def deserialize_xpriv(data): dbin = convert.b58check_to_bytes(data) assert dbin[0:4] == HD_HEADER_PRIVATE return { 'depth': dbin[4], 'fingerprint': dbin[5:9], 'i': convert.bytes_to_int(dbin[9:13]), 'chaincode': dbin[13:45], 'priv': ecdsa.deserialize_priv(dbin[46:78]) }
def derive_xpub(k, i): i = int(i) if i >= 2**31: raise Exception("Can't do private derivation on public key!") pub = k['pub'] pub_ser = ecdsa.serialize_pub(pub) hmacdata = pub_ser + convert.int_to_bytes(i, 4) I = hmac.new(k['chaincode'], hmacdata, hashlib.sha512).digest() return { 'depth': k['depth'] + 1, 'fingerprint': hashes.hash160(pub_ser)[:4], 'i': i, 'chaincode': I[32:], 'pub': ec.add(k['pub'], ecdsa.priv_to_pub(ecdsa.deserialize_priv(I[:32]))) }
def derive_xpriv(k, i): i = int(i) pub = ecdsa.priv_to_pub(k['priv']) pub_ser = ecdsa.serialize_pub(pub) priv_ser = ecdsa.serialize_priv(k['priv']) if i >= 2**31: hmacdata = b'\x00' + priv_ser + convert.int_to_bytes(i, 4) else: hmacdata = pub_ser + convert.int_to_bytes(i, 4) I = hmac.new(k['chaincode'], hmacdata, hashlib.sha512).digest() return { 'depth': k['depth'] + 1, 'fingerprint': hashes.hash160(pub_ser)[:4], 'i': i, 'chaincode': I[32:], 'priv': ec.add_scalar(k['priv'], ecdsa.deserialize_priv(I[:32])) }
def test_serialize(self): for _ in range(10): priv = ecdsa.random_priv() ser = ecdsa.serialize_priv(priv) priv2 = ecdsa.deserialize_priv(ser) self.assertEqual(priv, priv2)