process_data.py

#!/usr/bin/python3
from arduino_inter import BS
import numpy
import pandas
import matplotlib.pyplot as plt

N_SAMPLES = 10000
MEASUREMENTS = 10_000 #7500 needed for attack to work with multi_bit

MULTI_BIT = True

class FileParser:
  def __init__(self, samples_file="captures", ct_file="ciphertext"):
    print("Reading file...")
    all_dfs = pandas.read_csv(samples_file, nrows=MEASUREMENTS * N_SAMPLES, squeeze=True, usecols=[1], header=None, names=["S", "V"], engine="c")
    print("Done")
    assert len(all_dfs) % N_SAMPLES == 0
    print("Splitting Arrays...")
    self.measurements = numpy.split(all_dfs.values, MEASUREMENTS)
    print("Done")

    self.n = len(self.measurements)

    print("Reading Ciphertext...")
    with open(ct_file, 'rb') as f:
      raw_ct = f.read()
    self.ct = [raw_ct[i * BS : (i + 1) * BS] for i in range(self.n)]
    print("Done")


inverse_sbox = [0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
                0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
                0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
                0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
                0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
                0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
                0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
                0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
                0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
                0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
                0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
                0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
                0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
                0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
                0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
                0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D]

#https://stackoverflow.com/questions/15540798/count-number-of-ones-in-a-given-integer
def h_weight(number):
  weight = 0
  while(number):
    weight += 1
    number &= number - 1
  return weight

def selector_function(ciphertext, guess, n, i):
 pre_add_roundkey = ciphertext[n] ^ guess
 #no need to reverse shift rows, sub bytes doesn't care about order
 pre_sbox = inverse_sbox[pre_add_roundkey]
 return bool(pre_sbox & 2**i)

def DPA_bytes(parser, n):
  current_samples = []
  print("0% Done", end="")

  for guess in range(256):
    if(guess % 3 == 0):
        print("\r%d%% Done" % (guess * 100 / 255), end="")
    sel_1 = numpy.zeros(N_SAMPLES)
    sel_1_cnt = 0
    sel_0 = numpy.zeros(N_SAMPLES)
    sel_0_cnt = 0

    limit = 8 if MULTI_BIT else 1

    for current_measurement in range(parser.n):
      for i in range(limit):
        if(selector_function(parser.ct[current_measurement], guess, n, i)):
            sel_1 += parser.measurements[current_measurement]
            sel_1_cnt += 1
        else:
            sel_0 += parser.measurements[current_measurement]
            sel_0_cnt += 1
    current_samples.append(sel_1 / sel_1_cnt - sel_0 / sel_0_cnt)

  print("\nDone!")

  return current_samples
     
def gen_H_con(parser, n):
  H = numpy.zeros([parser.n, 256])

  for cur_mes in range(parser.n):
    for cand_key in range(256):
      weight = h_weight(inverse_sbox[cand_key ^ parser.cs[cur_mes]])
        
      H[cur_mes][cand_key] = selector_function(parser.ct[cur_mes], cand_key, n)

def DPA(parser):
  print("Starting DPA attack on whole key (16 bytes)")
  key = []
  for byte in range(16):
    print("Attacking byte %d" % byte)
    guesses = DPA_bytes(parser, byte)
    key.append(guesses)
 
  print("DPA attack done")
  return key


def performance_eval(a):
  global MULTI_BIT
  for n in range(10_000, 0, -1000):
    print("Running with n = %d" % n)
    a.n = n

    MULTI_BIT = True
    result = DPA(a)
    numpy.save("DPA_array_%d_multi" % n, result)

    print("Running with false")

    MULTI_BIT = False
    result = DPA(a)
    numpy.save("DPA_array_%d_single" %n, result)

if(__name__ == "__main__"):
  a = FileParser()
  #b = DPA(a)
  #b = DPA_bytes(a, 14)
  #numpy.save("DPA_array", b)
  #performance_eval(a)
  a.n = 10_000
  MULTI_BIT = False
  #DPA(a)
  r = DPA_bytes(a, 0)
  plt.plot(r[177])
  plt.savefig("random.png")