Get Decred account key from seed.

basicswap/basicswap.py

@@ -502,7 +502,9 @@ class BasicSwap(BaseApp):
             self.coin_clients[Coins.LTC_MWEB] = self.coin_clients[coin]
 
         if self.coin_clients[coin]['connection_type'] == 'rpc':
-            if coin == Coins.XMR:
+            if coin == Coins.DCR:
+                self.coin_clients[coin]['walletrpcport'] = chain_client_settings['walletrpcport']
+            elif coin == Coins.XMR:
                 self.coin_clients[coin]['rpctimeout'] = chain_client_settings.get('rpctimeout', 60)
                 self.coin_clients[coin]['walletrpctimeout'] = chain_client_settings.get('walletrpctimeout', 120)
                 self.coin_clients[coin]['walletrpctimeoutlong'] = chain_client_settings.get('walletrpctimeoutlong', 600)

basicswap/interface/btc.py

@@ -38,6 +38,7 @@ from basicswap.util.address import (
     pubkeyToAddress,
 )
 from basicswap.util.crypto import (
+    hash160,
     sha256,
 )
 from coincurve.keys import (
@@ -70,8 +71,7 @@ from basicswap.contrib.test_framework.script import (
     OP_DROP,
     OP_HASH160, OP_EQUAL,
     SIGHASH_ALL,
-    SegwitV0SignatureHash,
-    hash160)
+    SegwitV0SignatureHash)
 
 from basicswap.basicswap_util import (
     TxLockTypes)

basicswap/interface/dcr/dcr.py

@@ -5,6 +5,8 @@
 # Distributed under the MIT software license, see the accompanying
 # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 
+import logging
+
 from basicswap.chainparams import Coins
 from basicswap.interface.btc import Secp256k1Interface
 from basicswap.util.address import (
@@ -13,8 +15,10 @@ from basicswap.util.address import (
 )
 from basicswap.util.crypto import (
     blake256,
+    hash160,
     ripemd160,
 )
+from basicswap.util.extkey import ExtKeyPair
 from basicswap.interface.dcr.rpc import make_rpc_func
 
 
@@ -45,7 +49,15 @@ class DCRInterface(Secp256k1Interface):
         self._rpc_host = coin_settings.get('rpchost', '127.0.0.1')
         self._rpcport = coin_settings['rpcport']
         self._rpcauth = coin_settings['rpcauth']
+        self._sc = swap_client
+        self._log = self._sc.log if self._sc and self._sc.log else logging
         self.rpc = make_rpc_func(self._rpcport, self._rpcauth, host=self._rpc_host)
+        if 'walletrpcport' in coin_settings:
+            self.rpc_wallet = make_rpc_func(coin_settings['walletrpcport'], self._rpcauth, host=self._rpc_host)
+        else:
+            self.rpc_wallet = None
+
+        self._use_segwit = coin_settings['use_segwit']
 
     def pkh(self, pubkey: bytes) -> bytes:
         return ripemd160(blake256(pubkey))
@@ -69,6 +81,41 @@ class DCRInterface(Secp256k1Interface):
 
     def testDaemonRPC(self, with_wallet=True) -> None:
         if with_wallet:
-            self.rpc_wallet('getwalletinfo')
+            self.rpc_wallet('getinfo')
         else:
             self.rpc('getblockchaininfo')
+
+    def checkWallets(self) -> int:
+        # Only one wallet possible?
+        return 1
+
+    def initialiseWallet(self, key: bytes) -> None:
+        # Load with --create
+        pass
+
+    def getDaemonVersion(self):
+        return self.rpc('getnetworkinfo')['version']
+
+    def getBlockchainInfo(self):
+        return self.rpc('getblockchaininfo')
+
+    def using_segwit(self) -> bool:
+        return self._use_segwit
+
+    def getWalletInfo(self):
+        rv = self.rpc_wallet('getinfo')
+        return rv
+
+    def getSeedHash(self, seed: bytes) -> bytes:
+        # m / purpose' / coin_type' / account' / change / address_index
+        # m/44'/coin_type'/0'/0/0
+
+        ek = ExtKeyPair(self.coin_type())
+        ek.set_seed(seed)
+
+        coin_type = self.chainparams_network()['bip44']
+        ek_purpose = ek.derive(44 | (1 << 31))
+        ek_coin = ek_purpose.derive(coin_type | (1 << 31))
+        ek_account = ek_coin.derive(0 | (1 << 31))
+
+        return hash160(ek_account.encode_p())

basicswap/interface/dcr/rpc.py

@@ -16,7 +16,6 @@ def callrpc(rpc_port, auth, method, params=[], host='127.0.0.1'):
         x.__handler = None
         v = x.json_request(method, params)
         x.close()
-        print('[rm] v', v)
         r = json.loads(v.decode('utf-8'))
     except Exception as ex:
         traceback.print_exc()

basicswap/interface/nav.py

@@ -76,11 +76,11 @@ class NAVInterface(BTCInterface):
         # p2sh-p2wsh
         return True
 
-    def seedToMnemonic(self, key):
+    def seedToMnemonic(self, key: bytes) -> None:
         return Mnemonic('english').to_mnemonic(key)
 
     def initialiseWallet(self, key):
-        # load with -importmnemonic= parameter
+        # Load with -importmnemonic= parameter
         pass
 
     def getWalletSeedID(self):

basicswap/interface/part.py

@@ -93,7 +93,7 @@ class PARTInterface(BTCInterface):
         index_info = self.rpc('getinsightinfo' if int(str(version)[:2]) > 19 else 'getindexinfo')
         return index_info['spentindex']
 
-    def initialiseWallet(self, key):
+    def initialiseWallet(self, key: bytes) -> None:
         raise ValueError('TODO')
 
     def withdrawCoin(self, value, addr_to, subfee):

basicswap/interface/xmr.py

@@ -156,7 +156,7 @@ class XMRInterface(CoinInterface):
             pass
         self.rpc_wallet('open_wallet', params)
 
-    def initialiseWallet(self, key_view, key_spend, restore_height=None):
+    def initialiseWallet(self, key_view: bytes, key_spend: bytes, restore_height=None) -> None:
         with self._mx_wallet:
             try:
                 self.openWallet(self._wallet_filename)

basicswap/util/address.py

@@ -90,7 +90,7 @@ def getKeyID(key_data: bytes) -> bytes:
     return ripemd160(sha256(key_data))
 
 
-def bech32Decode(hrp, addr):
+def bech32Decode(hrp: str, addr: str) -> bytes:
     hrpgot, data = bech32_decode(addr)
     if hrpgot != hrp:
         return None
@@ -100,14 +100,14 @@ def bech32Decode(hrp, addr):
     return bytes(decoded)
 
 
-def bech32Encode(hrp, data):
+def bech32Encode(hrp: str, data: bytes) -> str:
     ret = bech32_encode(hrp, convertbits(data, 8, 5))
     if bech32Decode(hrp, ret) is None:
         return None
     return ret
 
 
-def decodeAddress(address: str):
+def decodeAddress(address: str) -> bytes:
     addr_data = b58decode(address)
     if addr_data is None:
         return None

basicswap/util/crypto.py

@@ -4,9 +4,10 @@
 # Distributed under the MIT software license, see the accompanying
 # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 
-from Crypto.Hash import RIPEMD160, SHA256  # pycryptodome
 from basicswap.contrib.blake256.blake256 import blake_hash
 
+from Crypto.Hash import HMAC, RIPEMD160, SHA256, SHA512  # pycryptodome
+
 
 def sha256(data: bytes) -> bytes:
     h = SHA256.new()
@@ -14,6 +15,12 @@ def sha256(data: bytes) -> bytes:
     return h.digest()
 
 
+def sha512(data: bytes) -> bytes:
+    h = SHA512.new()
+    h.update(data)
+    return h.digest()
+
+
 def ripemd160(data: bytes) -> bytes:
     h = RIPEMD160.new()
     h.update(data)
@@ -24,5 +31,11 @@ def blake256(data: bytes) -> bytes:
     return blake_hash(data)
 
 
-def hash160(s: bytes) -> bytes:
-    return ripemd160(sha256(s))
+def hash160(data: bytes) -> bytes:
+    return ripemd160(sha256(data))
+
+
+def hmac_sha512(secret: bytes, data: bytes) -> bytes:
+    h = HMAC.new(secret, digestmod=SHA512)
+    h.update(data)
+    return h.digest()

basicswap/util/extkey.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2024 tecnovert
+# Distributed under the MIT software license, see the accompanying
+# file LICENSE or http://www.opensource.org/licenses/mit-license.php.
+
+from .crypto import blake256, hash160, hmac_sha512, ripemd160
+
+from coincurve.keys import (
+    PrivateKey,
+    PublicKey)
+
+
+def BIP32Hash(chaincode: bytes, child_no: int, key_data_type: int, keydata: bytes):
+    return hmac_sha512(chaincode, key_data_type.to_bytes(1) + keydata + child_no.to_bytes(4, 'big'))
+
+
+def hash160_dcr(data: bytes) -> bytes:
+    return ripemd160(blake256(data))
+
+
+class ExtKeyPair():
+    __slots__ = ('_depth', '_fingerprint', '_child_no', '_chaincode', '_key', '_pubkey', 'hash_func')
+
+    def __init__(self, coin_type=1):
+        if coin_type == 4:
+            self.hash_func = hash160_dcr
+        else:
+            self.hash_func = hash160
+
+    def set_seed(self, seed: bytes) -> None:
+        hashout: bytes = hmac_sha512(b'Bitcoin seed', seed)
+        self._key = hashout[:32]
+        self._pubkey = None
+        self._chaincode = hashout[32:]
+        self._depth = 0
+        self._child_no = 0
+        self._fingerprint = b'\0' * 4
+
+    def has_key(self) -> bool:
+        return False if self._key is None else True
+
+    def neuter(self) -> None:
+        if self._key is None:
+            raise ValueError('Already neutered')
+        self._pubkey = PublicKey.from_secret(self._key).format()
+        self._key = None
+
+    def derive(self, child_no: int):
+        out = ExtKeyPair()
+        out._depth = self._depth + 1
+        out._child_no = child_no
+
+        if (child_no >> 31) == 0:
+            if self._key:
+                K = PublicKey.from_secret(self._key)
+                k_encoded = K.format()
+            else:
+                K = PublicKey(self._pubkey)
+                k_encoded = self._pubkey
+            out._fingerprint = self.hash_func(k_encoded)[:4]
+            new_hash = BIP32Hash(self._chaincode, child_no, k_encoded[0], k_encoded[1:])
+            out._chaincode = new_hash[32:]
+
+            if self._key:
+                k = PrivateKey(self._key)
+                k.add(new_hash[:32], update=True)
+                out._key = k.secret
+                out._pubkey = None
+            else:
+                K.add(new_hash[:32], update=True)
+                out._key = None
+                out._pubkey = K.format()
+        else:
+            k = PrivateKey(self._key)
+            out._fingerprint = self.hash_func(self._pubkey if self._pubkey else PublicKey.from_secret(self._key).format())[:4]
+            new_hash = BIP32Hash(self._chaincode, child_no, 0, self._key)
+            out._chaincode = new_hash[32:]
+            k.add(new_hash[:32], update=True)
+            out._key = k.secret
+            out._pubkey = None
+
+        out.hash_func = self.hash_func
+        return out
+
+    def encode_v(self) -> bytes:
+        return self._depth.to_bytes(1) + \
+            self._fingerprint + \
+            self._child_no.to_bytes(4, 'big') + \
+            self._chaincode + \
+            b'\x00' + \
+            self._key
+
+    def encode_p(self) -> bytes:
+        pubkey = PublicKey.from_secret(self._key).format() if self._pubkey is None else self._pubkey
+        return self._depth.to_bytes(1) + \
+            self._fingerprint + \
+            self._child_no.to_bytes(4, 'big') + \
+            self._chaincode + \
+            pubkey
+
+    def decode(self, data: bytes) -> None:
+        if len(data) != 74:
+            raise ValueError('Unexpected extkey length')
+        self._depth = data[0]
+        self._fingerprint = data[1:5]
+        self._child_no = int.from_bytes(data[5:9], 'big')
+        self._chaincode = data[9:41]
+
+        if data[41] == 0:
+            self._key = data[42:]
+            self._pubkey = None
+        else:
+            self._key = None
+            self._pubkey = data[41:]

bin/basicswap_prepare.py

@@ -91,6 +91,8 @@ known_coins = {
 
 disabled_coins = [
     'navcoin',
+    'namecoin',  # Needs update
+    'decred',  # In-progress
 ]
 
 expected_key_ids = {

bin/basicswap_run.py

@@ -81,6 +81,7 @@ def startDaemon(node_dir, bin_dir, daemon_bin, opts=[], extra_config={}):
         args.append('-datadir=' + datadir_path)
     args += opts
     logging.info('Starting node ' + daemon_bin + ' ' + (('-datadir=' + node_dir) if add_datadir else ''))
+    logging.info('[rm] {}'.format(' '.join(args)))
 
     opened_files = []
     if extra_config.get('stdout_to_file', False):

tests/basicswap/extended/test_dcr.py

@@ -7,6 +7,8 @@
 
 import logging
 import os
+import subprocess
+import select
 import unittest
 
 import basicswap.config as cfg
@@ -14,6 +16,7 @@ import basicswap.config as cfg
 from basicswap.basicswap import (
     Coins,
 )
+from basicswap.util.crypto import hash160
 from basicswap.interface.dcr.rpc import (
     callrpc,
 )
@@ -38,6 +41,7 @@ DCR_CLI = os.getenv('DCR_CLI', 'dcrctl' + cfg.bin_suffix)
 
 DCR_BASE_PORT = 44932
 DCR_BASE_RPC_PORT = 45932
+DCR_BASE_WALLET_RPC_PORT = 45952
 
 
 def make_rpc_func(node_id, base_rpc_port):
@@ -50,28 +54,43 @@ def make_rpc_func(node_id, base_rpc_port):
     return rpc_func
 
 
-def prepareDCDDataDir(datadir, node_id, conf_file, dir_prefix, base_p2p_port, base_rpc_port, num_nodes=3):
+def prepareDCDDataDir(datadir, node_id, conf_file, dir_prefix, num_nodes=3):
     node_dir = os.path.join(datadir, dir_prefix + str(node_id))
     if not os.path.exists(node_dir):
         os.makedirs(node_dir)
     cfg_file_path = os.path.join(node_dir, conf_file)
     if os.path.exists(cfg_file_path):
         return
+    config = [
+        'simnet=1\n',
+        'debuglevel=debug\n',
+        f'listen=127.0.0.1:{DCR_BASE_PORT + node_id}\n',
+        f'rpclisten=127.0.0.1:{DCR_BASE_RPC_PORT + node_id}\n',
+        f'rpcuser=test{node_id}\n',
+        f'rpcpass=test_pass{node_id}\n',
+        'notls=1\n',]
+
+    for i in range(0, num_nodes):
+        if node_id == i:
+            continue
+        config.append('addpeer=127.0.0.1:{}\n'.format(DCR_BASE_PORT + i))
+
     with open(cfg_file_path, 'w+') as fp:
-        config = [
-            'regnet=1\n',  # or simnet?
-            'debuglevel=debug\n',
-            f'listen=127.0.0.1:{base_p2p_port + node_id}\n',
-            f'rpclisten=127.0.0.1:{base_rpc_port + node_id}\n',
-            f'rpcuser=test{node_id}\n',
-            f'rpcpass=test_pass{node_id}\n',
-            'notls=1\n',]
-
-        for i in range(0, num_nodes):
-            if node_id == i:
-                continue
-            config.append('addpeer=127.0.0.1:{}\n'.format(base_p2p_port + i))
+        for line in config:
+            fp.write(line)
 
+    config = [
+        'simnet=1\n',
+        'debuglevel=debug\n',
+        f'rpclisten=127.0.0.1:{DCR_BASE_WALLET_RPC_PORT + node_id}\n',
+        f'rpcconnect=127.0.0.1:{DCR_BASE_RPC_PORT + node_id}\n',
+        f'username=test{node_id}\n',
+        f'password=test_pass{node_id}\n',
+        'noservertls=1\n',
+        'noclienttls=1\n',]
+
+    wallet_cfg_file_path = os.path.join(node_dir, 'dcrwallet.conf')
+    with open(wallet_cfg_file_path, 'w+') as fp:
         for line in config:
             fp.write(line)
 
@@ -83,6 +102,12 @@ class Test(BaseTest):
     start_ltc_nodes = False
     start_xmr_nodes = False
 
+    hex_seeds = [
+        'e8574b2a94404ee62d8acc0258cab4c0defcfab8a5dfc2f4954c1f9d7e09d72a',
+        '10689fc6378e5f318b663560012673441dcdd8d796134e6021a4248cc6342cc6',
+        'efc96ffe4fee469407826841d9700ef0a0735b0aa5ec5e7a4aa9bc1afd9a9a30',  # Won't match main seed, as it's set randomly
+    ]
+
     @classmethod
     def prepareExtraCoins(cls):
         pass
@@ -103,7 +128,7 @@ class Test(BaseTest):
     def prepareExtraDataDir(cls, i):
         extra_opts = []
         if not cls.restore_instance:
-            data_dir = prepareDCDDataDir(cfg.TEST_DATADIRS, i, 'dcrd.conf', 'dcr_', base_p2p_port=DCR_BASE_PORT, base_rpc_port=DCR_BASE_RPC_PORT)
+            data_dir = prepareDCDDataDir(cfg.TEST_DATADIRS, i, 'dcrd.conf', 'dcr_')
 
         appdata = os.path.join(cfg.TEST_DATADIRS, 'dcr_' + str(i))
         datadir = os.path.join(appdata, 'data')
@@ -113,12 +138,52 @@ class Test(BaseTest):
 
         waitForRPC(make_rpc_func(i, base_rpc_port=DCR_BASE_RPC_PORT), test_delay_event, rpc_command='getnetworkinfo', max_tries=12)
 
+        logging.info('Creating wallet')
+        extra_opts.append('--pass=test_pass')
+        args = [os.path.join(DCR_BINDIR, DCR_WALLET), '--create'] + extra_opts
+        (pipe_r, pipe_w) = os.pipe()  # subprocess.PIPE is buffered, blocks when read
+        p = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=pipe_w, stderr=pipe_w)
+
+        try:
+            while p.poll() is None:
+                while len(select.select([pipe_r], [], [], 0)[0]) == 1:
+                    buf = os.read(pipe_r, 1024).decode('utf-8')
+                    response = None
+                    if 'Use the existing configured private passphrase' in buf:
+                        response = b'y\n'
+                    elif 'Do you want to add an additional layer of encryption' in buf:
+                        response = b'n\n'
+                    elif 'Do you have an existing wallet seed' in buf:
+                        response = b'y\n'
+                    elif 'Enter existing wallet seed' in buf:
+                        response = (cls.hex_seeds[i] + '\n').encode('utf-8')
+                    else:
+                        raise ValueError(f'Unexpected output: {buf}')
+                    if response is not None:
+                        p.stdin.write(response)
+                        p.stdin.flush()
+                test_delay_event.wait(0.1)
+        except Exception as e:
+            logging.error(f'{DCR_WALLET} --create failed: {e}')
+        finally:
+            if p.poll() is None:
+                p.terminate()
+            os.close(pipe_r)
+            os.close(pipe_w)
+            p.stdin.close()
+
+        cls.dcr_daemons.append(startDaemon(appdata, DCR_BINDIR, DCR_WALLET, opts=extra_opts, extra_config={'add_datadir': False, 'stdout_to_file': True, 'stdout_filename': 'dcrwallet_stdout.log'}))
+        logging.info('Started %s %d', DCR_WALLET, cls.dcr_daemons[-1].handle.pid)
+
+        waitForRPC(make_rpc_func(i, base_rpc_port=DCR_BASE_WALLET_RPC_PORT), test_delay_event, rpc_command='getinfo', max_tries=12)
+
     @classmethod
     def addCoinSettings(cls, settings, datadir, node_id):
         settings['chainclients']['decred'] = {
             'connection_type': 'rpc',
             'manage_daemon': False,
             'rpcport': DCR_BASE_RPC_PORT + node_id,
+            'walletrpcport': DCR_BASE_WALLET_RPC_PORT + node_id,
             'rpcuser': 'test' + str(node_id),
             'rpcpassword': 'test_pass' + str(node_id),
             'datadir': os.path.join(datadir, 'dcr_' + str(node_id)),
@@ -128,7 +193,7 @@ class Test(BaseTest):
             'blocks_confirmed': 1,
         }
 
-    def test_001_decred(self):
+    def test_0001_decred_address(self):
         logging.info('---------- Test {}'.format(self.test_coin_from.name))
 
         coin_settings = {'rpcport': 0, 'rpcauth': 'none'}
@@ -146,6 +211,26 @@ class Test(BaseTest):
         data = ci.decode_address(address)
         assert (data[2:] == pkh)
 
+    def test_001_segwit(self):
+        logging.info('---------- Test {} segwit'.format(self.test_coin_from.name))
+
+        swap_clients = self.swap_clients
+
+        ci = swap_clients[0].ci(self.test_coin_from)
+        assert (ci.using_segwit() is True)
+
+        for i, sc in enumerate(swap_clients):
+            loop_ci = sc.ci(self.test_coin_from)
+            root_key = sc.getWalletKey(Coins.DCR, 1)
+            masterpubkey = loop_ci.rpc_wallet('getmasterpubkey')
+            masterpubkey_data = loop_ci.decode_address(masterpubkey)[4:]
+
+            seed_hash = loop_ci.getSeedHash(root_key)
+            if i == 0:
+                assert (masterpubkey == 'spubVV1z2AFYjVZvzM45FSaWMPRqyUoUwyW78wfANdjdNG6JGCXrr8AbRvUgYb3Lm1iun9CgHew1KswdePryNLKEnBSQ82AjNpYdQgzXPUme9c6')
+            if i < 2:
+                assert (seed_hash == hash160(masterpubkey_data))
+
 
 if __name__ == '__main__':
     unittest.main()

tests/basicswap/test_other.py

@@ -23,8 +23,10 @@ from coincurve.keys import (
     PrivateKey)
 
 from basicswap.util import i2b, h2b
-from basicswap.util.integer import encode_varint, decode_varint
+from basicswap.util.address import decodeAddress
 from basicswap.util.crypto import ripemd160, hash160, blake256
+from basicswap.util.extkey import ExtKeyPair
+from basicswap.util.integer import encode_varint, decode_varint
 from basicswap.util.network import is_private_ip_address
 from basicswap.util.rfc2440 import rfc2440_hash_password
 from basicswap.util_xmr import encode_address as xmr_encode_address
@@ -312,7 +314,7 @@ class Test(unittest.TestCase):
         assert ('10.00000000' == format_amount(amount_to_recreate, scale_to))
 
         coin_settings = {'rpcport': 0, 'rpcauth': 'none', 'walletrpcport': 0, 'walletrpcauth': 'none'}
-        coin_settings.update(self.REQUIRED_SETTINGS)
+        coin_settings.update(REQUIRED_SETTINGS)
         ci_xmr = XMRInterface(coin_settings, 'regtest')
         ci_btc = BTCInterface(coin_settings, 'regtest')
 
@@ -480,6 +482,37 @@ class Test(unittest.TestCase):
         for expect_hash, data in test_vectors:
             assert (blake256(data).hex() == expect_hash)
 
+    def test_extkey(self):
+
+        test_key = 'XPARHAr37YxmFP8wyjkaHAQWmp84GiyLikL7EL8j9BCx4LkB8Q1Bw5Kr8sA1GA3Ym53zNLcaxxFHr6u81JVTeCaD61c6fKS1YRAuti8Zu5SzJCjh'
+        test_key_c0 = 'XPARHAt1XMcNYAwP5wEnQXknBAkGSzaetdZt2eoJZehdB4WXfV1xbSjpgHe44AivmumcSejW5KaYx6L5M6MyR1WyXrsWTwaiUEfHq2RrqCfXj3ZW'
+        test_key_c0_p = 'PPARTKPL4rp5WLnrYP6jZfuRjx6jrmvbsz5QdHofPfFqJdm918mQwdPLq6Dd9TkdbQeKUqjbHWkyzWe7Pftd7itzm7ETEoUMq4cbG4fY9FKH1YSU'
+        test_key_c0h = 'XPARHAt1XMcNgWbv48LwoQbjs1bC8kCXKomzvJLRT5xmbQ2GKf9e8Vfr1MMcfiWJC34RyDp5HvAfjeiNyLDfkFm1UrRCrPkVC9GGaAWa3nXMWew8'
+
+        ek_data = decodeAddress(test_key)[4:]
+
+        ek = ExtKeyPair()
+        ek.decode(ek_data)
+        assert (ek.encode_v() == ek_data)
+
+        m_0 = ek.derive(0)
+
+        ek_c0_data = decodeAddress(test_key_c0)[4:]
+        assert (m_0.encode_v() == ek_c0_data)
+
+        child_no: int = 0 | (1 << 31)
+        m_0h = ek.derive(child_no)
+
+        ek_c0h_data = decodeAddress(test_key_c0h)[4:]
+        assert (m_0h.encode_v() == ek_c0h_data)
+
+        ek.neuter()
+        assert (ek.has_key() is False)
+        m_0 = ek.derive(0)
+
+        ek_c0_p_data = decodeAddress(test_key_c0_p)[4:]
+        assert (m_0.encode_p() == ek_c0_p_data)
+
 
 if __name__ == '__main__':
     unittest.main()