def test_decryption_invalid_mac(random_key, random_nonce, random_ciphertext,
random_mac, random_associated):
with pytest.raises(ValueError):
spectral.decrypt_disjoint(random_key, random_nonce, random_ciphertext,
random_mac[:-1], random_associated)
with pytest.raises(ValueError):
spectral.decrypt_disjoint(random_key, random_nonce, random_ciphertext,
random_mac + b"\0", random_associated)
def test_disjoint_mac(execution, random_key, random_nonce, random_plaintext,
random_associated):
ciphertext, mac = spectral.encrypt_disjoint(random_key, random_nonce,
random_plaintext,
random_associated)
mac = bytearray(mac)
flip_index = random.randint(0, len(mac) - 1)
mac[flip_index] = 255 - mac[flip_index]
mac = bytes(mac)
with pytest.raises(RuntimeError):
spectral.decrypt_disjoint(random_key, random_nonce, ciphertext, mac,
random_associated)
def test_disjoint_ciphertext(execution, random_key, random_nonce,
random_plaintext, random_associated):
ciphertext, mac = spectral.encrypt_disjoint(random_key, random_nonce,
random_plaintext,
random_associated)
ciphertext = bytearray(ciphertext)
flip_index = random.randint(0, len(ciphertext) - 1)
ciphertext[flip_index] = 255 - ciphertext[flip_index]
ciphertext = bytes(ciphertext)
with pytest.raises(RuntimeError):
spectral.decrypt_disjoint(random_key, random_nonce, ciphertext, mac,
random_associated)
def test_decryption_disjoint(random_key, random_nonce, random_plaintext,
random_associated):
ciphertext, mac = spectral.encrypt_disjoint(random_key, random_nonce,
random_plaintext,
random_associated)
assert random_plaintext == spectral.decrypt_disjoint(
random_key, random_nonce, ciphertext, mac, random_associated)
def test_decryption(cases):
for key, nonce, plaintext, associated, ciphertext, mac in cases:
key, nonce, plaintext, associated, ciphertext, mac = map(
binascii.unhexlify,
(key, nonce, plaintext, associated, ciphertext, mac))
computed_plaintext = spectral.decrypt_disjoint(key, nonce, ciphertext,
mac, associated)
assert computed_plaintext == plaintext
def test_decryption_invalid_mac_type(random_key, random_nonce,
random_ciphertext, random_associated):
with pytest.raises(TypeError):
spectral.decrypt_disjoint(random_key, random_nonce, random_ciphertext,
"", random_associated)
def test_decryption_invalid_associated(random_key, random_nonce,
random_ciphertext, random_mac):
with pytest.raises(ValueError):
spectral.decrypt_disjoint(random_key, random_nonce, random_ciphertext,
random_mac, MockedLengthBytes())