Benchmark random scalar generation compared to prev version

Signed-off-by: Denis Varlakov <denis@dfns.co>

Author: survived

Cargo.lock

@@ -10,6 +10,8 @@ publish = false
 generic-ec = { path = "../generic-ec", default-features = false, features = ["all-curves", "serde"] }
 generic-ec-zkp = { path = "../generic-ec-zkp", default-features = false, features = ["serde", "udigest"] }
 
+generic-ec-v04 = { package = "generic-ec", version = "0.4.5", default-features = false, features = ["all-curves"] }
+
 plotters = "0.3"
 anyhow = "1"
 regex = "1.10"
@@ -37,3 +39,7 @@ default = ["generic-ec/std"]
 name = "multiscalar"
 harness = false
 
+[[bench]]
+name = "random"
+harness = false
+

tests/Cargo.toml

@@ -0,0 +1,28 @@
+use generic_ec::curves;
+use generic_ec_v04::curves as curves_v04;
+
+criterion::criterion_main!(benches);
+criterion::criterion_group!(benches, random);
+
+fn random(c: &mut criterion::Criterion) {
+    let mut rng = rand_dev::DevRng::new();
+
+    random_for_curve::<curves::Secp256k1, curves_v04::Secp256k1>(c, &mut rng, "secp256k1");
+    random_for_curve::<curves::Secp256r1, curves_v04::Secp256r1>(c, &mut rng, "secp256r1");
+    random_for_curve::<curves::Stark, curves_v04::Stark>(c, &mut rng, "stark");
+    random_for_curve::<curves::Ed25519, curves_v04::Ed25519>(c, &mut rng, "ed25519");
+}
+
+fn random_for_curve<E: generic_ec::Curve, E04: generic_ec_v04::Curve>(
+    c: &mut criterion::Criterion,
+    rng: &mut impl rand::RngCore,
+    curve_name: &str,
+) {
+    let mut g = c.benchmark_group(format!("random/{curve_name}"));
+    g.bench_function("v04", |b| {
+        b.iter(|| generic_ec_v04::Scalar::<E04>::random(rng))
+    });
+    g.bench_function("latest", |b| {
+        b.iter(|| generic_ec::Scalar::<E>::random(rng))
+    });
+}