def server():
host = socket.gethostname()
port = 7000
server_socket = socket.socket()
server_socket.bind((host, port)) # bind host address and port together
server_socket.listen(3)
print("...............server is listening...............")
while True:
conn, address = server_socket.accept()
print("server connected to: "+ str(address))
data=conn.recv(2048).decode()
data = data.split("$$")
ticket = data[0]
autheticator = data[1]
ticket = decryption(server_key,base64.b64decode(ticket))
ticket = ticket.split("$$")
key_c_v = ticket[0]
time = decryption(key_c_v , base64.b64decode(autheticator)).split("$$")
print(time)
message = encryption(key_c_v,time[-1])
conn.send(message)
conn.close()
def connect_to_tgs(key_c_tgs, ticket):
host = socket.gethostname()
port = 6000 #server port
client_socket = socket.socket()
client_socket.connect((host, port))
print("...............connection established................")
id_client = "1"
id_server = "4"
ts3 = datetime.datetime.now()
#create authenticator
auth = encryption(key_c_tgs, id_client + "$$" + str(ts3))
message = id_server + "$$" + ticket + "$$" + str(auth)
message = message.encode()
client_socket.send(message)
data = client_socket.recv(2024)
data = decryption(key_c_tgs, data)
data = data.split("$$")
key_c_v = data[0]
print(key_c_v)
ticket_v = data[-1]
print(ticket_v)
return key_c_v, ticket_v
def decryptionECB(key, ciphertext): cipher = tl.h2b(ciphertext[0]) result = "" for x in xrange(0, (len(cipher)/64)): result += aes.decryption(key, cipher[(x*64):(x*64+64)]) result = tl.unPadding(result, ciphertext[1]) return result
def decryptionCBC(key,ciphertext,iv): hexCipher = tl.h2b(ciphertext[0]) count = len(tl.h2b(ciphertext[0]))/64 plain = '' for i in xrange(0,count,1): c = tl.h2b(aes.decryption(key,hexCipher[i*64:(i*64)+64])) p = tl.b2h(tl.xor(c,iv)) iv = hexCipher[i*64:(i*64)+64] plain += p plain = tl.unPadding(plain, ciphertext[1]) return plain
def connect_to_v(key_c_v, ticket):
host = socket.gethostname()
port = 7000 #server port
client_socket = socket.socket()
client_socket.connect((host, port))
print("...............connection established................")
authenticator, time1 = make_authenticator(key_c_v)
authenticator = str(base64.b64encode(authenticator), "utf-8")
message = ticket + "$$" + authenticator
client_socket.send(message.encode())
data = client_socket.recv(2024)
time2 = decryption(key_c_v, data)
print("hey:", time1)
print(time2)
if time1 == time2:
print("connected to right server")
def connect_to_as():
host = socket.gethostname()
port = 5000 #server port
client_socket = socket.socket()
client_socket.connect((host, port))
print("...............connection established................")
id_client = "1"
id_tgt = "3"
time = datetime.datetime.now()
message = id_client + "$$" + id_tgt + "$$" + str(time)
message = message.encode()
client_socket.send(message)
data = client_socket.recv(2024)
data = decryption(client_key, data)
data = data.split("$$")
key_c_tgs = data[0]
print(key_c_tgs)
ticket = data[-1]
print(ticket)
return key_c_tgs, ticket
