java后台怎么解密md5,Java md5 密码加解密

传入同一密钥如：key123456 进行加密解密

package com.pub;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class PwdTools{

/**

* 加密

*

* @param content

* 待加密内容

* @param key

* 加密的密钥

* @return

*/

public static String encrypt(String content,String key){

try{

KeyGenerator kgen=KeyGenerator.getInstance(“AES”);

SecureRandom secureRandom = SecureRandom.getInstance(“SHA1PRNG” );

secureRandom.setSeed(key.getBytes());

kgen.init(128,secureRandom);

SecretKey secretKey=kgen.generateKey();

byte[] enCodeFormat=secretKey.getEncoded();

SecretKeySpec secretKeySpec=new SecretKeySpec(enCodeFormat,”AES”);

Cipher cipher=Cipher.getInstance(“AES”);

byte[] byteContent=content.getBytes(“utf-8”);

cipher.init(Cipher.ENCRYPT_MODE,secretKeySpec);

byte[] byteRresult=cipher.doFinal(byteContent);

StringBuffer sb=new StringBuffer();

for(int i=0;i

md5加密，不可解密

public static String getMd5(String plainText) {

try {

MessageDigest md = MessageDigest.getInstance(“MD5”);

md.update(plainText.getBytes());

byte b[] = md.digest();

int i;

StringBuffer buf = new StringBuffer(“”);

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

i = b[offset];

if (i < 0)

i += 256;

if (i < 16)

buf.append(“0”);

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

}

//32位加密

return buf.toString();

// 16位的加密

//return buf.toString().substring(8, 24);

} catch (Exception e) {

e.printStackTrace();

return null;

}

}