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zcash-test-vectors
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Refactor Zcash SLIP 44 coin type and the `hardened` function into a separate file, 

since they are not specific to Sapling.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2022-02-08 18:32:11 +00:00
parent cc3376f37e
commit 060ea786f7
4 changed files with 19 additions and 11 deletions
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7
zcash_test_vectors/hd_common.py Normal file
View File

@ -0,0 +1,7 @@
# Common definitions for hierarchical derivation.
ZCASH_MAIN_COINTYPE = 133
def hardened(i):
assert 0 <= i and i < (1<<31)
return i + (1<<31)

7
zcash_test_vectors/sapling/zip32.py
View File

@ -5,6 +5,8 @@ from hashlib import blake2b
from .key_components import to_scalar, prf_expand, diversify_hash, DerivedAkNk, DerivedIvk
from .generators import SPENDING_KEY_BASE, PROVING_KEY_BASE
from ..hd_common import hardened
from ..utils import i2leosp, i2lebsp, lebs2osp
from ..ff1 import ff1_aes256_encrypt
from ..output import render_args, render_tv, option, Some
@ -219,11 +221,6 @@ class ExtendedFullViewingKey(DerivedIvk, ExtendedBase):
return self.__class__(self.ak(), nk_internal, ovk_internal, dk_internal, self._c, self.depth(), self.parent_tag(), self._i)
def hardened(i):
assert(i < (1<<31))
return i + (1<<31)
def main():
args = render_args()

8
zcash_test_vectors/unified_full_viewing_keys.py
View File

@ -10,9 +10,11 @@ from .output import render_args, render_tv, Some
from .rand import Rand, randbytes
from .orchard import key_components as orchard_key_components
from .sapling import zip32 as sapling_zip32
from .hd_common import ZCASH_MAIN_COINTYPE, hardened
from .unified_encoding import encode_unified, decode_unified
from .unified_encoding import P2PKH_ITEM, SAPLING_ITEM, ORCHARD_ITEM
def main():
args = render_args()
@ -37,9 +39,9 @@ def main():
has_s_key = rand.bool()
if has_s_key:
root_key = sapling_zip32.ExtendedSpendingKey.master(seed)
purpose_key = root_key.child(sapling_zip32.hardened(32))
coin_key = purpose_key.child(sapling_zip32.hardened(133))
account_key = coin_key.child(sapling_zip32.hardened(i))
purpose_key = root_key.child(hardened(32))
coin_key = purpose_key.child(hardened(ZCASH_MAIN_COINTYPE))
account_key = coin_key.child(hardened(i))
sapling_fvk = account_key.to_extended_fvk()
sapling_fvk_bytes = b"".join([

8
zcash_test_vectors/unified_incoming_viewing_keys.py
View File

@ -10,9 +10,11 @@ from .output import render_args, render_tv, Some
from .rand import Rand, randbytes
from .orchard import key_components as orchard_key_components
from .sapling import zip32 as sapling_zip32
from .hd_common import ZCASH_MAIN_COINTYPE, hardened
from .unified_encoding import encode_unified, decode_unified
from .unified_encoding import P2PKH_ITEM, SAPLING_ITEM, ORCHARD_ITEM
def main():
args = render_args()
@ -37,9 +39,9 @@ def main():
has_s_key = rand.bool()
if has_s_key:
root_key = sapling_zip32.ExtendedSpendingKey.master(seed)
purpose_key = root_key.child(sapling_zip32.hardened(32))
coin_key = purpose_key.child(sapling_zip32.hardened(133))
account_key = coin_key.child(sapling_zip32.hardened(i))
purpose_key = root_key.child(hardened(32))
coin_key = purpose_key.child(hardened(ZCASH_MAIN_COINTYPE))
account_key = coin_key.child(hardened(i))
sapling_dk = account_key.to_extended_fvk().dk()
sapling_ivk = account_key.ivk()
sapling_ivk_bytes = bytes(sapling_dk) + bytes(sapling_ivk)