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Improve readability of valid_kfrag_signature check

pull/128/head
David Nuñez 2018-04-24 01:18:26 +02:00
parent 12c6b5edd9
commit 4304a7da40
1 changed files with 5 additions and 2 deletions
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7
umbral/pre.py
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@ -363,10 +363,13 @@ def _verify_correctness(capsule: Capsule, cfrag: CapsuleFrag,
h = BigNum.hash_to_bn(*hash_input, params=params)
valid_kfrag_signature = z1 == BigNum.hash_to_bn(*[g_y, kfrag_id, pub_a, pub_b, u1, xcomp], params=params)
signature_input = [g_y, kfrag_id, pub_a, pub_b, u1, xcomp]
kfrag_signature1 = BigNum.hash_to_bn(*signature_input, params=params)
valid_kfrag_signature = z1 == kfrag_signature1
correct_reencryption_of_e = z3 * e == e2 + (h * e1)
correct_reencryption_of_v = z3 * v == v2 + (h * v1)
correct_rk_commitment = z3 * u == u2 + (h * u1)
correct_rk_commitment = z3 * u == u2 + (h * u1)
return valid_kfrag_signature \
& correct_reencryption_of_e \