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 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 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 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 reciveData(self):
self.s.setblocking(False)
msg = self.s.recv(128) #Get any data recieved
#If there's any data, decrypt
if (len(msg) > 0):
try:
#print("encriptat: ",msg)
cipher = AES(self.key, AES.MODE_CFB,
msg[:16]) # on the decryption side
original = cipher.decrypt(msg[16:])
print("original ", original)
if "Config" in original or "stop" in original or "Discover" in original or "Hello" in original or "Info" in original or "Token" in original or "Alarm" in original:
crc_OK, msg = self.check_crc(original)
if crc_OK:
return (msg)
else:
print("CRC not OK")
return ("error")
else:
return ("error")
except Exception as e:
print(e)
return ("error")
else:
return ("error")
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 reciveData(self,rtc,f):
self.s.setblocking(False)
msg=self.s.recv(128)#Get any data recieved
#If there's any data, decrypt
if (len(msg)>0):
try:
#print("encriptat: ",msg)
cipher = AES(self.key, AES.MODE_CFB, msg[:16]) # on the decryption side
original = cipher.decrypt(msg[16:])
print("original ",original)
if "Config" in original or "stop" in original or "Discover" in original or "Hello" in original or "Info" in original or "Token" in original or "Alarm" in original or "Hay" in original:
crc_OK,msg=self.check_crc(original)
if crc_OK:
f=open('msg_received_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()
return(msg)
else:
print("CRC not OK")
return("error")
else:
return("error")
except Exception as e:
print(e)
return("error")
else:
return("error")
def decrypt(self, data):
iv = crypto.getrandbits(
128) # hardware generated random IV (never reuse it)
cipher = AES(self.key, AES.MODE_CFB,
data[:16]) # on the decryption side
original = cipher.decrypt(data[16:])
print(original)
return original
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 reciveData(self):
self.s.setblocking(False)
msg=self.s.recv(128)#Get any data recieved
#If there's any data, decrypt
if len(msg)>0:
print("encriptat: ",msg)
cipher = AES(self.key, AES.MODE_CFB, msg[:16]) # on the decryption side
original = cipher.decrypt(msg[16:])
print("original ",original)
return(original)
else:
return
def decode(self, data):
counter = data[self.iv_layer]["ctr"]
cipher = AES(self.enc_key, AES.MODE_CTR, None, counter)
ciphertext = b""
for item in self.dec_attr_generator(data):
ciphertext += item
plaintext = cipher.decrypt(ciphertext)
self.update_dec_data(data, plaintext)
return data
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 _recv(self):
while True:
p = self._sock.recv(128)
p_len = len(p)
if p_len == 0:
break
print("recv:", p)
site_id_len = len(self._site_id)
if (p_len >= (site_id_len + 16)
and p[:site_id_len] == self._site_id):
iv = p[site_id_len:2 + site_id_len] * 8
aes = AES(self._crypto_key, AES.MODE_CBC, iv)
plain = aes.decrypt(p[2 + site_id_len:])
print("plain:", plain)
to_addr = plain[0]
from_addr = plain[1]
if to_addr == from_addr:
print("Error: from == to")
return
msg_type = plain[2]
sent_session = plain[3:11]
sent_counter = struct.unpack('>H', plain[11:13])[0]
data_len = plain[13]
if data_len > 0:
data = plain[14:14 + data_len]
else:
data = None
crc = plain[14 + data_len:14 + data_len + 2]
if crc != CRC.crc16(plain[:14 + data_len]):
print("Error: crc")
return
if self._unit_addr == to_addr:
sender = self._nodes[from_addr]
if sender:
sender._lora_stats = self._lora.stats()
self._process_message(sender, msg_type, sent_session,
sent_counter, 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)
# Simple example for working with encrypting data
#
import sys
# 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
def decrypt(recv_pkg):
cipher = AES(key, AES.MODE_CFB, recv_pkg[:16]) # on the decryption side
recv_pkg = cipher.decrypt(recv_pkg[16:])
return (recv_pkg)
def encrypt(send_pkg):
cipher = AES(key, AES.MODE_CFB, iv)
send_pkg = iv + cipher.encrypt(send_pkg)
return (send_pkg)
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))
def _decrypt(self, data, key):
"""Decrypt a message"""
print(data[:16])
cipher = AES(key, AES.MODE_CFB, data[:16])
return (cipher.decrypt(data[16:]))
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()
