Made all bip32 primitives testnet compatible.
This commit is contained in:
Chris Glass
parent
8feb2a7b67
commit
0ac02bf040
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@ -640,23 +640,54 @@ def _CKD_pub(cK, c, s):
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return cK_n, c_n
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BITCOIN_HEADERS = ["0488ade4", "0488b21e"]
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TESTNET_HEADERS = ["043587cf", "04358394"]
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BITCOIN_HEAD = "0488ade4"
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TESTNET_HEAD = "04358394"
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BITCOIN_HEADER_PRIV = "0488ADE4"
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BITCOIN_HEADER_PUB = "0488B21E"
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TESTNET_HEADER_PRIV = "04358394"
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TESTNET_HEADER_PUB = "043587CF"
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def _get_headers(testnet):
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"""Returns the correct headers for either testnet or bitcoin, in the form
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of a 2-tuple, like (public, private)."""
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if testnet:
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return (TESTNET_HEADER_PUB, TESTNET_HEADER_PRIV)
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else:
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return (BITCOIN_HEADER_PUB, BITCOIN_HEADER_PRIV)
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def deserialize_xkey(xkey):
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xkey = DecodeBase58Check(xkey)
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assert len(xkey) == 78
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assert xkey[0:4].encode('hex') in ["0488ade4", "0488b21e"]
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xkey_header = xkey[0:4].encode('hex')
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# Determine if the key is a bitcoin key or a testnet key.
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if xkey_header in TESTNET_HEADERS:
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head = TESTNET_HEAD
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elif xkey_header in BITCOIN_HEADERS:
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head = BITCOIN_HEAD
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else:
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raise Exception("Unknown xkey header: '%s'" % xkey_header)
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depth = ord(xkey[4])
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fingerprint = xkey[5:9]
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child_number = xkey[9:13]
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c = xkey[13:13+32]
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if xkey[0:4].encode('hex') == "0488ade4":
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if xkey[0:4].encode('hex') == head:
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K_or_k = xkey[13+33:]
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else:
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K_or_k = xkey[13+32:]
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return depth, fingerprint, child_number, c, K_or_k
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def get_xkey_name(xkey):
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def get_xkey_name(xkey, testnet=False):
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depth, fingerprint, child_number, c, K = deserialize_xkey(xkey)
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n = int(child_number.encode('hex'), 16)
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if n & BIP32_PRIME:
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@ -671,27 +702,29 @@ def get_xkey_name(xkey):
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raise BaseException("xpub depth error")
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def xpub_from_xprv(xprv):
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def xpub_from_xprv(xprv, testnet=False):
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depth, fingerprint, child_number, c, k = deserialize_xkey(xprv)
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K, cK = get_pubkeys_from_secret(k)
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xpub = "0488B21E".decode('hex') + chr(depth) + fingerprint + child_number + c + cK
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header_pub, _ = _get_headers(testnet)
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xpub = header_pub.decode('hex') + chr(depth) + fingerprint + child_number + c + cK
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return EncodeBase58Check(xpub)
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def bip32_root(seed):
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def bip32_root(seed, testnet=False):
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import hmac
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header_pub, header_priv = _get_headers(testnet)
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seed = seed.decode('hex')
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I = hmac.new("Bitcoin seed", seed, hashlib.sha512).digest()
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master_k = I[0:32]
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master_c = I[32:]
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K, cK = get_pubkeys_from_secret(master_k)
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xprv = ("0488ADE4" + "00" + "00000000" + "00000000").decode("hex") + master_c + chr(0) + master_k
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xpub = ("0488B21E" + "00" + "00000000" + "00000000").decode("hex") + master_c + cK
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xprv = (header_priv + "00" + "00000000" + "00000000").decode("hex") + master_c + chr(0) + master_k
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xpub = (header_pub + "00" + "00000000" + "00000000").decode("hex") + master_c + cK
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return EncodeBase58Check(xprv), EncodeBase58Check(xpub)
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def bip32_private_derivation(xprv, branch, sequence):
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def bip32_private_derivation(xprv, branch, sequence, testnet=False):
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header_pub, header_priv = _get_headers(testnet)
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depth, fingerprint, child_number, c, k = deserialize_xkey(xprv)
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assert sequence.startswith(branch)
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sequence = sequence[len(branch):]
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@ -706,13 +739,13 @@ def bip32_private_derivation(xprv, branch, sequence):
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fingerprint = hash_160(parent_cK)[0:4]
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child_number = ("%08X"%i).decode('hex')
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K, cK = get_pubkeys_from_secret(k)
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xprv = "0488ADE4".decode('hex') + chr(depth) + fingerprint + child_number + c + chr(0) + k
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xpub = "0488B21E".decode('hex') + chr(depth) + fingerprint + child_number + c + cK
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xprv = header_priv.decode('hex') + chr(depth) + fingerprint + child_number + c + chr(0) + k
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xpub = header_pub.decode('hex') + chr(depth) + fingerprint + child_number + c + cK
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return EncodeBase58Check(xprv), EncodeBase58Check(xpub)
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def bip32_public_derivation(xpub, branch, sequence):
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def bip32_public_derivation(xpub, branch, sequence, testnet=False):
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header_pub, _ = _get_headers(testnet)
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depth, fingerprint, child_number, c, cK = deserialize_xkey(xpub)
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assert sequence.startswith(branch)
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sequence = sequence[len(branch):]
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@ -725,7 +758,7 @@ def bip32_public_derivation(xpub, branch, sequence):
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fingerprint = hash_160(parent_cK)[0:4]
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child_number = ("%08X"%i).decode('hex')
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xpub = "0488B21E".decode('hex') + chr(depth) + fingerprint + child_number + c + cK
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xpub = header_pub.decode('hex') + chr(depth) + fingerprint + child_number + c + cK
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return EncodeBase58Check(xpub)
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@ -6,7 +6,7 @@ from lib.bitcoin import (
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generator_secp256k1, point_to_ser, public_key_to_bc_address, EC_KEY,
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bip32_root, bip32_public_derivation, bip32_private_derivation, pw_encode,
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pw_decode, Hash, public_key_from_private_key, address_from_private_key,
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is_valid, is_private_key, mnemonic_to_seed)
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is_valid, is_private_key, mnemonic_to_seed, xpub_from_xprv)
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try:
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import ecdsa
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@ -49,24 +49,33 @@ class Test_bitcoin(unittest.TestCase):
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def test_bip32(self):
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# see https://en.bitcoin.it/wiki/BIP_0032_TestVectors
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xpub, xprv = self._do_test_bip32("000102030405060708090a0b0c0d0e0f", "m/0'/1/2'/2/1000000000")
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xpub, xprv = self._do_test_bip32("000102030405060708090a0b0c0d0e0f", "m/0'/1/2'/2/1000000000", testnet=False)
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assert xpub == "xpub6H1LXWLaKsWFhvm6RVpEL9P4KfRZSW7abD2ttkWP3SSQvnyA8FSVqNTEcYFgJS2UaFcxupHiYkro49S8yGasTvXEYBVPamhGW6cFJodrTHy"
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assert xprv == "xprvA41z7zogVVwxVSgdKUHDy1SKmdb533PjDz7J6N6mV6uS3ze1ai8FHa8kmHScGpWmj4WggLyQjgPie1rFSruoUihUZREPSL39UNdE3BBDu76"
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xpub, xprv = self._do_test_bip32("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542","m/0/2147483647'/1/2147483646'/2")
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xpub, xprv = self._do_test_bip32("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542","m/0/2147483647'/1/2147483646'/2", testnet=False)
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assert xpub == "xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt"
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assert xprv == "xprvA2nrNbFZABcdryreWet9Ea4LvTJcGsqrMzxHx98MMrotbir7yrKCEXw7nadnHM8Dq38EGfSh6dqA9QWTyefMLEcBYJUuekgW4BYPJcr9E7j"
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def _do_test_bip32(self, seed, sequence):
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xprv, xpub = bip32_root(seed)
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def test_bip32_testnet(self):
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xpub, xprv = self._do_test_bip32("000102030405060708090a0b0c0d0e0f", "m/0'/1/2'/2/1000000000", testnet=True)
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assert xpub == "tpubDHNy3kAG39ThyiwwsgoKY4iRenXDRtce8qdCFJZXPMCJg5dsCUHayp84raLTpvyiNA9sXPob5rgqkKvkN8S7MMyXbnEhGJMW64Cf4vFAoaF"
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assert xprv == "tprv8kgvuL81tmn36Fv9z38j8f4K5m1HGZRjZY2QxnXDy5PuqbP6a5TzoKWCgTcGHBu66W3TgSbAu2yX6sPza5FkHmy564Sh6gmCPUNeUt4yj2x"
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xpub, xprv = self._do_test_bip32("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542","m/0/2147483647'/1/2147483646'/2", testnet=True)
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assert xpub == "tpubDG9qJLc8hq8PMG7y4sQEodLSocEkfj4mGrUC75b7G76mDoqybcUXvmvRsruvLeF14mhixobZwZP6LwqeFePKU83Sv8ZnxWdHBb6VzE6zbvC"
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assert xprv == "tprv8jTo9vZtZTSiTo6BBDjeQDgLEaipWPsrhYsQpZYoqqJNPKbCyDewkHJZhkoSHiWYCUf1Gm4TFzQxcG4D6s1J9Hsn4whDK7QYyHHokJeUuac"
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def _do_test_bip32(self, seed, sequence, testnet):
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xprv, xpub = bip32_root(seed, testnet)
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assert sequence[0:2] == "m/"
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path = 'm'
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sequence = sequence[2:]
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for n in sequence.split('/'):
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child_path = path + '/' + n
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if n[-1] != "'":
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xpub2 = bip32_public_derivation(xpub, path, child_path)
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xprv, xpub = bip32_private_derivation(xprv, path, child_path)
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xpub2 = bip32_public_derivation(xpub, path, child_path, testnet)
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xprv, xpub = bip32_private_derivation(xprv, path, child_path, testnet)
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if n[-1] != "'":
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assert xpub == xpub2
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path = child_path
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@ -109,6 +118,22 @@ class Test_bitcoin(unittest.TestCase):
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result = Hash(payload)
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self.assertEqual(expected, result)
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def test_xpub_from_xprv(self):
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"""We can derive the xpub key from a xprv."""
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# Taken from test vectors in https://en.bitcoin.it/wiki/BIP_0032_TestVectors
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xpub = "xpub6H1LXWLaKsWFhvm6RVpEL9P4KfRZSW7abD2ttkWP3SSQvnyA8FSVqNTEcYFgJS2UaFcxupHiYkro49S8yGasTvXEYBVPamhGW6cFJodrTHy"
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xprv = "xprvA41z7zogVVwxVSgdKUHDy1SKmdb533PjDz7J6N6mV6uS3ze1ai8FHa8kmHScGpWmj4WggLyQjgPie1rFSruoUihUZREPSL39UNdE3BBDu76"
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result = xpub_from_xprv(xprv)
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self.assertEqual(result, xpub)
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def test_xpub_from_xprv_testnet(self):
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"""We can derive the xpub key from a xprv using testnet headers."""
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xpub = "tpubDHNy3kAG39ThyiwwsgoKY4iRenXDRtce8qdCFJZXPMCJg5dsCUHayp84raLTpvyiNA9sXPob5rgqkKvkN8S7MMyXbnEhGJMW64Cf4vFAoaF"
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xprv = "tprv8kgvuL81tmn36Fv9z38j8f4K5m1HGZRjZY2QxnXDy5PuqbP6a5TzoKWCgTcGHBu66W3TgSbAu2yX6sPza5FkHmy564Sh6gmCPUNeUt4yj2x"
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result = xpub_from_xprv(xprv, testnet=True)
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self.assertEqual(result, xpub)
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class Test_keyImport(unittest.TestCase):
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""" The keys used in this class are TEST keys from
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