def test_encdec_one(self):
"""Test using values from RFC8439 section 2.3.2."""
key = bytes(range(32))
nonce = b"\x00\x00\x00\x00\x00\x00\x00\x4a\x00\x00\x00\x00"
##nonce = b"\x00\x00\x00\x09\x00\x00\x00\x4a\x00\x00\x00\x00"
counter = 1
plain_text = (b"Ladies and Gentlemen of the class of '99: If I could"
b" offer you only one tip for the future,"
b" sunscreen would be it.")
cipher_text = encrypt(plain_text,
key,
self.algo_name,
nonce=nonce,
counter=counter)
expected_cipher_text = (
b"\x6e\x2e\x35\x9a\x25\x68\xf9\x80\x41\xba\x07\x28\xdd\x0d\x69\x81"
b"\xe9\x7e\x7a\xec\x1d\x43\x60\xc2\x0a\x27\xaf\xcc\xfd\x9f\xae\x0b"
b"\xf9\x1b\x65\xc5\x52\x47\x33\xab\x8f\x59\x3d\xab\xcd\x62\xb3\x57"
b"\x16\x39\xd6\x24\xe6\x51\x52\xab\x8f\x53\x0c\x35\x9f\x08\x61\xd8"
b"\x07\xca\x0d\xbf\x50\x0d\x6a\x61\x56\xa3\x8e\x08\x8a\x22\xb6\x5e"
b"\x52\xbc\x51\x4d\x16\xcc\xf8\x06\x81\x8c\xe9\x1a\xb7\x79\x37\x36"
b"\x5a\xf9\x0b\xbf\x74\xa3\x5b\xe6\xb4\x0b\x8e\xed\xf2\x78\x5e\x42"
b"\x87\x4d")
self.assertEqual(cipher_text,
expected_cipher_text,
msg="Checking cipher text matches expected value")
decrypted_text = decrypt(cipher_text,
key,
self.algo_name,
nonce=nonce,
counter=counter)
self.assertEqual(
plain_text,
decrypted_text,
msg=
"Checking decryption of encrypted text gives original plain text")
def test_encdec_two(self):
"""Test using values approximating that from RPS game."""
key = b"TPSecret" * 4
nonce = bytearray(range(12, 0, -1))
plain_text = b"rock"
cipher_text = encrypt(plain_text, key, self.algo_name, nonce=nonce)
decrypted_text = decrypt(cipher_text, key, self.algo_name, nonce=nonce)
### It is possible for these to match but very unlikely in the general case
self.assertNotEqual(plain_text,
cipher_text,
msg="Check cipher_text is not plain_text")
self.assertEqual(
plain_text,
decrypted_text,
msg=
"Checking decryption of encrypted text gives original plain text")
d_print(2, "GC before comms", gc.mem_free())
### This sound cue is really for other players
sample.play("ready")
my_choice = CHOICES[my_choice_idx]
player_choices = [my_choice]
### Repeating key four times to make key for ChaCha20
short_key = generateOTPadKey(KEY_SIZE)
key = enlargeKey(short_key, KEY_ENLARGE)
d_print(3, "KEY", key)
plain_bytes = bytesPad(my_choice, size=8, pad=0)
cipher_bytes = encrypt(plain_bytes,
key,
CRYPTO_ALGO,
nonce=static_nonce)
enc_data_msg = RpsEncDataAdvertisement(enc_data=cipher_bytes,
round_no=round_no)
### Wait for ready sound sample to stop playing
sample.wait()
sample.play("start-tx")
sample.wait()
sample.play("txing", loop=True)
### Players will not be synchronised at this point as they do not
### have to make their choices simultaneously - much longer 12 second
### time to accomodate this
_, enc_data_by_addr, _ = broadcastAndReceive(
ble,
enc_data_msg,