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Handling other internal umbral.pre constants with constant_sorrow

pull/220/head
David Núñez 2018-10-06 18:03:14 +02:00
parent 416c51bd0f
commit 4b662f91a8
1 changed files with 8 additions and 4 deletions
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12
umbral/pre.py
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@ -229,11 +229,13 @@ def generate_kfrags(delegating_privkey: UmbralPrivateKey,
dh_point = private_precursor * bob_pubkey_point
from constant_sorrow import constants
# Secret value 'd' allows to make Umbral non-interactive
d = CurveBN.hash(precursor,
bob_pubkey_point,
dh_point,
b"NON-INTERACTIVE",
bytes(constants.NON_INTERACTIVE),
params=params)
# Coefficients of the generating polynomial
@ -253,7 +255,7 @@ def generate_kfrags(delegating_privkey: UmbralPrivateKey,
share_index = CurveBN.hash(precursor,
bob_pubkey_point,
dh_point,
b"X-COORDINATE",
bytes(constants.X_COORDINATE),
kfrag_id,
params=params)
@ -376,12 +378,14 @@ def _decapsulate_reencrypted(receiving_privkey: UmbralPrivateKey, capsule: Capsu
precursor = capsule._attached_cfrags[0]._point_precursor
dh_point = priv_key * precursor
from constant_sorrow import constants
# Combination of CFrags via Shamir's Secret Sharing reconstruction
if len(capsule._attached_cfrags) > 1:
xs = [CurveBN.hash(precursor,
pub_key,
dh_point,
b"X-COORDINATE",
bytes(constants.X_COORDINATE),
cfrag._kfrag_id,
params=params)
for cfrag in capsule._attached_cfrags]
@ -405,7 +409,7 @@ def _decapsulate_reencrypted(receiving_privkey: UmbralPrivateKey, capsule: Capsu
d = CurveBN.hash(precursor,
pub_key,
dh_point,
b"NON-INTERACTIVE",
bytes(constants.NON_INTERACTIVE),
params=params)
e, v, s = capsule.components()