diff options
Diffstat (limited to 'pyecsca/ec/mult/base.py')
| -rw-r--r-- | pyecsca/ec/mult/base.py | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/pyecsca/ec/mult/base.py b/pyecsca/ec/mult/base.py index f7a8c5b..15f2fd5 100644 --- a/pyecsca/ec/mult/base.py +++ b/pyecsca/ec/mult/base.py @@ -87,6 +87,7 @@ class ScalarMultiplier(ABC): """All formulas the multiplier was initialized with.""" _params: DomainParameters _point: Point + _bits: int _initialized: bool = False def __init__(self, short_circuit: bool = True, **formulas: Optional[Formula]): @@ -202,7 +203,7 @@ class ScalarMultiplier(ABC): def __repr__(self): return f"{self.__class__.__name__}({', '.join(map(str, self.formulas.values()))}, short_circuit={self.short_circuit})" - def init(self, params: DomainParameters, point: Point): + def init(self, params: DomainParameters, point: Point, bits: Optional[int] = None): """ Initialize the scalar multiplier with :paramref:`~.init.params` and a :paramref:`~.init.point`. @@ -211,6 +212,8 @@ class ScalarMultiplier(ABC): :param params: The domain parameters to initialize the multiplier with. :param point: The point to initialize the multiplier with. + :param bits: The number of bits to use in the scalar multiplication (i.e. no scalar will be larger than 2^bits). + The default is the bit length of the full order of the curve (including cofactor). """ coord_model = set(self.formulas.values()).pop().coordinate_model if ( @@ -222,6 +225,7 @@ class ScalarMultiplier(ABC): ) self._params = params self._point = point + self._bits = bits if bits is not None else params.full_order.bit_length() self._initialized = True @abstractmethod |