import os import shutil import subprocess import pytest from binascii import unhexlify try: import unittest2 as unittest except ImportError: import unittest from .curves import ( NIST192p, NIST224p, NIST256p, NIST384p, NIST521p, BRAINPOOLP160r1, ) from .curves import curves from .ecdh import ( ECDH, InvalidCurveError, InvalidSharedSecretError, NoKeyError, NoCurveError, ) from .keys import SigningKey, VerifyingKey from .ellipticcurve import CurveEdTw @pytest.mark.parametrize( "vcurve", curves, ids=[curve.name for curve in curves], ) def test_ecdh_each(vcurve): if isinstance(vcurve.curve, CurveEdTw): pytest.skip("ECDH is not supported for Edwards curves") ecdh1 = ECDH(curve=vcurve) ecdh2 = ECDH(curve=vcurve) ecdh2.generate_private_key() ecdh1.load_received_public_key(ecdh2.get_public_key()) ecdh2.load_received_public_key(ecdh1.generate_private_key()) secret1 = ecdh1.generate_sharedsecret_bytes() secret2 = ecdh2.generate_sharedsecret_bytes() assert secret1 == secret2 def test_ecdh_both_keys_present(): key1 = SigningKey.generate(BRAINPOOLP160r1) key2 = SigningKey.generate(BRAINPOOLP160r1) ecdh1 = ECDH(BRAINPOOLP160r1, key1, key2.verifying_key) ecdh2 = ECDH(private_key=key2, public_key=key1.verifying_key) secret1 = ecdh1.generate_sharedsecret_bytes() secret2 = ecdh2.generate_sharedsecret_bytes() assert secret1 == secret2 def test_ecdh_no_public_key(): ecdh1 = ECDH(curve=NIST192p) with pytest.raises(NoKeyError): ecdh1.generate_sharedsecret_bytes() ecdh1.generate_private_key() with pytest.raises(NoKeyError): ecdh1.generate_sharedsecret_bytes() class TestECDH(unittest.TestCase): def test_load_key_from_wrong_curve(self): ecdh1 = ECDH() ecdh1.set_curve(NIST192p) key1 = SigningKey.generate(BRAINPOOLP160r1) with self.assertRaises(InvalidCurveError) as e: ecdh1.load_private_key(key1) self.assertIn("Curve mismatch", str(e.exception)) def test_generate_without_curve(self): ecdh1 = ECDH() with self.assertRaises(NoCurveError) as e: ecdh1.generate_private_key() self.assertIn("Curve must be set", str(e.exception)) def test_load_bytes_without_curve_set(self): ecdh1 = ECDH() with self.assertRaises(NoCurveError) as e: ecdh1.load_private_key_bytes(b"\x01" * 32) self.assertIn("Curve must be set", str(e.exception)) def test_set_curve_from_received_public_key(self): ecdh1 = ECDH() key1 = SigningKey.generate(BRAINPOOLP160r1) ecdh1.load_received_public_key(key1.verifying_key) self.assertEqual(ecdh1.curve, BRAINPOOLP160r1) def test_ecdh_wrong_public_key_curve(): ecdh1 = ECDH(curve=NIST192p) ecdh1.generate_private_key() ecdh2 = ECDH(curve=NIST256p) ecdh2.generate_private_key() with pytest.raises(InvalidCurveError): ecdh1.load_received_public_key(ecdh2.get_public_key()) with pytest.raises(InvalidCurveError): ecdh2.load_received_public_key(ecdh1.get_public_key()) ecdh1.public_key = ecdh2.get_public_key() ecdh2.public_key = ecdh1.get_public_key() with pytest.raises(InvalidCurveError): ecdh1.generate_sharedsecret_bytes() with pytest.raises(InvalidCurveError): ecdh2.generate_sharedsecret_bytes() def test_ecdh_invalid_shared_secret_curve(): ecdh1 = ECDH(curve=NIST256p) ecdh1.generate_private_key() ecdh1.load_received_public_key( SigningKey.generate(NIST256p).get_verifying_key() ) ecdh1.private_key.privkey.secret_multiplier = ecdh1.private_key.curve.order with pytest.raises(InvalidSharedSecretError): ecdh1.generate_sharedsecret_bytes() # https://github.com/scogliani/ecc-test-vectors/blob/master/ecdh_kat/secp192r1.txt # https://github.com/scogliani/ecc-test-vectors/blob/master/ecdh_kat/secp256r1.txt # https://github.com/coruus/nist-testvectors/blob/master/csrc.nist.gov/groups/STM/cavp/documents/components/ecccdhtestvectors/KAS_ECC_CDH_PrimitiveTest.txt @pytest.mark.parametrize( "curve,privatekey,pubkey,secret", [ pytest.param( NIST192p, "f17d3fea367b74d340851ca4270dcb24c271f445bed9d527", "42ea6dd9969dd2a61fea1aac7f8e98edcc896c6e55857cc0" "dfbe5d7c61fac88b11811bde328e8a0d12bf01a9d204b523", "803d8ab2e5b6e6fca715737c3a82f7ce3c783124f6d51cd0", id="NIST192p-1", ), pytest.param( NIST192p, "56e853349d96fe4c442448dacb7cf92bb7a95dcf574a9bd5", "deb5712fa027ac8d2f22c455ccb73a91e17b6512b5e030e7" "7e2690a02cc9b28708431a29fb54b87b1f0c14e011ac2125", "c208847568b98835d7312cef1f97f7aa298283152313c29d", id="NIST192p-2", ), pytest.param( NIST192p, "c6ef61fe12e80bf56f2d3f7d0bb757394519906d55500949", "4edaa8efc5a0f40f843663ec5815e7762dddc008e663c20f" "0a9f8dc67a3e60ef6d64b522185d03df1fc0adfd42478279", "87229107047a3b611920d6e3b2c0c89bea4f49412260b8dd", id="NIST192p-3", ), pytest.param( NIST192p, "e6747b9c23ba7044f38ff7e62c35e4038920f5a0163d3cda", "8887c276edeed3e9e866b46d58d895c73fbd80b63e382e88" "04c5097ba6645e16206cfb70f7052655947dd44a17f1f9d5", "eec0bed8fc55e1feddc82158fd6dc0d48a4d796aaf47d46c", id="NIST192p-4", ), pytest.param( NIST192p, "beabedd0154a1afcfc85d52181c10f5eb47adc51f655047d", "0d045f30254adc1fcefa8a5b1f31bf4e739dd327cd18d594" "542c314e41427c08278a08ce8d7305f3b5b849c72d8aff73", "716e743b1b37a2cd8479f0a3d5a74c10ba2599be18d7e2f4", id="NIST192p-5", ), pytest.param( NIST192p, "cf70354226667321d6e2baf40999e2fd74c7a0f793fa8699", "fb35ca20d2e96665c51b98e8f6eb3d79113508d8bccd4516" "368eec0d5bfb847721df6aaff0e5d48c444f74bf9cd8a5a7", "f67053b934459985a315cb017bf0302891798d45d0e19508", id="NIST192p-6", ), pytest.param( NIST224p, "8346a60fc6f293ca5a0d2af68ba71d1dd389e5e40837942df3e43cbd", "af33cd0629bc7e996320a3f40368f74de8704fa37b8fab69abaae280" "882092ccbba7930f419a8a4f9bb16978bbc3838729992559a6f2e2d7", "7d96f9a3bd3c05cf5cc37feb8b9d5209d5c2597464dec3e9983743e8", id="NIST224p", ), pytest.param( NIST256p, "7d7dc5f71eb29ddaf80d6214632eeae03d9058af1fb6d22ed80badb62bc1a534", "700c48f77f56584c5cc632ca65640db91b6bacce3a4df6b42ce7cc838833d287" "db71e509e3fd9b060ddb20ba5c51dcc5948d46fbf640dfe0441782cab85fa4ac", "46fc62106420ff012e54a434fbdd2d25ccc5852060561e68040dd7778997bd7b", id="NIST256p-1", ), pytest.param( NIST256p, "38f65d6dce47676044d58ce5139582d568f64bb16098d179dbab07741dd5caf5", "809f04289c64348c01515eb03d5ce7ac1a8cb9498f5caa50197e58d43a86a7ae" "b29d84e811197f25eba8f5194092cb6ff440e26d4421011372461f579271cda3", "057d636096cb80b67a8c038c890e887d1adfa4195e9b3ce241c8a778c59cda67", id="NIST256p-2", ), pytest.param( NIST256p, "1accfaf1b97712b85a6f54b148985a1bdc4c9bec0bd258cad4b3d603f49f32c8", "a2339c12d4a03c33546de533268b4ad667debf458b464d77443636440ee7fec3" "ef48a3ab26e20220bcda2c1851076839dae88eae962869a497bf73cb66faf536", "2d457b78b4614132477618a5b077965ec90730a8c81a1c75d6d4ec68005d67ec", id="NIST256p-3", ), pytest.param( NIST256p, "207c43a79bfee03db6f4b944f53d2fb76cc49ef1c9c4d34d51b6c65c4db6932d", "df3989b9fa55495719b3cf46dccd28b5153f7808191dd518eff0c3cff2b705ed" "422294ff46003429d739a33206c8752552c8ba54a270defc06e221e0feaf6ac4", "96441259534b80f6aee3d287a6bb17b5094dd4277d9e294f8fe73e48bf2a0024", id="NIST256p-4", ), pytest.param( NIST256p, "59137e38152350b195c9718d39673d519838055ad908dd4757152fd8255c09bf", "41192d2813e79561e6a1d6f53c8bc1a433a199c835e141b05a74a97b0faeb922" "1af98cc45e98a7e041b01cf35f462b7562281351c8ebf3ffa02e33a0722a1328", "19d44c8d63e8e8dd12c22a87b8cd4ece27acdde04dbf47f7f27537a6999a8e62", id="NIST256p-5", ), pytest.param( NIST256p, "f5f8e0174610a661277979b58ce5c90fee6c9b3bb346a90a7196255e40b132ef", "33e82092a0f1fb38f5649d5867fba28b503172b7035574bf8e5b7100a3052792" "f2cf6b601e0a05945e335550bf648d782f46186c772c0f20d3cd0d6b8ca14b2f", "664e45d5bba4ac931cd65d52017e4be9b19a515f669bea4703542a2c525cd3d3", id="NIST256p-6", ), pytest.param( NIST384p, "3cc3122a68f0d95027ad38c067916ba0eb8c38894d22e1b1" "5618b6818a661774ad463b205da88cf699ab4d43c9cf98a1", "a7c76b970c3b5fe8b05d2838ae04ab47697b9eaf52e76459" "2efda27fe7513272734466b400091adbf2d68c58e0c50066" "ac68f19f2e1cb879aed43a9969b91a0839c4c38a49749b66" "1efedf243451915ed0905a32b060992b468c64766fc8437a", "5f9d29dc5e31a163060356213669c8ce132e22f57c9a04f4" "0ba7fcead493b457e5621e766c40a2e3d4d6a04b25e533f1", id="NIST384p", ), pytest.param( NIST521p, "017eecc07ab4b329068fba65e56a1f8890aa935e57134ae0ffcce802735151f4ea" "c6564f6ee9974c5e6887a1fefee5743ae2241bfeb95d5ce31ddcb6f9edb4d6fc47", "00685a48e86c79f0f0875f7bc18d25eb5fc8c0b07e5da4f4370f3a949034085433" "4b1e1b87fa395464c60626124a4e70d0f785601d37c09870ebf176666877a2046d" "01ba52c56fc8776d9e8f5db4f0cc27636d0b741bbe05400697942e80b739884a83" "bde99e0f6716939e632bc8986fa18dccd443a348b6c3e522497955a4f3c302f676", "005fc70477c3e63bc3954bd0df3ea0d1f41ee21746ed95fc5e1fdf90930d5e1366" "72d72cc770742d1711c3c3a4c334a0ad9759436a4d3c5bf6e74b9578fac148c831", id="NIST521p", ), ], ) def test_ecdh_NIST(curve, privatekey, pubkey, secret): ecdh = ECDH(curve=curve) ecdh.load_private_key_bytes(unhexlify(privatekey)) ecdh.load_received_public_key_bytes(unhexlify(pubkey)) sharedsecret = ecdh.generate_sharedsecret_bytes() assert sharedsecret == unhexlify(secret) pem_local_private_key = ( "-----BEGIN EC PRIVATE KEY-----\n" "MF8CAQEEGF7IQgvW75JSqULpiQQ8op9WH6Uldw6xxaAKBggqhkjOPQMBAaE0AzIA\n" "BLiBd9CE7xf15FY5QIAoNg+fWbSk1yZOYtoGUdzkejWkxbRc9RWTQjqLVXucIJnz\n" "bA==\n" "-----END EC PRIVATE KEY-----\n" ) der_local_private_key = ( "305f02010104185ec8420bd6ef9252a942e989043ca29f561fa525770eb1c5a00a06082a864" "8ce3d030101a13403320004b88177d084ef17f5e45639408028360f9f59b4a4d7264e62da06" "51dce47a35a4c5b45cf51593423a8b557b9c2099f36c" ) pem_remote_public_key = ( "-----BEGIN PUBLIC KEY-----\n" "MEkwEwYHKoZIzj0CAQYIKoZIzj0DAQEDMgAEuIF30ITvF/XkVjlAgCg2D59ZtKTX\n" "Jk5i2gZR3OR6NaTFtFz1FZNCOotVe5wgmfNs\n" "-----END PUBLIC KEY-----\n" ) der_remote_public_key = ( "3049301306072a8648ce3d020106082a8648ce3d03010103320004b88177d084ef17f5e4563" "9408028360f9f59b4a4d7264e62da0651dce47a35a4c5b45cf51593423a8b557b9c2099f36c" ) gshared_secret = "8f457e34982478d1c34b9cd2d0c15911b72dd60d869e2cea" def test_ecdh_pem(): ecdh = ECDH() ecdh.load_private_key_pem(pem_local_private_key) ecdh.load_received_public_key_pem(pem_remote_public_key) sharedsecret = ecdh.generate_sharedsecret_bytes() assert sharedsecret == unhexlify(gshared_secret) def test_ecdh_der(): ecdh = ECDH() ecdh.load_private_key_der(unhexlify(der_local_private_key)) ecdh.load_received_public_key_der(unhexlify(der_remote_public_key)) sharedsecret = ecdh.generate_sharedsecret_bytes() assert sharedsecret == unhexlify(gshared_secret) # Exception classes used by run_openssl. class RunOpenSslError(Exception): pass def run_openssl(cmd): OPENSSL = "openssl" p = subprocess.Popen( [OPENSSL] + cmd.split(), stdout=subprocess.PIPE, stderr=subprocess.STDOUT, ) stdout, ignored = p.communicate() if p.returncode != 0: raise RunOpenSslError( "cmd '%s %s' failed: rc=%s, stdout/err was %s" % (OPENSSL, cmd, p.returncode, stdout) ) return stdout.decode() OPENSSL_SUPPORTED_CURVES = set( c.split(":")[0].strip() for c in run_openssl("ecparam -list_curves").split("\n") ) @pytest.mark.parametrize( "vcurve", curves, ids=[curve.name for curve in curves], ) def test_ecdh_with_openssl(vcurve): if isinstance(vcurve.curve, CurveEdTw): pytest.skip("Edwards curves are not supported for ECDH") assert vcurve.openssl_name if vcurve.openssl_name not in OPENSSL_SUPPORTED_CURVES: pytest.skip("system openssl does not support " + vcurve.openssl_name) try: hlp = run_openssl("pkeyutl -help") if hlp.find("-derive") == 0: # pragma: no cover pytest.skip("system openssl does not support `pkeyutl -derive`") except RunOpenSslError: # pragma: no cover pytest.skip("system openssl could not be executed") if os.path.isdir("t"): # pragma: no branch shutil.rmtree("t") os.mkdir("t") run_openssl( "ecparam -name %s -genkey -out t/privkey1.pem" % vcurve.openssl_name ) run_openssl( "ecparam -name %s -genkey -out t/privkey2.pem" % vcurve.openssl_name ) run_openssl("ec -in t/privkey1.pem -pubout -out t/pubkey1.pem") ecdh1 = ECDH(curve=vcurve) ecdh2 = ECDH(curve=vcurve) with open("t/privkey1.pem") as e: key = e.read() ecdh1.load_private_key_pem(key) with open("t/privkey2.pem") as e: key = e.read() ecdh2.load_private_key_pem(key) with open("t/pubkey1.pem") as e: key = e.read() vk1 = VerifyingKey.from_pem(key) assert vk1.to_string() == ecdh1.get_public_key().to_string() vk2 = ecdh2.get_public_key() with open("t/pubkey2.pem", "wb") as e: e.write(vk2.to_pem()) ecdh1.load_received_public_key(vk2) ecdh2.load_received_public_key(vk1) secret1 = ecdh1.generate_sharedsecret_bytes() secret2 = ecdh2.generate_sharedsecret_bytes() assert secret1 == secret2 run_openssl( "pkeyutl -derive -inkey t/privkey1.pem -peerkey t/pubkey2.pem -out t/secret1" ) run_openssl( "pkeyutl -derive -inkey t/privkey2.pem -peerkey t/pubkey1.pem -out t/secret2" ) with open("t/secret1", "rb") as e: ssl_secret1 = e.read() with open("t/secret1", "rb") as e: ssl_secret2 = e.read() assert len(ssl_secret1) == vk1.curve.verifying_key_length // 2 assert len(secret1) == vk1.curve.verifying_key_length // 2 assert ssl_secret1 == ssl_secret2 assert secret1 == ssl_secret1