这是一个简单的套接字程序，包括一个服务器和一些客户端。客户端使用简单的RSA加密算法对其文本进行加密，然后服务器解密句子并将解密后的句子发送回客户端。
服务器：
服务器：
import socket
import sys
from thread import *
from math import *
from random import *
import random
HOST = ''
PORT = 8888
size=2**16
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print 'Socket created'
#Bind socket to local host and port
try:
s.bind((HOST, PORT))
except socket.error , msg:
print 'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
sys.exit()
print 'Socket bind complete'
#Start listening on socket
s.listen(10)
print 'Socket now listening'
def decoder(codedString,d,n):
breakcoded=[]
coded=(codedString)
#print coded;
for i in range (len(coded)):
breakcoded.append(chr(((int(coded[i])**d) % n)+48))
stri= ""
for i in range (len(breakcoded)):
stri+=breakcoded[i]
return stri
#Function for handling connections. This will be used to create threads
def clientthread(conn):
#Sending message to connected client
conn.send('Welcome to the server. Type something and hit enter\n') #send only takes string
#infinite loop so that function do not terminate and thread do not end.
while True:
#Receiving from client
data = conn.recv(1024)
## data=s.recv(size)
l = int (data)
#print l
coded=[]
i=0
data1=conn.recv(size)
print 'Recieved n: ',data1
n = int (data1)
data2=conn.recv(size)
print 'Recieved d: ',data2
d = int (data2)
for i in range (l):
data3=conn.recv(size)
#print 'Recieved: ',data3
print
coded.append(data3)
print 'coded string has been recieved....'
print ('coded string: ' , coded)
d= decoder(coded,d,n)
print d
reply = 'OK... your message decrypted as: ' + d
if not d:
break
conn.sendall(reply)
#came out of loop
conn.close()
#now keep talking with the client
while 1:
#wait to accept a connection - blocking call
conn, addr = s.accept()
print 'Connected with ' + addr[0] + ':' + str(addr[1])
#start new thread takes 1st argument as a function name to be run, second is the tuple of arguments to the function.
start_new_thread(clientthread ,(conn,))
s.close()
客户端：
import socket
from math import *
from random import *
host='localhost'
port=8888
size=2**16
def declare():
a = sample([5,3],2)
return (a[0],a[1])
def coder(input_message):
(p,q)=declare()
for i in range (1):
p=2**p-1
for i in range (1):
q=2**q-1
#print p
#print q
#print ("n= ",p*q)
#print a
def gcd(a,b):
if a%b==0:
return b
elif a%b > 0:
s=a%b
return gcd(b,s)
else:
raise ValueError
n=p*q
phi=(p-1)*(q-1)
e=2
while gcd(phi,e)!=1:
e+=1
d=1
while ((e*d)%phi)!=1:
d+=1
public_key=(n,e)
special_key=(n,d)
ListOfAsciis=[]
coded=[]
breakcoded=[]
for i in input_message:
ListOfAsciis.append(ord(i)-48)
for j in ListOfAsciis:
coded.append((j**e)%n)
#print ("e= ",e)
#print ("d= ",d)
#print ("coded= ",coded)
for i in coded:
breakcoded.append(chr(((i**d) % n)+48))
#print ('n= ' , n)
#print str(coded)
#print coded
return (d,n,str(coded[0]))
def decoder(codedString,d,n):
#input_d= input("please enter your private key d: ")
#input_n= input("please enter your private key n: ")
#d = int (input_d)
#n = int (input_n)
breakcoded=[]
coded=(codedString)
print coded;
for i in range (len(coded)):
breakcoded.append(chr(((int(coded[i])**d) % n)+48))
stri= ""
for i in range (len(breakcoded)):
stri+=breakcoded[i]
return stri
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print 'socket created'
s.connect((host,port))
print 'connected'
data=s.recv(size)
print 'Recieved: ', data
while True:
input_message= raw_input("please enter your message: ")
message = list(input_message)
s.send(str(len(message)))
## (p,q)=declare()
#n=p*q
(d,n,c)=coder('i')
n=str(n)
print " ",
print " ",
print " ",
print " ",
s.send(n)
print " ",
d=str(d)
s.send((d))
print " ",
print " ",
print " ",
for i in range (len(message)):
(d,n,c)=coder(input_message[i])
print " ",
print " ",
print " ",
s.send((c))
print 'coded string has been sent to the server....'
data=s.recv(size)
print 'Recieved: ', data
现在的问题是程序有时能正常工作，有时不能！在错误的情况下，服务器会通过一次 recv 接收到客户端发送的两个 send 项目。我该怎么办？