package com.chauvet.utils;

import java.security.NoSuchAlgorithmException;

import java.util.Random;

/***

* MD5

* @author WXW

*

*/

public class MD5Util {

private final String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";

private final String ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxwangxiaowei";

private static String key = "myNameIsChauvet20160824";// 盐

/**

* 加密部分 加盐

* @param txt

* @param key

* @return

*/

public String encrypt(String txt,String key){

Random random = new Random();

int nh1 = Math.abs(random.nextInt(64));

int nh2 = Math.abs(random.nextInt(64));

int nh3 = Math.abs(random.nextInt(64));

char ch1 = chars.toCharArray()[nh1];

char ch2 = chars.toCharArray()[nh2];

char ch3 = chars.toCharArray()[nh3];

int nhnum = nh1 + nh2 + nh3;

int knum = 0;

for(int i=0;i<key.length();i++)

knum +=(int)key.toCharArray()[i];

String mdKey = null;

try {

mdKey = MD5.MD5Encode(MD5.MD5Encode(MD5.MD5Encode(key+ch1)+ch2+ikey)+ch3).substring((int)(nhnum%8),(int)(nhnum%8)+(int)(knum%8 + 16));

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

txt = BaseUtil.Base64Encode(txt);

txt = txt.replace('+','-');txt = txt.replace('/','_');txt = txt.replace('=','.');

String tmp = "";

int j=0;int k = 0;

int tlen = txt.length();

int klen = mdKey.length();

for (int i=0; i<tlen; i++) {

k = k == klen ? 0 : k;

j = (nhnum+chars.indexOf(txt.toCharArray()[i])+((int)(mdKey.toCharArray()[k++])))%64;

tmp += chars.toCharArray()[j];

}

int tmplen = tmp.length();

StringBuffer br = new StringBuffer();

br.append(tmp);

br.insert(nh2 % ++tmplen, ch3);

tmp = br.toString();

StringBuffer br2 = new StringBuffer();

br2.append(tmp);

br2.insert(nh1 % ++tmplen, ch2);

tmp = br2.toString();

StringBuffer br3 = new StringBuffer();

br3.append(tmp);

br3.insert(knum % ++tmplen, ch1);

tmp = br3.toString();

return tmp;

}

/**

* 解密部分

* @param txt

* @param key

* @return

*/

public String decrypt(String txt,String key){

int knum = 0;

int tlen = txt.length();

for(int i=0;i<key.length();i++)

knum +=(int)key.toCharArray()[i];

char ch1 = txt.toCharArray()[knum % tlen];

int nh1 = chars.indexOf(ch1); 

StringBuffer br = new StringBuffer();

br.append(txt);

int ttt1 = knum % tlen--;

txt = br.replace(ttt1, ttt1+1, "").toString();

char ch2 = txt.toCharArray()[nh1 % tlen];

int nh2 = chars.indexOf(ch2);

StringBuffer br2 = new StringBuffer();

br2.append(txt);

int ttt2 = nh1 % tlen--;

txt = br2.replace(ttt2, ttt2+1, "").toString();

char ch3 = txt.toCharArray()[nh2 % tlen];

int nh3 = chars.indexOf(ch3);

StringBuffer br3 = new StringBuffer();

br3.append(txt);

int ttt3 = nh2 % tlen--;

txt = br3.replace(ttt3, ttt3+1, "").toString();

int nhnum = nh1 + nh2 + nh3;

String mdKey = null;

try {

mdKey = MD5.MD5Encode(MD5.MD5Encode(MD5.MD5Encode(key+ch1)+ch2+ikey)+ch3).substring((int)(nhnum % 8),(int)(nhnum % 8)+(int)(knum % 8 + 16));

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

String tmp = "";

int j=0; int k = 0;

tlen = txt.length();

int klen = mdKey.length();

for (int i=0; i<tlen; i++) {

k = k == klen ? 0 : k;

j = chars.indexOf(txt.toCharArray()[i])-nhnum - ((int)(mdKey.toCharArray()[k++]));

while (j<0)

j+=64;

tmp += chars.toCharArray()[j];

}

tmp = tmp.replace('-','+');tmp = tmp.replace('_','/');tmp = tmp.replace('.','=');

tmp = BaseUtil.Base64Decode(tmp);

tmp = tmp.replace((char)0, ' ').replace(" ", "");

return tmp;

}

public static void main(String[] args) {

String a = new MD5Util().encrypt("wxw@chauvet.2016", key);

System.out.println(a);

String b = new MD5Util().decrypt("HvLV0ICDQNP_fUON5pDdqcp3d48", key);

System.out.println(b);

}

}