libsoliton/soliton/fuzz/fuzz_targets/fuzz_session_init_roundtrip.rs

#![no_main]
use libfuzzer_sys::fuzz_target;
use soliton::kex::{decode_session_init, encode_session_init};

// No keygen, no crypto operations — pure wire-format parser test.
// Property: encode(decode(data)) == data for any data that parses successfully.
fuzz_target!(|data: &[u8]| {
    let Ok(si) = decode_session_init(data) else {
        return;
    };
    let re_encoded =
        encode_session_init(&si).expect("encode_session_init cannot fail on a valid SessionInit");
    assert_eq!(
        data,
        re_encoded.as_slice(),
        "encode(decode(wire)) != wire — format malleability detected"
    );
});