RSA-Java加解密

背景介绍

项目中最近使用RSA算法对敏感数据进行加解密,因此在结合网上相关文章后进行整理。
RSA算法是一种非对称加密算法,会生成一对RSA秘钥,即公钥+私钥,将公钥提供给调用方，调用方使用公钥对数据进行加密后,接口根据私钥进行解密

JAVA RSA加解密工具类

基础工具类

import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * Title:RSAUtil
 * Description:
 * Company:
 *
 * @version 1.0
 * @Create zhoujt
 * @Author 2022-01-09 15-22
 **/
public class RSAUtil {
   

    public static final String KEY_ALGORITHM = "RSA";

    private static final String PUBLIC_KEY = "RSAPublicKey";

    private static final String PRIVATE_KEY = "RSAPrivateKey";

    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;

    /**
     * 生成密钥对
     */
    public static Map<String, Object> initKey() throws Exception {
   
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        //设置密钥对的bit数 越大越安全
        keyPairGen.initialize(1024);
        KeyPair keyPair = keyPairGen.generateKeyPair();
        //获取公钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        //获取私钥
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        Map<String, Object> keyMap = new HashMap(2);
        keyMap.put(PUBLIC_KEY, publicKey);
        keyMap.put(PRIVATE_KEY, privateKey);
        return keyMap;
    }

    /**
     * 获取公钥字符串
     */
    public static String getPublicKeyStr(Map<String, Object> keyMap) throws Exception {
   
        //获得map中的公钥对象 转为key对象
        Key key = (Key) keyMap.