CodeWalker/CodeWalker.Core/GameFiles/Utils/GTACrypto.cs
2023-10-27 21:31:09 +02:00

531 lines
19 KiB
C#

/*
Copyright(c) 2015 Neodymium
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.
*/
//shamelessly stolen
using System;
using System.Buffers;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace CodeWalker.GameFiles
{
public class GTACrypto
{
public static byte[] DecryptAES(byte[] data, int length)
{
return DecryptAESData(data, GTA5Keys.PC_AES_KEY, length, 1);
}
public static byte[] DecryptAES(byte[] data)
{
return DecryptAESData(data, GTA5Keys.PC_AES_KEY);
}
public static byte[] EncryptAES(byte[] data)
{
return EncryptAESData(data, GTA5Keys.PC_AES_KEY);
}
public static byte[] DecryptAESData(byte[] data, byte[] key, int rounds = 1)
{
return DecryptAESData(data, key, data.Length, rounds);
}
public static byte[] DecryptAESData(byte[] data, byte[] key, int length, int rounds = 1)
{
var rijndael = Rijndael.Create();
rijndael.KeySize = 256;
rijndael.Key = key;
rijndael.BlockSize = 128;
rijndael.Mode = CipherMode.ECB;
rijndael.Padding = PaddingMode.None;
length = length - length % 16;
// decrypt...
if (length > 0)
{
var decryptor = rijndael.CreateDecryptor();
for (var roundIndex = 0; roundIndex < rounds; roundIndex++)
decryptor.TransformBlock(data, 0, length, data, 0);
}
return data;
}
public static byte[] EncryptAESData(byte[] data, byte[] key, int rounds = 1)
{
var rijndael = Rijndael.Create();
rijndael.KeySize = 256;
rijndael.Key = key;
rijndael.BlockSize = 128;
rijndael.Mode = CipherMode.ECB;
rijndael.Padding = PaddingMode.None;
var buffer = (byte[])data.Clone();
var length = data.Length - data.Length % 16;
// encrypt...
if (length > 0)
{
var encryptor = rijndael.CreateEncryptor();
for (var roundIndex = 0; roundIndex < rounds; roundIndex++)
encryptor.TransformBlock(buffer, 0, length, buffer, 0);
}
return buffer;
}
public static uint[][] GetNGKey(string name, uint length)
{
uint hash = GTA5Hash.CalculateHash(name);
uint keyidx = (hash + length + (101 - 40)) % 0x65;
return GTA5Keys.PC_NG_KEYS[keyidx];
}
public static byte[] DecryptNG(byte[] data, string name, uint fileSize, int offset = 0, int? length = null)
{
var key = GetNGKey(name, fileSize);
return DecryptNG(data, key, offset, length);
}
public unsafe static byte[] DecryptNG(byte[] data, uint[][] key, int offset = 0, int? length = null)
{
length ??= data.Length;
fixed (byte* bptr = data)
{
for (int blockIndex = offset * 16; blockIndex < length / 16; blockIndex++)
{
DecryptNGBlock(bptr + 16 * blockIndex, key);
}
}
return data;
}
public unsafe static void DecryptNGBlock(byte[] data, uint[][] key)
{
fixed(byte* bptr = data)
{
DecryptNGBlock(data, key);
}
}
public unsafe static void DecryptNGBlock(byte* data, uint[][] key)
{
DecryptNGRoundA(data, key[0], GTA5Keys.PC_NG_DECRYPT_TABLES[0]);
DecryptNGRoundA(data, key[1], GTA5Keys.PC_NG_DECRYPT_TABLES[1]);
for (int k = 2; k <= 15; k++)
DecryptNGRoundB(data, key[k], GTA5Keys.PC_NG_DECRYPT_TABLES[k]);
DecryptNGRoundA(data, key[16], GTA5Keys.PC_NG_DECRYPT_TABLES[16]);
}
public unsafe static void DecryptNGRoundA(byte[] data, uint[] key, uint[][] table)
{
fixed(byte* bptr = data)
{
DecryptNGRoundA(bptr, key, table);
}
}
public unsafe static void DecryptNGRoundB(byte[] data, uint[] key, uint[][] table)
{
fixed (byte* bptr = data)
{
DecryptNGRoundB(bptr, key, table);
}
}
// round 1,2,16
public unsafe static void DecryptNGRoundA(byte* data, uint[] key, uint[][] table)
{
var x1 =
table[0][data[0]] ^
table[1][data[1]] ^
table[2][data[2]] ^
table[3][data[3]] ^
key[0];
var x2 =
table[4][data[4]] ^
table[5][data[5]] ^
table[6][data[6]] ^
table[7][data[7]] ^
key[1];
var x3 =
table[8][data[8]] ^
table[9][data[9]] ^
table[10][data[10]] ^
table[11][data[11]] ^
key[2];
var x4 =
table[12][data[12]] ^
table[13][data[13]] ^
table[14][data[14]] ^
table[15][data[15]] ^
key[3];
*(uint*)data = x1;
*(uint*)(data + 4) = x2;
*(uint*)(data + 8) = x3;
*(uint*)(data + 12) = x4;
}
// round 3-15
public unsafe static void DecryptNGRoundB(byte* data, uint[] key, uint[][] table)
{
var x1 =
table[0][data[0]] ^
table[7][data[7]] ^
table[10][data[10]] ^
table[13][data[13]] ^
key[0];
var x2 =
table[1][data[1]] ^
table[4][data[4]] ^
table[11][data[11]] ^
table[14][data[14]] ^
key[1];
var x3 =
table[2][data[2]] ^
table[5][data[5]] ^
table[8][data[8]] ^
table[15][data[15]] ^
key[2];
var x4 =
table[3][data[3]] ^
table[6][data[6]] ^
table[9][data[9]] ^
table[12][data[12]] ^
key[3];
*(uint*)data = x1;
*(uint*)(data + 4) = x2;
*(uint*)(data + 8) = x3;
*(uint*)(data + 12) = x4;
}
public static byte[] EncryptNG(byte[] data, string name, uint length)
{
var key = GetNGKey(name, length);
return EncryptNG(data, key);
}
public static byte[] EncryptNG(byte[] data, uint[][] key)
{
if ((GTA5Keys.PC_NG_ENCRYPT_TABLES == null) || (GTA5Keys.PC_NG_ENCRYPT_LUTs == null))
{
throw new Exception("Unable to encrypt - tables not loaded.");
}
var encryptedData = new byte[data.Length];
for (int blockIndex = 0; blockIndex < data.Length / 16; blockIndex++)
{
byte[] decryptedBlock = new byte[16];
Array.Copy(data, 16 * blockIndex, decryptedBlock, 0, 16);
byte[] encryptedBlock = EncryptBlock(decryptedBlock, key);
Array.Copy(encryptedBlock, 0, encryptedData, 16 * blockIndex, 16);
}
if (data.Length % 16 != 0)
{
var left = data.Length % 16;
Buffer.BlockCopy(data, data.Length - left, encryptedData, data.Length - left, left);
}
return encryptedData;
}
public static byte[] EncryptBlock(byte[] data, uint[][] key)
{
var buffer = data;
buffer = EncryptRoundA(buffer, key[16], GTA5Keys.PC_NG_ENCRYPT_TABLES[16]);
for (int k = 15; k >= 2; k--)
buffer = EncryptRoundB_LUT(buffer, key[k], GTA5Keys.PC_NG_ENCRYPT_LUTs[k]);
buffer = EncryptRoundA(buffer, key[1], GTA5Keys.PC_NG_ENCRYPT_TABLES[1]);
buffer = EncryptRoundA(buffer, key[0], GTA5Keys.PC_NG_ENCRYPT_TABLES[0]);
return buffer;
}
public static byte[] EncryptRoundA(byte[] data, uint[] key, uint[][] table)
{
// apply xor to data first...
var xorbuf = new byte[16];
Buffer.BlockCopy(key, 0, xorbuf, 0, 16);
var x1 =
table[0][data[0] ^ xorbuf[0]] ^
table[1][data[1] ^ xorbuf[1]] ^
table[2][data[2] ^ xorbuf[2]] ^
table[3][data[3] ^ xorbuf[3]];
var x2 =
table[4][data[4] ^ xorbuf[4]] ^
table[5][data[5] ^ xorbuf[5]] ^
table[6][data[6] ^ xorbuf[6]] ^
table[7][data[7] ^ xorbuf[7]];
var x3 =
table[8][data[8] ^ xorbuf[8]] ^
table[9][data[9] ^ xorbuf[9]] ^
table[10][data[10] ^ xorbuf[10]] ^
table[11][data[11] ^ xorbuf[11]];
var x4 =
table[12][data[12] ^ xorbuf[12]] ^
table[13][data[13] ^ xorbuf[13]] ^
table[14][data[14] ^ xorbuf[14]] ^
table[15][data[15] ^ xorbuf[15]];
var buf = new byte[16];
Array.Copy(BitConverter.GetBytes(x1), 0, buf, 0, 4);
Array.Copy(BitConverter.GetBytes(x2), 0, buf, 4, 4);
Array.Copy(BitConverter.GetBytes(x3), 0, buf, 8, 4);
Array.Copy(BitConverter.GetBytes(x4), 0, buf, 12, 4);
return buf;
}
public static byte[] EncryptRoundA_LUT(byte[] dataOld, uint[] key, GTA5NGLUT[] lut)
{
var data = (byte[])dataOld.Clone();
// apply xor to data first...
var xorbuf = new byte[16];
Buffer.BlockCopy(key, 0, xorbuf, 0, 16);
for (int y = 0; y < 16; y++)
{
data[y] ^= xorbuf[y];
}
return new byte[] {
lut[0].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[1].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[2].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[3].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[4].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[5].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[6].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[7].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[8].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
lut[9].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
lut[10].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
lut[11].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
lut[12].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
lut[13].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
lut[14].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
lut[15].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0))
};
}
public static byte[] EncryptRoundB_LUT(byte[] dataOld, uint[] key, GTA5NGLUT[] lut)
{
var data = (byte[])dataOld.Clone();
// apply xor to data first...
var xorbuf = new byte[16];
Buffer.BlockCopy(key, 0, xorbuf, 0, 16);
for (int y = 0; y < 16; y++)
{
data[y] ^= xorbuf[y];
}
return new byte[] {
lut[0].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[1].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[2].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
lut[3].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
lut[4].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[5].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
lut[6].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
lut[7].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[8].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
lut[9].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
lut[10].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[11].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[12].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
lut[13].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
lut[14].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
lut[15].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0))};
}
}
public class DecryptNGStream : Stream
{
public string Name { get; set; }
private long _length = 0;
private Stream _baseStream;
public Stream BaseStream { get => _baseStream; private set => _baseStream = value; }
public uint[][] Key { get; set; }
private long offset = 0;
public override long Length
{
get
{
if (_length != 0) return _length;
return _baseStream.Length - offset;
}
}
private DecryptNGStream(string name, uint length)
{
_length = length;
Name = name;
Key = GTACrypto.GetNGKey(name, length);
}
public DecryptNGStream(byte[] data, string name, uint fileSize) : this(name, fileSize)
{
BaseStream = new MemoryStream(data);
}
public DecryptNGStream(Stream data, string name, uint fileSize) : this(name, fileSize)
{
BaseStream = data;
}
public DecryptNGStream(Stream data, string name, uint fileSize, int start, int length = 0): this(data, name, fileSize)
{
this.offset = start;
this._length = length;
}
public override bool CanRead => _baseStream.CanRead;
public override bool CanSeek => _baseStream.CanSeek;
public override bool CanWrite => _baseStream.CanWrite;
public override long Position
{
get
{
var position = _baseStream.Position - offset;
position = position - position % 16;
return position + positionInBuffer;
}
set
{
positionInBuffer = 0;
_baseStream.Position = (value + offset);
ReadBlock();
}
}
public override void Flush()
{
return;
}
public void ReadBlock()
{
_baseStream.Read(_buffer, 0, _buffer.Length);
}
private byte[] _buffer = new byte[16];
private byte positionInBuffer = 0;
public override int Read(byte[] buffer, int offset, int count)
{
if (positionInBuffer > 0)
{
var toCopy = (byte)Math.Min(16 - positionInBuffer, count);
Array.Copy(_buffer, positionInBuffer, buffer, offset, toCopy);
positionInBuffer += toCopy;
if (positionInBuffer >= 16)
{
positionInBuffer = 0;
}
offset += toCopy;
count -= toCopy;
}
var i = 0;
while (count >= 16)
{
_baseStream.Read(buffer, offset + i, 16);
i += 16;
}
if (count > 0)
{
_baseStream.Read(_buffer, 0, 16);
GTACrypto.DecryptNG(_buffer, Key, 0, 16);
Array.Copy(_buffer, positionInBuffer, buffer, offset + i, count - i);
positionInBuffer += (byte)(count - i);
}
var data = _baseStream.Read(buffer, offset, count);
GTACrypto.DecryptNG(buffer, Key, offset, count);
return data;
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotImplementedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotImplementedException();
}
}
}