代码之家 › 专栏 › 技术社区 › Sandipan

使用python和rsa算法的加密聊天应用

python-sockets public-key-encryption rsa python-3.x python

Sandipan · 技术社区 · 6 年前

我试图用python中的rsa algo创建一个加密的聊天应用程序,但是我收到了错误消息。我找不到代码中的错误,聊天系统根本无法工作。client.py将终止,并显示此错误

文件“client.py”,第17行,in

           server_string = server.recv(1024)

           OSError: [Errno 107] Transport endpoint is not connected

代码如下:

server.py是:

import socket
from Crypto.PublicKey import RSA
from Crypto import Random

#Generate private and public keys
random_generator = Random.new().read
private_key = RSA.generate(1024, random_generator)
public_key = private_key.publickey()

#Declartion
mysocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostbyname(socket.getfqdn())
port = 8888
encrypt_str = "encrypted_message="

if host == "127.0.1.1":
    import commands
    host = commands.getoutput("hostname -I")
print("host = " + host)

#Prevent socket.error: [Errno 98] Address already in use
mysocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

mysocket.bind((host, port))

mysocket.listen(5)

c, addr = mysocket._accept()

while True:

    #Wait until data is received.
    data = c.recv(1024)
    data = data.replace("\r\n", '') #remove new line character

    if data == "Client: OK":
        c.send("public_key=" + public_key.exportKey() + "\n")
        print("Public key sent to client.")

    elif encrypt_str in data: #Reveive encrypted message and decrypt it.
        data = data.replace(encrypt_str, '')
        print("Received:\nEncrypted message = "+str(data))
        encrypted = eval(data)
        decrypted = private_key.decrypt(encrypted)
        c.send("Server: OK")
        print("Decrypted message = " + decrypted)

    elif data == "Quit": break

#Server to stop
c.send("Server stopped\n")
print("Server stopped")
c.close()

client.py是

import socket
from Crypto.PublicKey import RSA
import sys 
import os 

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = "127.0.0.1"
port = 7777

server.bind(("my_IP_addr_goes_here", 8880))
#data= "Client: OK"

#Tell server that connection is OK
#server.sendall("Client : OK")

#Receive public key string from server
server_string = server.recv(1024)

#Remove extra characters
server_string = server_string.replace("public_key=", '')
server_string = server_string.replace("\r\n", '')

#Convert string to key
server_public_key = RSA.importKey(server_string)

#Encrypt message and send to server
message = "This is my secret message."
encrypted = server_public_key.encrypt(message, 32)
server.sendall("encrypted_message="+str(encrypted))

#Server's response
server_response = server.recv(1024)
server_response = server_response.replace("\r\n", '')
if server_response == "Server: OK":
    print("Server decrypted message successfully")

#Tell server to finish connection
server.sendall("Quit")
print(server.recv(1024)) #Quit server response
server.close()

错误是: 服务器脚本正在运行,但当我终止脚本时,它将显示

对于server.py: ^ ctraceback(最近一次通话时间):

           File "server.py", line 28, in <module>

           c, addr = mysocket._accept()

           KeyboardInterrupt

对于client.py: 文件“client.py”,第17行,in

server_string=server.recv(1024个)

oserror:[errno 107]未连接传输终结点

1 回复 | 直到 6 年前

Conner devopensource 6 年前

你想抓住西格特…见 How do I capture SIGINT in Python?

import signal
import sys
def stop_server(sig, frame):
        server.sendall("Quit")
        print(server.recv(1024)) #Quit server response
        server.close()
        sys.exit(0)
signal.signal(signal.SIGINT, stop_server)