package com.donkingliang.imageselector.utils;

import java.security.MessageDigest;

/**
 * @Author teach liang
 * @Description MD5工具类
 * @Date 2019/1/2
 */
public class MD5Utils {

    private static final String HEX_DIGITS[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    public static String md5(String s) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] bytes = md.digest(s.getBytes("utf-8"));
            return toHex(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private static String toHex(byte[] bytes) {
        StringBuilder ret = new StringBuilder(bytes.length * 2);
        for (int i = 0; i < bytes.length; i++) {
            ret.append(HEX_DIGITS[(bytes[i] >> 4) & 0x0f]);
            ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
        }
        return ret.toString();
    }

}