package com.jianshui.common.utils;


import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.logging.Level;
import java.util.logging.Logger;

/**

 * @version V1.0

 * @desc AES 加密工具类

 */

public class AESUtil1 {

   private static final String KEY_ALGORITHM = "AES";

    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";//默认的加密算法

 /**

     * AES 加密操作

     *

     * @param content 待加密内容

     * @param password 加密密码

     * @return 返回Base64转码后的加密数据

     */

   public static String aesencrypt(String content, String password) {

        try {

            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 创建密码器

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

    cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(password));// 初始化为加密模式的密码器

            byte[] result = cipher.doFinal(byteContent);// 加密

            return Base64.encodeBase64String(result);//通过Base64转码返回

        } catch (Exception ex) {

                              Logger.getLogger(AESUtil1.class.getName()).log(Level.SEVERE, null, ex);

        }

        return null;

    }


    /**

     * AES 解密操作

     *

     * @param content

     * @param password

     * @return

     */

  public static String decrypt(String content, String password) {
     try {
     //实例化
     Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
     //使用密钥初始化，设置为解密模式
   cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));
     //执行操作
      byte[] result = cipher.doFinal(Base64.decodeBase64(content));

            return new String(result, "utf-8");

  } catch (Exception ex) {

            Logger.getLogger(AESUtil1.class.getName()).log(Level.SEVERE, null, ex);

        }

        return null;

    }

 /**

     * 生成加密秘钥

      * @return

     */

 private static SecretKeySpec getSecretKey(final String password) {

        //返回生成指定算法密钥生成器的 KeyGenerator 对象

        KeyGenerator kg = null;

        try {

            kg = KeyGenerator.getInstance(KEY_ALGORITHM);

   //AES 要求密钥长度为 128

            kg.init(128, new SecureRandom(password.getBytes()));

            //生成一个密钥

            SecretKey secretKey = kg.generateKey();

            return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 转换为AES专用密钥

        } catch (NoSuchAlgorithmException ex) {

            Logger.getLogger(AESUtil1.class.getName()).log(Level.SEVERE, null, ex);

        }

       return null;

    }


    public static void main(String[] args) {

        String s = "美女，你好";

     System.out.println("s:" + s);
     String s1 = AESUtil1.aesencrypt(s, "123654");
     System.out.println("s1:" + s1);
      System.out.println("s2:"+AESUtil1.decrypt(s1, "123654"));

    }

}
