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The messaging and data conversion protocol between Java and DolphinDB server

There is a newer version: 1.0.27

package com.xxdb;

import javax.crypto.Cipher;
import java.io.IOException;
import java.security.*;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

public class RSAUtils {
    public static PublicKey getPublicKey(String keyCode) throws IOException {
        try {
            byte[] keyBytes = decodeOpenSSLPublicKey(keyCode);
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            return keyFactory.generatePublic(keySpec);
        } catch (Exception ex) {
            throw new IOException(ex.getMessage());
        }
    }

    public static byte[] decodeOpenSSLPublicKey(String instr) {
        String pempubheader = "-----BEGIN PUBLIC KEY-----";
        String pempubfooter = "-----END PUBLIC KEY-----";
        String pemstr = instr.trim();
        byte[] binkey;
        pemstr = pemstr.replace(pempubheader, "").replace(pempubfooter, "").replaceAll("\\s", "");
        String pubstr = pemstr.trim();
        binkey = Base64.getDecoder().decode(pubstr);
        return binkey;
    }

    public static byte[] encryptByPublicKey(byte[] data, PublicKey pk) throws IOException {
        try {
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            cipher.init(Cipher.ENCRYPT_MODE, pk);
            return cipher.doFinal(data);
        } catch (Exception ex) {
            throw new IOException(ex.getMessage());
        }
    }
}