通过套接字发送加密的数据和解密不起作用 [英] Sending Encrypted Data Through Socket And Decrypting Doesn't Work

问题描述

我正在创建一个简单的加密软件。我目前遇到的问题是无法通过套接字发送加密的AES文件数据。在接收端，应写入的文件为空。我已经看了很长时间的代码，无法解决。

I am creating a simple encryption software. The problem I currently have is that sending encrypted aes file data through a socket doesn't work. At the receiving end, the file that should be written to is empty. I have looked through my code for a good while and can't see to solve it.

我制作了一个没有联网的版本。
我已经能够在不同版本上发送最多8 KB的小文件

I have made a version without networking. I have been able to send a small file up to 8 KB on a different version

我的程序基于功能，因此该程序从主菜单中退出其他菜单和功能。由于存在一些跳跃，因此最好显示所有代码。
https://github.com/BaconBombz/Dencryptor/ blob / Version-2.0 / Dencryptor.py

My Program Is Function Based So The Program Branches Off From The Main Menu To Other Menues And Functions. Since There is A Bit Of Jumping, It Would Be Best To Show All The Code. https://github.com/BaconBombz/Dencryptor/blob/Version-2.0/Dencryptor.py

套接字已连接，并且已发送所有必需的数据。然后，文件经过AES加密并通过套接字发送。接收端将加密的数据写入文件并解密。程序会说文件已发送，但在接收端，程序会发出结构错误，因为应该包含加密数据的文件为空。

The socket connects, and all required data is sent. Then, the file is AES encrypted and sent through the socket. The Receiving end writes encrypted data to a file and decrypts it. The program will say the file was sent but on the recieving end, the program spits out a struct error because the file that should have the encrypted data is empty.

推荐答案

代码太小了（最小），因此这是下载未加密文件的最小示例。另外，TCP是一种流协议，使用睡眠来分离数据是不正确的。为字节流定义一个协议。这是我的示例的协议：

The code is too non-minimal so here's a minimal example of downloading an unencrypted file. Also, TCP is a streaming protocol and using sleeps to separate your data is incorrect. Define a protocol for the byte stream instead. This is the protocol of my example:

1. 打开连接。


2. 发送UTF-8 -编码的文件名后跟换行符。


3. 以十进制形式发送编码后的文件大小，后跟换行符。


4. 发送文件字节。
>

5. 关闭连接。

1. Open the connection.
2. Send the UTF-8-encoded filename followed by a newline.
3. Send the encoded file size in decimal followed by a newline.
4. Send the file bytes.
5. Close the connection.

注意Python 3代码。 Python 2对我已经死了。支持将在明年结束，因此升级！

Note Python 3 code. Python 2 is dead to me. Support ends next year for it so upgrade!

server.py

from socket import *
import os

CHUNKSIZE = 1_000_000

# Make a directory for the received files.
os.makedirs('Downloads',exist_ok=True)

sock = socket()
sock.bind(('',5000))
sock.listen(1)

with sock:
    while True:
        client,addr = sock.accept()

        # Use a socket.makefile() object to treat the socket as a file.
        # Then, readline() can be used to read the newline-terminated metadata.
        with client, client.makefile('rb') as clientfile:
            filename = clientfile.readline().strip().decode()
            length = int(clientfile.readline())
            print(f'Downloading {filename}:{length}...')
            path = os.path.join('Downloads',filename)

            # Read the data in chunks so it can handle large files.
            with open(path,'wb') as f:
                while length:
                    chunk = min(length,CHUNKSIZE)
                    data = clientfile.read(chunk)
                    if not data: break # socket closed
                    f.write(data)
                    length -= len(data)

            if length != 0:
                print('Invalid download.')
            else:
                print('Done.')

client.py

from socket import *
import os

CHUNKSIZE = 1_000_000

filename = input('File to upload: ')

sock = socket()
sock.connect(('localhost',5000))
with sock,open(filename,'rb') as f:
    sock.sendall(filename.encode() + b'\n')
    sock.sendall(f'{os.path.getsize(filename)}'.encode() + b'\n')

    # Send the file in chunks so large files can be handled.
    while True:
        data = f.read(CHUNKSIZE)
        if not data: break
        sock.sendall(data)

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