def test_reverse_engineering(self): c = GenericCRC(polynomial="16_standard", start_value=False, final_xor=False, reverse_polynomial=False, reverse_all=False, lsb_first=False, little_endian=False) bitstring_set = [ "1110001111001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010", "1110010011001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010", "1110010111001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010", "1110011011001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010" ] bitset = [] crcset = [] for i in bitstring_set: tmp = c.str2bit(i) bitset.append(tmp) crcset.append(c.crc(tmp)) polynomial = c.reverse_engineer_polynomial(bitset, crcset) if polynomial: self.assertEqual(c.bit2str(polynomial), "1000000000000101") self.assertEqual(util.bit2hex(polynomial), "8005")
def test_guess_standard_parameters_and_datarange(self): c = GenericCRC(polynomial="16_ccitt", start_value=False, final_xor=False, reverse_polynomial=False, reverse_all=False, lsb_first=False, little_endian=False) inpt = "101010101010101010000000111000000000000011100000001011010010110100000000111000000101001010000100000000000100111001111110010000000011011111111001001101100001100010100000000000111011110100010" vrfy_crc = "0011101111010001" result = c.guess_standard_parameters_and_datarange(c.str2arr(inpt), c.str2arr(vrfy_crc)) self.assertEqual(result, (2, 84, 172)) self.assertEqual(vrfy_crc, c.bit2str(c.crc(c.str2arr(inpt[result[1]:result[2]]))))
def test_reverse_engineering(self): c = GenericCRC(polynomial="16_standard", start_value=False, final_xor=False, reverse_polynomial=False, reverse_all=False, lsb_first=False, little_endian=False) bitstring_set = [ "1110001111001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010", "1110010011001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010", "1110010111001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010", "1110011011001011100010000101010100000010110111000101100010100100111110111101100110110111011001010010001011101010"] bitset = [] crcset = [] for i in bitstring_set: tmp = c.str2bit(i) bitset.append(tmp) crcset.append(c.crc(tmp)) # print(c.guess_standard_parameters(bitset[0], crcset[0])) polynomial = c.reverse_engineer_polynomial(bitset, crcset) if polynomial: self.assertEqual(c.bit2str(polynomial), "1000000000000101") self.assertEqual(util.bit2hex(polynomial), "8005")