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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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34
ArcFormats/aNCHOR/ArcFPD.cs
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@@ -63,7 +63,7 @@ namespace GameRes.Formats.Anchor {
return null;
uint index_size = (uint)(data_start - offset);
var key = QueryKey();
var key = DefaultScheme.ArchiveKey;
var dir = new List<Entry>(count);
using (var input = file.CreateStream(offset, (uint)(data_start - offset)))
@@ -96,6 +96,8 @@ namespace GameRes.Formats.Anchor {
for (int i = 0; i < count; i++) {
dir[i].Name = Binary.GetCString(names, (int)name_offsets[i], Encoding.UTF8);
dir[i].Type = FormatCatalog.Instance.GetTypeFromName(dir[i].Name);
if (dir[i].Name.EndsWith(".epk"))
dir[i].Type = "script";
}
}
return new FpdArchive(file, this, dir, key);
@@ -105,17 +107,25 @@ namespace GameRes.Formats.Anchor {
public override Stream OpenEntry(ArcFile arc, Entry entry) {
var farc = arc as FpdArchive;
var pent = entry as PackedEntry;
var input = farc.File.CreateStream(entry.Offset, entry.Size);
var decrypted = new ByteStringEncryptedStream(input, farc.Key);
Stream input = farc.File.CreateStream(entry.Offset, entry.Size);
input = new ByteStringEncryptedStream(input, farc.Key);
if (pent.IsPacked)
return new ZLibStream(decrypted, CompressionMode.Decompress);
else
return decrypted;
// TODO: epk decryption
}
byte[] QueryKey() {
return DefaultScheme.ArchiveKey;
input = new ZLibStream(input, CompressionMode.Decompress);
if (pent.Name.EndsWith(".epk")) {
var mem = new MemoryStream();
input.CopyTo(mem);
mem.Seek(-0x20, SeekOrigin.End);
var buf = new byte[4];
mem.Read(buf, 0, 4);
uint last = Binary.BigEndian(BitConverter.ToUInt32(buf, 0));
mem.Seek(0, SeekOrigin.Begin);
var key = Encoding.UTF8.GetBytes(Path.GetFileNameWithoutExtension(pent.Name));
var encryption = new Mk2Blowfish(key, DefaultScheme.EpkContext);
input = new InputCryptoStream(mem, encryption.CreateDecryptor());
input = new LimitStream(input, last);
}
return input;
}
FpdScheme DefaultScheme = new FpdScheme();
@@ -129,6 +139,6 @@ namespace GameRes.Formats.Anchor {
[Serializable]
public class FpdScheme : ResourceScheme {
public byte[] ArchiveKey;
public byte[] EpkKey;
public byte[] EpkContext;
}
}