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R26_dev8 - First public commit
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dexyfex
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/*
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Copyright(c) 2015 Neodymium
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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//shamelessly stolen
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace CodeWalker.GameFiles
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{
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public class GTACrypto
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{
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public static byte[] DecryptAES(byte[] data)
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{
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return DecryptAESData(data, GTA5Keys.PC_AES_KEY);
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}
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public static byte[] DecryptAESData(byte[] data, byte[] key, int rounds = 1)
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{
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var rijndael = Rijndael.Create();
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rijndael.KeySize = 256;
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rijndael.Key = key;
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rijndael.BlockSize = 128;
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rijndael.Mode = CipherMode.ECB;
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rijndael.Padding = PaddingMode.None;
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var buffer = (byte[])data.Clone();
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var length = data.Length - data.Length % 16;
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// decrypt...
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if (length > 0)
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{
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var decryptor = rijndael.CreateDecryptor();
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for (var roundIndex = 0; roundIndex < rounds; roundIndex++)
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decryptor.TransformBlock(buffer, 0, length, buffer, 0);
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}
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return buffer;
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}
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public static byte[] EncryptAESData(byte[] data, byte[] key, int rounds = 1)
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{
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var rijndael = Rijndael.Create();
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rijndael.KeySize = 256;
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rijndael.Key = key;
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rijndael.BlockSize = 128;
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rijndael.Mode = CipherMode.ECB;
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rijndael.Padding = PaddingMode.None;
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var buffer = (byte[])data.Clone();
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var length = data.Length - data.Length % 16;
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// encrypt...
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if (length > 0)
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{
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var encryptor = rijndael.CreateEncryptor();
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for (var roundIndex = 0; roundIndex < rounds; roundIndex++)
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encryptor.TransformBlock(buffer, 0, length, buffer, 0);
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}
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return buffer;
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}
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public static byte[] GetNGKey(string name, uint length)
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{
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uint hash = GTA5Hash.CalculateHash(name);
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uint keyidx = (hash + length + (101 - 40)) % 0x65;
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return GTA5Keys.PC_NG_KEYS[keyidx];
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}
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public static byte[] DecryptNG(byte[] data, string name, uint length)
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{
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byte[] key = GetNGKey(name, length);
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return DecryptNG(data, key);
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}
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public static byte[] DecryptNG(byte[] data, byte[] key)
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{
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var decryptedData = new byte[data.Length];
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var keyuints = new uint[key.Length / 4];
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Buffer.BlockCopy(key, 0, keyuints, 0, key.Length);
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for (int blockIndex = 0; blockIndex < data.Length / 16; blockIndex++)
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{
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var encryptedBlock = new byte[16];
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Array.Copy(data, 16 * blockIndex, encryptedBlock, 0, 16);
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var decryptedBlock = DecryptNGBlock(encryptedBlock, keyuints);
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Array.Copy(decryptedBlock, 0, decryptedData, 16 * blockIndex, 16);
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}
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if (data.Length % 16 != 0)
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{
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var left = data.Length % 16;
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Buffer.BlockCopy(data, data.Length - left, decryptedData, data.Length - left, left);
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}
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return decryptedData;
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}
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public static byte[] DecryptNGBlock(byte[] data, uint[] key)
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{
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var buffer = data;
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// prepare key...
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var subKeys = new uint[17][];
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for (int i = 0; i < 17; i++)
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{
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subKeys[i] = new uint[4];
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subKeys[i][0] = key[4 * i + 0];
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subKeys[i][1] = key[4 * i + 1];
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subKeys[i][2] = key[4 * i + 2];
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subKeys[i][3] = key[4 * i + 3];
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}
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buffer = DecryptNGRoundA(buffer, subKeys[0], GTA5Keys.PC_NG_DECRYPT_TABLES[0]);
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buffer = DecryptNGRoundA(buffer, subKeys[1], GTA5Keys.PC_NG_DECRYPT_TABLES[1]);
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for (int k = 2; k <= 15; k++)
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buffer = DecryptNGRoundB(buffer, subKeys[k], GTA5Keys.PC_NG_DECRYPT_TABLES[k]);
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buffer = DecryptNGRoundA(buffer, subKeys[16], GTA5Keys.PC_NG_DECRYPT_TABLES[16]);
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return buffer;
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}
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// round 1,2,16
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public static byte[] DecryptNGRoundA(byte[] data, uint[] key, uint[][] table)
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{
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var x1 =
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table[0][data[0]] ^
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table[1][data[1]] ^
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table[2][data[2]] ^
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table[3][data[3]] ^
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key[0];
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var x2 =
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table[4][data[4]] ^
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table[5][data[5]] ^
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table[6][data[6]] ^
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table[7][data[7]] ^
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key[1];
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var x3 =
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table[8][data[8]] ^
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table[9][data[9]] ^
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table[10][data[10]] ^
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table[11][data[11]] ^
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key[2];
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var x4 =
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table[12][data[12]] ^
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table[13][data[13]] ^
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table[14][data[14]] ^
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table[15][data[15]] ^
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key[3];
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var result = new byte[16];
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Array.Copy(BitConverter.GetBytes(x1), 0, result, 0, 4);
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Array.Copy(BitConverter.GetBytes(x2), 0, result, 4, 4);
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Array.Copy(BitConverter.GetBytes(x3), 0, result, 8, 4);
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Array.Copy(BitConverter.GetBytes(x4), 0, result, 12, 4);
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return result;
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}
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// round 3-15
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public static byte[] DecryptNGRoundB(byte[] data, uint[] key, uint[][] table)
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{
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var x1 =
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table[0][data[0]] ^
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table[7][data[7]] ^
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table[10][data[10]] ^
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table[13][data[13]] ^
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key[0];
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var x2 =
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table[1][data[1]] ^
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table[4][data[4]] ^
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table[11][data[11]] ^
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table[14][data[14]] ^
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key[1];
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var x3 =
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table[2][data[2]] ^
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table[5][data[5]] ^
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table[8][data[8]] ^
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table[15][data[15]] ^
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key[2];
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var x4 =
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table[3][data[3]] ^
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table[6][data[6]] ^
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table[9][data[9]] ^
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table[12][data[12]] ^
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key[3];
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//var result = new byte[16];
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//Array.Copy(BitConverter.GetBytes(x1), 0, result, 0, 4);
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//Array.Copy(BitConverter.GetBytes(x2), 0, result, 4, 4);
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//Array.Copy(BitConverter.GetBytes(x3), 0, result, 8, 4);
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//Array.Copy(BitConverter.GetBytes(x4), 0, result, 12, 4);
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//return result;
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var result = new byte[16];
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result[0] = (byte)((x1 >> 0) & 0xFF);
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result[1] = (byte)((x1 >> 8) & 0xFF);
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result[2] = (byte)((x1 >> 16) & 0xFF);
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result[3] = (byte)((x1 >> 24) & 0xFF);
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result[4] = (byte)((x2 >> 0) & 0xFF);
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result[5] = (byte)((x2 >> 8) & 0xFF);
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result[6] = (byte)((x2 >> 16) & 0xFF);
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result[7] = (byte)((x2 >> 24) & 0xFF);
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result[8] = (byte)((x3 >> 0) & 0xFF);
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result[9] = (byte)((x3 >> 8) & 0xFF);
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result[10] = (byte)((x3 >> 16) & 0xFF);
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result[11] = (byte)((x3 >> 24) & 0xFF);
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result[12] = (byte)((x4 >> 0) & 0xFF);
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result[13] = (byte)((x4 >> 8) & 0xFF);
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result[14] = (byte)((x4 >> 16) & 0xFF);
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result[15] = (byte)((x4 >> 24) & 0xFF);
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return result;
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}
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}
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}
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