electrum

Electrum Bitcoin wallet
git clone https://git.parazyd.org/electrum
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commit 508d8a798f7bf7605d3b220386e042e62882614d
parent 8feb2a7b672ce9075fadb056d1f2f5320376795b
Author: ThomasV <thomasv1@gmx.de>
Date:   Fri, 27 Jun 2014 16:23:29 +0200

Merge pull request #741 from chrisglass/clean-support-testnet

Made all bip32 primitives testnet compatible.
Diffstat:
Mlib/bitcoin.py | 59++++++++++++++++++++++++++++++++++++++++++++---------------
Mlib/tests/test_bitcoin.py | 39++++++++++++++++++++++++++++++++-------
2 files changed, 76 insertions(+), 22 deletions(-)

diff --git a/lib/bitcoin.py b/lib/bitcoin.py @@ -640,23 +640,50 @@ def _CKD_pub(cK, c, s): return cK_n, c_n +BITCOIN_HEADER_PRIV = "0488ade4" +BITCOIN_HEADER_PUB = "0488b21e" + +TESTNET_HEADER_PRIV = "04358394" +TESTNET_HEADER_PUB = "043587cf" + +BITCOIN_HEADERS = (BITCOIN_HEADER_PUB, BITCOIN_HEADER_PRIV) +TESTNET_HEADERS = (TESTNET_HEADER_PUB, TESTNET_HEADER_PRIV) + +def _get_headers(testnet): + """Returns the correct headers for either testnet or bitcoin, in the form + of a 2-tuple, like (public, private).""" + if testnet: + return TESTNET_HEADERS + else: + return BITCOIN_HEADERS + def deserialize_xkey(xkey): + xkey = DecodeBase58Check(xkey) assert len(xkey) == 78 - assert xkey[0:4].encode('hex') in ["0488ade4", "0488b21e"] + + xkey_header = xkey[0:4].encode('hex') + # Determine if the key is a bitcoin key or a testnet key. + if xkey_header in TESTNET_HEADERS: + head = TESTNET_HEADER_PRIV + elif xkey_header in BITCOIN_HEADERS: + head = BITCOIN_HEADER_PRIV + else: + raise Exception("Unknown xkey header: '%s'" % xkey_header) + depth = ord(xkey[4]) fingerprint = xkey[5:9] child_number = xkey[9:13] c = xkey[13:13+32] - if xkey[0:4].encode('hex') == "0488ade4": + if xkey[0:4].encode('hex') == head: K_or_k = xkey[13+33:] else: K_or_k = xkey[13+32:] return depth, fingerprint, child_number, c, K_or_k -def get_xkey_name(xkey): +def get_xkey_name(xkey, testnet=False): depth, fingerprint, child_number, c, K = deserialize_xkey(xkey) n = int(child_number.encode('hex'), 16) if n & BIP32_PRIME: @@ -671,27 +698,29 @@ def get_xkey_name(xkey): raise BaseException("xpub depth error") -def xpub_from_xprv(xprv): +def xpub_from_xprv(xprv, testnet=False): depth, fingerprint, child_number, c, k = deserialize_xkey(xprv) K, cK = get_pubkeys_from_secret(k) - xpub = "0488B21E".decode('hex') + chr(depth) + fingerprint + child_number + c + cK + header_pub, _ = _get_headers(testnet) + xpub = header_pub.decode('hex') + chr(depth) + fingerprint + child_number + c + cK return EncodeBase58Check(xpub) -def bip32_root(seed): +def bip32_root(seed, testnet=False): import hmac + header_pub, header_priv = _get_headers(testnet) seed = seed.decode('hex') I = hmac.new("Bitcoin seed", seed, hashlib.sha512).digest() master_k = I[0:32] master_c = I[32:] K, cK = get_pubkeys_from_secret(master_k) - xprv = ("0488ADE4" + "00" + "00000000" + "00000000").decode("hex") + master_c + chr(0) + master_k - xpub = ("0488B21E" + "00" + "00000000" + "00000000").decode("hex") + master_c + cK + xprv = (header_priv + "00" + "00000000" + "00000000").decode("hex") + master_c + chr(0) + master_k + xpub = (header_pub + "00" + "00000000" + "00000000").decode("hex") + master_c + cK return EncodeBase58Check(xprv), EncodeBase58Check(xpub) - -def bip32_private_derivation(xprv, branch, sequence): +def bip32_private_derivation(xprv, branch, sequence, testnet=False): + header_pub, header_priv = _get_headers(testnet) depth, fingerprint, child_number, c, k = deserialize_xkey(xprv) assert sequence.startswith(branch) sequence = sequence[len(branch):] @@ -706,13 +735,13 @@ def bip32_private_derivation(xprv, branch, sequence): fingerprint = hash_160(parent_cK)[0:4] child_number = ("%08X"%i).decode('hex') K, cK = get_pubkeys_from_secret(k) - xprv = "0488ADE4".decode('hex') + chr(depth) + fingerprint + child_number + c + chr(0) + k - xpub = "0488B21E".decode('hex') + chr(depth) + fingerprint + child_number + c + cK + xprv = header_priv.decode('hex') + chr(depth) + fingerprint + child_number + c + chr(0) + k + xpub = header_pub.decode('hex') + chr(depth) + fingerprint + child_number + c + cK return EncodeBase58Check(xprv), EncodeBase58Check(xpub) - -def bip32_public_derivation(xpub, branch, sequence): +def bip32_public_derivation(xpub, branch, sequence, testnet=False): + header_pub, _ = _get_headers(testnet) depth, fingerprint, child_number, c, cK = deserialize_xkey(xpub) assert sequence.startswith(branch) sequence = sequence[len(branch):] @@ -725,7 +754,7 @@ def bip32_public_derivation(xpub, branch, sequence): fingerprint = hash_160(parent_cK)[0:4] child_number = ("%08X"%i).decode('hex') - xpub = "0488B21E".decode('hex') + chr(depth) + fingerprint + child_number + c + cK + xpub = header_pub.decode('hex') + chr(depth) + fingerprint + child_number + c + cK return EncodeBase58Check(xpub) diff --git a/lib/tests/test_bitcoin.py b/lib/tests/test_bitcoin.py @@ -6,7 +6,7 @@ from lib.bitcoin import ( generator_secp256k1, point_to_ser, public_key_to_bc_address, EC_KEY, bip32_root, bip32_public_derivation, bip32_private_derivation, pw_encode, pw_decode, Hash, public_key_from_private_key, address_from_private_key, - is_valid, is_private_key, mnemonic_to_seed) + is_valid, is_private_key, mnemonic_to_seed, xpub_from_xprv) try: import ecdsa @@ -49,24 +49,33 @@ class Test_bitcoin(unittest.TestCase): def test_bip32(self): # see https://en.bitcoin.it/wiki/BIP_0032_TestVectors - xpub, xprv = self._do_test_bip32("000102030405060708090a0b0c0d0e0f", "m/0'/1/2'/2/1000000000") + xpub, xprv = self._do_test_bip32("000102030405060708090a0b0c0d0e0f", "m/0'/1/2'/2/1000000000", testnet=False) assert xpub == "xpub6H1LXWLaKsWFhvm6RVpEL9P4KfRZSW7abD2ttkWP3SSQvnyA8FSVqNTEcYFgJS2UaFcxupHiYkro49S8yGasTvXEYBVPamhGW6cFJodrTHy" assert xprv == "xprvA41z7zogVVwxVSgdKUHDy1SKmdb533PjDz7J6N6mV6uS3ze1ai8FHa8kmHScGpWmj4WggLyQjgPie1rFSruoUihUZREPSL39UNdE3BBDu76" - xpub, xprv = self._do_test_bip32("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542","m/0/2147483647'/1/2147483646'/2") + xpub, xprv = self._do_test_bip32("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542","m/0/2147483647'/1/2147483646'/2", testnet=False) assert xpub == "xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt" assert xprv == "xprvA2nrNbFZABcdryreWet9Ea4LvTJcGsqrMzxHx98MMrotbir7yrKCEXw7nadnHM8Dq38EGfSh6dqA9QWTyefMLEcBYJUuekgW4BYPJcr9E7j" - def _do_test_bip32(self, seed, sequence): - xprv, xpub = bip32_root(seed) + def test_bip32_testnet(self): + xpub, xprv = self._do_test_bip32("000102030405060708090a0b0c0d0e0f", "m/0'/1/2'/2/1000000000", testnet=True) + assert xpub == "tpubDHNy3kAG39ThyiwwsgoKY4iRenXDRtce8qdCFJZXPMCJg5dsCUHayp84raLTpvyiNA9sXPob5rgqkKvkN8S7MMyXbnEhGJMW64Cf4vFAoaF" + assert xprv == "tprv8kgvuL81tmn36Fv9z38j8f4K5m1HGZRjZY2QxnXDy5PuqbP6a5TzoKWCgTcGHBu66W3TgSbAu2yX6sPza5FkHmy564Sh6gmCPUNeUt4yj2x" + + xpub, xprv = self._do_test_bip32("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542","m/0/2147483647'/1/2147483646'/2", testnet=True) + assert xpub == "tpubDG9qJLc8hq8PMG7y4sQEodLSocEkfj4mGrUC75b7G76mDoqybcUXvmvRsruvLeF14mhixobZwZP6LwqeFePKU83Sv8ZnxWdHBb6VzE6zbvC" + assert xprv == "tprv8jTo9vZtZTSiTo6BBDjeQDgLEaipWPsrhYsQpZYoqqJNPKbCyDewkHJZhkoSHiWYCUf1Gm4TFzQxcG4D6s1J9Hsn4whDK7QYyHHokJeUuac" + + def _do_test_bip32(self, seed, sequence, testnet): + xprv, xpub = bip32_root(seed, testnet) assert sequence[0:2] == "m/" path = 'm' sequence = sequence[2:] for n in sequence.split('/'): child_path = path + '/' + n if n[-1] != "'": - xpub2 = bip32_public_derivation(xpub, path, child_path) - xprv, xpub = bip32_private_derivation(xprv, path, child_path) + xpub2 = bip32_public_derivation(xpub, path, child_path, testnet) + xprv, xpub = bip32_private_derivation(xprv, path, child_path, testnet) if n[-1] != "'": assert xpub == xpub2 path = child_path @@ -109,6 +118,22 @@ class Test_bitcoin(unittest.TestCase): result = Hash(payload) self.assertEqual(expected, result) + def test_xpub_from_xprv(self): + """We can derive the xpub key from a xprv.""" + # Taken from test vectors in https://en.bitcoin.it/wiki/BIP_0032_TestVectors + xpub = "xpub6H1LXWLaKsWFhvm6RVpEL9P4KfRZSW7abD2ttkWP3SSQvnyA8FSVqNTEcYFgJS2UaFcxupHiYkro49S8yGasTvXEYBVPamhGW6cFJodrTHy" + xprv = "xprvA41z7zogVVwxVSgdKUHDy1SKmdb533PjDz7J6N6mV6uS3ze1ai8FHa8kmHScGpWmj4WggLyQjgPie1rFSruoUihUZREPSL39UNdE3BBDu76" + + result = xpub_from_xprv(xprv) + self.assertEqual(result, xpub) + + def test_xpub_from_xprv_testnet(self): + """We can derive the xpub key from a xprv using testnet headers.""" + xpub = "tpubDHNy3kAG39ThyiwwsgoKY4iRenXDRtce8qdCFJZXPMCJg5dsCUHayp84raLTpvyiNA9sXPob5rgqkKvkN8S7MMyXbnEhGJMW64Cf4vFAoaF" + xprv = "tprv8kgvuL81tmn36Fv9z38j8f4K5m1HGZRjZY2QxnXDy5PuqbP6a5TzoKWCgTcGHBu66W3TgSbAu2yX6sPza5FkHmy564Sh6gmCPUNeUt4yj2x" + result = xpub_from_xprv(xprv, testnet=True) + self.assertEqual(result, xpub) + class Test_keyImport(unittest.TestCase): """ The keys used in this class are TEST keys from