package com.ydtech.utils;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
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;

/**
 * @author gws
 * @description：TODO
 * @date 2021-10-25 20:42
 */
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


    static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbZQdTB2ZxoqQkcPsMwrlIGJB4Z3upil2H7KV7n6I7wGtMfvLyFmMUAfPZ0ly5HOJONu3ZrG+G5tYFbYTcwvBAThUCYoBUphdhj8DSC7PJhYJBj34jqS0VYrilKPykPMLKvOxw+KNsJEQKyrMn7kPTq75CzjL2SB0MEvyMJiVcoQIDAQAB";
    static String privateKey = "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";

    public static void main(String[] args) throws Exception {
        //生成公钥和私钥
        //genKeyPair();
        //System.out.println("随机生成的公钥为:" + keyMap.get(0));
        //System.out.println("随机生成的私钥为:" + keyMap.get(1));
        //加密字符串
        String message = "guoweisong--郭维嵩";

        String messageEn = encrypt(message, publicKey);
        System.out.println(message + "\t加密后的字符串为:" + messageEn);
        String messageDe = decrypt(messageEn, privateKey);
        System.out.println("还原后的字符串为:" + messageDe);
    }

    /**
     * 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
    }

    /**
     * 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 {
        //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;
    }

}