def __init__(self, curve: Curve) -> None:
from umbral.point import Point, unsafe_hash_to_point
self.curve = curve
self.CURVE_KEY_SIZE_BYTES = self.curve.field_order_size_in_bytes
self.g = Point.get_generator_from_curve(curve=curve)
g_bytes = self.g.to_bytes()
parameters_seed = b'NuCypher/UmbralParameters/'
self.u = unsafe_hash_to_point(g_bytes, self, parameters_seed + b'u')
def __init__(self, curve: ec.EllipticCurve):
from umbral.point import Point, unsafe_hash_to_point
from umbral.utils import get_curve_keysize_bytes
self.curve = curve
self.g = Point.get_generator_from_curve(self.curve)
self.order = Point.get_order_from_curve(self.curve)
g_bytes = self.g.to_bytes(is_compressed=True)
self.CURVE_MINVAL_SHA512 = (1 << 512) % int(self.order)
self.CURVE_KEY_SIZE_BYTES = get_curve_keysize_bytes(self.curve)
parameters_seed = b'NuCypherKMS/UmbralParameters/'
self.u = unsafe_hash_to_point(g_bytes, self, parameters_seed + b'u')
def test_generator_point():
"""http://www.secg.org/SEC2-Ver-1.0.pdf Section 2.7.1"""
g1 = Point.get_generator_from_curve()
g_compressed = 0x0279BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798
g_uncompressed = 0x0479BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8
g_compressed = g_compressed.to_bytes(32 + 1, byteorder='big')
g_uncompressed = g_uncompressed.to_bytes(64 + 1, byteorder='big')
g2 = Point.from_bytes(g_compressed)
assert g1 == g2
g3 = Point.from_bytes(g_uncompressed)
assert g1 == g3
assert g2 == g3
def __init__(self, curve: ec.EllipticCurve):
from umbral.point import Point, unsafe_hash_to_point
from umbral.utils import get_curve_keysize_bytes
self.curve = curve
curve_nid = backend._elliptic_curve_to_nid(curve)
self.g = Point.get_generator_from_curve(self.curve)
self.order = openssl._get_ec_order_by_curve_nid(curve_nid)
g_bytes = self.g.to_bytes(is_compressed=True)
self.CURVE_KEY_SIZE_BYTES = get_curve_keysize_bytes(self.curve)
parameters_seed = b'NuCypherKMS/UmbralParameters/'
self.u = unsafe_hash_to_point(g_bytes, self, parameters_seed + b'u')