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(DPM): alternative decryption.

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This commit is contained in:
morkt 2019-03-31 17:23:08 +04:00
parent 887cf0183c
commit e216f25d14
1 changed files with 38 additions and 6 deletions
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44
ArcFormats/HSP/ArcDPM.cs
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@ -46,7 +46,7 @@ namespace GameRes.Formats.HSP
Signatures = new uint[] { 0x584D5044, 0 };
}
static readonly uint DefaultKey = 0xAC52AE58;
static readonly uint DefaultKey = 0xAC52AE58; // 0x24B70413
public override ArcFile TryOpen (ArcView file)
{
@ -76,7 +76,7 @@ namespace GameRes.Formats.HSP
{
var name = file.View.ReadString (index_offset, 0x10);
index_offset += 0x14;
var entry = FormatCatalog.Instance.Create<DpmEntry> (name);
var entry = Create<DpmEntry> (name);
entry.Key = file.View.ReadUInt32 (index_offset);
entry.Offset = file.View.ReadUInt32 (index_offset+4) + base_offset;
entry.Size = file.View.ReadUInt32 (index_offset+8);
@ -98,22 +98,34 @@ namespace GameRes.Formats.HSP
if (null == dent || null == darc || 0 == dent.Key)
return base.OpenEntry (arc, entry);
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
darc.DecryptEntry (data, dent.Key);
darc.DecryptEntry2 (data, dent.Key);
return new BinMemoryStream (data, entry.Name);
}
static uint FindExeKey (ExeFile exe, long dpm_offset)
{
if (!exe.ContainsSection (".rdata"))
return DefaultKey;
uint base_offset = (uint)(dpm_offset - 0x10000);
var offset_str = base_offset.ToString() + '\0';
var offset_bytes = Encoding.ASCII.GetBytes (offset_str);
var key_pos = exe.FindString (exe.Sections[".rdata"], offset_bytes);
long key_pos = -1;
if (exe.ContainsSection (".rdata"))
key_pos = exe.FindString (exe.Sections[".rdata"], offset_bytes);
if (-1 == key_pos && exe.ContainsSection (".data"))
key_pos = exe.FindString (exe.Sections[".data"], offset_bytes);
if (-1 == key_pos)
return DefaultKey;
return exe.View.ReadUInt32 (key_pos+0x17);
}
DpmxScheme DefaultScheme = new DpmxScheme { KnownKeys = new Dictionary<string, uint>() };
public IDictionary<string, uint> KnownKeys { get { return DefaultScheme.KnownKeys; } }
public override ResourceScheme Scheme
{
get { return DefaultScheme; }
set { DefaultScheme = (DpmxScheme)value; }
}
}
internal class DpmEntry : Entry
@ -153,5 +165,25 @@ namespace GameRes.Formats.HSP
data[i] = val;
}
}
internal void DecryptEntry2 (byte[] data, uint entry_key)
{
byte s1 = 0x5A;
byte s2 = 0xA5;
s1 = (byte)(Seed1 + ((entry_key >> 16) ^ (entry_key + s1)));
s2 = (byte)(Seed2 + ((entry_key >> 24) ^ ((entry_key >> 8) + s2)));
byte val = 0;
for (int i = 0; i < data.Length; ++i)
{
val += (byte)((s1 ^ data[i]) - s2);
data[i] = val;
}
}
}
[Serializable]
public class DpmxScheme : ResourceScheme
{
public IDictionary<string, uint> KnownKeys;
}
}