com.google.code.mymon3y.util.Hasher.java Source code

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Here is the source code for com.google.code.mymon3y.util.Hasher.java

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/*
 * Copyright (C) 2009
 * 
 * Jaindson Valentim Santana (jaindsonvs [at] gmail [dot] com)
 * Matheus Gaudencio do Rgo (matheusgr [at] gmail [dot] com)
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 * You may obtain a copy of the License at
 *
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */
package com.google.code.mymon3y.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.binary.Base64;

/**
 * Entidade capaz de realizar hash de strings.
 * 
 * @author Jaindson Valentim Santana
 * @author Matheus Gaudencio do Rgo
 * 
 */
public class Hasher {

    /**
     * {@link MessageDigest} responsvel por fazer os hashes das strings.
     */
    private static MessageDigest md;

    static {
        try {
            md = MessageDigest.getInstance("SHA-256");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Construtor vazio.
     */
    private Hasher() {

    }

    /**
     * Retorna o hash SHA 256 da string.
     * 
     * @param string
     *            String a ser avaliada.
     * @return O hash SHA 256 da string.
     */
    public static String getSha256(String string) {

        if (string == null || string.equals("")) {
            return string;
        }

        String senhaEncriptada = null;

        byte[] hash = md.digest(string.getBytes());
        senhaEncriptada = new String(Base64.encodeBase64(hash));

        return senhaEncriptada;
    }

}