Add benchmark for encoding

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

Author: koushiro

Cargo.toml

@@ -1,21 +1,14 @@
 [package]
 name = "multihash"
-description = "Implementation of the multihash format"
-repository = "https://github.com/multiformats/rust-multihash"
-
-keywords = ["multihash", "ipfs"]
-
 version = "0.9.4"
-
 authors = ["dignifiedquire <dignifiedquire@gmail.com>"]
-
+edition = "2018"
 license = "MIT"
-
 readme = "README.md"
-
+description = "Implementation of the multihash format"
 documentation = "https://docs.rs/multihash/"
-
-edition = "2018"
+repository = "https://github.com/multiformats/rust-multihash"
+keywords = ["multihash", "ipfs"]
 
 [dependencies]
 blake2b_simd = { version = "0.5.9", default-features = false }
@@ -26,4 +19,10 @@ tiny-keccak = "1.4"
 unsigned-varint = "0.3"
 
 [dev-dependencies]
+criterion = "0.3"
+rand = "0.7"
 quickcheck = "0.9.2"
+
+[[bench]]
+name = "multihash"
+harness = false

benches/multihash.rs

@@ -0,0 +1,43 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use rand::Rng;
+
+use multihash::{encode, Hash};
+
+macro_rules! group_encode {
+    ($criterion:ident, $( $id:expr => $hash:expr, $input:expr)* ) => {{
+        let mut group = $criterion.benchmark_group("encode");
+        $(
+            group.bench_function($id, |b| {
+                b.iter(|| {
+                    let _ = black_box(encode($hash, $input).unwrap());
+                })
+            });
+        )*
+        group.finish();
+    }};
+}
+
+fn bench_encode(c: &mut Criterion) {
+    let mut rng = rand::thread_rng();
+    let data: Vec<u8> = (0..1024).map(|_| rng.gen()).collect();
+    group_encode!(c,
+        "identity" => Hash::Identity, &data
+        "sha1" => Hash::SHA1, &data
+        "sha2_256" => Hash::SHA2256, &data
+        "sha2_512" => Hash::SHA2512, &data
+        "sha3_224" => Hash::SHA3224, &data
+        "sha3_256" => Hash::SHA3256, &data
+        "sha3_384" => Hash::SHA3384, &data
+        "keccak_224" => Hash::Keccak224, &data
+        "keccak_256" => Hash::Keccak256, &data
+        "keccak_384" => Hash::Keccak384, &data
+        "keccak_512" => Hash::Keccak512, &data
+        "blake2b_256" => Hash::Blake2b256, &data
+        "blake2b_512" => Hash::Blake2b512, &data
+        "blake2s_128" => Hash::Blake2s128, &data
+        "blake2s_256" => Hash::Blake2s256, &data
+    );
+}
+
+criterion_group!(benches, bench_encode);
+criterion_main!(benches);