def encoder(input_image, output_image, input_data_file, seed):
img = Image.open(input_image) # open source image as PIL/Pillow object
hdatareader = open(input_data_file,
'rb') # open input data file to be read as a bytearray
input_data = hdatareader.read()
r, g, b, a = img.convert(
'RGBA').split() # split the color/alpha channels into individual lists
input_data_len = len(input_data) * 4 # get length of input data
print("original size of input data (in pixels used): ", input_data_len)
input_data_iter = 0
input_data_bit_iter = 0
data_len_serialized = fixedint.UInt32(input_data_len).to_bytes(
) # turn the length of the input data into a bytearray to it can be prepended to the input data during encoding
input_data = data_len_serialized + input_data # prepend the length to the input data
input_data_len = len(
input_data
) * 4 # update value to include total length of data that will be encoded
print("image mode before conversion: ", img.mode)
if input_data_len > img.width * img.height: # check if everything fits
print("input data too large")
return
print("input data will affect ", input_data_len, " of ",
img.width * img.height, "pixels in the image")
for x, y in generate_pattern(
seed, img.width, img.height, input_data_len
): # generate image x,y coordinates where bits encoded in the green and blue pixel data
encode_bits(
g, b, (x, y), input_data, input_data_iter, input_data_bit_iter
) # pass g and b color channel list, pixel coordinates, and the indexes of the byte and bits to encode
input_data_bit_iter += 2
if input_data_bit_iter > 6: # move forward to the next byte
#print(input_data[input_data_iter], end=' ')
input_data_iter += 1
input_data_bit_iter = 0
newimage = Image.merge(
'RGBA',
(r, g, b, a)) # make new image to export by combining the channels
newimage.save(output_image, 'PNG')
img.close()
newimage.close()
hdatareader.close()
def calcH(T1, e, f, g, k, m):
T1 = fixedint.UInt32(T1)
e = fixedint.UInt32(e)
f = fixedint.UInt32(f)
g = fixedint.UInt32(g)
k = fixedint.UInt32(k)
m = fixedint.UInt32(m)
return T1 - __Sigma1(e) - __Ch(e, f, g) - k - m
def calc_r(magic_token, magic_str):
for i in range(0, len(magic_str) - 2, 3):
tmp = magic_str[i + 2]
if tmp >= "a":
pos = ord(tmp[0]) - 87
else:
pos = int(tmp)
if magic_str[i + 1] == "+":
pos = magic_token >> pos
else:
pos = fixedint.UInt32(magic_token << pos)
if magic_str[i] == "+":
magic_token += pos & 4294967295
else:
magic_token ^= pos
return magic_token
def read_data(self):
# attempt counters which end transmission if too many consecutive errors occur
attempt = 0
maxAttempt = 5
samplecount = 0
start_time = time.time()
self.cancel = False
#dataWriteBuffer = []
if (self.ser == None):
self.status.config(text="Error Opening COM Port")
return
# setup and update UI
self.status.config(text="Waiting for Device Response")
self.sampleMessage.grid_forget()
self.sample.grid_forget()
self.sampleMessage = Label(self,
background="white",
text="Samples recieved:")
self.sampleMessage.grid(row=2, column=0, padx=10, sticky="W")
self.sample = Label(self, background="white", text="- ")
self.sample.grid(row=2, column=1, sticky=W)
self.parent.update()
# attempt to connect to Device
while (attempt < maxAttempt * 2):
if (
self.cancel == True
): #allow while loop to break and method to return if user cancels
self.status.config(text="Saving Canceled")
return
try:
self.parent.update()
if (self.dataType == "main"):
self.ser.write(bytes("SndData\n", encoding="ascii"))
elif (self.dataType == "CO2"):
self.ser.write(bytes("SndDataCO2\n", encoding="ascii"))
line = self.ser.readline()
line = str(line).strip("b'\\r\\n")
#print(line)
#self.parent.update()
if (line == "S"):
break
elif (line == "BADEND"):
self.status.config(text="Device Error, Try again")
return
else:
line = ""
attempt += 1
except serial.SerialTimeoutException:
attempt += 1
if (attempt >= maxAttempt * 2):
self.status.config(text="No Response from Device")
return
except serial.serialutil.SerialException:
self.status.config(text="Port Error: Check Port")
return
if (attempt >= maxAttempt):
self.status.config(text="No Response from Device")
return
#once connected, recieve data from Device
try:
#update UI messages
self.status.config(text="Saving Data")
self.parent.update()
#setup writing recieved sample count on UI
self.parent.update()
attempt = 0 #reset attempt counter
#start recieving
while (attempt < maxAttempt):
#update status messages etc
self.sample.config(text=samplecount)
self.parent.update()
if (
self.cancel == True
): #allow while loop to break and method to return if user cancels
self.status.config(text="Saving Canceled")
self.ser.write(bytes(
"END\n", encoding="ascii")) # device Sent End command
return
# reset checksum
checksum = fixedint.MutableUInt32(0)
# read line from com port
line = str(self.ser.readline()).strip("b'\\r\\n")
#print(line)
# if single sample being sent command recieved, confirm with "OK" and recieve sample
if (line == "SNGL"):
# send acknowledge
self.ser.write(bytes("OK\n", encoding="ascii"))
# read data being sent by device
data = str(self.ser.readline()).strip("b'\\r\\n")
#process data and get sent checksum to compare with
striped_data = data.split(",", 1)
recievedChecksum = fixedint.UInt32(int(striped_data[0]))
# calulate checksum for recieved data
for c in striped_data[1]:
checksum += fixedint.UInt32(ord(c))
#compare checksums. if they are the same, send acknowledge. otherwise send "RETRY" to get data resent
if (checksum == recievedChecksum):
self.filename.write(striped_data[1])
self.filename.write('\n')
self.ser.write(bytes("CHKOK\n", encoding="ascii"))
attempt = 0 #clear attempt counter if successfull
samplecount += 1 #increment counter
else:
self.ser.write(bytes("RETRY\n", encoding="ascii"))
self.status.config(text="checksum Differ!, Retrying.")
attempt += 1
# if "ENDDATA" comand recieved, all samples have been recieved and saving should stop
elif (line == "DATAEND"):
self.ser.write(bytes(
"OKEND\n", encoding="ascii")) #send acknowledge comand
#update UI
self.status.config(text="Data Saved!")
self.sample.config(text=samplecount)
self.parent.update()
print(time.time() - start_time)
return True
# if "END" command is recieved, the device terminated communication, possibly due to an error
elif (line != "END"):
self.status.config(text="Saving Data Failed")
self.cancelbutton.grid_remove()
winsound.PlaySound('SystemAsterisk',
winsound.SND_ALIAS | winsound.SND_ASYNC)
return False
# Exception handling
except self.ser.SerialTimeoutException:
self.ser.write(bytes("END\n", encoding="ascii"))
self.status.config(text="Saving Data Failed: Timeout")
winsound.PlaySound('SystemAsterisk',
winsound.SND_ALIAS | winsound.SND_ASYNC)
except Exception:
print(Exception)
#self.T.insert(END,'Error Saving\n')
self.ser.write(bytes("END\n", encoding="ascii"))
self.status.config(text="Saving Data Failed: Exception")
winsound.PlaySound('SystemAsterisk',
winsound.SND_ALIAS | winsound.SND_ASYNC)
finally:
self.filename.close()
self.ser.close()
current_sample += j
A_0_1, j = dpa.dpa_and(T[:, current_sample:], 0, A1, 2, threshold)
current_sample += j
A_0_2, j = dpa.dpa_and(T[:, current_sample:], 0, A1, 1, threshold)
current_sample += j
A_0_3, j = dpa.dpa_and(T[:, current_sample:], 0, A1, 0, threshold)
current_sample += j
A_0 = helper.byte_to_int(A_0_3, A_0_2, A_0_1, A_0_0)
if (silent != 1): print "A_0=", hex(A_0)
if (silent != 1): print 'Calculating H_0...'
# rest is pure calculation
H_0 = sha256_helper.calcH(helper.byte_to_int_array(T1[0]), E_0, F_0, G_0,
0x428a2f98L, helper.byte_to_int_array(message_0[0]))
if (silent != 1): print "H_0=", hex(H_0)
H_1 = fixedint.UInt32(G_0)
F_1 = fixedint.UInt32(E_0)
G_1 = fixedint.UInt32(F_0)
T1_1 = np.zeros([len(T1), 4], dtype=np.uint8)
for i in range(0, len(T1)):
E_tmp = fixedint.UInt32(helper.byte_to_int_array(E1[i]))
S0E1 = fixedint.UInt32(helper.byte_to_int_array(Sigma1_E1[i]))
const = fixedint.UInt32(0x71374491L)
mes = fixedint.UInt32(helper.byte_to_int_array(message_1[i]))
value = H_1 + S0E1 + sha256_helper.__Ch(E_tmp, F_1, G_1) + const + mes
T1_1[i] = helper.int_to_byte(value)
'''
* DPA 9
* C_0 equals D_1
* E_2 = D_1 +T1_2
def Sigma1(w):
value = fixedint.UInt32(helper.byte_to_int_array(w))
result = __Sigma1(value)
return helper.int_to_byte(result)
def Ch(x, y, z):
x = fixedint.UInt32(x)
y = fixedint.UInt32(y)
z = fixedint.UInt32(z)
result = __Ch(x, y, z)
return helper.int_to_byte(result)