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