rand benchmarks

Cargo.toml

@@ -5,6 +5,9 @@ members = [
     "example_parsing",
 ]
 
+[profile.bench]
+debug = true
+
 [workspace.dependencies]
 anyhow = "1"
 clap = { version = "4", features = ["derive"] }

example_crypto/Cargo.toml

@@ -10,6 +10,10 @@ publish = false
 name = "keygen"
 harness = false
 
+[[bench]]
+name = "rand"
+harness = false
+
 [[bench]]
 name = "sign"
 harness = false

example_crypto/benches/rand.rs

@@ -0,0 +1,39 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use rand::{thread_rng, RngCore};
+
+fn bench_rand_thread_rng(c: &mut Criterion) {
+    // stack tests
+    c.bench_function("rand::thread_rng::stack_32", |b| {
+        b.iter(|| {
+            let mut s = [0; 32];
+            thread_rng().fill_bytes(&mut s);
+        })
+    });
+    c.bench_function("rand::thread_rng::stack_64", |b| {
+        b.iter(|| {
+            let mut s = [0; 64];
+            thread_rng().fill_bytes(&mut s);
+        })
+    });
+    // vec tests
+    c.bench_function("rand::thread_rng::alloc_32", |b| {
+        b.iter(|| {
+            let mut v = vec![0; 32];
+            thread_rng().fill_bytes(&mut v.as_mut_slice());
+        })
+    });
+    c.bench_function("rand::thread_rng::alloc_64", |b| {
+        b.iter(|| {
+            let mut v = vec![0; 64];
+            thread_rng().fill_bytes(&mut v.as_mut_slice());
+        })
+    });
+}
+
+criterion_group! {
+    name = rand;
+    config = Criterion::default();
+    targets = bench_rand_thread_rng
+}
+
+criterion_main!(rand);