server_crc.py

import socket			 
import matplotlib.pyplot as plt


def xor(a, b): 
	result = [] 
	for i in range(1, len(b)): 
		if a[i] == b[i]: 
			result.append('0') 
		else: 
			result.append('1') 

	return ''.join(result) 

def mod2div(divident, divisor): 
	pick = len(divisor) 
	tmp = divident[0 : pick] 

	while pick < len(divident): 

		if tmp[0] == '1': 
			tmp = xor(divisor, tmp) + divident[pick] 

		else: 
			tmp = xor('0'*pick, tmp) + divident[pick] 
		pick += 1

	if tmp[0] == '1': 
		tmp = xor(divisor, tmp) 
	else: 
		tmp = xor('0'*pick, tmp) 

	checkword = tmp 
	return checkword 

def encodeData(data, key): 
	l_key = len(key) 
	appended_data = data + '0'*(l_key-1) 
	remainder = mod2div(appended_data, key)
	plot1(appended_data, key) 
	codeword = data + remainder 
	return codeword	 
	
s = socket.socket()		 
port = 65432			
s.connect(('127.0.0.1', port)) 

input_string = raw_input("Enter data you want to send->") 
data =(''.join(format(ord(x), 'b') for x in input_string)) 
print(data) 
key = "1001"

ans = encodeData(data,key) 
print(ans) 
s.sendall(ans)

print(s.recv(1024)) 
s.close() 


def plot1(inp1, inp2):
    plt.title("SERVER")
    plt.ylabel("CODEWROD_snd")
    plt.plot(mod2div(inp1, inp2))