initial commit

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

soliton/fuzz/fuzz_targets/fuzz_decrypt_first_message.rs

@@ -0,0 +1,14 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use soliton::ratchet::RatchetState;
+use zeroize::Zeroizing;
+
+fuzz_target!(|data: &[u8]| {
+    let ck: [u8; 32] = [0x22; 32];
+    let aad = b"lo-dm-v1";
+
+    // decrypt_first_message must never panic regardless of input.
+    // Exercises: random-nonce AEAD decrypt path (distinct from counter-based
+    // decrypt in fuzz_ratchet_decrypt).
+    let _ = RatchetState::decrypt_first_message(Zeroizing::new(ck), data, aad);
+});