public static byte[] Decrypt(string path)
{
int[] filedata = null;
using (var stream = File.Open(path, FileMode.Open))
{
filedata = new int[stream.Length / 4];
using (var reader = new BinaryReader(stream))
{
int size = (int)stream.Length;
int words = size >> 2;
int xorval = 0;
stream.Seek(0x1C, SeekOrigin.Begin);
int SEED = reader.ReadInt32().Reverse();
_rand = new RandomXS(SEED);
stream.Seek(0, SeekOrigin.Begin);
if (size % 8 == 0)
{
goto Dword_loop;
}
else if (size == 0)
{
return(null);
}
else if (size / 8 <= 0)
{
goto BYTE_loop;
}
#pragma warning disable CS0642 // Возможно, ошибочный пустой оператор
else
{
; //goto default_loop
}
#pragma warning restore CS0642 // Возможно, ошибочный пустой оператор
#region DWORD Loop
Dword_loop:
if (words == 0)
{
goto loops_end;
}
else if (words / 8 <= 0)
{
goto Word_Loop;
}
else
{
for (int i = 0; i < words >> 3; i++)
{
for (int x = 0; x < 8; x++)
{
var randInt = _rand.GetInt();
var XOR = reader.ReadInt32().Reverse() ^ randInt;
var val = XOR ^ xorval;
xorval = (randInt << 13) & unchecked ((int)0x80000000);
filedata[x + (i * 8)] = val.Reverse();
}
}
}
#endregion
#region Word Loop
Word_Loop:
if ((words & 7) <= 0)
{
goto loops_end;
}
int offset = (size >> 2 >> 3 << 3 << 2);
stream.Seek(offset, SeekOrigin.Begin);
for (int i = 0; i < (words & 7); i++)
{
var randInt = _rand.GetInt();
var XOR = reader.ReadInt32().Reverse() ^ randInt;
var val = XOR ^ xorval;
xorval = (randInt << 13) & unchecked ((int)0x80000000);
filedata[offset / 4 + i] = val.Reverse();
}
goto loops_end;
#endregion
#region BYTE Loop
BYTE_loop:
if ((size & 7) == 0)
{
goto func_end;
}
stream.Seek(4, SeekOrigin.Begin);
for (int i = 4; i < (size & 7); i++)
{
byte[] data = BitConverter.GetBytes(filedata[i.RoundDown(4)]);
var b = reader.ReadByte();
var shifted = (b >> 3) | (b << 32 - 3);
var val = b ^ shifted;
data[i] = (byte)val;
}
#endregion
loops_end:
filedata[7] = SEED.Reverse();
}
}
func_end:
byte[] result = new byte[filedata.Length * sizeof(int)];
Buffer.BlockCopy(filedata, 0, result, 0, result.Length);
return(result);
}
private byte[] Decrypt(FileData d)
{
int[] filedata = null;
filedata = new int[d.size() / 4];
int size = (int)d.size();
int words = size >> 2;
int xorval = 0;
d.seek(0x1C);
d.Endian = Endianness.Big;
int SEED = d.readInt();
RandomXS _rand = new RandomXS(SEED);
d.Endian = Endianness.Big;
d.seek(0);
if (size % 8 == 0)
{
goto Dword_loop;
}
else if (size == 0)
{
return(null);
}
else if (size / 8 <= 0)
{
goto BYTE_loop;
}
else
{
;//goto default_loop
}
#region DWORD Loop
Dword_loop:
if (words == 0)
{
goto loops_end;
}
else if (words / 8 <= 0)
{
goto Word_Loop;
}
else
{
for (int i = 0; i < (words >> 3); i++)
{
for (int x = 0; x < 8; x++)
{
var randInt = _rand.GetInt();
var XOR = d.readInt() ^ randInt;
var val = XOR ^ xorval;
xorval = (randInt << 13) & unchecked ((int)0x80000000);
filedata[x + (i * 8)] = val.Reverse();
}
}
}
#endregion
#region Word Loop
Word_Loop:
if ((words & 7) <= 0)
{
goto loops_end;
}
int offset = (size >> 2 >> 3 << 3 << 2);
d.seek(offset);
for (int i = 0; i < (words & 7); i++)
{
var randInt = _rand.GetInt();
var XOR = d.readInt() ^ randInt;
var val = XOR ^ xorval;
xorval = (randInt << 13) & unchecked ((int)0x80000000);
filedata[offset / 4 + i] = val.Reverse();
}
goto loops_end;
#endregion
#region BYTE Loop
BYTE_loop:
if ((size & 7) == 0)
{
goto func_end;
}
d.seek(4);
for (int i = 4; i < (size & 7); i++)
{
byte[] data = BitConverter.GetBytes(filedata[i.RoundDown(4)]);
var b = d.readByte();
var shifted = (b >> 3) | (b << 32 - 3);
var val = b ^ shifted;
data[i] = (byte)val;
}
#endregion
loops_end:
filedata[7] = SEED.Reverse();
func_end:
byte[] result = new byte[filedata.Length * sizeof(int)];
Buffer.BlockCopy(filedata, 0, result, 0, result.Length);
return(result);
}
