前后端使用 RSA非对称加密传输数据

使用思路流程：后端生成公钥、私钥。前端获取公钥后使用公钥对明文加密，然后后端使用私钥对密文解密。
前端引用：jsencrypt.min.js

package com.ruoyi.common.utils;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.collections.MapUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

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;

@Component
public class RsaUtils {
        // Rsa 私钥 也可固定秘钥对 若依原写法(不安全)
        public static String privateKeys = "";
        private static String publicKeyStr = "";
        private static String privateKeyStr = "";
        private static final RsaKeyPair rsaKeyPair = new RsaKeyPair();
        private static final Logger logger = LoggerFactory.getLogger(MapUtils.class);

        /**
         * 私钥解密
         *
         * @param text 待解密的文本
         * @return 解密后的文本
         */
        public static String decryptByPrivateKey(String text) throws Exception {
//        logger.info(rsaKeyPair.getPrivateKey());
            return decryptByPrivateKey(rsaKeyPair.getPrivateKey(), text);
        }

        /**
         * 公钥解密
         *
         * @param publicKeyString 公钥
         * @param text            待解密的信息
         * @return 解密后的文本
         */
        public static String decryptByPublicKey(String publicKeyString, String text) throws Exception {
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, publicKey);
            byte[] result = cipher.doFinal(Base64.decodeBase64(text));
            return new String(result);
        }

        /**
         * 私钥加密
         *
         * @param privateKeyString 私钥
         * @param text             待加密的信息
         * @return 加密后的文本
         */
        public static String encryptByPrivateKey(String privateKeyString, String text) throws Exception {
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, privateKey);
            byte[] result = cipher.doFinal(text.getBytes());
            return Base64.encodeBase64String(result);
        }

        /**
         * 私钥解密
         *
         * @param privateKeyString 私钥
         * @param text             待解密的文本
         * @return 解密后的文本
         */
        public static String decryptByPrivateKey(String privateKeyString, String text) throws Exception {
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] result = cipher.doFinal(Base64.decodeBase64(text));
            return new String(result);
        }

    /**
     * 公钥加密
     *
     * @param publicKeyString 公钥
     * @param text            待加密的文本
     * @return 加密后的文本
     */
    public static String encryptByPublicKey(String publicKeyString, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

        /**
         * 构建RSA密钥对
         *
         * @return 生成后的公私钥信息
         */
        @Bean
        public void generateKeyPair() throws NoSuchAlgorithmException, NoSuchProviderException {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(1024);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
            RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
            String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
            String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
            rsaKeyPair.setPrivateKey(privateKeyString);
            rsaKeyPair.setPublicKey(publicKeyString);
            publicKeyStr = publicKeyString;
            privateKeyStr = privateKeyString;
        }


        public static String getPublicKey() {
            return publicKeyStr;
        }

        public static String getPrivateKey() {
            return privateKeyStr;
        }

        public static RsaKeyPair rsaKeyPair() {
            return rsaKeyPair;
        }

        /**
         * RSA密钥对对象
         */
        public static class RsaKeyPair {
            private String publicKey;
            private String privateKey;

            public void setPublicKey(String publicKey) {
                this.publicKey = publicKey;
            }

            public void setPrivateKey(String privateKey) {
                this.privateKey = privateKey;
            }

            public RsaKeyPair() {

            }

            public RsaKeyPair(String publicKey, String privateKey) {
                this.publicKey = publicKey;
                this.privateKey = privateKey;
            }

            public String getPublicKey() {
                return publicKey;
            }

            public String getPrivateKey() {
                return privateKey;
            }
        }
}