NOJSCAP/client

NOJSCAP client

The client directory includes NOJSCAP client implementations in multiple languages. Each version takes a challenge string and a difficulty level, then searches for a nonce such that the SHA-256 hash of challenge + nonce begins with the required number of leading zero bits.

Implementations

• C: nojscap.c
• Go: nojscap.go
• Python: nojscap.py
• JavaScript (Node.js): nojscap.js
• Rust: nojscap.rs

Each implementation provides similar usage and functionality.

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C Version

Compilation

You need:

• GCC or any C compiler
• OpenSSL development libraries (libssl-dev on Debian-based systems)

gcc -O2 -o nojscap nojscap.c -lssl -lcrypto

Usage

./nojscap <challenge_string> <difficulty_bits>

• challenge_string: Any input string used as the challenge.
• difficulty_bits: Integer between 1 and 256. Higher values are more computationally expensive.

Example

./nojscap libroot12 26
Attempts: 0
Attempts: 1048576
Attempts: 2097152
Attempts: 3145728
Attempts: 4194304
Attempts: 5242880
Attempts: 6291456
Found nonce: 6368109
Hash: 0000000e724d990815e84e8a53f3f2410875046fe62a050de830d706b853ebe2

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Python

python3 nojscap.py <challenge_string> <difficulty_bits>

May require the hashlib module if using older Python verisons (standard in Python 3).

Go

go run nojscap.go <challenge_string> <difficulty_bits>

Requires Go 1.13+.

JavaScript (Node.js)

node nojscap.js <challenge_string> <difficulty_bits>

Uses the built-in crypto module.

Rust

rustc nojscap.rs -o nojscap_rs
./nojscap_rs <challenge_string> <difficulty_bits>

Requires Rust and sha2 crate if using the Cargo version.