我一直在开发一个允许服务器和客户端之间进行通信的java应用程序。服务器和客户端都将生成公钥和私钥，然后将公钥发送给彼此。然后程序使用该公钥加密和发送消息。但是，尝试使用私钥解密这些消息时会出现问题。有谁知道如何解决这个问题？
以下是相关课程的代码：
package com.company;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class network {
static ServerSocket s;
static Socket s1;
static OutputStream s1out;
static DataOutputStream dos;
static InputStream s1in;
static chatWindowScreen gui = new chatWindowScreen();
public static aystmmetricEncryption rsa = new aystmmetricEncryption();
static PublicKey publicKey;
static PrivateKey privateKey;
static String st;
public static void serverSetup(String port) throws Exception {
int portInt = Integer.parseInt(port);
s = new ServerSocket(portInt);
s1 = s.accept();
rsa.generateKeys();
privateKey = rsa.getPrivateKey();
publicKey = serverKeys();
System.out.println(publicKey);
}
public static PublicKey serverKeys() throws IOException, ClassNotFoundException {
ObjectOutputStream ob0ut = new ObjectOutputStream(s1.getOutputStream());
ObjectInputStream obIn = new ObjectInputStream(s1.getInputStream());
ob0ut.writeObject(rsa.getPublicKey());
ob0ut.flush();
Object obj = obIn.readObject();
PublicKey publicKey = (PublicKey) obj;
return publicKey;
}
public static void clientSetup(String port, String ip) throws Exception {
int portInt = Integer.parseInt(port);
s1 = new Socket(ip, portInt);
rsa.generateKeys();
publicKey = clientKeys();
privateKey = rsa.getPrivateKey();
System.out.println(publicKey);
}
public static PublicKey clientKeys() throws IOException, ClassNotFoundException {
ObjectOutputStream ob0ut = new ObjectOutputStream(s1.getOutputStream());
ObjectInputStream obIn = new ObjectInputStream(s1.getInputStream());
Object obj = obIn.readObject();
PublicKey publicKey = (PublicKey) obj;
ob0ut.writeObject(rsa.getPublicKey());
ob0ut.flush();
return publicKey;
}
public static void closeConnection() throws IOException {
dos.close();
s1out.close();
s1.close();
}
public static void sendMsg(String message) throws IOException, IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
s1out = s1.getOutputStream();
dos = new DataOutputStream(s1out);
/*Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
String t1 = sdf.format(cal.getTime());*/
message = rsa.encryptMessage(message,publicKey);
dos.writeUTF(message);
gui.sent.append(message);
gui.received.append("\n");
}
public static void receiveMsg() throws IOException, IllegalBlockSizeException, InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException {
s1in = s1.getInputStream();
DataInputStream dis = new DataInputStream(s1in);
st = (dis.readUTF());
String st1 = rsa.decryptMessage(privateKey,st);
System.out.println(st1);
System.out.println(rsa.decryptMessage(privateKey,st));
gui.received.append(st1);
gui.sent.append("\n");
st = null;
}
}
和
package com.company;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.security.*;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
public class aystmmetricEncryption {
static PrivateKey privateKey;
static PublicKey publicKey;
public static void generateKeys() throws Exception {
Map<String, Object> keys = getRSAKeys();
privateKey = (PrivateKey) keys.get("private");
publicKey = (PublicKey) keys.get("public");
}
private static Map<String, Object> getRSAKeys() throws Exception {
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(2048);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
PrivateKey privateKey = keyPair.getPrivate();
PublicKey publicKey = keyPair.getPublic();
Map<String, Object> keys = new HashMap<String, Object>();
keys.put("private", privateKey);
keys.put("public", publicKey);
return keys;
}
public static String encryptMessage(String plainText, PublicKey publicKey) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return Base64.getEncoder().encodeToString(cipher.doFinal(plainText.getBytes()));
}
public static String decryptMessage(PrivateKey privateKey, String encryptedText) throws BadPaddingException, IllegalBlockSizeException, InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return new String(cipher.doFinal(Base64.getDecoder().decode(encryptedText)));
}
public PublicKey getPublicKey() {
return publicKey;
}
public PrivateKey getPrivateKey() {
return privateKey;
}
}
例外的Stacktrace：
Exception in thread "main" javax.crypto.BadPaddingException: Decryption error
at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:380)
at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:291)
at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:363)
at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
at javax.crypto.Cipher.doFinal(Cipher.java:2165)
at com.company.aystmmetricEncryption.decryptMessage(aystmmetricEncryption.java:54)
at com.company.network.receiveMsg(network.java:120)
at com.company.Main.server(Main.java:121)
at com.company.Main.contacts(Main.java:104)
at com.company.Main.main(Main.java:16)