mirror of
https://github.com/crskycode/GARbro.git
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737 lines
24 KiB
C#
737 lines
24 KiB
C#
//! \file WarcEncryption.cs
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//! \date Mon Aug 15 08:56:04 2016
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//! \brief ShiinaRio archives encryption.
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//
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// Copyright (C) 2015-2016 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.Runtime.InteropServices;
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using GameRes.Utility;
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namespace GameRes.Formats.ShiinaRio
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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 string Name { get; set; }
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public string OriginalTitle { get; set; }
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public int Version { get; set; }
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public int EntryNameSize;
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public byte[] CryptKey;
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public uint[] HelperKey;
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public byte[] ShiinaImage;
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public byte[] Region;
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public byte[] DecodeBin;
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public IDecryptExtra ExtraCrypt;
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}
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internal class Decoder
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{
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EncryptionScheme m_scheme;
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public int SchemeVersion { get { return m_scheme.Version; } }
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public int WarcVersion { get; private set; }
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public uint MaxIndexLength { get; private set; }
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public int EntryNameSize { get { return m_scheme.EntryNameSize; } }
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public IDecryptExtra ExtraCrypt { get { return m_scheme.ExtraCrypt; } }
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private uint Rand { get; set; }
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public Decoder (int version, EncryptionScheme scheme)
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{
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m_scheme = scheme;
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WarcVersion = version;
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MaxIndexLength = GetMaxIndexLength (version);
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}
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public void Decrypt (byte[] data, int index, uint data_length)
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{
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if (data_length < 3)
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return;
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uint effective_length = Math.Min (data_length, 1024u);
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int a, b;
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uint fac = 0;
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if (WarcVersion > 120)
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{
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Rand = data_length;
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a = (sbyte)data[index] ^ (sbyte)data_length;
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b = (sbyte)data[index+1] ^ (sbyte)(data_length / 2);
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if (data_length != MaxIndexLength)
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{
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// ... regular entry decryption
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int idx = (int)((double)NextRand() * (m_scheme.ShiinaImage.Length / 4294967296.0));
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if (WarcVersion >= 160)
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{
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fac = Rand + m_scheme.ShiinaImage[idx];
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fac = DecryptHelper3 (fac) & 0xfffffff;
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if (effective_length > 0x80)
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{
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DecryptHelper4 (data, index+4, m_scheme.HelperKey);
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index += 0x80;
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effective_length -= 0x80;
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}
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}
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else if (150 == WarcVersion)
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{
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fac = Rand + m_scheme.ShiinaImage[idx];
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fac ^= (fac & 0xfff) * (fac & 0xfff);
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uint v = 0;
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for (int i = 0; i < 32; ++i)
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{
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uint bit = fac & 1;
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fac >>= 1;
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if (0 != bit)
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v += fac;
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}
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fac = v;
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}
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else if (140 == WarcVersion)
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{
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fac = m_scheme.ShiinaImage[idx];
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}
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else if (130 == WarcVersion)
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{
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fac = m_scheme.ShiinaImage[idx & 0xff];
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}
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}
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}
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else
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{
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a = data[index];
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b = data[index+1];
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}
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Rand ^= (uint)(DecryptHelper1 (a) * 100000000.0);
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double token = 0.0;
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if (0 != (a|b))
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{
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token = Math.Acos ((double)a / Math.Sqrt ((double)(a*a + b*b)));
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token = token / Math.PI * 180.0;
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}
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if (b < 0)
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token = 360.0 - token;
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uint x = (fac + (byte)DecryptHelper2 (token)) % (uint)m_scheme.CryptKey.Length;
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int n = 0;
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for (int i = 2; i < effective_length; ++i)
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{
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byte d = data[index+i];
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if (WarcVersion > 120)
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d ^= (byte)((double)NextRand() / 16777216.0);
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else
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d ^= (byte)((double)NextRand() / 4294967296.0); // ? effectively a no-op
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d = (byte)(((d & 1) << 7) | (d >> 1));
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d ^= (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]);
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data[index+i] = d;
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x = d % (uint)m_scheme.CryptKey.Length;
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if (n >= m_scheme.CryptKey.Length)
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n = 0;
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}
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}
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public void DecryptIndex (uint index_offset, byte[] enc_index)
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{
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Decrypt (enc_index, 0, (uint)enc_index.Length);
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unsafe
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{
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fixed (byte* buf_raw = enc_index)
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{
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uint* encoded = (uint*)buf_raw;
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for (int i = 0; i < enc_index.Length/4; ++i)
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encoded[i] ^= index_offset;
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if (WarcVersion >= 170)
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{
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byte key = (byte)~WarcVersion;
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for (int i = 0; i < enc_index.Length; ++i)
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buf_raw[i] ^= key;
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}
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}
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}
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}
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public void Decrypt2 (byte[] data, int index, uint length)
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{
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if (length < 0x400 || null == m_scheme.DecodeBin)
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return;
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uint crc = 0xffffffff;
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for (int i = 0; i < 0x100; ++i)
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{
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crc ^= (uint)data[index++] << 24;
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for (int j = 0; j < 8; ++j)
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{
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uint bit = crc & 0x80000000u;
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crc <<= 1;
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if (0 != bit)
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crc ^= 0x04c11db7;
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}
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}
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for (int i = 0; i < 0x40; ++i)
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{
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uint src = LittleEndian.ToUInt32 (data, index) & 0x1ffcu;
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src = LittleEndian.ToUInt32 (m_scheme.DecodeBin, (int)src);
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uint key = src ^ crc;
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data[index++ + 0x100] ^= (byte)key;
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data[index++ + 0x100] ^= (byte)(key >> 8);
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data[index++ + 0x100] ^= (byte)(key >> 16);
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data[index++ + 0x100] ^= (byte)(key >> 24);
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}
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}
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double DecryptHelper1 (double a)
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{
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if (a < 0)
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return -DecryptHelper1 (-a);
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double v0;
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double v1;
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if (a < 18.0)
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{
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v0 = a;
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v1 = a;
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double v2 = -(a * a);
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for (int j = 3; j < 1000; j += 2)
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{
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v1 *= v2 / (j * (j - 1));
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v0 += v1 / j;
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if (v0 == v2)
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break;
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}
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return v0;
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}
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int flags = 0;
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double v0_l = 0;
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v1 = 0;
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double div = 1 / a;
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double v1_h = 2.0;
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double v0_h = 2.0;
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double v1_l = 0;
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v0 = 0;
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int i = 0;
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do
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{
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v0 += div;
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div *= ++i / a;
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if (v0 < v0_h)
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v0_h = v0;
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else
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flags |= 1;
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v1 += div;
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div *= ++i / a;
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if (v1 < v1_h)
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v1_h = v1;
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else
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flags |= 2;
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v0 -= div;
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div *= ++i / a;
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if (v0 > v0_l)
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v0_l = v0;
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else
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flags |= 4;
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v1 -= div;
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div *= ++i / a;
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if (v1 > v1_l)
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v1_l = v1;
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else
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flags |= 8;
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}
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while (flags != 0xf);
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return ((Math.PI - Math.Cos(a) * (v0_l + v0_h)) - (Math.Sin(a) * (v1_l + v1_h))) / 2.0;
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}
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uint DecryptHelper2 (double a)
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{
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double v0, v1, v2, v3;
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if (a > 1.0)
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{
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v0 = Math.Sqrt (a * 2 - 1);
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for (;;)
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{
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v1 = 1 - (double)NextRand() / 4294967296.0;
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v2 = 2.0 * (double)NextRand() / 4294967296.0 - 1.0;
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if (v1 * v1 + v2 * v2 > 1.0)
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continue;
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v2 /= v1;
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v3 = v2 * v0 + a - 1.0;
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if (v3 <= 0)
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continue;
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v1 = (a - 1.0) * Math.Log (v3 / (a - 1.0)) - v2 * v0;
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if (v1 < -50.0)
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continue;
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if (((double)NextRand() / 4294967296.0) <= (Math.Exp(v1) * (v2 * v2 + 1.0)))
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break;
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}
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}
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else
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{
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v0 = Math.Exp(1.0) / (a + Math.Exp(1.0));
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do
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{
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v1 = (double)NextRand() / 4294967296.0;
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v2 = (double)NextRand() / 4294967296.0;
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if (v1 < v0)
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{
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v3 = Math.Pow(v2, 1.0 / a);
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v1 = Math.Exp(-v3);
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} else
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{
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v3 = 1.0 - Math.Log(v2);
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v1 = Math.Pow(v3, a - 1.0);
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}
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}
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while ((double)NextRand() / 4294967296.0 >= v1);
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}
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if (WarcVersion > 120)
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return (uint)(v3 * 256.0);
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else
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return (byte)((double)NextRand() / 4294967296.0);
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}
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[StructLayout(LayoutKind.Explicit)]
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struct Union
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{
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[FieldOffset(0)]
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public int i;
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[FieldOffset (0)]
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public uint u;
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[FieldOffset(0)]
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public float f;
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[FieldOffset(0)]
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public byte b0;
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[FieldOffset(1)]
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public byte b1;
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[FieldOffset(2)]
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public byte b2;
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[FieldOffset(3)]
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public byte b3;
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}
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uint DecryptHelper3 (uint key)
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{
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var p = new Union();
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p.u = key;
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var fv = new Union();
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fv.f = (float)(1.5 * (double)p.b0 + 0.1);
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uint v0 = Binary.BigEndian (fv.u);
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fv.f = (float)(1.5 * (double)p.b1 + 0.1);
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uint v1 = (uint)fv.f;
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fv.f = (float)(1.5 * (double)p.b2 + 0.1);
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uint v2 = (uint)-fv.i;
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fv.f = (float)(1.5 * (double)p.b3 + 0.1);
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uint v3 = ~fv.u;
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return ((v0 + v1) | (v2 - v3));
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}
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void DecryptHelper4 (byte[] data, int index, uint[] key_src)
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{
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uint[] buf = new uint[0x50];
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int i;
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for (i = 0; i < 0x10; ++i)
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{
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buf[i] = BigEndian.ToUInt32 (data, index+40+4*i);
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}
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for (; i < 0x50; ++i)
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{
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uint v = buf[i-16];
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v ^= buf[i-14];
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v ^= buf[i-8];
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v ^= buf[i-3];
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v = v << 1 | v >> 31;
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buf[i] = v;
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}
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uint[] key = new uint[10];
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Array.Copy (key_src, key, 5);
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uint k0 = key[0];
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uint k1 = key[1];
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uint k2 = key[2];
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uint k3 = key[3];
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uint k4 = key[4];
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uint pc = 0;
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uint v26 = 0;
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int buf_idx = 0;
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for (int ebp = 0; ebp < 0x50; ++ebp)
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{
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if (ebp >= 0x10)
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{
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if (ebp >= 0x20)
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{
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if (ebp >= 0x30)
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{
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uint v27 = ~k3;
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if (ebp >= 0x40)
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{
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v26 = k1 ^ (k2 | v27);
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pc = 0xA953FD4E;
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}
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else
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{
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v26 = k1 & k3 | k2 & v27;
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pc = 0x8F1BBCDC;
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}
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}
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else
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{
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v26 = k3 ^ (k1 | ~k2);
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pc = 0x6ED9EBA1;
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}
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}
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else
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{
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v26 = k1 & k2 | k3 & ~k1;
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pc = 0x5A827999;
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}
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}
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else
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{
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v26 = k1 ^ k2 ^ k3;
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pc = 0;
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}
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uint v28 = buf[buf_idx] + k4 + v26 + pc + (k0 << 5 | k0 >> 27);
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uint v29 = (k1 >> 2) | (k1 << 30);
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k1 = k0;
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k4 = k3;
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k3 = k2;
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k2 = v29;
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k0 = v28;
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++buf_idx;
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}
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key[0] += k0;
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key[1] += k1;
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key[2] += k2;
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key[3] += k3;
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key[4] += k4;
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var ft = new FILETIME {
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DateTimeLow = key[1],
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DateTimeHigh = key[0] & 0x7FFFFFFF
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};
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var sys_time = new SYSTEMTIME (ft);
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key[5] = (uint)(sys_time.Year | sys_time.Month << 16);
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key[7] = (uint)(sys_time.Hour | sys_time.Minute << 16);
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key[8] = (uint)(sys_time.Second | sys_time.Milliseconds << 16);
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uint flags = LittleEndian.ToUInt32 (data, index+40) | 0x80000000;
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uint rgb = buf[1] >> 8; // BigEndian.ToUInt32 (data, index+44) >> 8;
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if (0 == (flags & 0x78000000))
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flags |= 0x98000000;
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key[6] = RegionCrc32 (m_scheme.Region, flags, rgb);
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key[9] = (uint)(((int)key[2] * (long)(int)key[3]) >> 8);
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if (m_scheme.Version >= 2390)
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key[6] += key[9];
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unsafe
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{
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fixed (byte* data_fixed = data)
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{
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uint* encoded = (uint*)(data_fixed+index);
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for (i = 0; i < 10; ++i)
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{
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encoded[i] ^= key[i];
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}
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}
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}
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}
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static readonly uint[] CustomCrcTable = InitCrcTable();
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static uint[] InitCrcTable ()
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{
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var table = new uint[0x100];
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for (uint i = 0; i != 256; ++i)
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{
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uint poly = i;
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for (int j = 0; j < 8; ++j)
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{
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uint bit = poly & 1;
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poly = Binary.RotR (poly, 1);
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if (0 == bit)
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poly ^= 0x6DB88320;
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}
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table[i] = poly;
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}
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return table;
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}
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uint RegionCrc32 (byte[] src, uint flags, uint rgb)
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{
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int src_alpha = (int)flags & 0x1ff;
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int dst_alpha = (int)(flags >> 12) & 0x1ff;
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flags >>= 24;
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if (0 == (flags & 0x10))
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dst_alpha = 0;
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if (0 == (flags & 8))
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src_alpha = 0x100;
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int y_step = 0;
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int x_step = 4;
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int width = 48;
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int pos = 0;
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if (0 != (flags & 0x40)) // horizontal flip
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{
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y_step += width;
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pos += (width-1)*4;
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x_step = -x_step;
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}
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if (0 != (flags & 0x20)) // vertical flip
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{
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y_step -= width;
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pos += width*0x2f*4; // width*(height-1)*4;
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}
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y_step <<= 3;
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uint checksum = 0;
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for (int y = 0; y < 48; ++y)
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{
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for (int x = 0; x < 48; ++x)
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{
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int alpha = src[pos+3] * src_alpha;
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alpha >>= 8;
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uint color = rgb;
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for (int i = 0; i < 3; ++i)
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{
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int v = src[pos+i];
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int c = (int)(color & 0xff); // rgb[i];
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c -= v;
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c = (c * dst_alpha) >> 8;
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c = (c + v) & 0xff;
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c = (c * alpha) >> 8;
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checksum = (checksum >> 8) ^ CustomCrcTable[(c ^ checksum) & 0xff];
|
|
color >>= 8;
|
|
}
|
|
pos += x_step;
|
|
}
|
|
pos += y_step;
|
|
}
|
|
return checksum;
|
|
}
|
|
|
|
[StructLayout(LayoutKind.Sequential)]
|
|
private struct FILETIME
|
|
{
|
|
public uint DateTimeLow;
|
|
public uint DateTimeHigh;
|
|
}
|
|
|
|
[StructLayout(LayoutKind.Sequential)]
|
|
private struct SYSTEMTIME
|
|
{
|
|
[MarshalAs(UnmanagedType.U2)] public ushort Year;
|
|
[MarshalAs(UnmanagedType.U2)] public ushort Month;
|
|
[MarshalAs(UnmanagedType.U2)] public ushort DayOfWeek;
|
|
[MarshalAs(UnmanagedType.U2)] public ushort Day;
|
|
[MarshalAs(UnmanagedType.U2)] public ushort Hour;
|
|
[MarshalAs(UnmanagedType.U2)] public ushort Minute;
|
|
[MarshalAs(UnmanagedType.U2)] public ushort Second;
|
|
[MarshalAs(UnmanagedType.U2)] public ushort Milliseconds;
|
|
|
|
public SYSTEMTIME (FILETIME ft)
|
|
{
|
|
FileTimeToSystemTime (ref ft, out this);
|
|
}
|
|
|
|
[DllImport ("kernel32.dll", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
|
|
static extern bool FileTimeToSystemTime (ref FILETIME lpFileTime, out SYSTEMTIME lpSystemTime);
|
|
}
|
|
|
|
uint NextRand ()
|
|
{
|
|
Rand = 1566083941u * Rand + 1u;
|
|
return Rand;
|
|
}
|
|
|
|
uint GetMaxIndexLength (int version)
|
|
{
|
|
int max_index_entries = version < 150 ? 8192 : 16384;
|
|
return (uint)((m_scheme.EntryNameSize + 0x18) * max_index_entries);
|
|
}
|
|
|
|
public static EncryptionScheme[] KnownSchemes = new EncryptionScheme[0];
|
|
}
|
|
|
|
public interface IDecryptExtra
|
|
{
|
|
void Decrypt (byte[] data, int index, uint length, uint flags);
|
|
}
|
|
|
|
[Serializable]
|
|
public abstract class KeyDecryptBase : IDecryptExtra
|
|
{
|
|
protected readonly uint Seed;
|
|
protected readonly byte[] DecodeTable;
|
|
protected uint MinLength = 0x400;
|
|
|
|
public KeyDecryptBase (uint seed, byte[] decode_bin)
|
|
{
|
|
Seed = seed;
|
|
DecodeTable = decode_bin;
|
|
}
|
|
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < MinLength)
|
|
return;
|
|
if ((flags & 0x202) == 0x202)
|
|
DecryptPre (data, index, length);
|
|
if ((flags & 0x204) == 0x204)
|
|
DecryptPost (data, index, length);
|
|
}
|
|
|
|
protected abstract void DecryptPre (byte[] data, int index, uint length);
|
|
|
|
protected virtual void DecryptPost (byte[] data, int index, uint length)
|
|
{
|
|
data[index + 0x200] ^= (byte)Seed;
|
|
data[index + 0x201] ^= (byte)(Seed >> 8);
|
|
data[index + 0x202] ^= (byte)(Seed >> 16);
|
|
data[index + 0x203] ^= (byte)(Seed >> 24);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public abstract class KeyDecryptExtra : KeyDecryptBase
|
|
{
|
|
public KeyDecryptExtra (uint seed, byte[] decode_bin) : base (seed, decode_bin)
|
|
{
|
|
}
|
|
|
|
protected override void DecryptPre (byte[] data, int index, uint length)
|
|
{
|
|
var k = new uint[4];
|
|
InitKey (Seed, k);
|
|
for (int i = 0; i < 0xFF; ++i)
|
|
{
|
|
uint j = k[3] ^ (k[3] << 11) ^ k[0] ^ ((k[3] ^ (k[3] << 11) ^ (k[0] >> 11)) >> 8);
|
|
k[3] = k[2];
|
|
k[2] = k[1];
|
|
k[1] = k[0];
|
|
k[0] = j;
|
|
data[index + i] ^= DecodeTable[j % DecodeTable.Length];
|
|
}
|
|
}
|
|
|
|
protected abstract void InitKey (uint key, uint[] k);
|
|
}
|
|
|
|
[Serializable]
|
|
public class ShojoMamaCrypt : KeyDecryptExtra
|
|
{
|
|
public ShojoMamaCrypt (uint key, byte[] bin) : base (key, bin)
|
|
{
|
|
}
|
|
|
|
protected override void InitKey (uint key, uint[] k)
|
|
{
|
|
k[0] = key + 1;
|
|
k[1] = key + 4;
|
|
k[2] = key + 2;
|
|
k[3] = key + 3;
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class TestamentCrypt : KeyDecryptExtra // Shinigami no Testament
|
|
{
|
|
public TestamentCrypt (uint key, byte[] bin) : base (key, bin)
|
|
{
|
|
}
|
|
|
|
protected override void InitKey (uint key, uint[] k)
|
|
{
|
|
k[0] = key + 3;
|
|
k[1] = key + 2;
|
|
k[2] = key + 1;
|
|
k[3] = key;
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class MakiFesCrypt : KeyDecryptBase
|
|
{
|
|
public MakiFesCrypt (uint seed, byte[] key) : base (seed, key)
|
|
{
|
|
}
|
|
|
|
protected override void DecryptPre (byte[] data, int index, uint length)
|
|
{
|
|
uint k = Seed;
|
|
for (int i = 0; i < 0x100; ++i)
|
|
{
|
|
k = 0x343FD * k + 0x269EC3;
|
|
data[index+i] ^= DecodeTable[((int)(k >> 16) & 0x7FFF) % DecodeTable.Length];
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class MajimeCrypt : IDecryptExtra
|
|
{
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x200)
|
|
return;
|
|
if ((flags & 0x202) == 0x202)
|
|
{
|
|
int sum = 0;
|
|
int bit = 0;
|
|
byte v;
|
|
for (int i = 0; i < 0x100; ++i)
|
|
{
|
|
v = data[index+i];
|
|
sum += v >> 1;
|
|
data[index+i] = (byte)(v >> 1 | bit);
|
|
bit = v << 7;
|
|
}
|
|
data[index] |= (byte)bit;
|
|
data[index + 0x104] ^= (byte)sum;
|
|
data[index + 0x105] ^= (byte)(sum >> 8);
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class AlcotCrypt : IDecryptExtra
|
|
{
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x400)
|
|
return;
|
|
if ((flags & 0x204) == 0x204)
|
|
{
|
|
var crc16 = new Kogado.Crc16();
|
|
crc16.Update (data, index, (int)length & 0x7E | 1);
|
|
var sum = crc16.Value ^ 0xFFFF;
|
|
data[index + 0x104] ^= (byte)sum;
|
|
data[index + 0x105] ^= (byte)(sum >> 8);
|
|
}
|
|
}
|
|
}
|
|
}
|