package com.mm.android.deviceaddmodule.openapi;

import java.io.File;
import java.io.FileInputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created by Tong on 2021/11/3.
 */
public final class HDLMD5Utils {

    /**
     * MD5转字符串
     */
    public static String encodeMD5(String s) {
        try {
            MessageDigest digest = MessageDigest.getInstance("MD5");
            digest.update(s.getBytes("UTF-8"));
            byte[] messageDigest = digest.digest();
            return toHexString(messageDigest);
        } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return "";
    }

    private static String toHexString(byte[] keyData) {
        if (keyData == null) {
            return null;
        }
        int expectedStringLen = keyData.length * 2;
        StringBuilder sb = new StringBuilder(expectedStringLen);
        for (byte keyDatum : keyData) {
            String hexStr = Integer.toString(keyDatum & 0x00FF, 16);
            if (hexStr.length() == 1) {
                hexStr = "0" + hexStr;
            }
            sb.append(hexStr);
        }
        return sb.toString();
    }

    /**
     * MD5转字符串
     * 额外值
     */
    public static String encodeMD52(String s) {
        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        try {
            byte[] btInput = s.getBytes("utf-8");
            MessageDigest digest = MessageDigest.getInstance("MD5");
            digest.update(btInput);
            byte[] md = digest.digest();
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (byte byte0 : md) {
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * MD5文件转字符串
     */
    public static String encodeMD5(File f) {
        if (!f.isFile()) {
            return null;
        }
        MessageDigest digest;
        byte[] buffer = new byte[1024];
        int len;
        try {
            digest = MessageDigest.getInstance("MD5");
            FileInputStream in = new FileInputStream(f);
            while ((len = in.read(buffer, 0, 1024)) != -1) {
                digest.update(buffer, 0, len);
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    }

    /**
     * MD5文件转字符串
     */
    public static String encodeMD5(byte[] f) {
        MessageDigest digest;
        try {
            digest = MessageDigest.getInstance("MD5");
            digest.update(f);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    }



    public final static String md5(String plainText) {

// 返回字符串

        String md5Str = null;

        try {

// 操作字符串

            StringBuffer buf = new StringBuffer();

            MessageDigest md =

                    MessageDigest.getInstance("MD5");

// 添加要进行计算摘要的信息,使用 plainText 的 byte


            md.update(plainText.getBytes());

// 计算出摘要,完成哈希计算。

            byte b[] = md.digest();

            int i;

            for (int offset = 0; offset < b.length; offset++) {

                i = b[offset];

                if (i < 0) {

                    i += 256;

                }

                if (i < 16) {

                    buf.append("0");

                }

// 将整型 十进制 i


                buf.append(Integer.toHexString(i));

            }

// 32位的加密

            md5Str = buf.toString();

// 16位的加密

// md5Str =  buf.toString().md5Strstring(8,24);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return md5Str;

    }


}