package com.ynxbd.common.helper.xbd;

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


/**
 * @author 李进才
 * @ClassName EncHelper
 * @Description 在线病历打印请求的加密方法
 * @date 2023/4/20 09:40
 */
public class EncHelper {
    /**
     * 密钥
     */
    private static final byte[] key = new byte[]{114, 120, 49, 55, 56, 103, 100, 109, 107, 50};
    /**
     * 向量长度
     */
    private static final byte[] ivB = new byte[]{88, 66, 68, 66, 108, 117, 101, 70, 108, 97, 103, 64, 54, 57, 33, 41};


    /**
     * AES加密
     * @param encryptString 要被加密的字符串
     * @return
     * @throws Exception
     */
    public static String AES_Encrypt(String encryptString) throws Exception {
        String keyValue = String.format("%-32s",  GetStr(key));
        byte[] iv = (GetStr(ivB).substring(0, 16)).getBytes(StandardCharsets.UTF_8);
        SecretKeySpec secretKeySpec = new SecretKeySpec(keyValue.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); //"算法/模式/补码方式"
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
        byte[] inputData = encryptString.getBytes(StandardCharsets.UTF_8);
        byte[] encrypted = cipher.doFinal(inputData);
        return Base64.getEncoder().encodeToString(encrypted);
    }


    /**
     * 64位MD5加密
     * @param context
     * @return
     * @throws Exception
     */
    public static String MD5Encrypt64(String context) throws Exception {
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        byte[] digest = md5.digest(context.getBytes("utf-8"));
        return Base64.getEncoder().encodeToString(digest);
    }

    private static String GetStr(byte[] byteList) {
        String valueStr = "";
        for (byte b : byteList) {
            valueStr += (char) b;
        }
        return valueStr;
    }
}