(backend, wycheproof)
| 48 | "ecdh_secp521r1_test.json", |
| 49 | ) |
| 50 | def test_ecdh(backend, wycheproof): |
| 51 | curve = _CURVES[wycheproof.testgroup["curve"]] |
| 52 | if curve is None: |
| 53 | pytest.skip( |
| 54 | "Unsupported curve ({})".format(wycheproof.testgroup["curve"]) |
| 55 | ) |
| 56 | _skip_exchange_algorithm_unsupported(backend, ec.ECDH(), curve) |
| 57 | private_key = wycheproof.cache_value_to_group( |
| 58 | f"private_key_{wycheproof.testcase['private']}", |
| 59 | lambda: ec.derive_private_key( |
| 60 | int(wycheproof.testcase["private"], 16), curve |
| 61 | ), |
| 62 | ) |
| 63 | |
| 64 | try: |
| 65 | # caching these values shows no performance improvement |
| 66 | public_key = serialization.load_der_public_key( |
| 67 | binascii.unhexlify(wycheproof.testcase["public"]), backend |
| 68 | ) |
| 69 | assert isinstance(public_key, ec.EllipticCurvePublicKey) |
| 70 | except ValueError: |
| 71 | assert wycheproof.invalid or wycheproof.acceptable |
| 72 | return |
| 73 | except UnsupportedAlgorithm: |
| 74 | return |
| 75 | |
| 76 | if wycheproof.valid or wycheproof.acceptable: |
| 77 | computed_shared = private_key.exchange(ec.ECDH(), public_key) |
| 78 | expected_shared = binascii.unhexlify(wycheproof.testcase["shared"]) |
| 79 | assert computed_shared == expected_shared |
| 80 | else: |
| 81 | with pytest.raises(ValueError): |
| 82 | private_key.exchange(ec.ECDH(), public_key) |
| 83 | |
| 84 | |
| 85 | @wycheproof_tests( |
nothing calls this directly
no test coverage detected