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/**
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite 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
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
package org.evosuite.utils;

import java.io.File;
import java.io.IOException;
import java.math.BigInteger;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * 
 * MD5 class.
 * 
 * 
 * @author José Campos
 */
public class MD5 {

	/**
	 * Return the md5-hash of a string
	 * based on Heshan Perera @ http://stackoverflow.com/a/10530959/998816
	 * 
	 * @param s
	 * @return
	 */
	public static String hash(String s) {
		try {
			MessageDigest m = MessageDigest.getInstance("MD5");
			m.update(s.getBytes(), 0, s.length());

			BigInteger i = new BigInteger(1,m.digest());
			return String.format("%1$032x", i);
		}
		catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}

		return null;
	}

	/**
	 * Return the md5-hash of a file
	 * 
	 * @param s
	 * @return
	 */
	public static String hash(File f) {
		try {
			byte[] encoded = Files.readAllBytes(Paths.get(f.getAbsolutePath()));
			String content = new String(encoded, Charset.defaultCharset());

			return MD5.hash(content);
		}
		catch (IOException e) {
			e.printStackTrace();
		}

		return null;
	}
}