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 from bitcoin import *
  20 from i18n import _
  21 from transaction import Transaction
  22
  23
  24
  25 class Account(object):
  26     def __init__(self, v):
  27         self.addresses = v.get('0', [])
  28         self.change = v.get('1', [])
  29
  30     def dump(self):
  31         return {'0':self.addresses, '1':self.change}
  32
  33     def get_addresses(self, for_change):
  34         return self.change[:] if for_change else self.addresses[:]
  35
  36     def create_new_address(self, for_change):
  37         addresses = self.change if for_change else self.addresses
  38         n = len(addresses)
  39         address = self.get_address( for_change, n)
  40         addresses.append(address)
  41         print address
  42         return address
  43
  44     def get_address(self, for_change, n):
  45         pass
  46
  47     def get_pubkeys(self, sequence):
  48         return [ self.get_pubkey( *sequence )]
  49
  50     def has_change(self):
  51         return True
  52
  53     def get_name(self, k):
  54         return _('Main account')
  55
  56     def get_keyID(self, *sequence):
  57         pass
  58
  59     def redeem_script(self, *sequence):
  60         pass
  61
  62
  63 class PendingAccount(Account):
  64     def __init__(self, v):
  65         self.addresses = [ v['pending'] ]
  66         self.change = []
  67
  68     def has_change(self):
  69         return False
  70
  71     def dump(self):
  72         return {'pending':self.addresses[0]}
  73
  74     def get_name(self, k):
  75         return _('Pending account')
  76
  77
  78 class ImportedAccount(Account):
  79     def __init__(self, d):
  80         self.keypairs = d['imported']
  81
  82     def get_addresses(self, for_change):
  83         return [] if for_change else sorted(self.keypairs.keys())
  84
  85     def get_pubkey(self, *sequence):
  86         for_change, i = sequence
  87         assert for_change == 0
  88         addr = self.get_addresses(0)[i]
  89         return self.keypairs[addr][i][0]
  90
  91     def get_private_key(self, sequence, wallet, password):
  92         from wallet import pw_decode
  93         for_change, i = sequence
  94         assert for_change == 0
  95         address = self.get_addresses(0)[i]
  96         pk = pw_decode(self.keypairs[address][1], password)
  97         # this checks the password
  98         assert address == address_from_private_key(pk)
  99         return [pk]
 100
 101     def has_change(self):
 102         return False
 103
 104     def add(self, address, pubkey, privkey, password):
 105         from wallet import pw_encode
 106         self.keypairs[address] = (pubkey, pw_encode(privkey, password ))
 107
 108     def remove(self, address):
 109         self.keypairs.pop(address)
 110
 111     def dump(self):
 112         return {'imported':self.keypairs}
 113
 114     def get_name(self, k):
 115         return _('Imported keys')
 116
 117
 118     def update_password(self, old_password, new_password):
 119         for k, v in self.keypairs.items():
 120             pubkey, a = v
 121             b = pw_decode(a, old_password)
 122             c = pw_encode(b, new_password)
 123             self.keypairs[k] = (pubkey, c)
 124
 125
 126 class OldAccount(Account):
 127     """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 128
 129     def __init__(self, v):
 130         self.addresses = v.get(0, [])
 131         self.change = v.get(1, [])
 132         self.mpk = v['mpk'].decode('hex')
 133
 134     def dump(self):
 135         return {0:self.addresses, 1:self.change}
 136
 137     @classmethod
 138     def mpk_from_seed(klass, seed):
 139         curve = SECP256k1
 140         secexp = klass.stretch_key(seed)
 141         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 142         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
 143         return master_public_key
 144
 145     @classmethod
 146     def stretch_key(self,seed):
 147         oldseed = seed
 148         for i in range(100000):
 149             seed = hashlib.sha256(seed + oldseed).digest()
 150         return string_to_number( seed )
 151
 152     def get_sequence(self, for_change, n):
 153         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.mpk ) )
 154
 155     def get_address(self, for_change, n):
 156         pubkey = self.get_pubkey(for_change, n)
 157         address = public_key_to_bc_address( pubkey.decode('hex') )
 158         return address
 159
 160     def get_pubkey(self, for_change, n):
 161         curve = SECP256k1
 162         mpk = self.mpk
 163         z = self.get_sequence(for_change, n)
 164         master_public_key = ecdsa.VerifyingKey.from_string( mpk, curve = SECP256k1 )
 165         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 166         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 167         return '04' + public_key2.to_string().encode('hex')
 168
 169     def get_private_key_from_stretched_exponent(self, for_change, n, secexp):
 170         order = generator_secp256k1.order()
 171         secexp = ( secexp + self.get_sequence(for_change, n) ) % order
 172         pk = number_to_string( secexp, generator_secp256k1.order() )
 173         compressed = False
 174         return SecretToASecret( pk, compressed )
 175
 176
 177     def get_private_key(self, sequence, wallet, password):
 178         seed = wallet.get_seed(password)
 179         self.check_seed(seed)
 180         for_change, n = sequence
 181         secexp = self.stretch_key(seed)
 182         pk = self.get_private_key_from_stretched_exponent(for_change, n, secexp)
 183         return [pk]
 184
 185
 186     def check_seed(self, seed):
 187         curve = SECP256k1
 188         secexp = self.stretch_key(seed)
 189         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 190         master_public_key = master_private_key.get_verifying_key().to_string()
 191         if master_public_key != self.mpk:
 192             print_error('invalid password (mpk)', self.mpk.encode('hex'), master_public_key.encode('hex'))
 193             raise Exception('Invalid password')
 194         return True
 195
 196     def redeem_script(self, sequence):
 197         return None
 198
 199     def get_master_pubkeys(self):
 200         return [self.mpk]
 201
 202     def get_type(self):
 203         return _('Old Electrum format')
 204
 205     def get_keyID(self, sequence):
 206         a, b = sequence
 207         return 'old(%s,%d,%d)'%(self.mpk,a,b)
 208
 209
 210
 211 class BIP32_Account(Account):
 212
 213     def __init__(self, v):
 214         Account.__init__(self, v)
 215         self.xpub = v['xpub']
 216
 217     def dump(self):
 218         d = Account.dump(self)
 219         d['xpub'] = self.xpub
 220         return d
 221
 222     def get_address(self, for_change, n):
 223         pubkey = self.get_pubkey(for_change, n)
 224         address = public_key_to_bc_address( pubkey.decode('hex') )
 225         return address
 226
 227     def first_address(self):
 228         return self.get_address(0,0)
 229
 230     def get_master_pubkeys(self):
 231         return [self.xpub]
 232
 233     def get_pubkey_from_x(self, xpub, for_change, n):
 234         _, _, _, c, cK = deserialize_xkey(xpub)
 235         for i in [for_change, n]:
 236             cK, c = CKD_pub(cK, c, i)
 237         return cK.encode('hex')
 238
 239     def get_pubkeys(self, sequence):
 240         return sorted(map(lambda x: self.get_pubkey_from_x(x, *sequence), self.get_master_pubkeys()))
 241
 242     def get_pubkey(self, for_change, n):
 243         return self.get_pubkeys((for_change, n))[0]
 244
 245
 246     def get_private_key(self, sequence, wallet, password):
 247         out = []
 248         xpubs = self.get_master_pubkeys()
 249         roots = [k for k, v in wallet.master_public_keys.iteritems() if v in xpubs]
 250         for root in roots:
 251             xpriv = wallet.get_master_private_key(root, password)
 252             if not xpriv:
 253                 continue
 254             _, _, _, c, k = deserialize_xkey(xpriv)
 255             pk = bip32_private_key( sequence, k, c )
 256             out.append(pk)
 257
 258         return out
 259
 260
 261     def redeem_script(self, sequence):
 262         return None
 263
 264     def get_type(self):
 265         return _('Standard 1 of 1')
 266
 267     def get_keyID(self, sequence):
 268         s = '/' + '/'.join( map(lambda x:str(x), sequence) )
 269         return '&'.join( map(lambda x: 'bip32(%s,%s)'%(x, s), self.get_master_pubkeys() ) )
 270
 271     def get_name(self, k):
 272         name = "Unnamed account"
 273         m = re.match("m/(\d+)'", k)
 274         if m:
 275             num = m.group(1)
 276             if num == '0':
 277                 name = "Main account"
 278             else:
 279                 name = "Account %s"%num
 280
 281         return name
 282
 283
 284
 285 class BIP32_Account_2of2(BIP32_Account):
 286
 287     def __init__(self, v):
 288         BIP32_Account.__init__(self, v)
 289         self.xpub2 = v['xpub2']
 290
 291     def dump(self):
 292         d = BIP32_Account.dump(self)
 293         d['xpub2'] = self.xpub2
 294         return d
 295
 296     def redeem_script(self, sequence):
 297         pubkeys = self.get_pubkeys(sequence)
 298         return Transaction.multisig_script(pubkeys, 2)
 299
 300     def get_address(self, for_change, n):
 301         address = hash_160_to_bc_address(hash_160(self.redeem_script((for_change, n)).decode('hex')), 5)
 302         return address
 303
 304     def get_master_pubkeys(self):
 305         return [self.xpub, self.xpub2]
 306
 307     def get_type(self):
 308         return _('Multisig 2 of 2')
 309
 310
 311 class BIP32_Account_2of3(BIP32_Account_2of2):
 312
 313     def __init__(self, v):
 314         BIP32_Account_2of2.__init__(self, v)
 315         self.xpub3 = v['xpub3']
 316
 317     def dump(self):
 318         d = BIP32_Account_2of2.dump(self)
 319         d['xpub3'] = self.xpub3
 320         return d
 321
 322     def get_master_pubkeys(self):
 323         return [self.xpub, self.xpub2, self.xpub3]
 324
 325     def get_type(self):
 326         return _('Multisig 2 of 3')
 327
 328
 329
 330