initial commit

Signed-off-by: Kamal Tufekcic <kamal@lo.sh>

soliton/fuzz/fuzz_targets/fuzz_ratchet_from_bytes_epoch.rs

@@ -0,0 +1,18 @@
+#![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);
+});