mirror of
https://github.com/crskycode/GARbro.git
synced 2024-11-27 15:44:00 +08:00
756 lines
29 KiB
C#
756 lines
29 KiB
C#
//! \file ArcCPZ.cs
|
|
//! \date Tue Nov 24 11:27:23 2015
|
|
//! \brief Purple Software resource archive.
|
|
//
|
|
// Copyright (C) 2015-2019 by morkt
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to
|
|
// deal in the Software without restriction, including without limitation the
|
|
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
// sell copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
// IN THE SOFTWARE.
|
|
//
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.ComponentModel.Composition;
|
|
using System.IO;
|
|
using System.Linq;
|
|
using GameRes.Utility;
|
|
|
|
namespace GameRes.Formats.Purple
|
|
{
|
|
[Serializable]
|
|
public class CmvsScheme
|
|
{
|
|
public int Version;
|
|
public uint[] Cpz5Secret;
|
|
public Cmvs.Md5Variant Md5Variant;
|
|
public uint DecoderFactor;
|
|
public uint EntryInitKey;
|
|
public uint EntrySubKey = 0x5C29E87B;
|
|
public byte EntryTailKey;
|
|
public byte EntryKeyPos = 9;
|
|
public uint IndexSeed = 0x2A65CB4E;
|
|
public uint IndexAddend = 0x784C5962;
|
|
public uint IndexSubtrahend = 0x79;
|
|
public uint[] DirKeyAddend = DefaultDirKeyAddend;
|
|
|
|
static readonly uint[] DefaultDirKeyAddend = { 0, 0x00112233, 0, 0x34258765 };
|
|
}
|
|
|
|
internal class CpzEntry : Entry
|
|
{
|
|
public uint CheckSum;
|
|
public uint Key;
|
|
}
|
|
|
|
internal class CpzArchive : ArcFile
|
|
{
|
|
public CpzHeader Header;
|
|
public Cpz5Decoder Decoder;
|
|
public ArchiveKey Key;
|
|
|
|
public CpzArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, CpzHeader header, Cpz5Decoder decoder, ArchiveKey key)
|
|
: base (arc, impl, dir)
|
|
{
|
|
Header = header;
|
|
Decoder = decoder;
|
|
Key = key;
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class CpzScheme : ResourceScheme
|
|
{
|
|
public Dictionary<string, CmvsScheme> KnownSchemes;
|
|
}
|
|
|
|
[Export(typeof(ArchiveFormat))]
|
|
public class CpzOpener : ArchiveFormat
|
|
{
|
|
public override string Tag { get { return "CPZ"; } }
|
|
public override string Description { get { return "CMVS engine resource archive"; } }
|
|
public override uint Signature { get { return 0x355A5043; } } // 'CPZ5'
|
|
public override bool IsHierarchic { get { return true; } }
|
|
public override bool CanWrite { get { return false; } }
|
|
|
|
public CpzOpener ()
|
|
{
|
|
Signatures = new uint[] { 0x355A5043, 0x365A5043, 0x375A5043 };
|
|
}
|
|
|
|
static CpzScheme DefaultScheme = new CpzScheme();
|
|
|
|
internal Dictionary<string, CmvsScheme> KnownSchemes { get { return DefaultScheme.KnownSchemes; } }
|
|
|
|
public override ResourceScheme Scheme
|
|
{
|
|
get { return DefaultScheme; }
|
|
set { DefaultScheme = (CpzScheme)value; }
|
|
}
|
|
|
|
public override ArcFile TryOpen (ArcView file)
|
|
{
|
|
if (null == KnownSchemes)
|
|
throw new OperationCanceledException ("Outdated encryption schemes database");
|
|
|
|
var cpz = CpzHeader.Parse (file);
|
|
if (null == cpz)
|
|
return null;
|
|
|
|
var index = file.View.ReadBytes (cpz.IndexOffset, cpz.IndexSize);
|
|
if (!cpz.VerifyIndex (index))
|
|
return null;
|
|
|
|
int file_table_size = cpz.DirEntriesSize + cpz.FileEntriesSize;
|
|
if (cpz.IndexKeySize > 24)
|
|
{
|
|
var index_key = UnpackIndexKey (index, file_table_size, cpz.IndexKeySize);
|
|
for (int i = 0; i < file_table_size; ++i)
|
|
{
|
|
index[i] ^= index_key[(i + 3) % 0x3FF];
|
|
}
|
|
}
|
|
|
|
ArchiveKey arc_key = null;
|
|
if (cpz.Version > 6)
|
|
arc_key = FindArchiveKey (file.Name);
|
|
if (null == arc_key)
|
|
arc_key = new ArchiveKey();
|
|
|
|
var index_copy = new CowArray<byte> (index, 0, file_table_size).ToArray();
|
|
var cmvs_md5 = cpz.CmvsMd5.Clone() as uint[];
|
|
foreach (var scheme in KnownSchemes.Values.Where (s => s.Version == cpz.Version))
|
|
{
|
|
var arc = ReadIndex (file, scheme, cpz, index, arc_key);
|
|
if (null != arc)
|
|
return arc;
|
|
// both CmvsMd5 and index was altered by ReadIndex in decryption attempt
|
|
Array.Copy (cmvs_md5, cpz.CmvsMd5, 4);
|
|
Array.Copy (index, index_copy, file_table_size);
|
|
}
|
|
throw new UnknownEncryptionScheme();
|
|
}
|
|
|
|
internal ArcFile ReadIndex (ArcView file, CmvsScheme scheme, CpzHeader cpz, byte[] index, ArchiveKey arc_key)
|
|
{
|
|
var cmvs_md5 = Cmvs.MD5.Create (scheme.Md5Variant);
|
|
cmvs_md5.Compute (cpz.CmvsMd5);
|
|
|
|
DecryptIndexStage1 (index, cpz.MasterKey ^ 0x3795B39A, scheme);
|
|
|
|
var decoder = new Cpz5Decoder (scheme, cpz.MasterKey, cpz.CmvsMd5[1]);
|
|
decoder.Decode (index, 0, cpz.DirEntriesSize, 0x3A);
|
|
|
|
var key = new uint[4];
|
|
key[0] = cpz.CmvsMd5[0] ^ (cpz.MasterKey + 0x76A3BF29);
|
|
key[1] = cpz.CmvsMd5[1] ^ cpz.MasterKey;
|
|
key[2] = cpz.CmvsMd5[2] ^ (cpz.MasterKey + 0x10000000);
|
|
key[3] = cpz.CmvsMd5[3] ^ cpz.MasterKey;
|
|
|
|
DecryptIndexDirectory (index, cpz.DirEntriesSize, key, arc_key.IndexDirKey);
|
|
|
|
decoder.Init (cpz.MasterKey, cpz.CmvsMd5[2]);
|
|
uint base_offset = cpz.IndexOffset + cpz.IndexSize;
|
|
int dir_offset = 0;
|
|
var dir = new List<Entry>();
|
|
for (int i = 0; i < cpz.DirCount; ++i)
|
|
{
|
|
int dir_size = LittleEndian.ToInt32 (index, dir_offset);
|
|
if (dir_size <= 0x10 || dir_size > index.Length)
|
|
return null;
|
|
int file_count = LittleEndian.ToInt32 (index, dir_offset+4);
|
|
if (file_count >= 0x10000)
|
|
return null;
|
|
int entries_offset = LittleEndian.ToInt32 (index, dir_offset+8);
|
|
uint dir_key = LittleEndian.ToUInt32 (index, dir_offset+0xC);
|
|
var dir_name = Binary.GetCString (index, dir_offset+0x10, dir_size-0x10);
|
|
|
|
int next_entries_offset;
|
|
if (i + 1 == cpz.DirCount)
|
|
next_entries_offset = cpz.FileEntriesSize;
|
|
else
|
|
next_entries_offset = LittleEndian.ToInt32 (index, dir_offset + dir_size + 8);
|
|
|
|
int cur_entries_size = next_entries_offset - entries_offset;
|
|
if (cur_entries_size <= 0)
|
|
return null;
|
|
|
|
int cur_offset = cpz.DirEntriesSize + entries_offset;
|
|
int cur_entries_end = cur_offset + cur_entries_size;
|
|
decoder.Decode (index, cur_offset, cur_entries_size, 0x7E);
|
|
|
|
for (int j = 0; j < 4; ++j)
|
|
key[j] = cpz.CmvsMd5[j] ^ (dir_key + scheme.DirKeyAddend[j]);
|
|
|
|
DecryptIndexEntry (index, cur_offset, cur_entries_size, key, scheme.IndexSeed, arc_key.IndexEntryKey);
|
|
bool is_root_dir = dir_name == "root";
|
|
|
|
dir.Capacity = dir.Count + file_count;
|
|
for (int j = 0; j < file_count; ++j)
|
|
{
|
|
int entry_size = LittleEndian.ToInt32 (index, cur_offset);
|
|
if (entry_size > index.Length || entry_size <= cpz.EntryNameOffset)
|
|
return null;
|
|
int name_offset = cur_offset + cpz.EntryNameOffset;
|
|
var name = Binary.GetCString (index, name_offset, cur_entries_end - name_offset);
|
|
if (!is_root_dir)
|
|
name = Path.Combine (dir_name, name);
|
|
var entry = FormatCatalog.Instance.Create<CpzEntry> (name);
|
|
entry.Offset = LittleEndian.ToInt64 (index, cur_offset+4) + base_offset;
|
|
entry.Size = LittleEndian.ToUInt32 (index, cur_offset+0xC);
|
|
int key_offset = cur_offset + 0x10;
|
|
if (cpz.IsLongSize)
|
|
key_offset += 4;
|
|
entry.CheckSum = LittleEndian.ToUInt32 (index, key_offset);
|
|
entry.Key = LittleEndian.ToUInt32 (index, key_offset+4) + dir_key;
|
|
if (!entry.CheckPlacement (file.MaxOffset))
|
|
return null;
|
|
dir.Add (entry);
|
|
cur_offset += entry_size;
|
|
}
|
|
dir_offset += dir_size;
|
|
}
|
|
if (cpz.IsEncrypted)
|
|
decoder.Init (cpz.CmvsMd5[3], cpz.MasterKey);
|
|
return new CpzArchive (file, this, dir, cpz, decoder, arc_key);
|
|
}
|
|
|
|
public override Stream OpenEntry (ArcFile arc, Entry entry)
|
|
{
|
|
var carc = arc as CpzArchive;
|
|
var cent = entry as CpzEntry;
|
|
if (null == carc || null == cent)
|
|
return base.OpenEntry (arc, entry);
|
|
|
|
var data = carc.File.View.ReadBytes (entry.Offset, entry.Size);
|
|
if (carc.Header.IsEncrypted)
|
|
{
|
|
uint key = (carc.Header.MasterKey ^ cent.Key) + (uint)carc.Header.DirCount;
|
|
key ^= carc.Key.EntryDataKey2;
|
|
key -= carc.Decoder.Scheme.EntrySubKey;
|
|
key ^= carc.Header.EntryKey + carc.Key.EntryDataKey1;
|
|
carc.Decoder.DecryptEntry (data, carc.Header.CmvsMd5, key);
|
|
}
|
|
if (data.Length > 0x30 && Binary.AsciiEqual (data, 0, "PS2A"))
|
|
data = UnpackPs2 (data);
|
|
else if (data.Length > 0x40 && Binary.AsciiEqual (data, 0, "PB3B"))
|
|
DecryptPb3 (data);
|
|
return new BinMemoryStream (data, entry.Name);
|
|
}
|
|
|
|
internal byte[] UnpackIndexKey (byte[] data, int offset, int length)
|
|
{
|
|
int key_offset = offset + 20;
|
|
int packed_offset = offset + 24;
|
|
int packed_length = length - 24;
|
|
for (int i = 0; i < packed_length; ++i)
|
|
{
|
|
data[packed_offset + i] ^= data[key_offset + (i & 3)];
|
|
}
|
|
int unpacked_length = data.ToInt32 (offset + 16);
|
|
var output = new byte[unpacked_length];
|
|
var decoder = new HuffmanDecoder (data, packed_offset, packed_length, output);
|
|
return decoder.Unpack();
|
|
}
|
|
|
|
void DecryptIndexStage1 (byte[] data, uint key, CmvsScheme scheme)
|
|
{
|
|
var secret = scheme.Cpz5Secret;
|
|
var secret_key = new uint[24];
|
|
int secret_length = Math.Min (24, secret.Length);
|
|
for (int i = 0; i < secret_length; ++i)
|
|
secret_key[i] = secret[i] - key;
|
|
|
|
int shift = (int)(((key >> 24) ^ (key >> 16) ^ (key >> 8) ^ key ^ 0xB) & 0xF) + 7;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = data)
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
int i = 5;
|
|
for (int n = data.Length / 4; n > 0; --n)
|
|
{
|
|
*data32 = Binary.RotR ((secret_key[i] ^ *data32) + scheme.IndexAddend, shift) + 0x01010101;
|
|
++data32;
|
|
i = (i + 1) % 24;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int n = data.Length & 3; n > 0; --n)
|
|
{
|
|
*data8 = (byte)((*data8 ^ (secret_key[i] >> (n * 4))) - scheme.IndexSubtrahend);
|
|
++data8;
|
|
i = (i + 1) % 24;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void EncryptIndexStage1 (byte[] data, uint key, CmvsScheme scheme)
|
|
{
|
|
var secret = scheme.Cpz5Secret;
|
|
var secret_key = new uint[24];
|
|
int secret_length = Math.Min(24, secret.Length);
|
|
for (int i = 0; i < secret_length; ++i)
|
|
secret_key[i] = secret[i] - key;
|
|
|
|
int shift = (int)(((key >> 24) ^ (key >> 16) ^ (key >> 8) ^ key ^ 0xB) & 0xF) + 7;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = data)
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
int i = 5;
|
|
for (int n = data.Length / 4; n > 0; --n)
|
|
{
|
|
*data32 = (Binary.RotL((*data32 - 0x01010101), shift) - scheme.IndexAddend) ^ secret_key[i];
|
|
++data32;
|
|
i = (i + 1) % 24;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int n = data.Length & 3; n > 0; --n)
|
|
{
|
|
*data8 = (byte)((*data8 + scheme.IndexSubtrahend) ^ (secret_key[i] >> (n * 4)));
|
|
++data8;
|
|
i = (i + 1) % 24;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void DecryptIndexDirectory (byte[] data, int length, uint[] key, uint arc_key)
|
|
{
|
|
uint seed = 0x76548AEF;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = data)
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
int i;
|
|
for (i = 0; i < length / 4; ++i)
|
|
{
|
|
*data32 = Binary.RotL ((*data32 ^ key[i & 3]) - 0x4A91C262, 3) - seed;
|
|
++data32;
|
|
seed += 0x10FB562Au ^ arc_key;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int j = length & 3; j > 0; --j)
|
|
{
|
|
*data8 = (byte)((*data8 ^ (key[i++ & 3] >> 6)) + 0x37);
|
|
++data8;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void EncryptIndexDirectory (byte[] data, int length, uint[] key)
|
|
{
|
|
uint seed = 0x76548AEF;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = data)
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
int i;
|
|
for (i = 0; i < length / 4; ++i)
|
|
{
|
|
*data32 = (Binary.RotR(*data32 + seed, 3) + 0x4A91C262) ^ key[i & 3];
|
|
++data32;
|
|
seed += 0x10FB562A;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int j = length & 3; j > 0; --j)
|
|
{
|
|
*data8 = (byte)((*data8 - 0x37) ^ (key[i++ & 3] >> 6));
|
|
++data8;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void DecryptIndexEntry (byte[] data, int offset, int length, uint[] key, uint seed, uint arc_key)
|
|
{
|
|
if (offset < 0 || offset > data.Length)
|
|
throw new ArgumentOutOfRangeException ("offset");
|
|
if (length < 0 || length > data.Length || length > data.Length-offset)
|
|
throw new ArgumentException ("length");
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = &data[offset])
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
int i;
|
|
for (i = 0; i < length / 4; ++i)
|
|
{
|
|
*data32 = Binary.RotL ((*data32 ^ key[i & 3]) - seed, 2) + 0x37A19E8B;
|
|
++data32;
|
|
seed -= 0x139FA9B ^ arc_key;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int j = length & 3; j > 0; --j)
|
|
{
|
|
*data8 = (byte)((*data8 ^ (key[i++ & 3] >> 4)) + 5);
|
|
++data8;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void EncryptIndexEntry (byte[] data, int offset, int length, uint[] key, uint seed)
|
|
{
|
|
if (offset < 0 || offset > data.Length)
|
|
throw new ArgumentOutOfRangeException("offset");
|
|
if (length < 0 || length > data.Length || length > data.Length - offset)
|
|
throw new ArgumentException("length");
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = &data[offset])
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
int i;
|
|
for (i = 0; i < length / 4; ++i)
|
|
{
|
|
*data32 = (Binary.RotR((*data32 - 0x37A19E8B), 2) + seed) ^ key[i & 3];
|
|
++data32;
|
|
seed -= 0x139FA9B;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int j = length & 3; j > 0; --j)
|
|
{
|
|
*data8 = (byte)((*data8 - 5) ^ (key[i++ & 3] >> 4));
|
|
++data8;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
byte[] UnpackPs2 (byte[] data)
|
|
{
|
|
DecryptPs2 (data);
|
|
return UnpackLzss (data);
|
|
}
|
|
|
|
internal static byte[] UnpackLzss (byte[] data)
|
|
{
|
|
byte[] frame = new byte[0x800];
|
|
int frame_pos = 0x7DF;
|
|
int unpacked_size = LittleEndian.ToInt32 (data, 0x28);
|
|
byte[] output = new byte[0x30+unpacked_size];
|
|
Buffer.BlockCopy (data, 0, output, 0, 0x30);
|
|
int src = 0x30;
|
|
int dst = 0x30;
|
|
int ctl = 1;
|
|
while (dst < output.Length && src < data.Length)
|
|
{
|
|
if (1 == ctl)
|
|
ctl = data[src++] | 0x100;
|
|
if (0 != (ctl & 1))
|
|
{
|
|
byte b = data[src++];
|
|
output[dst++] = b;
|
|
frame[frame_pos++] = b;
|
|
frame_pos &= 0x7FF;
|
|
}
|
|
else
|
|
{
|
|
int lo = data[src++];
|
|
int hi = data[src++];
|
|
int offset = lo | (hi & 0xE0) << 3;
|
|
int count = (hi & 0x1F) + 2;
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
byte b = frame[(offset + i) & 0x7FF];
|
|
output[dst++] = b;
|
|
frame[frame_pos++] = b;
|
|
frame_pos &= 0x7FF;
|
|
}
|
|
}
|
|
ctl >>= 1;
|
|
}
|
|
return output;
|
|
}
|
|
|
|
void DecryptPs2 (byte[] data)
|
|
{
|
|
uint key = LittleEndian.ToUInt32 (data, 12);
|
|
int shift = (int)(key >> 20) % 5 + 1;
|
|
key = (key >> 24) + (key >> 3);
|
|
for (int i = 0x30; i < data.Length; ++i)
|
|
{
|
|
data[i] = Binary.RotByteR ((byte)(key ^ (data[i] - 0x7Cu)), shift);
|
|
}
|
|
}
|
|
|
|
void DecryptPb3 (byte[] data)
|
|
{
|
|
byte key1 = data[data.Length-3];
|
|
byte key2 = data[data.Length-2];
|
|
int src = data.Length - 0x2F;
|
|
for (int i = 8; i < 0x34; i += 2)
|
|
{
|
|
data[i ] ^= key1;
|
|
data[i ] -= data[src++];
|
|
data[i+1] ^= key2;
|
|
data[i+1] -= data[src++];
|
|
}
|
|
}
|
|
|
|
void EncryptPb3 (byte[] data)
|
|
{
|
|
byte key1 = data[data.Length - 3];
|
|
byte key2 = data[data.Length - 2];
|
|
int src = data.Length - 0x2F;
|
|
for (int i = 8; i < 0x34; i += 2)
|
|
{
|
|
data[i] += data[src++];
|
|
data[i] ^= key1;
|
|
data[i + 1] += data[src++];
|
|
data[i + 1] ^= key2;
|
|
}
|
|
}
|
|
|
|
ArchiveKey FindArchiveKey (string arc_name)
|
|
{
|
|
// look for "start.ps3" in the same directory as an archive
|
|
var start_name = VFS.ChangeFileName (arc_name, "start.ps3");
|
|
if (!VFS.FileExists (start_name))
|
|
return null;
|
|
byte[] start_data;
|
|
using (var start = VFS.OpenView (start_name))
|
|
{
|
|
if (!start.View.AsciiEqual (0, "PS2A"))
|
|
return null;
|
|
start_data = start.View.ReadBytes (0, (uint)start.MaxOffset);
|
|
}
|
|
arc_name = Path.GetFileName (arc_name);
|
|
start_data = UnpackPs2 (start_data);
|
|
|
|
int table_count = start_data.ToInt32 (0x10);
|
|
int strings_offset = 0x30 + table_count * 4 + start_data.ToInt32 (0x14);
|
|
int strings_size = start_data.ToInt32 (0x1C);
|
|
if (strings_offset < 0x30 || strings_offset + strings_size > start_data.Length)
|
|
return null;
|
|
|
|
// search strings table for archive name
|
|
int string_pos = strings_offset;
|
|
int strings_end = strings_offset + strings_size;
|
|
int arc_id = -1;
|
|
while (string_pos < strings_end)
|
|
{
|
|
int end_pos = Array.IndexOf<byte> (start_data, 0, string_pos);
|
|
if (-1 == end_pos)
|
|
end_pos = strings_offset + strings_size;
|
|
if (end_pos != string_pos)
|
|
{
|
|
var text = Encodings.cp932.GetString (start_data, string_pos, end_pos - string_pos);
|
|
if (VFS.IsPathEqualsToFileName (text, arc_name))
|
|
{
|
|
arc_id = string_pos - strings_offset;
|
|
break;
|
|
}
|
|
}
|
|
string_pos = end_pos + 1;
|
|
}
|
|
if (-1 == arc_id)
|
|
return null;
|
|
|
|
// search bytecode for a reference to archive name found above
|
|
var id_bytes = new byte[4];
|
|
LittleEndian.Pack (arc_id, id_bytes, 0);
|
|
for (int data_pos = 0x30 + table_count * 4; data_pos + 4 <= strings_offset; ++data_pos)
|
|
{
|
|
if (start_data[data_pos+0] == id_bytes[0] && start_data[data_pos+1] == id_bytes[1] &&
|
|
start_data[data_pos+2] == id_bytes[2] && start_data[data_pos+3] == id_bytes[3])
|
|
{
|
|
if (start_data[data_pos-0x33] == 2 && start_data[data_pos-0x32] == 0 &&
|
|
start_data[data_pos-0x31] == 1)
|
|
{
|
|
return new ArchiveKey {
|
|
IndexDirKey = start_data.ToUInt32 (data_pos-0x0C),
|
|
IndexEntryKey = start_data.ToUInt32 (data_pos-0x18),
|
|
EntryDataKey1 = start_data.ToUInt32 (data_pos-0x24),
|
|
EntryDataKey2 = start_data.ToUInt32 (data_pos-0x30),
|
|
};
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
}
|
|
|
|
internal class Cpz5Decoder
|
|
{
|
|
protected byte[] m_decode_table = new byte[0x100];
|
|
protected CmvsScheme m_scheme;
|
|
|
|
public CmvsScheme Scheme { get { return m_scheme; } }
|
|
|
|
public Cpz5Decoder (CmvsScheme scheme, uint key, uint summand)
|
|
{
|
|
m_scheme = scheme;
|
|
Init (key, summand);
|
|
}
|
|
|
|
public void Init (uint key, uint summand)
|
|
{
|
|
for (int i = 0; i < 0x100; ++i)
|
|
m_decode_table[i] = (byte)i;
|
|
|
|
for (int i = 0; i < 0x100; ++i)
|
|
{
|
|
uint i0 = (key >> 16) & 0xFF;
|
|
uint i1 = key & 0xFF;
|
|
var tmp = m_decode_table[i0];
|
|
m_decode_table[i0] = m_decode_table[i1];
|
|
m_decode_table[i1] = tmp;
|
|
|
|
i0 = (key >> 8) & 0xFF;
|
|
i1 = key >> 24;
|
|
tmp = m_decode_table[i0];
|
|
m_decode_table[i0] = m_decode_table[i1];
|
|
m_decode_table[i1] = tmp;
|
|
|
|
key = summand + m_scheme.DecoderFactor * Binary.RotR (key, 2);
|
|
}
|
|
}
|
|
|
|
public void Decode (byte[] data, int offset, int length, byte key)
|
|
{
|
|
for (int i = 0; i < length; ++i)
|
|
data[offset+i] = m_decode_table[key ^ data[offset+i]];
|
|
}
|
|
|
|
public void Encode (byte[] data, int offset, int length, byte key)
|
|
{
|
|
for (int i = 0; i < length; ++i)
|
|
{
|
|
for (int s = 0; s < m_decode_table.Length; s++)
|
|
{
|
|
if (data[offset+i] == m_decode_table[s])
|
|
{
|
|
data[offset+i] = (byte)(key ^ s);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public void DecryptEntry (byte[] data, uint[] cmvs_md5, uint seed)
|
|
{
|
|
if (null == data)
|
|
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 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]]);
|
|
|
|
uint[] secret_key = new uint[0x10];
|
|
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 = m_scheme.EntryKeyPos;
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public void EncryptEntry (byte[] data, uint[] cmvs_md5, uint seed)
|
|
{
|
|
if (null == data)
|
|
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 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]]);
|
|
|
|
uint[] secret_key = new uint[0x10];
|
|
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 = m_scheme.EntryKeyPos;
|
|
for (int i = data.Length / 4; i > 0; --i)
|
|
{
|
|
uint backup = *data32;
|
|
*data32 = (((cmvs_md5[key & 3] ^ *data32) + seed) ^ (secret_key[k] >> 1)) ^ secret_key[(key >> 6) & 0xf];
|
|
k = (k + 1) & 0xf;
|
|
key += seed + backup;
|
|
++data32;
|
|
}
|
|
byte* data8 = (byte*)data32;
|
|
for (int i = data.Length & 3; i > 0; --i)
|
|
{
|
|
for (int s = 0; s < m_decode_table.Length; s++)
|
|
{
|
|
if (*data8 == m_decode_table[s])
|
|
{
|
|
*data8 = (byte)(s ^ m_scheme.EntryTailKey);
|
|
break;
|
|
}
|
|
}
|
|
++data8;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class ArchiveKey
|
|
{
|
|
public uint IndexDirKey;
|
|
public uint IndexEntryKey;
|
|
public uint EntryDataKey1;
|
|
public uint EntryDataKey2;
|
|
}
|
|
}
|