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Code Issues Projects Releases Wiki Activity

(ShiinaRio): encryption-related classes moved to separate file.

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This commit is contained in:
morkt 2016-08-15 10:15:19 +04:00
parent e0406e983a
commit 5dfdf5f4d0
3 changed files with 688 additions and 604 deletions
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1
ArcFormats/ArcFormats.csproj
View File

@ -178,6 +178,7 @@
<Compile Include="RealLive\AudioOWP.cs" />
<Compile Include="RealLive\ImageG00.cs" />
<Compile Include="RealLive\ImagePDT.cs" />
<Compile Include="ShiinaRio\WarcEncryption.cs" />
<Compile Include="Silky\ImageZIT.cs" />
<Compile Include="SimpleEncryption.cs" />
<Compile Include="Slg\ArcSZS.cs" />

609
ArcFormats/ShiinaRio/ArcWARC.cs
View File

@ -2,7 +2,7 @@
//! \date Fri Apr 10 03:10:42 2015
//! \brief ShiinaRio engine archive format.
//
// Copyright (C) 2015 by morkt
// Copyright (C) 2015-2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
@ -28,7 +28,6 @@ using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using GameRes.Compression;
using GameRes.Formats.Properties;
using GameRes.Formats.Strings;
@ -160,8 +159,8 @@ namespace GameRes.Formats.ShiinaRio // 椎名里緒
if (0 != (wentry.Flags & 0x80000000u) && entry.Size > 8) // encrypted entry
warc.Decoder.Decrypt (enc_data, 8, entry.Size-8);
if (warc.Decoder.SchemeVersion >= 2490)
warc.Decoder.DecryptExtra (enc_data, 8, entry.Size-8, 0x202);
if (warc.Decoder.ExtraCrypt != null)
warc.Decoder.ExtraCrypt.Decrypt (enc_data, 8, entry.Size-8, 0x202);
if (0 != (wentry.Flags & 0x20000000u) && entry.Size > 8)
warc.Decoder.Decrypt2 (enc_data, 8, entry.Size-8);
@ -185,8 +184,8 @@ namespace GameRes.Formats.ShiinaRio // 椎名里緒
unpack (enc_data, unpacked);
if (0 != (wentry.Flags & 0x40000000))
warc.Decoder.Decrypt2 (unpacked, 0, (uint)unpacked.Length);
if (warc.Decoder.SchemeVersion >= 2490)
warc.Decoder.DecryptExtra (unpacked, 0, (uint)unpacked.Length, 0x204);
if (warc.Decoder.ExtraCrypt != null)
warc.Decoder.ExtraCrypt.Decrypt (unpacked, 0, (uint)unpacked.Length, 0x204);
}
return new MemoryStream (unpacked);
}
@ -545,602 +544,4 @@ namespace GameRes.Formats.ShiinaRio // 椎名里緒
return i;
}
}
[Serializable]
public class EncryptionScheme
{
public string Name { get; set; }
public string OriginalTitle { get; set; }
public int Version { get; set; }
public int EntryNameSize;
public byte[] CryptKey;
public uint[] HelperKey { get; set; }
public byte[] ShiinaImage;
public byte[] Region;
public byte[] DecodeBin;
public byte[] DecodeExtra;
}
internal class Decoder
{
EncryptionScheme m_scheme;
public int SchemeVersion { get { return m_scheme.Version; } }
public int WarcVersion { get; private set; }
public uint MaxIndexLength { get; private set; }
public int EntryNameSize { get { return m_scheme.EntryNameSize; } }
private uint Rand { get; set; }
public Decoder (int version, EncryptionScheme scheme)
{
m_scheme = scheme;
WarcVersion = version;
MaxIndexLength = GetMaxIndexLength (version);
}
public void Decrypt (byte[] data, int index, uint data_length)
{
if (data_length < 3)
return;
uint effective_length = Math.Min (data_length, 1024u);
int a, b;
uint fac = 0;
if (WarcVersion > 120)
{
Rand = data_length;
a = (sbyte)data[index] ^ (sbyte)data_length;
b = (sbyte)data[index+1] ^ (sbyte)(data_length / 2);
if (data_length != MaxIndexLength)
{
// ... regular entry decryption
int idx = (int)((double)NextRand() * (m_scheme.ShiinaImage.Length / 4294967296.0));
if (WarcVersion >= 160)
{
fac = Rand + m_scheme.ShiinaImage[idx];
fac = DecryptHelper3 (fac) & 0xfffffff;
if (effective_length > 0x80)
{
DecryptHelper4 (data, index+4, m_scheme.HelperKey);
index += 0x80;
effective_length -= 0x80;
}
}
else if (150 == WarcVersion)
{
fac = Rand + m_scheme.ShiinaImage[idx];
fac ^= (fac & 0xfff) * (fac & 0xfff);
uint v = 0;
for (int i = 0; i < 32; ++i)
{
uint bit = fac & 1;
fac >>= 1;
if (0 != bit)
v += fac;
}
fac = v;
}
else if (140 == WarcVersion)
{
fac = m_scheme.ShiinaImage[idx];
}
else if (130 == WarcVersion)
{
fac = m_scheme.ShiinaImage[idx & 0xff];
}
}
}
else
{
a = data[index];
b = data[index+1];
}
Rand ^= (uint)(DecryptHelper1 (a) * 100000000.0);
double token = 0.0;
if (0 != (a|b))
{
token = Math.Acos ((double)a / Math.Sqrt ((double)(a*a + b*b)));
token = token / Math.PI * 180.0;
}
if (b < 0)
token = 360.0 - token;
uint x = (fac + (byte)DecryptHelper2 (token)) % (uint)m_scheme.CryptKey.Length;
int n = 0;
for (int i = 2; i < effective_length; ++i)
{
byte d = data[index+i];
if (WarcVersion > 120)
d ^= (byte)((double)NextRand() / 16777216.0);
else
d ^= (byte)((double)NextRand() / 4294967296.0); // ? effectively a no-op
d = (byte)(((d & 1) << 7) | (d >> 1));
d ^= (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]);
data[index+i] = d;
x = d % (uint)m_scheme.CryptKey.Length;
if (n >= m_scheme.CryptKey.Length)
n = 0;
}
}
public void DecryptIndex (uint index_offset, byte[] enc_index)
{
Decrypt (enc_index, 0, (uint)enc_index.Length);
unsafe
{
fixed (byte* buf_raw = enc_index)
{
uint* encoded = (uint*)buf_raw;
for (int i = 0; i < enc_index.Length/4; ++i)
encoded[i] ^= index_offset;
if (WarcVersion >= 170)
{
byte key = (byte)~WarcVersion;
for (int i = 0; i < enc_index.Length; ++i)
buf_raw[i] ^= key;
}
}
}
}
public void Decrypt2 (byte[] data, int index, uint length)
{
if (length < 0x400 || null == m_scheme.DecodeBin)
return;
uint crc = 0xffffffff;
for (int i = 0; i < 0x100; ++i)
{
crc ^= (uint)data[index++] << 24;
for (int j = 0; j < 8; ++j)
{
uint bit = crc & 0x80000000u;
crc <<= 1;
if (0 != bit)
crc ^= 0x04c11db7;
}
}
for (int i = 0; i < 0x40; ++i)
{
uint src = LittleEndian.ToUInt32 (data, index) & 0x1ffcu;
src = LittleEndian.ToUInt32 (m_scheme.DecodeBin, (int)src);
uint key = src ^ crc;
data[index++ + 0x100] ^= (byte)key;
data[index++ + 0x100] ^= (byte)(key >> 8);
data[index++ + 0x100] ^= (byte)(key >> 16);
data[index++ + 0x100] ^= (byte)(key >> 24);
}
}
public void Decrypt3 (byte[] data, int index, uint length)
{
if (length < 0x400)
return;
int src = index;
uint key = 0;
for (uint i = (length & 0x7eu) + 1; i != 0; --i)
{
key ^= data[src++];
for (int j = 0; j < 8; ++j)
{
uint bit = key & 1;
key = bit << 15 | key >> 1;
if (0 == bit)
key ^= 0x408;
}
}
data[index+0x104] ^= (byte)key;
data[index+0x105] ^= (byte)(key >> 8);
}
public void DecryptExtra (byte[] data, int index, uint length, uint flags)
{
if (length < 0x400 || null == m_scheme.DecodeExtra)
return;
uint key = 0xECB2F5B2;
uint k0 = key + 1;
uint k3 = k0 + 2;
uint k2 = k0 + 1;
uint k1 = k0 + 3;
if ((flags & 0x202) == 0x202)
{
for (int i = 0; i < 0xFF; ++i)
{
uint j = k3 ^ (k3 << 11) ^ k0 ^ ((k3 ^ (k3 << 11) ^ (k0 >> 11)) >> 8);
k3 = k2;
k2 = k1;
k1 = k0;
k0 = j;
data[index + i] ^= m_scheme.DecodeExtra[j % m_scheme.DecodeExtra.Length];
}
}
if ((flags & 0x204) == 0x204)
{
data[index + 0x200] ^= (byte)key;
data[index + 0x201] ^= (byte)(key >> 8);
data[index + 0x202] ^= (byte)(key >> 16);
data[index + 0x203] ^= (byte)(key >> 24);
}
}
double DecryptHelper1 (double a)
{
if (a < 0)
return -DecryptHelper1 (-a);
double v0;
double v1;
if (a < 18.0)
{
v0 = a;
v1 = a;
double v2 = -(a * a);
for (int j = 3; j < 1000; j += 2)
{
v1 *= v2 / (j * (j - 1));
v0 += v1 / j;
if (v0 == v2)
break;
}
return v0;
}
int flags = 0;
double v0_l = 0;
v1 = 0;
double div = 1 / a;
double v1_h = 2.0;
double v0_h = 2.0;
double v1_l = 0;
v0 = 0;
int i = 0;
do
{
v0 += div;
div *= ++i / a;
if (v0 < v0_h)
v0_h = v0;
else
flags |= 1;
v1 += div;
div *= ++i / a;
if (v1 < v1_h)
v1_h = v1;
else
flags |= 2;
v0 -= div;
div *= ++i / a;
if (v0 > v0_l)
v0_l = v0;
else
flags |= 4;
v1 -= div;
div *= ++i / a;
if (v1 > v1_l)
v1_l = v1;
else
flags |= 8;
}
while (flags != 0xf);
return ((Math.PI - Math.Cos(a) * (v0_l + v0_h)) - (Math.Sin(a) * (v1_l + v1_h))) / 2.0;
}
uint DecryptHelper2 (double a)
{
double v0, v1, v2, v3;
if (a > 1.0)
{
v0 = Math.Sqrt (a * 2 - 1);
for (;;)
{
v1 = 1 - (double)NextRand() / 4294967296.0;
v2 = 2.0 * (double)NextRand() / 4294967296.0 - 1.0;
if (v1 * v1 + v2 * v2 > 1.0)
continue;
v2 /= v1;
v3 = v2 * v0 + a - 1.0;
if (v3 <= 0)
continue;
v1 = (a - 1.0) * Math.Log (v3 / (a - 1.0)) - v2 * v0;
if (v1 < -50.0)
continue;
if (((double)NextRand() / 4294967296.0) <= (Math.Exp(v1) * (v2 * v2 + 1.0)))
break;
}
}
else
{
v0 = Math.Exp(1.0) / (a + Math.Exp(1.0));
do
{
v1 = (double)NextRand() / 4294967296.0;
v2 = (double)NextRand() / 4294967296.0;
if (v1 < v0)
{
v3 = Math.Pow(v2, 1.0 / a);
v1 = Math.Exp(-v3);
} else
{
v3 = 1.0 - Math.Log(v2);
v1 = Math.Pow(v3, a - 1.0);
}
}
while ((double)NextRand() / 4294967296.0 >= v1);
}
if (WarcVersion > 120)
return (uint)(v3 * 256.0);
else
return (byte)((double)NextRand() / 4294967296.0);
}
[StructLayout(LayoutKind.Explicit)]
struct Union
{
[FieldOffset(0)]
public int i;
[FieldOffset (0)]
public uint u;
[FieldOffset(0)]
public float f;
[FieldOffset(0)]
public byte b0;
[FieldOffset(1)]
public byte b1;
[FieldOffset(2)]
public byte b2;
[FieldOffset(3)]
public byte b3;
}
uint DecryptHelper3 (uint key)
{
var p = new Union();
p.u = key;
var fv = new Union();
fv.f = (float)(1.5 * (double)p.b0 + 0.1);
uint v0 = Binary.BigEndian (fv.u);
fv.f = (float)(1.5 * (double)p.b1 + 0.1);
uint v1 = (uint)fv.f;
fv.f = (float)(1.5 * (double)p.b2 + 0.1);
uint v2 = (uint)-fv.i;
fv.f = (float)(1.5 * (double)p.b3 + 0.1);
uint v3 = ~fv.u;
return ((v0 + v1) | (v2 - v3));
}
void DecryptHelper4 (byte[] data, int index, uint[] key_src)
{
uint[] buf = new uint[0x50];
int i;
for (i = 0; i < 0x10; ++i)
{
buf[i] = BigEndian.ToUInt32 (data, index+40+4*i);
}
for (; i < 0x50; ++i)
{
uint v = buf[i-16];
v ^= buf[i-14];
v ^= buf[i-8];
v ^= buf[i-3];
v = v << 1 | v >> 31;
buf[i] = v;
}
uint[] key = new uint[10];
Array.Copy (key_src, key, 5);
uint k0 = key[0];
uint k1 = key[1];
uint k2 = key[2];
uint k3 = key[3];
uint k4 = key[4];
uint pc = 0;
uint v26 = 0;
int buf_idx = 0;
for (int ebp = 0; ebp < 0x50; ++ebp)
{
if (ebp >= 0x10)
{
if (ebp >= 0x20)
{
if (ebp >= 0x30)
{
uint v27 = ~k3;
if (ebp >= 0x40)
{
v26 = k1 ^ (k2 | v27);
pc = 0xA953FD4E;
}
else
{
v26 = k1 & k3 | k2 & v27;
pc = 0x8F1BBCDC;
}
}
else
{
v26 = k3 ^ (k1 | ~k2);
pc = 0x6ED9EBA1;
}
}
else
{
v26 = k1 & k2 | k3 & ~k1;
pc = 0x5A827999;
}
}
else
{
v26 = k1 ^ k2 ^ k3;
pc = 0;
}
uint v28 = buf[buf_idx] + k4 + v26 + pc + (k0 << 5 | k0 >> 27);
uint v29 = (k1 >> 2) | (k1 << 30);
k1 = k0;
k4 = k3;
k3 = k2;
k2 = v29;
k0 = v28;
++buf_idx;
}
key[0] += k0;
key[1] += k1;
key[2] += k2;
key[3] += k3;
key[4] += k4;
var ft = new FILETIME {
DateTimeLow = key[1],
DateTimeHigh = key[0] & 0x7FFFFFFF
};
var sys_time = new SYSTEMTIME (ft);
key[5] = (uint)(sys_time.Year | sys_time.Month << 16);
key[7] = (uint)(sys_time.Hour | sys_time.Minute << 16);
key[8] = (uint)(sys_time.Second | sys_time.Milliseconds << 16);
uint flags = LittleEndian.ToUInt32 (data, index+40) | 0x80000000;
// uint rgb = BigEndian.ToUInt32 (data, index+44) >> 8;
uint rgb = buf[1] >> 8;
if (0 == (flags & 0x78000000))
flags |= 0x98000000;
key[6] = RegionCrc32 (m_scheme.Region, flags, rgb);
key[9] = (uint)(((int)key[2] * (long)(int)key[3]) >> 8);
if (m_scheme.Version >= 2390)
key[6] += key[9];
unsafe
{
fixed (byte* data_fixed = data)
{
uint* encoded = (uint*)(data_fixed+index);
for (i = 0; i < 10; ++i)
{
encoded[i] ^= key[i];
}
}
}
}
static readonly uint[] CustomCrcTable = InitCrcTable();
static uint[] InitCrcTable ()
{
var table = new uint[0x100];
for (uint i = 0; i != 256; ++i)
{
uint poly = i;
for (int j = 0; j < 8; ++j)
{
uint bit = poly & 1;
poly = poly >> 1 | poly << 31; // ror 1
if (0 == bit)
poly ^= 0x6DB88320;
}
table[i] = poly;
}
return table;
}
uint RegionCrc32 (byte[] src, uint flags, uint rgb)
{
int src_alpha = (int)flags & 0x1ff;
int dst_alpha = (int)(flags >> 12) & 0x1ff;
flags >>= 24;
if (0 == (flags & 0x10))
dst_alpha = 0;
if (0 == (flags & 8))
src_alpha = 0x100;
int y_step = 0;
int x_step = 4;
int width = 48;
int pos = 0;
if (0 != (flags & 0x40)) // horizontal flip
{
y_step += width;
pos += (width-1)*4;
x_step = -x_step;
}
if (0 != (flags & 0x20)) // vertical flip
{
y_step -= width;
pos += width*0x2f*4; // width*(height-1)*4;
}
y_step <<= 3;
uint checksum = 0;
for (int y = 0; y < 48; ++y)
{
for (int x = 0; x < 48; ++x)
{
int alpha = src[pos+3] * src_alpha;
alpha >>= 8;
uint color = rgb;
for (int i = 0; i < 3; ++i)
{
int v = src[pos+i];
int c = (int)(color & 0xff); // rgb[i];
c -= v;
c = (c * dst_alpha) >> 8;
c = (c + v) & 0xff;
c = (c * alpha) >> 8;
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];
}
}

682
ArcFormats/ShiinaRio/WarcEncryption.cs Normal file
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@ -0,0 +1,682 @@
//! \file WarcEncryption.cs
//! \date Mon Aug 15 08:56:04 2016
//! \brief ShiinaRio archives encryption.
//
// Copyright (C) 2015-2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.Runtime.InteropServices;
using GameRes.Utility;
namespace GameRes.Formats.ShiinaRio
{
[Serializable]
public class EncryptionScheme
{
public string Name { get; set; }
public string OriginalTitle { get; set; }
public int Version { get; set; }
public int EntryNameSize;
public byte[] CryptKey;
public uint[] HelperKey;
public byte[] ShiinaImage;
public byte[] Region;
public byte[] DecodeBin;
public IDecryptExtra ExtraCrypt;
}
internal class Decoder
{
EncryptionScheme m_scheme;
public int SchemeVersion { get { return m_scheme.Version; } }
public int WarcVersion { get; private set; }
public uint MaxIndexLength { get; private set; }
public int EntryNameSize { get { return m_scheme.EntryNameSize; } }
public IDecryptExtra ExtraCrypt { get { return m_scheme.ExtraCrypt; } }
private uint Rand { get; set; }
public Decoder (int version, EncryptionScheme scheme)
{
m_scheme = scheme;
WarcVersion = version;
MaxIndexLength = GetMaxIndexLength (version);
}
public void Decrypt (byte[] data, int index, uint data_length)
{
if (data_length < 3)
return;
uint effective_length = Math.Min (data_length, 1024u);
int a, b;
uint fac = 0;
if (WarcVersion > 120)
{
Rand = data_length;
a = (sbyte)data[index] ^ (sbyte)data_length;
b = (sbyte)data[index+1] ^ (sbyte)(data_length / 2);
if (data_length != MaxIndexLength)
{
// ... regular entry decryption
int idx = (int)((double)NextRand() * (m_scheme.ShiinaImage.Length / 4294967296.0));
if (WarcVersion >= 160)
{
fac = Rand + m_scheme.ShiinaImage[idx];
fac = DecryptHelper3 (fac) & 0xfffffff;
if (effective_length > 0x80)
{
DecryptHelper4 (data, index+4, m_scheme.HelperKey);
index += 0x80;
effective_length -= 0x80;
}
}
else if (150 == WarcVersion)
{
fac = Rand + m_scheme.ShiinaImage[idx];
fac ^= (fac & 0xfff) * (fac & 0xfff);
uint v = 0;
for (int i = 0; i < 32; ++i)
{
uint bit = fac & 1;
fac >>= 1;
if (0 != bit)
v += fac;
}
fac = v;
}
else if (140 == WarcVersion)
{
fac = m_scheme.ShiinaImage[idx];
}
else if (130 == WarcVersion)
{
fac = m_scheme.ShiinaImage[idx & 0xff];
}
}
}
else
{
a = data[index];
b = data[index+1];
}
Rand ^= (uint)(DecryptHelper1 (a) * 100000000.0);
double token = 0.0;
if (0 != (a|b))
{
token = Math.Acos ((double)a / Math.Sqrt ((double)(a*a + b*b)));
token = token / Math.PI * 180.0;
}
if (b < 0)
token = 360.0 - token;
uint x = (fac + (byte)DecryptHelper2 (token)) % (uint)m_scheme.CryptKey.Length;
int n = 0;
for (int i = 2; i < effective_length; ++i)
{
byte d = data[index+i];
if (WarcVersion > 120)
d ^= (byte)((double)NextRand() / 16777216.0);
else
d ^= (byte)((double)NextRand() / 4294967296.0); // ? effectively a no-op
d = (byte)(((d & 1) << 7) | (d >> 1));
d ^= (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]);
data[index+i] = d;
x = d % (uint)m_scheme.CryptKey.Length;
if (n >= m_scheme.CryptKey.Length)
n = 0;
}
}
public void DecryptIndex (uint index_offset, byte[] enc_index)
{
Decrypt (enc_index, 0, (uint)enc_index.Length);
unsafe
{
fixed (byte* buf_raw = enc_index)
{
uint* encoded = (uint*)buf_raw;
for (int i = 0; i < enc_index.Length/4; ++i)
encoded[i] ^= index_offset;
if (WarcVersion >= 170)
{
byte key = (byte)~WarcVersion;
for (int i = 0; i < enc_index.Length; ++i)
buf_raw[i] ^= key;
}
}
}
}
public void Decrypt2 (byte[] data, int index, uint length)
{
if (length < 0x400 || null == m_scheme.DecodeBin)
return;
uint crc = 0xffffffff;
for (int i = 0; i < 0x100; ++i)
{
crc ^= (uint)data[index++] << 24;
for (int j = 0; j < 8; ++j)
{
uint bit = crc & 0x80000000u;
crc <<= 1;
if (0 != bit)
crc ^= 0x04c11db7;
}
}
for (int i = 0; i < 0x40; ++i)
{
uint src = LittleEndian.ToUInt32 (data, index) & 0x1ffcu;
src = LittleEndian.ToUInt32 (m_scheme.DecodeBin, (int)src);
uint key = src ^ crc;
data[index++ + 0x100] ^= (byte)key;
data[index++ + 0x100] ^= (byte)(key >> 8);
data[index++ + 0x100] ^= (byte)(key >> 16);
data[index++ + 0x100] ^= (byte)(key >> 24);
}
}
double DecryptHelper1 (double a)
{
if (a < 0)
return -DecryptHelper1 (-a);
double v0;
double v1;
if (a < 18.0)
{
v0 = a;
v1 = a;
double v2 = -(a * a);
for (int j = 3; j < 1000; j += 2)
{
v1 *= v2 / (j * (j - 1));
v0 += v1 / j;
if (v0 == v2)
break;
}
return v0;
}
int flags = 0;
double v0_l = 0;
v1 = 0;
double div = 1 / a;
double v1_h = 2.0;
double v0_h = 2.0;
double v1_l = 0;
v0 = 0;
int i = 0;
do
{
v0 += div;
div *= ++i / a;
if (v0 < v0_h)
v0_h = v0;
else
flags |= 1;
v1 += div;
div *= ++i / a;
if (v1 < v1_h)
v1_h = v1;
else
flags |= 2;
v0 -= div;
div *= ++i / a;
if (v0 > v0_l)
v0_l = v0;
else
flags |= 4;
v1 -= div;
div *= ++i / a;
if (v1 > v1_l)
v1_l = v1;
else
flags |= 8;
}
while (flags != 0xf);
return ((Math.PI - Math.Cos(a) * (v0_l + v0_h)) - (Math.Sin(a) * (v1_l + v1_h))) / 2.0;
}
uint DecryptHelper2 (double a)
{
double v0, v1, v2, v3;
if (a > 1.0)
{
v0 = Math.Sqrt (a * 2 - 1);
for (;;)
{
v1 = 1 - (double)NextRand() / 4294967296.0;
v2 = 2.0 * (double)NextRand() / 4294967296.0 - 1.0;
if (v1 * v1 + v2 * v2 > 1.0)
continue;
v2 /= v1;
v3 = v2 * v0 + a - 1.0;
if (v3 <= 0)
continue;
v1 = (a - 1.0) * Math.Log (v3 / (a - 1.0)) - v2 * v0;
if (v1 < -50.0)
continue;
if (((double)NextRand() / 4294967296.0) <= (Math.Exp(v1) * (v2 * v2 + 1.0)))
break;
}
}
else
{
v0 = Math.Exp(1.0) / (a + Math.Exp(1.0));
do
{
v1 = (double)NextRand() / 4294967296.0;
v2 = (double)NextRand() / 4294967296.0;
if (v1 < v0)
{
v3 = Math.Pow(v2, 1.0 / a);
v1 = Math.Exp(-v3);
} else
{
v3 = 1.0 - Math.Log(v2);
v1 = Math.Pow(v3, a - 1.0);
}
}
while ((double)NextRand() / 4294967296.0 >= v1);
}
if (WarcVersion > 120)
return (uint)(v3 * 256.0);
else
return (byte)((double)NextRand() / 4294967296.0);
}
[StructLayout(LayoutKind.Explicit)]
struct Union
{
[FieldOffset(0)]
public int i;
[FieldOffset (0)]
public uint u;
[FieldOffset(0)]
public float f;
[FieldOffset(0)]
public byte b0;
[FieldOffset(1)]
public byte b1;
[FieldOffset(2)]
public byte b2;
[FieldOffset(3)]
public byte b3;
}
uint DecryptHelper3 (uint key)
{
var p = new Union();
p.u = key;
var fv = new Union();
fv.f = (float)(1.5 * (double)p.b0 + 0.1);
uint v0 = Binary.BigEndian (fv.u);
fv.f = (float)(1.5 * (double)p.b1 + 0.1);
uint v1 = (uint)fv.f;
fv.f = (float)(1.5 * (double)p.b2 + 0.1);
uint v2 = (uint)-fv.i;
fv.f = (float)(1.5 * (double)p.b3 + 0.1);
uint v3 = ~fv.u;
return ((v0 + v1) | (v2 - v3));
}
void DecryptHelper4 (byte[] data, int index, uint[] key_src)
{
uint[] buf = new uint[0x50];
int i;
for (i = 0; i < 0x10; ++i)
{
buf[i] = BigEndian.ToUInt32 (data, index+40+4*i);
}
for (; i < 0x50; ++i)
{
uint v = buf[i-16];
v ^= buf[i-14];
v ^= buf[i-8];
v ^= buf[i-3];
v = v << 1 | v >> 31;
buf[i] = v;
}
uint[] key = new uint[10];
Array.Copy (key_src, key, 5);
uint k0 = key[0];
uint k1 = key[1];
uint k2 = key[2];
uint k3 = key[3];
uint k4 = key[4];
uint pc = 0;
uint v26 = 0;
int buf_idx = 0;
for (int ebp = 0; ebp < 0x50; ++ebp)
{
if (ebp >= 0x10)
{
if (ebp >= 0x20)
{
if (ebp >= 0x30)
{
uint v27 = ~k3;
if (ebp >= 0x40)
{
v26 = k1 ^ (k2 | v27);
pc = 0xA953FD4E;
}
else
{
v26 = k1 & k3 | k2 & v27;
pc = 0x8F1BBCDC;
}
}
else
{
v26 = k3 ^ (k1 | ~k2);
pc = 0x6ED9EBA1;
}
}
else
{
v26 = k1 & k2 | k3 & ~k1;
pc = 0x5A827999;
}
}
else
{
v26 = k1 ^ k2 ^ k3;
pc = 0;
}
uint v28 = buf[buf_idx] + k4 + v26 + pc + (k0 << 5 | k0 >> 27);
uint v29 = (k1 >> 2) | (k1 << 30);
k1 = k0;
k4 = k3;
k3 = k2;
k2 = v29;
k0 = v28;
++buf_idx;
}
key[0] += k0;
key[1] += k1;
key[2] += k2;
key[3] += k3;
key[4] += k4;
var ft = new FILETIME {
DateTimeLow = key[1],
DateTimeHigh = key[0] & 0x7FFFFFFF
};
var sys_time = new SYSTEMTIME (ft);
key[5] = (uint)(sys_time.Year | sys_time.Month << 16);
key[7] = (uint)(sys_time.Hour | sys_time.Minute << 16);
key[8] = (uint)(sys_time.Second | sys_time.Milliseconds << 16);
uint flags = LittleEndian.ToUInt32 (data, index+40) | 0x80000000;
uint rgb = buf[1] >> 8; // BigEndian.ToUInt32 (data, index+44) >> 8;
if (0 == (flags & 0x78000000))
flags |= 0x98000000;
key[6] = RegionCrc32 (m_scheme.Region, flags, rgb);
key[9] = (uint)(((int)key[2] * (long)(int)key[3]) >> 8);
if (m_scheme.Version >= 2390)
key[6] += key[9];
unsafe
{
fixed (byte* data_fixed = data)
{
uint* encoded = (uint*)(data_fixed+index);
for (i = 0; i < 10; ++i)
{
encoded[i] ^= key[i];
}
}
}
}
static readonly uint[] CustomCrcTable = InitCrcTable();
static uint[] InitCrcTable ()
{
var table = new uint[0x100];
for (uint i = 0; i != 256; ++i)
{
uint poly = i;
for (int j = 0; j < 8; ++j)
{
uint bit = poly & 1;
poly = Binary.RotR (poly, 1);
if (0 == bit)
poly ^= 0x6DB88320;
}
table[i] = poly;
}
return table;
}
uint RegionCrc32 (byte[] src, uint flags, uint rgb)
{
int src_alpha = (int)flags & 0x1ff;
int dst_alpha = (int)(flags >> 12) & 0x1ff;
flags >>= 24;
if (0 == (flags & 0x10))
dst_alpha = 0;
if (0 == (flags & 8))
src_alpha = 0x100;
int y_step = 0;
int x_step = 4;
int width = 48;
int pos = 0;
if (0 != (flags & 0x40)) // horizontal flip
{
y_step += width;
pos += (width-1)*4;
x_step = -x_step;
}
if (0 != (flags & 0x20)) // vertical flip
{
y_step -= width;
pos += width*0x2f*4; // width*(height-1)*4;
}
y_step <<= 3;
uint checksum = 0;
for (int y = 0; y < 48; ++y)
{
for (int x = 0; x < 48; ++x)
{
int alpha = src[pos+3] * src_alpha;
alpha >>= 8;
uint color = rgb;
for (int i = 0; i < 3; ++i)
{
int v = src[pos+i];
int c = (int)(color & 0xff); // rgb[i];
c -= v;
c = (c * dst_alpha) >> 8;
c = (c + v) & 0xff;
c = (c * alpha) >> 8;
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 KeyDecryptExtra : IDecryptExtra
{
readonly uint Key;
readonly byte[] DecodeTable;
public KeyDecryptExtra (uint key, byte[] decode_bin)
{
Key = key;
DecodeTable = decode_bin;
}
public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if (length < 0x400)
return;
if ((flags & 0x202) == 0x202)
{
var k = new uint[4];
InitKey (Key, 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];
}
}
if ((flags & 0x204) == 0x204)
{
data[index + 0x200] ^= (byte)Key;
data[index + 0x201] ^= (byte)(Key >> 8);
data[index + 0x202] ^= (byte)(Key >> 16);
data[index + 0x203] ^= (byte)(Key >> 24);
}
}
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 UnknownCrypt : IDecryptExtra
{
public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if (length < 0x400)
return;
int src = index;
uint key = 0;
for (uint i = (length & 0x7eu) + 1; i != 0; --i)
{
key ^= data[src++];
for (int j = 0; j < 8; ++j)
{
uint bit = key & 1;
key = bit << 15 | key >> 1;
if (0 == bit)
key ^= 0x408;
}
}
data[index+0x104] ^= (byte)key;
data[index+0x105] ^= (byte)(key >> 8);
}
}
}