feat: update dependencies, optimize

src/util.rs

@@ -96,7 +96,7 @@ pub fn make_key256_and_nonce() -> (SecVec, SecVec) {
 pub fn simple_kdf(input: &[u8]) -> Vec<u8> {
     let mut input = input.to_vec();
     for _ in 0..8 {
-        let mut sha256 = DigestWrite::sha256().expect("SHOULD NOT HAPPEN");
+        let mut sha256 = DigestWrite::sha256();
         sha256.write_all(&input).expect("SHOULD NOT HAPPEN");
         input = sha256.digest();
     }