package net.curisit.securis.utils;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class LicUtils {

	private static final Logger LOG = LogManager.getLogger(LicUtils.class);

	public static String md5(String str) {
		try {
			MessageDigest mDigest = MessageDigest.getInstance("MD5");
			mDigest.update(str.getBytes(), 0, str.length());
			BigInteger i = new BigInteger(1, mDigest.digest());
			return String.format("%1$032x", i);
		} catch (NoSuchAlgorithmException e) {
			LOG.error("Error generating MD5 for string: " + str, e);
		}
		return null;
	}

	public static String sha256(String str) {
		return sha256(str.getBytes());
	}

	public static String sha256(byte[] bytes) {
		try {
			MessageDigest mDigest = MessageDigest.getInstance("SHA-256");
			mDigest.update(bytes, 0, bytes.length);
			BigInteger i = new BigInteger(1, mDigest.digest());
			return String.format("%1$064x", i);
		} catch (NoSuchAlgorithmException e) {
			LOG.error("Error generating SHA-256 for bytes: " + bytes, e);
		}
		return null;
	}

	public static String sha256(byte[]... bytes) {
		try {
			MessageDigest mDigest = MessageDigest.getInstance("SHA-256");
			for (byte[] bs : bytes) {
				mDigest.update(bs, 0, bs.length);
			}
			BigInteger i = new BigInteger(1, mDigest.digest());
			return String.format("%1$064x", i);
		} catch (NoSuchAlgorithmException e) {
			LOG.error("Error generating SHA-256 for bytes: " + bytes, e);
		}
		return null;
	}

}