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(malie): generalized encryption handling.

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This commit is contained in:
morkt
2017-06-06 23:22:19 +04:00
parent 2d186edb39
commit da3403339e
5 changed files with 319 additions and 163 deletions
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184
ArcFormats/Malie/ArcLIB.cs
View File

@@ -27,8 +27,6 @@ using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Text;
using GameRes.Cryptography;
using GameRes.Utility;
namespace GameRes.Formats.Malie
@@ -115,46 +113,15 @@ namespace GameRes.Formats.Malie
public class MalieArchive : ArcFile
{
public readonly Camellia Encryption;
public readonly IMalieDecryptor Decryptor;
public MalieArchive (ArcView file, ArchiveFormat format, ICollection<Entry> dir, Camellia encryption)
public MalieArchive (ArcView file, ArchiveFormat format, ICollection<Entry> dir, IMalieDecryptor decr)
: base (file, format, dir)
{
Encryption = encryption;
Decryptor = decr;
}
}
[Serializable]
public class LibScheme
{
public uint DataAlign;
public uint[] Key;
public LibScheme (uint[] key) : this (0x1000, key)
{
}
public LibScheme (uint align, uint[] key)
{
DataAlign = align;
Key = key;
}
public LibScheme (string key) : this (Camellia.GenerateKey (key))
{
}
public LibScheme (uint align, string key) : this (align, Camellia.GenerateKey (key))
{
}
}
[Serializable]
public class MalieScheme : ResourceScheme
{
public Dictionary<string, LibScheme> KnownSchemes;
}
[Export(typeof(ArchiveFormat))]
public class DatOpener : ArchiveFormat
{
@@ -167,6 +134,7 @@ namespace GameRes.Formats.Malie
public DatOpener ()
{
Extensions = new string[] { "lib", "dat" };
Signatures = new uint[] { 0, 0x3F503FB1 };
}
public override ArcFile TryOpen (ArcView file)
@@ -176,19 +144,19 @@ namespace GameRes.Formats.Malie
var header = new byte[0x10];
foreach (var scheme in KnownSchemes.Values)
{
var encryption = new Camellia (scheme.Key);
ReadEncrypted (file.View, encryption, 0, header, 0, 0x10);
var decryptor = scheme.CreateDecryptor();
ReadEncrypted (file.View, decryptor, 0, header, 0, 0x10);
ILibIndexReader reader;
if (Binary.AsciiEqual (header, 0, "LIBP"))
reader = new LibPReader (file, encryption, header, scheme);
reader = new LibPReader (file, decryptor, header, scheme);
else if (Binary.AsciiEqual (header, 0, "LIBU"))
reader = LibUReader.Create (file, encryption);
reader = LibUReader.Create (file, decryptor);
else
continue;
using (reader)
{
if (reader.ReadIndex())
return new MalieArchive (file, this, reader.Dir, encryption);
return new MalieArchive (file, this, reader.Dir, decryptor);
}
}
return null;
@@ -199,25 +167,25 @@ namespace GameRes.Formats.Malie
var march = arc as MalieArchive;
if (null == march)
return arc.File.CreateStream (entry.Offset, entry.Size);
var input = new EncryptedStream (march.File, march.Encryption);
var input = new EncryptedStream (march.File, march.Decryptor);
return new StreamRegion (input, entry.Offset, entry.Size);
}
internal abstract class LibIndexReader : ILibIndexReader
{
protected ArcView.Frame m_view;
protected readonly long m_max_offset;
protected Camellia m_enc;
protected List<Entry> m_dir = new List<Entry>();
protected byte[] m_header;
protected ArcView.Frame m_view;
protected readonly long m_max_offset;
protected IMalieDecryptor m_dec;
protected List<Entry> m_dir = new List<Entry>();
protected byte[] m_header;
public List<Entry> Dir { get { return m_dir; } }
protected LibIndexReader (ArcView file, Camellia encryption, byte[] header)
protected LibIndexReader (ArcView file, IMalieDecryptor decryptor, byte[] header)
{
m_view = file.View;
m_max_offset = file.MaxOffset;
m_enc = encryption;
m_dec = decryptor;
m_header = header;
}
@@ -243,8 +211,8 @@ namespace GameRes.Formats.Malie
long m_data_align;
uint[] m_offset_table;
public LibPReader (ArcView file, Camellia encryption, byte[] header, LibScheme scheme)
: base (file, encryption, header)
public LibPReader (ArcView file, IMalieDecryptor decryptor, byte[] header, LibScheme scheme)
: base (file, decryptor, header)
{
m_base_offset = 0;
m_data_align = scheme.DataAlign - 1;
@@ -261,10 +229,10 @@ namespace GameRes.Formats.Malie
var offsets = new byte[4 * offset_count];
m_base_offset += 0x10;
if (m_index.Length != ReadEncrypted (m_view, m_enc, m_base_offset, m_index, 0, m_index.Length))
if (m_index.Length != ReadEncrypted (m_view, m_dec, m_base_offset, m_index, 0, m_index.Length))
return false;
m_base_offset += m_index.Length;
if (offsets.Length != ReadEncrypted (m_view, m_enc, m_base_offset, offsets, 0, offsets.Length))
if (offsets.Length != ReadEncrypted (m_view, m_dec, m_base_offset, offsets, 0, offsets.Length))
return false;
m_offset_table = new uint[offset_count];
Buffer.BlockCopy (offsets, 0, m_offset_table, 0, offsets.Length);
@@ -306,7 +274,7 @@ namespace GameRes.Formats.Malie
}
}
private static int ReadEncrypted (ArcView.Frame view, Camellia enc, long offset, byte[] buffer, int index, int length)
private static int ReadEncrypted (ArcView.Frame view, IMalieDecryptor dec, long offset, byte[] buffer, int index, int length)
{
int offset_pad = (int)offset & 0xF;
int aligned_len = (offset_pad + length + 0xF) & ~0xF;
@@ -328,7 +296,7 @@ namespace GameRes.Formats.Malie
for (int block_count = aligned_len / 0x10; block_count > 0; --block_count)
{
enc.DecryptBlock (offset, aligned_buf, block);
dec.DecryptBlock (offset, aligned_buf, block);
block += 0x10;
offset += 0x10;
}
@@ -345,110 +313,4 @@ namespace GameRes.Formats.Malie
set { KnownSchemes = ((MalieScheme)value).KnownSchemes; }
}
}
internal class EncryptedStream : Stream
{
ArcView.Frame m_view;
Camellia m_enc;
long m_max_offset;
long m_position = 0;
byte[] m_current_block = new byte[BlockLength];
int m_current_block_length = 0;
long m_current_block_position = 0;
public const int BlockLength = 0x1000;
public Camellia Encryption { get { return m_enc; } }
public EncryptedStream (ArcView mmap, Camellia encryption)
{
m_view = mmap.CreateFrame();
m_enc = encryption;
m_max_offset = mmap.MaxOffset;
}
public override int Read (byte[] buf, int index, int count)
{
int total_read = 0;
bool refill_buffer = !(m_position >= m_current_block_position && m_position < m_current_block_position + m_current_block_length);
while (count > 0 && m_position < m_max_offset)
{
if (refill_buffer)
{
m_current_block_position = m_position & ~((long)BlockLength-1);
FillBuffer();
}
int src_offset = (int)m_position & (BlockLength-1);
int available = Math.Min (count, m_current_block_length - src_offset);
Buffer.BlockCopy (m_current_block, src_offset, buf, index, available);
m_position += available;
total_read += available;
index += available;
count -= available;
refill_buffer = true;
}
return total_read;
}
private void FillBuffer ()
{
m_current_block_length = m_view.Read (m_current_block_position, m_current_block, 0, (uint)BlockLength);
for (int offset = 0; offset < m_current_block_length; offset += 0x10)
{
m_enc.DecryptBlock (m_current_block_position+offset, m_current_block, offset);
}
}
#region IO.Stream methods
public override bool CanRead { get { return !m_disposed; } }
public override bool CanWrite { get { return false; } }
public override bool CanSeek { get { return !m_disposed; } }
public override long Length { get { return m_max_offset; } }
public override long Position
{
get { return m_position; }
set { m_position = value; }
}
public override long Seek (long pos, SeekOrigin whence)
{
if (SeekOrigin.Current == whence)
m_position += pos;
else if (SeekOrigin.End == whence)
m_position = m_max_offset + pos;
else
m_position = pos;
return m_position;
}
public override void Write (byte[] buf, int index, int count)
{
throw new NotSupportedException();
}
public override void SetLength (long length)
{
throw new NotSupportedException();
}
public override void Flush ()
{
}
#endregion
#region IDisposable methods
bool m_disposed = false;
protected override void Dispose (bool disposing)
{
if (!m_disposed)
{
if (disposing)
m_view.Dispose();
m_disposed = true;
base.Dispose();
}
}
#endregion
}
}