mirror of
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269 lines
9.7 KiB
C#
269 lines
9.7 KiB
C#
//! \file ArcKCAP.cs
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//! \date Tue Mar 10 04:47:25 2015
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//! \brief Selene resource archive implementation.
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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.Security.Cryptography;
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using System.IO;
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using GameRes.Formats.Strings;
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using GameRes.Utility;
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namespace GameRes.Formats.Selene
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{
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public class SeleneArchive : ArcFile
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{
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public readonly byte[] KeyTable;
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public SeleneArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
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: base (arc, impl, dir)
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{
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KeyTable = key;
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}
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}
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internal class KcapEntry : Entry
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{
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public bool Encrypted;
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}
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public class KcapOptions : ResourceOptions
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{
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public string PassPhrase { get; set; }
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}
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[Serializable]
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public class KcapScheme : ResourceScheme
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{
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public Dictionary<string,string> KnownSchemes;
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}
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[Export(typeof(ArchiveFormat))]
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public class PackOpener : ArchiveFormat
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{
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public override string Tag { get { return "KCAP"; } }
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public override string Description { get { return "Selene engine resource archive"; } }
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public override uint Signature { get { return 0x5041434b; } } // 'KCAP'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return false; } }
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static private string DefaultPassPhrase = "Selene.Default.Password";
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public PackOpener ()
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{
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Extensions = new string[] { "pack" };
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}
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static KcapScheme DefaultScheme = new KcapScheme { KnownSchemes = new Dictionary<string,string>() };
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public static Dictionary<string,string> KnownSchemes { get { return DefaultScheme.KnownSchemes; } }
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public override ResourceScheme Scheme
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{
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get { return DefaultScheme; }
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set { DefaultScheme = (KcapScheme)value; }
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (4);
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if (!IsSaneCount (count))
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return null;
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uint index_size = (uint)count * 0x54u;
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if (index_size > file.View.Reserve (8, index_size))
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return null;
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long index_offset = 8;
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var dir = new List<Entry> (count);
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bool encrypted = false;
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for (int i = 0; i < count; ++i)
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{
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string name = file.View.ReadString (index_offset, 0x40);
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var entry = Create<KcapEntry> (name);
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entry.Offset = file.View.ReadUInt32 (index_offset+0x48);
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entry.Size = file.View.ReadUInt32 (index_offset+0x4C);
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entry.Encrypted = 0 != file.View.ReadUInt32 (index_offset+0x50);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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encrypted = encrypted || entry.Encrypted;
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dir.Add (entry);
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index_offset += 0x54;
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}
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if (!encrypted)
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return new ArcFile (file, this, dir);
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var options = Query<KcapOptions> (arcStrings.ArcEncryptedNotice);
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var key = CreateKeyTable (options.PassPhrase);
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return new SeleneArchive (file, this, dir, key);
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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 input = arc.File.CreateStream (entry.Offset, entry.Size);
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var kpa = arc as SeleneArchive;
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var kpe = entry as KcapEntry;
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if (null == kpa || null == kpe || !kpe.Encrypted)
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return input;
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return new InputCryptoStream (input, new KcapTransform(kpa.KeyTable));
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}
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public static string GetPassPhrase (string title)
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{
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string pass;
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if (string.IsNullOrEmpty (title) || !KnownSchemes.TryGetValue (title, out pass))
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return "";
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return pass;
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetKCAP();
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new KcapOptions {
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PassPhrase = Properties.Settings.Default.KCAPPassPhrase,
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};
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}
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static private byte[] CreateKeyTable (string pass)
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{
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if (pass.Length < 8)
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pass = DefaultPassPhrase;
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int pass_len = pass.Length;
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uint seed = PasskeyHash (pass);
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var rng = new KeyTableGenerator ((int)seed);
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byte[] table = new byte[0x10000];
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for (int i = 0; i < table.Length; ++i)
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{
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int key = rng.Rand();
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table[i] = (byte)(pass[i % pass_len] ^ (key >> 16));
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}
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return table;
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}
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static uint PasskeyHash (string pass)
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{
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var bytes = Encodings.cp932.GetBytes (pass);
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return Crc32.Compute (bytes, 0, bytes.Length);
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}
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/// <summary>
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/// Mersenne Twister with signed integer arithmetics, resulting in a different sequence.
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/// </summary>
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internal class KeyTableGenerator
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{
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const int StateLength = 624;
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const int StateM = 397;
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const int MatrixA = -1727483681;
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const int TemperingMaskB = -1658038656;
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const int TemperingMaskC = -272236544;
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private int[] m_table = new int[StateLength];
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private int m_pos;
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public KeyTableGenerator (int seed = 0)
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{
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SRand (seed);
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}
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public void SRand (int seed)
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{
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m_table[0] = seed;
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for (int i = 1; i < StateLength; ++i)
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m_table[i] = i + 0x6C078965 * (m_table[i-1] ^ (m_table[i-1] >> 30));
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m_pos = StateLength;
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}
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private static int[] mag01 = new int[2] { 0, MatrixA };
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public int Rand ()
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{
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if (m_pos >= StateLength)
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{
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int i;
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for (i = 0; i < StateLength - StateM; ++i)
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{
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int x = m_table[i] ^ m_table[i+1];
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m_table[i] = m_table[i + StateM] ^ mag01[(m_table[i] ^ x) & 1]
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^ ((m_table[i] ^ x & 0x7FFFFFFF) >> 1);
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}
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for (; i < StateLength - 1; ++i)
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{
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int x = m_table[i] ^ m_table[i + 1];
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m_table[i] = m_table[i + StateM - StateLength] ^ mag01[(m_table[i] ^ x) & 1]
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^ ((m_table[i] ^ x & 0x7FFFFFFF) >> 1);
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}
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int z = m_table[StateLength - 1] ^ (m_table[0] ^ m_table[StateLength-1]) & 0x7FFFFFFF;
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m_table[StateLength - 1] = m_table[StateM-1] ^ (z >> 1) ^ mag01[z & 1];
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m_pos = 0;
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}
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int y = m_table[m_pos++];
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y ^= y >> 11;
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y ^= (y << 7) & TemperingMaskB;
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y ^= (y << 15) & TemperingMaskC;
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y ^= y >> 18;
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return y;
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}
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}
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internal class KcapTransform : ICryptoTransform
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{
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private readonly byte[] KeyTable;
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public bool CanReuseTransform { get { return true; } }
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public bool CanTransformMultipleBlocks { get { return false; } }
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public int InputBlockSize { get { return KeyTable.Length; } }
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public int OutputBlockSize { get { return KeyTable.Length; } }
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public KcapTransform (byte[] key_table)
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{
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KeyTable = key_table;
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}
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public int TransformBlock (byte[] inputBuffer, int inputOffset, int inputCount,
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byte[] outputBuffer, int outputOffset)
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{
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for (int i = 0; i < inputCount; ++i)
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{
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outputBuffer[outputOffset++] = (byte)(inputBuffer[inputOffset+i]^KeyTable[i]);
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}
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return inputCount;
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}
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public byte[] TransformFinalBlock (byte[] inputBuffer, int inputOffset, int inputCount)
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{
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byte[] outputBuffer = new byte[inputCount];
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TransformBlock (inputBuffer, inputOffset, inputCount, outputBuffer, 0);
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return outputBuffer;
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}
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public void Dispose ()
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{
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System.GC.SuppressFinalize (this);
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}
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}
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}
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}
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