Add get_secure_random_bytes() benchmark

Author: danielgranhao

lightning/src/chain/keysinterface.rs

@@ -1469,3 +1469,26 @@ impl PhantomKeysManager {
 pub fn dyn_sign() {
 	let _signer: Box<dyn EcdsaChannelSigner>;
 }
+
+#[cfg(all(test, feature = "_bench_unstable", not(feature = "no-std")))]
+mod benches {
+	use std::time::Duration;
+	use bitcoin::blockdata::constants::genesis_block;
+	use bitcoin::Network;
+	use crate::chain::keysinterface::{EntropySource, KeysManager};
+
+	use test::Bencher;
+
+	#[bench]
+	fn bench_get_secure_random_bytes(bench: &mut Bencher) {
+		let seed = [0u8; 32];
+		let now = Duration::from_secs(genesis_block(Network::Testnet).header.time as u64);
+		let keys_manager = KeysManager::new(&seed, now.as_secs(), now.subsec_micros());
+		bench.iter(|| {
+			for _ in 1..100 {
+				keys_manager.get_secure_random_bytes();
+			}
+		})
+	}
+
+}