initial commit

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

soliton/fuzz/fuzz_targets/fuzz_ratchet_encrypt.rs

@@ -0,0 +1,19 @@
+#![no_main]
+#![allow(deprecated)]
+use libfuzzer_sys::fuzz_target;
+use soliton::ratchet::RatchetState;
+
+fuzz_target!(|data: &[u8]| {
+    // Deserialize adversarial state, then encrypt.
+    // Exercises: ChainExhausted guard,
+    // perform_kem_ratchet_send (keygen + encaps + kdf_root),
+    // kdf_msg_key, nonce construction, AAD building, AEAD encrypt,
+    // and the session-fatal zeroize path on AEAD failure.
+    let Ok(mut state) = RatchetState::from_bytes(data) else {
+        return;
+    };
+
+    // Fixed plaintext — fingerprints are stored in the deserialized state,
+    // not passed as parameters.
+    let _ = state.encrypt(b"fuzz");
+});