receiverwithhash.py

from socket import *
import sys
import select
import hashlib

host="0.0.0.0"
port = 9999
s = socket(AF_INET,SOCK_DGRAM)
s.bind((host,port))

addr = (host,port)
buf=1024

data,addr = s.recvfrom(buf)
print "Received File:",data.strip()
f = open(data.strip(),'wb')

data,addr = s.recvfrom(buf)
try:
    while(data):
        f.write(data)
        s.settimeout(2)
        data,addr = s.recvfrom(buf)
except timeout:
    f.close()
    s.close()
    print "File Downloaded"


file_name= raw_input("Enter file name:  ")
desired_hash= raw_input("Enter desired hash:  ")
BLOCKSIZE = 65536
hasher = hashlib.sha1()
with open(file_name, 'rb') as afile:
    buf = afile.read(BLOCKSIZE)
    while len(buf) > 0:
        hasher.update(buf)
        buf = afile.read(BLOCKSIZE)
current_hash=hasher.hexdigest()
if(desired_hash==current_hash):
           print "File is intact"
else:
           print "File is broken"