package net.sourceforge.fenixedu.util;

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

public class SecurityUtils {

    public static byte[] getMD5Bytes(byte[] data) {
        try {
            MessageDigest md5Digest = MessageDigest.getInstance("MD5");

            return md5Digest.digest(data);
        } catch (NoSuchAlgorithmException nsae) {
            throw new RuntimeException();
        }
    }

    public static String getMD5String(byte[] data) {
        return convertToHex(getMD5Bytes(data));
    }

    private static String convertToHex(byte[] data) {
        StringBuilder result = new StringBuilder();

        for (int i = 0; i < data.length; i++) {
            int low = (int) (data[i] & 0x0F);
            int high = (int) (data[i] & 0xF0);

            result.append(Integer.toHexString(high).substring(0, 1));
            result.append(Integer.toHexString(low));
        }

        return result.toString();
    }

}