diff --git a/Cargo.lock b/Cargo.lock
index 5b4009e5..252ca27d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -71,6 +71,17 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "blake2"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "10a5720225ef5daecf08657f23791354e1685a8c91a4c60c7f3d3b2892f978f4"
+dependencies = [
+ "crypto-mac 0.8.0",
+ "digest 0.9.0",
+ "opaque-debug 0.3.0",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.7.3"
@@ -234,7 +245,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4434400df11d95d556bac068ddfedd482915eb18fe8bea89bc80b6e4b1c179e5"
 dependencies = [
  "generic-array 0.12.3",
- "subtle",
+ "subtle 1.0.0",
+]
+
+[[package]]
+name = "crypto-mac"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b584a330336237c1eecd3e94266efb216c56ed91225d634cb2991c5f3fd1aeab"
+dependencies = [
+ "generic-array 0.14.4",
+ "subtle 2.4.0",
 ]
 
 [[package]]
@@ -288,6 +309,28 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
+[[package]]
+name = "fasthash"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "032213946b4eaae09117ec63f020322b78ca7a31d8aa2cf64df3032e1579690f"
+dependencies = [
+ "cfg-if 0.1.10",
+ "fasthash-sys",
+ "num-traits",
+ "seahash",
+ "xoroshiro128",
+]
+
+[[package]]
+name = "fasthash-sys"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6de941abfe2e715cdd34009d90546f850597eb69ca628ddfbf616e53dda28f8"
+dependencies = [
+ "gcc",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -314,6 +357,12 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -450,7 +499,7 @@ dependencies = [
  "hex",
  "log",
  "pretty_env_logger",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "serde",
  "sha2",
@@ -467,7 +516,7 @@ dependencies = [
  "base64 0.13.0",
  "bytes 0.4.12",
  "chrono",
- "crypto-mac",
+ "crypto-mac 0.7.0",
  "err-derive",
  "futures",
  "futures-util",
@@ -483,7 +532,7 @@ dependencies = [
  "log",
  "md-5",
  "percent-encoding",
- "rand",
+ "rand 0.7.3",
  "roxmltree",
  "sha2",
  "tokio",
@@ -505,7 +554,7 @@ dependencies = [
  "garage_util 0.1.1",
  "hex",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "serde",
  "serde_bytes",
@@ -530,7 +579,7 @@ dependencies = [
  "garage_util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "serde",
  "serde_bytes",
@@ -554,7 +603,7 @@ dependencies = [
  "hyper",
  "hyper-rustls",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "rustls",
  "serde",
@@ -582,7 +631,7 @@ dependencies = [
  "hyper",
  "hyper-rustls",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "rustls",
  "serde",
@@ -607,7 +656,7 @@ dependencies = [
  "hex",
  "hexdump",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "serde",
  "serde_bytes",
@@ -631,7 +680,7 @@ dependencies = [
  "hex",
  "hexdump",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "serde",
  "serde_bytes",
@@ -643,14 +692,16 @@ dependencies = [
 name = "garage_util"
 version = "0.1.1"
 dependencies = [
+ "blake2",
  "err-derive",
+ "fasthash",
  "futures",
  "futures-util",
  "hex",
  "http",
  "hyper",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "roxmltree",
  "rustls",
@@ -676,7 +727,7 @@ dependencies = [
  "http",
  "hyper",
  "log",
- "rand",
+ "rand 0.7.3",
  "rmp-serde",
  "roxmltree",
  "rustls",
@@ -707,6 +758,12 @@ dependencies = [
  "roxmltree",
 ]
 
+[[package]]
+name = "gcc"
+version = "0.3.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
+
 [[package]]
 name = "generic-array"
 version = "0.12.3"
@@ -813,7 +870,7 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5dcb5e64cda4c23119ab41ba960d1e170a774c8e4b9d9e6a9bc18aabf5e59695"
 dependencies = [
- "crypto-mac",
+ "crypto-mac 0.7.0",
  "digest 0.8.1",
 ]
 
@@ -1310,6 +1367,19 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
+dependencies = [
+ "fuchsia-cprng",
+ "libc",
+ "rand_core 0.3.1",
+ "rdrand",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "rand"
 version = "0.7.3"
@@ -1319,7 +1389,7 @@ dependencies = [
  "getrandom",
  "libc",
  "rand_chacha",
- "rand_core",
+ "rand_core 0.5.1",
  "rand_hc",
 ]
 
@@ -1330,9 +1400,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.5.1",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
+dependencies = [
+ "rand_core 0.4.2",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
+
 [[package]]
 name = "rand_core"
 version = "0.5.1"
@@ -1348,7 +1433,16 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rdrand"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
+dependencies = [
+ "rand_core 0.3.1",
 ]
 
 [[package]]
@@ -1461,6 +1555,12 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "seahash"
+version = "3.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58f57ca1d128a43733fd71d583e837b1f22239a37ebea09cde11d8d9a9080f47"
+
 [[package]]
 name = "serde"
 version = "1.0.119"
@@ -1597,6 +1697,12 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
 
+[[package]]
+name = "subtle"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e81da0851ada1f3e9d4312c704aa4f8806f0f9d69faaf8df2f3464b4a9437c2"
+
 [[package]]
 name = "syn"
 version = "1.0.58"
@@ -2005,3 +2111,12 @@ name = "xmlparser"
 version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "114ba2b24d2167ef6d67d7d04c8cc86522b87f490025f39f0303b7db5bf5e3d8"
+
+[[package]]
+name = "xoroshiro128"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0eeda34baec49c4f1eb2c04d59b761582fd6330010f9330ca696ca1a355dfcd"
+dependencies = [
+ "rand 0.4.6",
+]
diff --git a/src/util/Cargo.toml b/src/util/Cargo.toml
index cb2baf06..93115843 100644
--- a/src/util/Cargo.toml
+++ b/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"
 
diff --git a/src/util/data.rs b/src/util/data.rs
index 657467ba..a1c292e7 100644
--- a/src/util/data.rs
+++ b/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()
 }