mirror of
https://mirror.ghproxy.com/https://github.com/dexyfex/CodeWalker
synced 2024-11-23 07:22:52 +08:00
252 lines
8.5 KiB
C#
252 lines
8.5 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.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Security.Cryptography;
|
|
using System.Text;
|
|
using System.Threading.Tasks;
|
|
|
|
namespace CodeWalker.GameFiles
|
|
{
|
|
public class GTACrypto
|
|
{
|
|
|
|
|
|
public static byte[] DecryptAES(byte[] data)
|
|
{
|
|
return DecryptAESData(data, GTA5Keys.PC_AES_KEY);
|
|
}
|
|
|
|
public static byte[] DecryptAESData(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;
|
|
|
|
// decrypt...
|
|
if (length > 0)
|
|
{
|
|
var decryptor = rijndael.CreateDecryptor();
|
|
for (var roundIndex = 0; roundIndex < rounds; roundIndex++)
|
|
decryptor.TransformBlock(buffer, 0, length, buffer, 0);
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
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 byte[] 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 length)
|
|
{
|
|
byte[] key = GetNGKey(name, length);
|
|
return DecryptNG(data, key);
|
|
}
|
|
|
|
public static byte[] DecryptNG(byte[] data, byte[] key)
|
|
{
|
|
var decryptedData = new byte[data.Length];
|
|
|
|
var keyuints = new uint[key.Length / 4];
|
|
Buffer.BlockCopy(key, 0, keyuints, 0, key.Length);
|
|
|
|
for (int blockIndex = 0; blockIndex < data.Length / 16; blockIndex++)
|
|
{
|
|
var encryptedBlock = new byte[16];
|
|
Array.Copy(data, 16 * blockIndex, encryptedBlock, 0, 16);
|
|
var decryptedBlock = DecryptNGBlock(encryptedBlock, keyuints);
|
|
Array.Copy(decryptedBlock, 0, decryptedData, 16 * blockIndex, 16);
|
|
}
|
|
|
|
if (data.Length % 16 != 0)
|
|
{
|
|
var left = data.Length % 16;
|
|
Buffer.BlockCopy(data, data.Length - left, decryptedData, data.Length - left, left);
|
|
}
|
|
|
|
return decryptedData;
|
|
}
|
|
|
|
public static byte[] DecryptNGBlock(byte[] data, uint[] key)
|
|
{
|
|
var buffer = data;
|
|
|
|
// prepare key...
|
|
var subKeys = new uint[17][];
|
|
for (int i = 0; i < 17; i++)
|
|
{
|
|
subKeys[i] = new uint[4];
|
|
subKeys[i][0] = key[4 * i + 0];
|
|
subKeys[i][1] = key[4 * i + 1];
|
|
subKeys[i][2] = key[4 * i + 2];
|
|
subKeys[i][3] = key[4 * i + 3];
|
|
}
|
|
|
|
buffer = DecryptNGRoundA(buffer, subKeys[0], GTA5Keys.PC_NG_DECRYPT_TABLES[0]);
|
|
buffer = DecryptNGRoundA(buffer, subKeys[1], GTA5Keys.PC_NG_DECRYPT_TABLES[1]);
|
|
for (int k = 2; k <= 15; k++)
|
|
buffer = DecryptNGRoundB(buffer, subKeys[k], GTA5Keys.PC_NG_DECRYPT_TABLES[k]);
|
|
buffer = DecryptNGRoundA(buffer, subKeys[16], GTA5Keys.PC_NG_DECRYPT_TABLES[16]);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
|
|
// round 1,2,16
|
|
public static byte[] 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];
|
|
|
|
var result = new byte[16];
|
|
Array.Copy(BitConverter.GetBytes(x1), 0, result, 0, 4);
|
|
Array.Copy(BitConverter.GetBytes(x2), 0, result, 4, 4);
|
|
Array.Copy(BitConverter.GetBytes(x3), 0, result, 8, 4);
|
|
Array.Copy(BitConverter.GetBytes(x4), 0, result, 12, 4);
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
// round 3-15
|
|
public static byte[] 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];
|
|
|
|
//var result = new byte[16];
|
|
//Array.Copy(BitConverter.GetBytes(x1), 0, result, 0, 4);
|
|
//Array.Copy(BitConverter.GetBytes(x2), 0, result, 4, 4);
|
|
//Array.Copy(BitConverter.GetBytes(x3), 0, result, 8, 4);
|
|
//Array.Copy(BitConverter.GetBytes(x4), 0, result, 12, 4);
|
|
//return result;
|
|
|
|
var result = new byte[16];
|
|
result[0] = (byte)((x1 >> 0) & 0xFF);
|
|
result[1] = (byte)((x1 >> 8) & 0xFF);
|
|
result[2] = (byte)((x1 >> 16) & 0xFF);
|
|
result[3] = (byte)((x1 >> 24) & 0xFF);
|
|
result[4] = (byte)((x2 >> 0) & 0xFF);
|
|
result[5] = (byte)((x2 >> 8) & 0xFF);
|
|
result[6] = (byte)((x2 >> 16) & 0xFF);
|
|
result[7] = (byte)((x2 >> 24) & 0xFF);
|
|
result[8] = (byte)((x3 >> 0) & 0xFF);
|
|
result[9] = (byte)((x3 >> 8) & 0xFF);
|
|
result[10] = (byte)((x3 >> 16) & 0xFF);
|
|
result[11] = (byte)((x3 >> 24) & 0xFF);
|
|
result[12] = (byte)((x4 >> 0) & 0xFF);
|
|
result[13] = (byte)((x4 >> 8) & 0xFF);
|
|
result[14] = (byte)((x4 >> 16) & 0xFF);
|
|
result[15] = (byte)((x4 >> 24) & 0xFF);
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
}
|
|
}
|