initial commit

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

soliton/fuzz/fuzz_targets/fuzz_verification_phrase.rs

@@ -0,0 +1,18 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use soliton::verification::verification_phrase;
+
+fuzz_target!(|data: &[u8]| {
+    // verification_phrase validates exact size (3200 bytes each).
+    // Fixed split: inputs ≥ 6400 bytes always produce two exact 3200-byte
+    // halves regardless of total length, so the SHA-512 word derivation and
+    // rejection-sampling loop (20-rehash cap) are reachable from any input
+    // of 6400+ bytes. A midpoint split would only reach that path for
+    // inputs of exactly 6400 bytes.
+    const PK_SIZE: usize = 3200; // SOLITON_PUBLIC_KEY_SIZE
+    const MIN: usize = 2 * PK_SIZE;
+    if data.len() < MIN {
+        return;
+    }
+    let _ = verification_phrase(&data[..PK_SIZE], &data[PK_SIZE..MIN]);
+});