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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
order: int
cofactor: int
name: Optional[str]
category: Optional[str]
def __init__(self, curve: EllipticCurve, generator: Point, order: int,
cofactor: int, name: Optional[str] = None, category: Optional[str] = None):
self.curve = curve
self.generator = generator
self.order = order
self.cofactor = cofactor
self.name = name
self.category = category
def __eq__(self, other):
if not isinstance(other, DomainParameters):
return False
return self.curve == other.curve and self.generator == other.generator 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.order}, {self.cofactor})"
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