package com.nq.utils;

import cn.hutool.core.text.StrBuilder;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.util.Base64;

public class Md5Util {





    private static char sHexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    public static String getMD5(String source) {
        try {
            byte[] bytes = source.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest md = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            md.update(bytes);
            // 获得密文
            byte[] mdBytes = md.digest();
            // 把密文转换成十六进制的字符串形式
            int length = mdBytes.length;
            char[] chars = new char[length * 2];
            int k = 0;
            for (int i = 0; i < length; i++) {
                byte byte0 = mdBytes[i];
                chars[k++] = sHexDigits[byte0 >>> 4 & 0xf];
                chars[k++] = sHexDigits[byte0 & 0xf];
            }
            return new String(chars);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 加密方法
     * @param str
     * @return
     */
    public static String md5(String str) {
        return getMD5(str);
    }

    //固定盐
    private static final String salt = "30c722c6a546ss4306a93a814c9f0a";


    public static String inputStr(String inputPass) {
        String str = ""+salt.charAt(0)+salt.charAt(2) + inputPass +salt.charAt(5) + salt.charAt(4);
        System.out.println(str);
        return md5(str);
    }

    /**
     * 将用户输入的明文密码与固定盐进行拼装后再进行MD5加密
     * @param inputPass
     * @return
     */
    public static String inputPassToFormPass(String inputPass) {
        String str = ""+salt.charAt(0)+salt.charAt(2) + inputPass +salt.charAt(5) + salt.charAt(4);
        System.out.println(str);
        return md5(str);
    }

    /**
     * 将form表单中的密码转换成数据库中存储的密码
     * @param formPass
     * @param salt 随机盐
     * @return
     */
    public static String formPassToDBPass(String formPass, String salt) {
        String str = ""+salt.charAt(0)+salt.charAt(2) + formPass +salt.charAt(5) + salt.charAt(4);
        return md5(str);
    }

    public static String inputPassToDbPass(String inputPass, String saltDB) {
        String formPass = inputPassToFormPass(inputPass);
        String dbPass = formPassToDBPass(formPass, saltDB);
        return dbPass;
    }
}