package cn.besteam.common.util;

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.Random;


public class AESUtil {

    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 key 加密密钥
     * @return 返回Base64转码后的加密数据
     */
    public static String encrypt(String content, String key) {
        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(key));// 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(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    /**
     * AES 解密操作
     *
     * @param content
     * @param key
     * @return
     */
    public static String decrypt(String content, String key) {

        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(key));

            //执行操作
            // byte[] result = cipher.doFinal(Base64Utils.decode(content));

            byte[] decryptBytes = cipher.doFinal(Base64.decodeBase64(content.getBytes("utf-8")));
            return new String(decryptBytes);
        } catch (Exception ex) {
//            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    /**
     * 生成加密秘钥
     *
     * @return
     */
    private static SecretKeySpec getSecretKey(final String key) {
        //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(key.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(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }
    public static void main(String[] args) {
        Random random = new Random();
        int ran = random.nextInt(10);
        System.out.println(ran);
    }

    /*public static void main(String[] args) {
        String content = "[{\"collectUpdateDate\":\"2020-12-15 11:03:58\",\"codeid\":\"05170142010101744261\",\"stagingId\":\"13000732801\",\"sourceDeptId\":\"200814173557128\",\"sourceDeptName\":\"内科\",\"standardDeptCode\":\"A03\",\"trashType\":\"1\",\"weight\":\"15.5\",\"bag\":\"1\",\"collectUserId\":\"890478026930\",\"collectUserName\":\"张三\",\"trashStatus\":\"10\"}]";
        String key = "8oneeiy5b5gbepzu";
        System.out.println("原文:" + content);
        String s1 = AESUtil.encrypt(content, key);
        System.out.println("加密:" + s1);
        System.out.println("解密:"+AESUtil.decrypt(s1, key));
        System.out.println(AESUtil.encrypt("[{\"collectUpdateDate\":\"2020-12-15 11:03:58\",\"codeid\":\"05170142010101744261\",\"stagingId\":\"13000732801\",\"sourceDeptId\":\"200814173557128\",\"sourceDeptName\":\"内科\",\"standardDeptCode\":\"A03\",\"trashType\":\"1\",\"weight\":\"15.5\",\"bag\":\"1\",\"collectUserId\":\"890478026930\",\"collectUserName\":\"张三\",\"trashStatus\":\"10\"}]","8oneeiy5b5gbepzu"));
    }*/
}