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https://github.com/bongtrop/hbctool
Hermes Bytecode Reverse Engineering Tool (Assemble/Disassemble Hermes Bytecode)
https://github.com/bongtrop/hbctool
hermes-bytecode hermes-engine javascript-engine react-native reverse-engineering
Last synced: about 1 month ago
JSON representation
Hermes Bytecode Reverse Engineering Tool (Assemble/Disassemble Hermes Bytecode)
- Host: GitHub
- URL: https://github.com/bongtrop/hbctool
- Owner: bongtrop
- License: mit
- Created: 2021-01-10T05:15:31.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2023-12-10T21:12:57.000Z (about 1 year ago)
- Last Synced: 2024-10-03T01:19:11.678Z (3 months ago)
- Topics: hermes-bytecode, hermes-engine, javascript-engine, react-native, reverse-engineering
- Language: Python
- Homepage:
- Size: 34.9 MB
- Stars: 446
- Watchers: 12
- Forks: 71
- Open Issues: 14
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- Awesome-Pentest - hbctool - Hermes Bytecode Reverse Engineering Tool (Assemble/Disassemble Hermes Bytecode). `React Native` (Reverse Engineering Tools / Metadata Tools)
README
# hbctool
[](https://python.org) [](https://badge.fury.io/py/hbctool) [](/LICENSE)
A command-line interface for disassembling and assembling the Hermes Bytecode.
Since the React Native team created their own JavaScript engine (named Hermes) for running the React Native application, the JavaScript source code is often compiled to the Hermes bytecode. In the penetration test project, I found that some React Native applications have already been migrated to the Hermes engine. It is really head for me to analyze or patch those applications. Therefore, I created hbctool for helping any pentester to test the Hermes bytecode.
> [Hermes](https://hermesengine.dev/) is an open-source JavaScript engine optimized for running React Native apps on Android. For many apps, enabling Hermes will result in improved start-up time, decreased memory usage, and smaller app size. At this time Hermes is an opt-in React Native feature, and this guide explains how to enable it.
Special thanks to [ErbaZZ](https://github.com/ErbaZZ) and [Jusmistic](https://github.com/Jusmistic) for helping me research and develop this tool.
For more information, please visit:
[https://suam.wtf/posts/react-native-application-static-analysis-en/](https://suam.wtf/posts/react-native-application-static-analysis-en/)
## Screenshot
This video with MP4 format can be found at [/image/hbctool_example.mp4](/image/hbctool_example.mp4).
## Installation
To install hbctool, simply use pip:
```
pip install hbctool
```
## Usage
Please run `hbctool --help` to show the usage.
```
hbctool --help
A command-line interface for disassembling and assembling
the Hermes Bytecode.
Usage:
hbctool disasm
hbctool asm
hbctool --help
hbctool --version
Operation:
disasm Disassemble Hermes Bytecode
asm Assemble Hermes Bytecode
Args:
HBC_FILE Target HBC file
HASM_PATH Target HASM directory path
Options:
--version Show hbctool version
--help Show hbctool help manual
Examples:
hbctool disasm index.android.bundle test_hasm
hbctool asm test_hasm index.android.bundle
```
> For Android, the HBC file normally locates at `assets` directory with `index.android.bundle` filename.
## Support
hbctool currently supports the following Hermes Bytecode version:
- [Hermes Bytecode version 59](/hbctool/hbc/hbc59/)
- [Hermes Bytecode version 62](/hbctool/hbc/hbc62/)
- [Hermes Bytecode version 74](/hbctool/hbc/hbc74/)
- [Hermes Bytecode version 76](/hbctool/hbc/hbc76/)
## Contribution
Feel free to create an issue or submit the merge request. Anyway you want to contribute this project. I'm very happy about it.
However, please run the unit test before submiting the pull request.
```
cd hbctool
python test.py
```
I use poetry to build this tool. To build it yourself, simply execute:
1. `poetry install`
2. `poetry build`
4. `pip install --force-reinstall dist/hbctool--py3-none-any.whl`
## Next Step
- Add the other Hermes bytecode versions
- Create a class abstraction
- Support overflow patching
- Do all TODO, NOTE, FIXME in source code