mirror of
https://github.com/crskycode/GARbro.git
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570 lines
21 KiB
C#
570 lines
21 KiB
C#
//! \file ArcEncrypted.cs
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//! \date Thu Jan 14 03:27:52 2016
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//! \brief Encrypted AZ system resource archives.
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//
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// Copyright (C) 2016 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 GameRes.Compression;
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using GameRes.Utility;
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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.IO;
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using System.Linq;
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using System.Security.Cryptography;
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namespace GameRes.Formats.AZSys
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{
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[Serializable]
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public class EncryptionScheme
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{
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public readonly uint IndexKey;
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public readonly uint? ContentKey;
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public static readonly uint[] DefaultSeed = { 0x2F4D7DFE, 0x47345292, 0x1BA5FE82, 0x7BC04525 };
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public EncryptionScheme (uint ikey, uint ckey)
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{
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IndexKey = ikey;
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ContentKey = ckey;
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}
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public EncryptionScheme (uint[] iseed)
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{
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IndexKey = GenerateKey (iseed);
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ContentKey = null;
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}
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public EncryptionScheme (uint[] iseed, byte[] cseed)
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{
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IndexKey = GenerateKey (iseed);
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ContentKey = GenerateContentKey (cseed);
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}
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public static uint GenerateKey (uint[] seed)
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{
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if (null == seed)
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throw new ArgumentNullException ("seed");
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if (seed.Length < 4)
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throw new ArgumentException();
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byte[] seed_bytes = new byte[0x10];
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Buffer.BlockCopy (seed, 0, seed_bytes, 0, 0x10);
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uint key = Crc32.UpdateCrc (~seed[0], seed_bytes, 0, seed_bytes.Length)
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^ Crc32.UpdateCrc (~(seed[1] & 0xFFFF), seed_bytes, 0, seed_bytes.Length)
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^ Crc32.UpdateCrc (~(seed[1] >> 16), seed_bytes, 0, seed_bytes.Length)
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^ Crc32.UpdateCrc (~seed[2], seed_bytes, 0, seed_bytes.Length)
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^ Crc32.UpdateCrc (~seed[3], seed_bytes, 0, seed_bytes.Length);
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return seed[0] ^ ~key;
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}
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public static uint GenerateContentKey (byte[] env_bytes)
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{
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if (null == env_bytes)
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throw new ArgumentNullException ("env_bytes");
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if (env_bytes.Length < 0x10)
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throw new ArgumentException();
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uint crc = Crc32.Compute (env_bytes, 0, 0x10);
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var sfmt = new FastMersenneTwister (crc);
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var seed = new uint[4];
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seed[0] = sfmt.GetRand32();
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seed[1] = sfmt.GetRand32() & 0xFFFF;
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seed[1] |= sfmt.GetRand32() << 16;
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seed[2] = sfmt.GetRand32();
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seed[3] = sfmt.GetRand32();
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return GenerateKey (seed);
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}
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}
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[Serializable]
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public class AzScheme : ResourceScheme
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{
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public Dictionary<string, EncryptionScheme> KnownSchemes;
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}
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internal class AzArchive : ArcFile
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{
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public readonly uint SysenvKey;
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public readonly uint RegularKey;
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public AzArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, uint syskey, uint regkey)
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: base (arc, impl, dir)
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{
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SysenvKey = syskey;
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RegularKey = regkey;
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}
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}
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public abstract class ArcEncryptedBase : ArchiveFormat
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{
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internal List<Entry> ParseIndex (Stream input, int count, long base_offset, long max_offset)
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{
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using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
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using (var index = new BinaryReader (zstream))
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{
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var dir = new List<Entry> (count);
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var name_buffer = new byte[0x20];
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for (int i = 0; i < count; ++i)
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{
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uint offset = index.ReadUInt32();
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uint size = index.ReadUInt32();
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uint crc = index.ReadUInt32();
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index.ReadInt32();
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if (name_buffer.Length != index.Read (name_buffer, 0, name_buffer.Length))
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return null;
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var name = Binary.GetCString (name_buffer, 0, 0x20);
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if (0 == name.Length)
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return null;
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = base_offset + offset;
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entry.Size = size;
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if (!entry.CheckPlacement (max_offset))
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return null;
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dir.Add (entry);
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}
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return dir;
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}
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}
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internal bool DecryptAsb (byte[] data)
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{
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int packed_size = LittleEndian.ToInt32 (data, 4);
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if (packed_size <= 4 || packed_size > data.Length-0x10)
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return false;
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uint unpacked_size = LittleEndian.ToUInt32 (data, 8);
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uint key = unpacked_size ^ 0x9E370001;
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unsafe
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{
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fixed (byte* raw = &data[0x10])
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{
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uint* data32 = (uint*)raw;
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for (int i = packed_size/4; i > 0; --i)
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*data32++ -= key;
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}
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}
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return true;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class ArcEncryptedOpener : ArcEncryptedBase
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{
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public override string Tag { get { return "ARC/AZ/encrypted"; } }
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public override string Description { get { return "AZ system encrypted resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public static Dictionary<string, EncryptionScheme> KnownSchemes = new Dictionary<string, EncryptionScheme>
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{
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{ "Default", new EncryptionScheme (EncryptionScheme.DefaultSeed) },
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};
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public override ResourceScheme Scheme
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{
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get { return new AzScheme { KnownSchemes = KnownSchemes }; }
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set { KnownSchemes = ((AzScheme)value).KnownSchemes; }
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}
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public ArcEncryptedOpener ()
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{
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Extensions = new string[] { "arc" };
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Signatures = new uint[] { 0x53EA06EB, 0x74F98F2F };
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}
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EncryptionScheme CurrentScheme;
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public override ArcFile TryOpen (ArcView file)
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{
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byte[] header_encrypted = file.View.ReadBytes (0, 0x30);
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if (header_encrypted.Length < 0x30)
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return null;
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byte[] header = new byte[header_encrypted.Length];
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if (CurrentScheme != null)
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{
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try
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{
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Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
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Decrypt (header, 0, CurrentScheme.IndexKey);
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if (Binary.AsciiEqual (header, 0, "ARC\0"))
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{
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var arc = ReadIndex (file, header, CurrentScheme);
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if (null != arc)
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return arc;
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}
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}
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catch { /* ignore parse errors */ }
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}
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foreach (var scheme in KnownSchemes.Values)
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{
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Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
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Decrypt (header, 0, scheme.IndexKey);
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if (Binary.AsciiEqual (header, 0, "ARC\0"))
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{
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var arc = ReadIndex (file, header, scheme);
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if (null != arc)
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CurrentScheme = new EncryptionScheme (arc.SysenvKey, arc.RegularKey);
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return arc;
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}
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}
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return null;
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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 azarc = arc as AzArchive;
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if (null == azarc)
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return base.OpenEntry (arc, entry);
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var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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if (entry.Name.Equals ("sysenv.tbl", StringComparison.InvariantCultureIgnoreCase))
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{
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Decrypt (data, entry.Offset, azarc.SysenvKey);
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return UnpackData (data);
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}
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Decrypt (data, entry.Offset, azarc.RegularKey);
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if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0") && DecryptAsb (data))
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{
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var asb = UnpackData (data, 0x10);
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var header = new byte[0x10];
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Buffer.BlockCopy (data, 0, header, 0, 0x10);
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return new PrefixStream (header, asb);
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}
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return new BinMemoryStream (data, entry.Name);
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}
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uint ReadSysenvSeed (ArcView file, IEnumerable<Entry> dir, uint key)
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{
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var entry = dir.FirstOrDefault (e => e.Name.Equals ("sysenv.tbl", StringComparison.InvariantCultureIgnoreCase));
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if (null == entry)
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return key;
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var data = file.View.ReadBytes (entry.Offset, entry.Size);
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if (data.Length <= 4)
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throw new InvalidFormatException ("Invalid sysenv.tbl size");
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Decrypt (data, entry.Offset, key);
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uint adler32 = LittleEndian.ToUInt32 (data, 0);
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if (adler32 != Adler32.Compute (data, 4, data.Length-4))
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throw new InvalidEncryptionScheme();
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using (var input = new MemoryStream (data, 4, data.Length-4))
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using (var sysenv_stream = new ZLibStream (input, CompressionMode.Decompress))
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{
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var seed = new byte[0x10];
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if (0x10 != sysenv_stream.Read (seed, 0, 0x10))
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throw new InvalidFormatException ("Invalid sysenv.tbl size");
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return EncryptionScheme.GenerateContentKey (seed);
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}
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}
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Stream UnpackData (byte[] data, int index = 0)
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{
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int length = data.Length - index;
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if (length <= 4)
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return new MemoryStream (data, index, length);
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uint adler32 = LittleEndian.ToUInt32 (data, index);
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if (adler32 != Adler32.Compute (data, index+4, length-4))
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return new MemoryStream (data, index, length);
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var input = new MemoryStream (data, index+4, length-4);
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return new ZLibStream (input, CompressionMode.Decompress);
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}
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AzArchive ReadIndex (ArcView file, byte[] header, EncryptionScheme scheme)
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{
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int ext_count = LittleEndian.ToInt32 (header, 4);
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int count = LittleEndian.ToInt32 (header, 8);
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uint index_length = LittleEndian.ToUInt32 (header, 12);
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if (ext_count < 1 || ext_count > 8 || !IsSaneCount (count) || index_length >= file.MaxOffset)
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return null;
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var packed_index = file.View.ReadBytes (header.Length, index_length);
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if (packed_index.Length != index_length)
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return null;
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Decrypt (packed_index, header.Length, scheme.IndexKey);
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uint checksum = LittleEndian.ToUInt32 (packed_index, 0);
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if (checksum != Adler32.Compute (packed_index, 4, packed_index.Length-4))
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{
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if (checksum != Crc32.Compute (packed_index, 4, packed_index.Length-4))
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throw new InvalidFormatException ("Index checksum mismatch");
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}
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using (var input = new MemoryStream (packed_index, 4, packed_index.Length-4))
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{
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var dir = ParseIndex (input, count, header.Length + index_length, file.MaxOffset);
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if (null == dir)
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return null;
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uint content_key = GetContentKey (file, dir, scheme);
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return new AzArchive (file, this, dir, scheme.IndexKey, content_key);
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}
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}
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static void Decrypt (byte[] data, long offset, uint key)
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{
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ulong hash = key * 0x9E370001ul;
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if (0 != (offset & 0x3F))
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{
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hash = Binary.RotL (hash, (int)offset);
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}
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for (uint i = 0; i < data.Length; ++i)
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{
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data[i] ^= (byte)hash;
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hash = Binary.RotL (hash, 1);
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}
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}
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uint GetContentKey (ArcView file, List<Entry> dir, EncryptionScheme scheme)
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{
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if (null != scheme.ContentKey)
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return scheme.ContentKey.Value;
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if ("system.arc".Equals (Path.GetFileName (file.Name), StringComparison.InvariantCultureIgnoreCase))
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{
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return ReadSysenvSeed (file, dir, scheme.IndexKey);
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}
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else
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{
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var system_arc = VFS.CombinePath (VFS.GetDirectoryName (file.Name), "system.arc");
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using (var arc = VFS.OpenView (system_arc))
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{
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var header = arc.View.ReadBytes (0, 0x30);
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Decrypt (header, 0, scheme.IndexKey);
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using (var arc_file = ReadIndex (arc, header, scheme))
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{
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return ReadSysenvSeed (arc, arc_file.Dir, scheme.IndexKey);
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}
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}
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}
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class ArcIsaacEncryptedOpener : ArcEncryptedBase
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{
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public override string Tag { get { return "ARC/AZ/ISAAC"; } }
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public override string Description { get { return "AZ system encrypted resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public ArcIsaacEncryptedOpener ()
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{
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Extensions = new string[] { "arc" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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byte[] header_encrypted = file.View.ReadBytes (0, 0x30);
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if (header_encrypted.Length < 0x30)
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return null;
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byte[] header = new byte[header_encrypted.Length];
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Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
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var cipher = new AzIsaacEncryption ((uint)file.MaxOffset);
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cipher.Decrypt (header, 0, header.Length, 0);
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if (!Binary.AsciiEqual (header, 0, "ARC\0"))
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return null;
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int ext_count = LittleEndian.ToInt32 (header, 4);
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int count = LittleEndian.ToInt32 (header, 8);
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uint index_length = LittleEndian.ToUInt32 (header, 12);
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if (ext_count < 1 || ext_count > 8 || !IsSaneCount (count) || index_length >= file.MaxOffset)
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return null;
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var packed_index = file.View.ReadBytes (0x30, index_length);
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if (packed_index.Length != index_length)
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return null;
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cipher.Decrypt (packed_index, 0, packed_index.Length, 0x30);
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using (var input = new MemoryStream (packed_index))
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{
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var dir = ParseIndex (input, count, header.Length + index_length, file.MaxOffset);
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if (null == dir)
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return null;
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return new ArcFile (file, this, dir);
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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 data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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var cipher = new AzIsaacEncryption (entry.Size);
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cipher.Decrypt (data, 0, data.Length, 0);
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if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0") && DecryptAsb (data))
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{
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var header = new byte[0x10];
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Buffer.BlockCopy (data, 0, header, 0, 0x10);
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Stream input = new MemoryStream (data, 0x10, data.Length-0x10);
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input = new ZLibStream (input, CompressionMode.Decompress);
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return new PrefixStream (header, input);
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}
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return new MemoryStream (data);
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}
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/// <summary>
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/// Calculate SHA1 sum of archive file.
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/// </summary>
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public byte[] CalculateSum (Stream arc)
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{
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using (var sha1 = SHA1.Create())
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return sha1.ComputeHash (arc);
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}
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}
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internal class AzIsaacEncryption
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{
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uint[] m_key = new uint[0x100];
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public AzIsaacEncryption (uint seed)
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{
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var isaac = new Isaac64Cipher (seed);
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for (int i = 0; i < m_key.Length; ++i)
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{
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m_key[i] = isaac.GetRand32();
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}
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}
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public void Decrypt (byte[] data, int index, int length, ushort offset)
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{
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for (int i = 0; i < length; ++i)
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{
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data[index + i] ^= (byte)Binary.RotL (m_key[offset & 0xFF] ^ 0x1000193, offset >> 8);
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++offset;
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}
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}
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}
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/// <summary>
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/// ISAAC 64-bit pseudorandom number generator.
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/// </summary>
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internal class Isaac64Cipher
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{
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int m_count;
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ulong[] m_entropy = new ulong[0x100];
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ulong[] m_state = new ulong[0x100];
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public Isaac64Cipher (uint seed)
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{
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unsafe
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{
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fixed (ulong* e = m_entropy)
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{
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uint* e32 = (uint*)e;
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*e32 = seed ^ 0x9E370001u;
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for (uint i = 1; i < 0x200u; ++i)
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{
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e32[i] = i - 0x61C88647u * (e32[i-1] ^ (e32[i-1] >> 30));
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}
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}
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}
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Init();
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}
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ulong aa, bb, cc;
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ulong a, b, c, d, e, f, g, h;
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void Mix ()
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{
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a -= e; f ^= h >> 9; h += a;
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b -= f; g ^= a << 9; a += b;
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c -= g; h ^= b >> 23; b += c;
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d -= h; a ^= c << 15; c += d;
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e -= a; b ^= d >> 14; d += e;
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f -= b; c ^= e << 20; e += f;
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g -= c; d ^= f >> 17; f += g;
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h -= d; e ^= g << 14; g += h;
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}
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void Init ()
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{
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aa = bb = cc = 0;
|
|
a = b = c = d = e = f = g = h = 0x9E3779B97F4A7C13ul;
|
|
|
|
int i;
|
|
for (i = 0; i < 4; ++i)
|
|
{
|
|
Mix();
|
|
}
|
|
|
|
for (i = 0; i < 0x100; i += 8)
|
|
{
|
|
a += m_entropy[i ]; b += m_entropy[i+1]; c += m_entropy[i+2]; d += m_entropy[i+3];
|
|
e += m_entropy[i+4]; f += m_entropy[i+5]; g += m_entropy[i+6]; h += m_entropy[i+7];
|
|
|
|
Mix();
|
|
m_state[i ] = a; m_state[i+1] = b; m_state[i+2] = c; m_state[i+3] = d;
|
|
m_state[i+4] = e; m_state[i+5] = f; m_state[i+6] = g; m_state[i+7] = h;
|
|
}
|
|
|
|
for (i = 0; i < 0x100; i += 8)
|
|
{
|
|
a += m_state[i ]; b += m_state[i+1]; c += m_state[i+2]; d += m_state[i+3];
|
|
e += m_state[i+4]; f += m_state[i+5]; g += m_state[i+6]; h += m_state[i+7];
|
|
|
|
Mix();
|
|
m_state[i ] = a; m_state[i+1] = b; m_state[i+2] = c; m_state[i+3] = d;
|
|
m_state[i+4] = e; m_state[i+5] = f; m_state[i+6] = g; m_state[i+7] = h;
|
|
}
|
|
Shuffle();
|
|
m_count = 0x100;
|
|
}
|
|
|
|
void RngStep (ulong mix, ref int m, ref int m2, ref int r)
|
|
{
|
|
ulong x = m_state[m];
|
|
aa = mix + m_state[m2++];
|
|
ulong y = m_state[(x >> 3) & 0xFF] + aa + bb;
|
|
m_state[m++] = y;
|
|
m_entropy[r++] = bb = m_state[(y >> 11) & 0xFF] + x;
|
|
}
|
|
|
|
void Shuffle ()
|
|
{
|
|
int m1 = 0;
|
|
int r = 0;
|
|
bb += ++cc;
|
|
int mend, m2;
|
|
mend = m2 = 0x80;
|
|
while (m1 < mend)
|
|
{
|
|
RngStep(~(aa ^ (aa << 21)), ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 5) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa << 12) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 33) , ref m1, ref m2, ref r);
|
|
}
|
|
m2 = 0;
|
|
while (m2 < mend)
|
|
{
|
|
RngStep(~(aa ^ (aa << 21)), ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 5) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa << 12) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 33) , ref m1, ref m2, ref r);
|
|
}
|
|
}
|
|
|
|
public uint GetRand32 ()
|
|
{
|
|
if (0 == m_count--)
|
|
{
|
|
Shuffle();
|
|
m_count = 0xFF;
|
|
}
|
|
ulong num = m_entropy[m_count];
|
|
return (uint)num ^ (uint)(num >> 32);
|
|
}
|
|
}
|
|
}
|