在Qt/C++;Java中的加密和解密:错误填充异常 我正在尝试一个示例程序,在C++ QT框架中使用RSA公钥加密字符串(使用静态链接OpenSSL C++库),并使用JavaX.Cuto库解密同一密文。我使用电脑上的免费端口通过套接字连接将此密文发送到本地主机
以下是代码: 我的Qt/C++代码: main.cpp:在Qt/C++;Java中的加密和解密:错误填充异常 我正在尝试一个示例程序,在C++ QT框架中使用RSA公钥加密字符串(使用静态链接OpenSSL C++库),并使用JavaX.Cuto库解密同一密文。我使用电脑上的免费端口通过套接字连接将此密文发送到本地主机,java,c++,qt,encryption,openssl,Java,C++,Qt,Encryption,Openssl,以下是代码: 我的Qt/C++代码: main.cpp: #include "cipher.h" #include "assert.h" #include "string.h" #include <QApplication> #include <QTcpSocket> int main(int argc, char *argv[]) { QApplication a(argc, argv); C
#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();
}
此外,我使用标准的OpenSSL命令生成了这些密钥。我试着使用不同的键和不同的位长度,但我得到了相同的错误。我已将privatekey.pem
转换为PKCS8(privatekey-PKCS8.pem
)。为了生成和使用密钥,我遵循以下链接:
问题:
我在Java中得到javax.crypto.BadPaddingException:Decryption error
。我做错了什么
我已经尝试过的事情
- 我是加密新手,我不知道是否应该将此密文编码为base64或hex,当我尝试此方法时,Java抱怨密文长度超过了允许的最大位
- 在qts->write()阶段,我尝试在几种数据类型和格式之间进行转换,包括const char*、char[]、QByteArray、toUtf8().toconstData()、std::string,使用QString::fromUtf8()和QString::fromLocal8bit()转换为QString。我应该试试Utf16和拉丁语吗
请帮我解决这个问题。好的,我在发布后的20分钟内解决了这个问题,将密文转换为Base64并通过套接字传递,当然,在接收端,我需要将其解码回字节 以前,当我尝试这样做时,我忘记将Base64文本解码回字节。对不起,我浪费了别人的时间
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;
}
}