我目前正面临BadPaddingException错误。我将加密数据从客户端发送到服务器。服务器将根据收到的数据进行解密 请问有人帮我看看代码并指出错误。
客户端
try{
Cipher c = Cipher.getInstance("RSA");
c.init(Cipher.ENCRYPT_MODE, servPubKey);
String myMessage = "this is a secret message";
byte[] msgByte = myMessage.getBytes();
ObjectOutputStream outVehicle3 = new ObjectOutputStream(socket.getOutputStream());
ParamClass print4 = new ParamClass (cipherText);
outVehicle3.writeObject(print4);
} catch (Throwable e) {
// TODO Auto-generated catch block
tv.append("\nUnable to perform RSA encryption!");
e.printStackTrace();
}
服务器端
ObjectInputStream inServ3 = new ObjectInputStream(socket.getInputStream());
try{
ParamClass print5 = (ParamClass) (inServ3.readObject());
Cipher dec = Cipher.getInstance("RSA");
dec.init(Cipher.DECRYPT_MODE, serverPrivateKey);
byte[] dectyptedText = dec.doFinal(print5.cipherText);
String decipherText = dectyptedText.toString();
System.out.println("\nDecrypted Message to string: " + decipherText);
}catch (Throwable e) {
e.printStackTrace();
System.out.println("Unable to perform RSA decryption!");
}
它说错误发生在以下行。
byte[] dectyptedText = dec.doFinal(print5.cipherText);
提前感谢您的帮助和指导。
答案 0 :(得分:2)
我假设您在客户端代码中缺少此行:
byte[] cipherText = c.doFinal(msgByte);
除此之外,最可能的错误是servPubKey
和serverPrivateKey
不匹配(即它们不是同一RSA密钥对的两半)。
检查它们是否匹配的快速方法是打印servPubKey.getModulus()和serverPrivateKey.getModulus()并检查它们是否相同。