Hisn — .NET Packer & In-Memory Loader

.NET Framework 4.7.2+ · dnlib 3.6.0 · MIT License**

What is Hisn?

Hisn packs your .NET app into encrypted resource chunks, embeds a tiny runtime (Hisn.Runtime.dll), loads it from memory at run time, and calls your Startup method—so you don’t ship extra files with the protected app.

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Features

• Resource packing: split payload into chunks, AES-CBC encrypt, add HMAC integrity tags, write a manifest (HISN|v1|<nonce>).
• In-memory load: embed Hisn.Runtime.dll as a resource and load it via AssemblyResolve.
• Auto startup: patch <Module>..cctor to invoke Hisn.Runtime.Bootstrapper.Startup.
• method trapping: replace method bodies with a safe throw to deter quick inspection.
• Modular design: clear separation of packer, loader embedding, runtime, and crypto helpers.

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Requirements

• .NET Framework 4.7.2+
• dnlib 3.6.0
• Hisn.Runtime.dll available at protect-time (it is embedded as a resource)

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Hisn will:

Build hisn.main.manifest + encrypted chunk resources hisn.main.cXX.

Embed Hisn.Runtime.dll as a resource (e.g., "RT").

Patch ..cctor to install the resolver and call Bootstrapper.Startup.

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How it Works (at a glance)

ResourcePacker → creates the manifest and AES/HMAC chunks and embeds them as resources.

DllEmbedHooker → embeds Hisn.Runtime.dll and injects a call in ..cctor.

EmbeddedResolver → handles AppDomain.AssemblyResolve, loads the embedded runtime from memory, and calls Startup.

Hisn.Runtime → parses the manifest, verifies/decrypts chunks, assembles the payload, and loads/executes it from memory.

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Production Tips (Customize)

Change secrets/keys (e.g., default MasterKey, "BuildSecret-CHANGE-ME").

Rename resource IDs (manifest/chunk prefixes, embedded DLL resource name).

Adjust startup: update startupType/startupMethod if your bootstrap signature differs.

Use Anti-Dump