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# SPDX-FileCopyrightText: Christian Amsüss and the aiocoap contributors
#
# SPDX-License-Identifier: MIT
import unittest
import aiocoap.defaults
oscore_modules = aiocoap.defaults.oscore_missing_modules()
_skip_unless_oscore = unittest.skipIf(
oscore_modules, "Modules missing for running OSCORE tests: %s" % (oscore_modules,)
)
@_skip_unless_oscore
class UtilCryptographyAdditions(unittest.TestCase):
def test(self):
from cryptography.hazmat.primitives.asymmetric import ed25519
from aiocoap.util.cryptography_additions import (
sk_to_curve25519,
pk_to_curve25519,
)
# From https://github.com/ace-wg/Hackathon-109/blob/master/GroupKeys.md and
# https://github.com/ace-wg/Hackathon-109/blob/master/GroupDerivation.md,
# private1 is Rikard Test 2 Entity 1, private2 is Rikard Test 2 Entity 2
private1 = bytes.fromhex(
"397CEB5A8D21D74A9258C20C33FC45AB152B02CF479B2E3081285F77454CF347"
)
private2 = bytes.fromhex(
"70559B9EECDC578D5FC2CA37F9969630029F1592AFF3306392AB15546C6A184A"
)
shared_reference = bytes.fromhex(
"4546babdb9482396c167af11d21953bfa49eb9f630c45de93ee4d3b9ef059576"
)
private1 = ed25519.Ed25519PrivateKey.from_private_bytes(private1)
private2 = ed25519.Ed25519PrivateKey.from_private_bytes(private2)
private1_x = sk_to_curve25519(private1)
private2_x = sk_to_curve25519(private2)
assert (
private1_x.exchange(private2_x.public_key())
== private2_x.exchange(private1_x.public_key())
== shared_reference
)
public2 = private2.public_key()
public2_x = pk_to_curve25519(public2)
assert private1_x.exchange(public2_x) == shared_reference
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