package com.fr.plugin.loginAuth.utils;

import com.fr.log.FineLoggerFactory;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.SecureRandom;

/**
 * 加解密工具类
 */
public class CipherUtils {
    /**
     * 加密
     *
     * @param datasource
     *            byte[]
     * @param password
     *            String
     * @return byte[]
     */
    public static byte[] desEncrypt(byte[] datasource, String password) {
        try {
            SecureRandom random = new SecureRandom();
            DESKeySpec desKey = new DESKeySpec(password.getBytes());
            // 创建一个密匙工厂，然后用它把DESKeySpec转换成
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey securekey = keyFactory.generateSecret(desKey);
            // Cipher对象实际完成加密操作
            Cipher cipher = Cipher.getInstance("DES");
            // 用密匙初始化Cipher对象
            cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
            // 现在，获取数据并加密
            // 正式执行加密操作
            return cipher.doFinal(datasource);
        } catch (Throwable e) {
            e.printStackTrace();
        }

        return null;
    }

    /**
     * 解密
     *
     * @param src
     *            byte[]
     * @param password
     *            String
     * @return byte[]
     * @throws Exception
     */
    public static byte[] desDecrypt(byte[] src, String password) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom random = new SecureRandom();
        // 创建一个DESKeySpec对象
        DESKeySpec desKey = new DESKeySpec(password.getBytes("UTF-8"));
        // 创建一个密匙工厂
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        // 将DESKeySpec对象转换成SecretKey对象
        SecretKey securekey = keyFactory.generateSecret(desKey);
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance("DES");
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, random);
        // 真正开始解密操作
        return cipher.doFinal(src);
    }

    /**
     * 自定义一个key
     **/
    public static byte[] getKey(String keyRule) {
        Key key = null;
        byte[] keyByte = keyRule.getBytes();
        // 创建一个空的八位数组,默认情况下为0
        byte[] byteTemp = new byte[8];
        // 将用户指定的规则转换成八位数组
        for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) {
            byteTemp[i] = keyByte[i];
        }
        key = new SecretKeySpec(byteTemp, "DES");
        return key.getEncoded();

    }

    /**
     * 将16进制转换为二进制
     *
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1) return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    /***
     * 解密数据
     * @param decryptString
     * @param decryptKey
     * @return
     * @throws Exception
     */
    public static String decryptDES(String decryptString, String decryptKey) throws Exception {
        SecretKeySpec key = new SecretKeySpec(getKey(decryptKey), "DES");
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte decryptedData[] = cipher.doFinal(parseHexStr2Byte(decryptString));
        return new String(decryptedData,"utf-8");
    }

    /**
     * jdksha256加密
     * @param str
     * @return
     */
    public static String jdksha256(String str)
    {
        String sha256Str = "";

        try {
            MessageDigest sha256Deget = MessageDigest.getInstance("SHA-256");
            byte[] sha256Encode = sha256Deget.digest(str.getBytes());
            sha256Str = ByteToHexStr(sha256Encode);
        }catch (Exception e){
            FineLoggerFactory.getLogger().info("FRLOG:SHA256加密异常:"+e.getMessage());
        }

        return sha256Str;
    }

    /**
     * byte数组转16进制字符串
     * @param bytes
     * @return
     */
    private static String ByteToHexStr(byte[] bytes)
    {
        String hexStr = "";

        for(int i =0;i<bytes.length;i++)
        {
            int temp = bytes[i] & 0xff;
            String tempHex = Integer.toHexString(temp);
            if(tempHex.length() < 2)
            {
                hexStr += "0"+tempHex;
            }
            else {
                hexStr += tempHex;
            }
        }

        return hexStr;
    }

    /**
     * base64加密
     * @param key
     * @return
     */
    public static String base64Encode(String key){
        return (new BASE64Encoder()).encodeBuffer(key.getBytes());
    }

    /**
     * base64解密
     * @param key
     * @return
     */
    public static String base64Decode(String key){
        String result = "";
        try {
            result = new String((new BASE64Decoder()).decodeBuffer(key));
        } catch (IOException e) {
            FineLoggerFactory.getLogger().info("FRLOG:BASE64解密异常:"+e.getMessage());
        }

        return result;
    }

    public static String getBase64DecodeStr(String str){
        if(str == null || str.isEmpty()){
            return "";
        }

        String result = base64Decode(str);
        return result.contains("base64")?result:str;
    }

    /**
     * 是否被base64加密过
     * @param str
     * @return
     */
    public static boolean isBase64(String str) {
        if (str == null || str.trim().length() == 0) {
            return false;
        }
        else {
            if (str.length() % 4 != 0) {
                return false;
            }

            char[] strChars = str.toCharArray();

            for (char c:strChars) {
                if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9')
                        || c == '+' || c == '/' || c == '=') {
                    continue;
                }
                else {
                    return false;
                }
            }

            return true;
        }
    }
    public static void main(String[] args) throws Exception {
//        String key = "z2bse2zh";
//        String key = "ajshcjzj";
//        String str = "男";
////
//        byte[] a =desEncrypt(str.getBytes(),key);
////        System.out.println(new String(a));
//        String a1 = new BASE64Encoder().encodeBuffer(a);
////
//        System.out.println(a1);
////
////        byte[] b = desDecrypt(a,key);
////        System.out.println(new String(b));
//
//        String key2 = "rdTK5iLsDFw=";
//        byte[] b2 = desDecrypt(new BASE64Decoder().decodeBuffer(key2),"ajshcjzj");
//        System.out.println(new String(b2));
//        //密钥
//        String key = "z2bse2zh";
//        //解密数据
//        String encryDate = "DF2DF0F837C38A1233A8B1255B0532E36E9D29052873B7F8707936C025E2FE368B0A8919A93C8869";
//        String a = "ED33AD65CDBAEF49";
//        String result = decryptDES(a, key);
//
//        System.out.println("result:" + result);
//        System.out.println("result2:"+new String(decrypt(result.getBytes(),key)));
    }
}