Port all benchmarks to Criterion

benches/signature.rs

@@ -1,12 +1,20 @@
-#![feature(test)]
+#[macro_use]
+extern crate criterion;
 extern crate solana;
-extern crate test;
 
+use criterion::{Bencher, Criterion};
 use solana::signature::GenKeys;
-use test::Bencher;
 
-#[bench]
 fn bench_gen_keys(b: &mut Bencher) {
     let rnd = GenKeys::new([0u8; 32]);
     b.iter(|| rnd.gen_n_keypairs(1000));
 }
+
+fn bench(criterion: &mut Criterion) {
+    criterion.bench_function("bench_gen_keys", |bencher| {
+        bench_gen_keys(bencher);
+    });
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);