问RSA在Qt/C++中用OpenSSL加密，在Java中解密:坏的填充异常

EN

#include "cipher.h"
#include "assert.h"
#include "string.h"
#include <QApplication>
#include <QTcpSocket>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Cipher *cipher=new Cipher();

    QTcpSocket *qts=new QTcpSocket();
    qts->connectToHost("localhost",11111);

    QByteArray message, enc_key,enc_message;

    message="Elephant";
   
    enc_message=cipher->encryptRSA(cipher->getPublicKey("publickey.pem"),message);

    qDebug()<<message;
    qDebug()<<enc_message;

    if(qts->waitForConnected(300)){
        qts->write(QString::fromStdString(enc_message.toStdString()).toUtf8().constData());
        qts->write("\n");
        qts->flush();
    }

    return a.exec();
}

package servertest;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import org.apache.commons.io.FileUtils;

public class ServerTest {
    static int port=11111;
    static ServerSocket ss;
    static Socket s;
    
    public static void main(String[] args) {
        System.out.println("Server Started!");
        try {
            ss = new ServerSocket(port);
            s=ss.accept();
            
            InputStreamReader isr = new InputStreamReader(new BufferedInputStream(s.getInputStream()));
            BufferedReader br = new BufferedReader(isr);
            
            String str=br.readLine();
            
            System.out.println("Received: "+str);
            byte[] encrypted = str.getBytes("UTF-8");
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            PrivateKey privateKey = loadPrivateKey();
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] decrypted = cipher.doFinal(encrypted); 
            
            System.out.println("Decrypted: "+new String(decrypted));
            
        } catch (IOException ex) {
            Logger.getLogger(ServerTest.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InvalidKeyException ex) {
            Logger.getLogger(ServerTest.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(ServerTest.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NoSuchPaddingException ex) {
            Logger.getLogger(ServerTest.class.getName()).log(Level.SEVERE, null, ex);
        } catch (Exception ex) {
            Logger.getLogger(ServerTest.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    
    public static PrivateKey loadPrivateKey() throws Exception {
        String privateKeyPEM = FileUtils.readFileToString(new File("privatekey-pkcs8.pem"), StandardCharsets.UTF_8);

        // strip off header, footer, newlines, whitespaces
        privateKeyPEM = privateKeyPEM
                .replace("-----BEGIN PRIVATE KEY-----", "")
                .replace("-----END PRIVATE KEY-----", "")
                .replace("-----BEGIN RSA PRIVATE KEY-----", "")
                .replace("-----END RSA PRIVATE KEY-----", "")
                .replaceAll("\\s", "");
        
        //System.out.println(privateKeyPEM);
        
        // decode to get the binary DER representation
        byte[] privateKeyDER = Base64.getDecoder().decode(privateKeyPEM.getBytes("UTF-8"));

        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(privateKeyDER));
        return privateKey;
    }
    
}