Add blake2 and xxhash hash functions

src/util/Cargo.toml

@@ -16,8 +16,10 @@ path = "lib.rs"
 rand = "0.7"
 hex = "0.3"
 sha2 = "0.8"
+blake2 = "0.9"
 err-derive = "0.2.3"
 log = "0.4"
+fasthash = "0.4"
 
 sled = "0.31"
 

src/util/data.rs

@@ -1,7 +1,6 @@
 use rand::Rng;
 use serde::de::{self, Visitor};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
-use sha2::{Digest, Sha256};
 use std::fmt;
 use std::time::{SystemTime, UNIX_EPOCH};
 
@@ -78,6 +77,8 @@ pub type UUID = FixedBytes32;
 pub type Hash = FixedBytes32;
 
 pub fn sha256sum(data: &[u8]) -> Hash {
+	use sha2::{Digest, Sha256};
+
 	let mut hasher = Sha256::new();
 	hasher.input(data);
 	let mut hash = [0u8; 32];
@@ -85,6 +86,27 @@ pub fn sha256sum(data: &[u8]) -> Hash {
 	hash.into()
 }
 
+pub fn blake2sum(data: &[u8]) -> Hash {
+	use blake2::{Blake2b, Digest};
+
+	let mut hasher = Blake2b::new();
+	hasher.update(data);
+	let mut hash = [0u8; 32];
+	hash.copy_from_slice(&hasher.finalize()[..32]);
+	hash.into()
+}
+
+pub type FastHash = u64;
+
+pub fn fasthash(data: &[u8]) -> FastHash {
+	use std::hash::Hasher;
+	use fasthash::{xx::Hasher64, FastHasher};
+
+	let mut h = Hasher64::new();
+	h.write(data);
+	h.finish()
+}
+
 pub fn gen_uuid() -> UUID {
 	rand::thread_rng().gen::<[u8; 32]>().into()
 }