libsoliton/soliton/fuzz/fuzz_targets/fuzz_ratchet_from_bytes_epoch.rs

#![no_main]
#![allow(deprecated)]
use libfuzzer_sys::fuzz_target;
use soliton::ratchet::RatchetState;

fuzz_target!(|data: &[u8]| {
    // Exercises from_bytes_with_min_epoch with fuzz-controlled min_epoch.
    // The first 8 bytes are the min_epoch threshold; the remainder is the
    // serialized ratchet state. This covers the epoch validation gate and
    // its interaction with field parsing — a distinct attack surface from
    // plain from_bytes.
    if data.len() < 8 {
        return;
    }

    let min_epoch = u64::from_be_bytes(data[..8].try_into().unwrap());
    let _ = RatchetState::from_bytes_with_min_epoch(&data[8..], min_epoch);
});