Tidied up example/static test executables

GCryptLib/exec/Benchmark.h

@@ -0,0 +1,23 @@
+#ifndef GCRYPTEXAMPLE_BENCHMARK_H
+#define GCRYPTEXAMPLE_BENCHMARK_H
+
+#include <functional>
+#include <chrono>
+#include <iostream>
+
+void Benchmark(const std::string& brief, std::function<void()> toBenchmark) {
+  std::cout << "Benchmarking " << brief << "..." << std::endl;
+
+  auto start = std::chrono::steady_clock::now();
+
+  toBenchmark();
+
+  auto end = std::chrono::steady_clock::now();
+  double seconds = (double)std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count() / 1000.0;
+  std::cout << seconds << " seconds." << std::endl << std::endl;
+
+  return;
+}
+
+#endif
+