mirror of
https://github.com/crskycode/GARbro.git
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348 lines
12 KiB
C#
348 lines
12 KiB
C#
//! \file Encryption.cs
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//! \date Sun Mar 12 04:51:11 2017
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//! \brief QLIE encryption-related classes.
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//
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// Copyright (C) 2017 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.Text;
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namespace GameRes.Formats.Qlie
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{
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internal interface IEncryption
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{
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bool IsUnicode { get; }
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uint CalculateHash (byte[] data, int length);
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string DecryptName (byte[] name, int name_length);
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void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry);
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}
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internal abstract class QlieEncryption : IEncryption
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{
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public virtual bool IsUnicode { get { return false; } }
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/// <summary>
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/// Hash generated from the key data contained within archive index.
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/// </summary>
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public uint ArcKey { get; protected set; }
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/// <summary>
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/// Key used to decrypt names, usually same as ArcKey.
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/// </summary>
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public int NameKey { get; protected set; }
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public static IEncryption Create (ArcView file, Version version, byte[] arc_key)
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{
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if (2 == version.Major || 1 == version.Major)
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return new EncryptionV2();
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else if (3 == version.Major && 1 == version.Minor)
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return new EncryptionV3_1 (file);
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else if (3 == version.Major && 0 == version.Minor)
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return new EncryptionV3 (file, arc_key);
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else
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throw new NotSupportedException ("Not supported QLIE archive version");
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}
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public abstract uint CalculateHash (byte[] data, int length);
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public abstract string DecryptName (byte[] name, int name_length);
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public abstract void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry);
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}
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internal class EncryptionV2 : QlieEncryption
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{
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public EncryptionV2 ()
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{
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NameKey = 0xC4;
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ArcKey = 0;
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}
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public override uint CalculateHash (byte[] data, int length)
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{
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return 0; // not implemented
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}
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public override string DecryptName (byte[] name, int name_length)
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{
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int key = name_length + (NameKey ^ 0x3E);
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for (int k = 0; k < name_length; ++k)
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name[k] ^= (byte)(((k + 1) ^ key) + k + 1);
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return Encodings.cp932.GetString (name, 0, name_length);
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}
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public override void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry)
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{
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset");
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if (length > data.Length || offset > data.Length - length)
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throw new ArgumentOutOfRangeException ("length");
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uint arc_key = ArcKey;
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ulong hash = 0xA73C5F9DA73C5F9Dul;
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ulong xor = ((uint)length + arc_key) ^ 0xFEC9753Eu;
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xor |= xor << 32;
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unsafe
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{
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fixed (byte* raw = data)
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{
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ulong* encoded = (ulong*)(raw + offset);
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for (int i = 0; i < length / 8; ++i)
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{
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hash = MMX.PAddD (hash, 0xCE24F523CE24F523ul) ^ xor;
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xor = *encoded ^ hash;
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*encoded++ = xor;
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}
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}
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}
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}
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}
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internal class EncryptionV3 : EncryptionV2
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{
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/// <summary>
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/// Internal game data used to decrypt encrypted entries.
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/// null if not used.
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/// </summary>
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public byte[] GameKeyData;
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public EncryptionV3 (ArcView file, byte[] game_key)
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{
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GameKeyData = game_key;
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var key_data = file.View.ReadBytes (file.MaxOffset-0x41C, 0x100);
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ArcKey = CalculateHash (key_data, key_data.Length) & 0x0FFFFFFFu;
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NameKey = (int)ArcKey;
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}
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public override uint CalculateHash (byte[] data, int length)
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{
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if (length > data.Length)
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throw new ArgumentOutOfRangeException ("length");
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unsafe
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{
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fixed (byte* data8 = data)
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{
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ulong hash = 0;
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ulong key = 0;
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ulong* data64 = (ulong*)data8;
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for (int i = length / 8; i > 0; --i)
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{
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hash = MMX.PAddW (hash, 0x0307030703070307);
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key = MMX.PAddW (key, *data64++ ^ hash);
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}
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return (uint)(key ^ (key >> 32));
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}
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}
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}
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public override void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry)
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{
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var key_file = entry.KeyFile;
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if (null == key_file)
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{
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base.DecryptEntry (data, offset, length, entry);
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return;
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}
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// play it safe with 'unsafe' sections
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset");
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if (length > data.Length || offset > data.Length - length)
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throw new ArgumentOutOfRangeException ("length");
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if (length < 8)
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return;
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var file_name = entry.RawName;
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uint hash = 0x85F532;
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uint seed = 0x33F641;
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for (uint i = 0; i < file_name.Length; i++)
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{
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hash += (i & 0xFF) * file_name[i];
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seed ^= hash;
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}
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seed += ArcKey ^ (7 * ((uint)length & 0xFFFFFF) + (uint)length
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+ hash + (hash ^ (uint)length ^ 0x8F32DCu));
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seed = 9 * (seed & 0xFFFFFF);
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if (GameKeyData != null)
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seed ^= 0x453A;
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var mt = new QlieMersenneTwister (seed);
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if (key_file != null)
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mt.XorState (key_file);
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if (GameKeyData != null)
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mt.XorState (GameKeyData);
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// game code fills dword[41] table, but only the first 16 qwords are used
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ulong[] table = new ulong[16];
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for (int i = 0; i < table.Length; ++i)
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table[i] = mt.Rand64();
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// compensate for 9 discarded dwords
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for (int i = 0; i < 9; ++i)
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mt.Rand();
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ulong hash64 = mt.Rand64();
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uint t = mt.Rand() & 0xF;
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unsafe
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{
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fixed (byte* raw_data = &data[offset])
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{
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ulong* data64 = (ulong*)raw_data;
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int qword_length = length / 8;
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for (int i = 0; i < qword_length; ++i)
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{
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hash64 = MMX.PAddD (hash64 ^ table[t], table[t]);
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ulong d = data64[i] ^ hash64;
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data64[i] = d;
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hash64 = MMX.PAddB (hash64, d) ^ d;
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hash64 = MMX.PAddW (MMX.PSllD (hash64, 1), d);
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t++;
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t &= 0xF;
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}
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}
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}
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}
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}
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internal class EncryptionV3_1 : QlieEncryption
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{
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public override bool IsUnicode { get { return true; } }
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public EncryptionV3_1 (ArcView file)
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{
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var key_data = file.View.ReadBytes (file.MaxOffset-0x41C, 0x100);
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ArcKey = CalculateHash (key_data, key_data.Length) & 0x0FFFFFFFu;
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NameKey = (int)ArcKey;
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}
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public override uint CalculateHash (byte[] data, int length)
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{
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if (length > data.Length)
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throw new ArgumentOutOfRangeException ("length");
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unsafe
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{
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fixed (byte* data8 = data)
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{
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ulong hash = 0;
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ulong key = 0;
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ulong* data64 = (ulong*)data8;
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for (int i = length / 8; i > 0; --i)
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{
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hash = MMX.PAddW (hash, 0xA35793A7A35793A7ul);
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key = MMX.PAddW (key, *data64++ ^ hash);
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key = MMX.PSllD (key, 3) | MMX.PSrlD (key, 29);
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}
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// MMX.PMAddWD (key, key >> 32);
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return (uint)((short)key * (short)(key >> 32) + (short)(key >> 16) * (short)(key >> 48));
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}
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}
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}
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public override string DecryptName (byte[] name, int name_length)
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{
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int char_count = name_length / 2;
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int hash = (char_count * char_count) ^ char_count;
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hash ^= 0x3E13 ^ (NameKey >> 16) ^ NameKey;
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hash &= 0xFFFF;
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int key = hash;
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for (int i = 0; i < char_count; ++i)
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{
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key = hash + i + 8 * key;
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name[i*2 ] ^= (byte)key;
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name[i*2+1] ^= (byte)(key >> 8);
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}
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return Encoding.Unicode.GetString (name, 0, name_length);
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}
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public override void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry)
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{
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset");
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if (length > data.Length || offset > data.Length - length)
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throw new ArgumentOutOfRangeException ("length");
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if (length < 8)
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return;
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var file_name = entry.Name;
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uint hash = 0x85F532;
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uint seed = 0x33F641;
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for (int i = 0; i < file_name.Length; i++)
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{
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hash += (uint)(file_name[i] << (i & 7));
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seed ^= hash;
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}
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seed += ArcKey ^ (7 * ((uint)length & 0xFFFFFF) + (uint)length
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+ hash + (hash ^ (uint)length ^ 0x8F32DCu));
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seed = 9 * (seed & 0xFFFFFF);
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var table = GenerateTable (0x20, seed); // originally 0x2C, 12 dwords not used
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unsafe
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{
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fixed (byte* raw_data = &data[offset])
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{
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ulong* data64 = (ulong*)raw_data;
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int qword_length = length / 8;
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uint k = 2 * (table[0xD] & 0xF);
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ulong hash64 = table[6] | (ulong)table[7] << 32;
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for (int i = 0; i < qword_length; ++i)
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{
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ulong t = table[k] | (ulong)table[k+1] << 32;
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hash64 = MMX.PAddD (hash64 ^ t, t);
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ulong d = data64[i] ^ hash64;
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data64[i] = d;
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hash64 = MMX.PAddB (hash64, d) ^ d;
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hash64 = MMX.PAddW (MMX.PSllD (hash64, 1), d);
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k = (k + 2) & 0x1F;
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}
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}
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}
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}
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static uint[] GenerateTable (int length, uint seed)
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{
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const uint key = 0x8DF21431u;
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var table = new uint[length];
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for (int i = 0; i < length; ++i)
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{
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ulong x = key * (ulong)(seed ^ key);
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seed = (uint)((x >> 32) + x);
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table[i] = seed;
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}
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return table;
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}
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}
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}
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