package com.moral.util;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.net.util.Base64;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * @ClassName AESUtil
 * @Description AES工具类
 * @Author 陈凯裕
 * @Date 2021/3/9 14:25
 * @Version TODO
 **/
@Slf4j
@Component
public class AESUtils {
    //密钥
    public static String key ;
    //字符集
    private static String charset = "utf-8";
    // 偏移量
    private static int offset = 16;
    //AES种类
    private static String transformation = "AES/CBC/PKCS5Padding";
    private static String algorithm = "AES";


    @Value("${AES.KEY}")
    public  void setKey(String key) {
        AESUtils.key = key;
    }



    //加密
    public static String encrypt(String content) {
        return encrypt(content, key);
    }

    //解密
    public static String decrypt(String content) {
        return decrypt(content, key);
    }

    //加密
    public static String encrypt(String content, String key) {
        try {
            SecretKeySpec skey = new SecretKeySpec(key.getBytes(), algorithm);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes(), 0, offset);
            Cipher cipher = Cipher.getInstance(transformation);
            byte[] byteContent = content.getBytes(charset);
            cipher.init(Cipher.ENCRYPT_MODE, skey, iv);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return new Base64().encodeToString(result); // 加密
        } catch (Exception e) {
            log.error("Encryption failed!");
            e.printStackTrace();
        }
        return null;
    }

    //解密
    public static String decrypt(String content, String key) {
        try {
            SecretKeySpec skey = new SecretKeySpec(key.getBytes("utf-8"), algorithm);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes("utf-8"), 0, offset);
            Cipher cipher = Cipher.getInstance(transformation);
            cipher.init(Cipher.DECRYPT_MODE, skey, iv);// 初始化
            byte[] result = cipher.doFinal(new Base64().decode(content));
            return new String(result); // 解密
        } catch (Exception e) {
            log.error("Decryption failed!");
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {
       // System.out.println(encrypt("123456","AD42F7787B035B7580000EF93BE20BAD"));
        //123456 KoWjfDMZQhJMLlG1crBPqQ==
        // 部分提交
        String str = decrypt("KoWjfDMZQhJMLlG1crBPqQ==", "AD42F7787B035B7580000EF93BE20BAD");
        System.out.println(str);
    }

}