Sample code showing how to use SHA-512 hash (Well, it's fully standard).

Sha512Test.java

package net.batmat.testsha512;
import static junit.framework.Assert.assertEquals;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;

import org.junit.Test;

public class SHA512Test
{
	@Test
	public void testHash512() throws NoSuchAlgorithmException
	{
		// petite liste générée avec la commande echo -n "texte" | sha512sum sous Linux
		Map<String, String> exemples = new HashMap<String, String>();
		exemples
				.put(
						"le mot de passe",
						"b2dacb1654eb1fb49f605f5fb97d06d973ac1a499934e3abdec113f8aecc1fd4280f56cfb679cc0ae4d9153f0b8eb68ac683cdaca3a8bf6b4c436bec4ced7cde");
		exemples
				.put(
						"bonjour",
						"3041edbcdd46190c0acc504ed195f8a90129efcab173a7b9ac4646b92d04cc80005acaa3554f4b1df839eacadc2491cb623bf3aa6f9eb44f6ea8ca005821d25d");

		MessageDigest md = MessageDigest.getInstance("SHA-512");
		for (Map.Entry<String, String> entry : exemples.entrySet())
		{
			byte[] digest = md.digest(entry.getKey().getBytes());

			assertEquals(entry.getValue(), String.format("%0128x", new BigInteger(1, digest)));
		}
	}
}