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#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2013 thomasv@gitorious
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import bitcoin
from bitcoin import *
from i18n import _
from transaction import Transaction, is_extended_pubkey
from util import print_msg, InvalidPassword
class Account(object):
def __init__(self, v):
self.receiving_pubkeys = v.get('receiving', [])
self.change_pubkeys = v.get('change', [])
# addresses will not be stored on disk
self.receiving_addresses = map(self.pubkeys_to_address, self.receiving_pubkeys)
self.change_addresses = map(self.pubkeys_to_address, self.change_pubkeys)
def dump(self):
return {'receiving':self.receiving_pubkeys, 'change':self.change_pubkeys}
def get_pubkey(self, for_change, n):
pubkeys_list = self.change_pubkeys if for_change else self.receiving_pubkeys
return pubkeys_list[n]
def get_address(self, for_change, n):
addr_list = self.change_addresses if for_change else self.receiving_addresses
return addr_list[n]
def get_pubkeys(self, for_change, n):
return [ self.get_pubkey(for_change, n)]
def get_addresses(self, for_change):
addr_list = self.change_addresses if for_change else self.receiving_addresses
return addr_list[:]
def derive_pubkeys(self, for_change, n):
pass
def create_new_address(self, for_change):
pubkeys_list = self.change_pubkeys if for_change else self.receiving_pubkeys
addr_list = self.change_addresses if for_change else self.receiving_addresses
n = len(pubkeys_list)
pubkeys = self.derive_pubkeys(for_change, n)
address = self.pubkeys_to_address(pubkeys)
pubkeys_list.append(pubkeys)
addr_list.append(address)
print_msg(address)
return address
def pubkeys_to_address(self, pubkey):
return public_key_to_bc_address(pubkey.decode('hex'))
def has_change(self):
return True
def get_name(self, k):
return _('Main account')
def redeem_script(self, for_change, n):
return None
def synchronize_sequence(self, wallet, for_change):
limit = wallet.gap_limit_for_change if for_change else wallet.gap_limit
while True:
addresses = self.get_addresses(for_change)
if len(addresses) < limit:
address = self.create_new_address(for_change)
wallet.add_address(address)
continue
if map( lambda a: wallet.address_is_old(a), addresses[-limit:] ) == limit*[False]:
break
else:
address = self.create_new_address(for_change)
wallet.add_address(address)
def synchronize(self, wallet):
self.synchronize_sequence(wallet, False)
self.synchronize_sequence(wallet, True)
class PendingAccount(Account):
def __init__(self, v):
self.pending_address = v['address']
self.change_pubkeys = []
self.receiving_pubkeys = [ v['pubkey'] ]
def synchronize(self, wallet):
return
def get_addresses(self, is_change):
return [] if is_change else [self.pending_address]
def has_change(self):
return False
def dump(self):
return {'pending':True, 'address':self.pending_address, 'pubkey':self.receiving_pubkeys[0] }
def get_name(self, k):
return _('Pending account')
def get_master_pubkeys(self):
return []
def get_type(self):
return _('pending')
def get_xpubkeys(self, for_change, n):
return self.get_pubkeys(for_change, n)
class ImportedAccount(Account):
def __init__(self, d):
self.keypairs = d['imported']
def synchronize(self, wallet):
return
def get_addresses(self, for_change):
return [] if for_change else sorted(self.keypairs.keys())
def get_pubkey(self, *sequence):
for_change, i = sequence
assert for_change == 0
addr = self.get_addresses(0)[i]
return self.keypairs[addr][0]
def get_xpubkeys(self, for_change, n):
return self.get_pubkeys(for_change, n)
def get_private_key(self, sequence, wallet, password):
from wallet import pw_decode
for_change, i = sequence
assert for_change == 0
address = self.get_addresses(0)[i]
pk = pw_decode(self.keypairs[address][1], password)
# this checks the password
if address != address_from_private_key(pk):
raise InvalidPassword()
return [pk]
def has_change(self):
return False
def add(self, address, pubkey, privkey, password):
from wallet import pw_encode
self.keypairs[address] = (pubkey, pw_encode(privkey, password ))
def remove(self, address):
self.keypairs.pop(address)
def dump(self):
return {'imported':self.keypairs}
def get_name(self, k):
return _('Imported keys')
def update_password(self, old_password, new_password):
for k, v in self.keypairs.items():
pubkey, a = v
b = pw_decode(a, old_password)
c = pw_encode(b, new_password)
self.keypairs[k] = (pubkey, c)
class OldAccount(Account):
""" Privatekey(type,n) = Master_private_key + H(n|S|type) """
def __init__(self, v):
Account.__init__(self, v)
self.mpk = v['mpk'].decode('hex')
@classmethod
def mpk_from_seed(klass, seed):
secexp = klass.stretch_key(seed)
master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
return master_public_key
@classmethod
def stretch_key(self,seed):
oldseed = seed
for i in range(100000):
seed = hashlib.sha256(seed + oldseed).digest()
return string_to_number( seed )
@classmethod
def get_sequence(self, mpk, for_change, n):
return string_to_number( Hash( "%d:%d:"%(n,for_change) + mpk ) )
def get_address(self, for_change, n):
pubkey = self.get_pubkey(for_change, n)
address = public_key_to_bc_address( pubkey.decode('hex') )
return address
@classmethod
def get_pubkey_from_mpk(self, mpk, for_change, n):
z = self.get_sequence(mpk, for_change, n)
master_public_key = ecdsa.VerifyingKey.from_string(mpk, curve = SECP256k1)
pubkey_point = master_public_key.pubkey.point + z*SECP256k1.generator
public_key2 = ecdsa.VerifyingKey.from_public_point(pubkey_point, curve = SECP256k1)
return '04' + public_key2.to_string().encode('hex')
def derive_pubkeys(self, for_change, n):
return self.get_pubkey_from_mpk(self.mpk, for_change, n)
def get_private_key_from_stretched_exponent(self, for_change, n, secexp):
order = generator_secp256k1.order()
secexp = ( secexp + self.get_sequence(self.mpk, for_change, n) ) % order
pk = number_to_string( secexp, generator_secp256k1.order() )
compressed = False
return SecretToASecret( pk, compressed )
def get_private_key(self, sequence, wallet, password):
seed = wallet.get_seed(password)
self.check_seed(seed)
for_change, n = sequence
secexp = self.stretch_key(seed)
pk = self.get_private_key_from_stretched_exponent(for_change, n, secexp)
return [pk]
def check_seed(self, seed):
secexp = self.stretch_key(seed)
master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
master_public_key = master_private_key.get_verifying_key().to_string()
if master_public_key != self.mpk:
print_error('invalid password (mpk)', self.mpk.encode('hex'), master_public_key.encode('hex'))
raise InvalidPassword()
return True
def get_master_pubkeys(self):
return [self.mpk.encode('hex')]
def get_type(self):
return _('Old Electrum format')
def get_xpubkeys(self, for_change, n):
s = ''.join(map(lambda x: bitcoin.int_to_hex(x,2), (for_change, n)))
mpk = self.mpk.encode('hex')
x_pubkey = 'fe' + mpk + s
return [ x_pubkey ]
@classmethod
def parse_xpubkey(self, x_pubkey):
assert is_extended_pubkey(x_pubkey)
pk = x_pubkey[2:]
mpk = pk[0:128]
dd = pk[128:]
s = []
while dd:
n = int(bitcoin.rev_hex(dd[0:4]), 16)
dd = dd[4:]
s.append(n)
assert len(s) == 2
return mpk, s
class BIP32_Account(Account):
def __init__(self, v):
Account.__init__(self, v)
self.xpub = v['xpub']
self.xpub_receive = None
self.xpub_change = None
def dump(self):
d = Account.dump(self)
d['xpub'] = self.xpub
return d
def first_address(self):
pubkeys = self.derive_pubkeys(0, 0)
addr = self.pubkeys_to_address(pubkeys)
return addr, pubkeys
def get_master_pubkeys(self):
return [self.xpub]
@classmethod
def derive_pubkey_from_xpub(self, xpub, for_change, n):
_, _, _, c, cK = deserialize_xkey(xpub)
for i in [for_change, n]:
cK, c = CKD_pub(cK, c, i)
return cK.encode('hex')
def get_pubkey_from_xpub(self, xpub, for_change, n):
xpubs = self.get_master_pubkeys()
i = xpubs.index(xpub)
pubkeys = self.get_pubkeys(for_change, n)
return pubkeys[i]
def derive_pubkeys(self, for_change, n):
xpub = self.xpub_change if for_change else self.xpub_receive
if xpub is None:
xpub = bip32_public_derivation(self.xpub, "", "/%d"%for_change)
if for_change:
self.xpub_change = xpub
else:
self.xpub_receive = xpub
_, _, _, c, cK = deserialize_xkey(xpub)
cK, c = CKD_pub(cK, c, n)
result = cK.encode('hex')
return result
def get_private_key(self, sequence, wallet, password):
out = []
xpubs = self.get_master_pubkeys()
roots = [k for k, v in wallet.master_public_keys.iteritems() if v in xpubs]
for root in roots:
xpriv = wallet.get_master_private_key(root, password)
if not xpriv:
continue
_, _, _, c, k = deserialize_xkey(xpriv)
pk = bip32_private_key( sequence, k, c )
out.append(pk)
return out
def get_type(self):
return _('Standard 1 of 1')
def get_xpubkeys(self, for_change, n):
# unsorted
s = ''.join(map(lambda x: bitcoin.int_to_hex(x,2), (for_change,n)))
xpubs = self.get_master_pubkeys()
return map(lambda xpub: 'ff' + bitcoin.DecodeBase58Check(xpub).encode('hex') + s, xpubs)
@classmethod
def parse_xpubkey(self, pubkey):
assert is_extended_pubkey(pubkey)
pk = pubkey.decode('hex')
pk = pk[1:]
xkey = bitcoin.EncodeBase58Check(pk[0:78])
dd = pk[78:]
s = []
while dd:
n = int( bitcoin.rev_hex(dd[0:2].encode('hex')), 16)
dd = dd[2:]
s.append(n)
assert len(s) == 2
return xkey, s
def get_name(self, k):
return "Main account" if k == '0' else "Account " + k
class Multisig_Account(BIP32_Account):
def __init__(self, v):
self.m = v.get('m', 2)
Account.__init__(self, v)
self.xpub_list = v['xpubs']
def dump(self):
d = Account.dump(self)
d['xpubs'] = self.xpub_list
d['m'] = self.m
return d
def get_pubkeys(self, for_change, n):
return self.get_pubkey(for_change, n)
def derive_pubkeys(self, for_change, n):
return map(lambda x: self.derive_pubkey_from_xpub(x, for_change, n), self.get_master_pubkeys())
def redeem_script(self, for_change, n):
pubkeys = self.get_pubkeys(for_change, n)
return Transaction.multisig_script(sorted(pubkeys), self.m)
def pubkeys_to_address(self, pubkeys):
redeem_script = Transaction.multisig_script(sorted(pubkeys), self.m)
address = hash_160_to_bc_address(hash_160(redeem_script.decode('hex')), 5)
return address
def get_address(self, for_change, n):
return self.pubkeys_to_address(self.get_pubkeys(for_change, n))
def get_master_pubkeys(self):
return self.xpub_list
def get_type(self):
return _('Multisig %d of %d'%(self.m, len(self.xpub_list)))