ja3-rs

A small JA3 TLS fingerprinting library written in Rust.

This crate enables a consumer to fingerprint the ClientHello portion of a TLS handshake. It can hash TLS handshakes over IPv4 and IPv6. It heavily depends on the tls-parser project from Rusticata.

It supports generating fingerprints from packet capture files as well as live-captures on a network interface, both using libpcap.

See the original JA3 project for more information.

Example of fingerprinting a packet capture file:

use ja3::Ja3;

let mut ja3 = Ja3::new("test.pcap")
                    .process_pcap()
                    .unwrap();

// Now we have a Vec of Ja3Hash objects
for hash in ja3 {
    println!("{}", hash);
}

Example of fingerprinting a live capture:

use ja3::Ja3;

let mut ja3 = Ja3::new("eth0")
                    .process_live()
                    .unwrap();
while let Some(hash) = ja3.next() {
    println!("Hash: {}", hash);
}

Benchmarks

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
ja3 huge-cap.pcap	153.2 ± 2.3	149.8	157.2	34.85 ± 2.82
./target/release/examples/ja3 huge-cap.pcap	4.4 ± 0.3	3.6	5.5	1.00