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pyUmbral
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Methods from instantiating from bytes of either original or reconstructed; introducing concept of "contents."

pull/40/head
jMyles 2018-01-18 12:58:56 -05:00
parent 0d2a697916
commit cb32627dec
1 changed files with 21 additions and 3 deletions
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24
umbral/umbral.py
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@ -143,8 +143,8 @@ class Capsule(object):
self.cfrags = {} self.cfrags = {}
self._contents = None self._contents = None
@staticmethod @classmethod
def from_bytes(data: bytes, curve: ec.EllipticCurve): def from_original_bytes(cls, data: bytes, curve: ec.EllipticCurve):
""" """
Instantiates a Capsule object from the serialized data. Instantiates a Capsule object from the serialized data.
""" """
@ -152,7 +152,25 @@ class Capsule(object):
eph_v = Point.from_bytes(data[33:66], curve) eph_v = Point.from_bytes(data[33:66], curve)
sig = BigNum.from_bytes(data[66:98], curve) sig = BigNum.from_bytes(data[66:98], curve)
return Capsule(eph_e, eph_v, sig) return cls(eph_e, eph_v, sig)
@classmethod
def from_reconstructed_bytes(cls, data: bytes, curve: ec.EllipticCurve):
"""
Instantiate a Capsule from serialized data after reconstruction has occurred.
The most obvious use case is Bob affixing at least m cFrags and then serializing the Capsule.
"""
# TODO: Seems like a job for BytestringSplitter ?
e_prime = Point.from_bytes(data[0:33], curve)
v_prime = Point.from_bytes(data[33:66], curve)
eph_ni = Point.from_bytes(data[66:99], curve)
return cls(e_prime=e_prime, v_prime=v_prime, noninteractive_point=eph_ni)
@property
def contents(self):
return self._contents
def to_bytes(self): def to_bytes(self):
""" """