mirror of
https://mirror.ghproxy.com/https://github.com/dexyfex/CodeWalker
synced 2024-11-17 04:22:54 +08:00
8c2e444049
Added Span support in some places already, and changed Nullable to annotations to declare intent to enable nullable at some point in the future
401 lines
16 KiB
C#
401 lines
16 KiB
C#
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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.Buffers;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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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, int length)
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{
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return DecryptAESData(data, GTA5Keys.PC_AES_KEY, length, 1);
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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[] EncryptAES(byte[] data)
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{
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return EncryptAESData(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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return DecryptAESData(data, key, data.Length, rounds);
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}
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public static byte[] DecryptAESData(byte[] data, byte[] key, int length, int rounds = 1)
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{
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using var aes = Aes.Create();
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aes.KeySize = 256;
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aes.Key = key;
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aes.BlockSize = 128;
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aes.Mode = CipherMode.ECB;
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aes.Padding = PaddingMode.None;
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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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length = length - length % 16;
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// decrypt...
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if (length > 0)
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{
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using var decryptorAes = aes.CreateDecryptor();
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for (var roundIndex = 0; roundIndex < rounds; roundIndex++)
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{
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decryptorAes.TransformBlock(data, 0, length, data, 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(data, 0, length, data, 0);
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}
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return data;
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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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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static uint[][] 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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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void DecryptNG(byte[] data, string name, uint fileSize, int offset = 0, int? length = null)
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{
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var key = GetNGKey(name, fileSize);
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length ??= data.Length;
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DecryptNG(data.AsSpan(offset, length.Value), key);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void DecryptNG(Span<byte> data, string name, uint fileSize)
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{
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var key = GetNGKey(name, fileSize);
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DecryptNG(data, key);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public unsafe static void DecryptNG(byte[] data, uint[][] key, int offset = 0, int? length = null)
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{
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length ??= data.Length;
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DecryptNG(data.AsSpan(offset, length.Value), key);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void DecryptNG(Span<byte> data, uint[][] key)
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{
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for (int blockIndex = 0; blockIndex < data.Length / 16; blockIndex++)
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{
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DecryptNGBlock(data.Slice(16 * blockIndex, 16), key);
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void DecryptNGBlock(Span<byte> data, uint[][] key)
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{
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DecryptNGRoundA(data, key[0], GTA5Keys.PC_NG_DECRYPT_TABLES[0]);
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DecryptNGRoundA(data, key[1], GTA5Keys.PC_NG_DECRYPT_TABLES[1]);
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for (int k = 2; k <= 15; k++)
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DecryptNGRoundB(data, key[k], GTA5Keys.PC_NG_DECRYPT_TABLES[k]);
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DecryptNGRoundA(data, key[16], GTA5Keys.PC_NG_DECRYPT_TABLES[16]);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void DecryptNGRoundA(Span<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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MemoryMarshal.Write(data.Slice(0, 4), ref x1);
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MemoryMarshal.Write(data.Slice(4, 4), ref x2);
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MemoryMarshal.Write(data.Slice(8, 4), ref x3);
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MemoryMarshal.Write(data.Slice(12, 4), ref x4);
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}
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// round 3-15
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public unsafe static void DecryptNGRoundB(Span<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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MemoryMarshal.Write(data.Slice(0, 4), ref x1);
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MemoryMarshal.Write(data.Slice(4, 4), ref x2);
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MemoryMarshal.Write(data.Slice(8, 4), ref x3);
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MemoryMarshal.Write(data.Slice(12, 4), ref x4);
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}
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public static byte[] EncryptNG(byte[] data, string name, uint length)
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{
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var key = GetNGKey(name, length);
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return EncryptNG(data, key);
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}
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public static byte[] EncryptNG(byte[] data, uint[][] key)
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{
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if ((GTA5Keys.PC_NG_ENCRYPT_TABLES == null) || (GTA5Keys.PC_NG_ENCRYPT_LUTs == null))
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{
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throw new Exception("Unable to encrypt - tables not loaded.");
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}
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var encryptedData = new byte[data.Length];
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for (int blockIndex = 0; blockIndex < data.Length / 16; blockIndex++)
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{
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byte[] decryptedBlock = new byte[16];
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Array.Copy(data, 16 * blockIndex, decryptedBlock, 0, 16);
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byte[] encryptedBlock = EncryptBlock(decryptedBlock, key);
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Array.Copy(encryptedBlock, 0, encryptedData, 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, encryptedData, data.Length - left, left);
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}
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return encryptedData;
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}
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public static byte[] EncryptBlock(byte[] data, uint[][] key)
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{
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var buffer = data;
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buffer = EncryptRoundA(buffer, key[16], GTA5Keys.PC_NG_ENCRYPT_TABLES[16]);
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for (int k = 15; k >= 2; k--)
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buffer = EncryptRoundB_LUT(buffer, key[k], GTA5Keys.PC_NG_ENCRYPT_LUTs[k]);
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buffer = EncryptRoundA(buffer, key[1], GTA5Keys.PC_NG_ENCRYPT_TABLES[1]);
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buffer = EncryptRoundA(buffer, key[0], GTA5Keys.PC_NG_ENCRYPT_TABLES[0]);
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return buffer;
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}
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public static byte[] EncryptRoundA(byte[] data, uint[] key, uint[][] table)
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{
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// apply xor to data first...
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var xorbuf = new byte[16];
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Buffer.BlockCopy(key, 0, xorbuf, 0, 16);
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var x1 =
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table[0][data[0] ^ xorbuf[0]] ^
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table[1][data[1] ^ xorbuf[1]] ^
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table[2][data[2] ^ xorbuf[2]] ^
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table[3][data[3] ^ xorbuf[3]];
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var x2 =
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table[4][data[4] ^ xorbuf[4]] ^
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table[5][data[5] ^ xorbuf[5]] ^
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table[6][data[6] ^ xorbuf[6]] ^
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table[7][data[7] ^ xorbuf[7]];
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var x3 =
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table[8][data[8] ^ xorbuf[8]] ^
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table[9][data[9] ^ xorbuf[9]] ^
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table[10][data[10] ^ xorbuf[10]] ^
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table[11][data[11] ^ xorbuf[11]];
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var x4 =
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table[12][data[12] ^ xorbuf[12]] ^
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table[13][data[13] ^ xorbuf[13]] ^
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table[14][data[14] ^ xorbuf[14]] ^
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table[15][data[15] ^ xorbuf[15]];
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var buf = new byte[16];
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Array.Copy(BitConverter.GetBytes(x1), 0, buf, 0, 4);
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Array.Copy(BitConverter.GetBytes(x2), 0, buf, 4, 4);
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Array.Copy(BitConverter.GetBytes(x3), 0, buf, 8, 4);
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Array.Copy(BitConverter.GetBytes(x4), 0, buf, 12, 4);
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return buf;
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}
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public static byte[] EncryptRoundA_LUT(byte[] dataOld, uint[] key, GTA5NGLUT[] lut)
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{
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var data = (byte[])dataOld.Clone();
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// apply xor to data first...
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var xorbuf = new byte[16];
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Buffer.BlockCopy(key, 0, xorbuf, 0, 16);
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for (int y = 0; y < 16; y++)
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{
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data[y] ^= xorbuf[y];
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}
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return new byte[] {
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lut[0].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[1].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[2].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[3].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[4].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[5].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[6].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[7].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[8].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
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lut[9].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
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lut[10].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
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lut[11].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
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lut[12].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
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lut[13].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
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lut[14].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
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lut[15].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0))
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};
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}
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public static byte[] EncryptRoundB_LUT(byte[] dataOld, uint[] key, GTA5NGLUT[] lut)
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{
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var data = (byte[])dataOld.Clone();
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// apply xor to data first...
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var xorbuf = new byte[16];
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Buffer.BlockCopy(key, 0, xorbuf, 0, 16);
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for (int y = 0; y < 16; y++)
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{
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data[y] ^= xorbuf[y];
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}
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return new byte[] {
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lut[0].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[1].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[2].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
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lut[3].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
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lut[4].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[5].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
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lut[6].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
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lut[7].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[8].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0)),
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lut[9].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
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lut[10].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[11].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[12].LookUp(BitConverter.ToUInt32( new byte[] { data[12], data[13], data[14], data[15] }, 0)),
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lut[13].LookUp(BitConverter.ToUInt32( new byte[] { data[0], data[1], data[2], data[3] }, 0)),
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lut[14].LookUp(BitConverter.ToUInt32( new byte[] { data[4], data[5], data[6], data[7] }, 0)),
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lut[15].LookUp(BitConverter.ToUInt32( new byte[] { data[8], data[9], data[10], data[11] }, 0))};
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}
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}
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}
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