package com.shlanbao.tzsc.utils.tools;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* MD5加密工具类
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* <li>@author Leejean
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* <li>@create 2014-6-24 下午04:13:41
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*
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* @author zhuguifei
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* @update 2019-06-03
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* @desc 添加SHA256加密
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*/
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public class MD5Util {
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public static void main(String[] args) {
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String s = "lanbaoit";
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System.out.println(md5(s));
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System.out.println("SHA256:" + SHA256(s));
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}
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/**
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* md5加密
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*
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* @param str
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* @return
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*/
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public static String md5(String str) {
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try {
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MessageDigest md = MessageDigest.getInstance("MD5");
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md.update(str.getBytes());
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byte[] byteDigest = md.digest();
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int i;
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StringBuffer buf = new StringBuffer("");
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for (int offset = 0; offset < byteDigest.length; offset++) {
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i = byteDigest[offset];
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if (i < 0)
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i += 256;
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if (i < 16)
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buf.append("0");
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buf.append(Integer.toHexString(i));
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}
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// 32位加密
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//return buf.toString();
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// 16位的加密
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return buf.toString().substring(8, 24);
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* 传入文本内容，返回 SHA-256 串
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*
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* @param strText
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* @return
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*/
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public static String SHA256(final String strText) {
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return SHA(strText, "MD5");
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}
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/**
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* 传入文本内容，返回 SHA-512 串
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*
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* @param strText
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* @return
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*/
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public static String SHA512(final String strText) {
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return SHA(strText, "SHA-512");
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}
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/**
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* 字符串 SHA 加密
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*
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* @param
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* @return
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*/
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private static String SHA(final String strText, final String strType) {
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// 返回值
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String strResult = null;
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// 是否是有效字符串
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if (strText != null && strText.length() > 0) {
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try {
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// SHA 加密开始
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// 创建加密对象 并傳入加密類型
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MessageDigest messageDigest = MessageDigest
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.getInstance(strType);
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// 传入要加密的字符串
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messageDigest.update(strText.getBytes());
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byte byteBuffer[] = messageDigest.digest();
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StringBuffer strHexString = new StringBuffer();
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// 遍歷 byte buffer
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for (int i = 0; i < byteBuffer.length; i++) {
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String hex = Integer.toHexString(0xff & byteBuffer[i]);
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if (hex.length() == 1) {
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strHexString.append('0');
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}
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strHexString.append(hex);
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}
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// 得到返回結果
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strResult = strHexString.toString();
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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}
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}
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return strResult;
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}
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}
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