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feat: support .epk and .fcd decryption

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scientificworld
2026-02-17 17:00:41 +08:00
parent 75b2c78665
commit 74050870dc
3 changed files with 354 additions and 17 deletions
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58
ArcFormats/aNCHOR/AudioFCD.cs
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@@ -27,6 +27,8 @@ using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Cryptography;
using GameRes.Utility;
namespace GameRes.Formats.Anchor
{
@@ -45,11 +47,57 @@ namespace GameRes.Formats.Anchor
public override SoundInput TryOpen (IBinaryStream file)
{
file.Position = 4;
// guess: big endian, version=2, type=0 (ogg), offset=0xC
byte[] data = { 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x4F, 0x67, 0x67, 0x53 };
if (!file.ReadBytes (0x0C).SequenceEqual (data))
throw new NotSupportedException();
return new OggInput (new StreamRegion (file.AsStream, 0x0C));
uint version = Binary.BigEndian (file.ReadUInt16());
if (version != 2)
return null;
uint count = Binary.BigEndian (file.ReadUInt16());
uint offset = Binary.BigEndian (file.ReadUInt32());
Stream region = new StreamRegion (file.AsStream, offset);
if (count == 0 && offset == 0x0C)
return new OggInput (region);
if (count == 1 && offset == 0x1C)
{
file.Position = 0x0C;
uint type = Binary.BigEndian (file.ReadUInt32());
if (type != 2)
return null;
var md5 = new MD5();
md5.Initialize();
md5.Update (file.ReadBytes (0xC), 0, 0xC);
md5.Update (DefaultScheme.Md5Addition, 0, 0x4000);
md5.Final();
var key = new byte[16];
Buffer.BlockCopy (md5.State, 0, key, 0, 16);
var encryption = new Mk2Blowfish (key, DefaultScheme.Context);
var stream = new InputCryptoStream (region, encryption.CreateDecryptor());
var mem = new MemoryStream();
stream.CopyTo (mem);
mem.Position = 0;
return new OggInput (mem);
}
return null;
}
FcdScheme DefaultScheme = new FcdScheme();
public override ResourceScheme Scheme
{
get { return DefaultScheme; }
set { DefaultScheme = (FcdScheme)value; }
}
}
[Serializable]
public class FcdScheme : ResourceScheme
{
public byte[] Context;
public byte[] Md5Addition;
}
}