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zcash-test-vectors
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Add diversify_hash function rather than repeating the personalization. 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2018-07-21 14:15:15 +01:00
parent 5c00456ae5
commit 61f7f70e7a
1 changed files with 5 additions and 3 deletions
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8
sapling_key_components.py
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@ -35,6 +35,8 @@ def crh_ivk(ak, nk):
ivk = digest.digest()
return leos2ip(ivk) % 2**251
def diversify_hash(d):
return group_hash(b'Zcash_gd', d)
#
# Key components
@ -82,14 +84,14 @@ class SpendingKey(object):
i = 0
while True:
d = prf_expand(self.data, bytes([3, i]))[:11]
if group_hash(b'Zcash_gd', d):
if diversify_hash(d):
return d
i += 1
assert i < 256
@cached
def default_pkd(self):
return group_hash(b'Zcash_gd', self.default_d()) * self.ivk()
return diversify_hash(self.default_d()) * self.ivk()
def main():
@ -102,7 +104,7 @@ def main():
note_r = Fr(8890123457840276890326754358439057438290574382905).exp(i+1)
note_cm = note_commit(
note_r,
leos2bsp(bytes(group_hash(b'Zcash_gd', sk.default_d()))),
leos2bsp(bytes(diversify_hash(sk.default_d()))),
leos2bsp(bytes(sk.default_pkd())),
note_v)
note_pos = (980705743285409327583205473820957432*i) % 2**MERKLE_DEPTH