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()