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Update SupersetZip.cs #2

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Update SupersetZip.cs #2

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66 changes: 37 additions & 29 deletions AsusSupersetDecryptor/SupersetZip.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
using System.Globalization;
using System.Globalization;
using System.IO.Compression;
using System.Runtime.InteropServices;
using Vanara.PInvoke;
Expand Down Expand Up @@ -72,7 +72,7 @@ public SupersetZip(string zipFileName)
throw new FormatException("Invalid ASUS ZIP file.");
}
}

public void ReconstructZipFile(Stream outStream)
{
using (var encStream = _encEntry.Open())
Expand All @@ -88,44 +88,52 @@ public void ReconstructZipFile(Stream outStream)
zipDataStream.CopyTo(outStream);
}
}

// I changed this because of
private MemoryStream DecryptZipCentralDirectory(Stream encStream)
{
if (!InitializeDecryptionContext(out var hprov, out var hcryptkey))
throw new InvalidOperationException("Unable to initialize decryption context for whatever reason.");

var ms = new MemoryStream();
var bytes = new byte[256];

while (encStream.Position < encStream.Length)
using (var memoryStream = new MemoryStream())
{
var actualCount = encStream.Read(bytes);
var final = encStream.Position >= encStream.Length;

if (!AdvApi32.CryptDecrypt(
hcryptkey,
Crypt32.HCRYPTHASH.NULL,
final,
0,
bytes,
ref actualCount
))
encStream.CopyTo(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);

var ms = new MemoryStream();
var bytes = new byte[256];

while (memoryStream.Position < memoryStream.Length)
{
throw new InvalidOperationException("Decryption failed for whatever reason.");
var actualCount = memoryStream.Read(bytes);
var final = memoryStream.Position >= memoryStream.Length;

if (!AdvApi32.CryptDecrypt(
hcryptkey,
Crypt32.HCRYPTHASH.NULL,
final,
0,
bytes,
ref actualCount
))
{
throw new InvalidOperationException("Decryption failed for whatever reason.");
}

ms.Write(bytes, 0, actualCount);
}

ms.Write(bytes[0..actualCount]);
}
ms.Seek(0, SeekOrigin.Begin);
ms.SetLength(ms.Length - 4); // We don't care about the 4-byte checksum at the end.

AdvApi32.CryptReleaseContext(hprov);
AdvApi32.CryptDestroyKey(hcryptkey);

ms.Seek(0, SeekOrigin.Begin);
ms.SetLength(ms.Length - 4); // We don't give a single flying fuck about the 4-byte checksum at the end.

AdvApi32.CryptReleaseContext(hprov);
AdvApi32.CryptDestroyKey(hcryptkey);

return ms;
return ms;
}
}



private bool InitializeDecryptionContext(out AdvApi32.SafeHCRYPTPROV hprov, out Crypt32.HCRYPTKEY key)
{
var ret = false;
Expand Down Expand Up @@ -215,4 +223,4 @@ public void Dispose()
_archive.Dispose();
}
}
}
}