package com.yale.test.ps.md5;

import java.security.MessageDigest;

/*

* 一文让你轻松了解 JAVA 开发中的四种加密方法

* https://zhuanlan.zhihu.com/p/93860175

* 芋道源码

*/

public class MD5Demo {

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

public static String MD5Encode(String origin, String charsetname) {

String resultString = null;

try {

resultString = new String(origin);

MessageDigest md = MessageDigest.getInstance("MD5");

if (null == charsetname || "".equals(charsetname)) {

resultString = byteArrayToHexString(md.digest(resultString.getBytes()));

} else {

resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));

}

} catch (Exception e) {

e.printStackTrace();

}

return resultString;

}

public static String byteArrayToHexString(byte[] b) {

StringBuilder result = new StringBuilder();

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

result.append(byteToHexString(b[i]));

}

return result.toString();

}

public static String byteToHexString(byte b) {

int n = b;

if (n <0) {

n +=256;

}

int d1 = n / 126;

int d2 = n % 16;

return hexDigIts[d1] + hexDigIts[d2];

}

public static void main(String[] args) {

System.out.println(MD5Demo.MD5Encode("ABC", "UTF-8"));

}

}