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from unittest import TestCase
from pyecsca.ec.curve import EllipticCurve
from pyecsca.ec.mod import Mod
from pyecsca.ec.model import MontgomeryModel
from pyecsca.ec.point import Point
from .curves import get_secp128r1, get_curve25519
class CurveTests(TestCase):
def setUp(self):
self.secp128r1 = get_secp128r1()
self.base = self.secp128r1.generator
self.curve25519 = get_curve25519()
def test_init(self):
with self.assertRaises(ValueError):
EllipticCurve(MontgomeryModel(), self.secp128r1.curve.coordinate_model, 1,
parameters={})
with self.assertRaises(ValueError):
EllipticCurve(self.secp128r1.curve.model, self.secp128r1.curve.coordinate_model, 15,
parameters={"c": 0})
with self.assertRaises(ValueError):
EllipticCurve(self.secp128r1.curve.model, self.secp128r1.curve.coordinate_model, 15,
parameters={"a": Mod(1, 5), "b": Mod(2, 5)})
def test_is_on_curve(self):
pt = Point(self.secp128r1.curve.coordinate_model,
X=Mod(0x161ff7528b899b2d0c28607ca52c5b86, self.secp128r1.curve.prime),
Y=Mod(0xcf5ac8395bafeb13c02da292dded7a83, self.secp128r1.curve.prime),
Z=Mod(1, self.secp128r1.curve.prime))
assert self.secp128r1.curve.is_on_curve(pt)
assert self.secp128r1.curve.is_on_curve(pt.to_affine())
other = Point(self.secp128r1.curve.coordinate_model,
X=Mod(0x161ff7528b899b2d0c28607ca52c5b86, self.secp128r1.curve.prime),
Y=Mod(0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, self.secp128r1.curve.prime),
Z=Mod(1, self.secp128r1.curve.prime))
assert not self.secp128r1.curve.is_on_curve(other)
def test_eq(self):
self.assertEqual(self.secp128r1.curve, self.secp128r1.curve)
self.assertNotEqual(self.secp128r1.curve, self.curve25519.curve)
def test_repr(self):
self.assertEqual(repr(self.secp128r1.curve),
"EllipticCurve([a=340282366762482138434845932244680310780, b=308990863222245658030922601041482374867] on ShortWeierstrassModel() using EFDCoordinateModel(\"projective\" on short Weierstrass curves))")
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