lifegpc/GARbro-crskycode
1
0
Fork 0
mirror of https://github.com/crskycode/GARbro.git synced 2026-07-08 01:30:18 +08:00
Code Issues Packages Projects Releases Wiki Activity

alternative encryption schemes for LPK archives.

Browse Source
This commit is contained in:
morkt
2015-04-25 02:07:14 +04:00
parent 0e18247492
commit 8ee82a8c31
9 changed files with 198 additions and 79 deletions
Download Patch File Download Diff File Expand all files Collapse all files

206
ArcFormats/ArcLPK.cs
View File

@@ -29,6 +29,7 @@ using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using System.Text;
using GameRes.Formats.Properties;
using GameRes.Formats.Strings;
using GameRes.Utility;
@@ -41,17 +42,28 @@ namespace GameRes.Formats.Lucifen
internal class LuciArchive : ArcFile
{
public LpkInfo Info;
public LpkInfo Info;
public EncryptionScheme Scheme;
public LuciArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, LpkInfo info)
public LuciArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, EncryptionScheme scheme, LpkInfo info)
: base (arc, impl, dir)
{
Info = info;
Scheme = scheme;
}
}
public class EncryptionScheme
{
public LpkOpener.Key BaseKey;
public byte ContentXor;
public uint RotatePattern;
public bool ImportGameInit;
}
internal class LuciOptions : ResourceOptions
{
public string Scheme;
public LpkOpener.Key Key;
}
@@ -85,11 +97,18 @@ namespace GameRes.Formats.Lucifen
}
}
static Key BaseKey = new Key (0xA5B9AC6B, 0x9A639DE5);
static byte[] ScriptName = Encoding.ASCII.GetBytes ("SCRIPT");
static Key ScriptKey = new Key (0, 0);
public static readonly Dictionary<string, EncryptionScheme> KnownSchemes =
new Dictionary<string, EncryptionScheme> {
{ "Default", new EncryptionScheme {
BaseKey = new Key (0xA5B9AC6B, 0x9A639DE5), ContentXor = 0x5d, RotatePattern = 0x31746285,
ImportGameInit = true } },
{ "Lycoris Radiata", new EncryptionScheme {
BaseKey = new Key (0x39A5B67D, 0xD63AB5E9), ContentXor = 0xa6, RotatePattern = 0x36147352,
ImportGameInit = false } },
};
Dictionary<string, Key> CurrentScheme = new Dictionary<string, Key>();
EncryptionScheme CurrentScheme = KnownSchemes["Default"];
Dictionary<string, Key> CurrentFileMap = new Dictionary<string, Key>();
static Dictionary<string, Dictionary<string, Key>> KnownKeys =
new Dictionary<string, Dictionary<string, Key>> {
@@ -118,23 +137,29 @@ namespace GameRes.Formats.Lucifen
string name = Path.GetFileName (file.Name).ToUpperInvariant();
if (string.IsNullOrEmpty (name))
return null;
var key = ScriptKey;
if (name != "SCRIPT.LPK" && !CurrentScheme.TryGetValue (name, out key))
{
try
{
ImportKeys (file.Name);
CurrentScheme.TryGetValue (name, out key);
}
catch
{
key = null;
}
if (null == key)
key = QueryEncryptionKey (name);
}
Key file_key = null;
var basename = Encodings.cp932.GetBytes (Path.GetFileNameWithoutExtension (name));
return Open (basename, file, key);
if (name != "SCRIPT.LPK")
CurrentFileMap.TryGetValue (name, out file_key);
try
{
var arc = Open (basename, file, CurrentScheme, file_key);
if (null != arc)
return arc;
}
catch { /* unknown encryption, ignore parse errors */ }
var new_scheme = QueryEncryptionScheme();
if (new_scheme == CurrentScheme && !CurrentScheme.ImportGameInit)
return null;
CurrentScheme = new_scheme;
if (name != "SCRIPT.LPK" && CurrentScheme.ImportGameInit)
{
if (0 == CurrentFileMap.Count)
ImportKeys (file.Name);
}
if (!CurrentFileMap.TryGetValue (name, out file_key) && CurrentScheme.ImportGameInit)
return null;
return Open (basename, file, CurrentScheme, file_key);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
@@ -165,34 +190,13 @@ namespace GameRes.Formats.Lucifen
}
if (larc.Info.WholeCrypt)
{
for (int i = 0; i < data.Length; ++i)
{
int v = data[i] ^ 0x5d;
data[i] = (byte)(v >> 4 | v << 4);
}
DecryptContent (data, larc.Scheme.ContentXor);
}
if (larc.Info.IsEncrypted)
{
int count = Math.Min (data.Length / 4, 0x40);
int count = Math.Min (data.Length, 0x100);
if (count != 0)
{
unsafe
{
fixed (byte* buf_raw = data)
{
uint key = larc.Info.Key;
uint* encoded = (uint*)buf_raw;
uint ecx = 0x31746285;
for (int i = 0; i < count; ++i)
{
encoded[i] ^= key;
ecx = (ecx >> 4) | (ecx << 28);
int cl = (int)(ecx & 0x1f);
key = (key << cl) | (key >> (32-cl));
}
}
}
}
DecryptEntry (data, count, larc.Info.Key, larc.Scheme.RotatePattern);
}
input = new MemoryStream (data);
if (null != larc.Info.Prefix)
@@ -201,10 +205,51 @@ namespace GameRes.Formats.Lucifen
return input;
}
ArcFile Open (byte[] basename, ArcView file, Key key)
static void DecryptContent (byte[] data, byte key)
{
uint key1 = BaseKey.Key1;
uint key2 = BaseKey.Key2;
for (int i = 0; i < data.Length; ++i)
{
int v = data[i] ^ key;
data[i] = (byte)(v >> 4 | v << 4);
}
}
static unsafe void DecryptEntry (byte[] data, int length, uint key, uint pattern)
{
fixed (byte* buf_raw = data)
{
uint* encoded = (uint*)buf_raw;
length /= 4;
for (int i = 0; i < length; ++i)
{
encoded[i] ^= key;
pattern = (pattern >> 4) | (pattern << 28);
int cl = (int)(pattern & 0x1f);
key = (key << cl) | (key >> (32-cl));
}
}
}
static unsafe void DecryptIndex (byte[] data, int length, uint key, uint pattern)
{
fixed (byte* buf_raw = data)
{
uint* encoded = (uint*)buf_raw;
length /= 4;
for (int i = 0; i < length; ++i)
{
encoded[i] ^= key;
pattern = (pattern << 4) | (pattern >> 28);
int cl = (int)(pattern & 0x1f);
key = (key >> cl) | (key << (32-cl));
}
}
}
ArcFile Open (byte[] basename, ArcView file, EncryptionScheme scheme, Key key)
{
uint key1 = scheme.BaseKey.Key1;
uint key2 = scheme.BaseKey.Key2;
for (int b = 0, e = basename.Length-1; e >= 0; ++b, --e)
{
key1 ^= basename[e];
@@ -212,18 +257,22 @@ namespace GameRes.Formats.Lucifen
key1 = (key1 << 25) | (key1 >> 7);
key2 = (key2 << 7) | (key2 >> 25);
}
key1 ^= key.Key1;
key2 ^= key.Key2;
if (null != key)
{
key1 ^= key.Key1;
key2 ^= key.Key2;
}
uint code = file.View.ReadUInt32 (4) ^ key2;
int index_size = (int)(code & 0xffffff);
byte flags = (byte)(code >> 24);
if (0 != (flags & 1))
index_size = (index_size << 11) - 8;
if (index_size < 5)
if (index_size < 5 || index_size >= file.MaxOffset)
return null;
var index = new byte[index_size];
if (index_size != file.View.Read (8, index, 0, (uint)index_size))
return null;
DecryptIndex (index, index_size, key2, scheme.RotatePattern);
var lpk_info = new LpkInfo
{
AlignedOffset = 0 != (flags & 1),
@@ -234,33 +283,22 @@ namespace GameRes.Formats.Lucifen
Key = key1
};
var reader = new IndexReader (lpk_info);
unsafe
{
fixed (byte* buf_raw = index)
{
uint* encoded = (uint*)buf_raw;
uint ecx = 0x31746285;
for (int i = 0; i < index_size/4; ++i)
{
encoded[i] ^= key2;
ecx = (ecx << 4) | (ecx >> 28);
int cl = (int)(ecx & 0x1f);
key2 = (key2 << (32-cl)) | (key2 >> cl);
}
}
}
var dir = reader.Read (index);
if (null == dir)
return null;
return new LuciArchive (file, this, dir, reader.Info);
return new LuciArchive (file, this, dir, scheme, reader.Info);
}
static readonly byte[] ScriptName = Encoding.ASCII.GetBytes ("SCRIPT");
void ImportKeys (string source_name)
{
var script_lpk = Path.Combine (Path.GetDirectoryName (source_name), "SCRIPT.LPK");
using (var script_file = new ArcView (script_lpk))
using (var script_arc = Open (ScriptName, script_file, ScriptKey))
using (var script_arc = Open (ScriptName, script_file, CurrentScheme, null))
{
if (null == script_arc)
throw new UnknownEncryptionScheme();
var entry = script_arc.Dir.Where (e => e.Name.Equals ("gameinit.sob", StringComparison.InvariantCultureIgnoreCase)).FirstOrDefault();
if (null == entry)
throw new FileNotFoundException ("Missing 'gameinit.sob' entry in SCRIPT.LPK");
@@ -276,7 +314,7 @@ namespace GameRes.Formats.Lucifen
bool ParseGameInit (byte[] sob)
{
CurrentScheme.Clear();
CurrentFileMap.Clear();
if (!Binary.AsciiEqual (sob, "SOB0"))
return false;
int offset = LittleEndian.ToInt32 (sob, 4) + 8;
@@ -304,14 +342,14 @@ namespace GameRes.Formats.Lucifen
{
byte* lpk = (byte*)p + p[21] - p[2] + 0x34;
int name_index = (int)(lpk - buf_raw);
if (name_index >= sob.Length)
if (name_index < 0 || name_index >= sob.Length)
{
++p;
continue;
}
string name = Binary.GetCString (sob, name_index, sob.Length-name_index);
name = name.ToUpperInvariant();
CurrentScheme[name] = new Key (p[8], p[10]);
CurrentFileMap[name] = new Key (p[8], p[10]);
p += 0x22;
} else
++p;
@@ -321,12 +359,30 @@ namespace GameRes.Formats.Lucifen
}
}
Key QueryEncryptionKey (string lpk_name)
public override ResourceOptions GetDefaultOptions ()
{
return new LuciOptions { Scheme = Settings.Default.LPKScheme };
}
public override object GetAccessWidget ()
{
return new GUI.WidgetLPK();
}
EncryptionScheme QueryEncryptionScheme ()
{
CurrentFileMap.Clear();
var options = Query<LuciOptions> (arcStrings.ArcEncryptedNotice);
if (null == options)
throw new UnknownEncryptionScheme();
return options.Key;
return KnownSchemes["Default"];
string title = options.Scheme;
if (null == options.Key)
{
Dictionary<string, Key> file_map = null;
if (KnownKeys.TryGetValue (title, out file_map))
CurrentFileMap = new Dictionary<string, Key> (file_map);
}
return KnownSchemes[title];
}
}