src/main/java/CryptoBench.java

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.TimeUnit;

public class CryptoBench {

	private static final boolean trackTime = Boolean.getBoolean("trackTime");
	
	public static void main(String[] args) {
		CryptoBench test = new CryptoBench();
		while(true) {
			test.execute();
		}		
	}
	
	public void execute() {
        long N = 5 * 1000 * 1000;
        RandomStringUtils randomStringUtils = new RandomStringUtils();
        long ts = 0,tf = 0;
        long timer1 = 0;
        long timer2 = 0;
        long bs = System.nanoTime();
        for (long i = 0; i < N; i++) {
        	ts = trackTime ? System.nanoTime() : 0;
            String text = randomStringUtils.generate();
            tf = trackTime ? System.nanoTime() : 0;
            timer1 += tf - ts;
            ts = tf;
			crypt(text);
			tf = trackTime ? System.nanoTime() : 0;
			timer2 += tf - ts;
			ts = tf;
        }
        long bt = System.nanoTime() - bs;
        System.out.print(String.format("Hash rate: %.2f Mm/s", 0.01 * (N * TimeUnit.SECONDS.toNanos(1) / bt / 10000)));
        if (trackTime) {
	        System.out.print(String.format(" | Generation: %.1f %%",  0.1 * (1000 * timer1 / (timer1 + timer2))));
	        System.out.print(String.format(" | Hasing: %.1f %%", 0.1 * (1000 * timer2 / (timer1 + timer2))));
        }
        System.out.println();
	}

    public String crypt(String str) {
        if (str == null || str.length() == 0) {
            throw new IllegalArgumentException("String to encript cannot be null or zero length");
        }
        StringBuilder hexString = new StringBuilder();
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte[] hash = md.digest();
            for (byte aHash : hash) {
                if ((0xff & aHash) < 0x10) {
                    hexString.append("0" + Integer.toHexString((0xFF & aHash)));
                } else {
                    hexString.append(Integer.toHexString(0xFF & aHash));
                }
            }
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return hexString.toString();
    }
}