[网络协议]使用PBEWITHMD5andDES进行秘钥以及随机加盐加密

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.util.Base64;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import org.apache.commons.lang.StringUtils;

public class Mintest {

public static void main(String... args) throws Exception {
	Mintest mintest=new Mintest();
	String original = "Let’s Build a Giant Airship 青海长云暗雪山";
    System.out.println("原文:"+original);
    try {
    	String miWen=mintest.encryption(original);
    	System.out.println("密文:"+miWen);
    	String msg=mintest.unEncryption(miWen);
    	System.out.println("明文:"+msg);
    }catch(Exception e) {
    	e.printStackTrace();
    }
}

public String unEncryption(String miwen) throws NoSuchAlgorithmException, InvalidKeySpecException, 
	NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, 
	IllegalBlockSizeException, BadPaddingException {
	Key key=getKey();
	String realMiWen=StringUtils.substring(miwen,0,StringUtils.lastIndexOf(miwen, "?"));
	System.out.println("realMiWen:"+realMiWen);
	String salt=StringUtils.substring(miwen,StringUtils.lastIndexOf(miwen, "?")+1);
	System.out.println("salt:"+salt);
	PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(Base64.getDecoder().decode(salt), 100);
	byte[] bytes = Base64.getDecoder().decode(realMiWen);
	Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
	// 解密
	cipher.init(Cipher.DECRYPT_MODE, key, pbeParameterSpec);
	bytes = cipher.doFinal(bytes);
	String mingWen=new String(bytes);
	System.out.println("解密："+mingWen);
	return mingWen;
}

public String encryption(String message) throws NoSuchAlgorithmException, NoSuchPaddingException, 
	InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, 
	BadPaddingException, InvalidKeySpecException {
	Key key=getKey();
	String salt=getSalt();
	PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(Base64.getDecoder().decode(salt), 100);
	// 加密
	Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
	cipher.init(Cipher.ENCRYPT_MODE, key, pbeParameterSpec);
	byte[] bytes = cipher.doFinal(message.getBytes());
	String miwen=Base64.getEncoder().encodeToString(bytes)+"?"+salt;
	System.out.println("密文:" + miwen);
	return miwen;
}

private String getSalt() {
	// 初始化盐
	SecureRandom random = new SecureRandom();
	byte[] salt = random.generateSeed(8);
	return Base64.getEncoder().encodeToString(salt);
}

private Key getKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
	// 生产密钥
	String password = "haha168";// 口令
	PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
	SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
	Key key = factory.generateSecret(pbeKeySpec);// 密钥，下面加密解密都要用到
	System.out.println("密钥:" +new String(key.getEncoded()));
	return key;
}

}