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Support AWC encryption

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This commit is contained in:
dexy 2024-07-26 12:52:19 +10:00
parent 10ea57e86d
commit d5ac5e8e59
1 changed files with 97 additions and 7 deletions
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104
CodeWalker.Core/GameFiles/FileTypes/AwcFile.cs
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@ -40,9 +40,10 @@ namespace CodeWalker.GameFiles
public Dictionary<uint, AwcStream> StreamDict { get; set; }
static public void Decrypt_RSXXTEA(byte[] data, uint[] key)
public static void Decrypt_RSXXTEA(byte[] data)
{
// Rockstar's modified version of XXTEA
var key = GTA5Keys.PC_AWC_KEY;
uint[] blocks = new uint[data.Length / 4];
Buffer.BlockCopy(data, 0, blocks, 0, data.Length);
@ -63,6 +64,39 @@ namespace CodeWalker.GameFiles
Buffer.BlockCopy(blocks, 0, data, 0, data.Length);
}
public static void Encrypt_RSXXTEA(byte[] data)
{
//https://en.wikipedia.org/wiki/XXTEA#Reference_code
//original is
//#define MX ((z>>5^y<<2) + (y>>3^z<<4) ^ (sum^y) + (k[p&3^e]^z))
//R * is
//#define MX ((z>>5^y<<2) + (y>>3^z<<4) ^ (sum^y) + (k[p&3^e]^z ^ 0x7B3A207F))
//(thanks alex)
//TODO: update the Decrypt method to use the "clarified" version without undefined behaviour?
var key = GTA5Keys.PC_AWC_KEY;
uint[] blocks = new uint[data.Length / 4];
Buffer.BlockCopy(data, 0, blocks, 0, data.Length);
int n = blocks.Length;
int rounds = 6 + (52 / n);
uint sum = 0;
uint y, z = blocks[n - 1];
do
{
sum += 0x9E3779B9;
uint e = (sum >> 2) & 3;
for (int p = 0; p < n; p++)
{
y = blocks[(p + 1) % n];
z = blocks[p] += (z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (sum ^ y) + (key[p & 3 ^ e] ^ z ^ 0x7B3A207F);
}
} while ((--rounds) != 0);
Buffer.BlockCopy(blocks, 0, data, 0, data.Length);
}
public void Load(byte[] data, RpfFileEntry entry)
{
Name = entry.Name;
@ -89,7 +123,7 @@ namespace CodeWalker.GameFiles
{
if (data.Length % 4 == 0)
{
Decrypt_RSXXTEA(data, GTA5Keys.PC_AWC_KEY);
Decrypt_RSXXTEA(data);
Magic = BitConverter.ToUInt32(data, 0);
WholeFileEncrypted = true;
}
@ -127,10 +161,24 @@ namespace CodeWalker.GameFiles
Write(w);
var buf = new byte[s.Length];
var data = new byte[s.Length];
s.Position = 0;
s.Read(buf, 0, buf.Length);
return buf;
s.Read(data, 0, data.Length);
if (WholeFileEncrypted)
{
if (data.Length % 4 != 0)
{
var pad = 4 - (data.Length % 4);
var len = data.Length + pad;
var newdata = new byte[len];
Buffer.BlockCopy(data, 0, newdata, 0, data.Length);
data = newdata;
}
Encrypt_RSXXTEA(data);
}
return data;
}
@ -270,6 +318,33 @@ namespace CodeWalker.GameFiles
var padc = (align - (w.Position % align)) % align;
if (padc > 0) w.Write(new byte[padc]);
}
if (chunk is AwcDataChunk datachunk && (datachunk.Data != null))
{
if (MultiChannelFlag)
{
if (MultiChannelEncryptFlag && !WholeFileEncrypted)
{
var bcount = (int)(MultiChannelSource.StreamFormatChunk?.BlockCount ?? 0);
var bsize = (int)(MultiChannelSource.StreamFormatChunk?.BlockSize ?? 0);
for (int b = 0; b < bcount; b++)
{
int srcoff = b * bsize;
int blen = Math.Max(Math.Min(bsize, datachunk.Data.Length - srcoff), 0);
var bdat = new byte[blen];
Buffer.BlockCopy(datachunk.Data, srcoff, bdat, 0, blen);
Encrypt_RSXXTEA(bdat);
Buffer.BlockCopy(bdat, 0, datachunk.Data, srcoff, blen);
}
}
}
else
{
if (SingleChannelEncryptFlag && !WholeFileEncrypted)
{
Encrypt_RSXXTEA(datachunk.Data);
}
}
}
chunk.Write(w);
}
@ -285,10 +360,22 @@ namespace CodeWalker.GameFiles
{
AwcXml.ValueTag(sb, indent, "ChunkIndices", true.ToString());
}
if (SingleChannelEncryptFlag)
{
AwcXml.ValueTag(sb, indent, "SingleChannelEncrypt", true.ToString());
}
if (MultiChannelFlag)
{
AwcXml.ValueTag(sb, indent, "MultiChannel", true.ToString());
}
if (MultiChannelEncryptFlag)
{
AwcXml.ValueTag(sb, indent, "MultiChannelEncrypt", true.ToString());
}
if (WholeFileEncrypted)
{
AwcXml.ValueTag(sb, indent, "WholeFileEncrypt", true.ToString());
}
if ((Streams?.Length ?? 0) > 0)
{
AwcXml.OpenTag(sb, indent, "Streams");
@ -308,7 +395,10 @@ namespace CodeWalker.GameFiles
{
Version = (ushort)Xml.GetChildUIntAttribute(node, "Version");
ChunkIndicesFlag = Xml.GetChildBoolAttribute(node, "ChunkIndices");
SingleChannelEncryptFlag = Xml.GetChildBoolAttribute(node, "SingleChannelEncrypt");
MultiChannelFlag = Xml.GetChildBoolAttribute(node, "MultiChannel");
MultiChannelEncryptFlag = Xml.GetChildBoolAttribute(node, "MultiChannelEncrypt");
WholeFileEncrypted = Xml.GetChildBoolAttribute(node, "WholeFileEncrypt");
var snode = node.SelectSingleNode("Streams");
if (snode != null)
@ -1177,7 +1267,7 @@ namespace CodeWalker.GameFiles
Buffer.BlockCopy(DataChunk.Data, srcoff, bdat, 0, blen);
if (Awc.MultiChannelEncryptFlag && !Awc.WholeFileEncrypted)
{
AwcFile.Decrypt_RSXXTEA(bdat, GTA5Keys.PC_AWC_KEY);
AwcFile.Decrypt_RSXXTEA(bdat);
}
var blk = new AwcStreamDataBlock(bdat, StreamFormatChunk, endianess, mcsoff);
blist.Add(blk);
@ -1188,7 +1278,7 @@ namespace CodeWalker.GameFiles
{
if (Awc.SingleChannelEncryptFlag && !Awc.WholeFileEncrypted)
{
AwcFile.Decrypt_RSXXTEA(DataChunk.Data, GTA5Keys.PC_AWC_KEY);
AwcFile.Decrypt_RSXXTEA(DataChunk.Data);
}
}
}