Change SipHash2-4 -> SipHash1-3 (#1)

Author: dccsillag

src/cache.rs

@@ -2,7 +2,7 @@ use std::any::{Any, TypeId};
 use std::cell::RefCell;
 use std::collections::HashMap;
 
-use siphasher::sip128::{Hasher128, SipHasher};
+use siphasher::sip128::{Hasher128, SipHasher13};
 
 use crate::constraint::Join;
 use crate::input::Input;
@@ -23,7 +23,7 @@ where
     CACHE.with(|cache| {
         // Compute the hash of the input's key part.
         let key = {
-            let mut state = SipHasher::new();
+            let mut state = SipHasher13::new();
             input.key(&mut state);
             let hash = state.finish128().as_u128();
             (id, hash)

src/constraint.rs

@@ -1,7 +1,7 @@
 use std::cell::RefCell;
 use std::hash::Hash;
 
-use siphasher::sip128::{Hasher128, SipHasher};
+use siphasher::sip128::{Hasher128, SipHasher13};
 
 use crate::track::Trackable;
 
@@ -121,7 +121,7 @@ where
 /// Produce a 128-bit hash of a value.
 #[inline]
 pub fn hash<T: Hash>(value: &T) -> u128 {
-    let mut state = SipHasher::new();
+    let mut state = SipHasher13::new();
     value.hash(&mut state);
     state.finish128().as_u128()
 }

src/prehashed.rs

@@ -4,7 +4,7 @@ use std::fmt::{self, Debug, Formatter};
 use std::hash::{Hash, Hasher};
 use std::ops::Deref;
 
-use siphasher::sip128::{Hasher128, SipHasher};
+use siphasher::sip128::{Hasher128, SipHasher13};
 
 /// A wrapper type with precomputed hash.
 ///
@@ -62,7 +62,7 @@ impl<T: Hash + 'static> Prehashed<T> {
 fn hash<T: Hash + 'static>(item: &T) -> u128 {
     // Also hash the TypeId because the type might be converted
     // through an unsized coercion.
-    let mut state = SipHasher::new();
+    let mut state = SipHasher13::new();
     item.type_id().hash(&mut state);
     item.hash(&mut state);
     state.finish128().as_u128()