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Added support for encrypted .awc files

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This commit is contained in:
kolardavid 2018-01-09 18:28:21 +01:00
parent 6dcdaf4169
commit 8d977d4b26
2 changed files with 37 additions and 43 deletions
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74
GameFiles/FileTypes/AwcFile.cs
View File

@ -30,6 +30,28 @@ namespace CodeWalker.GameFiles
public uint[] AudioIds { get; set; }
public AwcAudio[] Audios { get; set; }
public void Decrypt_RSXXTEA(ref byte[] data, uint[] key)
{
// Rockstar's modified version of XXTEA
uint[] blocks = new uint[data.Length / 4];
Buffer.BlockCopy(data, 0, blocks, 0, data.Length);
int block_count = blocks.Length;
uint a, b = blocks[0], i;
i = (uint)(0x9E3779B9 * (6 + 52 / block_count));
do
{
for (int block_index = block_count - 1; block_index >= 0; --block_index)
{
a = blocks[(block_index > 0 ? block_index : block_count) - 1];
b = blocks[block_index] -= (a >> 5 ^ b << 2) + (b >> 3 ^ a << 4) ^ (i ^ b) + (key[block_index & 3 ^ (i >> 2 & 3)] ^ a ^ 0x7B3A207F);
}
i -= 0x9E3779B9;
} while (i != 0);
Buffer.BlockCopy(blocks, 0, data, 0, data.Length);
}
public void Load(byte[] data, RpfFileEntry entry)
{
@ -48,9 +70,19 @@ namespace CodeWalker.GameFiles
return; //nothing to do, not enough data...
}
Magic = BitConverter.ToUInt32(data, 0);
Endianess endianess = Endianess.LittleEndian;
Magic = BitConverter.ToUInt32(data, 0);
if (Magic != 0x54414441 && Magic != 0x41444154)
{
if (data.Length % 4 == 0)
{
Decrypt_RSXXTEA(ref data, GTA5Keys.PC_AWC_KEY);
Magic = BitConverter.ToUInt32(data, 0);
} else
ErrorMessage = "Corrupted data!";
}
switch (Magic)
{
default:
@ -64,44 +96,6 @@ namespace CodeWalker.GameFiles
break;
}
/* francium - Today at 6:11 PM
IDA decompiler code from a function that seems to be called around audio loading if not ADAT:
if ( a3 )
{
v3 = *a1;
v4 = -a2;
v5 = (unsigned int)(-a2 - 1);
v6 = 0x9E3779B9 * (52 / -a2 + 6);
do
{
LODWORD(v7) = -a2 - 1;
v8 = (v6 >> 2) & 3;
if ( -a2 != 1 )
{
v9 = (unsigned int)v5;
v10 = &a1[v5];
do
{
v7 = (unsigned int)(v7 - 1);
v11 = v9--;
*v10 -= ((v6 ^ v3) + (a1[v7] ^ *(_DWORD *)(a3 + 4 * (v8 ^ (unsigned __int64)(v11 & 3))) ^ 0x7B3A207F)) ^ ((4 * v3 ^ (a1[v7] >> 5)) + ((v3 >> 3) ^ 16 * a1[v7]));
v3 = *v10;
--v10;
}
while ( (_DWORD)v7 );
}
result = (v6 ^ v3) + (a1[v4 - 1] ^ *(_DWORD *)(a3 + 4 * (v8 ^ (unsigned __int64)(v7 & 3))) ^ 0x7B3A207F);
*a1 -= result ^ ((4 * v3 ^ (a1[v4 - 1] >> 5)) + ((v3 >> 3) ^ 16 * a1[v4 - 1]));
v3 = *a1;
v6 += 0x61C88647;
}
while ( v6 );
}
*/
using (MemoryStream ms = new MemoryStream(data))
{
DataReader r = new DataReader(ms, endianess);

6
GameFiles/Utils/GTAKeys.cs
View File

@ -64,7 +64,7 @@ namespace CodeWalker.GameFiles
public static byte[] PC_LUT; // 256
public static byte[] PC_AWC_KEY; // 16
public static uint[] PC_AWC_KEY; // 16
@ -302,12 +302,12 @@ namespace CodeWalker.GameFiles
byte[] b1 = new byte[27472];
byte[] b2 = new byte[278528];
byte[] b3 = new byte[256];
byte[] b4 = new byte[16];
uint[] b4 = new uint[4];
int bp = 0;
Buffer.BlockCopy(b, bp, b1, 0, b1.Length); bp += b1.Length; // 27472
Buffer.BlockCopy(b, bp, b2, 0, b2.Length); bp += b2.Length; // 278528
Buffer.BlockCopy(b, bp, b3, 0, b3.Length); bp += b3.Length; // 256
Buffer.BlockCopy(b, bp, b4, 0, b4.Length); bp += b4.Length; // 16
Buffer.BlockCopy(b, bp, b4, 0, b4.Length * 4); bp += b4.Length; // 16
PC_NG_KEYS = CryptoIO.ReadNgKeys(b1);
PC_NG_DECRYPT_TABLES = CryptoIO.ReadNgTables(b2);