import java.util.Random;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.PBEKeySpec;import javax.crypto.spec.PBEParameterSpec;public class Token {/** 基于口令加密創(chuàng)建步驟* 1、讀取口令* 將需加密字符串轉(zhuǎn)化為字符數(shù)組* 將口令保存至PBEKeySpec對象中* 2、由口令生成秘鑰* 通過SecretKeyfactory工廠類的getInstance靜態(tài)方法獲取SecretKeyFactory對象；* getInstance方法需要一個(gè)參數(shù)--指定口令加密算法{* 1、PBEWithMD5AndDES* 2、PBEWithHmacSHA1AndDESede}* 通過SecretKeyFactory工廠類的generateSecret()方法生成秘鑰* 3、生成隨機(jī)數(shù)（鹽）* 鹽必須是8個(gè)元素的字節(jié)數(shù)組* 通過Random類的nextbyte方法生成隨機(jī)數(shù)并將隨機(jī)數(shù)賦值給byte數(shù)組，參數(shù)為byte數(shù)組* 4、創(chuàng)建并初始化密碼器* 通過getInstance方法獲取密碼器對象，參數(shù)為基于口令的加密算法* 通過PBEParameterSpec類構(gòu)造器向Cipher對象指定基于口令加密的算法（包括提高破解難度的鹽）* 5、獲取明文，進(jìn)行加密* 執(zhí)行密碼器的doFinal（）方法進(jìn)行加密，加密結(jié)果保存在字節(jié)數(shù)組ctext中* *///口令加密操作方法public byte[] cmdEncryptionOperation(String encryptionStr,String pwdStr) throws Exception{//讀取口令//將口令轉(zhuǎn)化為字符數(shù)組char[] pwd = pwdStr.toCharArray();//將加密數(shù)組存儲(chǔ)至PBEKeySpec對象PBEKeySpec pbeKeySpec = new PBEKeySpec(pwd);//由口令生成秘鑰//通過SecretKeyFactory的getinstance方法創(chuàng)建SecretKeyFactory對象，構(gòu)造參數(shù)為加密類型SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");//拋出沒找到關(guān)鍵字異常//通過generateSecret生成口令SecretKey key = secretKeyFactory.generateSecret(pbeKeySpec);//生成隨機(jī)數(shù)（鹽）// 創(chuàng)建是8個(gè)元素的字節(jié)數(shù)組的鹽byte[] salt = new byte[8];//通過Random類的nextbyte方法生成隨機(jī)數(shù)并將隨機(jī)數(shù)賦值給byte數(shù)組，參數(shù)為byte數(shù)組Random random = new Random();random.nextBytes(salt);//創(chuàng)建并初始化密碼器Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, 1000);cipher.init(Cipher.ENCRYPT_MODE, key,parameterSpec);//獲取明文，進(jìn)行加密byte[] ptext = encryptionStr.getBytes("UTF-8");byte[] ctext = cipher.doFinal(ptext);//cipher的dofinal方法進(jìn)行加密return ctext;}}

public static void main(String[] args) throws Exception {Token token = new Token();byte[] ctext = token.cmdEncryptionOperation("加QQ群 499092562交流！！","2016/4/5");FileOutputStream os = new FileOutputStream("PBEEnc.dat");os.write(ctext);for (int i = 0; i < ctext.length; i++) {System.out.print(ctext[i]);}}