def reserve_slot(self):
while True:
self.ust_lock.acquire()
self.ust.prepare()
slot_id = random.getrandbits(128)
delete_nonce = (slot_id << 128) + random.getrandbits(128)
ust_delete = UST(self.server_pk_n, self.server_pk_e)
ust_delete.prepare(delete_nonce)
args = {
"nonce": self.ust.nonce,
"signature": self.ust.signature,
"blinded_nonce": self.ust.blinded_nonce,
"slot_id": slot_id,
"blinded_deletion_nonce": ust_delete.blinded_nonce
}
r = send_request(RESERVE, args)
self.ust.receive(r['blinded_sign'])
self.ust_lock.release()
if r['success'] == True:
ust_delete.receive(r['blinded_deletion_sign'])
sig = ust_delete.signature
return slot_id, delete_nonce, sig
def add_new_server(self, server):
# Check if the server table does not have identifcal server under url
if server.url in self.server_table:
if self.server_table[server.url].equals(server):
return
self.server_table[server.url] = server
slave_ust = UST(self.server_table[server.url])
self.ust_table[server.url] = slave_ust
slave_ust.lock.acquire()
slave_ust.prepare()
ust = self.ust_table[MASTER_URL]
ust.lock.acquire()
ust.prepare()
args = {
"nonce": ust.nonce,
"signature": ust.signature,
"blinded_nonce": ust.blinded_nonce,
"blinded_slave_nonce": slave_ust.blinded_nonce,
"slave_url": server.url
}
r = send_request(MASTER_URL, CONNECT_TO_SLAVE, args)
ust.receive(r['blinded_sign'])
ust.lock.release()
slave_ust.receive(r['blinded_slave_sign'])
slave_ust.lock.release()
def reserve_slot(self):
while True:
# Consider who to resever from, master is default
ust = self.ust_table[MASTER_URL]
ust.lock.acquire()
ust.prepare()
slot_id = random.getrandbits(128)
delete_nonce = (slot_id << 128) + random.getrandbits(128)
ust_delete = UST(self.server_table[MASTER_URL])
ust_delete.prepare(delete_nonce)
args = {
"nonce": ust.nonce,
"signature": ust.signature,
"blinded_nonce": ust.blinded_nonce,
"slot_id": slot_id,
"blinded_deletion_nonce": ust_delete.blinded_nonce
}
r = send_request(MASTER_URL, RESERVE, args)
ust.receive(r['blinded_sign'])
ust.lock.release()
if r['success'] == True:
ust_delete.receive(r['blinded_deletion_sign'])
sig = ust_delete.signature
return slot_id, delete_nonce, sig
def subscribe(self):
print "Subscribing please wait..."
self.rsa = RSA_gen(4096)
self.n, self.e, self.d = RSA_keys(self.rsa)
self.ElGkey = ElGamal.generate(256, Random.new().read)
self.rsa_sign = RSA_gen(1024)
self.n_sign, self.e_sign, self.d_sign = RSA_keys(self.rsa_sign)
self.ust = UST(self.server_pk_n, self.server_pk_e)
self.ust_lock.acquire()
self.ust.prepare()
args = {
"blinded_nonce": self.ust.blinded_nonce,
"client_username": self.username,
"client_pk_n": self.n,
"client_pk_e": self.e,
"client_sign_pk_n": self.n_sign,
"client_sign_pk_e": self.e_sign
}
r = send_request(SUBSCRIBE, args)
if r == ERROR:
print "ERROR: could not subscribe"
sys.exit(0)
self.ust.receive(r['blinded_sign'])
self.ust_lock.release()
user = r['user']
if user['client_pk_n'] == self.n and user['client_pk_e'] == self.e \
and user['client_sign_pk_n'] == self.n_sign \
and user['client_sign_pk_e'] == self.e_sign:
pass
else:
print "Username is taken, please try again"
sys.exit(0)
self.user_id = user['client_user_id']
self.user_table_ptr = 0
self.client_new_conversations_table_ptr = 0
return
def subscribe(self):
print "Subscribing please wait..."
self.gen_keys()
self.ust_table[MASTER_URL] = UST(self.server_table[MASTER_URL])
ust = self.ust_table[MASTER_URL]
ust.lock.acquire()
ust.prepare()
args = {
"blinded_nonce": ust.blinded_nonce,
"client_username": self.username,
"client_pk_n": self.n,
"client_pk_e": self.e,
"client_sign_pk_n": self.n_sign,
"client_sign_pk_e": self.e_sign
}
r = send_request(MASTER_URL, SUBSCRIBE, args)
if r == ERROR:
print "ERROR: could not subscribe"
sys.exit(0)
ust.receive(r['blinded_sign'])
ust.lock.release()
user = r['user']
if user['client_pk_n'] == self.n and user['client_pk_e'] == self.e \
and user['client_sign_pk_n'] == self.n_sign \
and user['client_sign_pk_e'] == self.e_sign:
pass
else:
print "Username is taken, please try again"
sys.exit(0)
self.user_id = user['client_user_id']
self.user_table_ptr = 0
self.conversations_table_ptr = 0
print "Hello " + self.username + ", welcome to Traceless!"
return
