def recieveData():
sock = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
sock.setblocking(False)
time0 = time.time()
while (time.time() - time0 < RECIEVING_WAIT_TIME):
data = sock.recv(16 + struct.calcsize(DATA_FORMAT))
if data:
tmp_cipher = AES(NODE_KEY, AES.MODE_CFB, data[:16])
data = tmp_cipher.decrypt(data[16:])
if len(data) == struct.calcsize(DATA_FORMAT):
id, node, data_seq, temp, hum, soil = struct.unpack(
DATA_FORMAT, data)
if id == ID:
sendData(temp, hum, soil)
msg = struct.pack(DATA_ACK_FORMAT, node, data_seq)
IV = getrandbits(128)
CIPHER = AES(KEY, AES.MODE_CFB, IV)
msg = IV + CIPHER.encrypt(msg)
sock.send(msg)
else:
LOG.warning('Message not mine: {} {} {} {} {}'.format(
id, node, data_seq, temp, hum, soil))
elif len(data) == struct.calcsize(SETUP_FORMAT):
id, node, data_seq = struct.unpack(SETUP_FORMAT, data)
msg = struct.pack(SETUP_ACK_FORMAT, node, ID, data_seq)
IV = getrandbits(128)
CIPHER = AES(KEY, AES.MODE_CFB, IV)
msg = IV + CIPHER.encrypt(msg)
sock.send(msg)
time.sleep_ms(50)
def _send_with_session(self, to, session, msg_type, data):
print("_send:", to._unit_addr, msg_type, session, to._counter_send,
data)
if session == None:
raise Exception('No session')
plain = bytearray()
plain.append(to._unit_addr)
plain.append(self._unit_addr)
plain.append(msg_type)
plain.extend(session)
plain.extend(struct.pack('>H', to._counter_send))
if data:
plain.append(len(data))
plain.extend(data)
else:
plain.append(0)
plain.extend(CRC.crc16(plain))
pads = (16 - (len(plain) % 16)) % 16
plain.extend(pads * '=')
print("sending:", plain)
iv = crypto.getrandbits(32)[:2]
aes = AES(self._crypto_key, AES.MODE_CBC, iv * 8)
self._sock.send(self._site_id + iv + aes.encrypt(plain))
to._counter_send = (to._counter_send + 1) % 0x10000
if to._counter_send == 0:
print("Reset after counter overflow")
to._reset_trial = 0
to._reset_next = time.ticks_ms()
def crypt(self, data):
iv = crypto.getrandbits(
128) # hardware generated random IV (never reuse it)
cipher = AES(self.key, AES.MODE_CFB, iv)
msg = iv + cipher.encrypt(data)
print(msg)
return msg
def getGateway(seq=0):
sock = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
sock.settimeout(SETUP_ACK_TIMEOUT)
msg = struct.pack(SETUP_FORMAT, BROADCAST, ID, seq)
IV = getrandbits(128)
CIPHER = AES(KEY, AES.MODE_CFB, IV)
msg = IV + CIPHER.encrypt(msg)
wait_for_ack = True
errors_count = 0
while wait_for_ack and errors_count < SETUP_ACK_RETRIES:
sock.send(msg)
try:
ack = sock.recv(16 + struct.calcsize(SETUP_ACK_FORMAT))
if len(ack):
tmp_cipher = AES(GATEWAY_KEY, AES.MODE_CFB, ack[:16])
ack = tmp_cipher.decrypt(ack[16:])
id, gateway, ack_seq = struct.unpack(SETUP_ACK_FORMAT, ack)
if id == ID and ack_seq == seq:
wait_for_ack = False
else:
LOG.warning('Recieved message not mine: {} {} {}'.format(
id, gateway, ack_seq))
except TimeoutError:
errors_count += 1
if errors_count == SETUP_ACK_RETRIES:
LOG.error('Message couldn\'t be sended. Switching off.')
sock.close()
sys.exit(-1)
else:
time.sleep(5)
time.sleep(2)
sock.close()
LOG.info('My gateway is {0}'.format(gateway))
return gateway
def sendData(data, seq):
sock = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
sock.settimeout(SETUP_ACK_TIMEOUT)
msg = struct.pack(DATA_FORMAT, GATEWAY, ID, seq, data[0], data[1], data[2])
IV = getrandbits(128)
CIPHER = AES(KEY, AES.MODE_CFB, IV)
msg = IV + CIPHER.encrypt(msg)
wait_for_ack = True
errors_count = 0
while wait_for_ack and errors_count < DATA_ACK_RETRIES:
sock.send(msg)
LOG.debug('Data sended: {} as temp, {} as hum, {} as soil hum'.format(
data[0], data[1], data[2]))
try:
ack = sock.recv(16 + struct.calcsize(DATA_ACK_FORMAT))
if len(ack):
tmp_cipher = AES(GATEWAY_KEY, AES.MODE_CFB, ack[:16])
ack = tmp_cipher.decrypt(ack[16:])
id, ack_seq = struct.unpack(DATA_ACK_FORMAT, ack)
if id == ID and ack_seq == seq:
wait_for_ack = False
LOG.info('Message sended successfully.')
else:
LOG.warning('Recieved message not mine: {} {}'.format(
id, ack_seq))
except TimeoutError:
errors_count += 1
if errors_count == DATA_ACK_RETRIES:
LOG.error('Message couldn\'t be sended. Switching off.')
sock.close()
sys.exit(-1)
else:
time.sleep(5)
time.sleep(2)
sock.close()
def sendData(self, misg):
self.s.setblocking(True)
iv = crypto.getrandbits(
128) # hardware generated random IV (never reuse it)
cipher = AES(self.key, AES.MODE_CFB, iv)
msg = iv + cipher.encrypt(misg)
self.s.send(msg)
self.s.setblocking(False)
def _encrypt(self, id, message):
gc.collect()
try:
iv = crypto.getrandbits(128)
cipher = AES(self._module['metrics'][id]['key'].encode('utf-8'), AES.MODE_CFB, iv)
return b2a_base64(iv + cipher.encrypt(message.encode('utf-8'))).decode('utf-8')
except:
print("ERROR encrypting message for metric: " + str(id) + " of sensor " + str(self._module['name']) + ". Cannot proceed!")
return None
def sendData(self,msg,rtc,f):
f=open('msg_sent_middle2.txt','a')
f.write("{}/{}/{} {}:{}:{} msg {} stats {}\n".format(rtc.now()[2],rtc.now()[1],rtc.now()[0],rtc.now()[3],rtc.now()[4],rtc.now()[5],msg,self.lora.stats()))
f.close()
self.s.setblocking(True)
iv = crypto.getrandbits(128) # hardware generated random IV (never reuse it)
cipher = AES(self.key, AES.MODE_CFB, iv)
misg_crc=msg+" "+str(self.calculate_crc(msg))
msg = iv + cipher.encrypt(misg_crc)
self.s.send(msg)
self.s.setblocking(False)
def encode(self, data):
counter = getrandbits(128)
data[self.iv_layer][-1] = counter
cipher = AES(self.enc_key, AES.MODE_CTR, None, counter)
plaintext = b""
for item in self.enc_attr_generator(data):
plaintext += item
ciphertext = cipher.encrypt(plaintext)
self.update_enc_data(data, ciphertext)
return data
def send(clearSend):
key = encryptionKey
iv = bytes(map(ord, accessToken[0:16]))
if len(clearSend) % 16 != 0:
pad = 16 - (len(clearSend) % 16)
clearSend = clearSend + (pad * chr(pad)) #pad PKCS#7
cryptor = AES(key, AES.MODE_CBC, iv)
ciphertext = cryptor.encrypt(clearSend)
toSend = binascii.b2a_base64(ciphertext)[:-1]
a = urequests.post("http://" + serverAddress + ':' + str(serverPort) +
'/exchange',
headers={
"Connection": "close",
"Content-Type": "text/plain",
"User-Agent": "iotway-product",
"Host": serverAddress,
"Authorization": "Bearer " + productId
},
data=toSend)
def encrypt(send_pkg):
cipher = AES(key, AES.MODE_CFB, iv)
send_pkg = iv + cipher.encrypt(send_pkg)
return (send_pkg)
def join_request(_sf):
global lora
global DevEUI
global lora_sock
global active_tx
global active_rx
global my_slot
global AppKey
global DevNonce
global AppSKey
rmsg = DevEUI+":"+JoinEUI+":"+str(DevNonce)+":"+str(_sf)
pkg = struct.pack(_LORA_PKG_FORMAT % len(rmsg), MY_ID, len(rmsg), rmsg)
i = 0
while (i == 0):
pycom.rgbled(blue)
lora.init(mode=LoRa.LORA, tx_iq=True, region=LoRa.EU868, frequency=freqs[0], power_mode=LoRa.TX_ONLY, bandwidth=LoRa.BW_125KHZ, sf=12, tx_power=7)
start = time.ticks_us()
# while(lora.ischannel_free(-90) == False):
# time.sleep(1)
lora_sock.send(pkg)
active_tx += time.ticks_us()-start
print("Request sent!", pkg)
time.sleep_ms(100)
lora_sock.setblocking(True)
lora.init(mode=LoRa.LORA, rx_iq=True, region=LoRa.EU868, frequency=freqs[1], power_mode=LoRa.ALWAYS_ON, bandwidth=LoRa.BW_125KHZ, sf=12)
start = time.ticks_us()
pycom.rgbled(green)
lora_sock.settimeout(5)
try:
while (True):
recv_pkg = lora_sock.recv(50)
if (len(recv_pkg) > 2):
recv_pkg_len = recv_pkg[1]
recv_pkg_id = recv_pkg[0]
if (int(recv_pkg_id) == 1):
dev_id, leng, rmsg = struct.unpack(_LORA_RCV_PKG_FORMAT % recv_pkg_len, recv_pkg)
print('Device: %d - Pkg: %s' % (dev_id, rmsg))
rmsg = str(rmsg)[2:]
rmsg = rmsg[:-1]
(dev_id, DevAddr, JoinNonce) = str(rmsg).split(":")
if (int(dev_id) == int(MY_ID)):
pycom.rgbled(blue)
lora.power_mode(LoRa.SLEEP)
active_rx += time.ticks_us()-start
start = -10000
i = 1
break
except:
if (i == 0):
lora.power_mode(LoRa.SLEEP)
active_rx += time.ticks_us()-start
random_sleep(5)
DevNonce += 1
# AppSKey generation
text = "".join( [AppKey[:2], JoinNonce, JoinEUI, str(DevNonce)] )
while (len(str(text)) < 32):
text = "".join([str(text),"0"])
encryptor = AES(AppKey, AES.MODE_ECB)
AppSKey = encryptor.encrypt(binascii.unhexlify(text))
# slot generation
text = "".join([DevAddr, DevEUI])
thash = uhashlib.sha256()
thash.update(text)
thash = int(ubinascii.hexlify(thash.digest()), 16)
my_slot = thash % S
print("Slot =", my_slot, "DevAddr = ", DevAddr)
print("joining the network lasted (s):", (time.ticks_us()-join_start)/1e6)
sync()
# First, make sure this is running on a WiPy (pycom)
try:
import pycom
from crypto import AES
except ImportError:
print("ERROR: not on a WiPy (or Pycom) board!")
sys.exit(-1)
# Setup encryption using simple, basic encryption
# NOTICE: you normally would protect this key!
my_key = b'monkeybreadyummy' # 128 bit (16 bytes) key
cipher = AES(my_key, AES.MODE_ECB)
# Create the file and encrypt the data
new_file = open("secret_log.txt", "w") # use "write" mode
new_file.write(cipher.encrypt("1,apples,2.5 \n")) # write some data
new_file.write(cipher.encrypt("2,oranges,1 \n")) # write some data
new_file.write(cipher.encrypt("3,peaches,3 \n")) # write some data
new_file.write(cipher.encrypt("4,grapes,21 \n")) # write some data
new_file.close() # close the file
# Step 2: Open the file and read data
old_file = open("secret_log.txt", "r") # use "read" mode
# Use a loop to read all rows in the file
for row in old_file.readlines():
data = cipher.decrypt(row).decode('ascii')
columns = data.strip("\n").split(",") # split row by commas
print(" : ".join(columns)) # print the row with colon separator
old_file.close()
def _crypt(self, data, key):
"""Crypt a data with the key, key.
add the iv at the beginning of the message"""
iv = crypto.getrandbits(128)
cipher = AES(key, AES.MODE_CFB, iv)
return (iv + cipher.encrypt(data))
