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try:
import unittest2 as unittest
except ImportError:
import unittest
import base64
import pytest
from .curves import (
Curve,
NIST256p,
curves,
UnknownCurveError,
PRIME_FIELD_OID,
curve_by_name,
)
from .ellipticcurve import CurveFp, PointJacobi, CurveEdTw
from . import der
from .util import number_to_string
class TestParameterEncoding(unittest.TestCase):
@classmethod
def setUpClass(cls):
# minimal, but with cofactor (excludes seed when compared to
# OpenSSL output)
cls.base64_params = (
"MIHgAgEBMCwGByqGSM49AQECIQD/////AAAAAQAAAAAAAAAAAAAAAP/////////"
"//////zBEBCD/////AAAAAQAAAAAAAAAAAAAAAP///////////////AQgWsY12K"
"o6k+ez671VdpiGvGUdBrDMU7D2O848PifSYEsEQQRrF9Hy4SxCR/i85uVjpEDyd"
"wN9gS3rM6D0oTlF2JjClk/jQuL+Gn+bjufrSnwPnhYrzjNXazFezsu2QGg3v1H1"
"AiEA/////wAAAAD//////////7zm+q2nF56E87nKwvxjJVECAQE="
)
def test_from_pem(self):
pem_params = (
"-----BEGIN EC PARAMETERS-----\n"
"MIHgAgEBMCwGByqGSM49AQECIQD/////AAAAAQAAAAAAAAAAAAAAAP/////////\n"
"//////zBEBCD/////AAAAAQAAAAAAAAAAAAAAAP///////////////AQgWsY12K\n"
"o6k+ez671VdpiGvGUdBrDMU7D2O848PifSYEsEQQRrF9Hy4SxCR/i85uVjpEDyd\n"
"wN9gS3rM6D0oTlF2JjClk/jQuL+Gn+bjufrSnwPnhYrzjNXazFezsu2QGg3v1H1\n"
"AiEA/////wAAAAD//////////7zm+q2nF56E87nKwvxjJVECAQE=\n"
"-----END EC PARAMETERS-----\n"
)
curve = Curve.from_pem(pem_params)
self.assertIs(curve, NIST256p)
def test_from_pem_with_explicit_when_explicit_disabled(self):
pem_params = (
"-----BEGIN EC PARAMETERS-----\n"
"MIHgAgEBMCwGByqGSM49AQECIQD/////AAAAAQAAAAAAAAAAAAAAAP/////////\n"
"//////zBEBCD/////AAAAAQAAAAAAAAAAAAAAAP///////////////AQgWsY12K\n"
"o6k+ez671VdpiGvGUdBrDMU7D2O848PifSYEsEQQRrF9Hy4SxCR/i85uVjpEDyd\n"
"wN9gS3rM6D0oTlF2JjClk/jQuL+Gn+bjufrSnwPnhYrzjNXazFezsu2QGg3v1H1\n"
"AiEA/////wAAAAD//////////7zm+q2nF56E87nKwvxjJVECAQE=\n"
"-----END EC PARAMETERS-----\n"
)
with self.assertRaises(der.UnexpectedDER) as e:
Curve.from_pem(pem_params, ["named_curve"])
self.assertIn("explicit curve parameters not", str(e.exception))
def test_from_pem_with_named_curve_with_named_curve_disabled(self):
pem_params = (
"-----BEGIN EC PARAMETERS-----\n"
"BggqhkjOPQMBBw==\n"
"-----END EC PARAMETERS-----\n"
)
with self.assertRaises(der.UnexpectedDER) as e:
Curve.from_pem(pem_params, ["explicit"])
self.assertIn("named_curve curve parameters not", str(e.exception))
def test_from_pem_with_wrong_header(self):
pem_params = (
"-----BEGIN PARAMETERS-----\n"
"MIHgAgEBMCwGByqGSM49AQECIQD/////AAAAAQAAAAAAAAAAAAAAAP/////////\n"
"//////zBEBCD/////AAAAAQAAAAAAAAAAAAAAAP///////////////AQgWsY12K\n"
"o6k+ez671VdpiGvGUdBrDMU7D2O848PifSYEsEQQRrF9Hy4SxCR/i85uVjpEDyd\n"
"wN9gS3rM6D0oTlF2JjClk/jQuL+Gn+bjufrSnwPnhYrzjNXazFezsu2QGg3v1H1\n"
"AiEA/////wAAAAD//////////7zm+q2nF56E87nKwvxjJVECAQE=\n"
"-----END PARAMETERS-----\n"
)
with self.assertRaises(der.UnexpectedDER) as e:
Curve.from_pem(pem_params)
self.assertIn("PARAMETERS PEM header", str(e.exception))
def test_to_pem(self):
pem_params = (
b"-----BEGIN EC PARAMETERS-----\n"
b"BggqhkjOPQMBBw==\n"
b"-----END EC PARAMETERS-----\n"
)
encoding = NIST256p.to_pem()
self.assertEqual(pem_params, encoding)
def test_compare_with_different_object(self):
self.assertNotEqual(NIST256p, 256)
def test_named_curve_params_der(self):
encoded = NIST256p.to_der()
# just the encoding of the NIST256p OID (prime256v1)
self.assertEqual(b"\x06\x08\x2a\x86\x48\xce\x3d\x03\x01\x07", encoded)
def test_verify_that_default_is_named_curve_der(self):
encoded_default = NIST256p.to_der()
encoded_named = NIST256p.to_der("named_curve")
self.assertEqual(encoded_default, encoded_named)
def test_encoding_to_explicit_params(self):
encoded = NIST256p.to_der("explicit")
self.assertEqual(encoded, bytes(base64.b64decode(self.base64_params)))
def test_encoding_to_unsupported_type(self):
with self.assertRaises(ValueError) as e:
NIST256p.to_der("unsupported")
self.assertIn("Only 'named_curve'", str(e.exception))
def test_encoding_to_explicit_compressed_params(self):
encoded = NIST256p.to_der("explicit", "compressed")
compressed_base_point = (
"MIHAAgEBMCwGByqGSM49AQECIQD/////AAAAAQAAAAAAAAAAAAAAAP//////////"
"/////zBEBCD/////AAAAAQAAAAAAAAAAAAAAAP///////////////AQgWsY12Ko6"
"k+ez671VdpiGvGUdBrDMU7D2O848PifSYEsEIQNrF9Hy4SxCR/i85uVjpEDydwN9"
"gS3rM6D0oTlF2JjClgIhAP////8AAAAA//////////+85vqtpxeehPO5ysL8YyVR"
"AgEB"
)
self.assertEqual(
encoded, bytes(base64.b64decode(compressed_base_point))
)
def test_decoding_explicit_from_openssl(self):
# generated with openssl 1.1.1k using
# openssl ecparam -name P-256 -param_enc explicit -out /tmp/file.pem
p256_explicit = (
"MIH3AgEBMCwGByqGSM49AQECIQD/////AAAAAQAAAAAAAAAAAAAAAP//////////"
"/////zBbBCD/////AAAAAQAAAAAAAAAAAAAAAP///////////////AQgWsY12Ko6"
"k+ez671VdpiGvGUdBrDMU7D2O848PifSYEsDFQDEnTYIhucEk2pmeOETnSa3gZ9+"
"kARBBGsX0fLhLEJH+Lzm5WOkQPJ3A32BLeszoPShOUXYmMKWT+NC4v4af5uO5+tK"
"fA+eFivOM1drMV7Oy7ZAaDe/UfUCIQD/////AAAAAP//////////vOb6racXnoTz"
"ucrC/GMlUQIBAQ=="
)
decoded = Curve.from_der(bytes(base64.b64decode(p256_explicit)))
self.assertEqual(NIST256p, decoded)
def test_decoding_well_known_from_explicit_params(self):
curve = Curve.from_der(bytes(base64.b64decode(self.base64_params)))
self.assertIs(curve, NIST256p)
def test_decoding_with_incorrect_valid_encodings(self):
with self.assertRaises(ValueError) as e:
Curve.from_der(b"", ["explicitCA"])
self.assertIn("Only named_curve", str(e.exception))
def test_compare_curves_with_different_generators(self):
curve_fp = CurveFp(23, 1, 7)
base_a = PointJacobi(curve_fp, 13, 3, 1, 9, generator=True)
base_b = PointJacobi(curve_fp, 1, 20, 1, 9, generator=True)
curve_a = Curve("unknown", curve_fp, base_a, None)
curve_b = Curve("unknown", curve_fp, base_b, None)
self.assertNotEqual(curve_a, curve_b)
def test_default_encode_for_custom_curve(self):
curve_fp = CurveFp(23, 1, 7)
base_point = PointJacobi(curve_fp, 13, 3, 1, 9, generator=True)
curve = Curve("unknown", curve_fp, base_point, None)
encoded = curve.to_der()
decoded = Curve.from_der(encoded)
self.assertEqual(curve, decoded)
expected = "MCECAQEwDAYHKoZIzj0BAQIBFzAGBAEBBAEHBAMEDQMCAQk="
self.assertEqual(encoded, bytes(base64.b64decode(expected)))
def test_named_curve_encode_for_custom_curve(self):
curve_fp = CurveFp(23, 1, 7)
base_point = PointJacobi(curve_fp, 13, 3, 1, 9, generator=True)
curve = Curve("unknown", curve_fp, base_point, None)
with self.assertRaises(UnknownCurveError) as e:
curve.to_der("named_curve")
self.assertIn("Can't encode curve", str(e.exception))
def test_try_decoding_binary_explicit(self):
sect113r1_explicit = (
"MIGRAgEBMBwGByqGSM49AQIwEQIBcQYJKoZIzj0BAgMCAgEJMDkEDwAwiCUMpufH"
"/mSc6Fgg9wQPAOi+5NPiJgdEGIvg6ccjAxUAEOcjqxTWluZ2h1YVF1b+v4/LSakE"
"HwQAnXNhbzX0qxQH1zViwQ8ApSgwJ3lY7oTRMV7TGIYCDwEAAAAAAAAA2czsijnl"
"bwIBAg=="
)
with self.assertRaises(UnknownCurveError) as e:
Curve.from_der(base64.b64decode(sect113r1_explicit))
self.assertIn("Characteristic 2 curves unsupported", str(e.exception))
def test_decode_malformed_named_curve(self):
bad_der = der.encode_oid(*NIST256p.oid) + der.encode_integer(1)
with self.assertRaises(der.UnexpectedDER) as e:
Curve.from_der(bad_der)
self.assertIn("Unexpected data after OID", str(e.exception))
def test_decode_malformed_explicit_garbage_after_ECParam(self):
bad_der = bytes(
base64.b64decode(self.base64_params)
) + der.encode_integer(1)
with self.assertRaises(der.UnexpectedDER) as e:
Curve.from_der(bad_der)
self.assertIn("Unexpected data after ECParameters", str(e.exception))
def test_decode_malformed_unknown_version_number(self):
bad_der = der.encode_sequence(der.encode_integer(2))
with self.assertRaises(der.UnexpectedDER) as e:
Curve.from_der(bad_der)
self.assertIn("Unknown parameter encoding format", str(e.exception))
def test_decode_malformed_unknown_field_type(self):
curve_p = NIST256p.curve.p()
bad_der = der.encode_sequence(
der.encode_integer(1),
der.encode_sequence(
der.encode_oid(1, 2, 3), der.encode_integer(curve_p)
),
der.encode_sequence(
der.encode_octet_string(
number_to_string(NIST256p.curve.a() % curve_p, curve_p)
),
der.encode_octet_string(
number_to_string(NIST256p.curve.b(), curve_p)
),
),
der.encode_octet_string(
NIST256p.generator.to_bytes("uncompressed")
),
der.encode_integer(NIST256p.generator.order()),
)
with self.assertRaises(UnknownCurveError) as e:
Curve.from_der(bad_der)
self.assertIn("Unknown field type: (1, 2, 3)", str(e.exception))
def test_decode_malformed_garbage_after_prime(self):
curve_p = NIST256p.curve.p()
bad_der = der.encode_sequence(
der.encode_integer(1),
der.encode_sequence(
der.encode_oid(*PRIME_FIELD_OID),
der.encode_integer(curve_p),
der.encode_integer(1),
),
der.encode_sequence(
der.encode_octet_string(
number_to_string(NIST256p.curve.a() % curve_p, curve_p)
),
der.encode_octet_string(
number_to_string(NIST256p.curve.b(), curve_p)
),
),
der.encode_octet_string(
NIST256p.generator.to_bytes("uncompressed")
),
der.encode_integer(NIST256p.generator.order()),
)
with self.assertRaises(der.UnexpectedDER) as e:
Curve.from_der(bad_der)
self.assertIn("Prime-p element", str(e.exception))
class TestCurveSearching(unittest.TestCase):
def test_correct_name(self):
c = curve_by_name("NIST256p")
self.assertIs(c, NIST256p)
def test_openssl_name(self):
c = curve_by_name("prime256v1")
self.assertIs(c, NIST256p)
def test_unknown_curve(self):
with self.assertRaises(UnknownCurveError) as e:
curve_by_name("foo bar")
self.assertIn(
"name 'foo bar' unknown, only curves supported: "
"['NIST192p', 'NIST224p'",
str(e.exception),
)
def test_with_None_as_parameter(self):
with self.assertRaises(UnknownCurveError) as e:
curve_by_name(None)
self.assertIn(
"name None unknown, only curves supported: "
"['NIST192p', 'NIST224p'",
str(e.exception),
)
@pytest.mark.parametrize("curve", curves, ids=[i.name for i in curves])
def test_curve_params_encode_decode_named(curve):
ret = Curve.from_der(curve.to_der("named_curve"))
assert curve == ret
@pytest.mark.parametrize("curve", curves, ids=[i.name for i in curves])
def test_curve_params_encode_decode_explicit(curve):
if isinstance(curve.curve, CurveEdTw):
with pytest.raises(UnknownCurveError):
curve.to_der("explicit")
else:
ret = Curve.from_der(curve.to_der("explicit"))
assert curve == ret
@pytest.mark.parametrize("curve", curves, ids=[i.name for i in curves])
def test_curve_params_encode_decode_default(curve):
ret = Curve.from_der(curve.to_der())
assert curve == ret
@pytest.mark.parametrize("curve", curves, ids=[i.name for i in curves])
def test_curve_params_encode_decode_explicit_compressed(curve):
if isinstance(curve.curve, CurveEdTw):
with pytest.raises(UnknownCurveError):
curve.to_der("explicit", "compressed")
else:
ret = Curve.from_der(curve.to_der("explicit", "compressed"))
assert curve == ret
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