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add test_keys to nail down symmetric encryption format
This establishes what our mailbox protocol does to encrypt the individual (post-SPAKE2) messages, which combines NaCl SecretBox and our own key-derivation choices. I'd like to move off of NaCl/libsodium and I think some RFC7539-implementing library might be compatible, and with these test vectors I can check that. I also want to copy these tests into the Rust port.
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from __future__ import print_function, unicode_literals | ||
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import mock | ||
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from twisted.trial import unittest | ||
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from .._key import derive_key, derive_phase_key, encrypt_data, decrypt_data | ||
from ..util import bytes_to_hexstr, hexstr_to_bytes | ||
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class Derive(unittest.TestCase): | ||
def test_derive_errors(self): | ||
self.assertRaises(TypeError, derive_key, 123, b"purpose") | ||
self.assertRaises(TypeError, derive_key, b"key", 123) | ||
self.assertRaises(TypeError, derive_key, b"key", b"purpose", "not len") | ||
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def test_derive_key(self): | ||
m = "588ba9eef353778b074413a0140205d90d7479e36e0dd4ee35bb729d26131ef1" | ||
main = hexstr_to_bytes(m) | ||
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dk1 = derive_key(main, b"purpose1") | ||
self.assertEqual(bytes_to_hexstr(dk1), | ||
"835b5df80ce9ca46908e8524fb308649" | ||
"122cfbcefbeaa7e65061c6ef08ee1b2a") | ||
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dk2 = derive_key(main, b"purpose2", 10) | ||
self.assertEqual(bytes_to_hexstr(dk2), "f2238e84315b47eb6279") | ||
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def test_derive_phase_key(self): | ||
m = "588ba9eef353778b074413a0140205d90d7479e36e0dd4ee35bb729d26131ef1" | ||
main = hexstr_to_bytes(m) | ||
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dk11 = derive_phase_key(main, "side1", "phase1") | ||
self.assertEqual(bytes_to_hexstr(dk11), | ||
"3af6a61d1a111225cc8968c6ca6265ef" | ||
"e892065c3ab46de79dda21306b062990") | ||
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dk12 = derive_phase_key(main, "side1", "phase2") | ||
self.assertEqual(bytes_to_hexstr(dk12), | ||
"88a1dd12182d989ff498022a9656d1e2" | ||
"806f17328d8bf5d8d0c9753e4381a752") | ||
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dk21 = derive_phase_key(main, "side2", "phase1") | ||
self.assertEqual(bytes_to_hexstr(dk21), | ||
"a306627b436ec23bdae3af8fa90c9ac9" | ||
"27780d86be1831003e7f617c518ea689") | ||
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dk22 = derive_phase_key(main, "side2", "phase2") | ||
self.assertEqual(bytes_to_hexstr(dk22), | ||
"bf99e3e16420f2dad33f9b1ccb0be146" | ||
"2b253d639dacdb50ed9496fa528d8758") | ||
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class Encrypt(unittest.TestCase): | ||
def test_encrypt(self): | ||
k = "ddc543ef8e4629a603d39dd0307a51bb1e7adb9cb259f6b085c91d0842a18679" | ||
key = hexstr_to_bytes(k) | ||
plaintext = hexstr_to_bytes("edc089a518219ec1cee184e89d2d37af") | ||
self.assertEqual(len(plaintext), 16) | ||
nonce = hexstr_to_bytes("2d5e43eb465aa42e750f991e425bee48" | ||
"5f06abad7e04af80") | ||
self.assertEqual(len(nonce), 24) | ||
with mock.patch("nacl.utils.random", return_value=nonce): | ||
encrypted = encrypt_data(key, plaintext) | ||
self.assertEqual(len(encrypted), 24 + 16 + 16) | ||
self.assertEqual(bytes_to_hexstr(encrypted), | ||
"2d5e43eb465aa42e750f991e425bee48" | ||
"5f06abad7e04af80fe318e39d0e4ce93" | ||
"2d2b54b300c56d2cda55ee5f0488d63e" | ||
"b1d5f76f7919a49a") | ||
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def test_decrypt(self): | ||
k = "ddc543ef8e4629a603d39dd0307a51bb1e7adb9cb259f6b085c91d0842a18679" | ||
key = hexstr_to_bytes(k) | ||
encrypted = hexstr_to_bytes("2d5e43eb465aa42e750f991e425bee48" | ||
"5f06abad7e04af80fe318e39d0e4ce93" | ||
"2d2b54b300c56d2cda55ee5f0488d63e" | ||
"b1d5f76f7919a49a") | ||
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decrypted = decrypt_data(key, encrypted) | ||
self.assertEqual(len(decrypted), len(encrypted) - 24 - 16) | ||
self.assertEqual(bytes_to_hexstr(decrypted), | ||
"edc089a518219ec1cee184e89d2d37af") |
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