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(CPZ): additional encryption for CPZ7 archives.

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morkt
2019-03-26 22:33:08 +04:00
parent be9abb385b
commit ec361833de
1 changed files with 103 additions and 15 deletions
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118
ArcFormats/Cmvs/ArcCPZ.cs
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@@ -2,7 +2,7 @@
//! \date Tue Nov 24 11:27:23 2015
//! \brief Purple Software resource archive.
//
// Copyright (C) 2015-2017 by morkt
// 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
@@ -61,12 +61,14 @@ namespace GameRes.Formats.Purple
{
public CpzHeader Header;
public Cpz5Decoder Decoder;
public ArchiveKey Key;
public CpzArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, CpzHeader header, Cpz5Decoder decoder)
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;
}
}
@@ -90,12 +92,14 @@ namespace GameRes.Formats.Purple
Signatures = new uint[] { 0x355A5043, 0x365A5043, 0x375A5043 };
}
public static Dictionary<string, CmvsScheme> KnownSchemes = new Dictionary<string, CmvsScheme>();
static CpzScheme DefaultScheme = new CpzScheme();
internal Dictionary<string, CmvsScheme> KnownSchemes { get { return DefaultScheme.KnownSchemes; } }
public override ResourceScheme Scheme
{
get { return new CpzScheme { KnownSchemes = KnownSchemes }; }
set { KnownSchemes = ((CpzScheme)value).KnownSchemes; }
get { return DefaultScheme; }
set { DefaultScheme = (CpzScheme)value; }
}
public override ArcFile TryOpen (ArcView file)
@@ -121,11 +125,17 @@ namespace GameRes.Formats.Purple
}
}
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);
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
@@ -135,7 +145,7 @@ namespace GameRes.Formats.Purple
throw new UnknownEncryptionScheme();
}
internal ArcFile ReadIndex (ArcView file, CmvsScheme scheme, CpzHeader cpz, byte[] index)
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);
@@ -151,7 +161,7 @@ namespace GameRes.Formats.Purple
key[2] = cpz.CmvsMd5[2] ^ (cpz.MasterKey + 0x10000000);
key[3] = cpz.CmvsMd5[3] ^ cpz.MasterKey;
DecryptIndexDirectory (index, cpz.DirEntriesSize, key);
DecryptIndexDirectory (index, cpz.DirEntriesSize, key, arc_key.IndexDirKey);
decoder.Init (cpz.MasterKey, cpz.CmvsMd5[2]);
uint base_offset = cpz.IndexOffset + cpz.IndexSize;
@@ -186,7 +196,7 @@ namespace GameRes.Formats.Purple
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);
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;
@@ -216,7 +226,7 @@ namespace GameRes.Formats.Purple
}
if (cpz.IsEncrypted)
decoder.Init (cpz.CmvsMd5[3], cpz.MasterKey);
return new CpzArchive (file, this, dir, cpz, decoder);
return new CpzArchive (file, this, dir, cpz, decoder, arc_key);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
@@ -230,8 +240,9 @@ namespace GameRes.Formats.Purple
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;
key ^= carc.Header.EntryKey + carc.Key.EntryDataKey1;
carc.Decoder.DecryptEntry (data, carc.Header.CmvsMd5, key);
}
if (data.Length > 0x30 && Binary.AsciiEqual (data, 0, "PS2A"))
@@ -320,7 +331,7 @@ namespace GameRes.Formats.Purple
}
}
void DecryptIndexDirectory (byte[] data, int length, uint[] key)
void DecryptIndexDirectory (byte[] data, int length, uint[] key, uint arc_key)
{
uint seed = 0x76548AEF;
unsafe
@@ -333,7 +344,7 @@ namespace GameRes.Formats.Purple
{
*data32 = Binary.RotL ((*data32 ^ key[i & 3]) - 0x4A91C262, 3) - seed;
++data32;
seed += 0x10FB562A;
seed += 0x10FB562Au ^ arc_key;
}
byte* data8 = (byte*)data32;
for (int j = length & 3; j > 0; --j)
@@ -370,7 +381,7 @@ namespace GameRes.Formats.Purple
}
}
void DecryptIndexEntry (byte[] data, int offset, int length, uint[] key, uint seed)
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");
@@ -386,7 +397,7 @@ namespace GameRes.Formats.Purple
{
*data32 = Binary.RotL ((*data32 ^ key[i & 3]) - seed, 2) + 0x37A19E8B;
++data32;
seed -= 0x139FA9B;
seed -= 0x139FA9B ^ arc_key;
}
byte* data8 = (byte*)data32;
for (int j = length & 3; j > 0; --j)
@@ -510,6 +521,74 @@ namespace GameRes.Formats.Purple
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
@@ -664,4 +743,13 @@ namespace GameRes.Formats.Purple
}
}
}
[Serializable]
public class ArchiveKey
{
public uint IndexDirKey;
public uint IndexEntryKey;
public uint EntryDataKey1;
public uint EntryDataKey2;
}
}