mirror of
https://github.com/crskycode/GARbro.git
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256 lines
8.9 KiB
C#
256 lines
8.9 KiB
C#
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//! \file ArcAIR.cs
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//! \date 2022 Jun 10
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//! \brief AIRNovel engine encrypted resources.
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//
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// Copyright (C) 2022 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.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Xml;
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using GameRes.Cryptography;
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using GameRes.Formats.PkWare;
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using SharpZip = ICSharpCode.SharpZipLib.Zip;
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namespace GameRes.Formats.AirNovel
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{
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internal class AirEntry : ZipEntry
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{
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public bool IsEncrypted { get; set; }
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public AirEntry (SharpZip.ZipEntry zip_entry) : base (zip_entry)
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{
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IsEncrypted = Name.EndsWith ("_");
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if (IsEncrypted)
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{
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Name = Name.Substring (0, Name.Length-1);
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Type = FormatCatalog.Instance.GetTypeFromName (Name);
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}
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}
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}
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internal class AirArchive : PkZipArchive
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{
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public byte[] Key;
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public uint CoderLength;
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public AirArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, SharpZip.ZipFile native, byte[] key) : base (arc, impl, dir, native)
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{
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Key = key;
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}
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}
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[Serializable]
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public class AirNovelScheme : ResourceScheme
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{
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public IDictionary<string, string> KnownKeys;
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}
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[Export(typeof(ArchiveFormat))]
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public class AirOpener : ArchiveFormat
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{
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public override string Tag { get { return "AIR"; } }
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public override string Description { get { return "Adobe AIR resource archive"; } }
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public override uint Signature { get { return 0; } }
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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 readonly ResourceInstance<ArchiveFormat> Zip = new ResourceInstance<ArchiveFormat> ("ZIP");
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.Name.HasExtension (".air"))
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return null;
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var input = file.CreateStream();
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SharpZip.ZipFile zip = null;
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try
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{
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SharpZip.ZipStrings.CodePage = Encoding.UTF8.CodePage;
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zip = new SharpZip.ZipFile (input);
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var files = zip.Cast<SharpZip.ZipEntry>().Where (z => !z.IsDirectory);
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bool has_encrypted = false;
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var dir = new List<Entry>();
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foreach (var f in files)
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{
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var entry = new AirEntry (f);
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has_encrypted |= entry.IsEncrypted;
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dir.Add (entry);
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}
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if (has_encrypted)
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{
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uint coder_length;
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if (FindAirNovelCoderLength (zip, out coder_length))
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{
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var key = QueryEncryptionKey (file);
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if (!string.IsNullOrEmpty (key))
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{
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var rc4_key = AirRc4Crypt.GenerateKey (key);
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return new AirArchive (file, this, dir, zip, rc4_key) { CoderLength = coder_length };
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}
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}
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}
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return new PkZipArchive (file, Zip.Value, dir, zip);
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}
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catch
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{
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if (zip != null)
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zip.Close();
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input.Dispose();
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throw;
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}
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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 zarc = (AirArchive)arc;
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var zent = (AirEntry)entry;
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var input = zarc.Native.GetInputStream (zent.NativeEntry);
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if (!zent.IsEncrypted)
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return input;
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var data = new byte[zent.UnpackedSize];
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using (input)
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input.Read (data, 0, data.Length);
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int enc_len;
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if (zent.Name.HasExtension (".an"))
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enc_len = data.Length;
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else
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enc_len = Math.Min (data.Length, (int)zarc.CoderLength);
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var rc4 = new AirRc4Crypt (zarc.Key);
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rc4.Decrypt (data, 0, enc_len);
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return new BinMemoryStream (data, entry.Name);
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}
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bool FindAirNovelCoderLength (SharpZip.ZipFile zip, out uint coder_length)
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{
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coder_length = 0;
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var config = zip.GetEntry ("config.anprj");
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if (null == config)
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return false;
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using (var input = zip.GetInputStream (config))
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{
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var coder = FindConfigNode (input, "/config/coder[@len]");
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if (null == coder)
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return false;
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var lenAttr = coder.Attributes["len"].Value;
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var styles = NumberStyles.Integer;
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if (lenAttr.StartsWith ("0x"))
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{
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lenAttr = lenAttr.Substring (2, lenAttr.Length-2);
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styles = NumberStyles.HexNumber;
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}
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return UInt32.TryParse (lenAttr, styles, CultureInfo.InvariantCulture, out coder_length);
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}
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}
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XmlNode FindConfigNode (Stream input, string xpath)
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{
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using (var reader = new StreamReader (input))
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{
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var xml = new XmlDocument();
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xml.Load (reader);
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return xml.DocumentElement.SelectSingleNode (xpath);
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}
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}
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AirNovelScheme DefaultScheme = new AirNovelScheme { KnownKeys = new Dictionary<string, string>() };
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internal IDictionary<string, string> KnownKeys { get { return DefaultScheme.KnownKeys; } }
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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 = (AirNovelScheme)value; }
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}
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string QueryEncryptionKey (ArcView file)
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{
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var title = FormatCatalog.Instance.LookupGame (file.Name);
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if (string.IsNullOrEmpty (title))
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return null;
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string key;
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if (!KnownKeys.TryGetValue (title, out key))
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return null;
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return key;
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}
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}
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internal class AirRc4Crypt
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{
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const int KeyLength = 0xFF;
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byte[] KeyState = new byte[KeyLength+1];
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public AirRc4Crypt (byte[] key)
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{
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for (int i = 0; i <= KeyLength; ++i)
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{
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KeyState[i] = (byte)i;
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}
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int j = 0;
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for (int i = 0; i <= KeyLength; ++i)
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{
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j = (j + KeyState[i] + key[i]) & KeyLength;
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KeyState[i] ^= KeyState[j];
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KeyState[j] ^= KeyState[i];
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KeyState[i] ^= KeyState[j];
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}
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}
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public static byte[] GenerateKey (string passPhrase)
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{
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if (string.IsNullOrEmpty (passPhrase))
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throw new ArgumentException ("passPhrase");
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var key = new byte[KeyLength+1];
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for (int i = 0; i < key.Length; ++i)
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{
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key[i] = (byte)passPhrase[i % passPhrase.Length];
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}
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return key;
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}
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public void Decrypt (byte[] data, int pos, int length)
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{
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int i = 0;
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int j = 0;
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var keyCopy = KeyState.Clone() as byte[];
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int last = Math.Min (pos + length, data.Length);
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while (pos < last)
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{
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i = (i + 1) & KeyLength;
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j = (j + keyCopy[i]) & KeyLength;
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// i was wondering why standard RC4 encryption class doesn't work here
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// well, this swap fails when i == j lol
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keyCopy[i] ^= keyCopy[j];
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keyCopy[j] ^= keyCopy[i];
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keyCopy[i] ^= keyCopy[j];
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int k = (keyCopy[i] + keyCopy[j]) & KeyLength;
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data[pos++] ^= keyCopy[k];
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}
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}
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}
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}
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