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.receiving_pubkeys   = v.get('receiving', [])
  29         self.change_pubkeys      = v.get('change', [])
  30         # addresses will not be stored on disk
  31         self.receiving_addresses = map(self.pubkeys_to_address, self.receiving_pubkeys)
  32         self.change_addresses    = map(self.pubkeys_to_address, self.change_pubkeys)
  33
  34     def dump(self):
  35         return {'receiving':self.receiving_pubkeys, 'change':self.change_pubkeys}
  36
  37     def get_pubkey(self, for_change, n):
  38         pubkeys_list = self.change_pubkeys if for_change else self.receiving_pubkeys
  39         return pubkeys_list[n]
  40
  41     def get_address(self, for_change, n):
  42         addr_list = self.change_addresses if for_change else self.receiving_addresses
  43         return addr_list[n]
  44
  45     def get_pubkeys(self, for_change, n):
  46         return [ self.get_pubkey(for_change, n)]
  47
  48     def get_addresses(self, for_change):
  49         addr_list = self.change_addresses if for_change else self.receiving_addresses
  50         return addr_list[:]
  51
  52     def derive_pubkeys(self, for_change, n):
  53         pass
  54
  55     def create_new_address(self, for_change):
  56         pubkeys_list = self.change_pubkeys if for_change else self.receiving_pubkeys
  57         addr_list = self.change_addresses if for_change else self.receiving_addresses
  58         n = len(pubkeys_list)
  59         pubkeys = self.derive_pubkeys(for_change, n)
  60         address = self.pubkeys_to_address(pubkeys)
  61         pubkeys_list.append(pubkeys)
  62         addr_list.append(address)
  63         print_msg(address)
  64         return address
  65
  66     def pubkeys_to_address(self, pubkey):
  67         return public_key_to_bc_address(pubkey.decode('hex'))
  68
  69     def has_change(self):
  70         return True
  71
  72     def get_name(self, k):
  73         return _('Main account')
  74
  75     def get_keyID(self, *sequence):
  76         pass
  77
  78     def redeem_script(self, *sequence):
  79         pass
  80
  81
  82 class PendingAccount(Account):
  83     def __init__(self, v):
  84         try:
  85             self.pending_pubkey = v['pending_pubkey']
  86         except:
  87             pass
  88
  89     def get_addresses(self, is_change):
  90         return []
  91
  92     def has_change(self):
  93         return False
  94
  95     def dump(self):
  96         return {} #{'pending_pubkey':self.pending_pubkey }
  97
  98     def get_name(self, k):
  99         return _('Pending account')
 100
 101     def get_master_pubkeys(self):
 102         return []
 103
 104 class ImportedAccount(Account):
 105     def __init__(self, d):
 106         self.keypairs = d['imported']
 107
 108     def get_addresses(self, for_change):
 109         return [] if for_change else sorted(self.keypairs.keys())
 110
 111     def get_pubkey(self, *sequence):
 112         for_change, i = sequence
 113         assert for_change == 0
 114         addr = self.get_addresses(0)[i]
 115         return self.keypairs[addr][0]
 116
 117     def get_xpubkeys(self, for_change, n):
 118         return self.get_pubkeys(for_change, n)
 119
 120     def get_private_key(self, sequence, wallet, password):
 121         from wallet import pw_decode
 122         for_change, i = sequence
 123         assert for_change == 0
 124         address = self.get_addresses(0)[i]
 125         pk = pw_decode(self.keypairs[address][1], password)
 126         # this checks the password
 127         assert address == address_from_private_key(pk)
 128         return [pk]
 129
 130     def has_change(self):
 131         return False
 132
 133     def add(self, address, pubkey, privkey, password):
 134         from wallet import pw_encode
 135         self.keypairs[address] = (pubkey, pw_encode(privkey, password ))
 136
 137     def remove(self, address):
 138         self.keypairs.pop(address)
 139
 140     def dump(self):
 141         return {'imported':self.keypairs}
 142
 143     def get_name(self, k):
 144         return _('Imported keys')
 145
 146
 147     def update_password(self, old_password, new_password):
 148         for k, v in self.keypairs.items():
 149             pubkey, a = v
 150             b = pw_decode(a, old_password)
 151             c = pw_encode(b, new_password)
 152             self.keypairs[k] = (pubkey, c)
 153
 154
 155 class OldAccount(Account):
 156     """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 157
 158     def __init__(self, v):
 159         Account.__init__(self, v)
 160         self.mpk = v['mpk'].decode('hex')
 161
 162
 163     @classmethod
 164     def mpk_from_seed(klass, seed):
 165         curve = SECP256k1
 166         secexp = klass.stretch_key(seed)
 167         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 168         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
 169         return master_public_key
 170
 171     @classmethod
 172     def stretch_key(self,seed):
 173         oldseed = seed
 174         for i in range(100000):
 175             seed = hashlib.sha256(seed + oldseed).digest()
 176         return string_to_number( seed )
 177
 178     @classmethod
 179     def get_sequence(self, mpk, for_change, n):
 180         return string_to_number( Hash( "%d:%d:"%(n,for_change) + mpk ) )
 181
 182     def get_address(self, for_change, n):
 183         pubkey = self.get_pubkey(for_change, n)
 184         address = public_key_to_bc_address( pubkey.decode('hex') )
 185         return address
 186
 187     @classmethod
 188     def get_pubkey_from_mpk(self, mpk, for_change, n):
 189         curve = SECP256k1
 190         z = self.get_sequence(mpk, for_change, n)
 191         master_public_key = ecdsa.VerifyingKey.from_string( mpk, curve = SECP256k1 )
 192         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 193         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 194         return '04' + public_key2.to_string().encode('hex')
 195
 196     def derive_pubkeys(self, for_change, n):
 197         return self.get_pubkey_from_mpk(self.mpk, for_change, n)
 198
 199     def get_private_key_from_stretched_exponent(self, for_change, n, secexp):
 200         order = generator_secp256k1.order()
 201         secexp = ( secexp + self.get_sequence(self.mpk, for_change, n) ) % order
 202         pk = number_to_string( secexp, generator_secp256k1.order() )
 203         compressed = False
 204         return SecretToASecret( pk, compressed )
 205
 206
 207     def get_private_key(self, sequence, wallet, password):
 208         seed = wallet.get_seed(password)
 209         self.check_seed(seed)
 210         for_change, n = sequence
 211         secexp = self.stretch_key(seed)
 212         pk = self.get_private_key_from_stretched_exponent(for_change, n, secexp)
 213         return [pk]
 214
 215
 216     def check_seed(self, seed):
 217         curve = SECP256k1
 218         secexp = self.stretch_key(seed)
 219         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 220         master_public_key = master_private_key.get_verifying_key().to_string()
 221         if master_public_key != self.mpk:
 222             print_error('invalid password (mpk)', self.mpk.encode('hex'), master_public_key.encode('hex'))
 223             raise Exception('Invalid password')
 224         return True
 225
 226     def redeem_script(self, sequence):
 227         return None
 228
 229     def get_master_pubkeys(self):
 230         return [self.mpk.encode('hex')]
 231
 232     def get_type(self):
 233         return _('Old Electrum format')
 234
 235     def get_xpubkeys(self, sequence):
 236         s = ''.join(map(lambda x: bitcoin.int_to_hex(x,2), sequence))
 237         mpk = self.mpk.encode('hex')
 238         x_pubkey = 'fe' + mpk + s
 239         return [ x_pubkey ]
 240
 241     @classmethod
 242     def parse_xpubkey(self, x_pubkey):
 243         assert is_extended_pubkey(x_pubkey)
 244         pk = x_pubkey[2:]
 245         mpk = pk[0:128]
 246         dd = pk[128:]
 247         s = []
 248         while dd:
 249             n = int(bitcoin.rev_hex(dd[0:4]), 16)
 250             dd = dd[4:]
 251             s.append(n)
 252         assert len(s) == 2
 253         return mpk, s
 254
 255
 256 class BIP32_Account(Account):
 257
 258     def __init__(self, v):
 259         Account.__init__(self, v)
 260         self.xpub = v['xpub']
 261
 262     def dump(self):
 263         d = Account.dump(self)
 264         d['xpub'] = self.xpub
 265         return d
 266
 267     def first_address(self):
 268         return self.get_address(0,0)
 269
 270     def get_master_pubkeys(self):
 271         return [self.xpub]
 272
 273     @classmethod
 274     def derive_pubkey_from_xpub(self, xpub, for_change, n):
 275         _, _, _, c, cK = deserialize_xkey(xpub)
 276         for i in [for_change, n]:
 277             cK, c = CKD_pub(cK, c, i)
 278         return cK.encode('hex')
 279
 280     def get_pubkey_from_xpub(self, xpub, for_change, n):
 281         xpubs = self.get_master_pubkeys()
 282         i = xpubs.index(xpub)
 283         pubkeys = self.get_pubkeys(sequence, n)
 284         return pubkeys[i]
 285
 286     def derive_pubkeys(self, for_change, n):
 287         return self.derive_pubkey_from_xpub(self.xpub, for_change, n)
 288
 289
 290     def get_private_key(self, sequence, wallet, password):
 291         out = []
 292         xpubs = self.get_master_pubkeys()
 293         roots = [k for k, v in wallet.master_public_keys.iteritems() if v in xpubs]
 294         for root in roots:
 295             xpriv = wallet.get_master_private_key(root, password)
 296             if not xpriv:
 297                 continue
 298             _, _, _, c, k = deserialize_xkey(xpriv)
 299             pk = bip32_private_key( sequence, k, c )
 300             out.append(pk)
 301         return out
 302
 303     def redeem_script(self, sequence):
 304         return None
 305
 306     def get_type(self):
 307         return _('Standard 1 of 1')
 308
 309     def get_xpubkeys(self, for_change, n):
 310         # unsorted
 311         s = ''.join(map(lambda x: bitcoin.int_to_hex(x,2), (for_change,n)))
 312         xpubs = self.get_master_pubkeys()
 313         return map(lambda xpub: 'ff' + bitcoin.DecodeBase58Check(xpub).encode('hex') + s, xpubs)
 314
 315     @classmethod
 316     def parse_xpubkey(self, pubkey):
 317         assert is_extended_pubkey(pubkey)
 318         pk = pubkey.decode('hex')
 319         pk = pk[1:]
 320         xkey = bitcoin.EncodeBase58Check(pk[0:78])
 321         dd = pk[78:]
 322         s = []
 323         while dd:
 324             n = int( bitcoin.rev_hex(dd[0:2].encode('hex')), 16)
 325             dd = dd[2:]
 326             s.append(n)
 327         assert len(s) == 2
 328         return xkey, s
 329
 330
 331     def get_name(self, k):
 332         name = "Unnamed account"
 333         m = re.match("m/(\d+)'", k)
 334         if m:
 335             num = m.group(1)
 336             if num == '0':
 337                 name = "Main account"
 338             else:
 339                 name = "Account %s"%num
 340
 341         return name
 342
 343
 344
 345 class BIP32_Account_2of2(BIP32_Account):
 346
 347     def __init__(self, v):
 348         BIP32_Account.__init__(self, v)
 349         self.xpub2 = v['xpub2']
 350
 351     def dump(self):
 352         d = BIP32_Account.dump(self)
 353         d['xpub2'] = self.xpub2
 354         return d
 355
 356     def get_pubkeys(self, for_change, n):
 357         return self.get_pubkey(for_change, n)
 358
 359     def derive_pubkeys(self, for_change, n):
 360         return map(lambda x: self.derive_pubkey_from_xpub(x, for_change, n), self.get_master_pubkeys())
 361
 362     def redeem_script(self, for_change, n):
 363         pubkeys = self.get_pubkeys(for_change, n)
 364         return Transaction.multisig_script(sorted(pubkeys), 2)
 365
 366     def pubkeys_to_address(self, pubkeys):
 367         redeem_script = Transaction.multisig_script(sorted(pubkeys), 2)
 368         address = hash_160_to_bc_address(hash_160(redeem_script.decode('hex')), 5)
 369         return address
 370
 371     def get_address(self, for_change, n):
 372         return self.pubkeys_to_address(self.get_pubkeys(for_change, n))
 373
 374     def get_master_pubkeys(self):
 375         return [self.xpub, self.xpub2]
 376
 377     def get_type(self):
 378         return _('Multisig 2 of 2')
 379
 380
 381 class BIP32_Account_2of3(BIP32_Account_2of2):
 382
 383     def __init__(self, v):
 384         BIP32_Account_2of2.__init__(self, v)
 385         self.xpub3 = v['xpub3']
 386
 387     def dump(self):
 388         d = BIP32_Account_2of2.dump(self)
 389         d['xpub3'] = self.xpub3
 390         return d
 391
 392     def get_master_pubkeys(self):
 393         return [self.xpub, self.xpub2, self.xpub3]
 394
 395     def get_type(self):
 396         return _('Multisig 2 of 3')
 397
 398
 399
 400