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