package demo.security;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.util.Base64;import java.util.Scanner;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;/* * AES對(duì)稱加密和解密 */public class SymmetricEncoder { /*  * 加密  * 1.構(gòu)造密鑰生成器  * 2.根據(jù)ecnodeRules規(guī)則初始化密鑰生成器  * 3.產(chǎn)生密鑰  * 4.創(chuàng)建和初始化密碼器  * 5.內(nèi)容加密  * 6.返回字符串  */  public static String AESEncode(String encodeRules,String content){    try {      //1.構(gòu)造密鑰生成器，指定為AES算法,不區(qū)分大小寫      KeyGenerator keygen=KeyGenerator.getInstance("AES");      //2.根據(jù)ecnodeRules規(guī)則初始化密鑰生成器      //生成一個(gè)128位的隨機(jī)源,根據(jù)傳入的字節(jié)數(shù)組      keygen.init(128, new SecureRandom(encodeRules.getBytes()));       //3.產(chǎn)生原始對(duì)稱密鑰      SecretKey original_key=keygen.generateKey();       //4.獲得原始對(duì)稱密鑰的字節(jié)數(shù)組      byte [] raw=original_key.getEncoded();      //5.根據(jù)字節(jié)數(shù)組生成AES密鑰      SecretKey key=new SecretKeySpec(raw, "AES");       //6.根據(jù)指定算法AES自成密碼器      Cipher cipher=Cipher.getInstance("AES");       //7.初始化密碼器，第一個(gè)參數(shù)為加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二個(gè)參數(shù)為使用的KEY      cipher.init(Cipher.ENCRYPT_MODE, key);      //8.獲取加密內(nèi)容的字節(jié)數(shù)組(這里要設(shè)置為utf-8)不然內(nèi)容中如果有中文和英文混合中文就會(huì)解密為亂碼      byte [] byte_encode=content.getBytes("utf-8");      //9.根據(jù)密碼器的初始化方式--加密：將數(shù)據(jù)加密      byte [] byte_AES=cipher.doFinal(byte_encode);     //10.將加密后的數(shù)據(jù)轉(zhuǎn)換為字符串      //這里用Base64Encoder中會(huì)找不到包      //解決辦法：      //在項(xiàng)目的Build path中先移除JRE System Library，再添加庫(kù)JRE System Library，重新編譯后就一切正常了。      String AES_encode=new String(new BASE64Encoder().encode(byte_AES));     //11.將字符串返回      return AES_encode;    } catch (NoSuchAlgorithmException e) {      e.printStackTrace();    } catch (NoSuchPaddingException e) {      e.printStackTrace();    } catch (InvalidKeyException e) {      e.printStackTrace();    } catch (IllegalBlockSizeException e) {      e.printStackTrace();    } catch (BadPaddingException e) {      e.printStackTrace();    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    }        //如果有錯(cuò)就返加nulll    return null;       }  /*   * 解密   * 解密過(guò)程：   * 1.同加密1-4步   * 2.將加密后的字符串反紡成byte[]數(shù)組   * 3.將加密內(nèi)容解密   */  public static String AESDncode(String encodeRules,String content){    try {      //1.構(gòu)造密鑰生成器，指定為AES算法,不區(qū)分大小寫      KeyGenerator keygen=KeyGenerator.getInstance("AES");      //2.根據(jù)ecnodeRules規(guī)則初始化密鑰生成器      //生成一個(gè)128位的隨機(jī)源,根據(jù)傳入的字節(jié)數(shù)組      keygen.init(128, new SecureRandom(encodeRules.getBytes()));       //3.產(chǎn)生原始對(duì)稱密鑰      SecretKey original_key=keygen.generateKey();       //4.獲得原始對(duì)稱密鑰的字節(jié)數(shù)組      byte [] raw=original_key.getEncoded();      //5.根據(jù)字節(jié)數(shù)組生成AES密鑰      SecretKey key=new SecretKeySpec(raw, "AES");       //6.根據(jù)指定算法AES自成密碼器      Cipher cipher=Cipher.getInstance("AES");       //7.初始化密碼器，第一個(gè)參數(shù)為加密(Encrypt_mode)或者解密(Decrypt_mode)操作，第二個(gè)參數(shù)為使用的KEY      cipher.init(Cipher.DECRYPT_MODE, key);      //8.將加密并編碼后的內(nèi)容解碼成字節(jié)數(shù)組      byte [] byte_content= new BASE64Decoder().decodeBuffer(content);      /*       * 解密       */      byte [] byte_decode=cipher.doFinal(byte_content);      String AES_decode=new String(byte_decode,"utf-8");      return AES_decode;    } catch (NoSuchAlgorithmException e) {      e.printStackTrace();    } catch (NoSuchPaddingException e) {      e.printStackTrace();    } catch (InvalidKeyException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    } catch (IllegalBlockSizeException e) {      e.printStackTrace();    } catch (BadPaddingException e) {      e.printStackTrace();    }        //如果有錯(cuò)就返加nulll    return null;       }    public static void main(String[] args) {    SymmetricEncoder se=new SymmetricEncoder();    Scanner scanner=new Scanner(System.in);    /*     * 加密     */    System.out.println("使用AES對(duì)稱加密，請(qǐng)輸入加密的規(guī)則");    String encodeRules=scanner.next();    System.out.println("請(qǐng)輸入要加密的內(nèi)容:");    String content = scanner.next();    System.out.println("根據(jù)輸入的規(guī)則"+encodeRules+"加密后的密文是:"+se.AESEncode(encodeRules, content));        /*     * 解密     */    System.out.println("使用AES對(duì)稱解密，請(qǐng)輸入加密的規(guī)則：(須與加密相同)");     encodeRules=scanner.next();    System.out.println("請(qǐng)輸入要解密的內(nèi)容（密文）:");     content = scanner.next();    System.out.println("根據(jù)輸入的規(guī)則"+encodeRules+"解密后的明文是:"+se.AESDncode(encodeRules, content));  }}