lib/account.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2013 thomasv@gitorious
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
  18
  19 import bitcoin
  20 from bitcoin import *
  21 from i18n import _
  22 from transaction import Transaction, is_extended_pubkey
  23 from util import print_msg
  24
  25
  26 class Account(object):
  27     def __init__(self, v):
  28         self.addresses = v.get('0', [])
  29         self.change = v.get('1', [])
  30
  31     def dump(self):
  32         return {'0':self.addresses, '1':self.change}
  33
  34     def get_addresses(self, for_change):
  35         return self.change[:] if for_change else self.addresses[:]
  36
  37     def create_new_address(self, for_change):
  38         addresses = self.change if for_change else self.addresses
  39         n = len(addresses)
  40         address = self.get_address( for_change, n)
  41         addresses.append(address)
  42         print_msg(address)
  43         return address
  44
  45     def get_address(self, for_change, n):
  46         pass
  47
  48     def get_pubkeys(self, sequence):
  49         return [ self.get_pubkey( *sequence )]
  50
  51     def has_change(self):
  52         return True
  53
  54     def get_name(self, k):
  55         return _('Main account')
  56
  57     def get_keyID(self, *sequence):
  58         pass
  59
  60     def redeem_script(self, *sequence):
  61         pass
  62
  63
  64 class PendingAccount(Account):
  65     def __init__(self, v):
  66         self.addresses = [ v['pending'] ]
  67         self.change = []
  68
  69     def has_change(self):
  70         return False
  71
  72     def dump(self):
  73         return {'pending':self.addresses[0]}
  74
  75     def get_name(self, k):
  76         return _('Pending account')
  77
  78
  79 class ImportedAccount(Account):
  80     def __init__(self, d):
  81         self.keypairs = d['imported']
  82
  83     def get_addresses(self, for_change):
  84         return [] if for_change else sorted(self.keypairs.keys())
  85
  86     def get_pubkey(self, *sequence):
  87         for_change, i = sequence
  88         assert for_change == 0
  89         addr = self.get_addresses(0)[i]
  90         return self.keypairs[addr][0]
  91
  92     def get_private_key(self, sequence, wallet, password):
  93         from wallet import pw_decode
  94         for_change, i = sequence
  95         assert for_change == 0
  96         address = self.get_addresses(0)[i]
  97         pk = pw_decode(self.keypairs[address][1], password)
  98         # this checks the password
  99         assert address == address_from_private_key(pk)
 100         return [pk]
 101
 102     def has_change(self):
 103         return False
 104
 105     def add(self, address, pubkey, privkey, password):
 106         from wallet import pw_encode
 107         self.keypairs[address] = (pubkey, pw_encode(privkey, password ))
 108
 109     def remove(self, address):
 110         self.keypairs.pop(address)
 111
 112     def dump(self):
 113         return {'imported':self.keypairs}
 114
 115     def get_name(self, k):
 116         return _('Imported keys')
 117
 118
 119     def update_password(self, old_password, new_password):
 120         for k, v in self.keypairs.items():
 121             pubkey, a = v
 122             b = pw_decode(a, old_password)
 123             c = pw_encode(b, new_password)
 124             self.keypairs[k] = (pubkey, c)
 125
 126
 127 class OldAccount(Account):
 128     """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 129
 130     def __init__(self, v):
 131         self.addresses = v.get(0, [])
 132         self.change = v.get(1, [])
 133         self.mpk = v['mpk'].decode('hex')
 134
 135     def dump(self):
 136         return {0:self.addresses, 1:self.change}
 137
 138     @classmethod
 139     def mpk_from_seed(klass, seed):
 140         curve = SECP256k1
 141         secexp = klass.stretch_key(seed)
 142         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 143         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
 144         return master_public_key
 145
 146     @classmethod
 147     def stretch_key(self,seed):
 148         oldseed = seed
 149         for i in range(100000):
 150             seed = hashlib.sha256(seed + oldseed).digest()
 151         return string_to_number( seed )
 152
 153     @classmethod
 154     def get_sequence(self, mpk, for_change, n):
 155         return string_to_number( Hash( "%d:%d:"%(n,for_change) + mpk ) )
 156
 157     def get_address(self, for_change, n):
 158         pubkey = self.get_pubkey(for_change, n)
 159         address = public_key_to_bc_address( pubkey.decode('hex') )
 160         return address
 161
 162     @classmethod
 163     def get_pubkey_from_mpk(self, mpk, for_change, n):
 164         curve = SECP256k1
 165         z = self.get_sequence(mpk, for_change, n)
 166         master_public_key = ecdsa.VerifyingKey.from_string( mpk, curve = SECP256k1 )
 167         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 168         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 169         return '04' + public_key2.to_string().encode('hex')
 170
 171     def get_pubkey(self, for_change, n):
 172         return self.get_pubkey_from_mpk(self.mpk, for_change, n)
 173
 174     def get_private_key_from_stretched_exponent(self, for_change, n, secexp):
 175         order = generator_secp256k1.order()
 176         secexp = ( secexp + self.get_sequence(self.mpk, for_change, n) ) % order
 177         pk = number_to_string( secexp, generator_secp256k1.order() )
 178         compressed = False
 179         return SecretToASecret( pk, compressed )
 180
 181
 182     def get_private_key(self, sequence, wallet, password):
 183         seed = wallet.get_seed(password)
 184         self.check_seed(seed)
 185         for_change, n = sequence
 186         secexp = self.stretch_key(seed)
 187         pk = self.get_private_key_from_stretched_exponent(for_change, n, secexp)
 188         return [pk]
 189
 190
 191     def check_seed(self, seed):
 192         curve = SECP256k1
 193         secexp = self.stretch_key(seed)
 194         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 195         master_public_key = master_private_key.get_verifying_key().to_string()
 196         if master_public_key != self.mpk:
 197             print_error('invalid password (mpk)', self.mpk.encode('hex'), master_public_key.encode('hex'))
 198             raise Exception('Invalid password')
 199         return True
 200
 201     def redeem_script(self, sequence):
 202         return None
 203
 204     def get_master_pubkeys(self):
 205         return [self.mpk.encode('hex')]
 206
 207     def get_type(self):
 208         return _('Old Electrum format')
 209
 210     def get_keyID(self, sequence):
 211         a, b = sequence
 212         return 'old(%s,%d,%d)'%(self.mpk.encode('hex'),a,b)
 213
 214     def get_xpubkeys(self, sequence):
 215         s = ''.join(map(lambda x: bitcoin.int_to_hex(x,2), sequence))
 216         mpk = self.mpk.encode('hex')
 217         x_pubkey = 'fe' + mpk + s
 218         return [ x_pubkey ]
 219
 220     @classmethod
 221     def parse_xpubkey(self, x_pubkey):
 222         assert is_extended_pubkey(x_pubkey)
 223         pk = x_pubkey[2:]
 224         mpk = pk[0:128]
 225         dd = pk[128:]
 226         s = []
 227         while dd:
 228             n = int(bitcoin.rev_hex(dd[0:4]), 16)
 229             dd = dd[4:]
 230             s.append(n)
 231         assert len(s) == 2
 232         return mpk, s
 233
 234
 235 class BIP32_Account(Account):
 236
 237     def __init__(self, v):
 238         Account.__init__(self, v)
 239         self.xpub = v['xpub']
 240
 241     def dump(self):
 242         d = Account.dump(self)
 243         d['xpub'] = self.xpub
 244         return d
 245
 246     def get_address(self, for_change, n):
 247         pubkey = self.get_pubkey(for_change, n)
 248         address = public_key_to_bc_address( pubkey.decode('hex') )
 249         return address
 250
 251     def first_address(self):
 252         return self.get_address(0,0)
 253
 254     def get_master_pubkeys(self):
 255         return [self.xpub]
 256
 257     @classmethod
 258     def get_pubkey_from_x(self, xpub, for_change, n):
 259         _, _, _, c, cK = deserialize_xkey(xpub)
 260         for i in [for_change, n]:
 261             cK, c = CKD_pub(cK, c, i)
 262         return cK.encode('hex')
 263
 264     def get_pubkeys(self, sequence):
 265         return sorted(map(lambda x: self.get_pubkey_from_x(x, *sequence), self.get_master_pubkeys()))
 266
 267     def get_pubkey(self, for_change, n):
 268         return self.get_pubkeys((for_change, n))[0]
 269
 270
 271     def get_private_key(self, sequence, wallet, password):
 272         out = []
 273         xpubs = self.get_master_pubkeys()
 274         roots = [k for k, v in wallet.master_public_keys.iteritems() if v in xpubs]
 275         for root in roots:
 276             xpriv = wallet.get_master_private_key(root, password)
 277             if not xpriv:
 278                 continue
 279             _, _, _, c, k = deserialize_xkey(xpriv)
 280             pk = bip32_private_key( sequence, k, c )
 281             out.append(pk)
 282
 283         return out
 284
 285
 286     def redeem_script(self, sequence):
 287         return None
 288
 289     def get_type(self):
 290         return _('Standard 1 of 1')
 291
 292     def get_xpubkeys(self, sequence):
 293         s = ''.join(map(lambda x: bitcoin.int_to_hex(x,2), sequence))
 294         mpks = self.get_master_pubkeys()
 295         out = []
 296         for xpub in mpks:
 297             pubkey = self.get_pubkey_from_x(xpub, *sequence)
 298             x_pubkey = 'ff' + bitcoin.DecodeBase58Check(xpub).encode('hex') + s
 299             out.append( (pubkey, x_pubkey ) )
 300         # sort it, so that x_pubkeys are in the same order as pubkeys
 301         out.sort()
 302         return map(lambda x:x[1], out )
 303
 304     @classmethod
 305     def parse_xpubkey(self, pubkey):
 306         assert is_extended_pubkey(pubkey)
 307         pk = pubkey.decode('hex')
 308         pk = pk[1:]
 309         xkey = bitcoin.EncodeBase58Check(pk[0:78])
 310         dd = pk[78:]
 311         s = []
 312         while dd:
 313             n = int( bitcoin.rev_hex(dd[0:2].encode('hex')), 16)
 314             dd = dd[2:]
 315             s.append(n)
 316         assert len(s) == 2
 317         return xkey, s
 318
 319
 320     def get_name(self, k):
 321         name = "Unnamed account"
 322         m = re.match("m/(\d+)'", k)
 323         if m:
 324             num = m.group(1)
 325             if num == '0':
 326                 name = "Main account"
 327             else:
 328                 name = "Account %s"%num
 329
 330         return name
 331
 332
 333
 334 class BIP32_Account_2of2(BIP32_Account):
 335
 336     def __init__(self, v):
 337         BIP32_Account.__init__(self, v)
 338         self.xpub2 = v['xpub2']
 339
 340     def dump(self):
 341         d = BIP32_Account.dump(self)
 342         d['xpub2'] = self.xpub2
 343         return d
 344
 345     def redeem_script(self, sequence):
 346         pubkeys = self.get_pubkeys(sequence)
 347         return Transaction.multisig_script(pubkeys, 2)
 348
 349     def get_address(self, for_change, n):
 350         address = hash_160_to_bc_address(hash_160(self.redeem_script((for_change, n)).decode('hex')), 5)
 351         return address
 352
 353     def get_master_pubkeys(self):
 354         return [self.xpub, self.xpub2]
 355
 356     def get_type(self):
 357         return _('Multisig 2 of 2')
 358
 359
 360 class BIP32_Account_2of3(BIP32_Account_2of2):
 361
 362     def __init__(self, v):
 363         BIP32_Account_2of2.__init__(self, v)
 364         self.xpub3 = v['xpub3']
 365
 366     def dump(self):
 367         d = BIP32_Account_2of2.dump(self)
 368         d['xpub3'] = self.xpub3
 369         return d
 370
 371     def get_master_pubkeys(self):
 372         return [self.xpub, self.xpub2, self.xpub3]
 373
 374     def get_type(self):
 375         return _('Multisig 2 of 3')
 376
 377
 378
 379