package com..utils;
import java.security.MessageDigest;
public class MD5Util {
/***
* MD5加码 生成32位md5码
*/
public static String string2MD5(String inStr) {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
System.out.println(e.toString());
e.printStackTrace();
return "";
}
char[] charArray = inStr.toCharArray();
byte[] byteArray = new byte[charArray.length];
for (int i = 0; i < charArray.length; i++) {
byteArray[i] = (byte) charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16){
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
/**
* 加密解密算法 执行一次加密，两次解密
*/
public static String convertMD5(String inStr) {
char[] a = inStr.toCharArray();
for (int i = 0; i < a.length; i++) {
a[i] = (char) (a[i] ^ 't');
}
String s = new String(a);
return s;
}
// 测试主函数
public static void main(String args[]) {
String s = "sql: select * from syn_data_db_config";
System.out.println("原始：" + s);
System.out.println("MD5后：" + string2MD5(s));
System.out.println("加密的：" + convertMD5(s));
System.out.println("解密的：" + convertMD5(convertMD5(s)));
String ss="加密的sql";
System.out.println("ss原始：" + ss);
System.out.println("ssMD5后：" + string2MD5(ss));
System.out.println("ss加密的：" + convertMD5(ss));
System.out.println("ss解密的：" + convertMD5(convertMD5(ss)));
System.out.println("ss解密的：" + convertMD5(ss));
}
}
