KCTF Android JNI Mixed Flow

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Guides your agent through solving Android crackme challenges that split their checks between Java and native code.

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Details

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About this skill

Solve KCTF Android APKs with JNI bridges, native .so logic, channel splits, and mixed Java/native state machines. Use when the artifact includes classes.dex, lib/*.so, and the check is split across Java input, JNI dispatch, and native code.

What this skill tells your AI

The instructions your AI receives, as published by manyuegong33/r0crawl_skills in skills/kctf-android-jni-mixed-flow/SKILL.md and read by ahel’s review.

Workflow

Identify package, activity, JNI exports, and the native library path.
Separate Java-side validation from native-side validation.
Trace the full path:
- Java input
- JNI entry
- native state transforms
- final success string
Check for channel splits, hex/byte conversion, or fixed-size buffers before solving.
Verify on the original APK or extracted sample, not on decompiled pseudocode alone.

Use this pattern

classes.dex + lib/*.so
Java_com_* JNI exports
even/odd or split-channel transforms
native anti-debug / state-machine / crypto logic

Reference

references/pattern.md

Signals

GitHub stars: 294
Forks: 103
Last commit: Sep 2026

Advanced

Item type: skill
Key: kctf-android-jni-mixed-flow
Source: github.com/manyuegong33/r0crawl_skills

github.com/manyuegong33/r0crawl_skills