binary.GetCString (index, dir_offset+0x10, dir_size-0x10);
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int next_entries_offset;
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if (i + 1 == cpz.DirCount)
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next_entries_offset = cpz.FileEntriesSize;
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else
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next_entries_offset = LittleEndian.ToInt32 (index, dir_offset + dir_size + 8);
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int cur_entries_size = next_entries_offset - entries_offset;
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if (cur_entries_size <= 0)
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return null;
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int cur_offset = cpz.DirEntriesSize + entries_offset;
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int cur_entries_end = cur_offset + cur_entries_size;
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decoder.Decode (index, cur_offset, cur_entries_size, 0x7E);
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key[0] = cpz.CmvsMd5[0] ^ dir_key;
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key[1] = cpz.CmvsMd5[1] ^ (dir_key + 0x112233);
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key[2] = cpz.CmvsMd5[2] ^ dir_key;
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key[3] = cpz.CmvsMd5[3] ^ (dir_key + 0x34258765);
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DecryptIndexEntry (index, cur_offset, cur_entries_size, key);
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bool is_root_dir = dir_name == "root";
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dir.Capacity = dir.Count + file_count;
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for (int j = 0; j < file_count; ++j)
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{
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int entry_size = LittleEndian.ToInt32 (index, cur_offset);
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if (entry_size > index.Length || entry_size <= 0x18)
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return null;
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var name = Binary.GetCString (index, cur_offset+0x18, cur_entries_end-(cur_offset+0x18));
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if (!is_root_dir)
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name = Path.Combine (dir_name, name);
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var entry = FormatCatalog.Instance.Create<CpzEntry> (name);
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entry.Offset = LittleEndian.ToInt64 (index, cur_offset+4) + base_offset;
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entry.Size = LittleEndian.ToUInt32 (index, cur_offset+0xC);
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entry.CheckSum = LittleEndian.ToUInt32 (index, cur_offset+0x10);
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entry.Key = LittleEndian.ToUInt32 (index, cur_offset+0x14);
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entry.DirKey = dir_key;
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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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cur_offset += entry_size;
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}
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dir_offset += dir_size;
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}
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if (cpz.IsEncrypted)
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decoder.Init (cpz.CmvsMd5[3], cpz.MasterKey);
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return new CpzArchive (file, this, dir, cpz, decoder);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var carc = arc as CpzArchive;
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var cent = entry as CpzEntry;
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if (null == carc || null == cent)
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return base.OpenEntry (arc, entry);
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var data = carc.File.View.ReadBytes (entry.Offset, entry.Size);
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if (carc.Header.IsEncrypted)
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{
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uint key = (carc.Header.MasterKey ^ (cent.DirKey + cent.Key)) + (uint)carc.Header.DirCount - 0x5C29E87B;
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carc.Decoder.DecryptEntry (data, carc.Header.CmvsMd5, key);
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}
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if (data.Length > 0x30 && Binary.AsciiEqual (data, 0, "PS2A"))
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data = UnpackPs2 (data);
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else if (data.Length > 0x40 && Binary.AsciiEqual (data, 0, "PB3B"))
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DecryptPb3 (data);
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return new MemoryStream (data);
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}
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void DecryptIndexStage1 (byte[] data, uint key, uint[] secret)
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{
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var sectet_key = new uint[24];
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int secret_length = Math.Min (24, secret.Length);
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for (int i = 0; i < secret_length; ++i)
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sectet_key[i] = secret[i] - key;
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uint shift = key;
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shift = (shift >> 8) ^ key;
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shift = (shift >> 8) ^ key;
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shift = (shift >> 8) ^ key;
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shift = (shift >> 8) ^ key;
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shift = ((shift ^ 0xB) & 0xF) + 7;
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unsafe
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{
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fixed (byte* raw = data)
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{
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uint* data32 = (uint*)raw;
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int i = 5;
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for (int n = data.Length / 4; n > 0; --n)
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{
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*data32 = Binary.RotR ((sectet_key[i] ^ *data32) + 0x784C5962, (int)shift) + 0x01010101;
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++data32;
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i = (i + 1) % 24;
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}
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byte* data8 = (byte*)data32;
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for (int n = data.Length & 3; n > 0; --n)
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{
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*data8 = (byte)((*data8 ^ (sectet_key[i] >> (n * 4))) - 0x79);
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++data8;
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i = (i + 1) % 24;
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}
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}
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}
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}
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void DecryptIndexDirectory (byte[] data, int length, uint[] key)
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{
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uint seed = 0x76548AEF;
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unsafe
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{
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fixed (byte* raw = data)
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{
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uint* data32 = (uint*)raw;
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int i;
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for (i = 0; i < length / 4; ++i)
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{
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*data32 = Binary.RotL ((*data32 ^ key[i & 3]) - 0x4A91C262, 3) - seed;
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++data32;
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seed += 0x10FB562A;
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}
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byte* data8 = (byte*)data32;
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for (int j = length & 3; j > 0; --j)
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{
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*data8 = (byte)((*data8 ^ (key[i++ & 3] >> 6)) + 0x37);
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++data8;
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}
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}
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}
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}
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void DecryptIndexEntry (byte[] data, int offset, int length, uint[] key)
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{
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if (offset < 0 || offset > data.Length)
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throw new ArgumentOutOfRangeException ("offset");
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if (length < 0 || length > data.Length || length > data.Length-offset)
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throw new ArgumentException ("length");
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uint seed = 0x2A65CB4E;
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unsafe
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{
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fixed (byte* raw = &data[offset])
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{
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uint* data32 = (uint*)raw;
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int i;
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for (i = 0; i < length / 4; ++i)
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{
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*data32 = Binary.RotL ((*data32 ^ key[i & 3]) - seed, 2) + 0x37A19E8B;
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++data32;
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seed -= 0x139FA9B;
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}
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byte* data8 = (byte*)data32;
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for (int j = length & 3; j > 0; --j)
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{
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*data8 = (byte)((*data8 ^ (key[i++ & 3] >> 4)) + 5);
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++data8;
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}
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}
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}
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}
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public static uint CheckSum (byte[] data, int index, int length, uint crc)
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{
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if (null == data)
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throw new ArgumentNullException ("data");
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if (index < 0 || index > data.Length)
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throw new ArgumentOutOfRangeException ("index");
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if (length < 0 || length > data.Length || length > data.Length-index)
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throw new ArgumentException ("length");
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int dwords = length / 4;
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if (dwords > 0)
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{
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unsafe
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{
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fixed (byte* raw = &data[index])
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{
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uint* raw32 = (uint*)raw;
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for (int i = 0; i < dwords; ++i)
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crc += raw32[i];
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}
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}
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index += length & -4;
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}
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for (int i = 0; i < (length & 3); ++i)
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crc += data[index+i];
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return crc;
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}
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byte[] UnpackPs2 (byte[] data)
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{
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DecryptPs2 (data);
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byte[] frame = new byte[0x800];
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int frame_pos = 0x7DF;
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int unpacked_size = LittleEndian.ToInt32 (data, 0x28);
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byte[] output = new byte[0x30+unpacked_size];
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Buffer.BlockCopy (data, 0, output, 0, 0x30);
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int src = 0x30;
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int dst = 0x30;
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int ctl = 1;
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while (dst < output.Length && src < data.Length)
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{
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if (1 == ctl)
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ctl = data[src++] | 0x100;
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if (0 != (ctl & 1))
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{
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byte b = data[src++];
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output[dst++] = b;
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frame[frame_pos++] = b;
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frame_pos &= 0x7FF;
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}
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else
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{
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int lo = data[src++];
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int hi = data[src++];
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int offset = lo | (hi & 0xE0) << 3;
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int count = (hi & 0x1F) + 2;
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for (int i = 0; i < count; ++i)
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{
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byte b = frame[(offset + i) & 0x7FF];
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output[dst++] = b;
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frame[frame_pos++] = b;
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frame_pos &= 0x7FF;
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}
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}
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ctl >>= 1;
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}
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return output;
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}
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void DecryptPs2 (byte[] data)
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{
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uint key = LittleEndian.ToUInt32 (data, 12);
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int shift = (int)(key >> 20) % 5 + 1;
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key = (key >> 24) + (key >> 3);
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for (int i = 0x30; i < data.Length; ++i)
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{
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data[i] = Binary.RotByteR ((byte)(key ^ (data[i] - 0x7Cu)), shift);
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}
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}
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void DecryptPb3 (byte[] data)
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{
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byte key1 = data[data.Length-3];
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byte key2 = data[data.Length-2];
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int src = data.Length - 0x2F;
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for (int i = 8; i < 0x34; i += 2)
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{
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data[i ] ^= key1;
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data[i ] -= data[src++];
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data[i+1] ^= key2;
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data[i+1] -= data[src++];
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}
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}
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}
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internal class Cpz5Decoder
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{
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protected byte[] m_decode_table = new byte[0x100];
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protected CmvsScheme m_scheme;
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public Cpz5Decoder (CmvsScheme scheme, uint key, uint summand)
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{
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m_scheme = scheme;
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Init (key, summand);
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}
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public void Init (uint key, uint summand)
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{
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for (int i = 0; i < 0x100; ++i)
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m_decode_table[i] = (byte)i;
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for (int i = 0; i < 0x100; ++i)
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{
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uint i0 = (key >> 16) & 0xFF;
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uint i1 = key & 0xFF;
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var tmp = m_decode_table[i0];
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m_decode_table[i0] = m_decode_table[i1];
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m_decode_table[i1] = tmp;
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i0 = (key >> 8) & 0xFF;
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i1 = key >> 24;
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tmp = m_decode_table[i0];
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m_decode_table[i0] = m_decode_table[i1];
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m_decode_table[i1] = tmp;
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key = summand + m_scheme.DecoderFactor * Binary.RotR (key, 2);
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}
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}
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public void Decode (byte[] data, int offset, int length, byte key)
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{
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for (int i = 0; i < length; ++i)
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data[offset+i] = m_decode_table[key ^ data[offset+i]];
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}
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public void DecryptEntry (byte[] data, uint[] cmvs_md5, uint seed)
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{
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if (null == data)
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|
throw new ArgumentNullException ("data");
|
|
if (null == cmvs_md5 || cmvs_md5.Length < 4)
|
|
throw new ArgumentException ("cmvs_md5");
|
|
|
|
int secret_length = Math.Min (m_scheme.Cpz5Secret.Length, 0x10) * sizeof(uint);
|
|
byte[] key_bytes = new byte[secret_length];
|
|
uint[] secret_key = new uint[0x10];
|
|
|
|
uint key = cmvs_md5[1] >> 2;
|
|
Buffer.BlockCopy (m_scheme.Cpz5Secret, 0, key_bytes, 0, secret_length);
|
|
for (int i = 0; i < secret_length; ++i)
|
|
key_bytes[i] = (byte)(key ^ m_decode_table[key_bytes[i]]);
|
|
|
|
Buffer.BlockCopy (key_bytes, 0, secret_key, 0, secret_length);
|
|
for (int i = 0; i < secret_key.Length; ++i)
|
|
secret_key[i] ^= seed;
|
|
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = data)
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
key = m_scheme.EntryInitKey;
|
|
int k = 9;
|
|
for (int i = data.Length / 4; i > 0; --i)
|
|
{
|
|
*data32 = cmvs_md5[key & 3] ^ ((*data32 ^ secret_key[(key >> 6) & 0xf] ^ (secret_key[k] >> 1)) - seed);
|
|
k = (k + 1) & 0xf;
|
|
key += seed + *data32++;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int i = data.Length & 3; i > 0; --i)
|
|
{
|
|
*data8 = m_decode_table[*data8 ^ m_scheme.EntryTailKey];
|
|
++data8;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|