def test_find_crc16(self):
messages = ["12345678347B", "abcdefffABBD", "cafe1337CE12"]
message_bits = [np.array(msg, dtype=np.uint8) for msg in map(util.hex2bit, messages)]
checksum_engine = ChecksumEngine(message_bits, n_gram_length=8)
result = checksum_engine.find()
self.assertEqual(len(result), 1)
checksum_range = result[0] # type: ChecksumRange
self.assertEqual(checksum_range.start, 32)
self.assertEqual(checksum_range.length, 16)
reference = GenericCRC()
reference.set_polynomial_from_hex("0x8005")
self.assertEqual(checksum_range.crc.polynomial, reference.polynomial)
self.assertEqual(checksum_range.message_indices, {0, 1, 2})
def test_find_crc32(self):
messages = ["deadcafe5D7F3F5A", "47111337E3319242", "beefaffe0DCD0E15"]
message_bits = [np.array(msg, dtype=np.uint8) for msg in map(util.hex2bit, messages)]
checksum_engine = ChecksumEngine(message_bits, n_gram_length=8)
result = checksum_engine.find()
self.assertEqual(len(result), 1)
checksum_range = result[0] # type: ChecksumRange
self.assertEqual(checksum_range.start, 32)
self.assertEqual(checksum_range.length, 32)
reference = GenericCRC()
reference.set_polynomial_from_hex("0x04C11DB7")
self.assertEqual(checksum_range.crc.polynomial, reference.polynomial)
self.assertEqual(checksum_range.message_indices, {0, 1, 2})
def test_find_crc8(self):
messages = ["aabbcc7d", "abcdee24", "dacafe33"]
message_bits = [np.array(msg, dtype=np.uint8) for msg in map(util.hex2bit, messages)]
checksum_engine = ChecksumEngine(message_bits, n_gram_length=8)
result = checksum_engine.find()
self.assertEqual(len(result), 1)
checksum_range = result[0] # type: ChecksumRange
self.assertEqual(checksum_range.length, 8)
self.assertEqual(checksum_range.start, 24)
reference = GenericCRC()
reference.set_polynomial_from_hex("0x07")
self.assertEqual(checksum_range.crc.polynomial, reference.polynomial)
self.assertEqual(checksum_range.message_indices, {0, 1, 2})