def get_address_mac(address: str, slip44: int, keychain: Keychain) -> bytes:
# k = Key(m/"SLIP-0024"/"Address MAC key")
node = keychain.derive_slip21(_ADDRESS_MAC_KEY_PATH)
# mac = HMAC-SHA256(key = k, msg = slip44 || address)
mac = utils.HashWriter(hmac(hmac.SHA256, node.key()))
address_bytes = address.encode()
write_uint32_le(mac, slip44)
write_compact_size(mac, len(address_bytes))
write_bytes_unchecked(mac, address_bytes)
return mac.get_digest()
def test_slip21(self):
seed = bip39.seed(' '.join(['all'] * 12), '')
node1 = Slip21Node(seed)
node2 = node1.clone()
keychain = Keychain(seed, "", [], slip21_namespaces=[[b"SLIP-0021"]])
# Key(m)
KEY_M = unhexlify(
b"dbf12b44133eaab506a740f6565cc117228cbf1dd70635cfa8ddfdc9af734756"
)
self.assertEqual(node1.key(), KEY_M)
# Key(m/"SLIP-0021")
KEY_M_SLIP0021 = unhexlify(
b"1d065e3ac1bbe5c7fad32cf2305f7d709dc070d672044a19e610c77cdf33de0d"
)
node1.derive_path([b"SLIP-0021"])
self.assertEqual(node1.key(), KEY_M_SLIP0021)
self.assertEqual(
keychain.derive_slip21([b"SLIP-0021"]).key(), KEY_M_SLIP0021)
# Key(m/"SLIP-0021"/"Master encryption key")
KEY_M_SLIP0021_MEK = unhexlify(
b"ea163130e35bbafdf5ddee97a17b39cef2be4b4f390180d65b54cf05c6a82fde"
)
node1.derive_path([b"Master encryption key"])
self.assertEqual(node1.key(), KEY_M_SLIP0021_MEK)
self.assertEqual(
keychain.derive_slip21([b"SLIP-0021",
b"Master encryption key"]).key(),
KEY_M_SLIP0021_MEK)
# Key(m/"SLIP-0021"/"Authentication key")
KEY_M_SLIP0021_AK = unhexlify(
b"47194e938ab24cc82bfa25f6486ed54bebe79c40ae2a5a32ea6db294d81861a6"
)
node2.derive_path([b"SLIP-0021", b"Authentication key"])
self.assertEqual(node2.key(), KEY_M_SLIP0021_AK)
self.assertEqual(
keychain.derive_slip21([b"SLIP-0021",
b"Authentication key"]).key(),
KEY_M_SLIP0021_AK)
# Forbidden paths.
with self.assertRaises(wire.DataError):
keychain.derive_slip21([])
with self.assertRaises(wire.DataError):
keychain.derive_slip21([b"SLIP-9999", b"Authentication key"])
def get_identifier(script_pubkey: bytes, keychain: Keychain) -> bytes:
# k = Key(m/"SLIP-0019"/"Ownership identification key")
node = keychain.derive_slip21(_OWNERSHIP_ID_KEY_PATH)
# id = HMAC-SHA256(key = k, msg = scriptPubKey)
return hmac(hmac.SHA256, node.key(), script_pubkey).digest()
