mirror of
https://github.com/crskycode/GARbro.git
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826 lines
27 KiB
C#
826 lines
27 KiB
C#
//! \file CryptAlgorithms.cs
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//! \date Thu Feb 04 12:08:40 2016
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//! \brief KiriKiri engine encryption algorithms.
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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 System;
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using System.Collections.Generic;
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using System.Linq;
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using GameRes.Utility;
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namespace GameRes.Formats.KiriKiri
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{
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[Serializable]
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public abstract class ICrypt
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{
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/// <summary>
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/// whether Adler32 checksum should be calculated after contents have been encrypted.
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/// </summary>
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public virtual bool HashAfterCrypt { get { return false; } }
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/// <summary>
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/// sometimes startup.tjs file is not encrypted.
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/// </summary>
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public bool StartupTjsNotEncrypted { get; set; }
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/// <summary>
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/// whether XP3 index is obfuscated:
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/// - duplicate entries
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/// - entries have additional dummy segments
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/// </summary>
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public bool ObfuscatedIndex { get; set; }
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public virtual byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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byte[] buffer = new byte[1] { value };
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Decrypt (entry, offset, buffer, 0, 1);
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return buffer[0];
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}
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public abstract void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count);
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public virtual void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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throw new NotImplementedException (Strings.arcStrings.MsgEncNotImplemented);
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}
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/// <summary>
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/// Perform necessary initialization specific to an archive being opened.
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/// </summary>
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public virtual void Init (ArcFile arc)
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{
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}
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}
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[Serializable]
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public class NoCrypt : ICrypt
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{
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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return value;
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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return;
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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return;
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}
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}
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[Serializable]
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public class FateCrypt : ICrypt
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{
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public override bool HashAfterCrypt { get { return true; } }
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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byte result = (byte)(value ^ 0x36);
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if (0x13 == offset)
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result ^= 1;
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else if (0x2ea29 == offset)
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result ^= 3;
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return result;
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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for (int i = 0; i < count; ++i)
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{
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values[pos+i] ^= 0x36;
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}
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if (offset > 0x2ea29)
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return;
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if (offset + count > 0x2ea29)
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values[pos+0x2ea29-offset] ^= 3;
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if (offset > 0x13)
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return;
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if (offset + count > 0x13)
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values[pos+0x13-offset] ^= 1;
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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Decrypt (entry, offset, values, pos, count);
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}
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}
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[Serializable]
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public class MizukakeCrypt : ICrypt
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{
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public override bool HashAfterCrypt { get { return true; } }
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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if (offset <= 0x103 && offset + count > 0x103)
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values[pos+0x103-offset]--;
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for (int i = 0; i < count; ++i)
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{
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values[pos+i] ^= 0xB6;
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}
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if (offset > 0x3F82)
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return;
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if (offset + count > 0x3F82)
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values[pos+0x3F82-offset] ^= 1;
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if (offset > 0x83)
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return;
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if (offset + count > 0x83)
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values[pos+0x83-offset] ^= 3;
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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for (int i = 0; i < count; ++i)
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{
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values[pos+i] ^= 0xB6;
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}
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if (offset <= 0x3F82 && offset + count > 0x3F82)
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values[pos+0x3F82-offset] ^= 1;
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if (offset <= 0x83 && offset + count > 0x83)
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values[pos+0x83-offset] ^= 3;
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if (offset <= 0x103 && offset + count > 0x103)
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values[pos+0x103-offset]++;
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}
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}
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[Serializable]
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public class HashCrypt : ICrypt
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{
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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return (byte)(value ^ entry.Hash);
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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byte key = (byte)entry.Hash;
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for (int i = 0; i < count; ++i)
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{
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values[pos+i] ^= key;
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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Decrypt (entry, offset, values, pos, count);
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}
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}
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[Serializable]
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public class XorCrypt : ICrypt
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{
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private byte m_key;
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public byte Key
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{
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get { return m_key; }
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set { m_key = value; }
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}
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public XorCrypt (uint key)
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{
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m_key = (byte)key;
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}
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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return (byte)(value ^ m_key);
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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for (int i = 0; i < count; ++i)
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{
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values[pos+i] ^= m_key;
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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Decrypt (entry, offset, values, pos, count);
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}
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}
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[Serializable]
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public class FlyingShineCrypt : ICrypt
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{
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static private byte Adjust (uint hash, out int shift)
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{
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shift = (int)(hash & 0xff);
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if (0 == shift) shift = 0x0f;
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byte key = (byte)(hash >> 8);
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if (0 == key) key = 0xf0;
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return key;
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}
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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int shift;
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byte xor = Adjust (entry.Hash, out shift);
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return Binary.RotByteR ((byte)(value ^ xor), shift);
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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int shift;
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byte xor = Adjust (entry.Hash, out shift);
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for (int i = 0; i < count; ++i)
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{
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byte data = (byte)(values[pos+i] ^ xor);
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values[pos+i] = Binary.RotByteR (data, shift);
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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int shift;
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byte xor = Adjust (entry.Hash, out shift);
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for (int i = 0; i < count; ++i)
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{
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byte data = Binary.RotByteL (values[pos+i], shift);
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values[pos+i] = (byte)(data ^ xor);
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}
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}
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}
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[Serializable]
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public class SeitenCrypt : ICrypt
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{
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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uint key = entry.Hash ^ (uint)offset;
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if (0 != (key & 2))
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{
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int ecx = (int)key & 0x18;
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value ^= (byte)((key >> ecx) | (key >> (ecx & 8)));
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}
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if (0 != (key & 4))
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{
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value += (byte)key;
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}
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if (0 != (key & 8))
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{
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value -= (byte)(key >> (int)(key & 0x10));
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}
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return value;
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
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{
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for (int i = 0; i < count; ++i)
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{
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int shift;
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uint key = entry.Hash ^ (uint)offset;
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byte v = buffer[pos+i];
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if (0 != (key & 2))
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{
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shift = (int)key & 0x18;
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uint ebx = key >> shift;
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shift &= 8;
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v ^= (byte)(ebx | (key >> shift));
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}
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if (0 != (key & 4))
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{
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v += (byte)key;
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}
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if (0 != (key & 8))
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{
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shift = (int)key & 0x10;
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v -= (byte)(key >> shift);
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}
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buffer[pos+i] = v;
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++offset;
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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for (int i = 0; i < count; ++i)
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{
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uint key = entry.Hash ^ (uint)offset;
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if (0 != (key & 8))
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{
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values[pos+i] += (byte)(key >> (int)(key & 0x10));
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}
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if (0 != (key & 4))
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{
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values[pos+i] -= (byte)key;
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}
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if (0 != (key & 2))
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{
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int ecx = (int)key & 0x18;
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values[pos+i] ^= (byte)((key >> ecx) | (key >> (ecx & 8)));
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}
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}
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}
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}
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[Serializable]
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public class OkibaCrypt : ICrypt
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{
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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if (offset < 0x65)
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return (byte)(value ^ (byte)(entry.Hash >> 4));
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uint key = entry.Hash;
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// 0,1,2,3 -> 1,0,3,2
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key = ((key & 0xff0000) << 8) | ((key & 0xff000000) >> 8)
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| ((key & 0xff00) >> 8) | ((key & 0xff) << 8);
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key >>= 8 * ((int)(offset - 0x65) & 3);
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return (byte)(value ^ (byte)key);
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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int i = 0;
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if (offset < 0x65)
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{
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uint key = entry.Hash >> 4;
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int limit = Math.Min (count, (int)(0x65 - offset));
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for (; i < limit; ++i)
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{
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values[pos+i] ^= (byte)key;
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++offset;
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}
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}
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if (i < count)
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{
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offset -= 0x65;
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uint key = entry.Hash;
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key = ((key & 0xff0000) << 8) | ((key & 0xff000000) >> 8)
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| ((key & 0xff00) >> 8) | ((key & 0xff) << 8);
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do
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{
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values[pos+i] ^= (byte)(key >> (8 * ((int)offset & 3)));
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++offset;
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}
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while (++i < count);
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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Decrypt (entry, offset, values, pos, count);
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}
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}
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[Serializable]
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public class DieselmineCrypt : ICrypt
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{
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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byte key = (byte)entry.Hash;
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if (offset < 123)
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value ^= (byte)(21 * key);
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else if (offset < 246)
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value += (byte)(-32 * key);
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else if (offset < 369)
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value ^= (byte)(43 * key);
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else if (offset <= 0xffffffffL)
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value += (byte)(-54 * key);
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return value;
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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byte key = (byte)entry.Hash;
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for (int i = 0; i < count && offset <= 0xffffffffL; ++i, ++offset)
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{
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if (offset < 123)
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values[pos+i] ^= (byte)(21 * key);
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else if (offset < 246)
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values[pos+i] += (byte)(-32 * key);
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else if (offset < 369)
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values[pos+i] ^= (byte)(43 * key);
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else
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values[pos+i] += (byte)(-54 * key);
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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byte key = (byte)entry.Hash;
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for (int i = 0; i < count && offset <= 0xffffffffL; ++i, ++offset)
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{
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if (offset < 123)
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values[pos+i] ^= (byte)(21 * key);
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else if (offset < 246)
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values[pos+i] -= (byte)(-32 * key);
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else if (offset < 369)
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values[pos+i] ^= (byte)(43 * key);
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else
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values[pos+i] -= (byte)(-54 * key);
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}
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}
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}
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[Serializable]
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public class DameganeCrypt : ICrypt
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{
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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if (0 != (offset & 1))
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return (byte)(value ^ entry.Hash);
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else
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return (byte)(value ^ offset);
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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for (int i = 0; i < count; ++i, ++offset)
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{
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if (0 != (offset & 1))
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values[pos+i] ^= (byte)entry.Hash;
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else
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values[pos+i] ^= (byte)offset;
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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Decrypt (entry, offset, values, pos, count);
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}
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}
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[Serializable]
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public class GakuenButouCrypt : ICrypt
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{
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public override byte Decrypt (Xp3Entry entry, long offset, byte value)
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{
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if (0 != (offset & 1))
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return (byte)(value ^ offset);
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else
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return (byte)(value ^ entry.Hash);
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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for (int i = 0; i < count; ++i, ++offset)
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{
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if (0 != (offset & 1))
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values[pos+i] ^= (byte)offset;
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else
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values[pos+i] ^= (byte)entry.Hash;
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}
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}
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public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
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{
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Decrypt (entry, offset, values, pos, count);
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}
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}
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[Serializable]
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public class AlteredPinkCrypt : ICrypt
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{
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static readonly byte[] KeyTable = {
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0x43, 0xF8, 0xAD, 0x08, 0xDF, 0xB7, 0x26, 0x44, 0xF0, 0xD9, 0xE9, 0x24, 0x1A, 0xC1, 0xEE, 0xB4,
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0x11, 0x4B, 0xE4, 0xAF, 0x01, 0x5B, 0xF0, 0xAB, 0x6A, 0x70, 0x78, 0x84, 0xB0, 0x78, 0x4F, 0xED,
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0x39, 0x52, 0x69, 0xAF, 0xC4, 0x92, 0x2A, 0x21, 0xDE, 0xDC, 0x6E, 0x63, 0x9D, 0x9B, 0x63, 0xE1,
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0xB1, 0x94, 0x40, 0x6E, 0x3A, 0x52, 0x5A, 0x28, 0x08, 0x4D, 0xFB, 0x22, 0x18, 0xEB, 0xBA, 0x98,
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0x49, 0x77, 0xBF, 0xAA, 0x43, 0x75, 0xF5, 0xD3, 0x83, 0x71, 0x58, 0xA4, 0xAF, 0x1B, 0x53, 0x99,
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0x8A, 0x27, 0x5B, 0xC2, 0x7F, 0x7A, 0xCD, 0x8D, 0x33, 0x59, 0xEB, 0xA6, 0xFA, 0x7C, 0x00, 0x19,
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0xC4, 0xAA, 0x24, 0xF8, 0x84, 0xCD, 0xF7, 0x20, 0x4B, 0xAB, 0xF1, 0xD5, 0x01, 0x6F, 0x7C, 0x91,
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0x08, 0x7D, 0x8D, 0x89, 0x7C, 0x71, 0x65, 0x99, 0x9B, 0x6F, 0x3A, 0x1C, 0x49, 0xE3, 0xAF, 0x1F,
|
|
0xC6, 0xA5, 0x79, 0xFE, 0xAE, 0xA1, 0xCA, 0x59, 0x3C, 0xEE, 0xC1, 0x02, 0xBD, 0x2B, 0x8E, 0xC5,
|
|
0x7D, 0x38, 0x80, 0x8F, 0x72, 0xF3, 0x86, 0x5D, 0xF4, 0x20, 0x0A, 0x5B, 0xA0, 0xE3, 0x85, 0xB5,
|
|
0x67, 0x43, 0x96, 0xBB, 0x75, 0x86, 0x8D, 0x7E, 0x7E, 0xE6, 0xAA, 0x18, 0x57, 0xC4, 0xAA, 0x87,
|
|
0xDC, 0x74, 0x05, 0xAA, 0xBD, 0x5E, 0x4F, 0xA9, 0xB5, 0x5E, 0xC5, 0xE8, 0x11, 0x6D, 0x68, 0x89,
|
|
0x17, 0x7C, 0x10, 0x05, 0xA2, 0xBA, 0x43, 0x01, 0xD6, 0xFD, 0x26, 0x19, 0x57, 0xFA, 0x4D, 0x01,
|
|
0xB0, 0xED, 0x3A, 0x55, 0xEB, 0x65, 0x8E, 0xD1, 0x58, 0x27, 0xAD, 0xA1, 0x5E, 0x57, 0x3F, 0xA0,
|
|
0xEF, 0x59, 0x3E, 0xA4, 0xEB, 0x12, 0x15, 0x60, 0xBE, 0x95, 0x61, 0x0B, 0x98, 0xF5, 0xF4, 0x12,
|
|
0x1C, 0xD8, 0x62, 0x3F, 0xFD, 0xCF, 0x01, 0x3A, 0xE7, 0xC2, 0x19, 0x38, 0x6C, 0xC3, 0x90, 0x3E,
|
|
};
|
|
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)(value ^ KeyTable[offset & 0xFF]);
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= KeyTable[(offset+i) & 0xFF];
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class NatsupochiCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)(value ^ (entry.Hash >> 3));
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
byte key = (byte)(entry.Hash >> 3);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= key;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class PoringSoftCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)~(value ^ (entry.Hash + 1));
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
byte key = (byte)~(entry.Hash + 1);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= key;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class AppliqueCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return offset < 5 ? value : (byte)(value ^ (entry.Hash >> 12));
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
if (offset < 5)
|
|
{
|
|
int skip = Math.Min (5 - (int)offset, count);
|
|
offset += skip;
|
|
pos += skip;
|
|
count -= skip;
|
|
}
|
|
byte key = (byte)(entry.Hash >> 12);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= key;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class TokidokiCrypt : ICrypt
|
|
{
|
|
public override bool HashAfterCrypt { get { return true; } }
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
uint key;
|
|
uint limit = GetParameters (entry, out key);
|
|
for (int i = 0; i < count && offset < limit; ++i, ++offset)
|
|
{
|
|
values[pos+i] ^= (byte)(key >> (((int)offset & 3) << 3));
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
|
|
uint GetParameters (Xp3Entry entry, out uint key)
|
|
{
|
|
var ext = System.IO.Path.GetExtension (entry.Name);
|
|
if (!string.IsNullOrEmpty (ext))
|
|
{
|
|
ext = ext.ToLowerInvariant();
|
|
var ext_bin = new byte[16];
|
|
Encodings.cp932.GetBytes (ext, 0, Math.Min (4, ext.Length), ext_bin, 0);
|
|
key = ~LittleEndian.ToUInt32 (ext_bin, 0);
|
|
if (".asd\0.ks\0.tjs\0".Contains (ext+'\0'))
|
|
return entry.Size;
|
|
}
|
|
else
|
|
key = uint.MaxValue;
|
|
return Math.Min (entry.Size, 0x100u);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class SourireCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)(value ^ entry.Hash ^ 0xCD);
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
byte key = (byte)(entry.Hash ^ 0xCD);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= key;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class HibikiCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
if (0 != (offset & 4) || offset <= 0x64)
|
|
return (byte)(value ^ (entry.Hash >> 5));
|
|
else
|
|
return (byte)(value ^ (entry.Hash >> 8));
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
|
|
{
|
|
byte key1 = (byte)(entry.Hash >> 5);
|
|
byte key2 = (byte)(entry.Hash >> 8);
|
|
for (int i = 0; i < count; ++i, ++offset)
|
|
{
|
|
if (0 != (offset & 4) || offset <= 0x64)
|
|
buffer[pos+i] ^= key1;
|
|
else
|
|
buffer[pos+i] ^= key2;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, buffer, pos, count);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class AkabeiCrypt : ICrypt
|
|
{
|
|
private readonly uint m_seed;
|
|
|
|
public AkabeiCrypt (uint seed)
|
|
{
|
|
m_seed = seed;
|
|
}
|
|
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
int key_pos = (int)offset & 0x1F;
|
|
var key = GetKey (entry.Hash).ElementAt (key_pos);
|
|
return (byte)(value ^ key);
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
|
|
{
|
|
var key = GetKey (entry.Hash).ToArray();
|
|
int key_pos = (int)offset;
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
buffer[pos+i] ^= key[key_pos++ & 0x1F];
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, buffer, pos, count);
|
|
}
|
|
|
|
IEnumerable<byte> GetKey (uint hash)
|
|
{
|
|
hash = (hash ^ m_seed) & 0x7FFFFFFF;
|
|
hash = hash << 31 | hash;
|
|
for (int i = 0; i < 0x20; ++i)
|
|
{
|
|
yield return (byte)hash;
|
|
hash = (hash & 0xFFFFFFFE) << 23 | hash >> 8;
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class HaikuoCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)(value ^ entry.Hash ^ (entry.Hash >> 8));
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
byte key = (byte)(entry.Hash ^ (entry.Hash >> 8));
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= key;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class StripeCrypt : ICrypt
|
|
{
|
|
readonly byte m_key;
|
|
|
|
public StripeCrypt (byte key)
|
|
{
|
|
m_key = key;
|
|
}
|
|
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)((value ^ m_key) + 1);
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= m_key;
|
|
values[pos+i] ++;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] --;
|
|
values[pos+i] ^= m_key;
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class ExaCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)(value ^ (entry.Hash >> (int)((uint)offset % 5)));
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
int shift = (int)(offset % 5);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= (byte)(entry.Hash >> ((shift+i) % 5));
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
}
|