QEncodeUtil.java

package com.luckin.stock.utils;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import com.luckin.stock.utils.CalendarTools;
import com.luckin.stock.utils.StringTools;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;


/**
 * 编码工具类
 * 1.将byte[]转为各种进制的字符串
 * 2.base 64 encode
 * 3.base 64 decode
 * 4.获取byte[]的md5值
 * 5.获取字符串md5值
 * 6.结合base64实现md5加密
 * 7.AES加密
 * 8.AES加密为base 64 code
 * 9.AES解密
 * 10.将base 64 code AES解密
 * @author uikoo9
 * @version 0.0.7.20140601
 */
public class QEncodeUtil {
	
	final static String key = "cainiu_luckin";
	
	public static void main(String[] args) throws Exception {
		String userName = "cainiu|"+CalendarTools.getNowDateTime();
		System.out.println("加密前：" + userName);

//		String key = "123456";
//		System.out.println("加密密钥和解密密钥：" + key);
		
		String encrypt = aesEncrypt(userName);
		System.out.println("加密后：" + encrypt);
		
		String decrypt = aesDecrypt(encrypt);
		System.out.println("解密后：" + decrypt);
	}
	
	/**
	 * 将byte[]转为各种进制的字符串
	 * @param bytes byte[]
	 * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
	 * @return 转换后的字符串
	 */
	public static String binary(byte[] bytes, int radix){
		return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
	}
	
	/**
	 * base 64 encode
	 * @param bytes 待编码的byte[]
	 * @return 编码后的base 64 code
	 */
	public static String base64Encode(byte[] bytes){
		return new BASE64Encoder().encode(bytes);
	}
	
	/**
	 * base 64 decode
	 * @param base64Code 待解码的base 64 code
	 * @return 解码后的byte[]
	 * @throws Exception
	 */
	public static byte[] base64Decode(String base64Code) throws Exception{
		return StringTools.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
	}
	
	/**
	 * 获取byte[]的md5值
	 * @param bytes byte[]
	 * @return md5
	 * @throws Exception
	 */
	public static byte[] md5(byte[] bytes) throws Exception {
		MessageDigest md = MessageDigest.getInstance("MD5");
		md.update(bytes);
		
		return md.digest();
	}
	
	/**
	 * 获取字符串md5值
	 * @param msg 
	 * @return md5
	 * @throws Exception
	 */
	public static byte[] md5(String msg) throws Exception {
		return StringTools.isEmpty(msg) ? null : md5(msg.getBytes());
	}
	
	/**
	 * 结合base64实现md5加密
	 * @param msg 待加密字符串
	 * @return 获取md5后转为base64
	 * @throws Exception
	 */
	public static String md5Encrypt(String msg) throws Exception{
		return StringTools.isEmpty(msg) ? null : base64Encode(md5(msg));
	}
	
	/**
	 * AES加密
	 * @param content 待加密的内容
	 * @param encryptKey 加密密钥
	 * @return 加密后的byte[]
	 * @throws Exception
	 */
	public static byte[] aesEncryptToBytes(String content) throws Exception {
		KeyGenerator kgen = KeyGenerator.getInstance("AES");
		kgen.init(128, new SecureRandom(key.getBytes()));

		Cipher cipher = Cipher.getInstance("AES");
		cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
		
		return cipher.doFinal(content.getBytes("utf-8"));
	}
	
	/**
	 * AES加密为base 64 code
	 * @param content 待加密的内容
	 * @param encryptKey 加密密钥
	 * @return 加密后的base 64 code
	 * @throws Exception
	 */
	public static String aesEncrypt(String content) throws Exception {
		return base64Encode(aesEncryptToBytes(content));
	}
	
	/**
	 * AES解密
	 * @param encryptBytes 待解密的byte[]
	 * @param decryptKey 解密密钥
	 * @return 解密后的String
	 * @throws Exception
	 */
	public static String aesDecryptByBytes(byte[] encryptBytes) throws Exception {
		KeyGenerator kgen = KeyGenerator.getInstance("AES");
		kgen.init(128, new SecureRandom(key.getBytes()));
		
		Cipher cipher = Cipher.getInstance("AES");
		cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
		byte[] decryptBytes = cipher.doFinal(encryptBytes);
		
		return new String(decryptBytes);
	}
	
	
	/**
	 * 将base 64 code AES解密
	 * @param encryptStr 待解密的base 64 code
	 * @param decryptKey 解密密钥
	 * @return 解密后的string
	 * @throws Exception
	 */
	public static String aesDecrypt(String encryptStr) throws Exception {
		return StringTools.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr));
	}
	
/*	public static String  decode(){
		try {
			String keyStr="abcdefgh";
			String data="xxxxxx";
			SecretKey key=new SecretKeySpec(keyStr.getBytes(), "DES");
			Cipher cipher=Cipher.getInstance(key.getAlgorithm());
			byte[]b=null;
				cipher.init(Cipher.ENCRYPT_MODE, key);
				b=cipher.doFinal(data.getBytes());
			//	return new BASE64Encoder().encode(b);
				
				
				cipher.init(Cipher.DECRYPT_MODE, key);
				b =cipher.doFinal(b);
				new String(b);
		} catch (Exception e) {
		}
		
	}*/
}