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Check esk using np.rseed in decrypt_using_ovk() 

Co-authored-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
therealyingtong 2021-05-27 12:56:52 +08:00
parent 83074b2628
commit 8410648f87
1 changed files with 4 additions and 4 deletions
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8
orchard_note_encryption.py
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@ -147,7 +147,7 @@ class TransmittedNoteCipherText(object):
return (note, np.memo)
def decrypt_using_ovk(self, ovk, rseed, rho, cv, cm_star):
def decrypt_using_ovk(self, ovk, rho, cv, cm_star):
# The protocol spec says to take `ephemeral_key` as input to decryption
# and to decode epk from it. That is required for consensus compatibility
# in Sapling decryption before ZIP 216, but the reverse is okay here
@ -162,8 +162,6 @@ class TransmittedNoteCipherText(object):
pk_d = Point.from_bytes(pk_d_star)
if bytes(pk_d) != pk_d_star:
return None
if OrchardKeyAgreement.esk(rseed, rho) != esk:
return None
shared_secret = OrchardKeyAgreement.agree(esk, pk_d)
ephemeral_key = bytes(self.epk)
@ -180,6 +178,8 @@ class TransmittedNoteCipherText(object):
p_enc[20:52], # rseed
p_enc[52:564], # memo
)
if OrchardKeyAgreement.esk(np.rseed, rho) != esk:
return None
g_d = diversify_hash(np.d)
note = OrchardNote(np.d, pk_d, np.v.s, rho, np.rseed)
@ -241,7 +241,7 @@ def main():
Scalar(ivk.s), rho, cm
)
(note_using_ovk, memo_using_ovk) = transmitted_note_ciphertext.decrypt_using_ovk(
sender_ovk, rseed, rho, cv, cm
sender_ovk, rho, cv, cm
)
assert(note_using_ivk == note_using_ovk)