mirror of
https://github.com/crskycode/GARbro.git
synced 2024-10-23 15:48:16 +08:00
1185 lines
38 KiB
C#
1185 lines
38 KiB
C#
//! \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[] Region;
|
|
public byte[] DecodeBin;
|
|
public IByteArray ShiinaImage;
|
|
public IDecryptExtra ExtraCrypt;
|
|
|
|
public static readonly EncryptionScheme Warc110 = new EncryptionScheme { EntryNameSize = 0x10 };
|
|
}
|
|
|
|
public interface IByteArray
|
|
{
|
|
int Length { get; }
|
|
byte this[int i] { get; }
|
|
}
|
|
|
|
public interface IDecryptExtra
|
|
{
|
|
void Decrypt (byte[] data, int index, uint length, uint flags);
|
|
void Encrypt (byte[] data, int index, uint length, uint flags);
|
|
}
|
|
|
|
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)
|
|
{
|
|
DoEncryption (data, index, data_length, DecryptContent);
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint data_length)
|
|
{
|
|
DoEncryption (data, index, data_length, EncryptContent);
|
|
}
|
|
|
|
public void DecryptIndex (uint index_offset, byte[] index)
|
|
{
|
|
Decrypt (index, 0, (uint)index.Length);
|
|
XorIndex (index_offset, index);
|
|
}
|
|
|
|
public void EncryptIndex (uint index_offset, byte[] index)
|
|
{
|
|
XorIndex (index_offset, index);
|
|
Encrypt (index, 0, (uint)index.Length);
|
|
}
|
|
|
|
void DecryptContent (int x, byte[] data, int index, uint length)
|
|
{
|
|
int n = 0;
|
|
for (int i = 2; i < length; ++i)
|
|
{
|
|
byte d = data[index+i];
|
|
if (WarcVersion > 120)
|
|
d ^= (byte)((double)NextRand() / 16777216.0);
|
|
d = Binary.RotByteR (d, 1);
|
|
d ^= (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]);
|
|
data[index+i] = d;
|
|
x = d % m_scheme.CryptKey.Length;
|
|
if (n >= m_scheme.CryptKey.Length)
|
|
n = 0;
|
|
}
|
|
}
|
|
|
|
void EncryptContent (int x, byte[] data, int index, uint length)
|
|
{
|
|
int n = 0;
|
|
for (int i = 2; i < length; ++i)
|
|
{
|
|
byte k = (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]);
|
|
byte d = data[index+i];
|
|
x = d % m_scheme.CryptKey.Length;
|
|
d ^= k;
|
|
d = Binary.RotByteL (d, 1);
|
|
if (WarcVersion > 120)
|
|
d ^= (byte)((double)NextRand() / 16777216.0);
|
|
data[index+i] = d;
|
|
if (n >= m_scheme.CryptKey.Length)
|
|
n = 0;
|
|
}
|
|
}
|
|
|
|
delegate void ContentEncryptor (int start_key, byte[] data, int index, uint length);
|
|
|
|
void DoEncryption (byte[] data, int index, uint data_length, ContentEncryptor encryptor)
|
|
{
|
|
if (data_length < 3 || WarcVersion < 120)
|
|
return;
|
|
uint effective_length = Math.Min (data_length, 1024u);
|
|
int a, b;
|
|
uint fac = 0;
|
|
Rand = data_length;
|
|
if (WarcVersion > 120)
|
|
{
|
|
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;
|
|
|
|
int x = (int)((fac + (byte)DecryptHelper2 (token)) % (uint)m_scheme.CryptKey.Length);
|
|
encryptor (x, data, index, effective_length);
|
|
}
|
|
|
|
unsafe void XorIndex (uint index_offset, byte[] index)
|
|
{
|
|
fixed (byte* buf_raw = index)
|
|
{
|
|
uint* encoded = (uint*)buf_raw;
|
|
for (int i = 0; i < index.Length/4; ++i)
|
|
encoded[i] ^= index_offset;
|
|
if (WarcVersion >= 170)
|
|
{
|
|
byte key = (byte)~WarcVersion;
|
|
for (int i = 0; i < 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 = Crc32Normal.UpdateCrc (0xFFFFFFFF, data, index, 0x100);
|
|
index += 0x100;
|
|
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];
|
|
buf[i] = Binary.RotL (v, 1);
|
|
}
|
|
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];
|
|
|
|
for (int buf_idx = 0; buf_idx < 0x50; ++buf_idx)
|
|
{
|
|
uint f, c;
|
|
if (buf_idx < 0x10)
|
|
{
|
|
f = k1 ^ k2 ^ k3;
|
|
c = 0;
|
|
}
|
|
else if (buf_idx < 0x20)
|
|
{
|
|
f = k1 & k2 | k3 & ~k1;
|
|
c = 0x5A827999;
|
|
}
|
|
else if (buf_idx < 0x30)
|
|
{
|
|
f = k3 ^ (k1 | ~k2);
|
|
c = 0x6ED9EBA1;
|
|
}
|
|
else if (buf_idx < 0x40)
|
|
{
|
|
f = k1 & k3 | k2 & ~k3;
|
|
c = 0x8F1BBCDC;
|
|
}
|
|
else
|
|
{
|
|
f = k1 ^ (k2 | ~k3);
|
|
c = 0xA953FD4E;
|
|
}
|
|
uint new_k0 = buf[buf_idx] + k4 + f + c + Binary.RotL (k0, 5);
|
|
uint new_k2 = Binary.RotR (k1, 2);
|
|
k1 = k0;
|
|
k4 = k3;
|
|
k3 = k2;
|
|
k2 = new_k2;
|
|
k0 = new_k0;
|
|
}
|
|
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];
|
|
}
|
|
|
|
[Serializable]
|
|
public class ImageArray : IByteArray
|
|
{
|
|
private byte[] m_common;
|
|
private byte[] m_extra;
|
|
private int m_common_length;
|
|
|
|
static readonly byte[] EmptyArray = new byte[0]; // Array.Empty<T>() available in .Net 4.6 only
|
|
|
|
public ImageArray (byte[] common) : this (common, common.Length, EmptyArray)
|
|
{
|
|
}
|
|
|
|
public ImageArray (byte[] common, byte[] extra) : this (common, common.Length, extra)
|
|
{
|
|
}
|
|
|
|
public ImageArray (byte[] common, int common_length, byte[] extra)
|
|
{
|
|
if (common_length > common.Length)
|
|
throw new IndexOutOfRangeException();
|
|
m_common = common;
|
|
m_extra = extra;
|
|
m_common_length = common_length;
|
|
}
|
|
|
|
public int Length { get { return m_common_length + m_extra.Length; } }
|
|
|
|
public byte this[int i]
|
|
{
|
|
get
|
|
{
|
|
if (i < m_common_length)
|
|
return m_common[i];
|
|
else
|
|
return m_extra[i - m_common_length];
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public abstract class KeyDecryptBase : IDecryptExtra
|
|
{
|
|
protected readonly uint Seed;
|
|
protected readonly byte[] DecodeTable;
|
|
protected uint MinLength = 0x400;
|
|
protected int PostDataOffset = 0x200;
|
|
|
|
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);
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < MinLength)
|
|
return;
|
|
if ((flags & 0x104) == 0x104)
|
|
DecryptPost (data, index, length);
|
|
if ((flags & 0x102) == 0x102)
|
|
DecryptPre (data, index, length);
|
|
}
|
|
|
|
protected abstract void DecryptPre (byte[] data, int index, uint length);
|
|
|
|
protected virtual void DecryptPost (byte[] data, int index, uint length)
|
|
{
|
|
int pos = index + PostDataOffset;
|
|
data[pos ] ^= (byte)Seed;
|
|
data[pos+1] ^= (byte)(Seed >> 8);
|
|
data[pos+2] ^= (byte)(Seed >> 16);
|
|
data[pos+3] ^= (byte)(Seed >> 24);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public abstract class KeyDecryptExtra : KeyDecryptBase
|
|
{
|
|
protected int EncryptedSize = 0xFF;
|
|
|
|
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 < EncryptedSize; ++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 YuruPlusCrypt : KeyDecryptExtra
|
|
{
|
|
public YuruPlusCrypt (uint key, byte[] bin) : base (key, bin)
|
|
{
|
|
EncryptedSize = 0x100;
|
|
PostDataOffset = 0x204;
|
|
}
|
|
|
|
protected override void InitKey (uint key, uint[] k)
|
|
{
|
|
k[0] = key + 4;
|
|
k[1] = key + 3;
|
|
k[2] = key + 2;
|
|
k[3] = key + 1;
|
|
}
|
|
}
|
|
|
|
[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;
|
|
for (int i = 0; i < 0x100; ++i)
|
|
{
|
|
byte 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);
|
|
}
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x200)
|
|
return;
|
|
if ((flags & 0x102) == 0x102)
|
|
{
|
|
int sum = 0;
|
|
int bit = 0;
|
|
for (int i = 0xFF; i >= 0; --i)
|
|
{
|
|
byte v = data[index+i];
|
|
sum += v & 0x7F;
|
|
data[index+i] = (byte)(v << 1 | bit);
|
|
bit = v >> 7;
|
|
}
|
|
data[index + 0xFF] |= (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 && (flags & 0x204) == 0x204)
|
|
Crc16Crypt (data, index, (int)length);
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length >= 0x400 && (flags & 0x104) == 0x104)
|
|
Crc16Crypt (data, index, (int)length);
|
|
}
|
|
|
|
void Crc16Crypt (byte[] data, int index, int length)
|
|
{
|
|
var crc16 = new Kogado.Crc16();
|
|
crc16.Update (data, index, length & 0x7E | 1);
|
|
var sum = crc16.Value ^ 0xFFFF;
|
|
data[index + 0x104] ^= (byte)sum;
|
|
data[index + 0x105] ^= (byte)(sum >> 8);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class DodakureCrypt : IDecryptExtra
|
|
{
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x200)
|
|
return;
|
|
if ((flags & 0x204) == 0x204)
|
|
{
|
|
if (0x718E958D == LittleEndian.ToUInt32 (data, index))
|
|
{
|
|
var input = new byte[0x200];
|
|
Buffer.BlockCopy (data, index, input, 0, 0x200);
|
|
int remaining = LittleEndian.ToInt32 (input, 8);
|
|
int src = 12;
|
|
int dst = index;
|
|
bool rle = false;
|
|
while (remaining > 0)
|
|
{
|
|
int count = input[src++];
|
|
if (rle)
|
|
{
|
|
byte v = data[dst-1];
|
|
for (int i = 0; i < count; ++i)
|
|
data[dst++] = v;
|
|
}
|
|
else
|
|
{
|
|
Buffer.BlockCopy (input, src, data, dst, count);
|
|
src += count;
|
|
dst += count;
|
|
}
|
|
remaining -= count;
|
|
if (count < 0xFF)
|
|
rle = !rle;
|
|
}
|
|
}
|
|
if (length > 0x200)
|
|
data[index + 0x200] ^= (byte)length;
|
|
if (length > 0x201)
|
|
data[index + 0x201] ^= (byte)(length >> 8);
|
|
if (length > 0x202)
|
|
data[index + 0x202] ^= (byte)(length >> 16);
|
|
if (length > 0x203)
|
|
data[index + 0x203] ^= (byte)(length >> 24);
|
|
}
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x200)
|
|
return;
|
|
if ((flags & 0x104) == 0x104)
|
|
{
|
|
throw new NotImplementedException();
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class JokersCrypt : IDecryptExtra
|
|
{
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x400)
|
|
return;
|
|
if ((flags & 0x204) == 0x204)
|
|
{
|
|
if (0x718E958D == LittleEndian.ToUInt32 (data, index))
|
|
{
|
|
var input = new byte[0x200];
|
|
Buffer.BlockCopy (data, index, input, 0, 0x200);
|
|
int remaining = LittleEndian.ToInt32 (input, 8);
|
|
int src = 12;
|
|
int dst = index;
|
|
var ranges_hi = new uint[0x100];
|
|
var ranges_lo = new uint[0x101];
|
|
for (int i = 0; i < 0x100; ++i)
|
|
{
|
|
uint v = input[src++];
|
|
ranges_hi[i] = v;
|
|
ranges_lo[i+1] = v + ranges_lo[i];
|
|
}
|
|
uint denominator = ranges_lo[0x100];
|
|
var symbol_table = new byte[denominator];
|
|
uint low, high;
|
|
for (int i = 0; i < 0x100; ++i)
|
|
{
|
|
low = ranges_lo[i];
|
|
high = ranges_lo[i + 1];
|
|
int count = (int)(high - low);
|
|
for (int j = 0; j < count; ++j)
|
|
symbol_table[low + j] = (byte)i;
|
|
}
|
|
low = 0;
|
|
high = 0xFFFFFFFF;
|
|
uint current = BigEndian.ToUInt32 (input, src);
|
|
src += 4;
|
|
for (int i = 0; i < remaining; ++i)
|
|
{
|
|
uint range = high / denominator;
|
|
byte symbol = symbol_table[(current - low) / range];
|
|
data[index+i] = symbol;
|
|
low += ranges_lo[symbol] * range;
|
|
high = ranges_hi[symbol] * range;
|
|
while (0 == ((low ^ (high + low)) & 0xFF000000u))
|
|
{
|
|
low <<= 8;
|
|
high <<= 8;
|
|
current <<= 8;
|
|
current |= input[src++];
|
|
}
|
|
while (high < 0x10000)
|
|
{
|
|
low <<= 8;
|
|
high = 0x1000000 - (low & 0xFFFF00);
|
|
current <<= 8;
|
|
current |= input[src++];
|
|
}
|
|
}
|
|
}
|
|
data[index + 0x200] ^= (byte)length;
|
|
data[index + 0x201] ^= (byte)(length >> 8);
|
|
data[index + 0x202] ^= (byte)(length >> 16);
|
|
data[index + 0x203] ^= (byte)(length >> 24);
|
|
}
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x400)
|
|
return;
|
|
if ((flags & 0x104) == 0x104)
|
|
{
|
|
throw new NotImplementedException();
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class KeyAdlerCrypt : KeyDecryptBase
|
|
{
|
|
public KeyAdlerCrypt (uint key) : base (key, null)
|
|
{
|
|
}
|
|
|
|
protected override void DecryptPre (byte[] data, int index, uint length)
|
|
{
|
|
uint key = Adler32.Compute (data, index, 0x100);
|
|
data[index + 0x204] ^= (byte)key;
|
|
data[index + 0x205] ^= (byte)(key >> 8);
|
|
data[index + 0x206] ^= (byte)(key >> 16);
|
|
data[index + 0x207] ^= (byte)(key >> 24);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class AdlerCrypt : IDecryptExtra
|
|
{
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length >= 0x400 && (flags & 0x204) == 0x204)
|
|
Transform (data, index, 0xFF);
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length >= 0x400 && (flags & 0x104) == 0x104)
|
|
Transform (data, index, 0xFF);
|
|
}
|
|
|
|
void Transform (byte[] data, int index, int length)
|
|
{
|
|
uint key = Adler32.Compute (data, index, length);
|
|
data[index + 0x200] ^= (byte)key;
|
|
data[index + 0x201] ^= (byte)(key >> 8);
|
|
data[index + 0x202] ^= (byte)(key >> 16);
|
|
data[index + 0x203] ^= (byte)(key >> 24);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class BinboCrypt : IDecryptExtra
|
|
{
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x200)
|
|
return;
|
|
if ((flags & 0x204) == 0x204)
|
|
{
|
|
if (0x718E958D == LittleEndian.ToUInt32 (data, index))
|
|
{
|
|
var input = new byte[0x200];
|
|
Buffer.BlockCopy (data, index, input, 0, 0x200);
|
|
var reader = new LzComp (input, 8);
|
|
reader.Unpack (data, index);
|
|
}
|
|
if (length > 0x200)
|
|
data[index + 0x200] ^= (byte)length;
|
|
if (length > 0x201)
|
|
data[index + 0x201] ^= (byte)(length >> 8);
|
|
if (length > 0x202)
|
|
data[index + 0x202] ^= (byte)(length >> 16);
|
|
if (length > 0x203)
|
|
data[index + 0x203] ^= (byte)(length >> 24);
|
|
}
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length < 0x200)
|
|
return;
|
|
if ((flags & 0x104) == 0x104)
|
|
{
|
|
throw new NotImplementedException();
|
|
}
|
|
}
|
|
|
|
sealed class LzComp
|
|
{
|
|
byte[] m_input;
|
|
int m_src;
|
|
|
|
uint m_bits;
|
|
int m_bits_count;
|
|
|
|
public LzComp (byte[] input, int index)
|
|
{
|
|
m_input = input;
|
|
m_src = index;
|
|
}
|
|
|
|
public void Unpack (byte[] output, int dst)
|
|
{
|
|
FillBitCache();
|
|
while (m_src < m_input.Length)
|
|
{
|
|
if (GetBit() != 0)
|
|
{
|
|
output[dst++] = m_input[m_src++];
|
|
continue;
|
|
}
|
|
int count, offset;
|
|
if (GetBit() != 0)
|
|
{
|
|
count = LittleEndian.ToUInt16 (m_input, m_src);
|
|
m_src += 2;
|
|
offset = count >> 3 | -0x2000;
|
|
count &= 7;
|
|
if (count > 0)
|
|
{
|
|
count += 2;
|
|
}
|
|
else
|
|
{
|
|
count = m_input[m_src++];
|
|
if (0 == count)
|
|
break;
|
|
count += 9;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
count = GetBit() << 1;
|
|
count |= GetBit();
|
|
count += 2;
|
|
offset = m_input[m_src++] | -0x100;
|
|
}
|
|
Binary.CopyOverlapped (output, dst+offset, dst, count);
|
|
dst += count;
|
|
}
|
|
}
|
|
|
|
int GetBit ()
|
|
{
|
|
uint v = m_bits >> --m_bits_count;
|
|
if (m_bits_count <= 0)
|
|
{
|
|
FillBitCache();
|
|
}
|
|
return (int)(v & 1);
|
|
}
|
|
|
|
void FillBitCache ()
|
|
{
|
|
m_bits = LittleEndian.ToUInt32 (m_input, m_src);
|
|
m_src += 4;
|
|
m_bits_count = 32;
|
|
}
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class CountCrypt : IDecryptExtra
|
|
{
|
|
public void Decrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length >= 0x200 && (flags & 0x204) == 0x204)
|
|
DoCountCrypt (data, index, (int)length);
|
|
}
|
|
|
|
public void Encrypt (byte[] data, int index, uint length, uint flags)
|
|
{
|
|
if (length >= 0x200 && (flags & 0x104) == 0x104)
|
|
DoCountCrypt (data, index, (int)length);
|
|
}
|
|
|
|
void DoCountCrypt (byte[] data, int index, int length)
|
|
{
|
|
length = (length & 0x7E) | 1;
|
|
byte count_00 = 0, count_FF = 0;
|
|
for (int i = 0; i < length; ++i)
|
|
{
|
|
if (0xFF == data[index+i])
|
|
count_FF++;
|
|
else if (0 == data[index+i])
|
|
count_00++;
|
|
}
|
|
data[index + 0x100] ^= count_00;
|
|
data[index + 0x104] ^= count_FF;
|
|
}
|
|
}
|
|
}
|