[英]RSA encrypt with OpenSSL in Qt/C++ and decrypt in Java: Bad Padding Exception
I am trying out a sample program where I am encrypting a string with RSA public key in C++ Qt Framework (using statically linked OpenSSL C++ library), and decrypting the same ciphertext using javax.crypto library. 我正在使用我 PC 上的空閑端口通過套接字連接將這個密文發送到本地主機。
以下是代碼:
我的 Qt/C++ 代碼:
主.cpp:
#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();
}
對於 encryptRSA function,我使用了 VoidRealms 教程中的示例。 這是 GitHub 鏈接: https://github.com/voidrealms/Qt-154
從上面的鏈接中,我使用cipher.h
和cipher.cpp
沒有任何更改。
Java代碼:
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;
}
}
此外,我使用標准 OpenSSL 命令生成了這些密鑰。 我嘗試使用具有不同位長度的不同密鑰,但我得到了同樣的錯誤。 我已將privatekey.pem
轉換為 PKCS8 ( privatekey-pkcs8.pem
)。 為了生成和使用密鑰,我點擊了下面的鏈接:
https://adangel.org/2016/08/29/openssl-rsa-java/
問題:
我收到javax.crypto.BadPaddingException: Decryption error
。 我究竟做錯了什么?
我已經嘗試過的事情
請幫我解決這個問題。
好的,我在發布后的 20 分鍾內解決了這個問題,方法是將密文轉換為 Base64 並通過套接字傳遞,當然,在接收端,我需要將其解碼回字節。
以前當我嘗試這個時,我忘記將 Base64 文本解碼回字節。 對不起,如果我浪費了別人的時間。
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