RandomSpeedTest.java

package com.u7.test;

import com.u7.util.*;

import java.security.*;
import java.util.*;

public class RandomSpeedTest
{
	static int seed = 1234;

	public static void main(final String[] args)
	{
		gg.sleepSeconds(2);

		speedTest("Regular Random", new Runnable()
		{
			@Override
			public void run()
			{
				Random r = new Random(seed++);

				byte [] b = new byte[64];

				r.nextBytes(b);
			}
		});

		speedTest("SecureRandom.getInstanceStrong", new Runnable()
		{
			@Override
			public void run()
			{
				Random r = null;
				try
				{
					r = SecureRandom.getInstanceStrong();
				}
				catch(NoSuchAlgorithmException e)
				{
					throw new Error(e);
				}

				byte [] b = new byte[64];

				r.nextBytes(b);
			}
		});

		speedTest("SecureRandom.getInstance(\"SHA1PRNG\")", new Runnable()
		{
			@Override
			public void run()
			{
				Random r = null;
				try
				{
					r = SecureRandom.getInstance("SHA1PRNG");
					r.setSeed(seed++);
				}
				catch(NoSuchAlgorithmException e)
				{
					throw new Error(e);
				}

				byte [] b = new byte[64];

				r.nextBytes(b);
			}
		});
	}

	private static void speedTest(final String msg, final Runnable r)
	{
		int n = 10;

		p("About to test: " + msg);
		Stopwatch s = new Stopwatch(true);

		for(int i = 0; i < n; ++i)
		{
			r.run();
		}

		p("Test complete for " + msg);
		p(s.generateReport(n));
		p("");
	}

	public static void p(String s)
	{
		System.out.println(s);
		System.out.flush();
	}
}