Simple HS256 JWT token brute force cracker.
Effective only to crack JWT tokens with weak secrets. Recommendation: Use strong long secrets or RS256 tokens.
Install
With npm:
1 | npm install --global jwt-cracker |
Usage
From command line:
1 | jwt-cracker <token> [<alphabet>] [<maxLength>] |
Where:
- token: the full HS256 JWT token string to crack
- alphabet: the alphabet to use for the brute force (default: «abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ0123456789»)
- maxLength: the max length of the string generated during the brute force (default: 12)
Requirements
This script requires Node.js version 6.0.0 or higher
Example
Cracking the default jwt.io example:
1 | jwt-cracker "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ" "abcdefghijklmnopqrstuwxyz" 6 |
It takes about 2 hours in a Macbook Pro (2.5GHz quad-core Intel Core i7).
Contributing
Everyone is very welcome to contribute to this project. You can contribute just by submitting bugs or suggesting improvements by opening an issue on GitHub.
License
Licensed under MIT License. © Luciano Mammino.