package com.doumee.config.interfaceencryption.tool;


import com.doumee.core.constants.ResponseStatus;
import com.doumee.core.exception.BusinessException;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

@Slf4j
public class RSAEncrypt {
    private static Map<Integer, String> keyMap = new HashMap<Integer, String>();  //用于封装随机产生的公钥与私钥

    public static String privateKey = "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";
    public static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCZDoLPxa4aV7N0M3YYkPXhXSuxxAjzT2nYXnCQOUlNpBMfhZUZ2wO2ff06oPUWFeM7rsad3GKfX2vAMsEc1SB2CwqJLd/W1GCLBFSUHYeCka9brJf8fFr9uBo3J7g5bC58AIErKjXFTP+F4bWnqsq5jTBG0+2KsSYwRiTWpsEn1wIDAQAB";

//    public static void main(String[] args) throws Exception {
//        String phone = "18256057064";
//        String encrypt = encrypt(phone, publicKey);
//        System.out.println("加密后"+encrypt);
//        System.out.println("解密后"+decrypt(encrypt, privateKey));
//    }

    /**
     * 随机生成密钥对
     *
     * @throws NoSuchAlgorithmException
     */
    public static void genKeyPair() throws NoSuchAlgorithmException {
        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
        // 初始化密钥对生成器，密钥大小为96-1024位
        keyPairGen.initialize(1024, new SecureRandom());
        // 生成一个密钥对，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥
        String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
        // 得到私钥字符串
        String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
        // 将公钥和私钥保存到Map
        keyMap.put(0, publicKeyString);  //0表示公钥
        keyMap.put(1, privateKeyString);  //1表示私钥

        System.out.println("公钥:" + publicKeyString);
        System.out.println("私钥:" + privateKeyString);
    }


    /**
     * RSA公钥加密
     *
     * @param str       加密字符串
     * @param publicKey 公钥
     * @return 密文
     * @throws Exception 加密过程中的异常信息
     */
    public static String encrypt(String str, String publicKey) throws Exception {
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }

    /**
     * RSA私钥解密
     *
     * @param str        加密字符串
     * @param privateKey 私钥
     * @return 铭文
     * @throws Exception 解密过程中的异常信息
     */
    public static String decrypt(String str, String privateKey) throws Exception {
        try {
            log.info("RSA私钥解密 str = " + str);
            log.info("RSA私钥解密 privateKey = " + privateKey);
            //64位解码加密后的字符串
            byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
            //base64编码的私钥
            byte[] decoded = Base64.decodeBase64(privateKey);
            RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
            //RSA解密
            Cipher cipher = Cipher.getInstance("RSA");

            cipher.init(Cipher.DECRYPT_MODE, priKey);
            String outStr = new String(cipher.doFinal(inputByte));
            return outStr;
        }catch (Exception e){
           return "{}";
        }
    }
}