package cn.chnmuseum.party.auth.util;

import org.apache.commons.lang3.StringUtils;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class AESUtils {
    private static String KEY = "guobomimajiamics";
    private static String IV = "guobomimajiamics";
    /**
     * AES解密
     * @param encryptStr 密文
     * @return 明文
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr) throws Exception {
        if (StringUtils.isEmpty(encryptStr)) {
            return null;
        }

        byte[] encryptByte = Base64.getDecoder().decode(encryptStr);
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(KEY.getBytes(), "AES"),new IvParameterSpec(IV.getBytes()));
        byte[] decryptBytes = cipher.doFinal(encryptByte);
        return new String(decryptBytes);
    }

    /**
     * AES加密
     * @param content 明文
     * @return 密文
     * @throws Exception
     */
    public static String aesEncrypt(String content) throws Exception {
        if (StringUtils.isEmpty(content)) {
            return null;
        }

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(KEY.getBytes(), "AES"),new IvParameterSpec(IV.getBytes()));

        byte[] encryptStr = cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
        return Base64.getEncoder().encodeToString(encryptStr);
    }

}