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tyo.py
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tyo.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
# The modules required
import sys
import socket
import random
import string
import struct
def send_and_receive_tcp(address, port):
#Socket creation
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((address, port))
#Creation of keys
ownKeys = []
message = ("HELLO ENC\r\n") # ENC
for j in range(0,20):
randomS = [random.choice(string.hexdigits) for i in range(64)]
randomString = "".join(randomS)
message = message + randomString + "\r\n"
#ownKeys.insert(0, randomString)
ownKeys.append(randomString)
message = message + ".\r\n"
#Data transfer
s.send(message)
data = s.recv(1024)
s.close()
datalist = data.split("\r\n")
tokenAndPortList = datalist[0].split(' ')
token = tokenAndPortList[1]
udpPort = tokenAndPortList[2]
return datalist, token, udpPort, ownKeys
def send_and_receive_udp(address, port, datalist, token, ownKeys):
#Socket creation and bind
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('', int(port)))
#Variables
ack = True
eom = False
dataRemaining = 0
content = "Hello from " + token
contentLen = len(content)
#Encryption
m = 0
encryptionKey = ownKeys[m]
encryptedContent = ""
k = 0
j = 0
for i in content:
encryptedContent = encryptedContent + (chr(ord(content[k]) ^ ord(encryptionKey[j])))
j = j + 1
k = k + 1
m = m + 1
#First UDP-packet send
daatta = struct.pack('!8s??HH64s', token, ack, eom, dataRemaining, contentLen, encryptedContent)
s.sendto(daatta, (address, int(port)))
unencryptedContent = ""
#First UDP-packet receive
data, addr = s.recvfrom(2048)
token, ack, eom, dataRemaining, contentLen, encryptedContent = struct.unpack('!8s??HH64s', data)
#Decryption
l = 1
decryptionKey = datalist[l]
k = 0
j = 0
for i in range(contentLen):
unencryptedContent = unencryptedContent + (chr(ord(encryptedContent[k]) ^ ord(decryptionKey[j])))
j = j + 1
k = k + 1
l = l + 1
#Reversed order
temp = unencryptedContent.split()
temp.reverse()
reversedContent = " ".join(temp)
while True:
#Encryption
encryptionKey = ownKeys[m]
encryptedContent = ""
k = 0
j = 0
for i in reversedContent:
encryptedContent = encryptedContent + (chr(ord(reversedContent[k]) ^ ord(encryptionKey[j])))
j = j + 1
k = k + 1
m = m + 1
#Second and so on UDP-packet send
daatta = struct.pack('!8s??HH64s', token, ack, eom, dataRemaining, len(encryptedContent), encryptedContent)
s.sendto(daatta, (address, int(port)))
#Second and so on UDP-packet receive
data, addr = s.recvfrom(2048)
token, ack, eom, dataRemaining, contentLen, encryptedContent = struct.unpack('!8s??HH64s', data)
# Check if eom == True
if eom == True:
print(encryptedContent)
break
#print(encryptedContent) #remove from comments if you want to see received content
#Decryption
decryptionKey = datalist[l]
k = 0
j = 0
unencryptedContent = ""
for i in range(contentLen):
unencryptedContent = unencryptedContent + (chr(ord(encryptedContent[k]) ^ ord(decryptionKey[j])))
j = j + 1
k = k + 1
l = l + 1
#print(unencryptedContent) #remove from comments if you want to see received content
temp = unencryptedContent.split()
temp.reverse()
reversedContent = " ".join(temp)
s.close()
return
def main():
USAGE = 'usage: %s <server address> <server port>' % sys.argv[0]
try:
server_address = str(sys.argv[1])
server_tcpport = int(sys.argv[2])
data, token, udpPort, ownKeys = send_and_receive_tcp(server_address, server_tcpport)
send_and_receive_udp(server_address, udpPort, data, token, ownKeys)
except (IndexError, ValueError):
sys.exit(USAGE)
if __name__ == '__main__':
main()