1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
from typing import Optional
from public import public
from .curve import EllipticCurve
from .point import Point
@public
class DomainParameters(object):
"""Domain parameters which specify a subgroup on an elliptic curve."""
curve: EllipticCurve
generator: Point
neutral: Point
order: int
cofactor: int
name: Optional[str]
category: Optional[str]
def __init__(self, curve: EllipticCurve, generator: Point, neutral: Point, order: int,
cofactor: int, name: Optional[str] = None, category: Optional[str] = None):
self.curve = curve
self.generator = generator
self.neutral = neutral
self.order = order
self.cofactor = cofactor
self.name = name
self.category = category
def is_neutral(self, point: Point) -> bool:
return self.neutral == point
def __eq__(self, other):
if not isinstance(other, DomainParameters):
return False
return self.curve == other.curve and self.generator == other.generator and self.neutral == other.neutral and self.order == other.order and self.cofactor == other.cofactor
def __get_name(self):
if self.name and self.category:
return f"{self.category}/{self.name}"
elif self.name:
return self.name
elif self.category:
return self.category
return ""
def __str__(self):
name = self.__get_name()
if not name:
name = str(self.curve)
return f"{self.__class__.__name__}({name})"
def __repr__(self):
return f"{self.__class__.__name__}({self.curve!r}, {self.generator!r}, {self.neutral!r}, {self.order}, {self.cofactor})"
|
