package com.dbenefit.utils;


import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;

public class AESUtils {

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

    /**
     * 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 {
            // 创建密码器
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            // 初始化为加密模式的密码器
            byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
            SecretKeySpec sks = new SecretKeySpec(keyBytes, KEY_ALGORITHM);
            byte[] byteContent = content.getBytes(StandardCharsets.UTF_8);
            cipher.init(Cipher.ENCRYPT_MODE, sks);
            // 加密
            byte[] result = cipher.doFinal(byteContent);
            //通过Base64转码返回
            return Base64.getEncoder().encodeToString(result);
        } catch (Exception ex) {
            System.out.println("加密失败");
            ex.printStackTrace();
        }
        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
            byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
            SecretKeySpec sks = new SecretKeySpec(keyBytes, KEY_ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, sks);
            //执行操作
            byte[] result = cipher.doFinal(Base64.getDecoder().decode((content)));
            return new String(result, StandardCharsets.UTF_8);
        } catch (Exception ex) {
            System.out.println("解密失败");
            ex.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {
        String content = "{\"account\":\"zhangsan\",\"username\":\"张三\",\"mobile\":\"15021901234\"}";
        String secretKey = "7ICpVwYq7WNmileT";

        String encrypt = encrypt(content, secretKey);
        System.out.println("加密后:" + encrypt);

        String decrypt = decrypt(encrypt, secretKey);
        System.out.println("解密后：" + decrypt);
    }
}