package com.project.receivedemo.utils;

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

public class SfDecryptUtil {
    private static final byte[] IV_BYTES = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

    public static byte[] decrypt(String encryptedData, String secretKey) throws Exception {
        // 顺丰推送的密文可能是 Base64 编码的字符串
        byte[] decode = Base64.getDecoder().decode(encryptedData);
        
        SecretKeySpec keySpec = new SecretKeySpec(secretKey.getBytes("UTF-8"), "AES");
        IvParameterSpec ivSpec = new IvParameterSpec(IV_BYTES);
        
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
        
        return cipher.doFinal(decode);
    }
}