xorfiles

A command-line utility to XOR two files. Useful for certain types of CTF challenge.

Usage

./xorfiles FILE1 FILE2

Features

• XOR two files: xorfiles FILE1 FILE2
• XOR one file with stdin: xorfiles FILE1 < FILE2
• High throughput compared to Python and Ruby implementations

Installation

From Github

git clone https://github.com/sciguy16/xorfiles
cargo build --release
cargo run --release -- -h

From Crates.io

cargo install xorfiles

Roadmap/Todo

• Optionally loop the shorter file (like a multi-byte XOR)
• Limit the number of bytes read/written
• Output to file
• Hexdump on the input and output stages
• Benchmark against C implementations
• Optimise the Ruby and Python benchmarks further for better competition

Benchmarks

Benchmarks run with a 1 GB file XORed with itself, generated with dd if=/dev/zero of=big_file bs=1M count=1000. The Rust version was tested in two operating modes: XOR two files together and one file with stdin.

The following command was used to measure the throughput:

<implementation> big_file big_file | pv > /dev/null