EvilBytecode

EvilBytecode / CustomDpapi

Public

Calling the undocumented DPAPI RPC interface directly, no more calling public CryptUnprotectData!

75
7
69% credibility
Found Feb 05, 2026 at 49 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
C++
AI Summary

This project provides a code example and detailed explanation of how Windows' data protection system works at a low level by mimicking its internal unlocking process for learning purposes.

How It Works

1
🔍 Discover Windows' Secret Keeper

You stumble upon a fun guide explaining the hidden ways Windows protects your private notes and passwords.

2
📖 Dive into the Mystery

You read the detective story of how someone peeked inside Windows to understand its protection magic.

3
🧪 Create a Test Secret

You make up a simple private message to play with, like a pretend password.

4
🔒 Hide Your Secret Normally

You use Windows' everyday tool to lock away your message safely.

5
✨ Unlock with Insider Trick

You try the special hidden path to reveal your secret, feeling like a security wizard.

✅ Secret Revealed Perfectly

Your message comes back exactly as you hid it, and now you truly get how Windows keeps things safe.

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Star Growth

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AI-Generated Review

What is CustomDpapi?

CustomDpapi lets you decrypt DPAPI-encrypted data in C++ by calling the undocumented RPC interface directly, ditching the public CryptUnprotectData wrapper. It targets the protected_storage endpoint in lsass.exe over local ncalrpc, handling RPC marshalling, secondary decryption, and padding removal. Users get a demo binary that encrypts plaintext via standard APIs then recovers it raw, exposing DPAPI internals without high-level abstractions.

Why is it gaining traction?

Bypassing CryptUnprotectData for direct RPC calling reveals lsass crypto stages, hooking devs obsessed with undocumented Windows interfaces over boring public APIs. Its reverse-engineered proxy info and NdrClientCall3 usage stands out for customdpapi experiments, drawing 70 stars from security folks probing low-level calling like function calling in github copilot or ollama tool calling github. Niche appeal trumps alternatives by demystifying "security through obscurity."

Who should use this?

Security researchers dissecting DPAPI for credential dumping analysis. Pentesters authorized to probe lsass RPC in red-team ops. Reverse engineers in C++ tweaking undocumented interfaces akin to calling github api with token or github variant calling.

Verdict

Worth forking for Windows internals education—thorough README offsets 70 stars and 0.7% credibility score signaling prototype maturity. Avoid production; stick to VMs per its legal warnings.

(178 words)

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