spki: bench SubjectPublicKeyInfoRef (#1947)

Author: dishmaker

spki/benches/mod.rs

@@ -0,0 +1,32 @@
+#![feature(test)]
+#![cfg(feature = "alloc")]
+
+extern crate test;
+
+use spki::SubjectPublicKeyInfoRef;
+use test::{Bencher, black_box};
+
+/// Ed25519 `SubjectPublicKeyInfo` encoded as ASN.1 DER
+const ED25519_DER_EXAMPLE: &[u8] = include_bytes!("../tests/examples/ed25519-pub.der");
+
+#[bench]
+fn bench_spki_decode(b: &mut Bencher) {
+    b.iter(|| {
+        let pk_encoded = black_box(ED25519_DER_EXAMPLE);
+        black_box(SubjectPublicKeyInfoRef::try_from(pk_encoded)).unwrap();
+    });
+    b.bytes = ED25519_DER_EXAMPLE.len() as u64;
+}
+
+#[bench]
+fn bench_spki_encode(b: &mut Bencher) {
+    let pk = SubjectPublicKeyInfoRef::try_from(ED25519_DER_EXAMPLE).unwrap();
+    let mut buf = [0u8; 256];
+
+    use der::Encode;
+    b.iter(|| {
+        let pk = black_box(&pk);
+        black_box(pk.encode_to_slice(&mut buf)).unwrap();
+    });
+    b.bytes = ED25519_DER_EXAMPLE.len() as u64;
+}