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proxy-server.py
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proxy-server.py
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from __future__ import print_function
import socket
import os
import json
import thread
import threading
import hashlib
from util import *
import evaluator_test
import yappi
from datetime import datetime
import sys
# variables
BACKLOG = 50
MAX_DATA_RECV = 4096
count = 0
# stores all chosen tags received from sender
TAGS = []
# create lock to keep track of number
# of connections whenever new bidder joins
lock = threading.Lock()
CONN_COUNT = 0
ip_len = 0
# config of sender-server
SERVER = '127.0.0.1'
PORT = int(raw_input("Enter sender-server port number: "))
class ClientThread(threading.Thread):
def __init__(self, clientaddr, clientsocket):
threading.Thread.__init__(self)
self.client_socket = clientsocket
# blocks incrementing count for other threads
global CONN_COUNT
lock.acquire()
CONN_COUNT += 1
lock.release()
print("Connection number: ",CONN_COUNT," made at: ",clientaddr)
print("-------------------------------------")
def run(self):
# create a socket to connect to sender/server from proxy
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# TODO - Catch conn reset error
s.connect((SERVER,PORT))
# 0. Receive number of bidders in the system
# Send conn_count to sender so that sender can initialize tags
data = s.recv(MAX_DATA_RECV)
data = json.loads(data.decode())
if CONN_COUNT == 1:
global count,TAGS,ip_len
count = data.get("count")
ip_len = data.get("ip_len")
TAGS = [None]*count*ip_len
"""
VPOT Protocol
"""
data = json.dumps({"conn_count":CONN_COUNT})
s.send(data.encode())
print("Sent CONN_COUNT: {} to sender".format(CONN_COUNT))
print("-------------------------------------")
# 2. Sender sends pub_key,C, (C0,C1) and CO to proxy
data = s.recv(MAX_DATA_RECV)
data = json.loads(data.decode())
pub_key,C = data.get("pub_key"),data.get("C")
comm,CO = data.get("comm"),data.get("CO")
N = pub_key[1]
print("Received pub_key: {}, C: {}, Comm:{} CO:{} from sender".format(pub_key,C,comm,CO))
print("-------------------------------------")
# 3. Chooser receives pub_key,C from proxy
data = json.dumps({"pub_key":pub_key, "C":C})
print("Sent pub_key: {},C: {} to chooser from proxy".format(pub_key,C))
self.client_socket.send(data.encode())
print("-------------------------------------")
# 4. Chooser sends (x0,v,x) to proxy. Proxy sends (x0,v) to sender
data = self.client_socket.recv(MAX_DATA_RECV)
data = json.loads(data.decode())
x0,v,x,bid_p = data.get("x0"),data.get("v"),data.get("x"),data.get("bp")
print("Received x0: {}, v: {}, x:{}, bp:{} from sender".format(x0,v,x,bid_p))
# send (x0,v) to sender
data = json.dumps({"x0":x0, "v":v})
s.send(data.encode())
print("Sent x0:{}, v: {} to sender".format(x0,v))
# 5. Proxy receives (z0,z1),u from sender
data = s.recv(MAX_DATA_RECV)
data = json.loads(data.decode())
z0,z1,u,c = data.get("z0"),data.get("z1"),data.get("u"),data.get("c")
print("Received z0:{}, z1:{}, u:{}, c:{} from sender".format(z0,z1,u,c))
# 7. Proxy computes z0^3 and z1^3 and checks H(z0^3/x0) and
# H(z1^3/x1) are equal to 1st element of C0, C1
TAG_INT = []
for i in range(ip_len):
x1 = (C[i]*x0[i])%N
z_a = util.modular_div_util(pow(z0[i],3),x0[i],N)
z_b = util.modular_div_util(pow(z1[i],3),x1,N)
hash_z0 = hashlib.sha256(format(z_a,'b')).hexdigest()
hash_z1 = hashlib.sha256(format(z_b,'b')).hexdigest()
# print("H(z0^3/x0): ",hash_z0,"\n H(z1^3/x1): ",hash_z1)
# verifying that sender sent correct tags he had committed to - VERIFIABLE PROXY
print("-------------------------------------")
print("hash_z0 = {} hash_z1 = {} comm[i][1][0] : {} comm[i][0][0]:{}".format(hash_z0,hash_z1,comm[i][1][0],comm[i][0][0]))
if ( hash_z0 == comm[i][0][0] or hash_z0 == comm[i][1][0] ) and ( hash_z1 == comm[i][0][0] or hash_z1 == comm[i][1][0] ):
print("Verified sender tags")
else:
print("The sender isn't sending the right tags")
print("Aborting...")
os._exit(0)
print("-------------------------------------")
# FINAL : Verify c published by sender
# TODO: Verify c publshed by sender
# 7. Proxy verifies that he can use x to open C0 if c=0
# else use x to open C1 if c=1
"""
data = s.recv(MAX_DATA_RECV)
data = json.loads(data.decode())
c = int(data.get("c"))
"""
if bid_p[i]==0:
k = util.modular_div_util(z0[i],x[i],N)
else:
# print("Changed c")
# TODO: Important: Figure why c doesn't work when bp==1
k = util.modular_div_util(z1[i],x[i],N)
c[i] = 1-int(c[i])
k_hash = hashlib.sha256(format(k,'b')).hexdigest()
# DEBUG:
#print("k: {} --------- k_hash: {}".format(k,k_hash))
# print("bp: ",bp," Type bp = ",type(bp))
k_cube = pow(k,3,N)
k_cube_hash = hashlib.sha256(format(k_cube,'b')).hexdigest()
print("-------------------------------------")
# TODO: BUG: without storing comm_val
# comm[i][0][1] gives different values in next if and the one after that
if k_cube_hash == comm[i][0][0]:
comm_val = comm[i][0][1]
print("Opened C0")
# print("COMM: {} - {}".format(comm[i][0][0],comm[i][0][1]))
elif k_cube_hash == comm[i][1][0]:
comm_val = comm[i][1][1]
print("Opened C1")
# print("COMM: {} - {}".format(comm[i][1][0],comm[i][1][1]))
if c[i]==0:
#print("c:{} k_hash:{} k_hash {}-----comm {} ".format(c,k_hash,int(k_hash,16),comm[i][0][1]))
#print("COMM: ",comm[i][0][1])
tag_int = int(k_hash,16)^comm_val
else:
#print("c:{} k_hash:{} k_hash {}-----comm {} ".format(c,k_hash,int(k_hash,16),comm[i][1][1]))
#print("COMM: ",comm[i][1][1])
tag_int = int(k_hash, 16)^comm_val
TAG_INT.append(tag_int)
# DEBUG
#print("c[i]: {}, k:{} ".format(c[i],k))
#print("k:{} -------------- k_hash: {}".format(k,k_hash))
#print("comm: ",k_cube_hash)
#print("tag_int: ",tag_int)
print("-------------------------------------")
tag = gc_util.decode_str(tag_int)
lock.acquire()
last_index = (ip_len*CONN_COUNT)-1
TAGS[last_index-ip_len+i+1] = tag
#print("TAGS[{}] = {}".format(CONN_COUNT-1,TAGS[CONN_COUNT-1]))
#print("Added tags: i:{} count:{}".format(i,CONN_COUNT))
lock.release()
#print("TAGS: ",TAGS)
# ------ EVALUATION ------
if i==ip_len-1 and CONN_COUNT == count:
#print("Inside evaluation i: {} count: {}".format(i,CONN_COUNT))
#print("Inputs to circuit: {}".format(TAGS))
yappi.start()
print(mycirc.fire(TAGS))
func_stats = yappi.get_func_stats().print_all()
# func_stats.save('callgrind.out.' + datetime.now().isoformat(), 'CALLGRIND')
yappi.stop()
yappi.clear_stats()
data = json.dumps({"tag_int":TAG_INT})
self.client_socket.send(data.encode())
print("Sent tag_int: {} to bidder".format(TAG_INT))
server.close()
print("Shutting down...")
os._exit(0)
print("-------------------------------------")
data = json.dumps({"tag_int":TAG_INT})
self.client_socket.send(data.encode())
print("Sent tag_int: {} to bidder".format(TAG_INT))
print("-------------------------------------")
"""
# ------ EVALUATION ------
if count == CONN_COUNT:
print("Inputs to circuit: {}".format(TAGS))
print(mycirc.fire(TAGS))
server.close()
print("Shutting down...")
os._exit(0)
"""
print("Server at {} disconnected".format(clientaddr))
print("-------------------------------------")
s.close()
# ------- EVALUATOR --------
if __name__ == "__main__":
with open('test/garbled_circuit.json') as data_file:
data = json.load(data_file)
mycirc = evaluator_test.Circuit(data)
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR,1)
server.bind(('',0))
print("Proxy server started at ", server.getsockname())
while True:
try:
server.listen(BACKLOG)
clientsock, clientaddr = server.accept()
newthread = ClientThread(clientaddr, clientsock)
newthread.start()
except KeyboardInterrupt:
print("Shutting down.....")
exit(0)